"use client";

import { useEffect, useState } from "react";
import { Eye, Users, LogIn, CalendarDays } from "lucide-react";
import { AdminStatCard } from "@/components/admin";
import { AdminChartCard, NamedBarChart, NamedPieChart, VisitTrendChart } from "@/components/admin/charts";
import { apiStatsOverview, type VisitOverview, type VisitPageRow } from "@/lib/api";
import { formatInt, RangeSegmented, StatsState, TableEmpty, deviceLabel, refKindLabel } from "./ui";

export default function OverviewClient({ initial }: { initial: VisitOverview | null }) {
  const [range, setRange] = useState<"7d" | "30d">("7d");
  const [data, setData] = useState<VisitOverview | null>(initial);
  const [loading, setLoading] = useState(!initial);
  const [error, setError] = useState("");

  useEffect(() => {
    let alive = true;
    setLoading(true);
    apiStatsOverview(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]);

  const delta = (today: number, yesterday: number) => {
    if (yesterday <= 0) return today > 0 ? "+100%" : "—";
    const pct = Math.round(((today - yesterday) / yesterday) * 100);
    return `${pct >= 0 ? "+" : ""}${pct}%`;
  };

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

  const devices = data.devices.map((d) => ({ label: deviceLabel(d.key), count: d.count }));
  const sources = data.sources.map((d) => ({ label: refKindLabel(d.key), count: d.count }));

  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]">
          今日 PV {formatInt(data.today_pv)} · UV {formatInt(data.today_uv)}
        </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="今日 PV"
          value={formatInt(data.today_pv)}
          sub={`${delta(data.today_pv, data.yesterday_pv)} vs 昨日`}
          icon={<Eye size={17} />}
        />
        <AdminStatCard
          label="今日 UV"
          value={formatInt(data.today_uv)}
          sub={`${delta(data.today_uv, data.yesterday_uv)} vs 昨日`}
          icon={<Users size={17} />}
          color="var(--ok)"
          soft="var(--ok-soft, var(--panel-2))"
        />
        <AdminStatCard
          label="今日登录浏览"
          value={formatInt(data.logged_in_pv)}
          hint={
            data.today_pv > 0
              ? `占今日 PV ${Math.round((data.logged_in_pv / data.today_pv) * 100)}%`
              : undefined
          }
          icon={<LogIn size={17} />}
          color="var(--gold)"
          soft="var(--gold-soft)"
        />
        <AdminStatCard
          label="昨日 PV"
          value={formatInt(data.yesterday_pv)}
          hint={`昨日 UV ${formatInt(data.yesterday_uv)}`}
          icon={<CalendarDays size={17} />}
          color="var(--ink-2)"
          soft="var(--panel-2)"
        />
      </div>

      <AdminChartCard title="PV / UV 趋势" hint="来自日聚合表，历史数据不随明细清理丢失">
        <VisitTrendChart data={data.trend} />
      </AdminChartCard>

      <div className="grid gap-4 lg:grid-cols-2">
        <AdminChartCard title="设备分布" hint={`近 ${data.range_days} 日浏览`}>
          {devices.length ? <NamedPieChart data={devices} /> : <TableEmpty />}
        </AdminChartCard>
        <AdminChartCard title="来源占比" hint={`近 ${data.range_days} 日浏览`}>
          {sources.length ? <NamedBarChart data={sources} /> : <TableEmpty />}
        </AdminChartCard>
      </div>

      <AdminChartCard title="热门页面 Top 10" hint={`近 ${data.range_days} 日`}>
        {data.top_pages.length ? (
          <div className="flex flex-col divide-y" style={{ borderColor: "var(--line)" }}>
            {data.top_pages.map((p: VisitPageRow, i) => (
              <div key={p.path} className="py-2 flex items-center gap-3 text-[13px]">
                <span className="w-5 text-right tabular-nums shrink-0" style={{ color: "var(--ink-3)" }}>
                  {i + 1}
                </span>
                <span className="flex-1 min-w-0 truncate" style={{ color: "var(--ink)" }} title={p.path}>
                  {p.path || "/"}
                </span>
                <span className="hidden sm:block w-32 h-1.5 rounded-full overflow-hidden shrink-0" style={{ background: "var(--panel-2)" }}>
                  <span
                    className="block h-full rounded-full"
                    style={{ width: `${Math.min(100, p.share).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-14 text-right tabular-nums" style={{ color: "var(--ink-3)" }}>
                  UV {formatInt(p.uv)}
                </span>
              </div>
            ))}
          </div>
        ) : (
          <TableEmpty text="暂无浏览数据" />
        )}
      </AdminChartCard>
    </div>
  );
}