"use client";

import Link from "next/link";
import { useEffect, useMemo, useRef, useState, type ReactNode } from "react";
import useSWR from "swr";
import { toast } from "sonner";
import { motion, AnimatePresence } from "framer-motion";
import {
  ArrowLeft,
  ChevronDown,
  ChevronRight,
  GripVertical,
  Image as ImageIcon,
  Layers,
  Loader2,
  MonitorPlay,
  Package,
  Plus,
  Save,
  Search,
  Settings2,
  Sparkles,
  Trash2,
  Upload,
  UserCircle,
  Video,
} from "lucide-react";
import {
  AGENT_WORKFLOW_MAX_TREE_DEPTH,
  countAgentWorkflowOptions,
  countAgentWorkflowOptionTree,
  countAgentWorkflowSteps,
  defaultAgentWorkflowUiConfig,
  findAgentWorkflowOptionByKey,
  findAgentWorkflowStepByKey,
  flattenAgentWorkflowOptionTree,
  getEnabledAgentWorkflowOptionTree,
  normalizeAgentWorkflowOptionOrdering,
  flattenAgentWorkflowSteps,
  normalizeAgentWorkflowStepOrdering,
  normalizeAgentWorkflowUiConfig,
} from "@/lib/agents/workflow-ui-config";
import {
  defaultAgentWorkflowBrandModelConfig,
  normalizeAgentWorkflowBrandModelConfig,
} from "@/lib/agents/workflow-brand-model-config";
import {
  AGENT_PRESET_LIBRARY_DEFAULT_SECTION_ID,
  AGENT_PRESET_LIBRARY_MAX_DEPTH,
  defaultAgentPresetLibraryConfig,
  normalizeAgentPresetLibraryConfig,
} from "@/lib/agents/preset-library-config";
import {
  defaultAgentWorkflowShowcaseConfig,
  normalizeAgentWorkflowShowcaseConfig,
} from "@/lib/agents/workflow-showcase-config";
import {
  defaultAgentWorkflowMaterialApiConfig,
  normalizeAgentWorkflowMaterialApiConfig,
} from "@/lib/agents/workflow-material-config";
import { fetchUploadWithRetry } from "@/lib/client/upload-with-retry";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { Switch } from "@/components/ui/switch";
import { Badge } from "@/components/ui/badge";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible";
import { Separator } from "@/components/ui/separator";
import { cn } from "@/lib/utils";
import type {
  AgentPresetLibraryCategoryNode,
  AgentPresetLibraryConfig,
  AgentPresetLibrarySection,
  AgentWorkflowBrandModelConfig,
  AgentWorkflowBrandStoreEntry,
  AgentWorkflowMaterialApiConfig,
  AgentWorkflowOptionUiConfig,
  AgentWorkflowShowcaseConfig,
  AgentWorkflowStepUiConfig,
  AgentWorkflowUiConfig,
} from "@/types/agent";

const fetcher = (url: string) => fetch(url, { cache: "no-store" }).then((res) => res.json());

// Animation variants
const containerVariants = {
  hidden: { opacity: 0 },
  visible: {
    opacity: 1,
    transition: { staggerChildren: 0.05 }
  }
};

const itemVariants = {
  hidden: { opacity: 0, y: 10 },
  visible: { opacity: 1, y: 0 }
};

const WORKFLOW_LEVEL_LABELS = ["一级模块", "二级模块", "三级模块"];
const WORKFLOW_OPTION_LEVEL_LABELS = ["一级卡片", "二级卡片", "三级卡片"];
const PRESET_LIBRARY_LEVEL_LABELS = ["一级分类", "二级分类", "三级分类"];

function normalizeConfigOrdering(config: AgentWorkflowUiConfig): AgentWorkflowUiConfig {
  return {
    ...config,
    steps: normalizeAgentWorkflowStepOrdering(config.steps),
  };
}

function createWorkflowSlug(value: string, fallback: string) {
  const normalized = value
    .trim()
    .replace(/\s+/g, "_")
    .replace(/[^\w-]/g, "_")
    .replace(/_+/g, "_")
    .replace(/^_+|_+$/g, "")
    .toLowerCase();
  return normalized || fallback;
}

function ensureUniqueWorkflowKey(baseKey: string, existingKeys: string[]) {
  const normalizedBase = createWorkflowSlug(baseKey, "item");
  const keySet = new Set(existingKeys);
  if (!keySet.has(normalizedBase)) {
    return normalizedBase;
  }

  let suffix = 2;
  let candidate = `${normalizedBase}_${suffix}`;
  while (keySet.has(candidate)) {
    suffix += 1;
    candidate = `${normalizedBase}_${suffix}`;
  }
  return candidate;
}

function createWorkflowOptionDraft(
  stepKey: string,
  optionIndex: number,
  existingOptionKeys: string[]
): AgentWorkflowOptionUiConfig {
  const optionKey = ensureUniqueWorkflowKey(
    `${stepKey}_option_${optionIndex + 1}`,
    existingOptionKeys
  );
  return {
    key: optionKey,
    buttonName: `选项${optionIndex + 1}`,
    description: "",
    previewImageUrl: "",
    enabled: true,
    sortOrder: optionIndex,
    promptFragment: `请按选项${optionIndex + 1}执行。`,
    children: [],
  };
}

function createWorkflowStepDraft(
  depth: number,
  stepIndex: number,
  existingStepKeys: string[]
): AgentWorkflowStepUiConfig {
  const levelLabel = WORKFLOW_LEVEL_LABELS[Math.max(0, Math.min(depth - 1, 2))] || "模块";
  const stepKey = ensureUniqueWorkflowKey(`step_${depth}_${stepIndex + 1}`, existingStepKeys);
  return {
    key: stepKey,
    title: `新${levelLabel}${stepIndex + 1}`,
    description: "",
    enabled: true,
    sortOrder: stepIndex,
    options: [createWorkflowOptionDraft(stepKey, 0, [])],
    children: [],
  };
}

function updateWorkflowStepTree(
  steps: AgentWorkflowStepUiConfig[],
  stepKey: string,
  updater: (step: AgentWorkflowStepUiConfig) => AgentWorkflowStepUiConfig
): AgentWorkflowStepUiConfig[] {
  return steps.map((step) => {
    if (step.key === stepKey) {
      return updater(step);
    }
    return {
      ...step,
      children: updateWorkflowStepTree(step.children || [], stepKey, updater),
    };
  });
}

function collectWorkflowOptionKeys(options: AgentWorkflowOptionUiConfig[]): string[] {
  return flattenAgentWorkflowOptionTree(options).map(({ option }) => option.key);
}

function updateWorkflowOptionTree(
  options: AgentWorkflowOptionUiConfig[],
  optionKey: string,
  updater: (option: AgentWorkflowOptionUiConfig) => AgentWorkflowOptionUiConfig
): AgentWorkflowOptionUiConfig[] {
  return options.map((option) => {
    if (option.key === optionKey) {
      return updater(option);
    }
    return {
      ...option,
      children: updateWorkflowOptionTree(option.children || [], optionKey, updater),
    };
  });
}

function removeWorkflowOptionTree(
  options: AgentWorkflowOptionUiConfig[],
  optionKey: string
): AgentWorkflowOptionUiConfig[] {
  return options
    .filter((option) => option.key !== optionKey)
    .map((option) => ({
      ...option,
      children: removeWorkflowOptionTree(option.children || [], optionKey),
    }));
}

function removeWorkflowStepTree(
  steps: AgentWorkflowStepUiConfig[],
  stepKey: string
): AgentWorkflowStepUiConfig[] {
  return steps
    .filter((step) => step.key !== stepKey)
    .map((step) => ({
      ...step,
      children: removeWorkflowStepTree(step.children || [], stepKey),
    }));
}

function collectWorkflowStepKeys(steps: AgentWorkflowStepUiConfig[]): string[] {
  return flattenAgentWorkflowSteps(steps).map(({ step }) => step.key);
}

function collectDescendantStepKeys(step: AgentWorkflowStepUiConfig): string[] {
  return [step.key, ...collectWorkflowStepKeys(step.children || [])];
}

function createPresetLibraryId(value: string, fallback: string) {
  const normalized = value
    .trim()
    .replace(/\s+/g, "_")
    .replace(/[^\w-]/g, "_")
    .replace(/_+/g, "_")
    .replace(/^_+|_+$/g, "")
    .toLowerCase();
  return normalized || fallback;
}

function ensureUniquePresetLibraryId(baseId: string, existingIds: string[]) {
  const normalizedBase = createPresetLibraryId(baseId, "item");
  const idSet = new Set(existingIds);
  if (!idSet.has(normalizedBase)) {
    return normalizedBase;
  }

  let suffix = 2;
  let candidate = `${normalizedBase}_${suffix}`;
  while (idSet.has(candidate)) {
    suffix += 1;
    candidate = `${normalizedBase}_${suffix}`;
  }
  return candidate;
}

function collectPresetLibraryNodeIds(
  nodes: AgentPresetLibraryCategoryNode[]
): string[] {
  return nodes.flatMap((node) => [node.id, ...collectPresetLibraryNodeIds(node.children || [])]);
}

function countPresetLibraryNodes(nodes: AgentPresetLibraryCategoryNode[]): number {
  return nodes.reduce(
    (total, node) => total + 1 + countPresetLibraryNodes(node.children || []),
    0
  );
}

function updatePresetLibraryNodeTree(
  nodes: AgentPresetLibraryCategoryNode[],
  nodeId: string,
  updater: (node: AgentPresetLibraryCategoryNode) => AgentPresetLibraryCategoryNode
): AgentPresetLibraryCategoryNode[] {
  return nodes.map((node) => {
    if (node.id === nodeId) {
      return updater(node);
    }

    return {
      ...node,
      children: updatePresetLibraryNodeTree(node.children || [], nodeId, updater),
    };
  });
}

function removePresetLibraryNodeTree(
  nodes: AgentPresetLibraryCategoryNode[],
  nodeId: string
): AgentPresetLibraryCategoryNode[] {
  return nodes
    .filter((node) => node.id !== nodeId)
    .map((node) => ({
      ...node,
      children: removePresetLibraryNodeTree(node.children || [], nodeId),
    }));
}

function findPresetLibraryNodeById(
  nodes: AgentPresetLibraryCategoryNode[],
  nodeId: string
): AgentPresetLibraryCategoryNode | null {
  for (const node of nodes) {
    if (node.id === nodeId) {
      return node;
    }
    const foundChild = findPresetLibraryNodeById(node.children || [], nodeId);
    if (foundChild) {
      return foundChild;
    }
  }
  return null;
}

function createPresetLibraryNodeDraft(
  depth: number,
  nodeIndex: number,
  existingIds: string[]
): AgentPresetLibraryCategoryNode {
  const levelLabel =
    PRESET_LIBRARY_LEVEL_LABELS[Math.max(0, Math.min(depth - 1, 2))] || "分类";
  return {
    id: ensureUniquePresetLibraryId(`category_${depth}_${nodeIndex + 1}`, existingIds),
    name: `新${levelLabel}${nodeIndex + 1}`,
    enabled: true,
    sortOrder: nodeIndex,
    children: [],
  };
}

function createPresetLibrarySectionDraft(
  sectionIndex: number,
  existingIds: string[]
): AgentPresetLibrarySection {
  const fallbackId =
    sectionIndex === 0 ? AGENT_PRESET_LIBRARY_DEFAULT_SECTION_ID : `section_${sectionIndex + 1}`;
  return {
    id: ensureUniquePresetLibraryId(fallbackId, existingIds),
    label: `分类页${sectionIndex + 1}`,
    description: "",
    enabled: true,
    sortOrder: sectionIndex,
    categories: [],
  };
}

function buildWorkflowInputOptionsFromBrandEntries(
  entries: AgentWorkflowBrandStoreEntry[]
) {
  const normalizedEntries = entries.map((entry, index) => ({
    brandName: entry.brandName.trim(),
    stores: Array.from(
      new Set(
        (entry.stores || [])
          .map((store) => store.trim())
          .filter(Boolean)
      )
    ),
    sortOrder: index,
  }));

  return {
    brandStoreEntries: normalizedEntries,
    brands: normalizedEntries.map((entry) => entry.brandName),
    stores: Array.from(new Set(normalizedEntries.flatMap((entry) => entry.stores))),
  };
}

interface AgentWorkflowSettingsClientProps {
  backHref?: string;
  backLabel?: string;
}

export function AgentWorkflowSettingsClient({
  backHref = "/settings",
  backLabel = "返回设置",
}: AgentWorkflowSettingsClientProps = {}) {
  const { data, isLoading, mutate } = useSWR<{
    agentPresetLibraryConfig?: AgentPresetLibraryConfig;
    agentWorkflowUiConfig?: AgentWorkflowUiConfig;
    agentWorkflowMaterialApiConfig?: AgentWorkflowMaterialApiConfig;
    agentWorkflowBrandModelConfig?: AgentWorkflowBrandModelConfig;
    agentWorkflowShowcaseConfig?: AgentWorkflowShowcaseConfig;
  }>("/api/site-settings", fetcher);
  const [presetLibraryConfig, setPresetLibraryConfig] = useState<AgentPresetLibraryConfig>(
    defaultAgentPresetLibraryConfig
  );
  const [config, setConfig] = useState<AgentWorkflowUiConfig>(defaultAgentWorkflowUiConfig);
  const [materialApiConfig, setMaterialApiConfig] = useState<AgentWorkflowMaterialApiConfig>(
    defaultAgentWorkflowMaterialApiConfig
  );
  const [showcaseConfig, setShowcaseConfig] = useState<AgentWorkflowShowcaseConfig>(
    defaultAgentWorkflowShowcaseConfig
  );
  const [brandModelConfig, setBrandModelConfig] = useState<AgentWorkflowBrandModelConfig>(
    defaultAgentWorkflowBrandModelConfig
  );
  const [isSaving, setIsSaving] = useState(false);
  const [uploadingKey, setUploadingKey] = useState<string | null>(null);
  const [expandedSteps, setExpandedSteps] = useState<Set<string>>(new Set());
  const [activeTab, setActiveTab] = useState("showcase");
  const [brandDraft, setBrandDraft] = useState("");
  const [storeDrafts, setStoreDrafts] = useState<Record<string, string>>({});
  const fileInputRefs = useRef<Record<string, HTMLInputElement | null>>({});

  useEffect(() => {
    if (!data) return;
    setPresetLibraryConfig(
      normalizeAgentPresetLibraryConfig(data.agentPresetLibraryConfig)
    );
    const normalizedUiConfig = normalizeAgentWorkflowUiConfig(data.agentWorkflowUiConfig);
    const flattenedUiConfig = normalizeConfigOrdering({
      ...normalizedUiConfig,
      steps: flattenAgentWorkflowSteps(normalizedUiConfig.steps).map(({ step }, index) => ({
        ...step,
        sortOrder: index,
        children: [],
      })),
    });
    setConfig(flattenedUiConfig);
    setMaterialApiConfig(
      normalizeAgentWorkflowMaterialApiConfig(data.agentWorkflowMaterialApiConfig)
    );
    setShowcaseConfig(
      normalizeAgentWorkflowShowcaseConfig(data.agentWorkflowShowcaseConfig)
    );
    setBrandModelConfig(
      normalizeAgentWorkflowBrandModelConfig(data.agentWorkflowBrandModelConfig)
    );
    if (flattenedUiConfig.steps[0]) {
      setExpandedSteps(new Set([flattenedUiConfig.steps[0].key]));
    }
  }, [data]);

  const brandStoreEntries = useMemo(
    () =>
      config.inputOptions?.brandStoreEntries ||
      defaultAgentWorkflowUiConfig.inputOptions?.brandStoreEntries ||
      [],
    [config.inputOptions?.brandStoreEntries]
  );
  const configuredBrands = useMemo(
    () => brandStoreEntries.map((entry) => entry.brandName),
    [brandStoreEntries]
  );
  const brandModelBrands = useMemo(() => {
    return Array.from(
      new Set([
        ...configuredBrands,
        ...brandModelConfig.entries.map((entry) => entry.brandName),
      ])
    ).sort((left, right) => left.localeCompare(right, "zh-CN"));
  }, [brandModelConfig.entries, configuredBrands]);

  const sortedSteps = useMemo(
    () => [...config.steps].sort((left, right) => left.sortOrder - right.sortOrder),
    [config.steps]
  );
  const sortedPresetLibrarySections = useMemo(
    () =>
      [...presetLibraryConfig.sections].sort((left, right) => left.sortOrder - right.sortOrder),
    [presetLibraryConfig.sections]
  );
  const updateInputOptions = (nextEntries: AgentWorkflowBrandStoreEntry[]) => {
    setConfig((prev) => ({
      ...prev,
      inputOptions: buildWorkflowInputOptionsFromBrandEntries(nextEntries),
    }));
  };

  const normalizeInputOptionValue = (value: string) =>
    value
      .replace(/\s+/g, " ")
      .trim();

  const handleAddBrandEntry = () => {
    const nextValue = normalizeInputOptionValue(brandDraft);
    if (!nextValue) {
      toast.error("请输入品牌名称");
      return;
    }

    if (brandStoreEntries.some((item) => item.brandName.toLowerCase() === nextValue.toLowerCase())) {
      toast.error("该品牌已存在");
      return;
    }

    updateInputOptions([
      ...brandStoreEntries,
      {
        brandName: nextValue,
        stores: [],
        sortOrder: brandStoreEntries.length,
      },
    ]);
    setBrandDraft("");
  };

  const handleRemoveBrandEntry = (brandName: string) => {
    updateInputOptions(brandStoreEntries.filter((entry) => entry.brandName !== brandName));
    setStoreDrafts((prev) => {
      const next = { ...prev };
      delete next[brandName];
      return next;
    });
  };

  const handleAddStoreToBrand = (brandName: string) => {
    const draft = storeDrafts[brandName] || "";
    const nextValue = normalizeInputOptionValue(draft);
    if (!nextValue) {
      toast.error("请输入店铺名称");
      return;
    }

    const targetEntry = brandStoreEntries.find((entry) => entry.brandName === brandName);
    if (targetEntry?.stores.some((store) => store.toLowerCase() === nextValue.toLowerCase())) {
      toast.error("该店铺已存在");
      return;
    }

    updateInputOptions(
      brandStoreEntries.map((entry) => {
        if (entry.brandName !== brandName) return entry;
        return {
          ...entry,
          stores: [...entry.stores, nextValue],
        };
      })
    );
    setStoreDrafts((prev) => ({
      ...prev,
      [brandName]: "",
    }));
  };

  const handleRemoveStoreFromBrand = (brandName: string, storeName: string) => {
    updateInputOptions(
      brandStoreEntries.map((entry) =>
        entry.brandName === brandName
          ? {
              ...entry,
              stores: entry.stores.filter((store) => store !== storeName),
            }
          : entry
      )
    );
  };

  const enabledStepsCount = useMemo(
    () => flattenAgentWorkflowSteps(sortedSteps).filter(({ step }) => step.enabled).length,
    [sortedSteps]
  );
  const totalOptionsCount = useMemo(
    () =>
      flattenAgentWorkflowSteps(sortedSteps).reduce(
        (acc, { step }) => acc + step.options.filter((option) => option.enabled).length,
        0
      ),
    [sortedSteps]
  );
  const enabledPresetLibrarySectionCount = useMemo(
    () => sortedPresetLibrarySections.filter((section) => section.enabled).length,
    [sortedPresetLibrarySections]
  );
  const totalPresetLibraryNodeCount = useMemo(
    () =>
      sortedPresetLibrarySections.reduce(
        (total, section) => total + countPresetLibraryNodes(section.categories || []),
        0
      ),
    [sortedPresetLibrarySections]
  );

  const updatePresetLibrarySection = (
    sectionId: string,
    updater: (section: AgentPresetLibrarySection) => AgentPresetLibrarySection
  ) => {
    setPresetLibraryConfig((prev) => ({
      sections: prev.sections
        .map((section) => (section.id === sectionId ? updater(section) : section))
        .sort((left, right) => left.sortOrder - right.sortOrder)
        .map((section, index) => ({
          ...section,
          sortOrder: index,
        })),
    }));
  };

  const handleAddPresetLibrarySection = () => {
    setPresetLibraryConfig((prev) => {
      const nextSection = createPresetLibrarySectionDraft(
        prev.sections.length,
        prev.sections.map((section) => section.id)
      );
      return {
        sections: [...prev.sections, nextSection].map((section, index) => ({
          ...section,
          sortOrder: index,
        })),
      };
    });
    setActiveTab("categories");
  };

  const handleRemovePresetLibrarySection = (sectionId: string) => {
    setPresetLibraryConfig((prev) => ({
      sections: prev.sections
        .filter((section) => section.id !== sectionId)
        .map((section, index) => ({
          ...section,
          sortOrder: index,
        })),
    }));
  };

  const handleAddPresetLibraryNode = (sectionId: string, parentNodeId?: string) => {
    setPresetLibraryConfig((prev) => {
      const targetSection = prev.sections.find((section) => section.id === sectionId);
      if (!targetSection) return prev;

      const existingNodeIds = collectPresetLibraryNodeIds(targetSection.categories || []);
      const nextSections = prev.sections.map((section) => {
        if (section.id !== sectionId) return section;

        if (!parentNodeId) {
          return {
            ...section,
            categories: [
              ...(section.categories || []),
              createPresetLibraryNodeDraft(1, (section.categories || []).length, existingNodeIds),
            ].map((node, index) => ({
              ...node,
              sortOrder: index,
            })),
          };
        }

        const resolveDepth = (
          nodes: AgentPresetLibraryCategoryNode[],
          depth: number
        ): number | null => {
          for (const node of nodes) {
            if (node.id === parentNodeId) return depth;
            const childDepth = resolveDepth(node.children || [], depth + 1);
            if (childDepth) return childDepth;
          }
          return null;
        };

        const parentNode = findPresetLibraryNodeById(section.categories || [], parentNodeId);
        const parentDepth = resolveDepth(section.categories || [], 1);
        if (!parentNode || !parentDepth || parentDepth >= AGENT_PRESET_LIBRARY_MAX_DEPTH) {
          return section;
        }

        return {
          ...section,
          categories: updatePresetLibraryNodeTree(
            section.categories || [],
            parentNodeId,
            (node) => ({
              ...node,
              children: [
                ...(node.children || []),
                createPresetLibraryNodeDraft(
                  parentDepth + 1,
                  (node.children || []).length,
                  existingNodeIds
                ),
              ].map((child, index) => ({
                ...child,
                sortOrder: index,
              })),
            })
          ),
        };
      });

      return { sections: nextSections };
    });
    setActiveTab("categories");
  };

  const handleRemovePresetLibraryNode = (sectionId: string, nodeId: string) => {
    setPresetLibraryConfig((prev) => ({
      sections: prev.sections.map((section) => {
        if (section.id !== sectionId) return section;
        return {
          ...section,
          categories: removePresetLibraryNodeTree(section.categories || [], nodeId).map(
            (node, index) => ({
              ...node,
              sortOrder: index,
            })
          ),
        };
      }),
    }));
  };

  const updatePresetLibraryNode = (
    sectionId: string,
    nodeId: string,
    updater: (node: AgentPresetLibraryCategoryNode) => AgentPresetLibraryCategoryNode
  ) => {
    setPresetLibraryConfig((prev) => ({
      sections: prev.sections.map((section) => {
        if (section.id !== sectionId) return section;
        return {
          ...section,
          categories: updatePresetLibraryNodeTree(section.categories || [], nodeId, updater),
        };
      }),
    }));
  };

  const toggleStepExpansion = (stepKey: string) => {
    setExpandedSteps((prev) => {
      const next = new Set(prev);
      if (next.has(stepKey)) {
        next.delete(stepKey);
      } else {
        next.add(stepKey);
      }
      return next;
    });
  };

  const updateStep = (
    stepKey: string,
    updater: (step: AgentWorkflowUiConfig["steps"][number]) => AgentWorkflowUiConfig["steps"][number]
  ) => {
    setConfig((prev) =>
      normalizeConfigOrdering({
        ...prev,
        steps: updateWorkflowStepTree(prev.steps, stepKey, updater),
      })
    );
  };

  const updateOption = (
    stepKey: string,
    optionKey: string,
    updater: (
      option: AgentWorkflowUiConfig["steps"][number]["options"][number]
    ) => AgentWorkflowUiConfig["steps"][number]["options"][number]
  ) => {
    updateStep(stepKey, (step) => ({
      ...step,
      options: updateWorkflowOptionTree(step.options, optionKey, updater),
    }));
  };

  const handleAddStep = () => {
    setConfig((prev) => {
      const existingStepKeys = collectWorkflowStepKeys(prev.steps);
      const newStep = createWorkflowStepDraft(1, prev.steps.length, existingStepKeys);
      setExpandedSteps((prevExpanded) => new Set([...prevExpanded, newStep.key]));
      return normalizeConfigOrdering({
        ...prev,
        steps: [...prev.steps, newStep],
      });
    });
    setActiveTab("workflow");
  };

  const handleRemoveStep = (stepKey: string) => {
    const targetStep = findAgentWorkflowStepByKey(config.steps, stepKey);
    setConfig((prev) =>
      normalizeConfigOrdering({
        ...prev,
        steps: removeWorkflowStepTree(prev.steps, stepKey),
      })
    );
    setExpandedSteps((prev) => {
      const next = new Set(prev);
      for (const key of targetStep ? collectDescendantStepKeys(targetStep) : [stepKey]) {
        next.delete(key);
      }
      return next;
    });
  };

  const handleAddOption = (stepKey: string, parentOptionKey?: string) => {
    updateStep(stepKey, (step) => {
      const existingOptionKeys = collectWorkflowOptionKeys(step.options || []);
      if (!parentOptionKey) {
        return {
          ...step,
          options: normalizeAgentWorkflowOptionOrdering([
            ...step.options,
            createWorkflowOptionDraft(step.key, step.options.length, existingOptionKeys),
          ]),
        };
      }

      const parentOption = findAgentWorkflowOptionByKey(step.options || [], parentOptionKey);
      const parentDepth = flattenAgentWorkflowOptionTree(step.options || []).find(
        ({ option }) => option.key === parentOptionKey
      )?.depth;
      if (!parentOption || !parentDepth || parentDepth >= 3) {
        return step;
      }

      return {
        ...step,
        options: updateWorkflowOptionTree(step.options || [], parentOptionKey, (option) => ({
          ...option,
          children: normalizeAgentWorkflowOptionOrdering([
            ...(option.children || []),
            createWorkflowOptionDraft(
              step.key,
              (option.children || []).length,
              existingOptionKeys
            ),
          ]),
        })),
      };
    });
  };

  const handleRemoveOption = (stepKey: string, optionKey: string) => {
    updateStep(stepKey, (step) => ({
      ...step,
      options: normalizeAgentWorkflowOptionOrdering(
        removeWorkflowOptionTree(step.options, optionKey)
      ),
    }));
  };

  const handleUploadPreview = async (stepKey: string, optionKey: string, file: File) => {
    if (!file.type.startsWith("image/")) {
      toast.error("请上传图片文件");
      return;
    }

    const refKey = `${stepKey}:${optionKey}`;
    try {
      setUploadingKey(refKey);
      const formData = new FormData();
      formData.append("file", file);

      const response = await fetchUploadWithRetry(formData);
      const result = await response.json();

      if (!response.ok || !result?.url) {
        throw new Error(result?.error || "上传失败");
      }

      updateOption(stepKey, optionKey, (option) => ({
        ...option,
        previewImageUrl: result.url,
      }));
      toast.success("预览图上传成功");
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "预览图上传失败");
    } finally {
      setUploadingKey(null);
    }
  };

  const handleSave = async () => {
    try {
      setIsSaving(true);
      const response = await fetch("/api/site-settings", {
        method: "PUT",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          agentPresetLibraryConfig: presetLibraryConfig,
          agentWorkflowUiConfig: config,
          agentWorkflowMaterialApiConfig: materialApiConfig,
          agentWorkflowBrandModelConfig: brandModelConfig,
          agentWorkflowShowcaseConfig: showcaseConfig,
        }),
      });

      if (!response.ok) {
        throw new Error("保存失败");
      }

      toast.success("智能体工作流配置已保存");
      await mutate();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "保存失败");
    } finally {
      setIsSaving(false);
    }
  };

  const renderPresetLibraryNodeCard = (
    sectionId: string,
    node: AgentPresetLibraryCategoryNode,
    depth: number,
    indexPath: number[]
  ): React.ReactNode => {
    const levelLabel =
      PRESET_LIBRARY_LEVEL_LABELS[Math.max(0, Math.min(depth - 1, PRESET_LIBRARY_LEVEL_LABELS.length - 1))] ||
      `第 ${depth} 级分类`;
    const canAddChild = depth < AGENT_PRESET_LIBRARY_MAX_DEPTH;
    const sortedChildren = [...(node.children || [])].sort(
      (left, right) => left.sortOrder - right.sortOrder
    );

    return (
      <div key={node.id} className={cn("space-y-3", depth > 1 && "pl-4 sm:pl-6")}>
        <Card className={cn(!node.enabled && "opacity-60", depth > 1 && "border-l-4 border-l-sky-500/30")}>
          <CardHeader className="py-4">
            <div className="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
              <div className="flex min-w-0 items-center gap-3">
                <div className="flex h-9 min-w-9 items-center justify-center rounded-md bg-sky-500/10 px-2 text-xs font-medium text-sky-600">
                  {indexPath.join(".")}
                </div>
                <div className="min-w-0 flex-1 space-y-2">
                  <div className="flex flex-wrap items-center gap-2">
                    <Input
                      value={node.name}
                      onChange={(e) =>
                        updatePresetLibraryNode(sectionId, node.id, (currentNode) => ({
                          ...currentNode,
                          name: e.target.value,
                        }))
                      }
                      className="h-8 min-w-[200px] max-w-[320px] border-0 bg-transparent px-0 text-base font-medium shadow-none focus-visible:ring-0"
                      placeholder="分类名称"
                    />
                    <Badge variant="outline">{levelLabel}</Badge>
                    <code className="rounded bg-muted px-1.5 py-0.5 text-xs text-muted-foreground">
                      {node.id}
                    </code>
                  </div>
                </div>
              </div>

              <div className="flex flex-wrap items-center gap-2">
                <Badge variant="secondary">{sortedChildren.length} 子分类</Badge>
                {canAddChild ? (
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    onClick={() => handleAddPresetLibraryNode(sectionId, node.id)}
                  >
                    <Plus className="mr-2 h-4 w-4" />
                    新增子级
                  </Button>
                ) : (
                  <Badge variant="outline">已达三级</Badge>
                )}
                <Switch
                  checked={node.enabled}
                  onCheckedChange={(checked) =>
                    updatePresetLibraryNode(sectionId, node.id, (currentNode) => ({
                      ...currentNode,
                      enabled: checked,
                    }))
                  }
                />
                <Button
                  type="button"
                  variant="ghost"
                  size="icon"
                  className="h-8 w-8 text-destructive"
                  onClick={() => handleRemovePresetLibraryNode(sectionId, node.id)}
                >
                  <Trash2 className="h-4 w-4" />
                </Button>
              </div>
            </div>
          </CardHeader>

          <CardContent className="border-t bg-muted/20 pt-4">
            {sortedChildren.length > 0 ? (
              <div className="space-y-4 border-l border-dashed border-border/80 pl-3 sm:pl-4">
                {sortedChildren.map((childNode, childIndex) =>
                  renderPresetLibraryNodeCard(sectionId, childNode, depth + 1, [
                    ...indexPath,
                    childIndex + 1,
                  ])
                )}
              </div>
            ) : (
              <div className="rounded-lg border border-dashed bg-background/60 px-4 py-6 text-center text-sm text-muted-foreground">
                暂无子分类
              </div>
            )}
          </CardContent>
        </Card>
      </div>
    );
  };

  const renderPresetLibrarySectionCard = (
    section: AgentPresetLibrarySection,
    index: number
  ) => {
    const sortedCategories = [...(section.categories || [])].sort(
      (left, right) => left.sortOrder - right.sortOrder
    );

    return (
      <motion.div key={section.id} variants={itemVariants}>
        <Card className={!section.enabled ? "opacity-70" : undefined}>
          <CardHeader className="pb-4">
            <div className="flex flex-col gap-4 lg:flex-row lg:items-start lg:justify-between">
              <div className="space-y-3">
                <div className="flex items-center gap-3">
                  <div className="flex h-10 w-10 items-center justify-center rounded-lg bg-sky-500/10 text-sm font-semibold text-sky-600">
                    {index + 1}
                  </div>
                  <div>
                    <CardTitle className="text-base">顶部分类页</CardTitle>
                    <CardDescription>
                      “我的作品”固定保留，这里维护其余可显示的生图模式分类页与三级分类树。
                    </CardDescription>
                  </div>
                </div>

                <div className="grid gap-3 md:grid-cols-[minmax(220px,280px)_1fr]">
                  <div className="space-y-2">
                    <Label className="text-xs">分类页名称</Label>
                    <Input
                      value={section.label}
                      onChange={(e) =>
                        updatePresetLibrarySection(section.id, (currentSection) => ({
                          ...currentSection,
                          label: e.target.value,
                        }))
                      }
                      placeholder="例如：案例广场"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label className="text-xs">说明文案</Label>
                    <Input
                      value={section.description || ""}
                      onChange={(e) =>
                        updatePresetLibrarySection(section.id, (currentSection) => ({
                          ...currentSection,
                          description: e.target.value,
                        }))
                      }
                      placeholder="用于后台区分该分类页的用途"
                    />
                  </div>
                </div>

                <div className="flex flex-wrap items-center gap-2">
                  <Badge variant="outline">{sortedCategories.length} 个一级分类</Badge>
                  <Badge variant="secondary">
                    共 {countPresetLibraryNodes(section.categories || [])} 个树节点
                  </Badge>
                  <code className="rounded bg-muted px-1.5 py-0.5 text-xs text-muted-foreground">
                    {section.id}
                  </code>
                </div>
              </div>

              <div className="flex flex-wrap items-center gap-2">
                <Button
                  type="button"
                  variant="outline"
                  size="sm"
                  onClick={() => handleAddPresetLibraryNode(section.id)}
                >
                  <Plus className="mr-2 h-4 w-4" />
                  新增一级分类
                </Button>
                <Switch
                  checked={section.enabled}
                  onCheckedChange={(checked) =>
                    updatePresetLibrarySection(section.id, (currentSection) => ({
                      ...currentSection,
                      enabled: checked,
                    }))
                  }
                />
                <Button
                  type="button"
                  variant="ghost"
                  size="icon"
                  className="h-8 w-8 text-destructive"
                  onClick={() => handleRemovePresetLibrarySection(section.id)}
                >
                  <Trash2 className="h-4 w-4" />
                </Button>
              </div>
            </div>
          </CardHeader>

          <CardContent className="border-t bg-muted/20 pt-4">
            {sortedCategories.length > 0 ? (
              <div className="space-y-4">
                {sortedCategories.map((node, nodeIndex) =>
                  renderPresetLibraryNodeCard(section.id, node, 1, [nodeIndex + 1])
                )}
              </div>
            ) : (
              <div className="rounded-lg border border-dashed bg-background/60 px-4 py-10 text-center text-sm text-muted-foreground">
                当前分类页还没有任何分类树节点，先新增一级分类即可继续建立二级、三级关系。
              </div>
            )}
          </CardContent>
        </Card>
      </motion.div>
    );
  };

  const renderWorkflowOptionCard = (
    step: AgentWorkflowStepUiConfig,
    option: AgentWorkflowOptionUiConfig,
    depth: number,
    indexPath: number[]
  ): ReactNode => {
    const refKey = `${step.key}:${option.key}`;
    const isUploading = uploadingKey === refKey;
    const levelLabel =
      WORKFLOW_OPTION_LEVEL_LABELS[Math.max(0, Math.min(depth - 1, WORKFLOW_OPTION_LEVEL_LABELS.length - 1))] ||
      `第 ${depth} 级卡片`;
    const sortedChildren = [...(option.children || [])].sort(
      (left, right) => left.sortOrder - right.sortOrder
    );
    const canAddChild = depth < 3;

    return (
      <div key={option.key} className={cn("space-y-4", depth > 1 && "pl-4 sm:pl-6")}>
        <div
          className={cn(
            "rounded-lg border bg-card p-4",
            !option.enabled && "opacity-60",
            depth > 1 && "border-l-4 border-l-sky-500/30"
          )}
        >
          <div className="mb-4 flex flex-col gap-3 lg:flex-row lg:items-start lg:justify-between">
            <div className="min-w-0 flex-1">
              <div className="mb-3 flex flex-wrap items-center gap-2">
                <span className="flex h-8 min-w-8 items-center justify-center rounded-md bg-sky-500/10 px-2 text-xs font-medium text-sky-600">
                  {indexPath.join(".")}
                </span>
                <Badge variant="outline">{levelLabel}</Badge>
                <Badge variant="secondary">{sortedChildren.length} 子卡片</Badge>
                <code className="rounded bg-muted px-1.5 py-0.5 text-xs text-muted-foreground">
                  {option.key}
                </code>
              </div>

              <div className="grid grid-cols-[100px_1fr] gap-4">
                <div className="space-y-2">
                  <div className="aspect-square overflow-hidden rounded-lg border bg-muted">
                    {option.previewImageUrl ? (
                      <img
                        src={option.previewImageUrl}
                        alt={option.buttonName}
                        className="h-full w-full object-cover"
                      />
                    ) : (
                      <div className="flex h-full flex-col items-center justify-center gap-1 text-muted-foreground">
                        <ImageIcon className="h-6 w-6 opacity-40" />
                        <span className="text-[10px]">无图片</span>
                      </div>
                    )}
                  </div>
                  <input
                    ref={(el) => {
                      fileInputRefs.current[refKey] = el;
                    }}
                    type="file"
                    accept="image/*"
                    className="hidden"
                    onChange={(e) => {
                      const file = e.target.files?.[0];
                      if (file) {
                        void handleUploadPreview(step.key, option.key, file);
                      }
                      e.target.value = "";
                    }}
                  />
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    className="w-full text-xs"
                    disabled={isUploading}
                    onClick={() => fileInputRefs.current[refKey]?.click()}
                  >
                    {isUploading ? (
                      <Loader2 className="mr-1 h-3 w-3 animate-spin" />
                    ) : (
                      <Upload className="mr-1 h-3 w-3" />
                    )}
                    上传
                  </Button>
                </div>

                <div className="space-y-3">
                  <div className="space-y-1">
                    <Label className="text-xs">按钮名称</Label>
                    <Input
                      value={option.buttonName}
                      onChange={(e) =>
                        updateOption(step.key, option.key, (currentOption) => ({
                          ...currentOption,
                          buttonName: e.target.value,
                        }))
                      }
                      placeholder="选项名称"
                      className="h-8"
                    />
                  </div>
                  <div className="space-y-1">
                    <Label className="text-xs">说明文案</Label>
                    <Input
                      value={option.description || ""}
                      onChange={(e) =>
                        updateOption(step.key, option.key, (currentOption) => ({
                          ...currentOption,
                          description: e.target.value,
                        }))
                      }
                      placeholder="简短描述"
                      className="h-8"
                    />
                  </div>
                  <div className="space-y-1">
                    <Label className="text-xs">Prompt 片段</Label>
                    <Textarea
                      value={option.promptFragment || ""}
                      onChange={(e) =>
                        updateOption(step.key, option.key, (currentOption) => ({
                          ...currentOption,
                          promptFragment: e.target.value,
                        }))
                      }
                      placeholder="注入的提示词片段"
                      rows={2}
                      className="resize-none text-xs"
                    />
                  </div>
                </div>
              </div>
            </div>

            <div className="flex flex-wrap items-center gap-1">
              {canAddChild ? (
                <Button
                  type="button"
                  variant="outline"
                  size="sm"
                  onClick={() => handleAddOption(step.key, option.key)}
                >
                  <Plus className="mr-2 h-4 w-4" />
                  新增子卡片
                </Button>
              ) : (
                <Badge variant="outline">已达三级</Badge>
              )}
              <Button
                type="button"
                variant="ghost"
                size="icon"
                className="h-7 w-7 text-destructive"
                onClick={() => handleRemoveOption(step.key, option.key)}
              >
                <Trash2 className="h-3.5 w-3.5" />
              </Button>
              <Switch
                checked={option.enabled}
                onCheckedChange={(checked) =>
                  updateOption(step.key, option.key, (currentOption) => ({
                    ...currentOption,
                    enabled: checked,
                  }))
                }
                className="scale-75"
              />
            </div>
          </div>

          <div className="space-y-4">
            <div className="flex items-center justify-between">
              <div>
                <div className="text-sm font-medium">子卡片配置</div>
                <div className="text-xs text-muted-foreground">
                  当前卡片下可继续建立二级、三级卡片母子关系。
                </div>
              </div>
            </div>

            {sortedChildren.length > 0 ? (
              <div className="space-y-4 border-l border-dashed border-border/80 pl-3 sm:pl-4">
                {sortedChildren.map((childOption, childIndex) =>
                  renderWorkflowOptionCard(step, childOption, depth + 1, [
                    ...indexPath,
                    childIndex + 1,
                  ])
                )}
              </div>
            ) : (
              <div className="rounded-lg border border-dashed bg-background/60 px-4 py-6 text-center text-sm text-muted-foreground">
                暂无子卡片
              </div>
            )}
          </div>
        </div>
      </div>
    );
  };

  const renderWorkflowStepCard = (
    step: AgentWorkflowStepUiConfig,
    depth: number,
    indexPath: number[]
  ) => {
    const stepLabel = indexPath.join(".");
    const levelLabel =
      WORKFLOW_LEVEL_LABELS[Math.max(0, Math.min(depth - 1, WORKFLOW_LEVEL_LABELS.length - 1))] ||
      `第 ${depth} 级模块`;
    const rootOptions = [...(step.options || [])].sort((left, right) => left.sortOrder - right.sortOrder);
    const optionCardCount = countAgentWorkflowOptionTree(step.options || []);

    return (
      <motion.div
        key={step.key}
        variants={itemVariants}
        className={cn(depth > 1 && "pl-4 sm:pl-6")}
      >
        <Collapsible
          open={expandedSteps.has(step.key)}
          onOpenChange={() => toggleStepExpansion(step.key)}
        >
          <Card
            className={cn(
              !step.enabled && "opacity-60",
              depth > 1 && "border-l-4 border-l-emerald-500/30"
            )}
          >
            <CardHeader className="py-4">
              <div className="flex flex-col gap-3 lg:flex-row lg:items-center">
                <div className="flex items-center gap-4">
                  <CollapsibleTrigger asChild>
                    <button className="flex h-8 w-8 items-center justify-center rounded-md hover:bg-muted">
                      {expandedSteps.has(step.key) ? (
                        <ChevronDown className="h-4 w-4" />
                      ) : (
                        <ChevronRight className="h-4 w-4" />
                      )}
                    </button>
                  </CollapsibleTrigger>

                  <div className="flex h-9 min-w-9 items-center justify-center rounded-md bg-emerald-500/10 px-2 text-xs font-medium text-emerald-600">
                    {stepLabel}
                  </div>
                </div>

                <div className="min-w-0 flex-1">
                  <div className="flex flex-wrap items-center gap-2">
                    <Input
                      value={step.title}
                      onChange={(e) =>
                        updateStep(step.key, (currentStep) => ({
                          ...currentStep,
                          title: e.target.value,
                        }))
                      }
                      className="h-8 min-w-[180px] max-w-[260px] border-0 bg-transparent px-0 text-base font-medium shadow-none focus-visible:ring-0"
                      placeholder="模块标题"
                    />
                    <Badge variant="outline">{levelLabel}</Badge>
                    <code className="rounded bg-muted px-1.5 py-0.5 text-xs text-muted-foreground">
                      {step.key}
                    </code>
                  </div>
                </div>

                <div className="flex flex-wrap items-center gap-2">
                  <Badge variant="secondary">{optionCardCount} 张卡片</Badge>
                  <Badge variant="outline">卡片树结构</Badge>
                  <Switch
                    checked={step.enabled}
                    onCheckedChange={(checked) =>
                      updateStep(step.key, (currentStep) => ({
                        ...currentStep,
                        enabled: checked,
                      }))
                    }
                  />
                  <Button
                    type="button"
                    variant="ghost"
                    size="icon"
                    className="h-8 w-8 text-destructive"
                    onClick={() => handleRemoveStep(step.key)}
                  >
                    <Trash2 className="h-4 w-4" />
                  </Button>
                </div>
              </div>
            </CardHeader>

            <CollapsibleContent>
              <CardContent className="border-t bg-muted/20 pt-4">
                <div className="mb-4 space-y-2">
                  <Label className="text-xs">模块说明</Label>
                  <Textarea
                    value={step.description || ""}
                    onChange={(e) =>
                      updateStep(step.key, (currentStep) => ({
                        ...currentStep,
                        description: e.target.value,
                      }))
                    }
                    rows={2}
                    placeholder="描述此模块的用途..."
                    className="bg-background"
                  />
                </div>

                <div className="mb-4 flex items-center justify-between">
                  <span className="text-sm font-medium">卡片配置</span>
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    onClick={() => handleAddOption(step.key)}
                  >
                    <Plus className="mr-2 h-4 w-4" />
                    新增一级卡片
                  </Button>
                </div>

                {rootOptions.length > 0 ? (
                  <div className="space-y-4">
                    {rootOptions.map((option, optionIndex) =>
                      renderWorkflowOptionCard(step, option, 1, [optionIndex + 1])
                    )}
                  </div>
                ) : (
                  <div className="rounded-lg border border-dashed py-8 text-center text-sm text-muted-foreground">
                    暂无卡片，点击上方按钮添加
                  </div>
                )}
              </CardContent>
            </CollapsibleContent>
          </Card>
        </Collapsible>
      </motion.div>
    );
  };

  const updateBrandModelEntry = (
    brandName: string,
    updater: (
      entry: NonNullable<AgentWorkflowBrandModelConfig["entries"][number]>
    ) => NonNullable<AgentWorkflowBrandModelConfig["entries"][number]>
  ) => {
    setBrandModelConfig((prev) => {
      const entryIndex = prev.entries.findIndex((entry) => entry.brandName === brandName);
      const currentEntry =
        entryIndex >= 0
          ? prev.entries[entryIndex]
          : {
              brandName,
              images: [],
            };
      const nextEntry = updater(currentEntry);
      const nextEntries =
        entryIndex >= 0
          ? prev.entries.map((entry, index) => (index === entryIndex ? nextEntry : entry))
          : [...prev.entries, nextEntry];

      return {
        entries: nextEntries
          .filter((entry) => entry.images.length > 0 || configuredBrands.includes(entry.brandName))
          .map((entry) => ({
            ...entry,
            images: entry.images
              .slice()
              .sort((left, right) => left.sortOrder - right.sortOrder)
              .map((image, index) => ({
                ...image,
                sortOrder: index,
              })),
          })),
      };
    });
  };

  const handleUploadBrandModelImages = async (brandName: string, files: FileList | null) => {
    const pickedFiles = Array.from(files || []).filter((file) => file.type.startsWith("image/"));
    if (pickedFiles.length === 0) {
      toast.error("请先选择图片文件");
      return;
    }

    const refKey = `brand-model:${brandName}`;
    try {
      setUploadingKey(refKey);
      const uploadedImages: AgentWorkflowBrandModelConfig["entries"][number]["images"] = [];

      for (const file of pickedFiles) {
        const formData = new FormData();
        formData.append("file", file);

        const response = await fetchUploadWithRetry(formData);
        const result = await response.json();

        if (!response.ok || !result?.url) {
          throw new Error(result?.error || "上传失败");
        }

        uploadedImages.push({
          id:
            (typeof result.assetId === "string" && result.assetId.trim()) ||
            `${Date.now()}-${Math.random().toString(36).slice(2, 10)}`,
          assetId: typeof result.assetId === "string" ? result.assetId : null,
          imageUrl: result.url,
          displayName: file.name,
          mimeType: file.type || null,
          sortOrder: 0,
        });
      }

      updateBrandModelEntry(brandName, (entry) => ({
        ...entry,
        images: [
          ...entry.images,
          ...uploadedImages.map((image, index) => ({
            ...image,
            sortOrder: entry.images.length + index,
          })),
        ],
      }));
      toast.success(
        uploadedImages.length === 1 ? "模特图上传成功" : `已上传 ${uploadedImages.length} 张模特图`
      );
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "模特图上传失败");
    } finally {
      setUploadingKey(null);
    }
  };

  const handleRemoveBrandModelImage = (brandName: string, imageId: string) => {
    updateBrandModelEntry(brandName, (entry) => ({
      ...entry,
      images: entry.images.filter((image) => image.id !== imageId),
    }));
  };

  const handleUploadShowcaseAsset = async (
    target: "video" | "poster",
    file: File
  ) => {
    const isVideo = target === "video";
    const expectedPrefix = isVideo ? "video/" : "image/";

    if (!file.type.startsWith(expectedPrefix)) {
      toast.error(isVideo ? "请上传视频文件" : "请上传图片文件");
      return;
    }

    const refKey = `showcase:${target}`;
    try {
      setUploadingKey(refKey);
      const formData = new FormData();
      formData.append("file", file);

      const response = await fetchUploadWithRetry(formData);
      const result = await response.json();

      if (!response.ok || !result?.url) {
        throw new Error(result?.error || "上传失败");
      }

      setShowcaseConfig((prev) => ({
        ...prev,
        [target === "video" ? "videoUrl" : "posterUrl"]: result.url,
      }));
      toast.success(isVideo ? "视频海报上传成功" : "视频封面上传成功");
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "上传失败");
    } finally {
      setUploadingKey(null);
    }
  };

  if (isLoading) {
    return (
      <div className="container mx-auto p-6">
        <div className="flex h-[60vh] items-center justify-center">
          <div className="flex items-center gap-3 text-muted-foreground">
            <Loader2 className="h-5 w-5 animate-spin" />
            <span>加载配置中...</span>
          </div>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gradient-to-b from-background to-muted/20">
      {/* Header */}
      <header className="sticky top-0 z-30 border-b bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60">
        <div className="container mx-auto px-6 py-4">
          <div className="flex flex-wrap items-center justify-between gap-4">
            <div className="flex items-center gap-4">
              <div className="flex h-10 w-10 items-center justify-center rounded-xl bg-gradient-to-br from-violet-500 to-purple-600 shadow-lg shadow-violet-500/20">
                <Sparkles className="h-5 w-5 text-white" />
              </div>
              <div>
                <h1 className="text-xl font-semibold tracking-tight">智能体工作流配置</h1>
                <p className="text-sm text-muted-foreground">
                  配置智能体页面的视频海报、素材搜索、品牌模特及工作流步骤
                </p>
              </div>
            </div>

            <div className="flex items-center gap-2">
              <Button asChild variant="outline" size="sm">
                <Link href={backHref}>
                  <ArrowLeft className="mr-2 h-4 w-4" />
                  {backLabel}
                </Link>
              </Button>
              <Button 
                onClick={handleSave} 
                disabled={isSaving}
                size="sm"
                className="bg-gradient-to-r from-violet-600 to-purple-600 hover:from-violet-500 hover:to-purple-500"
              >
                {isSaving ? (
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                ) : (
                  <Save className="mr-2 h-4 w-4" />
                )}
                保存配置
              </Button>
            </div>
          </div>
        </div>
      </header>

      {/* Stats Bar */}
      <div className="border-b bg-muted/30">
        <div className="container mx-auto px-6 py-3">
          <div className="flex flex-wrap items-center gap-6">
            <div className="flex items-center gap-2">
              <Badge variant="secondary" className="font-mono">
                {enabledStepsCount}
              </Badge>
              <span className="text-sm text-muted-foreground">已启用步骤</span>
            </div>
            <div className="flex items-center gap-2">
              <Badge variant="secondary" className="font-mono">
                {totalOptionsCount}
              </Badge>
              <span className="text-sm text-muted-foreground">已启用选项</span>
            </div>
            <div className="flex items-center gap-2">
              <Badge variant="secondary" className="font-mono">
                {enabledPresetLibrarySectionCount}
              </Badge>
              <span className="text-sm text-muted-foreground">分类页</span>
            </div>
            <div className="flex items-center gap-2">
              <Badge variant="secondary" className="font-mono">
                {totalPresetLibraryNodeCount}
              </Badge>
              <span className="text-sm text-muted-foreground">分类树节点</span>
            </div>
            <div className="flex items-center gap-2">
              <Badge 
                variant={materialApiConfig.enabled ? "default" : "secondary"}
                className={cn(
                  "font-mono",
                  materialApiConfig.enabled && "bg-emerald-500/10 text-emerald-600 hover:bg-emerald-500/20"
                )}
              >
                {materialApiConfig.enabled ? "已开启" : "已关闭"}
              </Badge>
              <span className="text-sm text-muted-foreground">素材搜索</span>
            </div>
            <div className="flex items-center gap-2">
              <Badge 
                variant={showcaseConfig.enabled ? "default" : "secondary"}
                className={cn(
                  "font-mono",
                  showcaseConfig.enabled && "bg-emerald-500/10 text-emerald-600 hover:bg-emerald-500/20"
                )}
              >
                {showcaseConfig.enabled ? "已开启" : "已关闭"}
              </Badge>
              <span className="text-sm text-muted-foreground">顶部视频</span>
            </div>
          </div>
        </div>
      </div>

      {/* Main Content */}
      <main className="container mx-auto p-6">
        <Tabs value={activeTab} onValueChange={setActiveTab} className="space-y-6">
          <TabsList className="grid w-full grid-cols-5 lg:w-fit">
            <TabsTrigger value="showcase" className="gap-2">
              <MonitorPlay className="h-4 w-4" />
              <span className="hidden sm:inline">顶部海报</span>
            </TabsTrigger>
            <TabsTrigger value="basics" className="gap-2">
              <Settings2 className="h-4 w-4" />
              <span className="hidden sm:inline">基础配置</span>
            </TabsTrigger>
            <TabsTrigger value="models" className="gap-2">
              <UserCircle className="h-4 w-4" />
              <span className="hidden sm:inline">品牌模特</span>
              <Badge variant="secondary" className="ml-1 h-5 px-1.5 text-xs">
                {brandModelConfig.entries.reduce((acc, e) => acc + e.images.length, 0)}
              </Badge>
            </TabsTrigger>
            <TabsTrigger value="categories" className="gap-2">
              <Package className="h-4 w-4" />
              <span className="hidden sm:inline">生图分类</span>
              <Badge variant="secondary" className="ml-1 h-5 px-1.5 text-xs">
                {sortedPresetLibrarySections.length}
              </Badge>
            </TabsTrigger>
            <TabsTrigger value="workflow" className="gap-2">
              <Layers className="h-4 w-4" />
              <span className="hidden sm:inline">工作流步骤</span>
              <Badge variant="secondary" className="ml-1 h-5 px-1.5 text-xs">
                {sortedSteps.length}
              </Badge>
            </TabsTrigger>
          </TabsList>

          {/* Showcase Tab */}
          <TabsContent value="showcase" className="space-y-6">
            <motion.div
              initial="hidden"
              animate="visible"
              variants={containerVariants}
              className="grid gap-6 lg:grid-cols-[1fr_400px]"
            >
              <motion.div variants={itemVariants} className="space-y-6">
                <Card>
                  <CardHeader className="pb-4">
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-3">
                        <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-violet-500/10">
                          <Video className="h-4 w-4 text-violet-600" />
                        </div>
                        <div>
                          <CardTitle className="text-base">顶部视频海报</CardTitle>
                          <CardDescription>
                            配置第一步顶部展示区的视频海报内容
                          </CardDescription>
                        </div>
                      </div>
                      <Switch
                        checked={showcaseConfig.enabled}
                        onCheckedChange={(checked) =>
                          setShowcaseConfig((prev) => ({ ...prev, enabled: checked }))
                        }
                      />
                    </div>
                  </CardHeader>
                  <CardContent className="space-y-6">
                    <div className="grid grid-cols-2 gap-4">
                      <div className="space-y-2">
                        <Label className="text-xs">顶部主标题</Label>
                        <Input
                          value={showcaseConfig.title}
                          onChange={(e) =>
                            setShowcaseConfig((prev) => ({ ...prev, title: e.target.value }))
                          }
                          placeholder="三倍速出片，电影级质感"
                        />
                      </div>
                      <div className="space-y-2">
                        <Label className="text-xs">顶部副标题</Label>
                        <Input
                          value={showcaseConfig.subtitle}
                          onChange={(e) =>
                            setShowcaseConfig((prev) => ({ ...prev, subtitle: e.target.value }))
                          }
                          placeholder="第一步：风格选择  第二步：生图模式"
                        />
                      </div>
                    </div>

                    <div className="grid grid-cols-2 gap-4">
                      <div className="space-y-2">
                        <Label className="text-xs">按钮文案</Label>
                        <Input
                          value={showcaseConfig.actionText}
                          onChange={(e) =>
                            setShowcaseConfig((prev) => ({ ...prev, actionText: e.target.value }))
                          }
                          placeholder="我要创作"
                        />
                      </div>
                      <div className="space-y-2">
                        <Label className="text-xs">海报底部说明</Label>
                        <Input
                          value={showcaseConfig.footerText || ""}
                          onChange={(e) =>
                            setShowcaseConfig((prev) => ({ ...prev, footerText: e.target.value }))
                          }
                          placeholder="用户作品"
                        />
                      </div>
                    </div>

                    <div className="space-y-2">
                      <Label className="text-xs">海报叠加文字</Label>
                      <Textarea
                        value={showcaseConfig.overlayText || ""}
                        onChange={(e) =>
                          setShowcaseConfig((prev) => ({ ...prev, overlayText: e.target.value }))
                        }
                        rows={2}
                        placeholder="让每一步选择，都能直达高质感成片"
                      />
                    </div>

                    <Separator />

                    <div className="space-y-4">
                      <Label className="text-xs">媒体文件</Label>
                      <div className="grid grid-cols-2 gap-4">
                        <div className="space-y-2">
                          <Input
                            value={showcaseConfig.videoUrl}
                            onChange={(e) =>
                              setShowcaseConfig((prev) => ({ ...prev, videoUrl: e.target.value }))
                            }
                            placeholder="视频链接 https://..."
                          />
                          <input
                            ref={(el) => { fileInputRefs.current["showcase:video"] = el; }}
                            type="file"
                            accept="video/*"
                            className="hidden"
                            onChange={(e) => {
                              const file = e.target.files?.[0];
                              if (file) void handleUploadShowcaseAsset("video", file);
                              e.target.value = "";
                            }}
                          />
                          <Button
                            type="button"
                            variant="outline"
                            size="sm"
                            className="w-full"
                            disabled={uploadingKey === "showcase:video"}
                            onClick={() => fileInputRefs.current["showcase:video"]?.click()}
                          >
                            {uploadingKey === "showcase:video" ? (
                              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                            ) : (
                              <Upload className="mr-2 h-4 w-4" />
                            )}
                            上传视频
                          </Button>
                        </div>
                        <div className="space-y-2">
                          <Input
                            value={showcaseConfig.posterUrl || ""}
                            onChange={(e) =>
                              setShowcaseConfig((prev) => ({ ...prev, posterUrl: e.target.value }))
                            }
                            placeholder="封面链接 https://..."
                          />
                          <input
                            ref={(el) => { fileInputRefs.current["showcase:poster"] = el; }}
                            type="file"
                            accept="image/*"
                            className="hidden"
                            onChange={(e) => {
                              const file = e.target.files?.[0];
                              if (file) void handleUploadShowcaseAsset("poster", file);
                              e.target.value = "";
                            }}
                          />
                          <Button
                            type="button"
                            variant="outline"
                            size="sm"
                            className="w-full"
                            disabled={uploadingKey === "showcase:poster"}
                            onClick={() => fileInputRefs.current["showcase:poster"]?.click()}
                          >
                            {uploadingKey === "showcase:poster" ? (
                              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                            ) : (
                              <Upload className="mr-2 h-4 w-4" />
                            )}
                            上传封面
                          </Button>
                        </div>
                      </div>
                    </div>
                  </CardContent>
                </Card>
              </motion.div>

              {/* Preview Panel */}
              <motion.div variants={itemVariants}>
                <Card className="sticky top-24">
                  <CardHeader className="pb-4">
                    <CardTitle className="text-base">前台预览</CardTitle>
                    <CardDescription>实时查看海报展示效果</CardDescription>
                  </CardHeader>
                  <CardContent>
                    <div className="overflow-hidden rounded-2xl border bg-slate-950 shadow-2xl">
                      <div className="relative aspect-[21/9] w-full overflow-hidden bg-black">
                        {showcaseConfig.videoUrl ? (
                          <video
                            key={showcaseConfig.videoUrl}
                            src={showcaseConfig.videoUrl}
                            poster={showcaseConfig.posterUrl || undefined}
                            className="h-full w-full object-cover"
                            autoPlay
                            muted
                            loop
                            playsInline
                          />
                        ) : showcaseConfig.posterUrl ? (
                          <img
                            src={showcaseConfig.posterUrl}
                            alt={showcaseConfig.title}
                            className="h-full w-full object-cover"
                          />
                        ) : (
                          <div className="flex h-full w-full flex-col items-center justify-center gap-2 text-white/30">
                            <ImageIcon className="h-8 w-8" />
                            <span className="text-xs">暂无媒体</span>
                          </div>
                        )}
                        <div className="pointer-events-none absolute inset-0 bg-gradient-to-t from-black/70 via-black/20 to-black/40" />
                        
                        {showcaseConfig.overlayText && (
                          <div className="pointer-events-none absolute inset-0 flex items-center justify-center px-6 text-center">
                            <span className="text-lg font-semibold tracking-widest text-white/90 drop-shadow-lg">
                              {showcaseConfig.overlayText}
                            </span>
                          </div>
                        )}
                        
                        {showcaseConfig.footerText && (
                          <div className="pointer-events-none absolute bottom-4 left-4">
                            <span className="rounded-full border border-white/20 bg-black/40 px-3 py-1 text-xs text-white/80 backdrop-blur-sm">
                              {showcaseConfig.footerText}
                            </span>
                          </div>
                        )}
                      </div>
                    </div>

                    <div className="mt-4 space-y-3 rounded-xl border bg-muted/30 p-4">
                      <div>
                        <span className="text-xs text-muted-foreground">主标题</span>
                        <p className="font-medium">{showcaseConfig.title || "未设置"}</p>
                      </div>
                      <div>
                        <span className="text-xs text-muted-foreground">副标题</span>
                        <p className="text-sm">{showcaseConfig.subtitle || "未设置"}</p>
                      </div>
                      <div>
                        <span className="text-xs text-muted-foreground">按钮</span>
                        <p className="text-sm">{showcaseConfig.actionText || "未设置"}</p>
                      </div>
                    </div>
                  </CardContent>
                </Card>
              </motion.div>
            </motion.div>
          </TabsContent>

          {/* Basics Tab */}
          <TabsContent value="basics" className="space-y-6">
            <motion.div
              initial="hidden"
              animate="visible"
              variants={containerVariants}
              className="grid gap-6 lg:grid-cols-2"
            >
              <motion.div variants={itemVariants}>
                <Card>
                  <CardHeader className="pb-4">
                    <div className="flex items-center gap-3">
                      <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-emerald-500/10">
                        <Search className="h-4 w-4 text-emerald-600" />
                      </div>
                      <div>
                        <CardTitle className="text-base">素材搜索接口</CardTitle>
                        <CardDescription>配置白底图、详情参考图、SKU 参考图共用接口</CardDescription>
                      </div>
                    </div>
                  </CardHeader>
                  <CardContent className="space-y-4">
                    <div className="flex items-center justify-between rounded-lg border bg-muted/20 px-4 py-3">
                      <div>
                        <div className="text-sm font-medium">启用素材搜索</div>
                        <div className="text-xs text-muted-foreground">
                          开启后支持搜索白底素材图、详情参考图和 SKU 参考图
                        </div>
                      </div>
                      <Switch
                        checked={materialApiConfig.enabled}
                        onCheckedChange={(checked) =>
                          setMaterialApiConfig((prev) => ({ ...prev, enabled: checked }))
                        }
                      />
                    </div>

                    <div className="space-y-2">
                      <Label className="text-xs">接口基地址</Label>
                      <Input
                        value={materialApiConfig.baseUrl}
                        onChange={(e) =>
                          setMaterialApiConfig((prev) => ({ ...prev, baseUrl: e.target.value }))
                        }
                        placeholder="https://..."
                      />
                    </div>
                    <div className="space-y-2">
                      <Label className="text-xs">API Key</Label>
                      <Input
                        type="password"
                        value={materialApiConfig.apiKey}
                        onChange={(e) =>
                          setMaterialApiConfig((prev) => ({ ...prev, apiKey: e.target.value }))
                        }
                        placeholder="输入 API Key"
                      />
                    </div>
                  </CardContent>
                </Card>
              </motion.div>

              <motion.div variants={itemVariants}>
                <Card>
                  <CardHeader className="pb-4">
                    <div className="flex items-center gap-3">
                      <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-amber-500/10">
                        <Package className="h-4 w-4 text-amber-600" />
                      </div>
                      <div>
                        <CardTitle className="text-base">基础下拉选项</CardTitle>
                        <CardDescription>配置品牌与品牌下对应的店铺母子关系</CardDescription>
                      </div>
                    </div>
                  </CardHeader>
                  <CardContent className="space-y-4">
                    <div className="space-y-2">
                      <div className="flex items-center justify-between">
                        <Label className="text-xs">品牌树</Label>
                        <span className="text-xs text-muted-foreground">
                          {brandStoreEntries.length} 个品牌
                        </span>
                      </div>
                      <div className="rounded-xl border bg-muted/10 p-3">
                        <div className="flex flex-col gap-2 sm:flex-row">
                          <Input
                            value={brandDraft}
                            onChange={(e) => setBrandDraft(e.target.value)}
                            onKeyDown={(e) => {
                              if (e.key === "Enter") {
                                e.preventDefault();
                                handleAddBrandEntry();
                              }
                            }}
                            placeholder="输入一个品牌名称后点击添加"
                          />
                          <Button
                            type="button"
                            onClick={handleAddBrandEntry}
                            className="shrink-0"
                          >
                            <Plus className="mr-2 h-4 w-4" />
                            添加品牌
                          </Button>
                        </div>

                        {brandStoreEntries.length > 0 ? (
                          <div className="mt-4 space-y-4">
                            {brandStoreEntries.map((entry) => (
                              <div key={entry.brandName} className="rounded-xl border bg-background/80 p-4">
                                <div className="flex flex-wrap items-center justify-between gap-3">
                                  <div className="flex items-center gap-2">
                                    <div className="inline-flex items-center gap-2 rounded-full border bg-background px-3 py-1.5 text-sm font-medium">
                                      <span>{entry.brandName}</span>
                                      <button
                                        type="button"
                                        onClick={() => handleRemoveBrandEntry(entry.brandName)}
                                        className="rounded-full p-0.5 text-muted-foreground transition-colors hover:bg-muted hover:text-destructive"
                                        aria-label={`删除品牌 ${entry.brandName}`}
                                      >
                                        <Trash2 className="h-3.5 w-3.5" />
                                      </button>
                                    </div>
                                    <span className="text-xs text-muted-foreground">
                                      {entry.stores.length} 个店铺
                                    </span>
                                  </div>
                                </div>

                                <div className="mt-3 rounded-xl border bg-muted/20 p-3">
                                  <div className="flex flex-col gap-2 sm:flex-row">
                                    <Input
                                      value={storeDrafts[entry.brandName] || ""}
                                      onChange={(e) =>
                                        setStoreDrafts((prev) => ({
                                          ...prev,
                                          [entry.brandName]: e.target.value,
                                        }))
                                      }
                                      onKeyDown={(e) => {
                                        if (e.key === "Enter") {
                                          e.preventDefault();
                                          handleAddStoreToBrand(entry.brandName);
                                        }
                                      }}
                                      placeholder={`给品牌“${entry.brandName}”添加店铺`}
                                    />
                                    <Button
                                      type="button"
                                      onClick={() => handleAddStoreToBrand(entry.brandName)}
                                      className="shrink-0"
                                      variant="outline"
                                    >
                                      <Plus className="mr-2 h-4 w-4" />
                                      添加店铺
                                    </Button>
                                  </div>

                                  {entry.stores.length > 0 ? (
                                    <div className="mt-3 flex flex-wrap gap-2">
                                      {entry.stores.map((store) => (
                                        <div
                                          key={`${entry.brandName}-${store}`}
                                          className="inline-flex items-center gap-2 rounded-full border bg-background px-3 py-1.5 text-sm"
                                        >
                                          <span>{store}</span>
                                          <button
                                            type="button"
                                            onClick={() => handleRemoveStoreFromBrand(entry.brandName, store)}
                                            className="rounded-full p-0.5 text-muted-foreground transition-colors hover:bg-muted hover:text-destructive"
                                            aria-label={`删除店铺 ${store}`}
                                          >
                                            <Trash2 className="h-3.5 w-3.5" />
                                          </button>
                                        </div>
                                      ))}
                                    </div>
                                  ) : (
                                    <div className="mt-3 rounded-lg border border-dashed bg-background/70 px-3 py-4 text-sm text-muted-foreground">
                                      这个品牌下还没有添加任何店铺。
                                    </div>
                                  )}
                                </div>
                              </div>
                            ))}
                          </div>
                        ) : (
                          <div className="mt-3 rounded-lg border border-dashed bg-background/70 px-3 py-4 text-sm text-muted-foreground">
                            还没有添加品牌。先添加品牌，再在每个品牌下继续添加店铺。
                          </div>
                        )}
                      </div>
                    </div>
                  </CardContent>
                </Card>
              </motion.div>
            </motion.div>
          </TabsContent>

          {/* Models Tab */}
          <TabsContent value="models" className="space-y-6">
            <motion.div
              initial="hidden"
              animate="visible"
              variants={containerVariants}
            >
              <motion.div variants={itemVariants}>
                <Card>
                  <CardHeader>
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-3">
                        <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-rose-500/10">
                          <UserCircle className="h-4 w-4 text-rose-600" />
                        </div>
                        <div>
                          <CardTitle className="text-base">品牌模特图库</CardTitle>
                          <CardDescription>
                            为每个品牌配置模特图，第二步会按品牌展示供用户选择
                          </CardDescription>
                        </div>
                      </div>
                      <Badge variant="secondary">
                        {brandModelConfig.entries.length} 个品牌
                      </Badge>
                    </div>
                  </CardHeader>
                  <CardContent>
                    {brandModelBrands.length > 0 ? (
                      <div className="space-y-4">
                        {brandModelBrands.map((brandName, index) => {
                          const refKey = `brand-model:${brandName}`;
                          const entry = brandModelConfig.entries.find((e) => e.brandName === brandName);
                          const images = entry?.images || [];
                          const isUploading = uploadingKey === refKey;

                          return (
                            <motion.div
                              key={brandName}
                              initial={{ opacity: 0, y: 10 }}
                              animate={{ opacity: 1, y: 0 }}
                              transition={{ delay: index * 0.05 }}
                              className="rounded-xl border bg-card/50 p-4"
                            >
                              <div className="flex items-center justify-between gap-4">
                                <div className="flex items-center gap-3">
                                  <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-muted font-mono text-sm font-medium">
                                    {brandName.charAt(0)}
                                  </div>
                                  <div>
                                    <div className="font-medium">{brandName}</div>
                                    <div className="text-xs text-muted-foreground">
                                      {images.length} 张模特图
                                    </div>
                                  </div>
                                </div>
                                <input
                                  ref={(el) => { fileInputRefs.current[refKey] = el; }}
                                  type="file"
                                  accept="image/*"
                                  multiple
                                  className="hidden"
                                  onChange={(e) => {
                                    void handleUploadBrandModelImages(brandName, e.target.files);
                                    e.target.value = "";
                                  }}
                                />
                                <Button
                                  type="button"
                                  variant="outline"
                                  size="sm"
                                  onClick={() => fileInputRefs.current[refKey]?.click()}
                                  disabled={isUploading}
                                >
                                  {isUploading ? (
                                    <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                                  ) : (
                                    <Upload className="mr-2 h-4 w-4" />
                                  )}
                                  上传
                                </Button>
                              </div>

                              <AnimatePresence>
                                {images.length > 0 && (
                                  <motion.div
                                    initial={{ opacity: 0, height: 0 }}
                                    animate={{ opacity: 1, height: "auto" }}
                                    exit={{ opacity: 0, height: 0 }}
                                    className="mt-4 grid grid-cols-2 gap-3 sm:grid-cols-4 md:grid-cols-6"
                                  >
                                    {images.map((image) => (
                                      <div
                                        key={image.id}
                                        className="group relative aspect-square overflow-hidden rounded-lg border"
                                      >
                                        <img
                                          src={image.imageUrl}
                                          alt={image.displayName || `${brandName} 模特图`}
                                          className="h-full w-full object-cover"
                                        />
                                        <div className="absolute inset-0 bg-black/0 transition-colors group-hover:bg-black/40" />
                                        <button
                                          type="button"
                                          onClick={() => handleRemoveBrandModelImage(brandName, image.id)}
                                          className="absolute right-2 top-2 flex h-6 w-6 items-center justify-center rounded-full bg-white/90 text-destructive opacity-0 shadow-sm transition-opacity group-hover:opacity-100"
                                        >
                                          <Trash2 className="h-3 w-3" />
                                        </button>
                                      </div>
                                    ))}
                                  </motion.div>
                                )}
                              </AnimatePresence>
                            </motion.div>
                          );
                        })}
                      </div>
                    ) : (
                      <div className="flex flex-col items-center justify-center rounded-xl border border-dashed py-12">
                        <div className="flex h-12 w-12 items-center justify-center rounded-full bg-muted">
                          <Package className="h-6 w-6 text-muted-foreground" />
                        </div>
                        <p className="mt-4 text-sm text-muted-foreground">
                          先在"基础配置"中添加品牌，然后为每个品牌上传模特图
                        </p>
                      </div>
                    )}
                  </CardContent>
                </Card>
              </motion.div>
            </motion.div>
          </TabsContent>

          {/* Categories Tab */}
          <TabsContent value="categories" className="space-y-6">
            <motion.div
              initial="hidden"
              animate="visible"
              variants={containerVariants}
              className="space-y-4"
            >
              <motion.div variants={itemVariants} className="flex flex-wrap items-center justify-between gap-3">
                <div className="flex flex-wrap items-center gap-2">
                  <Badge variant="outline" className="font-mono">
                    {enabledPresetLibrarySectionCount} 分类页
                  </Badge>
                  <Badge variant="outline" className="font-mono">
                    {totalPresetLibraryNodeCount} 树节点
                  </Badge>
                  <Badge variant="secondary">“我的作品”固定保留，不在此处编辑</Badge>
                </div>
                <Button onClick={handleAddPresetLibrarySection} size="sm">
                  <Plus className="mr-2 h-4 w-4" />
                  新增分类页
                </Button>
              </motion.div>

              {sortedPresetLibrarySections.length > 0 ? (
                sortedPresetLibrarySections.map((section, index) =>
                  renderPresetLibrarySectionCard(section, index)
                )
              ) : (
                <motion.div variants={itemVariants}>
                  <Card>
                    <CardContent className="flex flex-col items-center justify-center py-16">
                      <div className="flex h-16 w-16 items-center justify-center rounded-full bg-muted">
                        <Package className="h-8 w-8 text-muted-foreground" />
                      </div>
                      <p className="mt-4 text-lg font-medium">还没有配置生图分类页</p>
                      <p className="text-sm text-muted-foreground">
                        点击上方按钮开始新增一个可展示的生图模式分类页
                      </p>
                    </CardContent>
                  </Card>
                </motion.div>
              )}
            </motion.div>
          </TabsContent>

          {/* Workflow Tab */}
          <TabsContent value="workflow" className="space-y-6">
            <motion.div
              initial="hidden"
              animate="visible"
              variants={containerVariants}
              className="space-y-4"
            >
              <motion.div variants={itemVariants} className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <Badge variant="outline" className="font-mono">
                    {countAgentWorkflowSteps(sortedSteps)} 模块
                  </Badge>
                  <Badge variant="outline" className="font-mono">
                    {countAgentWorkflowOptions(sortedSteps)} 选项
                  </Badge>
                </div>
                <Button onClick={() => handleAddStep()} size="sm">
                  <Plus className="mr-2 h-4 w-4" />
                  新增一级模块
                </Button>
              </motion.div>

              {sortedSteps.length > 0 ? (
                sortedSteps.map((step, stepIndex) =>
                  renderWorkflowStepCard(step, 1, [stepIndex + 1])
                )
              ) : (
                <motion.div variants={itemVariants}>
                  <Card>
                    <CardContent className="flex flex-col items-center justify-center py-16">
                      <div className="flex h-16 w-16 items-center justify-center rounded-full bg-muted">
                        <Layers className="h-8 w-8 text-muted-foreground" />
                      </div>
                      <p className="mt-4 text-lg font-medium">还没有配置工作流模块</p>
                      <p className="text-sm text-muted-foreground">
                        点击上方按钮开始创建第一个一级模块
                      </p>
                    </CardContent>
                  </Card>
                </motion.div>
              )}
            </motion.div>
          </TabsContent>
        </Tabs>
      </main>
    </div>
  );
}