"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 } from "@/lib/api/batch";

export default function MonitoringPage() {
  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-emerald-500" />;
      case 'failed':
        return <AlertCircle className="h-4 w-4 text-destructive" />;
      case 'running':
        return <Play className="h-4 w-4 text-primary" />;
      case 'pending':
        return <Clock className="h-4 w-4 text-amber-500" />;
      default:
        return <Clock className="h-4 w-4 text-muted-foreground" />;
    }
  };

  const getStatusBadge = (status: string) => {
    const variants = {
      completed: "bg-emerald-100 text-emerald-800",
      failed: "bg-destructive/20 text-red-800",
      running: "bg-primary/20 text-primary",
      pending: "bg-amber-100 text-yellow-800",
      cancelled: "bg-muted text-foreground",
    };

    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="min-h-screen bg-muted">
      <div className="w-full max-w-none px-4 py-8 space-y-8">
        {/* 헤더 */}
        <div>
          <h1 className="text-2xl font-bold">모니터링</h1>
          <p className="text-muted-foreground">
            배치 작업 실행 상태를 실시간으로 모니터링합니다.
          </p>
        </div>

        {/* 모니터링 대시보드 */}
        <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-accent text-primary" : ""}
              >
                {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-primary">{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-emerald-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-destructive">{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-destructive text-sm truncate block">
                              {execution.error_message}
                            </span>
                          ) : (
                            "-"
                          )}
                        </TableCell>
                      </TableRow>
                    ))}
                  </TableBody>
                </Table>
              )}
            </CardContent>
          </Card>
        </div>
      </div>
    </div>
  );
}
