// enhanced-document-sheet.tsx
"use client"

import * as React from "react"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { toast } from "sonner"
import { z } from "zod"
import { useRouter } from "next/navigation"
import { 
  Loader, 
  Save, 
  Upload, 
  Calendar, 
  User, 
  FileText, 
  AlertTriangle,
  CheckCircle,
  Clock,
  Plus,
  X
} from "lucide-react"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"
import {
  Tabs,
  TabsContent,
  TabsList,
  TabsTrigger,
} from "@/components/ui/tabs"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import { Badge } from "@/components/ui/badge"
import { Separator } from "@/components/ui/separator"
import { ScrollArea } from "@/components/ui/scroll-area"
import { Calendar as CalendarComponent } from "@/components/ui/calendar"
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover"
import { cn } from "@/lib/utils"
import { format } from "date-fns"
import { ko } from "date-fns/locale"
import { EnhancedDocumentsView } from "@/db/schema/vendorDocu"

// 드롭존과 파일 관련 컴포넌트들
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 prettyBytes from "pretty-bytes"

// 스키마 정의
const enhancedDocumentSchema = z.object({
  // 기본 문서 정보
  docNumber: z.string().min(1, "문서번호는 필수입니다"),
  title: z.string().min(1, "제목은 필수입니다"),
  pic: z.string().optional(),
  status: z.string().min(1, "상태는 필수입니다"),
  issuedDate: z.date().optional(),
  
  // 스테이지 관리 (plant 타입에서만 수정 가능)
  stages: z.array(z.object({
    id: z.number().optional(),
    stageName: z.string().min(1, "스테이지명은 필수입니다"),
    stageOrder: z.number(),
    priority: z.enum(["HIGH", "MEDIUM", "LOW"]).default("MEDIUM"),
    planDate: z.date().optional(),
    assigneeName: z.string().optional(),
    description: z.string().optional(),
  })).optional(),
  
  // 리비전 업로드 (현재 스테이지에 대한)
  newRevision: z.object({
    stage: z.string().optional(),
    revision: z.string().optional(),
    uploaderType: z.enum(["vendor", "client", "shi"]).default("vendor"),
    uploaderName: z.string().optional(),
    comment: z.string().optional(),
    attachments: z.array(z.instanceof(File)).optional(),
  }).optional(),
})

type EnhancedDocumentSchema = z.infer<typeof enhancedDocumentSchema>

// 상태 옵션 정의
const statusOptions = [
  { value: "ACTIVE", label: "활성" },
  { value: "INACTIVE", label: "비활성" },
  { value: "COMPLETED", label: "완료" },
  { value: "CANCELLED", label: "취소" },
]

const priorityOptions = [
  { value: "HIGH", label: "높음" },
  { value: "MEDIUM", label: "보통" },
  { value: "LOW", label: "낮음" },
]

const stageStatusOptions = [
  { value: "PLANNED", label: "계획됨" },
  { value: "IN_PROGRESS", label: "진행중" },
  { value: "SUBMITTED", label: "제출됨" },
  { value: "APPROVED", label: "승인됨" },
  { value: "REJECTED", label: "반려됨" },
  { value: "COMPLETED", label: "완료됨" },
]

interface EnhancedDocumentSheetProps
  extends React.ComponentPropsWithRef<typeof Sheet> {
  document: EnhancedDocumentsView | null
  projectType: "ship" | "plant"
  mode: "view" | "edit" | "upload" | "schedule" | "approve"
}

export function EnhancedDocumentSheet({ 
  document, 
  projectType, 
  mode = "view",
  ...props 
}: EnhancedDocumentSheetProps) {
  const [isUpdatePending, startUpdateTransition] = React.useTransition()
  const [selectedFiles, setSelectedFiles] = React.useState<File[]>([])
  const [uploadProgress, setUploadProgress] = React.useState(0)
  const [activeTab, setActiveTab] = React.useState("info")
  const router = useRouter()

  // 권한 계산
  const permissions = React.useMemo(() => {
    const canEdit = projectType === "plant" || mode === "edit"
    const canUpload = mode === "upload" || mode === "edit"
    const canApprove = mode === "approve" && projectType === "ship"
    const canSchedule = mode === "schedule" || (projectType === "plant" && mode === "edit")
    
    return { canEdit, canUpload, canApprove, canSchedule }
  }, [projectType, mode])

  const form = useForm<EnhancedDocumentSchema>({
    resolver: zodResolver(enhancedDocumentSchema),
    defaultValues: {
      docNumber: "",
      title: "",
      pic: "",
      status: "ACTIVE",
      issuedDate: undefined,
      stages: [],
      newRevision: {
        stage: "",
        revision: "",
        uploaderType: "vendor",
        uploaderName: "",
        comment: "",
        attachments: [],
      },
    },
  })

  // 폼 초기화
  React.useEffect(() => {
    if (document) {
      form.reset({
        docNumber: document.docNumber,
        title: document.title,
        pic: document.pic || "",
        status: document.status,
        issuedDate: document.issuedDate ? new Date(document.issuedDate) : undefined,
        stages: document.allStages?.map((stage, index) => ({
          id: stage.id,
          stageName: stage.stageName,
          stageOrder: stage.stageOrder || index,
          priority: stage.priority as "HIGH" | "MEDIUM" | "LOW" || "MEDIUM",
          planDate: stage.planDate ? new Date(stage.planDate) : undefined,
          assigneeName: stage.assigneeName || "",
          description: "",
        })) || [],
        newRevision: {
          stage: document.currentStageName || "",
          revision: "",
          uploaderType: "vendor",
          uploaderName: "",
          comment: "",
          attachments: [],
        },
      })
      
      // 모드에 따른 기본 탭 설정
      if (mode === "upload") {
        setActiveTab("upload")
      } else if (mode === "schedule") {
        setActiveTab("schedule")
      } else if (mode === "approve") {
        setActiveTab("approve")
      }
    }
  }, [document, form, mode])

  // 파일 처리
  const handleDropAccepted = (acceptedFiles: File[]) => {
    const newFiles = [...selectedFiles, ...acceptedFiles]
    setSelectedFiles(newFiles)
    form.setValue('newRevision.attachments', newFiles)
  }

  const removeFile = (index: number) => {
    const updatedFiles = [...selectedFiles]
    updatedFiles.splice(index, 1)
    setSelectedFiles(updatedFiles)
    form.setValue('newRevision.attachments', updatedFiles)
  }

  // 스테이지 추가/제거
  const addStage = () => {
    const currentStages = form.getValues("stages") || []
    const newStage = {
      stageName: "",
      stageOrder: currentStages.length,
      priority: "MEDIUM" as const,
      planDate: undefined,
      assigneeName: "",
      description: "",
    }
    form.setValue("stages", [...currentStages, newStage])
  }

  const removeStage = (index: number) => {
    const currentStages = form.getValues("stages") || []
    const updatedStages = currentStages.filter((_, i) => i !== index)
    form.setValue("stages", updatedStages)
  }

  // 제출 처리
  function onSubmit(input: EnhancedDocumentSchema) {
    startUpdateTransition(async () => {
      if (!document) return
      
      try {
        // 모드에 따른 다른 처리
        switch (mode) {
          case "edit":
            // 문서 정보 업데이트 + 스테이지 관리
            await updateDocumentInfo(input)
            break
          case "upload":
            // 리비전 업로드
            await uploadRevision(input)
            break
          case "approve":
            // 승인 처리
            await approveRevision(input)
            break
          case "schedule":
            // 스케줄 관리
            await updateSchedule(input)
            break
        }
        
        form.reset()
        setSelectedFiles([])
        props.onOpenChange?.(false)
        toast.success("성공적으로 처리되었습니다")
        router.refresh()
      } catch (error) {
        toast.error("처리 중 오류가 발생했습니다")
        console.error(error)
      }
    })
  }

  // 개별 처리 함수들
  const updateDocumentInfo = async (input: EnhancedDocumentSchema) => {
    // 문서 기본 정보 업데이트 API 호출
    console.log("문서 정보 업데이트:", input)
  }

  const uploadRevision = async (input: EnhancedDocumentSchema) => {
    if (!input.newRevision?.attachments?.length) {
      throw new Error("파일을 선택해주세요")
    }
    
    // 파일 업로드 처리
    const formData = new FormData()
    formData.append("documentId", String(document?.documentId))
    formData.append("stage", input.newRevision.stage || "")
    formData.append("revision", input.newRevision.revision || "")
    formData.append("uploaderType", input.newRevision.uploaderType)
    
    input.newRevision.attachments.forEach((file) => {
      formData.append("attachments", file)
    })
    
    // API 호출
    console.log("리비전 업로드:", formData)
  }

  const approveRevision = async (input: EnhancedDocumentSchema) => {
    // 승인 처리 API 호출
    console.log("리비전 승인:", input)
  }

  const updateSchedule = async (input: EnhancedDocumentSchema) => {
    // 스케줄 업데이트 API 호출
    console.log("스케줄 업데이트:", input)
  }

  // 제목 및 설명 생성
  const getSheetTitle = () => {
    switch (mode) {
      case "edit": return "문서 정보 수정"
      case "upload": return "리비전 업로드"
      case "approve": return "문서 승인"
      case "schedule": return "일정 관리"
      default: return "문서 상세"
    }
  }

  const getSheetDescription = () => {
    const docInfo = document ? `${document.docNumber} - ${document.title}` : ""
    switch (mode) {
      case "edit": return `문서 정보를 수정합니다. ${docInfo}`
      case "upload": return `새 리비전을 업로드합니다. ${docInfo}`
      case "approve": return `문서를 검토하고 승인 처리합니다. ${docInfo}`
      case "schedule": return `문서의 일정을 관리합니다. ${docInfo}`
      default: return docInfo
    }
  }

  return (
    <Sheet {...props}>
      <SheetContent className="flex flex-col gap-6 sm:max-w-2xl w-full">
        <SheetHeader className="text-left">
          <SheetTitle className="flex items-center gap-2">
            {mode === "upload" && <Upload className="w-5 h-5" />}
            {mode === "approve" && <CheckCircle className="w-5 h-5" />}
            {mode === "schedule" && <Calendar className="w-5 h-5" />}
            {mode === "edit" && <FileText className="w-5 h-5" />}
            {getSheetTitle()}
          </SheetTitle>
          <SheetDescription>
            {getSheetDescription()}
          </SheetDescription>
          
          {/* 프로젝트 타입 및 권한 표시 */}
          <div className="flex items-center gap-2 pt-2">
            <Badge variant={projectType === "ship" ? "default" : "secondary"}>
              {projectType === "ship" ? "조선 프로젝트" : "플랜트 프로젝트"}
            </Badge>
            {document?.isOverdue && (
              <Badge variant="destructive" className="flex items-center gap-1">
                <AlertTriangle className="w-3 h-3" />
                지연
              </Badge>
            )}
            {document?.currentStagePriority === "HIGH" && (
              <Badge variant="destructive">높은 우선순위</Badge>
            )}
          </div>
        </SheetHeader>

        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="flex-1 flex flex-col">
            <Tabs value={activeTab} onValueChange={setActiveTab} className="flex-1 flex flex-col">
              <TabsList className="grid w-full grid-cols-4">
                <TabsTrigger value="info">기본정보</TabsTrigger>
                <TabsTrigger value="schedule" disabled={!permissions.canSchedule}>
                  일정관리
                </TabsTrigger>
                <TabsTrigger value="upload" disabled={!permissions.canUpload}>
                  리비전업로드
                </TabsTrigger>
                <TabsTrigger value="approve" disabled={!permissions.canApprove}>
                  승인처리
                </TabsTrigger>
              </TabsList>

              {/* 기본 정보 탭 */}
              <TabsContent value="info" className="flex-1 space-y-4">
                <ScrollArea className="h-full pr-4">
                  <div className="space-y-4">
                    <FormField
                      control={form.control}
                      name="docNumber"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>문서번호</FormLabel>
                          <FormControl>
                            <Input {...field} disabled={!permissions.canEdit} />
                          </FormControl>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <FormField
                      control={form.control}
                      name="title"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>제목</FormLabel>
                          <FormControl>
                            <Input {...field} disabled={!permissions.canEdit} />
                          </FormControl>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <div className="grid grid-cols-2 gap-4">
                      <FormField
                        control={form.control}
                        name="pic"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>담당자 (PIC)</FormLabel>
                            <FormControl>
                              <Input {...field} disabled={!permissions.canEdit} />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name="status"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>상태</FormLabel>
                            <Select 
                              onValueChange={field.onChange} 
                              value={field.value}
                              disabled={!permissions.canEdit}
                            >
                              <FormControl>
                                <SelectTrigger>
                                  <SelectValue />
                                </SelectTrigger>
                              </FormControl>
                              <SelectContent>
                                {statusOptions.map((option) => (
                                  <SelectItem key={option.value} value={option.value}>
                                    {option.label}
                                  </SelectItem>
                                ))}
                              </SelectContent>
                            </Select>
                            <FormMessage />
                          </FormItem>
                        )}
                      />
                    </div>

                    <FormField
                      control={form.control}
                      name="issuedDate"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>발행일</FormLabel>
                          <Popover>
                            <PopoverTrigger asChild>
                              <FormControl>
                                <Button
                                  variant="outline"
                                  className={cn(
                                    "w-full pl-3 text-left font-normal",
                                    !field.value && "text-muted-foreground"
                                  )}
                                  disabled={!permissions.canEdit}
                                >
                                  {field.value ? (
                                    format(field.value, "yyyy년 MM월 dd일", { locale: ko })
                                  ) : (
                                    <span>날짜를 선택하세요</span>
                                  )}
                                  <Calendar className="ml-auto h-4 w-4 opacity-50" />
                                </Button>
                              </FormControl>
                            </PopoverTrigger>
                            <PopoverContent className="w-auto p-0" align="start">
                              <CalendarComponent
                                mode="single"
                                selected={field.value}
                                onSelect={field.onChange}
                                disabled={(date) => date > new Date()}
                                initialFocus
                              />
                            </PopoverContent>
                          </Popover>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    {/* 현재 상태 정보 표시 */}
                    {document && (
                      <div className="space-y-3 p-4 bg-gray-50 rounded-lg">
                        <h4 className="font-medium flex items-center gap-2">
                          <Clock className="w-4 h-4" />
                          현재 진행 상황
                        </h4>
                        <div className="grid grid-cols-2 gap-4 text-sm">
                          <div>
                            <span className="text-gray-500">현재 스테이지:</span>
                            <p className="font-medium">{document.currentStageName || "-"}</p>
                          </div>
                          <div>
                            <span className="text-gray-500">진행률:</span>
                            <p className="font-medium">{document.progressPercentage || 0}%</p>
                          </div>
                          <div>
                            <span className="text-gray-500">최신 리비전:</span>
                            <p className="font-medium">{document.latestRevision || "-"}</p>
                          </div>
                          <div>
                            <span className="text-gray-500">담당자:</span>
                            <p className="font-medium">{document.currentStageAssigneeName || "-"}</p>
                          </div>
                        </div>
                      </div>
                    )}
                  </div>
                </ScrollArea>
              </TabsContent>

              {/* 일정 관리 탭 */}
              <TabsContent value="schedule" className="flex-1 space-y-4">
                <ScrollArea className="h-full pr-4">
                  <div className="space-y-4">
                    <div className="flex items-center justify-between">
                      <h4 className="font-medium">스테이지 일정 관리</h4>
                      {projectType === "plant" && (
                        <Button
                          type="button"
                          variant="outline"
                          size="sm"
                          onClick={addStage}
                          className="flex items-center gap-1"
                        >
                          <Plus className="w-4 h-4" />
                          스테이지 추가
                        </Button>
                      )}
                    </div>

                    {form.watch("stages")?.map((stage, index) => (
                      <div key={index} className="p-4 border rounded-lg space-y-3">
                        <div className="flex items-center justify-between">
                          <h5 className="font-medium">스테이지 {index + 1}</h5>
                          {projectType === "plant" && (
                            <Button
                              type="button"
                              variant="ghost"
                              size="sm"
                              onClick={() => removeStage(index)}
                            >
                              <X className="w-4 h-4" />
                            </Button>
                          )}
                        </div>

                        <div className="grid grid-cols-2 gap-3">
                          <FormField
                            control={form.control}
                            name={`stages.${index}.stageName`}
                            render={({ field }) => (
                              <FormItem>
                                <FormLabel>스테이지명</FormLabel>
                                <FormControl>
                                  <Input {...field} disabled={projectType === "ship"} />
                                </FormControl>
                                <FormMessage />
                              </FormItem>
                            )}
                          />

                          <FormField
                            control={form.control}
                            name={`stages.${index}.priority`}
                            render={({ field }) => (
                              <FormItem>
                                <FormLabel>우선순위</FormLabel>
                                <Select onValueChange={field.onChange} value={field.value}>
                                  <FormControl>
                                    <SelectTrigger>
                                      <SelectValue />
                                    </SelectTrigger>
                                  </FormControl>
                                  <SelectContent>
                                    {priorityOptions.map((option) => (
                                      <SelectItem key={option.value} value={option.value}>
                                        {option.label}
                                      </SelectItem>
                                    ))}
                                  </SelectContent>
                                </Select>
                                <FormMessage />
                              </FormItem>
                            )}
                          />

                          <FormField
                            control={form.control}
                            name={`stages.${index}.planDate`}
                            render={({ field }) => (
                              <FormItem>
                                <FormLabel>계획일</FormLabel>
                                <Popover>
                                  <PopoverTrigger asChild>
                                    <FormControl>
                                      <Button
                                        variant="outline"
                                        className={cn(
                                          "w-full text-left font-normal",
                                          !field.value && "text-muted-foreground"
                                        )}
                                      >
                                        {field.value ? (
                                          format(field.value, "MM/dd", { locale: ko })
                                        ) : (
                                          <span>날짜 선택</span>
                                        )}
                                        <Calendar className="ml-auto h-4 w-4 opacity-50" />
                                      </Button>
                                    </FormControl>
                                  </PopoverTrigger>
                                  <PopoverContent className="w-auto p-0" align="start">
                                    <CalendarComponent
                                      mode="single"
                                      selected={field.value}
                                      onSelect={field.onChange}
                                      initialFocus
                                    />
                                  </PopoverContent>
                                </Popover>
                                <FormMessage />
                              </FormItem>
                            )}
                          />

                          <FormField
                            control={form.control}
                            name={`stages.${index}.assigneeName`}
                            render={({ field }) => (
                              <FormItem>
                                <FormLabel>담당자</FormLabel>
                                <FormControl>
                                  <Input {...field} />
                                </FormControl>
                                <FormMessage />
                              </FormItem>
                            )}
                          />
                        </div>
                      </div>
                    ))}
                  </div>
                </ScrollArea>
              </TabsContent>

              {/* 리비전 업로드 탭 */}
              <TabsContent value="upload" className="flex-1 space-y-4">
                <ScrollArea className="h-full pr-4">
                  <div className="space-y-4">
                    <div className="grid grid-cols-2 gap-4">
                      <FormField
                        control={form.control}
                        name="newRevision.stage"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>스테이지</FormLabel>
                            <FormControl>
                              <Input {...field} placeholder="예: Issued for Review" />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name="newRevision.revision"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>리비전</FormLabel>
                            <FormControl>
                              <Input {...field} placeholder="예: A, B, 1, 2..." />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />
                    </div>

                    <FormField
                      control={form.control}
                      name="newRevision.uploaderName"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>업로더명 (선택)</FormLabel>
                          <FormControl>
                            <Input {...field} placeholder="업로더 이름을 입력하세요" />
                          </FormControl>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <FormField
                      control={form.control}
                      name="newRevision.comment"
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>코멘트 (선택)</FormLabel>
                          <FormControl>
                            <Textarea {...field} placeholder="코멘트를 입력하세요" rows={3} />
                          </FormControl>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    {/* 파일 업로드 드롭존 */}
                    <FormField
                      control={form.control}
                      name="newRevision.attachments"
                      render={() => (
                        <FormItem>
                          <FormLabel>파일 첨부</FormLabel>
                          <Dropzone
                            maxSize={3e9} // 3GB
                            multiple={true}
                            onDropAccepted={handleDropAccepted}
                            disabled={isUpdatePending}
                          >
                            <DropzoneZone className="flex justify-center">
                              <FormControl>
                                <DropzoneInput />
                              </FormControl>
                              <div className="flex items-center gap-6">
                                <DropzoneUploadIcon />
                                <div className="grid gap-0.5">
                                  <DropzoneTitle>파일을 여기에 드롭하세요</DropzoneTitle>
                                  <DropzoneDescription>
                                    또는 클릭하여 파일을 선택하세요
                                  </DropzoneDescription>
                                </div>
                              </div>
                            </DropzoneZone>
                          </Dropzone>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    {/* 선택된 파일 목록 */}
                    {selectedFiles.length > 0 && (
                      <div className="space-y-2">
                        <div className="flex items-center justify-between">
                          <h6 className="text-sm font-semibold">
                            선택된 파일 ({selectedFiles.length})
                          </h6>
                        </div>
                        <FileList className="max-h-[200px]">
                          {selectedFiles.map((file, index) => (
                            <FileListItem key={index} className="p-3">
                              <FileListHeader>
                                <FileListIcon />
                                <FileListInfo>
                                  <FileListName>{file.name}</FileListName>
                                  <FileListDescription>
                                    {prettyBytes(file.size)}
                                  </FileListDescription>
                                </FileListInfo>
                                <FileListAction 
                                  onClick={() => removeFile(index)} 
                                  disabled={isUpdatePending}
                                >
                                  <X className="h-4 w-4" />
                                </FileListAction>
                              </FileListHeader>
                            </FileListItem>
                          ))}
                        </FileList>
                      </div>
                    )}

                    {/* 업로드 진행 상태 */}
                    {isUpdatePending && uploadProgress > 0 && (
                      <div className="space-y-2">
                        <div className="flex items-center gap-2">
                          <Loader className="h-4 w-4 animate-spin" />
                          <span className="text-sm">{uploadProgress}% 업로드 중...</span>
                        </div>
                        <div className="h-2 w-full bg-muted rounded-full overflow-hidden">
                          <div 
                            className="h-full bg-primary rounded-full transition-all" 
                            style={{ width: `${uploadProgress}%` }} 
                          />
                        </div>
                      </div>
                    )}
                  </div>
                </ScrollArea>
              </TabsContent>

              {/* 승인 처리 탭 */}
              <TabsContent value="approve" className="flex-1 space-y-4">
                <ScrollArea className="h-full pr-4">
                  <div className="space-y-4">
                    <div className="p-4 bg-blue-50 rounded-lg">
                      <h4 className="font-medium mb-2 flex items-center gap-2">
                        <CheckCircle className="w-4 h-4 text-blue-600" />
                        승인 대상 문서
                      </h4>
                      <div className="text-sm space-y-1">
                        <p><span className="font-medium">문서:</span> {document?.docNumber} - {document?.title}</p>
                        <p><span className="font-medium">현재 스테이지:</span> {document?.currentStageName}</p>
                        <p><span className="font-medium">최신 리비전:</span> {document?.latestRevision}</p>
                        <p><span className="font-medium">업로더:</span> {document?.latestRevisionUploaderName}</p>
                      </div>
                    </div>

                    <div className="space-y-3">
                      <div className="flex gap-3">
                        <Button 
                          type="button" 
                          className="flex-1 bg-green-600 hover:bg-green-700"
                          onClick={() => {
                            // 승인 처리 로직
                            console.log("승인 처리")
                          }}
                        >
                          <CheckCircle className="w-4 h-4 mr-2" />
                          승인
                        </Button>
                        <Button 
                          type="button" 
                          variant="destructive" 
                          className="flex-1"
                          onClick={() => {
                            // 반려 처리 로직
                            console.log("반려 처리")
                          }}
                        >
                          <X className="w-4 h-4 mr-2" />
                          반려
                        </Button>
                      </div>

                      <FormField
                        control={form.control}
                        name="newRevision.comment"
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>검토 의견</FormLabel>
                            <FormControl>
                              <Textarea 
                                {...field} 
                                placeholder="승인/반려 사유를 입력하세요" 
                                rows={4} 
                              />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />
                    </div>
                  </div>
                </ScrollArea>
              </TabsContent>
            </Tabs>

            <Separator />

            <SheetFooter className="gap-2 pt-4">
              <SheetClose asChild>
                <Button type="button" variant="outline">
                  취소
                </Button>
              </SheetClose>
              <Button 
                type="submit" 
                disabled={isUpdatePending}
                className={mode === "approve" ? "bg-green-600 hover:bg-green-700" : ""}
              >
                {isUpdatePending && <Loader className="mr-2 size-4 animate-spin" />}
                {mode === "upload" && <Upload className="mr-2 size-4" />}
                {mode === "approve" && <CheckCircle className="mr-2 size-4" />}
                {mode === "schedule" && <Calendar className="mr-2 size-4" />}
                {mode === "edit" && <Save className="mr-2 size-4" />}
                
                {mode === "upload" ? "업로드" :
                 mode === "approve" ? "승인 처리" :
                 mode === "schedule" ? "일정 저장" : "저장"}
              </Button>
            </SheetFooter>
          </form>
        </Form>
      </SheetContent>
    </Sheet>
  )
}