"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { AlertTriangle, CheckCircle2, Database, FileQuestion, Library, Play, Rows3, Timer } from "lucide-react";
import { api, formatDateTime } from "@/lib/api";
import type { DashboardSummary, TaskRun } from "@/lib/types";
import StatCard from "@/components/StatCard";
import StatusBadge from "@/components/StatusBadge";

export default function DashboardPage() {
  const [summary, setSummary] = useState<DashboardSummary | null>(null);
  const [loading, setLoading] = useState(true);
  const [running, setRunning] = useState(false);

  async function load() {
    setLoading(true);
    const data = await api.get<DashboardSummary>("/dashboard/summary");
    setSummary(data);
    setLoading(false);
  }

  async function runTask() {
    setRunning(true);
    await api.post<TaskRun>("/tasks/run-now", {});
    await load();
    setRunning(false);
  }

  useEffect(() => {
    load().catch(() => setLoading(false));
  }, []);

  if (loading || !summary) {
    return <div className="text-sm text-slate-500">加载中...</div>;
  }

  const actions = [
    { href: "/review", label: "去审核" },
    { href: "/high-risk", label: "查看高风险" },
    { href: "/standard-qa", label: "查看标准问答库" },
    { href: "/logs", label: "查看运行日志" }
  ];

  return (
    <div className="space-y-6">
      <div className="flex flex-wrap items-center justify-between gap-3">
        <div>
          <h1 className="text-2xl font-semibold text-ink">仪表盘</h1>
          <p className="mt-1 text-sm text-slate-500">最近任务：{summary.last_task_time ? formatDateTime(summary.last_task_time) : "-"}</p>
        </div>
        <button
          onClick={runTask}
          disabled={running}
          className="inline-flex h-10 items-center gap-2 rounded-md bg-jade px-4 text-sm font-medium text-white hover:bg-teal-800 disabled:opacity-60"
        >
          <Play className="h-4 w-4" aria-hidden />
          {running ? "处理中" : "手动触发处理任务"}
        </button>
      </div>

      <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-4">
        <StatCard title="昨晚处理答疑场次数" value={summary.processed_sessions} icon={<Timer className="h-5 w-5" />} />
        <StatCard title="已拆解问答总数" value={summary.pending_review_count + summary.approved_qa_count} icon={<Rows3 className="h-5 w-5" />} tone="indigo" />
        <StatCard title="待审核问答数" value={summary.pending_review_count} icon={<FileQuestion className="h-5 w-5" />} tone="amber" />
        <StatCard title="高风险问答数" value={summary.high_risk_count} icon={<AlertTriangle className="h-5 w-5" />} tone="rose" />
        <StatCard title="已审核问答数" value={summary.approved_qa_count} icon={<CheckCircle2 className="h-5 w-5" />} />
        <StatCard title="标准问答数" value={summary.standard_qa_count} icon={<Library className="h-5 w-5" />} tone="indigo" />
        <StatCard title="可被智能体调用问答数" value={summary.callable_qa_count} icon={<Database className="h-5 w-5" />} />
        <div className="rounded-md border border-line bg-white p-4">
          <div className="text-sm text-slate-500">最近一次任务状态</div>
          <div className="mt-3">
            {summary.last_task_status ? <StatusBadge status={summary.last_task_status} /> : <span className="text-sm text-slate-400">暂无任务</span>}
          </div>
          {summary.last_task_error ? <p className="mt-3 text-sm text-rose-700">{summary.last_task_error}</p> : null}
        </div>
      </div>

      <div className="flex flex-wrap gap-2">
        {actions.map((action) => (
          <Link
            key={action.href}
            href={action.href}
            className="inline-flex h-10 items-center rounded-md border border-line bg-white px-4 text-sm font-medium text-ink hover:bg-slate-50"
          >
            {action.label}
          </Link>
        ))}
      </div>
    </div>
  );
}