"use client";

import { useCallback, useEffect, useState } from "react";
import { AdminPager } from "@/components/admin";
import { AdminChartCard } from "@/components/admin/charts";
import AdminSearchField from "@/components/admin/AdminSearchField";
import { apiStatsPages, type VisitPages } from "@/lib/api";
import { RangeSegmented, StatsState, TableEmpty, formatInt } from "../ui";

const PAGE_SIZE = 20;

export default function PagesPage() {
  const [range, setRange] = useState<"7d" | "30d">("7d");
  const [q, setQ] = useState("");
  const [applied, setApplied] = useState("");
  const [page, setPage] = useState(1);
  const [data, setData] = useState<VisitPages | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");

  const load = useCallback(
    (r: "7d" | "30d", query: string, p: number) => {
      setLoading(true);
      apiStatsPages(r, query, p, PAGE_SIZE)
        .then((d) => {
          setData(d);
          setError("");
        })
        .catch(() => setError("加载失败，请稍后重试"))
        .finally(() => setLoading(false));
    },
    []
  );

  useEffect(() => {
    load(range, applied, page);
  }, [load, range, applied, page]);

  const switchRange = (r: "7d" | "30d") => {
    setRange(r);
    setPage(1);
  };

  const submitSearch = () => {
    setApplied(q.trim());
    setPage(1);
  };

  const clearSearch = () => {
    setQ("");
    setApplied("");
    setPage(1);
  };

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

  const maxPv = data.items[0]?.pv ?? 1;

  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]">
          共 {formatInt(data.total)} 个不同路径被访问（近 {data.range_days} 日）
        </p>
        <RangeSegmented value={range} onChange={switchRange} />
      </div>

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

      <AdminChartCard
        title="受访页面"
        hint="按 PV 降序；搜索支持路径模糊匹配"
        actions={
          <div className="w-full sm:w-64">
            <AdminSearchField
              value={q}
              onChange={setQ}
              onSubmit={submitSearch}
              onClear={clearSearch}
              placeholder="搜索路径…"
              ariaLabel="搜索受访路径"
            />
          </div>
        }
      >
        {data.items.length ? (
          <>
            <div className="flex flex-col divide-y" style={{ borderColor: "var(--line)" }}>
              {data.items.map((p) => (
                <div key={p.path} className="py-2.5 flex items-center gap-3 text-[13px]">
                  <span className="flex-1 min-w-0 truncate font-medium" style={{ color: "var(--ink)" }} title={p.path}>
                    {p.path || "/"}
                  </span>
                  <span className="hidden sm:block w-36 h-1.5 rounded-full overflow-hidden shrink-0" style={{ background: "var(--panel-2)" }}>
                    <span
                      className="block h-full rounded-full"
                      style={{ width: `${Math.max(2, (p.pv / maxPv) * 100).toFixed(1)}%`, background: "var(--accent)" }}
                    />
                  </span>
                  <span className="w-16 text-right tabular-nums" style={{ color: "var(--ink-2)" }}>
                    {formatInt(p.pv)}
                  </span>
                  <span className="w-16 text-right tabular-nums" style={{ color: "var(--ink-3)" }}>
                    UV {formatInt(p.uv)}
                  </span>
                  <span className="w-12 text-right tabular-nums text-[11.5px]" style={{ color: "var(--ink-3)" }}>
                    {p.share.toFixed(1)}%
                  </span>
                </div>
              ))}
            </div>
            <AdminPager page={page} total={data.total} pageSize={PAGE_SIZE} onChange={setPage} loading={loading} />
          </>
        ) : (
          <TableEmpty text={applied ? "没有匹配的页面" : "暂无浏览数据"} />
        )}
      </AdminChartCard>
    </div>
  );
}