"use client";

import { useEffect, useState, useMemo } from "react";
import { useLocale, useTranslation } from "@/i18n/navigation";
import { useTheme } from "@/app/context/ThemeContext";
import { MembersMap } from "@/app/lib/charts";
import { MAP_CITIES } from "@/app/data/map-cities";
import { apiFetch } from "@/app/lib/api-client";

export default function MembersMapPage() {
  const { t } = useTranslation("membersMap");
  const locale = useLocale();
  const { theme } = useTheme();
  const [mapCities, setMapCities] = useState(MAP_CITIES);
  const [hoveredCity, setHoveredCity] = useState<typeof MAP_CITIES[0] | null>(null);

  useEffect(() => {
    apiFetch<{ items: typeof MAP_CITIES }>("/api/stats/member-map")
      .then((data) => data.items?.length && setMapCities(data.items))
      .catch(() => setMapCities(MAP_CITIES));
  }, []);

  const totalMembers = useMemo(
    () => mapCities.reduce((sum, c) => sum + c.nomadsNow, 0),
    [mapCities]
  );

  const sortedCities = useMemo(
    () => [...mapCities].sort((a, b) => b.nomadsNow - a.nomadsNow),
    [mapCities]
  );

  return (
    <div className="min-h-screen bg-[#fafafa] dark:bg-gray-950">
      <main className="max-w-[1200px] mx-auto px-4 sm:px-6 py-8 sm:py-12">
        <header className="mb-8">
          <h1 className="text-2xl sm:text-3xl font-bold text-gray-900 dark:text-gray-100 flex items-center gap-2">
            <span className="w-1 h-8 bg-[#ff4d4f] rounded-full" />
            {t("title")}
          </h1>
          <p className="text-gray-500 dark:text-gray-400 mt-1 text-sm sm:text-base">
            {t("subtitle")}
          </p>
        </header>

        <div className="grid grid-cols-1 lg:grid-cols-3 gap-6 lg:gap-8">
          <div className="lg:col-span-2 bg-white dark:bg-gray-900 rounded-2xl shadow-sm border border-gray-100 dark:border-gray-800 overflow-hidden p-4 sm:p-6">
            <div className="rounded-xl overflow-hidden bg-gray-50 dark:bg-gray-800/50">
              <MembersMap
                data={mapCities}
                locale={locale}
                dark={theme === "dark"}
                className="min-h-[400px]"
                onCityHover={setHoveredCity}
              />
            </div>
            {hoveredCity && (
              <div className="mt-4 p-3 bg-gray-50 dark:bg-gray-800 rounded-lg">
                <p className="text-sm font-medium text-gray-900 dark:text-gray-100">
                  {locale === "zh" ? hoveredCity.name : hoveredCity.nameEn} {hoveredCity.emoji}
                </p>
                <p className="text-xs text-gray-500 dark:text-gray-400 mt-0.5">
                  {hoveredCity.nomadsNow} {t("nomadsInCity")}
                </p>
              </div>
            )}
          </div>

          <div className="space-y-6">
            <div className="bg-white dark:bg-gray-900 rounded-2xl shadow-sm border border-gray-100 dark:border-gray-800 p-6">
              <h3 className="text-sm font-bold text-gray-400 dark:text-gray-500 uppercase tracking-wider mb-2">
                {t("totalMembers")}
              </h3>
              <p className="text-3xl font-bold text-gray-900 dark:text-gray-100">
                {totalMembers.toLocaleString()}+
              </p>
            </div>

            <div className="bg-white dark:bg-gray-900 rounded-2xl shadow-sm border border-gray-100 dark:border-gray-800 p-6">
              <h3 className="text-sm font-bold text-gray-400 dark:text-gray-500 uppercase tracking-wider mb-4">
                {t("cities")}
              </h3>
              <ul className="space-y-2 max-h-[280px] overflow-y-auto">
                {sortedCities.map((city) => (
                  <li
                    key={city.id}
                    className={`flex items-center justify-between py-2 px-3 rounded-lg cursor-pointer transition-colors ${
                      hoveredCity?.id === city.id
                        ? "bg-[#ff4d4f]/10 text-[#ff4d4f]"
                        : "hover:bg-gray-50 dark:hover:bg-gray-800"
                    }`}
                    onMouseEnter={() => setHoveredCity(city)}
                    onMouseLeave={() => setHoveredCity(null)}
                  >
                    <span className="flex items-center gap-2">
                      <span>{city.emoji}</span>
                      <span className="font-medium text-gray-900 dark:text-gray-100">
                        {locale === "zh" ? city.name : city.nameEn}
                      </span>
                    </span>
                    <span className="text-sm text-gray-500 dark:text-gray-400">
                      {city.nomadsNow}
                    </span>
                  </li>
                ))}
              </ul>
            </div>
          </div>
        </div>

        <p className="text-xs text-gray-400 dark:text-gray-500 mt-6 text-center">
          数据来自本地 PocketBase 城市集合，按城市成员数匿名聚合。
        </p>
      </main>
    </div>
  );
}