"use client";

import React, { useState, useEffect } from "react";
import { Button } from "@/components/ui/button";
import { RefreshCw, Package, TruckIcon, AlertTriangle, CheckCircle, Clock, XCircle } from "lucide-react";

interface DeliveryItem {
  id: string;
  trackingNumber: string;
  customer: string;
  origin: string;
  destination: string;
  status: "in_transit" | "delivered" | "delayed" | "pickup_waiting";
  estimatedDelivery: string;
  delayReason?: string;
  priority: "high" | "normal" | "low";
}

interface CustomerIssue {
  id: string;
  customer: string;
  trackingNumber: string;
  issueType: "damage" | "delay" | "missing" | "other";
  description: string;
  status: "open" | "in_progress" | "resolved";
  reportedAt: string;
}

interface DeliveryStatusWidgetProps {
  refreshInterval?: number;
}

export default function DeliveryStatusWidget({ refreshInterval = 60000 }: DeliveryStatusWidgetProps) {
  const [deliveries, setDeliveries] = useState<DeliveryItem[]>([]);
  const [issues, setIssues] = useState<CustomerIssue[]>([]);
  const [todayStats, setTodayStats] = useState({
    shipped: 0,
    delivered: 0,
  });
  const [isLoading, setIsLoading] = useState(false);
  const [lastUpdate, setLastUpdate] = useState<Date>(new Date());

  const loadData = async () => {
    setIsLoading(true);

    // TODO: 실제 API 연동 시 아래 주석 해제
    // try {
    //   const response = await fetch('/api/delivery/status', {
    //     headers: {
    //       'Authorization': `Bearer ${localStorage.getItem('authToken')}`,
    //     },
    //   });
    //   const data = await response.json();
    //   setDeliveries(data.deliveries);
    //   setIssues(data.issues);
    //   setTodayStats(data.todayStats);
    //   setLastUpdate(new Date());
    // } catch (error) {
    //   console.error('배송 데이터 로드 실패:', error);
    // } finally {
    //   setIsLoading(false);
    // }

    // 가상 배송 데이터 (개발용 - 실제 DB 연동 시 삭제)
    const dummyDeliveries: DeliveryItem[] = [
      {
        id: "D001",
        trackingNumber: "TRK-2025-001",
        customer: "삼성전자",
        origin: "서울 물류센터",
        destination: "부산 공장",
        status: "in_transit",
        estimatedDelivery: "2025-10-15 14:00",
        priority: "high",
      },
      {
        id: "D002",
        trackingNumber: "TRK-2025-002",
        customer: "LG화학",
        origin: "인천항",
        destination: "광주 공장",
        status: "delivered",
        estimatedDelivery: "2025-10-14 16:30",
        priority: "normal",
      },
      {
        id: "D003",
        trackingNumber: "TRK-2025-003",
        customer: "현대자동차",
        origin: "평택 물류센터",
        destination: "울산 공장",
        status: "delayed",
        estimatedDelivery: "2025-10-14 18:00",
        delayReason: "교통 체증",
        priority: "high",
      },
      {
        id: "D004",
        trackingNumber: "TRK-2025-004",
        customer: "SK하이닉스",
        origin: "이천 물류센터",
        destination: "청주 공장",
        status: "pickup_waiting",
        estimatedDelivery: "2025-10-15 10:00",
        priority: "normal",
      },
      {
        id: "D005",
        trackingNumber: "TRK-2025-005",
        customer: "포스코",
        origin: "포항 물류센터",
        destination: "광양 제철소",
        status: "delayed",
        estimatedDelivery: "2025-10-14 20:00",
        delayReason: "기상 악화",
        priority: "high",
      },
    ];

    // 가상 고객 이슈 데이터
    const dummyIssues: CustomerIssue[] = [
      {
        id: "I001",
        customer: "삼성전자",
        trackingNumber: "TRK-2025-001",
        issueType: "delay",
        description: "배송 지연으로 인한 생산 일정 차질",
        status: "in_progress",
        reportedAt: "2025-10-14 15:30",
      },
      {
        id: "I002",
        customer: "LG디스플레이",
        trackingNumber: "TRK-2024-998",
        issueType: "damage",
        description: "화물 일부 파손",
        status: "open",
        reportedAt: "2025-10-14 14:20",
      },
      {
        id: "I003",
        customer: "SK이노베이션",
        trackingNumber: "TRK-2024-995",
        issueType: "missing",
        description: "화물 일부 누락",
        status: "resolved",
        reportedAt: "2025-10-13 16:45",
      },
    ];

    setTimeout(() => {
      setDeliveries(dummyDeliveries);
      setIssues(dummyIssues);
      setTodayStats({
        shipped: 24,
        delivered: 18,
      });
      setLastUpdate(new Date());
      setIsLoading(false);
    }, 500);
  };

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

  const getStatusColor = (status: DeliveryItem["status"]) => {
    switch (status) {
      case "in_transit":
        return "bg-blue-100 text-blue-700 border-blue-300";
      case "delivered":
        return "bg-green-100 text-green-700 border-green-300";
      case "delayed":
        return "bg-red-100 text-red-700 border-red-300";
      case "pickup_waiting":
        return "bg-yellow-100 text-yellow-700 border-yellow-300";
      default:
        return "bg-gray-100 text-gray-700 border-gray-300";
    }
  };

  const getStatusText = (status: DeliveryItem["status"]) => {
    switch (status) {
      case "in_transit":
        return "배송중";
      case "delivered":
        return "완료";
      case "delayed":
        return "지연";
      case "pickup_waiting":
        return "픽업 대기";
      default:
        return "알 수 없음";
    }
  };

  const getStatusIcon = (status: DeliveryItem["status"]) => {
    switch (status) {
      case "in_transit":
        return <TruckIcon className="h-4 w-4" />;
      case "delivered":
        return <CheckCircle className="h-4 w-4" />;
      case "delayed":
        return <AlertTriangle className="h-4 w-4" />;
      case "pickup_waiting":
        return <Clock className="h-4 w-4" />;
      default:
        return <Package className="h-4 w-4" />;
    }
  };

  const getIssueTypeText = (type: CustomerIssue["issueType"]) => {
    switch (type) {
      case "damage":
        return "파손";
      case "delay":
        return "지연";
      case "missing":
        return "누락";
      case "other":
        return "기타";
      default:
        return "알 수 없음";
    }
  };

  const getIssueStatusColor = (status: CustomerIssue["status"]) => {
    switch (status) {
      case "open":
        return "bg-red-100 text-red-700 border-red-300";
      case "in_progress":
        return "bg-yellow-100 text-yellow-700 border-yellow-300";
      case "resolved":
        return "bg-green-100 text-green-700 border-green-300";
      default:
        return "bg-gray-100 text-gray-700 border-gray-300";
    }
  };

  const getIssueStatusText = (status: CustomerIssue["status"]) => {
    switch (status) {
      case "open":
        return "접수";
      case "in_progress":
        return "처리중";
      case "resolved":
        return "해결";
      default:
        return "알 수 없음";
    }
  };

  const statusStats = {
    in_transit: deliveries.filter((d) => d.status === "in_transit").length,
    delivered: deliveries.filter((d) => d.status === "delivered").length,
    delayed: deliveries.filter((d) => d.status === "delayed").length,
    pickup_waiting: deliveries.filter((d) => d.status === "pickup_waiting").length,
  };

  const delayedDeliveries = deliveries.filter((d) => d.status === "delayed");

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

      {/* 배송 상태 요약 */}
      <div className="mb-3">
        <h4 className="mb-2 text-sm font-semibold text-gray-700">배송 상태 요약</h4>
        <div className="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-blue-500">
            <div className="text-xs text-gray-600 mb-0.5">배송중</div>
            <div className="text-lg font-bold text-blue-600">{statusStats.in_transit}</div>
          </div>
          <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">완료</div>
            <div className="text-lg font-bold text-green-600">{statusStats.delivered}</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">지연</div>
            <div className="text-lg font-bold text-red-600">{statusStats.delayed}</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">픽업 대기</div>
            <div className="text-lg font-bold text-yellow-600">{statusStats.pickup_waiting}</div>
          </div>
        </div>
      </div>

      {/* 오늘 발송/도착 건수 */}
      <div className="mb-3">
        <h4 className="mb-2 text-sm font-semibold text-gray-700">오늘 처리 현황</h4>
        <div className="grid grid-cols-2 gap-2">
          <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-gray-500">
            <div className="text-xs text-gray-600 mb-0.5">발송 건수</div>
            <div className="text-lg font-bold text-gray-900">{todayStats.shipped}</div>
            <div className="text-xs text-gray-500">건</div>
          </div>
          <div className="rounded-lg bg-white p-1.5 shadow-sm border-l-4 border-gray-500">
            <div className="text-xs text-gray-600 mb-0.5">도착 건수</div>
            <div className="text-lg font-bold text-gray-900">{todayStats.delivered}</div>
            <div className="text-xs text-gray-500">건</div>
          </div>
        </div>
      </div>

      {/* 지연 중인 화물 리스트 */}
      <div className="mb-3">
        <h4 className="mb-2 text-sm font-semibold text-gray-700 flex items-center gap-2">
          <AlertTriangle className="h-4 w-4 text-red-600" />
          지연 중인 화물 ({delayedDeliveries.length})
        </h4>
        <div className="rounded-lg bg-white shadow-sm border border-gray-200 overflow-hidden">
          {delayedDeliveries.length === 0 ? (
            <div className="p-6 text-center text-sm text-gray-500">
              지연 중인 화물이 없습니다
            </div>
          ) : (
            <div className="max-h-[200px] overflow-y-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100">
              {delayedDeliveries.map((delivery) => (
                <div
                  key={delivery.id}
                  className="p-3 border-b border-gray-200 last:border-b-0 hover:bg-gray-50 transition-colors"
                >
                  <div className="flex items-start justify-between mb-2">
                    <div>
                      <div className="font-semibold text-sm text-gray-900">{delivery.customer}</div>
                      <div className="text-xs text-gray-600">{delivery.trackingNumber}</div>
                    </div>
                    <span className={`rounded-md px-2 py-1 text-xs font-semibold border ${getStatusColor(delivery.status)}`}>
                      {getStatusText(delivery.status)}
                    </span>
                  </div>
                  <div className="text-xs text-gray-600 space-y-1">
                    <div className="flex items-center gap-1">
                      <span className="font-medium">경로:</span>
                      <span>{delivery.origin} → {delivery.destination}</span>
                    </div>
                    <div className="flex items-center gap-1">
                      <span className="font-medium">예정:</span>
                      <span>{delivery.estimatedDelivery}</span>
                    </div>
                    {delivery.delayReason && (
                      <div className="flex items-center gap-1 text-red-600">
                        <AlertTriangle className="h-3 w-3" />
                        <span className="font-medium">사유:</span>
                        <span>{delivery.delayReason}</span>
                      </div>
                    )}
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>

      {/* 고객 클레임/이슈 리포트 */}
      <div>
        <h4 className="mb-2 text-sm font-semibold text-gray-700 flex items-center gap-2">
          <XCircle className="h-4 w-4 text-orange-600" />
          고객 클레임/이슈 ({issues.filter((i) => i.status !== "resolved").length})
        </h4>
        <div className="rounded-lg bg-white shadow-sm border border-gray-200 overflow-hidden">
          {issues.length === 0 ? (
            <div className="p-6 text-center text-sm text-gray-500">
              이슈가 없습니다
            </div>
          ) : (
            <div className="max-h-[200px] overflow-y-auto scrollbar-thin scrollbar-thumb-gray-300 scrollbar-track-gray-100">
              {issues.map((issue) => (
                <div
                  key={issue.id}
                  className="p-3 border-b border-gray-200 last:border-b-0 hover:bg-gray-50 transition-colors"
                >
                  <div className="flex items-start justify-between mb-2">
                    <div>
                      <div className="font-semibold text-sm text-gray-900">{issue.customer}</div>
                      <div className="text-xs text-gray-600">{issue.trackingNumber}</div>
                    </div>
                    <div className="flex gap-1">
                      <span className="rounded-md px-2 py-1 text-xs font-semibold bg-gray-100 text-gray-700 border border-gray-300">
                        {getIssueTypeText(issue.issueType)}
                      </span>
                      <span className={`rounded-md px-2 py-1 text-xs font-semibold border ${getIssueStatusColor(issue.status)}`}>
                        {getIssueStatusText(issue.status)}
                      </span>
                    </div>
                  </div>
                  <div className="text-xs text-gray-600 space-y-1">
                    <div>{issue.description}</div>
                    <div className="text-gray-500">접수: {issue.reportedAt}</div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>
      </div>
    </div>
  );
}