import { NextResponse } from "next/server";
import { db } from "@/lib/db";
import { generatedImage, user } from "@/lib/db/schema";
import { eq, desc, sql } from "drizzle-orm";
import { auth } from "@/app/(auth)/auth";

// GET: 获取精选榜单（前5名用户）
export async function GET() {
  try {
    const session = await auth();

    if (!session?.user?.id) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    // 查询精选数量排行榜
    const ranking = await db
      .select({
        userId: generatedImage.userId,
        userName: user.name,
        userEmail: user.email,
        userDepartment: user.department,
        featuredCount: sql<number>`count(*)::int`,
      })
      .from(generatedImage)
      .leftJoin(user, eq(generatedImage.userId, user.id))
      .where(eq(generatedImage.isFeatured, true))
      .groupBy(generatedImage.userId, user.name, user.email, user.department)
      .orderBy(desc(sql`count(*)`))
      .limit(5);

    return NextResponse.json({
      ranking: ranking.map((item, index) => ({
        rank: index + 1,
        userId: item.userId,
        userName: item.userName || item.userEmail?.split("@")[0] || "未知用户",
        department: item.userDepartment || "未设置部门",
        featuredCount: item.featuredCount,
      })),
    });
  } catch (error) {
    console.error("[Featured Ranking API] Error:", error);
    return NextResponse.json({ error: "Failed to fetch ranking" }, { status: 500 });
  }
}