import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { auth } from "@/app/(auth)/auth";
import { ChatSDKError } from "@/lib/errors";
import {
  createAgentPreset,
  getSystemSetting,
  getVisibleAgentPresets,
} from "@/lib/db/queries";
import {
  AGENT_SECONDARY_TYPE_CONFIG_KEY,
  isValidSecondaryTypeForPresetType,
  normalizeAgentSecondaryTypeConfig,
} from "@/lib/agents/secondary-type-config";

const listQuerySchema = z.object({
  scope: z.enum(["all", "public", "private"]).default("all"),
  type: z.enum(["image", "video", "text"]).optional(),
  sectionId: z.string().trim().max(64).optional(),
  level1Id: z.string().trim().max(64).optional(),
  level2Id: z.string().trim().max(64).optional(),
  level3Id: z.string().trim().max(64).optional(),
  productCategory: z.string().trim().max(64).optional(),
  audienceTag: z.string().trim().max(64).optional(),
  usageScenario: z.string().trim().max(64).optional(),
  brand: z.string().trim().max(64).optional(),
  keyword: z.string().trim().max(128).optional(),
  sort: z.enum(["latest", "hottest", "most_used"]).default("latest"),
});

const slotSchema = z.object({
  title: z.string().trim().max(128).optional(),
  promptTemplate: z.string().trim().min(1).max(8000),
  defaultParams: z.record(z.string(), z.any()).optional(),
  requireUpload: z.boolean().optional(),
  uploadLabel: z.string().trim().max(128).optional(),
  referenceAssetIds: z.array(z.string().uuid()).max(12).optional(),
});

const createAgentSchema = z
  .object({
    name: z.string().trim().min(1).max(128),
    type: z.enum(["image", "video", "text"]),
    secondaryType: z.string().trim().max(128).optional(),
    visibility: z.enum(["public", "private"]).default("private"),
    categoryPath: z
      .object({
        sectionId: z.string().trim().max(64).optional(),
        sectionName: z.string().trim().max(64).optional(),
        level1Id: z.string().trim().max(64).optional(),
        level1Name: z.string().trim().max(64).optional(),
        level2Id: z.string().trim().max(64).optional(),
        level2Name: z.string().trim().max(64).optional(),
        level3Id: z.string().trim().max(64).optional(),
        level3Name: z.string().trim().max(64).optional(),
        productCategory: z.string().trim().max(64).optional(),
        audienceTag: z.string().trim().max(64).optional(),
        usageScenario: z.string().trim().max(64).optional(),
        brand: z.string().trim().max(64).optional(),
      })
      .optional(),
    description: z.string().trim().max(2000).optional(),
    defaultModelId: z.string().uuid(),
    defaultParams: z.record(z.string(), z.any()).optional(),
    avatarAssetId: z.string().uuid().optional(),
    slots: z.array(slotSchema).min(1).max(20),
  });

export async function GET(request: NextRequest) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { searchParams } = new URL(request.url);
    const query = listQuerySchema.parse({
      scope: searchParams.get("scope") || "all",
      type: searchParams.get("type") || undefined,
      sectionId: searchParams.get("sectionId") || undefined,
      level1Id: searchParams.get("level1Id") || undefined,
      level2Id: searchParams.get("level2Id") || undefined,
      level3Id: searchParams.get("level3Id") || undefined,
      productCategory: searchParams.get("productCategory") || undefined,
      audienceTag: searchParams.get("audienceTag") || undefined,
      usageScenario: searchParams.get("usageScenario") || undefined,
      brand: searchParams.get("brand") || undefined,
      keyword: searchParams.get("keyword") || undefined,
      sort: searchParams.get("sort") || "latest",
    });

    const presets = await getVisibleAgentPresets({
      userId: session.user.id,
      scope: query.scope,
      type: query.type,
      keyword: query.keyword,
      sort: query.sort,
    });

    const filterByPath = (items: typeof presets) =>
      items.filter((item) => {
        const path = item.categoryPath || {};
        if (query.sectionId && path.sectionId !== query.sectionId) return false;
        if (query.level1Id && path.level1Id !== query.level1Id) return false;
        if (query.level2Id && path.level2Id !== query.level2Id) return false;
        if (query.level3Id && path.level3Id !== query.level3Id) return false;
        if (query.productCategory && path.productCategory !== query.productCategory) return false;
        if (query.audienceTag && path.audienceTag !== query.audienceTag) return false;
        if (query.usageScenario && path.usageScenario !== query.usageScenario) return false;
        if (query.brand && path.brand !== query.brand) return false;
        return true;
      });

    return NextResponse.json({
      success: true,
      data: {
        categories: [],
        public: filterByPath(presets.filter((item) => item.visibility === "public")),
        private: filterByPath(presets.filter((item) => item.visibility === "private")),
      },
    });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { success: false, error: error.message },
        { status: 400 }
      );
    }
    return NextResponse.json(
      { success: false, error: "获取风格化列表失败" },
      { status: 500 }
    );
  }
}

export async function POST(request: NextRequest) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const body = await request.json();
    const data = createAgentSchema.parse(body);
    const secondaryTypeConfig = normalizeAgentSecondaryTypeConfig(
      (
        await getSystemSetting({ key: AGENT_SECONDARY_TYPE_CONFIG_KEY }).catch(() => undefined)
      )?.value
    );

    if (
      !isValidSecondaryTypeForPresetType({
        presetType: data.type,
        secondaryType: data.secondaryType,
        config: secondaryTypeConfig,
      })
    ) {
      return NextResponse.json(
        { success: false, error: "所选二级类型不在后台配置列表中" },
        { status: 400 }
      );
    }

    const preset = await createAgentPreset({
      userId: session.user.id,
      name: data.name,
      type: data.type,
      secondaryType: data.secondaryType,
      visibility: data.visibility,
      categoryPath: data.categoryPath,
      description: data.description,
      defaultModelId: data.defaultModelId,
      defaultParams: data.defaultParams,
      avatarAssetId: data.avatarAssetId,
      slots: data.slots,
    });

    return NextResponse.json({ success: true, data: preset });
  } catch (error) {
    if (error instanceof ChatSDKError) {
      return error.toResponse();
    }
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { success: false, error: error.message },
        { status: 400 }
      );
    }
    return NextResponse.json(
      { success: false, error: "创建风格化失败" },
      { status: 500 }
    );
  }
}