import { NextRequest, NextResponse } from "next/server";
import { getAdminToken } from "@/app/lib/pocketbase/admin";
import { getPocketBaseConfig } from "@/config/services.config";
import { SESSIONS } from "@/config/home.config";

/** 按场次返回报名人数和最近报名者（昵称），头像由前端用 initials 或占位 */
export async function GET(request: NextRequest) {
  const token = await getAdminToken();
  if (!token) {
    return NextResponse.json(
      { ok: true, stats: getEmptyStats() },
      { status: 200 }
    );
  }

  const pb = getPocketBaseConfig();
  const base = pb.url.replace(/\/$/, "");

  const stats: Record<string, { count: number; joiners: { nickname: string; avatar?: string; xiaohongshu_url?: string }[] }> = {};

  const results = await Promise.all(
    SESSIONS.map(async (s) => {
      try {
        const filter = encodeURIComponent(`type="${s.id}"`);
        const res = await fetch(
          `${base}/api/collections/${pb.joinCollection}/records?filter=${filter}&sort=-created&perPage=6`,
          {
            headers: { Authorization: `Bearer ${token}` },
            cache: "no-store",
          }
        );
        if (!res.ok) return { id: s.id, stat: { count: 0, joiners: [] } };
        const data = await res.json();
        const items = Array.isArray(data?.items) ? data.items : [];
        const total = typeof data?.totalItems === "number" ? data.totalItems : items.length;
        return {
          id: s.id,
          stat: {
            count: total,
            joiners: items.slice(0, 6).map((r: { nickname?: string; xiaohongshu_nickname?: string; xiaohongshu_avatar?: string; xiaohongshu_url?: string; media?: string }) => ({
              nickname: String(r?.xiaohongshu_nickname || r?.nickname || "").trim() || "匿名",
              avatar: String(r?.xiaohongshu_avatar || r?.media || "").trim() || undefined,
              xiaohongshu_url: String(r?.xiaohongshu_url || "").trim() || undefined,
            })),
          },
        };
      } catch {
        return { id: s.id, stat: { count: 0, joiners: [] } };
      }
    })
  );

  for (const { id, stat } of results) {
    stats[id] = stat;
  }

  return NextResponse.json({ ok: true, stats });
}

function getEmptyStats() {
  const stats: Record<string, { count: number; joiners: { nickname: string; avatar?: string; xiaohongshu_url?: string }[] }> = {};
  for (const s of SESSIONS) {
    stats[s.id] = { count: 0, joiners: [] };
  }
  return stats;
}