"use client";

import Link from "next/link";
import { useCallback, useMemo, useState, type ReactElement } from "react";
import { useTranslation } from "react-i18next";
import { ClipboardList, RefreshCw, Search, Users } from "lucide-react";

import { getAdminDashboard } from "@/api/admin-dashboard";
import { useAsyncEffect } from "@/hooks/use-async-effect";
import { useAdminDateTimeFormatter } from "@/hooks/use-admin-datetime-formatter";
import { useTranslationRef } from "@/hooks/use-translation-ref";
import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
import { Button, buttonVariants } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Skeleton } from "@/components/ui/skeleton";
import { AdminNoResourceState } from "@/components/admin/admin-no-resource-state";
import {
  DashboardKpiCard,
  DashboardScopeMetric,
} from "@/modules/dashboard/dashboard-visuals";
import { cn } from "@/lib/utils";
import { useAdminProfile } from "@/stores/admin-session";
import type {
  AdminDashboardSiteCsOverview,
  AdminDashboardWarning,
} from "@/types/api/admin-dashboard";
import { LotteryApiBizError } from "@/types/api/errors";

export function SiteCsDashboardConsole(): ReactElement {
  const { t } = useTranslation(["dashboard", "common"]);
  const tRef = useTranslationRef(["dashboard", "common"]);
  const formatDt = useAdminDateTimeFormatter();
  const profile = useAdminProfile();
  const site = profile?.site ?? null;

  const [loading, setLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [apiWarnings, setApiWarnings] = useState<AdminDashboardWarning[]>([]);
  const [overview, setOverview] = useState<AdminDashboardSiteCsOverview | null>(null);

  const load = useCallback(async (isRefresh = false) => {
    if (isRefresh) {
      setRefreshing(true);
    } else {
      setLoading(true);
    }
    setError(null);

    try {
      const d = await getAdminDashboard();
      setOverview(d.site_cs_overview);
      setApiWarnings(d.warnings ?? []);
    } catch (e) {
      const msg =
        e instanceof LotteryApiBizError ? e.message : tRef.current("warnings.loadFailed");
      setError(msg);
    } finally {
      setLoading(false);
      setRefreshing(false);
    }
  }, [tRef]);

  useAsyncEffect(() => {
    void load(false);
  }, []);

  const activityHint = useMemo(() => {
    if (!overview) {
      return "";
    }
    if (overview.latest_ticket_at) {
      return t("cs.latestTicketAt", { time: formatDt(overview.latest_ticket_at) });
    }
    return t("cs.noTicketToday");
  }, [formatDt, overview, t]);

  const quickLinks = useMemo(
    () => [
      { href: "/admin/players", label: t("cs.quickLinks.players"), icon: Users },
      { href: "/admin/tickets", label: t("cs.quickLinks.tickets"), icon: ClipboardList },
      { href: "/admin/wallet/transactions", label: t("cs.quickLinks.wallet"), icon: Search },
    ],
    [t],
  );

  return (
    <div className="flex min-w-0 w-full max-w-none flex-col gap-5">
      <div className="flex flex-wrap items-center justify-between gap-2">
        <div className="min-w-0">
          <h1 className="admin-list-title">{t("cs.title")}</h1>
          <p className="mt-0.5 text-xs text-muted-foreground">
            {site
              ? t("cs.subtitle", { name: site.name || site.code })
              : t("cs.subtitleFallback")}
          </p>
        </div>
        <Button
          type="button"
          variant="outline"
          size="sm"
          className="h-8"
          disabled={loading || refreshing}
          onClick={() => void load(true)}
        >
          <RefreshCw className={cn("size-3.5", refreshing && "animate-spin")} />
          {t("actions.refresh", { ns: "common" })}
        </Button>
      </div>

      {error ? (
        <Alert className="border-amber-200 bg-amber-50 dark:border-amber-900/60 dark:bg-amber-950/30">
          <AlertTitle>{t("notice")}</AlertTitle>
          <AlertDescription>{error}</AlertDescription>
        </Alert>
      ) : null}

      {!loading && apiWarnings.length > 0 ? (
        <Alert className="border-amber-200 bg-amber-50 dark:border-amber-900/60 dark:bg-amber-950/30">
          <AlertTitle>{t("notice")}</AlertTitle>
          <AlertDescription>{apiWarnings.map((w) => w.message).join(" ")}</AlertDescription>
        </Alert>
      ) : null}

      {loading ? (
        <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
          {Array.from({ length: 3 }).map((_, i) => (
            <Skeleton key={i} className="h-24 rounded-xl" />
          ))}
        </div>
      ) : overview ? (
        <section className="space-y-4">
          <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
            <DashboardKpiCard
              label={t("cs.playerCount")}
              value={overview.player_count}
              icon={<Users className="size-4" />}
              hint={t("cs.playerCountHint")}
            />
            <DashboardKpiCard
              label={t("cs.ticketsToday")}
              value={overview.ticket_order_count_today}
              icon={<ClipboardList className="size-4" />}
              hint={activityHint}
            />
            <DashboardKpiCard
              label={t("cs.activePlayersToday")}
              value={overview.active_player_count_today}
              icon={<Search className="size-4" />}
              hint={t("cs.activePlayersHint")}
            />
          </div>

          <Card>
            <CardHeader className="pb-2">
              <CardTitle className="text-sm font-semibold">{t("cs.workspaceTitle")}</CardTitle>
            </CardHeader>
            <CardContent className="grid gap-3 sm:grid-cols-3">
              {quickLinks.map((link) => {
                const Icon = link.icon;
                return (
                  <Link
                    key={link.href}
                    href={link.href}
                    className="flex flex-col gap-2 rounded-xl border bg-muted/20 px-4 py-4 transition-colors hover:bg-muted/40"
                  >
                    <Icon className="size-5 text-primary" aria-hidden />
                    <span className="text-sm font-medium">{link.label}</span>
                    <span className="text-xs text-muted-foreground">{t("cs.openModule")}</span>
                  </Link>
                );
              })}
            </CardContent>
          </Card>

          <Card>
            <CardHeader className="pb-2">
              <CardTitle className="text-sm font-semibold">{t("cs.scopeTitle")}</CardTitle>
            </CardHeader>
            <CardContent className="grid grid-cols-2 gap-3 text-sm">
              <DashboardScopeMetric label={t("cs.playerCount")} value={String(overview.player_count)} />
              <DashboardScopeMetric
                label={t("cs.ticketsToday")}
                value={String(overview.ticket_order_count_today)}
              />
            </CardContent>
          </Card>
        </section>
      ) : (
        <AdminNoResourceState className="py-12 text-sm text-muted-foreground">
          {t("cs.overviewEmpty")}
        </AdminNoResourceState>
      )}
    </div>
  );
}