"use client";

import { useEffect, useState } from "react";
import Link from "next/link";
import { Bot, ShieldAlert, KeyRound, Radar } from "lucide-react";
import { AdminStatCard } from "@/components/admin";
import { AdminChartCard, NamedBarChart, SingleAreaChart } from "@/components/admin/charts";
import { apiStatsSecurity, type VisitSecurity } from "@/lib/api";
import { RangeSegmented, StatsState, TableEmpty, formatInt } from "../ui";

export default function SecurityPage() {
  const [range, setRange] = useState<"7d" | "30d">("7d");
  const [data, setData] = useState<VisitSecurity | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");

  useEffect(() => {
    let alive = true;
    setLoading(true);
    apiStatsSecurity(range)
      .then((d) => {
        if (alive) {
          setData(d);
          setError("");
        }
      })
      .catch(() => alive && setError("加载失败，请稍后重试"))
      .finally(() => alive && setLoading(false));
    return () => {
      alive = false;
    };
  }, [range]);

  if (!data) return <StatsState loading={loading} error={error || undefined} />;

  const botTrend = data.bot_trend.map((d) => ({ date: d.date, pv: d.pv }));

  return (
    <div className="flex flex-col gap-4">
      <div className="flex items-center justify-between gap-2 flex-wrap">
        <p className="meta text-[12.5px]">爬虫与异常探测请求仅记录明细，不计入 PV/UV 统计。</p>
        <RangeSegmented value={range} onChange={setRange} />
      </div>

      {error ? <StatsState error={error} /> : null}

      <div className="grid gap-3 grid-cols-2 xl:grid-cols-4">
        <AdminStatCard label="爬虫请求" value={formatInt(data.bots.reduce((s, b) => s + b.count, 0))} icon={<Bot size={17} />} />
        <AdminStatCard
          label="异常探测"
          value={formatInt(data.probe_status.reduce((s, b) => s + b.count, 0))}
          hint="状态码 ≥400 的请求"
          icon={<Radar size={17} />}
          color="var(--gold)"
          soft="var(--gold-soft)"
        />
        <AdminStatCard
          label="登录失败"
          value={formatInt(data.login_failed)}
          sub={`${formatInt(data.failed_users)} 个账号`}
          icon={<KeyRound size={17} />}
          color="var(--ink-2)"
          soft="var(--panel-2)"
        />
        <AdminStatCard
          label="可疑 IP"
          value={formatInt(data.probe_ips.length)}
          hint="按探测次数排序"
          icon={<ShieldAlert size={17} />}
          color="var(--danger)"
          soft="var(--danger-soft, var(--panel-2))"
        />
      </div>

      <div className="grid gap-4 lg:grid-cols-2">
        <AdminChartCard title="爬虫分布" hint={`近 ${data.range_days} 日各爬虫请求量`}>
          {data.bots.length ? (
            <NamedBarChart data={data.bots.map((b) => ({ label: b.key, count: b.count }))} />
          ) : (
            <TableEmpty text="暂无爬虫记录" />
          )}
        </AdminChartCard>
        <AdminChartCard title="爬虫趋势" hint="每日爬虫请求量">
          {botTrend.length ? (
            <SingleAreaChart data={botTrend} dataKey="pv" name="爬虫请求" color="var(--gold)" />
          ) : (
            <TableEmpty />
          )}
        </AdminChartCard>
      </div>

      <div className="grid gap-4 lg:grid-cols-2">
        <AdminChartCard title="探测状态码分布" hint="状态码 ≥400 的请求">
          {data.probe_status.length ? (
            <NamedBarChart data={data.probe_status.map((s) => ({ label: s.key, count: s.count }))} />
          ) : (
            <TableEmpty text="暂无异常探测" />
          )}
        </AdminChartCard>
        <AdminChartCard title="可疑 IP Top 20" hint="点击「查明细」查看该 IP 全部访问记录">
          {data.probe_ips.length ? (
            <ul className="flex flex-col divide-y max-h-[360px] overflow-y-auto" style={{ borderColor: "var(--line)" }}>
              {data.probe_ips.map((ip) => (
                <li key={ip.key} className="py-2 flex items-center gap-3 text-[13px]">
                  <span className="flex-1 min-w-0 truncate tabular-nums" style={{ color: "var(--ink)" }}>
                    {ip.key}
                  </span>
                  <span className="tabular-nums shrink-0" style={{ color: "var(--ink-2)" }}>
                    {formatInt(ip.count)}
                  </span>
                  <Link
                    href={`/admin/analytics/details?ip=${encodeURIComponent(ip.key)}`}
                    className="btn btn-line btn-sm shrink-0"
                  >
                    查明细
                  </Link>
                </li>
              ))}
            </ul>
          ) : (
            <TableEmpty text="暂无可疑 IP" />
          )}
        </AdminChartCard>
      </div>
    </div>
  );
}