"use client";

import { useEffect, useState } from "react";
import { getUsageSummary, listAuditLogs, listTtsTasks } from "@/lib/admin";
import { BrandIcon } from "@/components/brand-icon";
import { StatusCard } from "@/components/ui";

type Task = {
  id: string;
  user_id: string;
  user_email: string;
  status: string;
  text_length: number;
  provider_voice_id: string;
  error_code: string | null;
  attempt_count: number;
  reserved_amount: number;
  created_at: string;
  started_at: string | null;
  finished_at: string | null;
  duration_ms: number | null;
  settlement: string;
  reserved: number;
  used: number;
};

type Audit = {
  id: string;
  actor_email: string | null;
  action: string;
  target_type: string;
  target_id: string;
  before_value: Record<string, unknown> | null;
  after_value: Record<string, unknown> | null;
  reason: string;
  created_at: string;
};

type Summary = { tasks: { total: number; by_status: Record<string, number>; failed: number }; quota: { used: number; reserved: number; adjustment: number }; ledger_total: number };

const statusLabel: Record<string, string> = { queued: "排队", running: "进行中", succeeded: "成功", failed: "失败" };
const settleLabel: Record<string, string> = { consumed: "已消费", released: "已释放", pending: "待结算" };
const actionLabel: Record<string, string> = {
  user_status: "用户状态变更",
  membership: "授予/变更会员",
  membership_revoke: "撤销会员",
  quota_adjustment: "额度调整",
};

export function TtsAuditPanel() {
  const [tab, setTab] = useState<"tasks" | "audit">("tasks");
  const [status, setStatus] = useState("");
  const [taskPage, setTaskPage] = useState(1);
  const [tasks, setTasks] = useState<Task[]>([]);
  const [taskTotal, setTaskTotal] = useState(0);
  const [taskPages, setTaskPages] = useState(1);
  const [auditPage, setAuditPage] = useState(1);
  const [audits, setAudits] = useState<Audit[]>([]);
  const [auditTotal, setAuditTotal] = useState(0);
  const [auditPages, setAuditPages] = useState(1);
  const [summary, setSummary] = useState<Summary | null>(null);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");

  async function loadTasks(p = taskPage) {
    setLoading(true);
    setError("");
    try {
      const res = await listTtsTasks({ status, page: p, limit: 20 });
      setTasks(res.items as unknown as Task[]);
      setTaskTotal(res.total);
      setTaskPages(res.pages);
      setTaskPage(res.page);
    } catch (e) {
      setError(e instanceof Error ? e.message : "加载失败");
    } finally {
      setLoading(false);
    }
  }

  async function loadAudit(p = auditPage) {
    setLoading(true);
    setError("");
    try {
      const res = await listAuditLogs({ page: p, limit: 30 });
      setAudits(res.items as unknown as Audit[]);
      setAuditTotal(res.total);
      setAuditPages(res.pages);
      setAuditPage(res.page);
    } catch (e) {
      setError(e instanceof Error ? e.message : "加载失败");
    } finally {
      setLoading(false);
    }
  }

  useEffect(() => {
    void loadTasks(1);
    void getUsageSummary().then(setSummary).catch(() => undefined);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  function switchTab(next: "tasks" | "audit") {
    setTab(next);
    if (next === "tasks") void loadTasks(1);
    else void loadAudit(1);
  }

  return (
    <div className="space-y-6">
      {summary ? (
        <div className="grid gap-5 md:grid-cols-4">
          <StatusCard title="任务总数" description={`${summary.tasks.total}`} />
          <StatusCard title="成功" description={`${summary.tasks.by_status.succeeded ?? 0}`} tone="success" />
          <StatusCard title="失败" description={`${summary.tasks.failed}`} tone="warning" />
          <StatusCard title="额度账本" description={summary.ledger_total.toLocaleString()} tone="info" />
        </div>
      ) : null}

      <div className="flex gap-2">
        <button className={`rounded-lg px-4 py-2 text-sm font-semibold ${tab === "tasks" ? "bg-blue/10 text-cyan" : "text-muted hover:text-copy"}`} onClick={() => switchTab("tasks")} type="button">
          任务查询
        </button>
        <button className={`rounded-lg px-4 py-2 text-sm font-semibold ${tab === "audit" ? "bg-blue/10 text-cyan" : "text-muted hover:text-copy"}`} onClick={() => switchTab("audit")} type="button">
          管理员审计
        </button>
      </div>

      {error ? <div className="rounded-lg border border-danger/30 bg-danger/10 p-3 text-sm text-danger">{error}</div> : null}

      {tab === "tasks" ? (
        <div className="rounded-2xl border border-line bg-panel/50">
          <div className="grid gap-3 border-b border-line p-5 sm:grid-cols-[1fr_auto]">
            <select aria-label="按状态筛选" className="field-input" onChange={(e) => setStatus(e.target.value)} value={status}>
              <option value="">全部状态</option>
              <option value="queued">排队</option>
              <option value="running">进行中</option>
              <option value="succeeded">成功</option>
              <option value="failed">失败</option>
            </select>
            <button className="button-secondary" onClick={() => void loadTasks(1)} type="button"><BrandIcon />查询</button>
          </div>
          <div className="overflow-x-auto">
            <table className="w-full text-left text-sm">
              <thead className="border-b border-line text-xs uppercase tracking-[0.14em] text-subtle">
                <tr>
                  <th className="px-5 py-3">用户</th>
                  <th className="px-5 py-3">状态</th>
                  <th className="px-5 py-3">计量</th>
                  <th className="px-5 py-3">耗时</th>
                  <th className="px-5 py-3">结算</th>
                  <th className="px-5 py-3">错误</th>
                  <th className="px-5 py-3"></th>
                </tr>
              </thead>
              <tbody className="divide-y divide-line">
                {loading ? (
                  <tr><td className="px-5 py-8 text-center text-muted" colSpan={7}>加载中…</td></tr>
                ) : tasks.length === 0 ? (
                  <tr><td className="px-5 py-8 text-center text-muted" colSpan={7}>无匹配任务</td></tr>
                ) : (
                  tasks.map((task) => (
                    <tr className="hover:bg-panel/40" key={task.id}>
                      <td className="px-5 py-3"><p className="text-copy">{task.user_email}</p><p className="text-xs text-subtle">{new Date(task.created_at).toLocaleString()}</p></td>
                      <td className="px-5 py-3">{statusLabel[task.status] ?? task.status}</td>
                      <td className="px-5 py-3">{task.text_length} 字符</td>
                      <td className="px-5 py-3">{task.duration_ms != null ? `${(task.duration_ms / 1000).toFixed(1)}s` : "—"}</td>
                      <td className="px-5 py-3">{settleLabel[task.settlement] ?? task.settlement}</td>
                      <td className="px-5 py-3 text-danger">{task.error_code ?? "—"}</td>
                      <td className="px-5 py-3"><span className="text-xs text-subtle">{task.id.slice(0, 8)}</span></td>
                    </tr>
                  ))
                )}
              </tbody>
            </table>
          </div>
          <div className="flex items-center justify-between gap-3 border-t border-line p-4 text-sm">
            <span className="text-subtle">第 {taskPage} / {taskPages} 页</span>
            <div className="flex gap-2">
              <button className="button-ghost disabled:opacity-50" disabled={taskPage <= 1} onClick={() => void loadTasks(Math.max(1, taskPage - 1))} type="button"><BrandIcon />上一页</button>
              <button className="button-ghost disabled:opacity-50" disabled={taskPage >= taskPages} onClick={() => void loadTasks(taskPage + 1)} type="button"><BrandIcon />下一页</button>
            </div>
          </div>
        </div>
      ) : (
        <div className="rounded-2xl border border-line bg-panel/50">
          <p className="border-b border-line p-5 text-xs leading-6 text-subtle">审计记录默认不含完整用户输入文本，也不显示任何密钥或令牌。账号禁用、会员变更、VIP 撤销和额度调整均记录操作者、前后值与原因。</p>
          <div className="overflow-x-auto">
            <table className="w-full text-left text-sm">
              <thead className="border-b border-line text-xs uppercase tracking-[0.14em] text-subtle">
                <tr>
                  <th className="px-5 py-3">操作者</th>
                  <th className="px-5 py-3">动作</th>
                  <th className="px-5 py-3">目标</th>
                  <th className="px-5 py-3">原因</th>
                  <th className="px-5 py-3">时间</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-line">
                {audits.length === 0 ? (
                  <tr><td className="px-5 py-8 text-center text-muted" colSpan={5}>暂无审计记录</td></tr>
                ) : (
                  audits.map((a) => (
                    <tr className="hover:bg-panel/40" key={a.id}>
                      <td className="px-5 py-3 text-copy">{a.actor_email ?? "—"}</td>
                      <td className="px-5 py-3">{actionLabel[a.action] ?? a.action}</td>
                      <td className="px-5 py-3"><span className="text-xs text-subtle">{a.target_type} · {String(a.target_id).slice(0, 8)}</span></td>
                      <td className="px-5 py-3 text-muted">{a.reason}</td>
                      <td className="px-5 py-3 text-subtle">{new Date(a.created_at).toLocaleString()}</td>
                    </tr>
                  ))
                )}
              </tbody>
            </table>
          </div>
          <div className="flex items-center justify-between gap-3 border-t border-line p-4 text-sm">
            <span className="text-subtle">第 {auditPage} / {auditPages} 页</span>
            <div className="flex gap-2">
              <button className="button-ghost disabled:opacity-50" disabled={auditPage <= 1} onClick={() => void loadAudit(Math.max(1, auditPage - 1))} type="button"><BrandIcon />上一页</button>
              <button className="button-ghost disabled:opacity-50" disabled={auditPage >= auditPages} onClick={() => void loadAudit(auditPage + 1)} type="button"><BrandIcon />下一页</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}