/**
 * DDL 로그 뷰어 컴포넌트
 * DDL 실행 로그와 통계를 표시
 */

"use client";

import { useState, useEffect } from "react";
import { 
  Dialog, 
  DialogContent, 
  DialogHeader, 
  DialogTitle,
  DialogFooter 
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import {
  RefreshCw,
  Search,
  Calendar,
  User,
  Database,
  CheckCircle2,
  XCircle,
  BarChart3,
  Clock,
  Trash2,
} from "lucide-react";
import { toast } from "sonner";
import { showErrorToast } from "@/lib/utils/toastUtils";
import { format } from "date-fns";
import { ko } from "date-fns/locale";
import { ddlApi } from "../../lib/api/ddl";
import { DDLLogViewerProps, DDLExecutionLog, DDLStatistics } from "../../types/ddl";

export function DDLLogViewer({ isOpen, onClose }: DDLLogViewerProps) {
  const [logs, setLogs] = useState<DDLExecutionLog[]>([]);
  const [statistics, setStatistics] = useState<DDLStatistics | null>(null);
  const [loading, setLoading] = useState(false);
  const [refreshing, setRefreshing] = useState(false);

  // 필터 상태
  const [userFilter, setUserFilter] = useState("");
  const [ddlTypeFilter, setDdlTypeFilter] = useState("all");
  const [limit, setLimit] = useState(50);

  /**
   * 로그 및 통계 로드
   */
  const loadData = async (showLoading = true) => {
    if (showLoading) setLoading(true);
    setRefreshing(true);

    try {
      // 로그와 통계를 병렬로 로드
      const [logsResult, statsResult] = await Promise.all([
        ddlApi.getDDLLogs({
          limit,
          userId: userFilter || undefined,
          ddlType: ddlTypeFilter === "all" ? undefined : ddlTypeFilter,
        }),
        ddlApi.getDDLStatistics(),
      ]);

      setLogs(logsResult.logs);
      setStatistics(statsResult);
    } catch (error) {
      // console.error("DDL 로그 로드 실패:", error);
      showErrorToast("DDL 로그를 불러오는 데 실패했습니다", error, { guidance: "네트워크 연결을 확인해 주세요." });
    } finally {
      if (showLoading) setLoading(false);
      setRefreshing(false);
    }
  };

  /**
   * 필터 적용
   */
  const applyFilters = () => {
    loadData(false);
  };

  /**
   * 필터 초기화
   */
  const resetFilters = () => {
    setUserFilter("");
    setDdlTypeFilter("");
    setLimit(50);
  };

  /**
   * 로그 정리
   */
  const cleanupLogs = async () => {
    if (!confirm("90일 이전의 오래된 로그를 삭제하시겠습니까?")) {
      return;
    }

    try {
      const result = await ddlApi.cleanupOldLogs(90);
      toast.success(`${result.deletedCount}개의 오래된 로그가 삭제되었습니다.`);
      loadData(false);
    } catch (error) {
      // console.error("로그 정리 실패:", error);
      showErrorToast("로그 정리에 실패했습니다", error, { guidance: "잠시 후 다시 시도해 주세요." });
    }
  };

  /**
   * 컴포넌트 마운트 시 데이터 로드
   */
  useEffect(() => {
    if (isOpen) {
      loadData();
    }
  }, [isOpen]);

  /**
   * DDL 타입 배지 색상
   */
  const getDDLTypeBadgeVariant = (ddlType: string) => {
    switch (ddlType) {
      case "CREATE_TABLE":
        return "default";
      case "ADD_COLUMN":
        return "secondary";
      case "DROP_TABLE":
        return "destructive";
      case "DROP_COLUMN":
        return "outline";
      default:
        return "outline";
    }
  };

  /**
   * 성공률 계산
   */
  const getSuccessRate = (stats: DDLStatistics) => {
    if (stats.totalExecutions === 0) return 0;
    return Math.round((stats.successfulExecutions / stats.totalExecutions) * 100);
  };

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent className="max-h-[90vh] max-w-7xl overflow-hidden">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <Database className="h-5 w-5" />
            DDL 실행 로그 및 통계
          </DialogTitle>
        </DialogHeader>

        <Tabs defaultValue="logs" className="w-full">
          <TabsList className="grid w-full grid-cols-2">
            <TabsTrigger value="logs">실행 로그</TabsTrigger>
            <TabsTrigger value="statistics">통계</TabsTrigger>
          </TabsList>

          {/* 실행 로그 탭 */}
          <TabsContent value="logs" className="space-y-4">
            {/* 필터 및 컨트롤 */}
            <div className="bg-muted/50 flex flex-wrap items-center gap-2 rounded-lg p-4">
              <div className="flex items-center gap-2">
                <User className="h-4 w-4" />
                <Input
                  placeholder="사용자 ID"
                  value={userFilter}
                  onChange={(e) => setUserFilter(e.target.value)}
                  className="w-32"
                />
              </div>

              <Select value={ddlTypeFilter} onValueChange={setDdlTypeFilter}>
                <SelectTrigger className="w-40">
                  <SelectValue placeholder="DDL 타입" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">전체</SelectItem>
                  <SelectItem value="CREATE_TABLE">테이블 생성</SelectItem>
                  <SelectItem value="ADD_COLUMN">컬럼 추가</SelectItem>
                  <SelectItem value="DROP_TABLE">테이블 삭제</SelectItem>
                  <SelectItem value="DROP_COLUMN">컬럼 삭제</SelectItem>
                </SelectContent>
              </Select>

              <Select value={limit.toString()} onValueChange={(value) => setLimit(parseInt(value))}>
                <SelectTrigger className="w-24">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="25">25개</SelectItem>
                  <SelectItem value="50">50개</SelectItem>
                  <SelectItem value="100">100개</SelectItem>
                  <SelectItem value="200">200개</SelectItem>
                </SelectContent>
              </Select>

              <Button onClick={applyFilters} size="sm">
                <Search className="mr-1 h-4 w-4" />
                검색
              </Button>

              <Button onClick={resetFilters} variant="outline" size="sm">
                초기화
              </Button>

              <div className="flex-1" />

              <Button onClick={() => loadData(false)} disabled={refreshing} variant="outline" size="sm">
                <RefreshCw className={`mr-1 h-4 w-4 ${refreshing ? "animate-spin" : ""}`} />
                새로고침
              </Button>

              <Button onClick={cleanupLogs} variant="outline" size="sm">
                <Trash2 className="mr-1 h-4 w-4" />
                로그 정리
              </Button>
            </div>

            {/* 로그 테이블 */}
            {loading ? (
              <div className="flex items-center justify-center py-8">
                <RefreshCw className="mr-2 h-6 w-6 animate-spin" />
                로그를 불러오는 중...
              </div>
            ) : (
              <div className="rounded-lg border">
                <Table>
                  <TableHeader>
                    <TableRow>
                      <TableHead>실행 시간</TableHead>
                      <TableHead>사용자</TableHead>
                      <TableHead>DDL 타입</TableHead>
                      <TableHead>테이블명</TableHead>
                      <TableHead>결과</TableHead>
                      <TableHead>쿼리 미리보기</TableHead>
                    </TableRow>
                  </TableHeader>
                  <TableBody>
                    {logs.length === 0 ? (
                      <TableRow>
                        <TableCell colSpan={6} className="text-muted-foreground py-8 text-center">
                          표시할 로그가 없습니다.
                        </TableCell>
                      </TableRow>
                    ) : (
                      logs.map((log) => (
                        <TableRow key={log.id}>
                          <TableCell>
                            <div className="flex items-center gap-1 text-sm">
                              <Clock className="h-3 w-3" />
                              {format(new Date(log.executed_at), "yyyy-MM-dd HH:mm:ss", { locale: ko })}
                            </div>
                          </TableCell>

                          <TableCell>
                            <Badge variant="outline">{log.user_id}</Badge>
                          </TableCell>

                          <TableCell>
                            <Badge variant={getDDLTypeBadgeVariant(log.ddl_type)}>{log.ddl_type}</Badge>
                          </TableCell>

                          <TableCell>
                            <code className="bg-muted rounded px-2 py-1 text-sm">{log.table_name}</code>
                          </TableCell>

                          <TableCell>
                            <div className="flex items-center gap-2">
                              {log.success ? (
                                <CheckCircle2 className="h-4 w-4 text-emerald-600" />
                              ) : (
                                <XCircle className="h-4 w-4 text-destructive" />
                              )}
                              <span className={log.success ? "text-emerald-600" : "text-destructive"}>
                                {log.success ? "성공" : "실패"}
                              </span>
                            </div>
                            {log.error_message && (
                              <div className="mt-1 max-w-xs truncate text-xs text-destructive">{log.error_message}</div>
                            )}
                          </TableCell>

                          <TableCell>
                            <code className="text-muted-foreground block max-w-xs truncate text-xs">
                              {log.ddl_query_preview}
                            </code>
                          </TableCell>
                        </TableRow>
                      ))
                    )}
                  </TableBody>
                </Table>
              </div>
            )}
          </TabsContent>

          {/* 통계 탭 */}
          <TabsContent value="statistics" className="space-y-4">
            {statistics && (
              <div className="grid gap-4">
                {/* 전체 통계 */}
                <div className="grid grid-cols-1 gap-4 md:grid-cols-4">
                  <Card>
                    <CardHeader className="pb-2">
                      <CardTitle className="text-sm font-medium">전체 실행</CardTitle>
                    </CardHeader>
                    <CardContent>
                      <div className="text-2xl font-bold">{statistics.totalExecutions}</div>
                    </CardContent>
                  </Card>

                  <Card>
                    <CardHeader className="pb-2">
                      <CardTitle className="text-sm font-medium">성공</CardTitle>
                    </CardHeader>
                    <CardContent>
                      <div className="text-2xl font-bold text-emerald-600">{statistics.successfulExecutions}</div>
                    </CardContent>
                  </Card>

                  <Card>
                    <CardHeader className="pb-2">
                      <CardTitle className="text-sm font-medium">실패</CardTitle>
                    </CardHeader>
                    <CardContent>
                      <div className="text-2xl font-bold text-destructive">{statistics.failedExecutions}</div>
                    </CardContent>
                  </Card>

                  <Card>
                    <CardHeader className="pb-2">
                      <CardTitle className="text-sm font-medium">성공률</CardTitle>
                    </CardHeader>
                    <CardContent>
                      <div className="text-2xl font-bold">{getSuccessRate(statistics)}%</div>
                    </CardContent>
                  </Card>
                </div>

                {/* DDL 타입별 통계 */}
                <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
                  <Card>
                    <CardHeader>
                      <CardTitle className="text-base">DDL 타입별 실행 횟수</CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-2">
                      {Object.entries(statistics.byDDLType).map(([type, count]) => (
                        <div key={type} className="flex items-center justify-between">
                          <Badge variant={getDDLTypeBadgeVariant(type)}>{type}</Badge>
                          <span className="font-medium">{count}회</span>
                        </div>
                      ))}
                    </CardContent>
                  </Card>

                  <Card>
                    <CardHeader>
                      <CardTitle className="text-base">사용자별 실행 횟수</CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-2">
                      {Object.entries(statistics.byUser).map(([user, count]) => (
                        <div key={user} className="flex items-center justify-between">
                          <Badge variant="outline">{user}</Badge>
                          <span className="font-medium">{count}회</span>
                        </div>
                      ))}
                    </CardContent>
                  </Card>
                </div>

                {/* 최근 실패 로그 */}
                {statistics.recentFailures.length > 0 && (
                  <Card>
                    <CardHeader>
                      <CardTitle className="text-base text-destructive">최근 실패 로그</CardTitle>
                      <CardDescription>최근 발생한 DDL 실행 실패 내역입니다.</CardDescription>
                    </CardHeader>
                    <CardContent>
                      <div className="space-y-2">
                        {statistics.recentFailures.map((failure, index) => (
                          <div key={index} className="rounded-lg border border-destructive/20 bg-destructive/10 p-3">
                            <div className="mb-1 flex items-center justify-between">
                              <div className="flex items-center gap-2">
                                <Badge variant={getDDLTypeBadgeVariant(failure.ddl_type)}>{failure.ddl_type}</Badge>
                                <code className="text-sm">{failure.table_name}</code>
                              </div>
                              <span className="text-muted-foreground text-xs">
                                {format(new Date(failure.executed_at), "MM-dd HH:mm", { locale: ko })}
                              </span>
                            </div>
                            <div className="text-sm text-destructive">{failure.error_message}</div>
                          </div>
                        ))}
                      </div>
                    </CardContent>
                  </Card>
                )}
              </div>
            )}
          </TabsContent>
        </Tabs>
      </DialogContent>
    </Dialog>
  );
}
