import { NextRequest, NextResponse } from "next/server";
import { z } from "zod";
import { auth } from "@/app/(auth)/auth";
import { ChatSDKError } from "@/lib/errors";
import {
  createAgentPreset,
  getVisibleAgentCategories,
  getVisibleAgentPresets,
} from "@/lib/db/queries";

const listQuerySchema = z.object({
  scope: z.enum(["all", "public", "private"]).default("all"),
  type: z.enum(["image", "video"]).optional(),
  categoryId: z.string().uuid().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"]),
    visibility: z.enum(["public", "private"]).default("private"),
    categoryId: z.string().uuid().optional(),
    newCategoryName: z.string().trim().min(1).max(64).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),
  })
  .superRefine((value, ctx) => {
    if (value.categoryId && value.newCategoryName) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: "categoryId 和 newCategoryName 不能同时传入",
        path: ["newCategoryName"],
      });
    }
    if (value.visibility === "public" && !value.categoryId && !value.newCategoryName) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: "公开智能体必须选择分类或新建分类",
        path: ["categoryId"],
      });
    }
  });

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,
      categoryId: searchParams.get("categoryId") || undefined,
      keyword: searchParams.get("keyword") || undefined,
      sort: searchParams.get("sort") || "latest",
    });

    const [presets, categories] = await Promise.all([
      getVisibleAgentPresets({
        userId: session.user.id,
        scope: query.scope,
        type: query.type,
        categoryId: query.categoryId,
        keyword: query.keyword,
        sort: query.sort,
      }),
      getVisibleAgentCategories({
        userId: session.user.id,
        scope: query.scope === "private" ? "private" : "all",
      }),
    ]);

    return NextResponse.json({
      success: true,
      data: {
        categories,
        public: presets.filter((item) => item.visibility === "public"),
        private: 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: "获取智能体列表失败" },
      { 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 preset = await createAgentPreset({
      userId: session.user.id,
      name: data.name,
      type: data.type,
      visibility: data.visibility,
      categoryId: data.categoryId,
      newCategoryName: data.newCategoryName,
      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: "创建智能体失败" },
      { status: 500 }
    );
  }
}