"use client";

import React, { useState, useEffect } from "react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Progress } from "@/components/ui/progress";
import { RefreshCw, Play, Pause, AlertCircle, CheckCircle, Clock } from "lucide-react";
import { toast } from "sonner";
import { BatchAPI, BatchMonitoring, BatchExecution } from "@/lib/api/batch";

export default function MonitoringDashboard() {
  const [monitoring, setMonitoring] = useState<BatchMonitoring | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [autoRefresh, setAutoRefresh] = useState(false);

  useEffect(() => {
    loadMonitoringData();
    
    let interval: NodeJS.Timeout;
    if (autoRefresh) {
      interval = setInterval(loadMonitoringData, 30000); // 30초마다 자동 새로고침
    }
    
    return () => {
      if (interval) clearInterval(interval);
    };
  }, [autoRefresh]);

  const loadMonitoringData = async () => {
    setIsLoading(true);
    try {
      const data = await BatchAPI.getBatchMonitoring();
      setMonitoring(data);
    } catch (error) {
      console.error("모니터링 데이터 조회 오류:", error);
      toast.error("모니터링 데이터를 불러오는데 실패했습니다.");
    } finally {
      setIsLoading(false);
    }
  };

  const handleRefresh = () => {
    loadMonitoringData();
  };

  const toggleAutoRefresh = () => {
    setAutoRefresh(!autoRefresh);
  };

  const getStatusIcon = (status: string) => {
    switch (status) {
      case 'completed':
        return <CheckCircle className="h-4 w-4 text-green-500" />;
      case 'failed':
        return <AlertCircle className="h-4 w-4 text-red-500" />;
      case 'running':
        return <Play className="h-4 w-4 text-blue-500" />;
      case 'pending':
        return <Clock className="h-4 w-4 text-yellow-500" />;
      default:
        return <Clock className="h-4 w-4 text-gray-500" />;
    }
  };

  const getStatusBadge = (status: string) => {
    const variants = {
      completed: "bg-green-100 text-green-800",
      failed: "bg-red-100 text-red-800",
      running: "bg-blue-100 text-blue-800",
      pending: "bg-yellow-100 text-yellow-800",
      cancelled: "bg-gray-100 text-gray-800",
    };

    const labels = {
      completed: "완료",
      failed: "실패",
      running: "실행 중",
      pending: "대기 중",
      cancelled: "취소됨",
    };

    return (
      <Badge className={variants[status as keyof typeof variants] || variants.pending}>
        {labels[status as keyof typeof labels] || status}
      </Badge>
    );
  };

  const formatDuration = (ms: number) => {
    if (ms < 1000) return `${ms}ms`;
    if (ms < 60000) return `${(ms / 1000).toFixed(1)}s`;
    return `${(ms / 60000).toFixed(1)}m`;
  };

  const getSuccessRate = () => {
    if (!monitoring) return 0;
    const total = monitoring.successful_jobs_today + monitoring.failed_jobs_today;
    if (total === 0) return 100;
    return Math.round((monitoring.successful_jobs_today / total) * 100);
  };

  if (!monitoring) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="text-center">
          <RefreshCw className="h-8 w-8 animate-spin mx-auto mb-2" />
          <p>모니터링 데이터를 불러오는 중...</p>
        </div>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* 헤더 */}
      <div className="flex items-center justify-between">
        <h2 className="text-2xl font-bold">배치 모니터링</h2>
        <div className="flex items-center gap-2">
          <Button
            variant="outline"
            size="sm"
            onClick={toggleAutoRefresh}
            className={autoRefresh ? "bg-blue-50 text-blue-600" : ""}
          >
            {autoRefresh ? <Pause className="h-4 w-4 mr-1" /> : <Play className="h-4 w-4 mr-1" />}
            자동 새로고침
          </Button>
          <Button
            variant="outline"
            size="sm"
            onClick={handleRefresh}
            disabled={isLoading}
          >
            <RefreshCw className={`h-4 w-4 mr-1 ${isLoading ? 'animate-spin' : ''}`} />
            새로고침
          </Button>
        </div>
      </div>

      {/* 통계 카드 */}
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
        <Card>
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium">총 작업 수</CardTitle>
            <div className="text-2xl">📋</div>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold">{monitoring.total_jobs}</div>
            <p className="text-xs text-muted-foreground">
              활성: {monitoring.active_jobs}개
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium">실행 중</CardTitle>
            <div className="text-2xl">🔄</div>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-blue-600">{monitoring.running_jobs}</div>
            <p className="text-xs text-muted-foreground">
              현재 실행 중인 작업
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium">오늘 성공</CardTitle>
            <div className="text-2xl">✅</div>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-green-600">{monitoring.successful_jobs_today}</div>
            <p className="text-xs text-muted-foreground">
              성공률: {getSuccessRate()}%
            </p>
          </CardContent>
        </Card>

        <Card>
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium">오늘 실패</CardTitle>
            <div className="text-2xl">❌</div>
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-red-600">{monitoring.failed_jobs_today}</div>
            <p className="text-xs text-muted-foreground">
              주의가 필요한 작업
            </p>
          </CardContent>
        </Card>
      </div>

      {/* 성공률 진행바 */}
      <Card>
        <CardHeader>
          <CardTitle className="text-lg">오늘 실행 성공률</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-2">
            <div className="flex justify-between text-sm">
              <span>성공: {monitoring.successful_jobs_today}건</span>
              <span>실패: {monitoring.failed_jobs_today}건</span>
            </div>
            <Progress value={getSuccessRate()} className="h-2" />
            <div className="text-center text-sm text-muted-foreground">
              {getSuccessRate()}% 성공률
            </div>
          </div>
        </CardContent>
      </Card>

      {/* 최근 실행 이력 */}
      <Card>
        <CardHeader>
          <CardTitle className="text-lg">최근 실행 이력</CardTitle>
        </CardHeader>
        <CardContent>
          {monitoring.recent_executions.length === 0 ? (
            <div className="text-center py-8 text-muted-foreground">
              최근 실행 이력이 없습니다.
            </div>
          ) : (
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead>상태</TableHead>
                  <TableHead>작업 ID</TableHead>
                  <TableHead>시작 시간</TableHead>
                  <TableHead>완료 시간</TableHead>
                  <TableHead>실행 시간</TableHead>
                  <TableHead>오류 메시지</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {monitoring.recent_executions.map((execution) => (
                  <TableRow key={execution.id}>
                    <TableCell>
                      <div className="flex items-center gap-2">
                        {getStatusIcon(execution.execution_status)}
                        {getStatusBadge(execution.execution_status)}
                      </div>
                    </TableCell>
                    <TableCell className="font-mono">#{execution.job_id}</TableCell>
                    <TableCell>
                      {execution.started_at
                        ? new Date(execution.started_at).toLocaleString()
                        : "-"}
                    </TableCell>
                    <TableCell>
                      {execution.completed_at
                        ? new Date(execution.completed_at).toLocaleString()
                        : "-"}
                    </TableCell>
                    <TableCell>
                      {execution.execution_time_ms
                        ? formatDuration(execution.execution_time_ms)
                        : "-"}
                    </TableCell>
                    <TableCell className="max-w-xs">
                      {execution.error_message ? (
                        <span className="text-red-600 text-sm truncate block">
                          {execution.error_message}
                        </span>
                      ) : (
                        "-"
                      )}
                    </TableCell>
                  </TableRow>
                ))}
              </TableBody>
            </Table>
          )}
        </CardContent>
      </Card>
    </div>
  );
}