"use client";

import {
  Clock3,
  Loader2,
  Sparkles,
  Upload,
} from "lucide-react";
import {
  type KeyboardEvent as ReactKeyboardEvent,
  type PointerEvent as ReactPointerEvent,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from "react";
import useSWR from "swr";
import { toast } from "sonner";
import { BrandTopBar } from "@/components/layout/brand-top-bar";
import { Button } from "@/components/ui/button";
import { imageGenerationService } from "@/services/canvas";
import { cn, fetcher } from "@/lib/utils";
import type {
  PublicStyleProCategory,
  PublicStyleProConfig,
  StyleProHistoryItem,
  StyleProPersistedState,
  StyleProSelectionMap,
} from "@/lib/style-pro/config";

type BrandingSettings = {
  siteName?: string;
  siteLogo?: string | null;
  siteLogoDark?: string | null;
};

type StyleProConfigResponse = {
  success: boolean;
  config?: PublicStyleProConfig;
  error?: string;
};

type StyleProGenerateResponse = {
  success: boolean;
  error?: string;
  data?: {
    imageUrl: string;
    thumbnailUrl?: string;
    model?: string;
    modelRef?: string;
    selections: StyleProSelectionMap;
    optionLabels: string[];
  };
};

type StyleProWorkspaceProps = {
  canvasId: string;
  initialSourceImageUrl?: string | null;
  persistedState?: StyleProPersistedState | null;
  onAddToCanvas?: (item: StyleProHistoryItem) => void | Promise<void>;
  onBack?: () => void;
  onPersistState?: (state: StyleProPersistedState) => void | Promise<void>;
};

function getHistoryId() {
  if (typeof crypto !== "undefined" && "randomUUID" in crypto) {
    return crypto.randomUUID();
  }
  return `style-pro-${Date.now()}-${Math.random().toString(36).slice(2)}`;
}

function loadImageDimensions(url: string) {
  return new Promise<{ width?: number; height?: number }>((resolve) => {
    if (typeof window === "undefined" || !url) {
      resolve({});
      return;
    }
    const image = new window.Image();
    image.onload = () => {
      resolve({
        width: image.naturalWidth || undefined,
        height: image.naturalHeight || undefined,
      });
    };
    image.onerror = () => resolve({});
    image.src = url;
  });
}

function normalizeHistory(history: StyleProHistoryItem[] | undefined) {
  return Array.isArray(history) ? history.slice(0, 4) : [];
}

function ImagePreview({
  alt,
  className,
  imageUrl,
}: {
  alt: string;
  className?: string;
  imageUrl?: string | null;
}) {
  if (!imageUrl) {
    return (
      <div
        className={cn(
          "flex h-full min-h-[220px] items-center justify-center rounded-lg border border-dashed border-gray-200 bg-gray-50 text-gray-400 text-sm",
          className
        )}
      >
        等待图片
      </div>
    );
  }

  return (
    <img
      alt={alt}
      className={cn("h-full w-full rounded-lg object-contain", className)}
      draggable={false}
      src={imageUrl}
    />
  );
}

function GeneratingImagePlaceholder() {
  return (
    <div className="min-h-[460px] rounded-lg border border-white/10 bg-white p-5 text-neutral-800">
      <div className="mb-4 flex items-center justify-between gap-3">
        <div>
          <div className="font-semibold text-[15px] text-neutral-700">
            正在创建图片
          </div>
          <div className="mt-1 text-xs text-neutral-400">
            正在理解图片与提示词组合
          </div>
        </div>
        <span className="inline-flex items-center gap-2 rounded-lg bg-neutral-100 px-3 py-1.5 text-xs font-medium text-neutral-500">
          <Loader2 className="h-3.5 w-3.5 animate-spin" />
          生成中
        </span>
      </div>
      <div className="style-pro-generating-frame relative mx-auto h-[390px] max-h-[58vh] w-full max-w-[340px] overflow-hidden rounded-[28px] p-[2px]">
        <div className="style-pro-generating-surface relative h-full overflow-hidden rounded-[26px] bg-[#f4f4f4]">
          <div className="style-pro-dot-field absolute inset-0" />
          <div className="style-pro-light-field absolute inset-0" />
        </div>
      </div>
      <style>{`
        @keyframes styleProBorderSpin {
          to { transform: rotate(1turn); }
        }
        @keyframes styleProDotDrift {
          0% { transform: translate3d(-10px, -8px, 0); opacity: 0.35; }
          45% { transform: translate3d(8px, 18px, 0); opacity: 0.78; }
          100% { transform: translate3d(18px, -4px, 0); opacity: 0.42; }
        }
        @keyframes styleProLightFloat {
          0% { transform: translate3d(-18%, -10%, 0) scale(1); opacity: 0.72; }
          50% { transform: translate3d(18%, 16%, 0) scale(1.06); opacity: 0.98; }
          100% { transform: translate3d(34%, -4%, 0) scale(1); opacity: 0.74; }
        }
        .style-pro-generating-frame {
          background: rgba(255,255,255,0.82);
          box-shadow: 0 18px 50px rgba(0,0,0,0.08);
          isolation: isolate;
        }
        .style-pro-generating-frame::before {
          position: absolute;
          content: "";
          inset: -42%;
          z-index: -1;
          background:
            conic-gradient(
              from 0deg,
              rgba(22, 163, 74, 0.18),
              rgba(37, 99, 235, 0.46),
              rgba(245, 158, 11, 0.32),
              rgba(20, 184, 166, 0.42),
              rgba(22, 163, 74, 0.18)
            );
          animation: styleProBorderSpin 5.2s linear infinite;
        }
        .style-pro-generating-frame::after {
          position: absolute;
          content: "";
          inset: 2px;
          border-radius: 26px;
          pointer-events: none;
          box-shadow:
            inset 0 0 0 1px rgba(255,255,255,0.72),
            inset 0 0 28px rgba(255,255,255,0.55);
        }
        .style-pro-generating-surface {
          box-shadow: inset 0 0 0 1px rgba(0,0,0,0.025);
        }
        .style-pro-dot-field {
          background-image: radial-gradient(circle, rgba(116,116,116,0.32) 1.05px, transparent 1.05px);
          background-size: 16px 16px;
          mask-image: radial-gradient(ellipse 88% 72% at 50% 44%, #000 0%, rgba(0,0,0,0.78) 48%, transparent 82%);
          animation: styleProDotDrift 3.8s ease-in-out infinite alternate;
        }
        .style-pro-light-field {
          background:
            radial-gradient(ellipse 52% 38% at 28% 28%, rgba(255,255,255,0.88) 0%, rgba(255,255,255,0.52) 38%, transparent 72%),
            radial-gradient(ellipse 56% 42% at 72% 70%, rgba(255,255,255,0.78) 0%, rgba(255,255,255,0.42) 36%, transparent 74%),
            radial-gradient(ellipse 90% 70% at 50% 50%, rgba(255,255,255,0.28) 0%, transparent 68%);
          filter: blur(14px);
          inset: -14%;
          mix-blend-mode: screen;
          animation: styleProLightFloat 4.4s ease-in-out infinite alternate;
          will-change: transform, opacity;
        }
      `}</style>
    </div>
  );
}

function BeforeAfterSlider({
  afterUrl,
  beforeUrl,
  generating = false,
}: {
  afterUrl?: string | null;
  beforeUrl?: string | null;
  generating?: boolean;
}) {
  const [position, setPosition] = useState(50);
  const sliderRef = useRef<HTMLDivElement | null>(null);
  const updatePositionFromClientX = useCallback((clientX: number) => {
    const rect = sliderRef.current?.getBoundingClientRect();
    if (!rect || rect.width <= 0) return;
    const next = ((clientX - rect.left) / rect.width) * 100;
    setPosition(Math.min(96, Math.max(4, Math.round(next * 10) / 10)));
  }, []);
  const handlePointerDown = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      event.currentTarget.setPointerCapture(event.pointerId);
      updatePositionFromClientX(event.clientX);
    },
    [updatePositionFromClientX]
  );
  const handlePointerMove = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      if (!event.currentTarget.hasPointerCapture(event.pointerId)) return;
      updatePositionFromClientX(event.clientX);
    },
    [updatePositionFromClientX]
  );
  const handlePointerEnd = useCallback(
    (event: ReactPointerEvent<HTMLDivElement>) => {
      if (event.currentTarget.hasPointerCapture(event.pointerId)) {
        event.currentTarget.releasePointerCapture(event.pointerId);
      }
    },
    []
  );
  const handleSliderKeyDown = useCallback(
    (event: ReactKeyboardEvent<HTMLDivElement>) => {
      const step = event.shiftKey ? 10 : 3;
      if (event.key === "ArrowLeft" || event.key === "ArrowDown") {
        event.preventDefault();
        setPosition((current) => Math.max(4, current - step));
      } else if (event.key === "ArrowRight" || event.key === "ArrowUp") {
        event.preventDefault();
        setPosition((current) => Math.min(96, current + step));
      } else if (event.key === "Home") {
        event.preventDefault();
        setPosition(4);
      } else if (event.key === "End") {
        event.preventDefault();
        setPosition(96);
      }
    },
    []
  );

  if (generating) {
    return <GeneratingImagePlaceholder />;
  }

  if (!beforeUrl && !afterUrl) {
    return (
      <div className="flex min-h-[460px] items-center justify-center rounded-lg border border-dashed border-gray-200 bg-gray-50 text-gray-400">
        上传图片后开始生成
      </div>
    );
  }

  if (!afterUrl) {
    return (
      <div className="min-h-[460px] rounded-lg border border-gray-200 bg-gray-50 p-3">
        <ImagePreview alt="上传图片" imageUrl={beforeUrl} />
      </div>
    );
  }

  return (
    <div
      className="relative min-h-[460px] select-none overflow-hidden rounded-lg border border-gray-200 bg-gray-50"
      ref={sliderRef}
    >
      <ImagePreview
        alt="生成后"
        className="absolute inset-0 h-full w-full"
        imageUrl={afterUrl}
      />
      <div
        className="absolute inset-0 overflow-hidden"
        style={{ clipPath: `inset(0 ${100 - position}% 0 0)` }}
      >
        <ImagePreview
          alt="生成前"
          className="h-full w-full"
          imageUrl={beforeUrl}
        />
      </div>
      <div
        className="absolute inset-y-0 w-px bg-white"
        style={{ left: `${position}%` }}
      >
        <div
          aria-label="拖动查看原图和结果对比"
          aria-valuemax={96}
          aria-valuemin={4}
          aria-valuenow={Math.round(position)}
          className="-translate-x-1/2 absolute top-1/2 flex h-11 w-11 -translate-y-1/2 cursor-ew-resize touch-none select-none items-center justify-center rounded-full border border-white/80 bg-black/75 text-[11px] font-semibold text-white shadow-lg outline-none transition hover:bg-black focus-visible:ring-2 focus-visible:ring-black/40 focus-visible:ring-offset-2"
          onKeyDown={handleSliderKeyDown}
          onPointerCancel={handlePointerEnd}
          onPointerDown={handlePointerDown}
          onPointerMove={handlePointerMove}
          onPointerUp={handlePointerEnd}
          role="slider"
          tabIndex={0}
        >
          对比
        </div>
      </div>
      <div className="absolute left-4 top-4 rounded-full bg-black/65 px-3 py-1 text-xs text-white/80">
        原图
      </div>
      <div className="absolute right-4 top-4 rounded-full bg-emerald-500/90 px-3 py-1 text-xs font-semibold text-black">
        结果
      </div>
    </div>
  );
}

export function StyleProWorkspace({
  canvasId,
  initialSourceImageUrl,
  onAddToCanvas,
  onPersistState,
  persistedState,
}: StyleProWorkspaceProps) {
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const { data: brandingData } = useSWR<BrandingSettings>(
    "/api/site-settings?scope=branding",
    fetcher
  );
  const { data: configData, isLoading: configLoading } =
    useSWR<StyleProConfigResponse>("/api/style-pro/config", fetcher);
  const config = configData?.config;
  const enabledCategories = useMemo(
    () =>
      (config?.categories || [])
        .filter((category) => category.enabled)
        .map((category) => ({
          ...category,
          options: category.options.filter((option) => option.enabled),
        }))
        .filter((category) => category.options.length > 0),
    [config?.categories]
  );

  const [sourceImageUrl, setSourceImageUrl] = useState(
    persistedState?.sourceImageUrl || initialSourceImageUrl || ""
  );
  const [currentResult, setCurrentResult] =
    useState<StyleProHistoryItem | null>(
      normalizeHistory(persistedState?.history)[0] || null
    );
  const [history, setHistory] = useState<StyleProHistoryItem[]>(
    normalizeHistory(persistedState?.history)
  );
  const [selections, setSelections] = useState<StyleProSelectionMap>({});
  const [uploading, setUploading] = useState(false);
  const [generating, setGenerating] = useState(false);

  useEffect(() => {
    const nextSource =
      persistedState?.sourceImageUrl || initialSourceImageUrl || "";
    setSourceImageUrl((current) => current || nextSource);
    const nextHistory = normalizeHistory(persistedState?.history);
    setHistory(nextHistory);
    setCurrentResult((current) => current || nextHistory[0] || null);
  }, [initialSourceImageUrl, persistedState?.history, persistedState?.sourceImageUrl]);

  const siteName = brandingData?.siteName || "由壹点AI";
  const logo = brandingData?.siteLogoDark || brandingData?.siteLogo || "";

  const selectedOptionLabels = useMemo(() => {
    const labels: string[] = [];
    for (const category of enabledCategories) {
      const selected = selections[category.id] || [];
      for (const optionId of selected) {
        const option = category.options.find((item) => item.id === optionId);
        if (option) {
          labels.push(`${category.title}：${option.label}`);
        }
      }
    }
    return labels;
  }, [enabledCategories, selections]);

  const missingRequiredCategories = useMemo(
    () =>
      enabledCategories.filter((category) => {
        if (!category.required && category.minSelections <= 0) return false;
        const selectedCount = selections[category.id]?.length || 0;
        return (
          selectedCount <
          Math.max(category.required ? 1 : 0, category.minSelections)
        );
      }),
    [enabledCategories, selections]
  );

  const persistState = useCallback(
    async (nextState: StyleProPersistedState) => {
      await onPersistState?.({
        sourceImageUrl: nextState.sourceImageUrl,
        history: normalizeHistory(nextState.history),
      });
    },
    [onPersistState]
  );

  const updateSourceImage = useCallback(
    async (url: string) => {
      const nextUrl = String(url || "").trim();
      setSourceImageUrl(nextUrl);
      setCurrentResult(null);
      await persistState({ sourceImageUrl: nextUrl, history });
    },
    [history, persistState]
  );

  const handleFile = useCallback(
    async (file: File | null | undefined) => {
      if (!file) return;
      if (!file.type.startsWith("image/")) {
        toast.error("请上传图片文件");
        return;
      }
      setUploading(true);
      try {
        const result = await imageGenerationService.uploadImage(file);
        if (!result.success || !result.data?.url) {
          throw new Error(result.error || "上传失败");
        }
        await updateSourceImage(result.data.url);
        toast.success("图片已上传");
      } catch (error) {
        toast.error(error instanceof Error ? error.message : "上传失败");
      } finally {
        setUploading(false);
      }
    },
    [updateSourceImage]
  );

  const toggleOption = useCallback(
    (category: PublicStyleProCategory, optionId: string) => {
      setSelections((current) => {
        const previous = current[category.id] || [];
        const selected = previous.includes(optionId);
        let nextSelected = selected
          ? previous.filter((id) => id !== optionId)
          : [...previous, optionId];
        if (!selected && category.maxSelections <= 1) {
          nextSelected = [optionId];
        }
        if (nextSelected.length > category.maxSelections) {
          nextSelected = nextSelected.slice(-category.maxSelections);
        }
        return {
          ...current,
          [category.id]: nextSelected,
        };
      });
    },
    []
  );

  const handleGenerate = useCallback(async () => {
    if (!sourceImageUrl) {
      toast.error("请先上传一张图片");
      return;
    }
    if (!config?.enabled) {
      toast.error("风格化 PRO 暂未启用");
      return;
    }
    if (missingRequiredCategories.length > 0) {
      toast.error(`请完成必选项：${missingRequiredCategories[0].title}`);
      return;
    }

    setGenerating(true);
    try {
      const response = await fetch("/api/style-pro/generate", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          canvasId,
          sourceImageUrl,
          selections,
        }),
      });
      const payload = (await response.json().catch(() => ({}))) as
        | StyleProGenerateResponse
        | undefined;
      if (!response.ok || !payload?.success || !payload.data?.imageUrl) {
        throw new Error(payload?.error || "生成失败");
      }
      const dimensions = await loadImageDimensions(payload.data.imageUrl);
      const item: StyleProHistoryItem = {
        id: getHistoryId(),
        sourceImageUrl,
        resultImageUrl: payload.data.imageUrl,
        selections: payload.data.selections || selections,
        optionLabels: payload.data.optionLabels || selectedOptionLabels,
        createdAt: new Date().toISOString(),
        model: payload.data.model,
        modelRef: payload.data.modelRef,
        width: dimensions.width,
        height: dimensions.height,
      };
      const nextHistory = [item, ...history.filter((entry) => entry.id !== item.id)].slice(
        0,
        4
      );
      setHistory(nextHistory);
      setCurrentResult(item);
      await persistState({ sourceImageUrl, history: nextHistory });
      toast.success("风格化 PRO 生成完成");
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "生成失败");
    } finally {
      setGenerating(false);
    }
  }, [
    canvasId,
    config?.enabled,
    history,
    missingRequiredCategories,
    persistState,
    selectedOptionLabels,
    selections,
    sourceImageUrl,
  ]);

  const restoreHistoryItem = useCallback((item: StyleProHistoryItem) => {
    setSourceImageUrl(item.sourceImageUrl);
    setSelections(item.selections || {});
    setCurrentResult(item);
  }, []);

  const disabledReason = !sourceImageUrl
    ? "请先上传图片"
    : missingRequiredCategories.length > 0
      ? `还差：${missingRequiredCategories[0].title}`
      : "";
  const promptDisplayMode = config?.promptDisplayMode || "stacked";
  const renderPromptCategory = (
    category: PublicStyleProCategory,
    layout: "stacked" | "carousel" = "stacked"
  ) => {
    const selectedIds = selections[category.id] || [];
    return (
      <div
        className={cn(
          "rounded-[20px] bg-black/[0.025] p-4",
          layout === "carousel" && "h-full min-h-[126px]"
        )}
      >
        <div className="mb-3 flex items-start gap-4">
          <span className="subsection-title mt-2 w-20 shrink-0">
            {category.title}
          </span>
          <div className="min-w-0 flex-1">
            <div className="flex flex-wrap gap-2">
              {category.options.map((option) => {
                const selected = selectedIds.includes(option.id);
                return (
                  <button
                    className={cn(
                      "option-btn rounded-full px-4 py-2 text-[14px] font-semibold",
                      selected && "active"
                    )}
                    key={option.id}
                    onClick={() => toggleOption(category, option.id)}
                    title={option.description || option.label}
                    type="button"
                  >
                    {option.label}
                  </button>
                );
              })}
            </div>
          </div>
        </div>
      </div>
    );
  };

  return (
    <div className="style-pro-index-shell flex h-dvh w-full overflow-hidden bg-[#f4f4f4] text-[#171717]">
      <style>{`
        .style-pro-index-shell .section-card {
          background: #fff;
          border: 1px solid rgba(0, 0, 0, 0.08);
          border-radius: 24px;
          box-shadow: 0 12px 35px rgba(15, 23, 42, 0.05);
        }
        .style-pro-index-shell .subsection-title {
          color: #2563eb;
          font-size: 13px;
          font-weight: 650;
          white-space: nowrap;
        }
        .style-pro-index-shell .option-btn {
          border: 1px solid rgba(0, 0, 0, 0.1);
          background: #fff;
          color: rgba(17, 24, 39, 0.78);
          transition: all 0.18s ease;
        }
        .style-pro-index-shell .option-btn:hover {
          background: #1c1c1e;
          border-color: #1c1c1e;
          color: #fff;
        }
        .style-pro-index-shell .option-btn.active {
          background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(37, 99, 235, 0.05));
          color: #2563eb;
          border-color: #60a5fa;
          box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
        }
        .style-pro-index-shell .prompt-carousel-scroll {
          scrollbar-width: thin;
          scrollbar-color: rgba(15, 23, 42, 0.18) transparent;
          scroll-padding-inline: 8px;
        }
        .style-pro-index-shell .prompt-carousel-scroll::-webkit-scrollbar {
          height: 8px;
        }
        .style-pro-index-shell .prompt-carousel-scroll::-webkit-scrollbar-track {
          background: transparent;
        }
        .style-pro-index-shell .prompt-carousel-scroll::-webkit-scrollbar-thumb {
          background: rgba(15, 23, 42, 0.16);
          border-radius: 999px;
        }
      `}</style>

      <main className="min-w-0 flex-1 overflow-y-auto">
        <BrandTopBar
          logo={logo}
          onLogoClick={() => {
            window.location.href = "/";
          }}
          position="sticky"
          siteName={siteName}
        />

        <div className="mx-auto max-w-[1920px] space-y-5 px-6 py-6">
          <section className="section-card p-6">
            <div className="rounded-[20px] bg-black/[0.025] p-4">
              <div className="mb-3 flex items-center justify-between gap-3">
                <span className="subsection-title">上传图片</span>
                <span className="text-[12px] text-black/40">支持拖拽上传</span>
              </div>
              <button
                className="flex min-h-[260px] w-full items-center justify-center overflow-hidden rounded-2xl border border-dashed border-black/15 bg-white transition hover:border-black/35"
                onClick={() => fileInputRef.current?.click()}
                onDragOver={(event) => event.preventDefault()}
                onDrop={(event) => {
                  event.preventDefault();
                  void handleFile(event.dataTransfer.files?.[0]);
                }}
                type="button"
              >
                {sourceImageUrl ? (
                  <img
                    alt="上传图片"
                    className="h-full max-h-[360px] w-full object-contain"
                    src={sourceImageUrl}
                  />
                ) : (
                  <span className="flex flex-col items-center gap-3 text-gray-500">
                    {uploading ? (
                      <Loader2 className="h-6 w-6 animate-spin" />
                    ) : (
                      <Upload className="h-6 w-6" />
                    )}
                    <span className="text-[13px]">点击上传，或拖入图片</span>
                  </span>
                )}
              </button>
              <input
                accept="image/*"
                className="hidden"
                onChange={(event) => {
                  void handleFile(event.target.files?.[0]);
                  event.currentTarget.value = "";
                }}
                ref={fileInputRef}
                type="file"
              />
            </div>
          </section>

          {configLoading ? (
            <section className="section-card flex min-h-[180px] items-center justify-center p-6 text-[13px] text-black/45">
              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
              正在加载配置
            </section>
          ) : !config?.enabled ? (
            <section className="section-card border-amber-200 bg-amber-50 p-6 text-amber-800">
              风格化 PRO 暂未启用，请联系管理员开启。
            </section>
          ) : promptDisplayMode === "carousel" ? (
            <section className="section-card p-6">
              <div className="prompt-carousel-scroll -mx-2 flex snap-x gap-4 overflow-x-auto px-2 pb-2">
                {enabledCategories.map((category) => (
                  <div
                    className="w-[min(760px,calc(100vw-96px))] shrink-0 snap-start"
                    key={category.id}
                  >
                    {renderPromptCategory(category, "carousel")}
                  </div>
                ))}
              </div>
            </section>
          ) : (
            enabledCategories.map((category) => (
              <section className="section-card p-6" key={category.id}>
                {renderPromptCategory(category)}
              </section>
            ))
          )}

          <section className="section-card p-6">
            <div className="grid gap-6 xl:grid-cols-[minmax(0,1fr)_360px]">
              <div className="rounded-[20px] bg-black/[0.025] p-4">
                <div className="mb-4 flex flex-wrap items-center justify-between gap-3">
                  <div>
                    <span className="subsection-title">生图结果</span>
                    <p className="mt-1 text-[13px] text-black/45">
                      生成后拖动滑块查看原图与结果图。
                    </p>
                  </div>
                  <div className="flex flex-wrap gap-2">
                    <Button
                      className="h-8 rounded-[14px] bg-[#1c1c1e] px-4 text-[12px] text-white hover:bg-black"
                      disabled={generating || Boolean(disabledReason)}
                      onClick={handleGenerate}
                    >
                      {generating ? (
                        <Loader2 className="mr-1.5 h-3.5 w-3.5 animate-spin" />
                      ) : (
                        <Sparkles className="mr-1.5 h-3.5 w-3.5" />
                      )}
                      {generating ? "正在创建图片" : "执行"}
                    </Button>
                    <Button
                      className="h-8 rounded-[14px] border-black/10 bg-white px-4 text-[12px] text-black/70 shadow-sm hover:bg-black/5"
                      disabled={!currentResult}
                      onClick={() => currentResult && onAddToCanvas?.(currentResult)}
                      variant="outline"
                    >
                      添加到画布
                    </Button>
                  </div>
                </div>
                <BeforeAfterSlider
                  afterUrl={currentResult?.resultImageUrl}
                  beforeUrl={currentResult?.sourceImageUrl || sourceImageUrl}
                  generating={generating}
                />
              </div>

              <div className="rounded-[20px] bg-black/[0.025] p-4">
                <div className="mb-3 flex items-center justify-between gap-3">
                  <span className="subsection-title">历史记录</span>
                  <span className="text-[12px] text-black/40">最近 4 条</span>
                </div>
                <div className="grid grid-cols-2 gap-3">
                  {history.length > 0 ? (
                    history.map((item) => (
                      <button
                        className={cn(
                          "overflow-hidden rounded-2xl border bg-white text-left transition hover:border-black/35",
                          currentResult?.id === item.id
                            ? "border-black/30 shadow-[0_4px_12px_rgba(15,23,42,0.12)]"
                            : "border-black/10"
                        )}
                        key={item.id}
                        onClick={() => restoreHistoryItem(item)}
                        type="button"
                      >
                        <div className="aspect-square bg-gray-100">
                          <img
                            alt="风格化历史"
                            className="h-full w-full object-cover"
                            src={item.resultImageUrl}
                          />
                        </div>
                        <div className="space-y-1 p-2">
                          <div className="flex items-center gap-1 text-[11px] text-gray-400">
                            <Clock3 className="h-3 w-3" />
                            {new Date(item.createdAt).toLocaleTimeString("zh-CN", {
                              hour: "2-digit",
                              minute: "2-digit",
                            })}
                          </div>
                          <div className="line-clamp-1 text-[12px] text-black/70">
                            {item.optionLabels[0] || "风格化结果"}
                          </div>
                        </div>
                      </button>
                    ))
                  ) : (
                    <div className="col-span-2 rounded-2xl border border-dashed border-black/15 bg-white p-5 text-center text-[13px] text-black/40">
                      生成后会在这里保存历史。
                    </div>
                  )}
                </div>
              </div>
            </div>
          </section>
        </div>
      </main>
    </div>
  );
}