// components/purchase-requests/create-purchase-request-dialog.tsx
"use client";

import * as React from "react";
import { useForm, useFieldArray } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import * as z from "zod";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Button } from "@/components/ui/button";
import { Calendar } from "@/components/ui/calendar";
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover";
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 { ProjectSelector } from "@/components/ProjectSelector";
import { PackageSelector } from "@/components/PackageSelector";
import type { PackageItem } from "@/lib/items/service";
import { MaterialGroupSelector } from "@/components/common/material/material-group-selector";
import {
  Dropzone,
  DropzoneDescription,
  DropzoneInput,
  DropzoneTitle,
  DropzoneUploadIcon,
  DropzoneZone,
} from "@/components/ui/dropzone";
import {
  FileList,
  FileListAction,
  FileListDescription,
  FileListHeader,
  FileListIcon,
  FileListInfo,
  FileListItem,
  FileListName,
  FileListSize,
} from "@/components/ui/file-list";
import { Progress } from "@/components/ui/progress";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { CalendarIcon, X, Plus, FileText, Package, Trash2, Upload, FileIcon, AlertCircle, Paperclip } from "lucide-react";
import { format } from "date-fns";
import { cn } from "@/lib/utils";
import { createPurchaseRequest } from "../service";
import { toast } from "sonner";
import { nanoid } from "nanoid";

const attachmentSchema = z.object({
  fileName: z.string(),
  originalFileName: z.string(),
  filePath: z.string(),
  fileSize: z.number(),
  fileType: z.string(),
});

const itemSchema = z.object({
  id: z.string(),
  itemCode: z.string(),
  itemName: z.string().min(1, "아이템명을 입력해주세요"),
  specification: z.string().default(""),
  quantity: z.coerce.number().min(1, "수량은 1 이상이어야 합니다"),
  unit: z.string().min(1, "단위를 입력해주세요"),
  estimatedUnitPrice: z.coerce.number().optional(),
  remarks: z.string().optional(),
});

const formSchema = z.object({
  requestTitle: z.string().min(1, "요청 제목을 입력해주세요"),
  requestDescription: z.string().optional(),
  projectId: z.number({
    required_error: "프로젝트를 선택해주세요",
  }),
  projectCode: z.string().min(1),
  projectName: z.string().min(1),
  projectCompany: z.string().optional(),
  projectSite: z.string().optional(),
  classNo: z.string().optional(),
  packageNo: z.string({
    required_error: "패키지를 선택해주세요",
  }).min(1, "패키지를 선택해주세요"),
  packageName: z.string().min(1),
  majorItemMaterialCategory: z.string({
    required_error: "자재그룹을 선택해주세요",
  }).min(1, "자재그룹을 선택해주세요"),
  majorItemMaterialDescription: z.string().min(1),
  smCode: z.string({
    required_error: "SM 코드가 필요합니다",
  }).min(1, "SM 코드가 필요합니다"),
  estimatedBudget: z.string().optional(),
  requestedDeliveryDate: z.date().optional(),
  items: z.array(itemSchema).optional().default([]),
  attachments: z.array(attachmentSchema).min(1, "최소 1개 이상의 파일을 첨부해주세요"),
});

type FormData = z.infer<typeof formSchema>;

interface CreatePurchaseRequestDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSuccess?: () => void;
}

export function CreatePurchaseRequestDialog({
  open,
  onOpenChange,
  onSuccess,
}: CreatePurchaseRequestDialogProps) {
  const [isLoading, setIsLoading] = React.useState(false);
  const [activeTab, setActiveTab] = React.useState("basic");
  const [selectedPackage, setSelectedPackage] = React.useState<PackageItem | null>(null);
  const [selectedMaterials, setSelectedMaterials] = React.useState<any[]>([]);
  const [resetKey, setResetKey] = React.useState(0);
  const [uploadedFiles, setUploadedFiles] = React.useState<File[]>([]);
  const [isUploading, setIsUploading] = React.useState(false);
  const [uploadProgress, setUploadProgress] = React.useState(0);

  const form = useForm<FormData>({
    resolver: zodResolver(formSchema),
    mode: "onChange",
    criteriaMode: "all",
    defaultValues: {
      requestTitle: "",
      requestDescription: "",
      projectId: undefined,
      projectCode: "",
      projectName: "",
      projectCompany: "",
      projectSite: "",
      classNo: "",
      packageNo: "",
      packageName: "",
      majorItemMaterialCategory: "",
      majorItemMaterialDescription: "",
      smCode: "",
      estimatedBudget: "",
      requestedDeliveryDate: undefined,
      items: [],
      attachments: [],
    },
  });

  const { fields, append, remove } = useFieldArray({
    control: form.control,
    name: "items",
  });

  // 파일 업로드 핸들러
  const handleFileUpload = async (files: File[]) => {
    if (files.length === 0) return;

    setIsUploading(true);
    setUploadProgress(0);

    try {
      const formData = new FormData();
      files.forEach(file => {
        formData.append("files", file);
      });

      // 프로그레스 시뮬레이션 (실제로는 XMLHttpRequest 또는 fetch with progress를 사용)
      const progressInterval = setInterval(() => {
        setUploadProgress(prev => Math.min(prev + 10, 90));
      }, 200);

      const response = await fetch("/api/upload/purchase-request", {
        method: "POST",
        body: formData,
      });

      clearInterval(progressInterval);
      setUploadProgress(100);

      if (!response.ok) {
        throw new Error("파일 업로드 실패");
      }

      const data = await response.json();
      
      // 업로드된 파일 정보를 상태에 추가
      const newFiles = [...uploadedFiles, ...data.files];
      setUploadedFiles(newFiles);
      
      // form의 attachments 필드 업데이트
      form.setValue("attachments", newFiles);
      
      toast.success(`${files.length}개 파일이 업로드되었습니다`);
    } catch (error) {
      console.error("Upload error:", error);
      toast.error("파일 업로드 중 오류가 발생했습니다");
    } finally {
      setIsUploading(false);
      setUploadProgress(0);
    }
  };

  // 파일 삭제 핸들러
  const handleFileRemove = (fileName: string) => {
    const updatedFiles = uploadedFiles.filter(f => f.fileName !== fileName);
    setUploadedFiles(updatedFiles);
    form.setValue("attachments", updatedFiles);
  };

  // 프로젝트 선택 처리
  const handleProjectSelect = (project: any) => {
    form.setValue("projectId", project.id);
    form.setValue("projectCode", project.projectCode);
    form.setValue("projectName", project.projectName);
    form.setValue("projectCompany", project.projectCompany);
    form.setValue("projectSite", project.projectSite);
    
    // 프로젝트 변경시 패키지 초기화
    setSelectedPackage(null);
    form.setValue("packageNo", "");
    form.setValue("packageName", "");
    form.setValue("smCode", "");
    
    // requestTitle 업데이트
    updateRequestTitle(project.projectName, "", "");
  };

  // 패키지 선택 처리
  const handlePackageSelect = (packageItem: PackageItem) => {
    setSelectedPackage(packageItem);
    form.setValue("packageNo", packageItem.packageCode);
    form.setValue("packageName", packageItem.description);
    
    // SM 코드가 패키지에 있으면 자동 설정
    if (packageItem.smCode) {
      form.setValue("smCode", packageItem.smCode);
    }
    
    // requestTitle 업데이트
    const projectName = form.getValues("projectName");
    const materialDesc = form.getValues("majorItemMaterialDescription");
    updateRequestTitle(projectName, packageItem.description, materialDesc);
  };

  // 자재그룹 선택 처리
  const handleMaterialsChange = (materials: any[]) => {
    setSelectedMaterials(materials);
    if (materials.length > 0) {
      const material = materials[0]; // single select이므로 첫번째 항목만
      form.setValue("majorItemMaterialCategory", material.materialGroupCode);
      form.setValue("majorItemMaterialDescription", material.materialGroupDescription);
      
      // requestTitle 업데이트
      const projectName = form.getValues("projectName");
      const packageName = form.getValues("packageName");
      updateRequestTitle(projectName, packageName, material.materialGroupDescription);
    } else {
      form.setValue("majorItemMaterialCategory", "");
      form.setValue("majorItemMaterialDescription", "");
    }
  };

  // requestTitle 자동 생성
  const updateRequestTitle = (projectName: string, packageName: string, materialDesc: string) => {
    const parts = [];
    if (projectName) parts.push(projectName);
    if (packageName) parts.push(packageName);
    if (materialDesc) parts.push(materialDesc);
    
    if (parts.length > 0) {
      const title = `${parts.join(" - ")} 구매 요청`;
      form.setValue("requestTitle", title);
    }
  };

  const addItem = () => {
    append({
      id: nanoid(),
      itemCode: "",
      itemName: "",
      specification: "",
      quantity: 1,
      unit: "개",
      estimatedUnitPrice: undefined,
      remarks: "",
    });
  };

  const calculateTotal = () => {
    const items = form.watch("items");
    return items?.reduce((sum, item) => {
      const subtotal = (item.quantity || 0) * (item.estimatedUnitPrice || 0);
      return sum + subtotal;
    }, 0) || 0;
  };

  const onSubmit = async (values: FormData) => {
    try {
      setIsLoading(true);
      
      const result = await createPurchaseRequest({
        ...values,
        items: values.items,
        attachments: uploadedFiles, // 첨부파일 포함
      });
      
      if (result.error) {
        toast.error(result.error);
        return;
      }
      
      toast.success("구매 요청이 등록되었습니다");
      handleClose();
      onSuccess?.();
    } catch (error) {
      toast.error("구매 요청 등록에 실패했습니다");
      console.error(error);
    } finally {
      setIsLoading(false);
    }
  };

  const handleClose = () => {
    form.reset({
      requestTitle: "",
      requestDescription: "",
      projectId: undefined,
      projectCode: "",
      projectName: "",
      projectCompany: "",
      projectSite: "",
      classNo: "",
      packageNo: "",
      packageName: "",
      majorItemMaterialCategory: "",
      majorItemMaterialDescription: "",
      smCode: "",
      estimatedBudget: "",
      requestedDeliveryDate: undefined,
      items: [],
      attachments: [],
    });
    setSelectedPackage(null);
    setSelectedMaterials([]);
    setUploadedFiles([]);
    setActiveTab("basic");
    setResetKey((k) => k + 1);
    onOpenChange(false);
  };
  
  return (
    <Dialog open={open} onOpenChange={handleClose}>
      <DialogContent key={resetKey} className="max-w-5xl h-[85vh] overflow-hidden flex flex-col min-h-0">
        <DialogHeader>
          <DialogTitle>새 구매 요청</DialogTitle>
          <DialogDescription>
            구매가 필요한 품목과 관련 정보를 입력해주세요
          </DialogDescription>
        </DialogHeader>

        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="flex-1 overflow-hidden flex flex-col min-h-0">
            <Tabs value={activeTab} onValueChange={setActiveTab} className="flex-1 flex flex-col min-h-0">
              <TabsList className="grid w-full grid-cols-3 flex-shrink-0">
                <TabsTrigger value="basic">
                  <FileText className="mr-2 h-4 w-4" />
                  기본 정보
                </TabsTrigger>
                <TabsTrigger value="items">
                  <Package className="mr-2 h-4 w-4" />
                  품목 정보
                  {fields.length > 0 && (
                    <span className="ml-2 rounded-full bg-primary px-2 py-0.5 text-xs text-primary-foreground">
                      {fields.length}
                    </span>
                  )}
                </TabsTrigger>
                <TabsTrigger value="files">
                  <Paperclip className="mr-2 h-4 w-4" />
                  첨부파일
                  {uploadedFiles.length > 0 && (
                    <span className="ml-2 rounded-full bg-primary px-2 py-0.5 text-xs text-primary-foreground">
                      {uploadedFiles.length}
                    </span>
                  )}
                </TabsTrigger>
              </TabsList>

              <div className="flex-1 overflow-y-auto px-1 min-h-0">
                <TabsContent value="basic" className="space-y-6 mt-6">
                  {/* 프로젝트 선택 */}
                  <Card>
                    <CardHeader>
                      <CardTitle className="text-base">프로젝트 정보 <span className="text-red-500">*</span></CardTitle>
                      <CardDescription>프로젝트, 패키지, 자재그룹을 순서대로 선택하세요</CardDescription>
                    </CardHeader>
                    <CardContent className="space-y-4">
                      {/* 프로젝트 선택 */}
                      <FormField
                        control={form.control}
                        name="projectId"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>프로젝트 <span className="text-red-500">*</span></FormLabel>
                            <ProjectSelector
                              key={`project-${resetKey}`}
                              selectedProjectId={field.value}
                              onProjectSelect={handleProjectSelect}
                              placeholder="프로젝트를 검색하여 선택..."
                            />
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      {/* 패키지 선택 */}
                      <FormField
                        control={form.control}
                        name="packageNo"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>패키지 <span className="text-red-500">*</span></FormLabel>
                            <PackageSelector
                              projectNo={form.watch("projectCode")}
                              selectedPackage={selectedPackage}
                              onPackageSelect={handlePackageSelect}
                              placeholder="패키지 선택..."
                            />
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      {/* 자재그룹 선택 */}
                      <FormField
                        control={form.control}
                        name="majorItemMaterialCategory"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>자재그룹 <span className="text-red-500">*</span></FormLabel>
                            <MaterialGroupSelector
                              selectedMaterials={selectedMaterials}
                              onMaterialsChange={handleMaterialsChange}
                              singleSelect={true}
                              placeholder="자재그룹을 검색하세요..."
                              noValuePlaceHolder="자재그룹을 선택해주세요"
                            />
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      {/* SM 코드 */}
                      <FormField
                        control={form.control}
                        name="smCode"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>SM 코드 <span className="text-red-500">*</span></FormLabel>
                            <FormControl>
                              <Input 
                                placeholder="SM 코드 입력" 
                                {...field} 
                              />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      {/* 선택된 정보 표시 */}
                      {form.watch("projectId") && (
                        <div className="grid grid-cols-2 gap-4 pt-4 border-t">
                          <div>
                            <p className="text-sm text-muted-foreground">프로젝트 코드</p>
                            <p className="font-medium">{form.watch("projectCode") || "-"}</p>
                          </div>
                          <div>
                            <p className="text-sm text-muted-foreground">프로젝트명</p>
                            <p className="font-medium">{form.watch("projectName") || "-"}</p>
                          </div>
                          <div>
                            <p className="text-sm text-muted-foreground">발주처</p>
                            <p className="font-medium">{form.watch("projectCompany") || "-"}</p>
                          </div>
                          <div>
                            <p className="text-sm text-muted-foreground">현장</p>
                            <p className="font-medium">{form.watch("projectSite") || "-"}</p>
                          </div>
                        </div>
                      )}
                    </CardContent>
                  </Card>

                  {/* 기본 정보 */}
                  <div className="space-y-4">
                    <FormField
                      control={form.control}
                      name="requestTitle"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>요청 제목 <span className="text-red-500">*</span></FormLabel>
                          <FormControl>
                            <Input 
                              placeholder="예: 프로젝트 A용 밸브 구매" 
                              {...field} 
                            />
                          </FormControl>
                          <FormDescription>
                            자동 생성된 제목을 수정할 수 있습니다
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <FormField
                      control={form.control}
                      name="requestDescription"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>요청 설명</FormLabel>
                          <FormControl>
                            <Textarea 
                              placeholder="구매 요청에 대한 상세 설명을 입력하세요"
                              className="min-h-[100px]"
                              {...field} 
                            />
                          </FormControl>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                  </div>

                  {/* 예산 및 납기 */}
                  <div className="space-y-4">
                    <h3 className="text-sm font-medium">예산 및 납기</h3>
                    <div className="grid grid-cols-2 gap-4">
                      <FormField
                        control={form.control}
                        name="estimatedBudget"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>예상 예산</FormLabel>
                            <FormControl>
                              <Input placeholder="예: 10,000,000원" {...field} />
                            </FormControl>
                            <FormDescription>
                              전체 구매 예상 예산을 입력하세요
                            </FormDescription>
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name="requestedDeliveryDate"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>희망 납기일</FormLabel>
                            <Popover>
                              <PopoverTrigger asChild>
                                <FormControl>
                                  <Button
                                    variant="outline"
                                    className={cn(
                                      "w-full pl-3 text-left font-normal",
                                      !field.value && "text-muted-foreground"
                                    )}
                                  >
                                    {field.value ? (
                                      format(field.value, "yyyy-MM-dd")
                                    ) : (
                                      <span>날짜 선택</span>
                                    )}
                                    <CalendarIcon className="ml-auto h-4 w-4 opacity-50" />
                                  </Button>
                                </FormControl>
                              </PopoverTrigger>
                              <PopoverContent className="w-auto p-0" align="start">
                                <Calendar
                                  mode="single"
                                  selected={field.value}
                                  onSelect={field.onChange}
                                  disabled={(date) => date < new Date()}
                                />
                              </PopoverContent>
                            </Popover>
                            <FormDescription>
                              자재가 필요한 날짜를 선택하세요
                            </FormDescription>
                          </FormItem>
                        )}
                      />
                    </div>
                  </div>
                </TabsContent>

                <TabsContent value="items" className="space-y-4 mt-6">
                  {/* 품목 목록 */}
                  <div className="flex justify-between items-center">
                    <h3 className="text-sm font-medium">품목 목록</h3>
                    <Button
                      type="button"
                      variant="outline"
                      size="sm"
                      onClick={addItem}
                    >
                      <Plus className="mr-2 h-4 w-4" />
                      품목 추가
                    </Button>
                  </div>

                  {fields.length === 0 ? (
                    <Card>
                      <CardContent className="flex flex-col items-center justify-center py-8">
                        <Package className="h-12 w-12 text-muted-foreground mb-4" />
                        <p className="text-sm text-muted-foreground mb-4">
                          아직 추가된 품목이 없습니다
                        </p>
                        <Button
                          type="button"
                          variant="outline"
                          size="sm"
                          onClick={addItem}
                        >
                          <Plus className="mr-2 h-4 w-4" />
                          첫 품목 추가
                        </Button>
                      </CardContent>
                    </Card>
                  ) : (
                    <div className="border rounded-lg">
                      <Table>
                        <TableHeader>
                          <TableRow>
                            <TableHead className="w-[120px]">아이템 코드</TableHead>
                            <TableHead className="w-[150px]">아이템명 <span className="text-red-500">*</span></TableHead>
                            <TableHead>사양</TableHead>
                            <TableHead className="w-[80px]">수량 <span className="text-red-500">*</span></TableHead>
                            <TableHead className="w-[80px]">단위 <span className="text-red-500">*</span></TableHead>
                            <TableHead className="w-[120px]">예상 단가</TableHead>
                            <TableHead className="w-[120px]">예상 금액</TableHead>
                            <TableHead>비고</TableHead>
                            <TableHead className="w-[50px]"></TableHead>
                          </TableRow>
                        </TableHeader>
                        <TableBody>
                          {fields.map((field, index) => (
                            <TableRow key={field.id}>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.itemCode`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          placeholder="코드" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                      <FormMessage />
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.itemName`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          placeholder="아이템명" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                      <FormMessage />
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.specification`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          placeholder="사양" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.quantity`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          type="number" 
                                          min="1"
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                      <FormMessage />
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.unit`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          placeholder="개" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                      <FormMessage />
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.estimatedUnitPrice`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          type="number" 
                                          min="0"
                                          placeholder="0" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <div className="text-right font-medium">
                                  {new Intl.NumberFormat('ko-KR').format(
                                    (form.watch(`items.${index}.quantity`) || 0) * 
                                    (form.watch(`items.${index}.estimatedUnitPrice`) || 0)
                                  )}
                                </div>
                              </TableCell>
                              <TableCell>
                                <FormField
                                  control={form.control}
                                  name={`items.${index}.remarks`}
                                  render={({ field }) => (
                                    <FormItem>
                                      <FormControl>
                                        <Input 
                                          placeholder="비고" 
                                          {...field} 
                                          className="h-8"
                                        />
                                      </FormControl>
                                    </FormItem>
                                  )}
                                />
                              </TableCell>
                              <TableCell>
                                <Button
                                  type="button"
                                  variant="ghost"
                                  size="icon"
                                  className="h-8 w-8"
                                  onClick={() => remove(index)}
                                  disabled={fields.length === 1}
                                >
                                  <Trash2 className="h-4 w-4" />
                                </Button>
                              </TableCell>
                            </TableRow>
                          ))}
                        </TableBody>
                      </Table>
                      
                      <div className="flex justify-between items-center p-4 border-t bg-muted/30">
                        <div className="text-sm text-muted-foreground">
                          총 {fields.length}개 품목
                        </div>
                        <div className="text-right">
                          <p className="text-sm text-muted-foreground">예상 총액</p>
                          <p className="text-lg font-semibold">
                            {new Intl.NumberFormat('ko-KR', {
                              style: 'currency',
                              currency: 'KRW'
                            }).format(calculateTotal())}
                          </p>
                        </div>
                      </div>
                    </div>
                  )}
                </TabsContent>

                <TabsContent value="files" className="space-y-4 mt-6">
                  {/* 파일 업로드 영역 */}
                  <Card>
                    <CardHeader>
                      <CardTitle className="text-base">첨부파일 업로드 <span className="text-red-500">*</span></CardTitle>
                      <CardDescription>
                        설계 도면, 사양서, 견적서 등 구매 요청 관련 문서를 업로드하세요 (필수)
                      </CardDescription>
                    </CardHeader>
                    <CardContent className="space-y-4">
                      {/* 필수 알림 */}
                      <FormField
                        control={form.control}
                        name="attachments"
                        render={({ field }) => (
                          <FormItem>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      {/* 업로드 진행 상태 */}
                      {isUploading && (
                        <Alert>
                          <AlertCircle className="h-4 w-4" />
                          <AlertDescription className="space-y-2">
                            <p>파일을 업로드 중입니다...</p>
                            <Progress value={uploadProgress} className="w-full" />
                          </AlertDescription>
                        </Alert>
                      )}

                      {/* Dropzone */}
                      <Dropzone
                        onDrop={handleFileUpload}
                        accept={{
                          'application/pdf': ['.pdf'],
                          'application/vnd.ms-excel': ['.xls'],
                          'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet': ['.xlsx'],
                          'application/msword': ['.doc'],
                          'application/vnd.openxmlformats-officedocument.wordprocessingml.document': ['.docx'],
                          'image/*': ['.png', '.jpg', '.jpeg', '.gif'],
                          'application/x-zip-compressed': ['.zip'],
                          'application/x-rar-compressed': ['.rar'],
                        }}
                        maxSize={50 * 1024 * 1024} // 50MB
                        disabled={isUploading}
                      >
                        <DropzoneInput />
                        <DropzoneZone>
                          <DropzoneUploadIcon className="h-12 w-12 text-muted-foreground mb-4" />
                          <DropzoneTitle>
                            파일을 드래그하거나 클릭하여 선택하세요
                          </DropzoneTitle>
                          <DropzoneDescription>
                            PDF, Excel, Word, 이미지 파일 등을 업로드할 수 있습니다 (최대 50MB)
                          </DropzoneDescription>
                        </DropzoneZone>
                      </Dropzone>

                      {/* 업로드된 파일 목록 */}
                      {uploadedFiles.length > 0 && (
                        <div className="space-y-2">
                          <div className="flex items-center justify-between">
                            <h4 className="text-sm font-medium">업로드된 파일</h4>
                            <span className="text-sm text-muted-foreground">
                              총 {uploadedFiles.length}개 파일
                            </span>
                          </div>
                          
                          <FileList>
                            {uploadedFiles.map((file) => (
                              <FileListItem key={file.fileName}>
                                <FileListIcon>
                                  <FileIcon className="h-4 w-4" />
                                </FileListIcon>
                                <FileListInfo>
                                  <FileListHeader>
                                    <FileListName>
                                      {file.originalFileName}
                                    </FileListName>
                                    <FileListSize>
                                      {file.fileSize}
                                    </FileListSize>
                                  </FileListHeader>
                                </FileListInfo>
                                <FileListAction>
                                  <Button
                                    variant="ghost"
                                    size="icon"
                                    className="h-8 w-8"
                                    onClick={() => handleFileRemove(file.fileName)}
                                    disabled={isLoading || isUploading}
                                  >
                                    <X className="h-4 w-4" />
                                  </Button>
                                </FileListAction>
                              </FileListItem>
                            ))}
                          </FileList>
                        </div>
                      )}

                      {/* 파일 업로드 안내 */}
                      <Alert>
                        <AlertCircle className="h-4 w-4" />
                        <AlertDescription>
                          <ul className="list-disc list-inside space-y-1 text-sm">
                            <li className="font-medium">최소 1개 이상의 파일 첨부가 필수입니다</li>
                            <li>최대 파일 크기: 50MB</li>
                            <li>지원 형식: PDF, Excel, Word, 이미지 파일</li>
                            <li>여러 파일을 한 번에 선택하여 업로드할 수 있습니다</li>
                          </ul>
                        </AlertDescription>
                      </Alert>
                    </CardContent>
                  </Card>
                </TabsContent>
              </div>
            </Tabs>

            <DialogFooter className="mt-6">
              <Button
                type="button"
                variant="outline"
                onClick={handleClose}
                disabled={isLoading || isUploading}
              >
                취소
              </Button>
              <Button 
                type="submit" 
                disabled={isLoading || isUploading || !form.formState.isValid}
              >
                {isLoading ? "등록 중..." : "구매요청 등록"}
              </Button>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  );
}