"use client";

import React, { useState, useEffect } from "react";
import dynamic from "next/dynamic";
import { Button } from "@/components/ui/button";
import { RefreshCw, Truck, Navigation } 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 }
);
const Circle = dynamic(
  () => import("react-leaflet").then((mod) => mod.Circle),
  { ssr: false }
);

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

interface Vehicle {
  id: string;
  name: string;
  driver: string;
  lat: number;
  lng: number;
  status: "running" | "idle" | "maintenance" | "breakdown";
  speed: number;
  destination: string;
  distance: number;
  fuel: number;
  avgSpeed: number;
  temperature?: number;
  isRefrigerated: boolean;
}

interface VehicleMapWidgetProps {
  refreshInterval?: number;
}

export default function VehicleMapWidget({ refreshInterval = 30000 }: VehicleMapWidgetProps) {
  const [vehicles, setVehicles] = useState<Vehicle[]>([]);
  const [selectedVehicle, setSelectedVehicle] = useState<Vehicle | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [lastUpdate, setLastUpdate] = useState<Date>(new Date());

  const loadVehicles = async () => {
    setIsLoading(true);
    
    const dummyVehicles: Vehicle[] = [
      {
        id: "V001",
        name: "냉동차 1호",
        driver: "김기사",
        lat: 35.1796 + (Math.random() - 0.5) * 0.05, // 부산
        lng: 129.0756 + (Math.random() - 0.5) * 0.05,
        status: "running",
        speed: 55 + Math.floor(Math.random() * 20),
        destination: "부산 → 울산",
        distance: 45 + Math.floor(Math.random() * 20),
        fuel: 85 + Math.floor(Math.random() * 15),
        avgSpeed: 62,
        temperature: -18 + Math.floor(Math.random() * 3),
        isRefrigerated: true,
      },
      {
        id: "V002",
        name: "일반 화물차 2호",
        driver: "이기사",
        lat: 37.4563, // 인천
        lng: 126.7052,
        status: "idle",
        speed: 0,
        destination: "대기 중",
        distance: 0,
        fuel: 5,
        avgSpeed: 0,
        isRefrigerated: false,
      },
      {
        id: "V003",
        name: "냉장차 3호",
        driver: "박기사",
        lat: 36.3504 + (Math.random() - 0.5) * 0.05, // 대전
        lng: 127.3845 + (Math.random() - 0.5) * 0.05,
        status: "running",
        speed: 40 + Math.floor(Math.random() * 15),
        destination: "대전 → 세종",
        distance: 22 + Math.floor(Math.random() * 10),
        fuel: 42 + Math.floor(Math.random() * 10),
        avgSpeed: 58,
        temperature: 2 + Math.floor(Math.random() * 4),
        isRefrigerated: true,
      },
      {
        id: "V004",
        name: "일반 화물차 4호",
        driver: "최기사",
        lat: 35.8714, // 대구
        lng: 128.6014,
        status: "maintenance",
        speed: 0,
        destination: "정비소",
        distance: 0,
        fuel: 0,
        avgSpeed: 0,
        isRefrigerated: false,
      },
      {
        id: "V005",
        name: "냉동차 5호",
        driver: "정기사",
        lat: 33.4996 + (Math.random() - 0.5) * 0.05, // 제주
        lng: 126.5312 + (Math.random() - 0.5) * 0.05,
        status: "running",
        speed: 45 + Math.floor(Math.random() * 15),
        destination: "제주 → 서귀포",
        distance: 28 + Math.floor(Math.random() * 10),
        fuel: 52 + Math.floor(Math.random() * 10),
        avgSpeed: 54,
        temperature: -20 + Math.floor(Math.random() * 2),
        isRefrigerated: true,
      },
      {
        id: "V006",
        name: "일반 화물차 6호",
        driver: "강기사",
        lat: 35.1595, // 광주
        lng: 126.8526,
        status: "breakdown",
        speed: 0,
        destination: "고장 (견인 대기)",
        distance: 65,
        fuel: 18,
        avgSpeed: 0,
        isRefrigerated: false,
      },
      {
        id: "V007",
        name: "냉장차 7호",
        driver: "윤기사",
        lat: 37.5665 + (Math.random() - 0.5) * 0.05, // 서울
        lng: 126.9780 + (Math.random() - 0.5) * 0.05,
        status: "running",
        speed: 60 + Math.floor(Math.random() * 15),
        destination: "서울 → 수원",
        distance: 35 + Math.floor(Math.random() * 10),
        fuel: 68 + Math.floor(Math.random() * 10),
        avgSpeed: 65,
        temperature: 3 + Math.floor(Math.random() * 3),
        isRefrigerated: true,
      },
      {
        id: "V008",
        name: "일반 화물차 8호",
        driver: "한기사",
        lat: 37.8813 + (Math.random() - 0.5) * 0.05, // 춘천
        lng: 127.7300 + (Math.random() - 0.5) * 0.05,
        status: "running",
        speed: 50 + Math.floor(Math.random() * 15),
        destination: "춘천 → 강릉",
        distance: 95 + Math.floor(Math.random() * 20),
        fuel: 75 + Math.floor(Math.random() * 15),
        avgSpeed: 58,
        isRefrigerated: false,
      },
    ];

    setTimeout(() => {
      setVehicles(dummyVehicles);
      setLastUpdate(new Date());
      setIsLoading(false);
    }, 500);
  };

  useEffect(() => {
    loadVehicles();
    const interval = setInterval(loadVehicles, refreshInterval);
    return () => clearInterval(interval);
  }, [refreshInterval]);

  const getStatusColor = (status: Vehicle["status"]) => {
    switch (status) {
      case "running":
        return "#22c55e";
      case "idle":
        return "#eab308";
      case "maintenance":
        return "#f97316";
      case "breakdown":
        return "#ef4444";
      default:
        return "#6b7280";
    }
  };

  const getStatusText = (status: Vehicle["status"]) => {
    switch (status) {
      case "running":
        return "운행 중";
      case "idle":
        return "대기";
      case "maintenance":
        return "정비";
      case "breakdown":
        return "고장";
      default:
        return "알 수 없음";
    }
  };

  const statusStats = {
    running: vehicles.filter((v) => v.status === "running").length,
    idle: vehicles.filter((v) => v.status === "idle").length,
    maintenance: vehicles.filter((v) => v.status === "maintenance").length,
    breakdown: vehicles.filter((v) => v.status === "breakdown").length,
  };

  return (
    <div className="h-full w-full bg-gradient-to-br from-slate-50 to-blue-50 p-4">
      {/* 헤더 */}
      <div className="mb-3 flex items-center justify-between">
        <div>
          <h3 className="text-lg font-bold text-gray-900">🚚 실시간 차량 위치</h3>
          <p className="text-xs text-gray-500">
            마지막 업데이트: {lastUpdate.toLocaleTimeString("ko-KR")}
          </p>
        </div>
        <Button
          variant="outline"
          size="sm"
          onClick={loadVehicles}
          disabled={isLoading}
          className="h-8 w-8 p-0"
        >
          <RefreshCw className={`h-4 w-4 ${isLoading ? "animate-spin" : ""}`} />
        </Button>
      </div>

      {/* 차량 상태 요약 */}
      <div className="mb-3 grid grid-cols-2 md:grid-cols-4 gap-2">
        <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-green-500">
          <div className="text-xs text-gray-600 mb-0.5">운행 중</div>
          <div className="text-lg font-bold text-green-600">{statusStats.running}대</div>
        </div>
        <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-yellow-500">
          <div className="text-xs text-gray-600 mb-0.5">대기</div>
          <div className="text-lg font-bold text-yellow-600">{statusStats.idle}대</div>
        </div>
        <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-orange-500">
          <div className="text-xs text-gray-600 mb-0.5">정비</div>
          <div className="text-lg font-bold text-orange-600">{statusStats.maintenance}대</div>
        </div>
        <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-red-500">
          <div className="text-xs text-gray-600 mb-0.5">고장</div>
          <div className="text-lg font-bold text-red-600">{statusStats.breakdown}대</div>
        </div>
      </div>

      <div className="flex h-[calc(100%-120px)] gap-3">
        {/* 지도 영역 - 브이월드 타일맵 */}
        <div className="flex-1 min-w-0 overflow-auto">
          <div className="relative h-full min-h-[400px] min-w-[600px] rounded-lg overflow-hidden border-2 border-gray-300 bg-white">
            {typeof window !== "undefined" && (
              <MapContainer
                center={[36.5, 127.5]}
                zoom={7}
                style={{ height: "100%", width: "100%" }}
                zoomControl={true}
                preferCanvas={true}
              >
                {/* 브이월드 타일맵 (HTTPS, 캐싱 적용) */}
                <TileLayer
                  url={`https://api.vworld.kr/req/wmts/1.0.0/${VWORLD_API_KEY}/Base/{z}/{y}/{x}.png`}
                  attribution='&copy; <a href="https://www.vworld.kr">VWorld (국토교통부)</a>'
                  maxZoom={19}
                  minZoom={7}
                  updateWhenIdle={true}
                  updateWhenZooming={false}
                  keepBuffer={2}
                />
                
                {/* 차량 마커 */}
                {vehicles.map((vehicle) => (
                  <React.Fragment key={vehicle.id}>
                    <Circle
                      center={[vehicle.lat, vehicle.lng]}
                      radius={150}
                      pathOptions={{
                        color: getStatusColor(vehicle.status),
                        fillColor: getStatusColor(vehicle.status),
                        fillOpacity: 0.3,
                      }}
                    />
                    <Marker 
                      position={[vehicle.lat, vehicle.lng]}
                      eventHandlers={{
                        click: () => setSelectedVehicle(vehicle),
                      }}
                    >
                      <Popup>
                        <div className="text-xs">
                          <div className="font-bold text-sm mb-1">{vehicle.name}</div>
                          <div><strong>기사:</strong> {vehicle.driver}</div>
                          <div><strong>상태:</strong> {getStatusText(vehicle.status)}</div>
                          <div><strong>속도:</strong> {vehicle.speed} km/h</div>
                          <div><strong>거리:</strong> {vehicle.distance} km</div>
                          <div><strong>연료:</strong> {vehicle.fuel} L</div>
                          {vehicle.isRefrigerated && vehicle.temperature !== undefined && (
                            <div><strong>온도:</strong> {vehicle.temperature}°C</div>
                          )}
                        </div>
                      </Popup>
                    </Marker>
                  </React.Fragment>
                ))}
              </MapContainer>
            )}
            
            {/* 지도 정보 */}
            <div className="absolute top-2 right-2 bg-white/90 backdrop-blur-sm rounded-lg p-2 shadow-lg z-[1000]">
              <div className="text-xs text-gray-600">
                <div className="font-semibold mb-1">🗺️ 브이월드 (VWorld)</div>
                <div className="text-xs">국토교통부 공식 지도</div>
              </div>
            </div>
            
            {/* 차량 수 표시 */}
            <div className="absolute bottom-2 left-2 bg-white/90 backdrop-blur-sm rounded-lg p-2 shadow-lg z-[1000]">
              <div className="text-xs font-semibold text-gray-900">
                총 {vehicles.length}대 모니터링 중
              </div>
            </div>
          </div>
        </div>

        {/* 우측 사이드 패널 */}
        <div className="w-80 flex flex-col gap-3 overflow-y-auto max-h-full">
          {/* 차량 목록 */}
          <div className="rounded-lg bg-white shadow-sm border border-gray-200 overflow-hidden">
            <div className="bg-gray-50 border-b border-gray-200 p-3">
              <h4 className="text-sm font-semibold text-gray-900 flex items-center gap-2">
                <Truck className="h-4 w-4 text-gray-600" />
                차량 목록 ({vehicles.length}대)
              </h4>
            </div>
            
            <div className="p-2 max-h-[320px] overflow-y-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100">
              {vehicles.length === 0 ? (
                <div className="py-8 text-center text-sm text-gray-500">
                  차량이 없습니다
                </div>
              ) : (
                <div className="space-y-2">
                  {vehicles.map((vehicle) => (
                    <div
                      key={vehicle.id}
                      onClick={() => setSelectedVehicle(vehicle)}
                      className={`cursor-pointer rounded-lg border p-2 transition-all hover:shadow-sm ${
                        selectedVehicle?.id === vehicle.id
                          ? "border-gray-900 bg-gray-50 ring-1 ring-gray-900"
                          : "border-gray-200 bg-white hover:border-gray-300"
                      }`}
                    >
                      <div className="flex items-center justify-between mb-1">
                        <span className="font-semibold text-sm text-gray-900">
                          {vehicle.name}
                        </span>
                        <span
                          className="rounded-full px-2 py-0.5 text-xs font-semibold text-white"
                          style={{ backgroundColor: getStatusColor(vehicle.status) }}
                        >
                          {getStatusText(vehicle.status)}
                        </span>
                      </div>
                      <div className="text-xs text-gray-600 flex items-center gap-1">
                        <Navigation className="h-3 w-3" />
                        <span className="truncate">{vehicle.destination}</span>
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>

          {/* 선택된 차량 상세 정보 */}
          {selectedVehicle ? (
            <div className="rounded-lg bg-white shadow-sm border border-gray-200 overflow-hidden max-h-[400px] overflow-y-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100">
              {/* 헤더 */}
              <div className="bg-gray-900 p-4">
                <div className="flex items-center justify-between mb-2">
                  <h4 className="text-base font-semibold text-white flex items-center gap-2">
                    <Truck className="h-5 w-5" />
                    {selectedVehicle.name}
                  </h4>
                  <button
                    onClick={() => setSelectedVehicle(null)}
                    className="text-gray-400 hover:text-white transition-colors"
                  >
                    ✕
                  </button>
                </div>
                <div className="flex items-center gap-2">
                  <span
                    className="rounded-full px-3 py-1 text-xs font-semibold text-white"
                    style={{ backgroundColor: getStatusColor(selectedVehicle.status) }}
                  >
                    {getStatusText(selectedVehicle.status)}
                  </span>
                  <span className="text-sm text-gray-400">{selectedVehicle.id}</span>
                </div>
              </div>

              {/* 기사 정보 */}
              <div className="p-4 border-b border-gray-200">
                <h5 className="text-xs font-semibold text-gray-500 mb-2">👤 기사 정보</h5>
                <div className="space-y-1.5">
                  <div className="flex justify-between text-sm">
                    <span className="text-gray-600">이름</span>
                    <span className="font-semibold text-gray-900">{selectedVehicle.driver}</span>
                  </div>
                  <div className="flex justify-between text-sm">
                    <span className="text-gray-600">GPS 좌표</span>
                    <span className="font-mono text-xs text-gray-700">
                      {selectedVehicle.lat.toFixed(4)}, {selectedVehicle.lng.toFixed(4)}
                    </span>
                  </div>
                </div>
              </div>

              {/* 운행 정보 */}
              <div className="p-4 border-b border-gray-200">
                <h5 className="text-xs font-semibold text-gray-500 mb-2">📍 운행 정보</h5>
                <div className="space-y-1.5">
                  <div className="flex justify-between text-sm">
                    <span className="text-gray-600">목적지</span>
                    <span className="font-semibold text-gray-900">{selectedVehicle.destination}</span>
                  </div>
                </div>
              </div>

              {/* 실시간 데이터 */}
              <div className="p-4 border-b border-gray-200">
                <h5 className="text-xs font-semibold text-gray-500 mb-2">📊 실시간 데이터</h5>
                <div className="grid grid-cols-2 gap-2">
                  <div className="bg-gray-50 rounded-lg p-2 border border-gray-200">
                    <div className="text-xs text-gray-600 mb-0.5">현재 속도</div>
                    <div className="text-lg font-bold text-gray-900">{selectedVehicle.speed}</div>
                    <div className="text-xs text-gray-500">km/h</div>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-2 border border-gray-200">
                    <div className="text-xs text-gray-600 mb-0.5">평균 속도</div>
                    <div className="text-lg font-bold text-gray-900">{selectedVehicle.avgSpeed}</div>
                    <div className="text-xs text-gray-500">km/h</div>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-2 border border-gray-200">
                    <div className="text-xs text-gray-600 mb-0.5">운행 거리</div>
                    <div className="text-lg font-bold text-gray-900">{selectedVehicle.distance}</div>
                    <div className="text-xs text-gray-500">km</div>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-2 border border-gray-200">
                    <div className="text-xs text-gray-600 mb-0.5">소모 연료</div>
                    <div className="text-lg font-bold text-gray-900">{selectedVehicle.fuel}</div>
                    <div className="text-xs text-gray-500">L</div>
                  </div>
                </div>
              </div>

              {/* 냉동/냉장 상태 */}
              {selectedVehicle.isRefrigerated && selectedVehicle.temperature !== undefined && (
                <div className="p-4">
                  <h5 className="text-xs font-semibold text-gray-500 mb-3">❄️ 냉동/냉장 상태</h5>
                  <div className="rounded-lg p-4 border border-gray-200 bg-gray-50">
                    <div className="flex items-center justify-between mb-3">
                      <span className="text-sm text-gray-600">현재 온도</span>
                      <span className="text-3xl font-bold text-gray-900">
                        {selectedVehicle.temperature}°C
                      </span>
                    </div>
                    <div className="space-y-2 text-sm">
                      <div className="flex justify-between">
                        <span className="text-gray-600">타입</span>
                        <span className="font-semibold text-gray-900">
                          {selectedVehicle.temperature < -10 ? "냉동" : "냉장"}
                        </span>
                      </div>
                      <div className="flex justify-between">
                        <span className="text-gray-600">적정 범위</span>
                        <span className="font-semibold text-gray-900">
                          {selectedVehicle.temperature < -10 ? "-18°C ~ -15°C" : "0°C ~ 5°C"}
                        </span>
                      </div>
                      <div className="flex justify-between items-center">
                        <span className="text-gray-600">상태</span>
                        <span className={`px-3 py-1 rounded-md text-xs font-semibold border ${
                          Math.abs(selectedVehicle.temperature - (selectedVehicle.temperature < -10 ? -18 : 2)) < 5
                            ? "bg-gray-900 text-white border-gray-900"
                            : "bg-white text-gray-900 border-gray-300"
                        }`}>
                          {Math.abs(selectedVehicle.temperature - (selectedVehicle.temperature < -10 ? -18 : 2)) < 5
                            ? "✓ 정상"
                            : "⚠ 주의"}
                        </span>
                      </div>
                    </div>
                  </div>
                </div>
              )}
            </div>
          ) : (
            <div className="rounded-lg bg-white shadow-lg border border-gray-200 p-8 text-center">
              <Truck className="h-12 w-12 text-gray-300 mx-auto mb-3" />
              <p className="text-sm text-gray-500">차량을 선택하면</p>
              <p className="text-sm text-gray-500">상세 정보가 표시됩니다</p>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}