import { useEffect, useState } from "react";
import { listAudit, type AuditEntry } from "../api";

// 操作方法配色
const ACTION_STYLE: Record<string, string> = {
  POST: "bg-emerald-50 text-emerald-600 border border-emerald-100",
  PUT: "bg-amber-50 text-amber-600 border border-amber-100",
  DELETE: "bg-rose-50 text-rose-600 border border-rose-100",
  PATCH: "bg-violet-50 text-violet-600 border border-violet-100",
  GET: "bg-gray-50 text-gray-600 border border-gray-100",
};

const statusTone = (s: number) => (s < 300 ? "text-emerald-600" : s < 500 ? "text-amber-600" : "text-rose-500");
const shortId = (id: string) => (id && id.length > 10 ? `${id.slice(0, 4)}…${id.slice(-4)}` : id || "系统");
const fmt = (at: string) => new Date(at).toLocaleString("zh-CN", { hour12: false });

const LIMIT = 20;

const ROUTE_OPTS = [
  { value: "", label: "所有路由" },
  { value: "/api/v1/admin", label: "管理员接口 (/admin)" },
  { value: "/api/v1/prompts", label: "提示词接口 (/prompts)" },
  { value: "/api/v1/auth", label: "鉴权接口 (/auth)" },
  { value: "/api/v1/spaces", label: "空间接口 (/spaces)" },
];

export function AuditPage() {
  const [audit, setAudit] = useState<AuditEntry[]>([]);
  const [loading, setLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);
  const [updatedAt, setUpdatedAt] = useState<Date | null>(null);
  const [err, setErr] = useState("");

  // 筛选器状态
  const [methodFilter, setMethodFilter] = useState<string>(""); // 空 = 全部
  const [routeFilter, setRouteFilter] = useState<string>("");
  const [searchQuery, setSearchQuery] = useState("");

  // 分页状态
  const [page, setPage] = useState(1);
  const [hasMore, setHasMore] = useState(true);

  const load = async (pageNum = page, showRef = false) => {
    if (showRef) setRefreshing(true);
    else setLoading(true);

    try {
      const offset = (pageNum - 1) * LIMIT;
      // 从后端载入比 LIMIT 稍微多一条，以此判断是否有下一页
      const data = await listAudit(LIMIT + 1, offset);
      if (data.length > LIMIT) {
        setAudit(data.slice(0, LIMIT));
        setHasMore(true);
      } else {
        setAudit(data);
        setHasMore(false);
      }
      setUpdatedAt(new Date());
      setErr("");
    } catch (er) {
      setErr((er as Error).message);
    } finally {
      setLoading(false);
      setRefreshing(false);
    }
  };

  useEffect(() => {
    void load(page);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [page]);

  // 前端过滤（配合后端分页后的过滤，或按需做简单的前端实时匹配）
  const filteredAudit = audit.filter((a) => {
    if (methodFilter && a.action !== methodFilter) return false;
    if (routeFilter && !a.path.startsWith(routeFilter)) return false;
    if (searchQuery) {
      const q = searchQuery.toLowerCase();
      const matchActor = a.actor.toLowerCase().includes(q);
      const matchIp = a.ip.toLowerCase().includes(q);
      const matchDetail = a.detail?.toLowerCase().includes(q) ?? false;
      const matchPath = a.path.toLowerCase().includes(q);
      if (!matchActor && !matchIp && !matchDetail && !matchPath) return false;
    }
    return true;
  });

  const handlePrevPage = () => {
    if (page > 1) setPage(page - 1);
  };

  const handleNextPage = () => {
    if (hasMore) setPage(page + 1);
  };

  return (
    <div className="space-y-5">
      {/* 顶栏 */}
      <div className="flex flex-wrap items-center justify-between gap-4 rounded-2xl border border-gray-150 bg-white p-5 shadow-sm">
        <div>
          <h3 className="text-sm font-semibold tracking-tight text-gray-900">敏感操作审计</h3>
          <p className="text-xs text-gray-400">敏感操作全链路留痕 · 只增不改，供合规审计与故障溯源</p>
        </div>
        <div className="flex items-center gap-3 text-xs text-gray-400">
          {updatedAt && <span>最近更新：{updatedAt.toLocaleTimeString("zh-CN", { hour12: false })}</span>}
          <button
            onClick={() => void load(page, true)}
            disabled={refreshing}
            className="flex items-center gap-1.5 rounded-lg border border-gray-200 bg-white px-3 py-1.5 text-gray-500 hover:bg-gray-50 disabled:opacity-40 shadow-sm"
          >
            <svg viewBox="0 0 24 24" className={`h-3.5 w-3.5 ${refreshing ? "animate-spin" : ""}`} fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
              <path d="M23 4v6h-6 M1 20v-6h6 M3.51 9a9 9 0 0 1 14.85-3.36L23 10 M1 14l4.64 4.36A9 9 0 0 0 20.49 15" />
            </svg>
            刷新
          </button>
        </div>
      </div>

      {/* 筛选工具栏 */}
      <div className="rounded-xl border border-gray-100 bg-white p-4 shadow-sm space-y-3">
        <div className="flex flex-wrap items-center justify-between gap-3">
          {/* HTTP Method Button Group */}
          <div className="flex items-center gap-1.5 rounded-lg border border-gray-150 bg-gray-50 p-1 text-xs">
            {["", "GET", "POST", "PUT", "DELETE"].map((m) => (
              <button
                key={m}
                onClick={() => { setMethodFilter(m); setPage(1); }}
                className={`rounded px-3 py-1 font-semibold transition-all ${
                  methodFilter === m
                    ? "bg-violet-600 text-white shadow-sm"
                    : "text-gray-500 hover:text-gray-700"
                }`}
              >
                {m || "全部"}
              </button>
            ))}
          </div>

          <div className="flex flex-wrap items-center gap-3">
            {/* Route prefix select */}
            <select
              value={routeFilter}
              onChange={(e) => { setRouteFilter(e.target.value); setPage(1); }}
              className="rounded-lg border border-gray-200 bg-white px-3 py-1.5 text-xs text-gray-700 focus:outline-none focus:border-violet-400 shadow-sm"
            >
              {ROUTE_OPTS.map((o) => (
                <option key={o.value} value={o.value}>{o.label}</option>
              ))}
            </select>

            {/* Search Input */}
            <input
              type="text"
              placeholder="搜索操作者 ID / IP / 详情…"
              value={searchQuery}
              onChange={(e) => { setSearchQuery(e.target.value); setPage(1); }}
              className="rounded-lg border border-gray-200 px-3 py-1.5 text-xs focus:outline-none focus:border-violet-400 w-56 shadow-sm"
            />
          </div>
        </div>
      </div>

      {/* 审计日志列表 */}
      <section className="rounded-2xl border border-gray-200/70 bg-white p-5 shadow-sm">
        <div className="mb-4 flex items-baseline justify-between border-b pb-3">
          <div className="flex items-baseline gap-2">
            <h3 className="text-sm font-semibold tracking-tight text-gray-900">操作日志明细</h3>
            <span className="text-xs text-gray-400">当前页展示 {filteredAudit.length} 条</span>
          </div>
        </div>

        {loading ? (
          <div className="py-12 text-center text-xs text-gray-400 animate-pulse">正在载入审计记录…</div>
        ) : err ? (
          <div className="py-12 text-center text-xs text-rose-500">加载失败：{err}</div>
        ) : filteredAudit.length === 0 ? (
          <div className="py-12 text-center text-xs text-gray-400">没有匹配的审计记录</div>
        ) : (
          <div className="space-y-1.5">
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="border-b text-left text-[11px] uppercase tracking-wide text-gray-400">
                    <th className="py-2 pr-3 font-medium w-16">方法</th>
                    <th className="py-2 pr-3 font-medium">路由路径</th>
                    <th className="py-2 pr-3 font-medium w-16">状态</th>
                    <th className="py-2 pr-3 font-medium">详情</th>
                    <th className="py-2 pr-3 font-medium w-24">操作人</th>
                    <th className="py-2 pr-3 font-medium w-28">客户端 IP</th>
                    <th className="py-2 font-medium w-36">触发时间</th>
                  </tr>
                </thead>
                <tbody>
                  {filteredAudit.map((a) => (
                    <tr key={a.id} className="border-b border-gray-50 last:border-0 hover:bg-gray-50/40 text-xs">
                      <td className="py-2.5 pr-3">
                        <span className={`inline-block w-14 rounded px-1.5 py-0.5 text-center text-[10px] font-bold ${ACTION_STYLE[a.action] ?? "bg-gray-100 text-gray-500"}`}>
                          {a.action}
                        </span>
                      </td>
                      <td className="py-2.5 pr-3 max-w-[12rem] truncate font-mono text-[11px] text-gray-600" title={a.path}>
                        {a.path}
                      </td>
                      <td className={`py-2.5 pr-3 font-mono font-semibold ${statusTone(a.status)}`}>
                        {a.status}
                      </td>
                      <td className="py-2.5 pr-3 text-gray-500 text-[11px] max-w-[20rem] truncate" title={a.detail}>
                        {a.detail || "—"}
                      </td>
                      <td className="py-2.5 pr-3 font-mono text-gray-400" title={a.actor}>
                        {shortId(a.actor)}
                      </td>
                      <td className="py-2.5 pr-3 text-gray-400 font-mono">
                        {a.ip}
                      </td>
                      <td className="py-2.5 text-gray-400">
                        {fmt(a.at)}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>

            {/* Pagination controls */}
            <div className="flex items-center justify-between border-t border-gray-100 pt-4 mt-2">
              <span className="text-xs text-gray-400">
                当前第 <span className="font-semibold text-gray-700">{page}</span> 页
              </span>
              <div className="flex gap-2">
                <button
                  onClick={handlePrevPage}
                  disabled={page === 1}
                  className="rounded-lg border border-gray-200 bg-white px-3 py-1.5 text-xs text-gray-600 hover:bg-gray-50 disabled:opacity-40 shadow-sm"
                >
                  上一页
                </button>
                <button
                  onClick={handleNextPage}
                  disabled={!hasMore}
                  className="rounded-lg border border-gray-200 bg-white px-3 py-1.5 text-xs text-gray-600 hover:bg-gray-50 disabled:opacity-40 shadow-sm"
                >
                  下一页
                </button>
              </div>
            </div>
          </div>
        )}
      </section>
    </div>
  );
}