"use client";

import { Suspense, useCallback, useEffect, useState } from "react";
import { useSearchParams } from "next/navigation";
import { AdminPager, AdminSegmented } from "@/components/admin";
import { AdminChartCard } from "@/components/admin/charts";
import AdminSearchField from "@/components/admin/AdminSearchField";
import { apiStatsEvents, type VisitEventItem, type VisitEventsResult } from "@/lib/api";
import { StatsState, TableEmpty, deviceLabel, kindLabel, refKindLabel } from "../ui";

const PAGE_SIZE = 50;

const KIND_OPTIONS = [
  { key: "", label: "全部" },
  { key: "pageview", label: "浏览" },
  { key: "bot", label: "爬虫" },
  { key: "probe", label: "探测" },
];

/** 本地日期（yyyy-mm-dd）→ RFC3339，覆盖全天 */
function dayToRFC3339(date: string, endOfDay = false): string {
  if (!date) return "";
  return new Date(`${date}T${endOfDay ? "23:59:59" : "00:00:00"}`).toISOString();
}

function kindBadge(kind: string) {
  const map: Record<string, { color: string; soft: string }> = {
    pageview: { color: "var(--accent)", soft: "var(--accent-soft)" },
    bot: { color: "var(--gold)", soft: "var(--gold-soft)" },
    probe: { color: "var(--danger)", soft: "var(--danger-soft, var(--panel-2))" },
  };
  const s = map[kind] ?? { color: "var(--ink-3)", soft: "var(--panel-2)" };
  return (
    <span
      className="inline-block px-2 py-0.5 rounded-full text-[11px] font-medium shrink-0"
      style={{ color: s.color, background: s.soft }}
    >
      {kindLabel(kind)}
    </span>
  );
}

function DetailsInner() {
  const searchParams = useSearchParams();
  // 初始筛选只读一次（如从「爬虫与安全」跳转 ?ip=x.x.x.x）
  const [initialIp] = useState(() => searchParams.get("ip") ?? "");

  const [kind, setKind] = useState("");
  const [path, setPath] = useState("");
  const [ip, setIp] = useState(initialIp);
  const [bot, setBot] = useState("");
  const [start, setStart] = useState("");
  const [end, setEnd] = useState("");
  const [page, setPage] = useState(1);
  const [data, setData] = useState<VisitEventsResult | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");

  const load = useCallback(
    (f: { kind: string; path: string; ip: string; bot: string; start: string; end: string }, p: number) => {
      setLoading(true);
      apiStatsEvents({
        kind: f.kind || undefined,
        path: f.path || undefined,
        ip: f.ip || undefined,
        bot: f.bot || undefined,
        start: dayToRFC3339(f.start) || undefined,
        end: dayToRFC3339(f.end, true) || undefined,
        page: p,
        size: PAGE_SIZE,
      })
        .then((d) => {
          setData(d);
          setError("");
        })
        .catch(() => setError("加载失败，请稍后重试"))
        .finally(() => setLoading(false));
    },
    []
  );

  useEffect(() => {
    load({ kind, path, ip, bot, start, end }, page);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [load, kind, path, ip, bot, start, end, page]);

  const resetPage = () => setPage(1);

  return (
    <div className="flex flex-col gap-4">
      <p className="meta text-[12.5px]">
        记录含浏览、爬虫与异常请求；访客标识仅存哈希，IP 与登录日志口径一致，仅超管可见。
      </p>

      <AdminChartCard title="访问明细" hint={`共 ${data ? data.total.toLocaleString("zh-CN") : "…"} 条记录`}>
        <div className="flex flex-col gap-2.5 mb-4">
          <AdminSegmented options={KIND_OPTIONS} value={kind} onChange={(k) => { setKind(k); resetPage(); }} ariaLabel="事件类型筛选" role="group" size="sm" />
          <div className="flex items-center gap-2 flex-wrap">
            <div className="w-full sm:w-56">
              <AdminSearchField
                value={path}
                onChange={(v) => { setPath(v); }}
                onSubmit={resetPage}
                onClear={() => { setPath(""); resetPage(); }}
                placeholder="路径模糊匹配，回车应用"
                ariaLabel="按路径筛选"
              />
            </div>
            <div className="w-full sm:w-44">
              <AdminSearchField
                value={ip}
                onChange={setIp}
                onSubmit={resetPage}
                onClear={() => { setIp(""); resetPage(); }}
                placeholder="按 IP 筛选，回车应用"
                ariaLabel="按 IP 筛选"
              />
            </div>
            <div className="w-full sm:w-40">
              <AdminSearchField
                value={bot}
                onChange={setBot}
                onSubmit={resetPage}
                onClear={() => { setBot(""); resetPage(); }}
                placeholder="按爬虫名筛选"
                ariaLabel="按爬虫名筛选"
              />
            </div>
            <label className="flex items-center gap-1.5 text-[12px]" style={{ color: "var(--ink-3)" }}>
              从
              <input
                type="date"
                value={start}
                onChange={(e) => { setStart(e.target.value); resetPage(); }}
                className="admin-field-input"
                style={{ width: 150 }}
                aria-label="开始日期"
              />
            </label>
            <label className="flex items-center gap-1.5 text-[12px]" style={{ color: "var(--ink-3)" }}>
              至
              <input
                type="date"
                value={end}
                onChange={(e) => { setEnd(e.target.value); resetPage(); }}
                className="admin-field-input"
                style={{ width: 150 }}
                aria-label="结束日期"
              />
            </label>
          </div>
        </div>

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

        {data && data.items.length ? (
          <>
            <div className="overflow-x-auto">
              <table className="w-full text-[12.5px]" style={{ minWidth: 860 }}>
                <thead>
                  <tr className="text-left" style={{ color: "var(--ink-3)" }}>
                    <th className="py-2 pr-3 font-medium whitespace-nowrap">时间</th>
                    <th className="py-2 pr-3 font-medium">类型</th>
                    <th className="py-2 pr-3 font-medium">路径</th>
                    <th className="py-2 pr-3 font-medium">来源</th>
                    <th className="py-2 pr-3 font-medium whitespace-nowrap">设备 / 系统 / 浏览器</th>
                    <th className="py-2 pr-3 font-medium">用户</th>
                    <th className="py-2 pr-3 font-medium">IP</th>
                    <th className="py-2 font-medium text-right">状态</th>
                  </tr>
                </thead>
                <tbody>
                  {data.items.map((e: VisitEventItem) => (
                    <tr key={e.id} style={{ borderTop: "1px solid var(--line)" }}>
                      <td className="py-2 pr-3 whitespace-nowrap tabular-nums" style={{ color: "var(--ink-3)" }}>
                        {new Date(e.created_at).toLocaleString("zh-CN", { month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit", second: "2-digit" })}
                      </td>
                      <td className="py-2 pr-3">
                        {kindBadge(e.kind)}
                        {e.bot ? (
                          <span className="ml-1 text-[11px]" style={{ color: "var(--ink-3)" }}>
                            {e.bot}
                          </span>
                        ) : null}
                      </td>
                      <td className="py-2 pr-3 max-w-[220px] truncate" style={{ color: "var(--ink)" }} title={e.path}>
                        {e.path || "/"}
                      </td>
                      <td className="py-2 pr-3 whitespace-nowrap" style={{ color: "var(--ink-3)" }} title={e.ref_host}>
                        {e.ref_host ? (
                          <>
                            {e.ref_host}
                            <span className="ml-1 text-[11px]">{refKindLabel(e.ref_kind)}</span>
                          </>
                        ) : (
                          refKindLabel(e.ref_kind)
                        )}
                      </td>
                      <td className="py-2 pr-3 whitespace-nowrap" style={{ color: "var(--ink-2)" }}>
                        {deviceLabel(e.device)} · {e.os || "?"} · {e.browser || "?"}
                      </td>
                      <td className="py-2 pr-3 whitespace-nowrap" style={{ color: "var(--ink-2)" }}>
                        {e.username || <span style={{ color: "var(--ink-3)" }}>游客</span>}
                      </td>
                      <td className="py-2 pr-3 tabular-nums" style={{ color: "var(--ink-2)" }}>
                        {e.ip || "—"}
                      </td>
                      <td className="py-2 text-right tabular-nums" style={{ color: e.status >= 400 ? "var(--danger)" : "var(--ink-3)" }}>
                        {e.status > 0 ? e.status : "—"}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
            <AdminPager page={page} total={data.total} pageSize={PAGE_SIZE} onChange={setPage} loading={loading} />
          </>
        ) : (
          <TableEmpty text={loading ? "正在加载…" : "没有匹配的记录"} />
        )}
      </AdminChartCard>
    </div>
  );
}

export default function DetailsPage() {
  return (
    <Suspense fallback={<StatsState loading />}>
      <DetailsInner />
    </Suspense>
  );
}