"use client";

import React, { useEffect, useState } from "react";
import dynamic from "next/dynamic";
import { DashboardElement } from "@/components/admin/dashboard/types";
import { getMultipleWeather, WeatherData } from "@/lib/api/openApi";
import { Cloud, CloudRain, CloudSnow, Sun, Wind } from "lucide-react";
import "leaflet/dist/leaflet.css";

// Leaflet 아이콘 경로 설정 (엑박 방지)
if (typeof window !== "undefined") {
  const L = require("leaflet");
  delete (L.Icon.Default.prototype as any)._getIconUrl;
  L.Icon.Default.mergeOptions({
    iconRetinaUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon-2x.png",
    iconUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon.png",
    shadowUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-shadow.png",
  });
}

// Leaflet 동적 import (SSR 방지)
const MapContainer = dynamic(() => import("react-leaflet").then((mod) => mod.MapContainer), { ssr: false });
const TileLayer = dynamic(() => import("react-leaflet").then((mod) => mod.TileLayer), { ssr: false });
const Marker = dynamic(() => import("react-leaflet").then((mod) => mod.Marker), { ssr: false });
const Popup = dynamic(() => import("react-leaflet").then((mod) => mod.Popup), { ssr: false });

// 브이월드 API 키
const VWORLD_API_KEY = "97AD30D5-FDC4-3481-99C3-158E36422033";

interface WeatherMapWidgetProps {
  element: DashboardElement;
  cities?: string[];
}

/**
 * 날씨 아이콘 반환
 */
const getWeatherIcon = (weatherMain: string) => {
  switch (weatherMain.toLowerCase()) {
    case "clear":
      return <Sun className="h-6 w-6 text-warning" />;
    case "rain":
      return <CloudRain className="h-6 w-6 text-primary" />;
    case "snow":
      return <CloudSnow className="h-6 w-6 text-primary/70" />;
    case "clouds":
      return <Cloud className="h-6 w-6 text-muted-foreground" />;
    default:
      return <Wind className="h-6 w-6 text-muted-foreground" />;
  }
};

/**
 * 날씨 지도 위젯
 * - 여러 도시의 날씨를 지도에 표시
 * - 실시간 날씨 정보 (온도, 습도, 풍속 등)
 * - Leaflet + 브이월드 지도 사용
 */
export default function WeatherMapWidget({ element, cities }: WeatherMapWidgetProps) {
  const [weatherData, setWeatherData] = useState<WeatherData[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  // 기본 도시 목록 (사용자가 지정하지 않은 경우)
  const defaultCities = [
    "서울",
    "부산",
    "인천",
    "대구",
    "광주",
    "대전",
    "울산",
    "세종",
    "제주",
  ];

  const targetCities = cities || defaultCities;

  useEffect(() => {
    loadWeatherData();

    // 자동 새로고침 (5분마다)
    const interval = setInterval(() => {
      loadWeatherData();
    }, 300000);

    return () => clearInterval(interval);
  }, []);

  const loadWeatherData = async () => {
    try {
      setLoading(true);
      setError(null);

      const data = await getMultipleWeather(targetCities);
      
      // 위도경도가 있는 데이터만 필터링
      const validData = data.filter((item) => item.lat && item.lng);
      
      setWeatherData(validData);
    } catch (err: any) {
      console.error("날씨 데이터 로드 실패:", err);
      setError(err.message || "날씨 데이터를 불러오는데 실패했습니다.");
    } finally {
      setLoading(false);
    }
  };

  if (loading && weatherData.length === 0) {
    return (
      <div className="flex h-full items-center justify-center">
        <div className="text-center">
          <div className="mb-2 h-8 w-8 animate-spin rounded-full border-4 border-primary border-t-transparent"></div>
          <p className="text-sm text-muted-foreground">날씨 정보 로딩 중...</p>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="flex h-full items-center justify-center">
        <div className="text-center text-destructive">
          <p className="text-sm">{error}</p>
        </div>
      </div>
    );
  }

  if (weatherData.length === 0) {
    return (
      <div className="flex h-full items-center justify-center">
        <p className="text-sm text-muted-foreground">날씨 데이터가 없습니다.</p>
      </div>
    );
  }

  // 지도 중심 (대한민국 중심)
  const center: [number, number] = [36.5, 127.5];

  return (
    <div className="h-full w-full">
      <MapContainer
        center={center}
        zoom={7}
        scrollWheelZoom={true}
        style={{ height: "100%", width: "100%" }}
        className="rounded-lg"
      >
        {/* 브이월드 Base Map */}
        <TileLayer
          attribution='&copy; <a href="http://www.vworld.kr">VWorld</a>'
          url={`https://api.vworld.kr/req/wmts/1.0.0/${VWORLD_API_KEY}/Base/{z}/{y}/{x}.png`}
        />

        {/* 날씨 마커 */}
        {weatherData.map((weather, index) => {
          if (!weather.lat || !weather.lng) return null;

          return (
            <Marker key={index} position={[weather.lat, weather.lng]}>
              <Popup>
                <div className="min-w-[200px] p-2">
                  {/* 도시명 */}
                  <div className="mb-2 flex items-center justify-between">
                    <h3 className="text-base font-semibold">{weather.city}</h3>
                    {getWeatherIcon(weather.weatherMain)}
                  </div>

                  {/* 날씨 설명 */}
                  <p className="mb-3 text-sm text-muted-foreground">{weather.weatherDescription}</p>

                  {/* 날씨 정보 */}
                  <div className="space-y-1.5 text-xs">
                    <div className="flex justify-between">
                      <span className="text-muted-foreground">온도</span>
                      <span className="font-medium">{weather.temperature}°C</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-muted-foreground">체감온도</span>
                      <span className="font-medium">{weather.feelsLike}°C</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-muted-foreground">습도</span>
                      <span className="font-medium">{weather.humidity}%</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-muted-foreground">풍속</span>
                      <span className="font-medium">{weather.windSpeed} m/s</span>
                    </div>
                  </div>

                  {/* 타임스탬프 */}
                  <div className="mt-3 border-t pt-2 text-[10px] text-muted-foreground">
                    {new Date(weather.timestamp).toLocaleString("ko-KR", {
                      month: "short",
                      day: "numeric",
                      hour: "2-digit",
                      minute: "2-digit",
                    })}
                  </div>
                </div>
              </Popup>
            </Marker>
          );
        })}
      </MapContainer>
    </div>
  );
}