"use client";

import { useState, useMemo } from "react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Badge } from "@/components/ui/badge";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
  AlertDialogTrigger,
} from "@/components/ui/alert-dialog";
import { Search, Plus, Edit2, Trash2, Eye, Copy, Download, Upload, ArrowUpDown, Filter, RefreshCw } from "lucide-react";
import { LoadingSpinner } from "@/components/common/LoadingSpinner";
import { toast } from "sonner";
import { useTemplates, TemplateStandard } from "@/hooks/admin/useTemplates";
import Link from "next/link";

export default function TemplatesManagePage() {
  const [searchTerm, setSearchTerm] = useState("");
  const [categoryFilter, setCategoryFilter] = useState<string>("all");
  const [activeFilter, setActiveFilter] = useState<string>("Y");
  const [sortField, setSortField] = useState<string>("sort_order");
  const [sortDirection, setSortDirection] = useState<"asc" | "desc">("asc");

  // 템플릿 데이터 조회
  const { templates, categories, isLoading, error, deleteTemplate, isDeleting, deleteError, refetch, exportTemplate } =
    useTemplates({
      active: activeFilter === "all" ? undefined : activeFilter,
      search: searchTerm || undefined,
      category: categoryFilter === "all" ? undefined : categoryFilter,
    });

  // 필터링 및 정렬된 데이터
  const filteredAndSortedTemplates = useMemo(() => {
    let filtered = [...templates];

    // 정렬
    filtered.sort((a, b) => {
      let aValue: any = a[sortField as keyof typeof a];
      let bValue: any = b[sortField as keyof typeof b];

      // 숫자 필드 처리
      if (sortField === "sort_order") {
        aValue = aValue || 0;
        bValue = bValue || 0;
      }

      // 문자열 필드 처리
      if (typeof aValue === "string") {
        aValue = aValue.toLowerCase();
      }
      if (typeof bValue === "string") {
        bValue = bValue.toLowerCase();
      }

      if (aValue < bValue) return sortDirection === "asc" ? -1 : 1;
      if (aValue > bValue) return sortDirection === "asc" ? 1 : -1;
      return 0;
    });

    return filtered;
  }, [templates, sortField, sortDirection]);

  // 정렬 변경 핸들러
  const handleSort = (field: string) => {
    if (sortField === field) {
      setSortDirection(sortDirection === "asc" ? "desc" : "asc");
    } else {
      setSortField(field);
      setSortDirection("asc");
    }
  };

  // 삭제 핸들러
  const handleDelete = async (templateCode: string, templateName: string) => {
    try {
      await deleteTemplate(templateCode);
      toast.success(`템플릿 '${templateName}'이 삭제되었습니다.`);
    } catch (error) {
      toast.error(`템플릿 삭제 중 오류가 발생했습니다: ${deleteError?.message || error}`);
    }
  };

  // 내보내기 핸들러
  const handleExport = async (templateCode: string, templateName: string) => {
    try {
      const templateData = await exportTemplate(templateCode);

      // JSON 파일로 다운로드
      const blob = new Blob([JSON.stringify(templateData, null, 2)], {
        type: "application/json",
      });
      const url = URL.createObjectURL(blob);
      const a = document.createElement("a");
      a.href = url;
      a.download = `template-${templateCode}.json`;
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
      URL.revokeObjectURL(url);

      toast.success(`템플릿 '${templateName}'이 내보내기되었습니다.`);
    } catch (error: any) {
      toast.error(`템플릿 내보내기 중 오류가 발생했습니다: ${error.message}`);
    }
  };

  // 아이콘 렌더링 함수
  const renderIcon = (iconName?: string) => {
    if (!iconName) return null;

    // 간단한 아이콘 매핑 (실제로는 더 복잡한 시스템 필요)
    const iconMap: Record<string, JSX.Element> = {
      table: <div className="h-4 w-4 border border-input" />,
      "mouse-pointer": <div className="h-4 w-4 rounded bg-primary" />,
      upload: <div className="h-4 w-4 border-2 border-dashed border-input" />,
    };

    return iconMap[iconName] || <div className="h-4 w-4 rounded bg-muted/60" />;
  };

  if (error) {
    return (
      <div className="w-full max-w-none px-4 py-8">
        <Card>
          <CardContent className="flex flex-col items-center justify-center py-8">
            <p className="mb-4 text-destructive">템플릿 목록을 불러오는 중 오류가 발생했습니다.</p>
            <Button onClick={() => refetch()} variant="outline">
              <RefreshCw className="mr-2 h-4 w-4" />
              다시 시도
            </Button>
          </CardContent>
        </Card>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-muted">
      <div className="w-full max-w-none px-4 py-8 space-y-8">
        {/* 페이지 제목 */}
        <div className="flex items-center justify-between bg-white rounded-lg shadow-sm border p-6">
          <div>
            <h1 className="text-3xl font-bold text-foreground">템플릿 관리</h1>
            <p className="mt-2 text-muted-foreground">화면 디자이너에서 사용할 템플릿을 관리합니다</p>
          </div>
          <div className="flex space-x-2">
            <Button asChild className="shadow-sm">
              <Link href="/admin/templates/new">
                <Plus className="mr-2 h-4 w-4" />새 템플릿
              </Link>
            </Button>
          </div>
        </div>

      {/* 필터 및 검색 */}
      <Card className="shadow-sm">
        <CardHeader className="bg-muted/50">
          <CardTitle className="flex items-center">
            <Filter className="mr-2 h-5 w-5 text-muted-foreground" />
            필터 및 검색
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 gap-4 md:grid-cols-2 lg:grid-cols-4">
            {/* 검색 */}
            <div className="space-y-2">
              <label className="text-sm font-medium">검색</label>
              <div className="relative">
                <Search className="absolute top-1/2 left-3 h-4 w-4 -translate-y-1/2 text-muted-foreground/70" />
                <Input
                  placeholder="템플릿명, 설명 검색..."
                  value={searchTerm}
                  onChange={(e) => setSearchTerm(e.target.value)}
                  className="pl-10"
                />
              </div>
            </div>

            {/* 카테고리 필터 */}
            <div className="space-y-2">
              <label className="text-sm font-medium">카테고리</label>
              <Select value={categoryFilter} onValueChange={setCategoryFilter}>
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">전체</SelectItem>
                  {categories.map((category) => (
                    <SelectItem key={category} value={category}>
                      {category}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>

            {/* 활성화 상태 필터 */}
            <div className="space-y-2">
              <label className="text-sm font-medium">활성화 상태</label>
              <Select value={activeFilter} onValueChange={setActiveFilter}>
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">전체</SelectItem>
                  <SelectItem value="Y">활성화</SelectItem>
                  <SelectItem value="N">비활성화</SelectItem>
                </SelectContent>
              </Select>
            </div>

            {/* 새로고침 버튼 */}
            <div className="flex items-end">
              <Button onClick={() => refetch()} variant="outline" className="w-full">
                <RefreshCw className="mr-2 h-4 w-4" />
                새로고침
              </Button>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* 템플릿 목록 테이블 */}
      <Card className="shadow-sm">
        <CardHeader className="bg-muted/50">
          <CardTitle>템플릿 목록 ({filteredAndSortedTemplates.length}개)</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="rounded-md border">
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead className="h-12 px-6 py-3 w-[60px]">
                    <Button
                      variant="ghost"
                      size="sm"
                      onClick={() => handleSort("sort_order")}
                      className="h-8 p-0 font-medium"
                    >
                      순서
                      <ArrowUpDown className="ml-1 h-3 w-3" />
                    </Button>
                  </TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">
                    <Button
                      variant="ghost"
                      size="sm"
                      onClick={() => handleSort("template_code")}
                      className="h-8 p-0 font-medium"
                    >
                      템플릿 코드
                      <ArrowUpDown className="ml-1 h-3 w-3" />
                    </Button>
                  </TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">
                    <Button
                      variant="ghost"
                      size="sm"
                      onClick={() => handleSort("template_name")}
                      className="h-8 p-0 font-medium"
                    >
                      템플릿명
                      <ArrowUpDown className="ml-1 h-3 w-3" />
                    </Button>
                  </TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">카테고리</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">설명</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">아이콘</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">기본 크기</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">공개 여부</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">활성화</TableHead>
                  <TableHead className="h-12 px-6 py-3 text-sm font-semibold">수정일</TableHead>
                  <TableHead className="h-12 px-6 py-3 w-[200px] text-sm font-semibold">작업</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {isLoading ? (
                  <TableRow>
                    <TableCell colSpan={11} className="py-8 text-center">
                      <LoadingSpinner />
                      <span className="ml-2">템플릿 목록을 불러오는 중...</span>
                    </TableCell>
                  </TableRow>
                ) : filteredAndSortedTemplates.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={11} className="py-8 text-center text-muted-foreground">
                      검색 조건에 맞는 템플릿이 없습니다.
                    </TableCell>
                  </TableRow>
                ) : (
                  filteredAndSortedTemplates.map((template) => (
                    <TableRow key={template.template_code} className="bg-background transition-colors hover:bg-muted/50">
                      <TableCell className="h-16 px-6 py-3 font-mono text-sm">{template.sort_order || 0}</TableCell>
                      <TableCell className="h-16 px-6 py-3 font-mono text-sm">{template.template_code}</TableCell>
                      <TableCell className="h-16 px-6 py-3 font-medium text-sm">
                        {template.template_name}
                        {template.template_name_eng && (
                          <div className="text-muted-foreground text-xs">{template.template_name_eng}</div>
                        )}
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 text-sm">
                        <Badge variant="secondary">{template.category}</Badge>
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 max-w-xs truncate text-sm">{template.description || "-"}</TableCell>
                      <TableCell className="h-16 px-6 py-3 text-sm">
                        <div className="flex items-center justify-center">{renderIcon(template.icon_name)}</div>
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 font-mono text-xs">
                        {template.default_size ? `${template.default_size.width}×${template.default_size.height}` : "-"}
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 text-sm">
                        <Badge variant={template.is_public === "Y" ? "default" : "secondary"}>
                          {template.is_public === "Y" ? "공개" : "비공개"}
                        </Badge>
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 text-sm">
                        <Badge variant={template.is_active === "Y" ? "default" : "secondary"}>
                          {template.is_active === "Y" ? "활성화" : "비활성화"}
                        </Badge>
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 text-muted-foreground text-sm">
                        {template.updated_date ? new Date(template.updated_date).toLocaleDateString("ko-KR") : "-"}
                      </TableCell>
                      <TableCell className="h-16 px-6 py-3 text-sm">
                        <div className="flex space-x-1">
                          <Button asChild size="sm" variant="ghost">
                            <Link href={`/admin/templates/${template.template_code}`}>
                              <Eye className="h-4 w-4" />
                            </Link>
                          </Button>
                          <Button asChild size="sm" variant="ghost">
                            <Link href={`/admin/templates/${template.template_code}/edit`}>
                              <Edit2 className="h-4 w-4" />
                            </Link>
                          </Button>
                          <Button
                            size="sm"
                            variant="ghost"
                            onClick={() => handleExport(template.template_code, template.template_name)}
                          >
                            <Download className="h-4 w-4" />
                          </Button>
                          <Button asChild size="sm" variant="ghost">
                            <Link href={`/admin/templates/${template.template_code}/duplicate`}>
                              <Copy className="h-4 w-4" />
                            </Link>
                          </Button>
                          <AlertDialog>
                            <AlertDialogTrigger asChild>
                              <Button size="sm" variant="ghost" className="text-destructive hover:text-destructive">
                                <Trash2 className="h-4 w-4" />
                              </Button>
                            </AlertDialogTrigger>
                            <AlertDialogContent>
                              <AlertDialogHeader>
                                <AlertDialogTitle>템플릿 삭제</AlertDialogTitle>
                                <AlertDialogDescription>
                                  템플릿 &apos;{template.template_name}&apos;을 정말 삭제하시겠습니까?
                                  <br />이 작업은 되돌릴 수 없습니다.
                                </AlertDialogDescription>
                              </AlertDialogHeader>
                              <AlertDialogFooter>
                                <AlertDialogCancel>취소</AlertDialogCancel>
                                <AlertDialogAction
                                  onClick={() => handleDelete(template.template_code, template.template_name)}
                                  className="bg-destructive hover:bg-red-700"
                                  disabled={isDeleting}
                                >
                                  삭제
                                </AlertDialogAction>
                              </AlertDialogFooter>
                            </AlertDialogContent>
                          </AlertDialog>
                        </div>
                      </TableCell>
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
          </div>
        </CardContent>
      </Card>
      </div>
    </div>
  );
}
