"use client";

import { useCallback, useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { AdminSegmented } from "@/components/admin";
import type { EconomyStats, PublicSettings } from "@/lib/api";
import EconomyOverview from "./EconomyOverview";
import EconomySettings from "../settings/EconomySettings";
import UserPointsTab from "./UserPointsTab";

type TabKey = "overview" | "rules" | "users";

const TAB_OPTIONS = [
  { key: "overview", label: "经济总览" },
  { key: "rules", label: "积分规则" },
  { key: "users", label: "用户积分" },
];

/**
 * 积分管理页标签壳：经济总览（管理员及以上）/ 积分规则 + 用户积分（超管/站长）。
 * tab 记在 URL query（?tab=）便于刷新/分享保持；三个面板保持挂载、用 display 切换，
 * 避免切标签丢失规则的未保存修改与用户列表状态。
 */
export default function PointsTabs({
  stats,
  settings,
  canManage,
}: {
  stats: EconomyStats | null;
  settings: PublicSettings | null;
  canManage: boolean;
}) {
  const router = useRouter();
  const searchParams = useSearchParams();
  const queryTab = searchParams.get("tab");
  const [tab, setTab] = useState<TabKey>(() => {
    const t = queryTab;
    if (canManage && (t === "rules" || t === "users")) return t;
    return "overview";
  });

  const switchTab = useCallback(
    (next: string) => {
      setTab(next as TabKey);
      const params = new URLSearchParams(searchParams.toString());
      if (next === "overview") params.delete("tab");
      else params.set("tab", next);
      const qs = params.toString();
      router.replace(qs ? `?${qs}` : "?", { scroll: false });
    },
    [router, searchParams]
  );

  const options = canManage
    ? TAB_OPTIONS
    : TAB_OPTIONS.filter((o) => o.key === "overview");

  return (
    <div className={tab === "users" ? "admin-points-users-tab" : undefined}>
      {canManage ? (
        <div className="mb-4">
          <AdminSegmented
            options={options}
            value={tab}
            onChange={(v) => switchTab(String(v))}
            ariaLabel="积分管理标签"
          />
        </div>
      ) : null}

      {/* 各面板保持挂载（display 切换）：规则未保存修改与用户列表状态不因切标签丢失 */}
      <div style={tab === "overview" ? undefined : { display: "none" }}>
        {stats ? (
          <EconomyOverview stats={stats} />
        ) : (
          <div className="panel p-8 text-center">
            <p className="meta">暂时无法加载积分数据</p>
          </div>
        )}
      </div>
      {canManage ? (
        <>
          <div style={tab === "rules" ? undefined : { display: "none" }}>
            {settings ? <EconomySettings initial={settings} /> : null}
          </div>
          <div style={tab === "users" ? undefined : { display: "none" }}>
            <UserPointsTab />
          </div>
        </>
      ) : null}
    </div>
  );
}