import type { Metadata } from "next";
import Link from "next/link";
import { cookies } from "next/headers";
import { Coins, Flame, Gift, Layers } from "lucide-react";
import { fetchAdminEconomyStats } from "@/lib/api";
import { authCookieHeader } from "@/lib/cookies";
import { getMeCached } from "@/lib/serverData";
import { isAdminOrAbove } from "@/lib/roles";
import { postTypeLabel } from "@/lib/postMeta";
import { pointReasonLabel } from "@/lib/points";
import { formatRelative } from "@/lib/format";
import { AdminPageHeader, AdminStatCard } from "@/components/admin";
import Forbidden from "../Forbidden";

export const metadata: Metadata = {
  title: "积分看板",
};

const fmt = (n: number) => n.toLocaleString("zh-CN");

export default async function AdminEconomyPage() {
  const cookie = authCookieHeader(await cookies());
  const me = await getMeCached(cookie || undefined);
  if (!me.user || !isAdminOrAbove(me.user.role)) {
    return <Forbidden text="积分看板仅管理员及以上可查看。" />;
  }

  let stats: Awaited<ReturnType<typeof fetchAdminEconomyStats>> | null = null;
  try {
    stats = await fetchAdminEconomyStats(cookie);
  } catch {
    stats = null;
  }

  if (!stats) {
    return (
      <div className="panel p-8 text-center">
        <p className="meta">暂时无法加载积分数据</p>
      </div>
    );
  }

  const typeEntries = Object.entries(stats.posts_by_type || {}).sort(
    (a, b) => b[1] - a[1]
  );

  return (
    <div>
      <AdminPageHeader
        icon={Coins}
        title="积分与类型帖看板"
        description="观察全站积分流通、悬赏托管与帖子类型分布"
      />

      <div className="grid grid-cols-1 sm:grid-cols-2 xl:grid-cols-4 gap-3 mb-5">
        <AdminStatCard
          label="用户余额合计"
          value={fmt(stats.total_balance)}
          hint="全站可用积分之和"
          icon={<Coins size={16} />}
        />
        <AdminStatCard
          label="今日签到"
          value={fmt(stats.checkin_today)}
          hint="今日已签到人数"
          icon={<Flame size={16} />}
          color="var(--clay)"
          soft="var(--clay-soft)"
        />
        <AdminStatCard
          label="托管中悬赏"
          value={`${fmt(stats.open_bounties)} / ${fmt(stats.escrowed_points)}`}
          hint="未结算帖数 / 托管积分"
          icon={<Gift size={16} />}
          color="var(--gold)"
          soft="var(--gold-soft)"
        />
        <AdminStatCard
          label="流水条数"
          value={fmt(stats.ledger_count)}
          hint="历史入账出账记录"
          icon={<Layers size={16} />}
        />
      </div>

      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <section className="panel overflow-hidden">
          <div
            className="px-5 py-3.5 font-medium text-[15px]"
            style={{ borderBottom: "1px solid var(--line)", color: "var(--ink)" }}
          >
            帖子类型分布
          </div>
          {typeEntries.length === 0 ? (
            <p className="meta text-center py-10">暂无数据</p>
          ) : (
            <ul>
              {typeEntries.map(([t, n], idx) => (
                <li
                  key={t}
                  className="px-5 py-3 flex items-center justify-between"
                  style={idx === 0 ? undefined : { borderTop: "1px solid var(--line)" }}
                >
                  <span className="text-[14px]" style={{ color: "var(--ink)" }}>
                    {postTypeLabel(t)}
                  </span>
                  <span className="tabular-nums meta">{fmt(n)}</span>
                </li>
              ))}
            </ul>
          )}
        </section>

        <section className="panel overflow-hidden">
          <div
            className="px-5 py-3.5 font-medium text-[15px]"
            style={{ borderBottom: "1px solid var(--line)", color: "var(--ink)" }}
          >
            最近流水
          </div>
          {(stats.recent_ledger || []).length === 0 ? (
            <p className="meta text-center py-10">暂无流水</p>
          ) : (
            <ul>
              {stats.recent_ledger.map((it, idx) => (
                <li
                  key={it.id}
                  className="px-5 py-3 flex items-start justify-between gap-3"
                  style={idx === 0 ? undefined : { borderTop: "1px solid var(--line)" }}
                >
                  <div className="min-w-0">
                    <p className="text-[13.5px] truncate" style={{ color: "var(--ink)" }}>
                      {pointReasonLabel(it.reason)}
                      {it.note ? ` · ${it.note}` : ""}
                    </p>
                    <p className="meta text-[12px] mt-0.5">{formatRelative(it.created_at)}</p>
                  </div>
                  <span
                    className="tabular-nums font-medium shrink-0"
                    style={{ color: it.delta >= 0 ? "var(--accent)" : "var(--danger)" }}
                  >
                    {it.delta >= 0 ? `+${it.delta}` : it.delta}
                  </span>
                </li>
              ))}
            </ul>
          )}
        </section>
      </div>

      <p className="meta text-[12.5px] mt-5">
        用户可在{" "}
        <Link href="/points" className="hover:text-[var(--accent)]">
          /points
        </Link>{" "}
        查看个人流水。
      </p>
    </div>
  );
}