"use client"

import * as React from "react"
import { format } from "date-fns"
import { Download, FileText, Eye, ExternalLink, Loader2 } from "lucide-react"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog"
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table"
import { Button } from "@/components/ui/button"
import { Badge } from "@/components/ui/badge"
import { ScrollArea } from "@/components/ui/scroll-area"
import { Skeleton } from "@/components/ui/skeleton"
import { toast } from "sonner"
import { RfqsLastView } from "@/db/schema"
import { getRfqAttachmentsAction } from "../service"
import { downloadFile, quickPreview, smartFileAction, formatFileSize, getFileInfo } from "@/lib/file-download"
import { decryptWithServerAction } from "@/components/drm/drmUtils"

// 첨부파일 타입
interface RfqAttachment {
  attachmentId: number
  attachmentType: string
  serialNo: string
  description: string | null
  currentRevision: string
  fileName: string
  originalFileName: string
  filePath: string
  fileSize: number | null
  fileType: string | null
  createdByName: string | null
  createdAt: Date | null
  updatedAt: Date | null
  revisionComment?: string | null
}

interface RfqAttachmentsDialogProps {
  isOpen: boolean
  onClose: () => void
  rfqData: RfqsLastView
}

export function RfqAttachmentsDialog({ isOpen, onClose, rfqData }: RfqAttachmentsDialogProps) {
  const [attachments, setAttachments] = React.useState<RfqAttachment[]>([])
  const [isLoading, setIsLoading] = React.useState(false)
  const [downloadingFiles, setDownloadingFiles] = React.useState<Set<number>>(new Set())
  const [isDownloadingAll, setIsDownloadingAll] = React.useState(false);


  const handleDownloadAll = async () => {
    setIsDownloadingAll(true);
    try {

      const rfqId = rfqData.id

      const attachments = await getRfqAttachmentsAction(rfqId);

      if (!attachments.success || attachments.data.length === 0) {
        toast.error(attachments.error || "다운로드할 파일이 없습니다");
      }


      // 2. ZIP 파일 생성 (서버에서)
      const response = await fetch(`/api/rfq/attachments/download-all`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          rfqId,
          files: attachments.data.map(a => ({
            path: a.filePath,
            name: a.originalFileName
          }))
        })
      });

      if (!response.ok) throw new Error('ZIP 생성 실패');

      // 3. ZIP 다운로드
      const blob = await response.blob();
      const url = URL.createObjectURL(blob);
      const link = document.createElement('a');

      // RFQ 코드를 포함한 파일명
      const date = new Date().toISOString().slice(0, 10);
      link.download = `RFQ_${rfqId}_attachments_${date}.zip`;
      link.href = url;

      document.body.appendChild(link);
      link.click();
      document.body.removeChild(link);

    } finally {
      setIsDownloadingAll(false);
    }
  };

  // 첨부파일 목록 로드
  React.useEffect(() => {
    if (!isOpen || !rfqData.id) return

    const loadAttachments = async () => {
      setIsLoading(true)
      try {
        const result = await getRfqAttachmentsAction(rfqData.id)

        if (result.success) {
          setAttachments(result.data)
        } else {
          toast.error(result.error || "첨부파일을 불러오는데 실패했습니다")
          setAttachments([])
        }
      } catch (error) {
        console.error("첨부파일 로드 오류:", error)
        toast.error("첨부파일을 불러오는데 실패했습니다")
        setAttachments([])
      } finally {
        setIsLoading(false)
      }
    }

    loadAttachments()
  }, [isOpen, rfqData.id])

  // 파일 다운로드 핸들러 (DRM 복호화 적용)
  const handleDownload = async (attachment: RfqAttachment) => {
    const attachmentId = attachment.attachmentId
    setDownloadingFiles(prev => new Set([...prev, attachmentId]))

    try {
      // 1. 파일 가져오기
      const fileUrl = attachment.filePath.startsWith('http') 
        ? attachment.filePath 
        : `${window.location.origin}${attachment.filePath}`
      
      toast.loading(`파일 다운로드 준비 중...`, { id: `download-${attachmentId}` })
      
      const response = await fetch(fileUrl)
      if (!response.ok) {
        throw new Error(`파일 다운로드 실패: ${response.status}`)
      }

      // 2. Blob을 File로 변환
      const blob = await response.blob()
      const file = new File([blob], attachment.originalFileName, { type: blob.type })

      // 3. DRM 복호화
      toast.loading(`파일 복호화 중...`, { id: `download-${attachmentId}` })
      const decryptedBuffer = await decryptWithServerAction(file)

      // 4. 복호화된 파일 다운로드
      const decryptedBlob = new Blob([decryptedBuffer], { type: blob.type })
      const downloadUrl = URL.createObjectURL(decryptedBlob)
      
      const link = document.createElement('a')
      link.href = downloadUrl
      link.download = attachment.originalFileName
      link.style.display = 'none'
      
      document.body.appendChild(link)
      link.click()
      document.body.removeChild(link)
      
      // 메모리 정리
      setTimeout(() => URL.revokeObjectURL(downloadUrl), 100)

      toast.success(`파일 다운로드 완료: ${attachment.originalFileName}`, { id: `download-${attachmentId}` })
      console.log(`다운로드 완료: ${attachment.originalFileName} (${formatFileSize(decryptedBlob.size)})`)
    } catch (error) {
      console.error("파일 다운로드 오류:", error)
      const errorMessage = error instanceof Error ? error.message : "파일 다운로드에 실패했습니다"
      toast.error(errorMessage, { id: `download-${attachmentId}` })
    } finally {
      setDownloadingFiles(prev => {
        const newSet = new Set(prev)
        newSet.delete(attachmentId)
        return newSet
      })
    }
  }

  // 파일 미리보기 핸들러
  const handlePreview = async (attachment: RfqAttachment) => {
    const fileInfo = getFileInfo(attachment.originalFileName)

    if (!fileInfo.canPreview) {
      toast.info("이 파일 형식은 미리보기를 지원하지 않습니다. 다운로드를 진행합니다.")
      return handleDownload(attachment)
    }

    try {
      const result = await quickPreview(attachment.filePath, attachment.originalFileName)

      if (!result.success) {
        console.error("미리보기 결과:", result)
      }
    } catch (error) {
      console.error("파일 미리보기 오류:", error)
      toast.error("파일 미리보기에 실패했습니다")
    }
  }


  // 첨부파일 타입별 색상
  const getAttachmentTypeBadgeVariant = (type: string) => {
    switch (type.toLowerCase()) {
      case "견적요청서": return "default"
      case "기술사양서": return "secondary"
      case "도면": return "outline"
      default: return "outline"
    }
  }

  return (
    <Dialog open={isOpen} onOpenChange={onClose}>
      <DialogContent className="max-w-6xl h-[85vh] flex flex-col">
        <DialogHeader>
          <div className="flex items-center justify-between">
            <div>
              <DialogTitle>견적 첨부파일</DialogTitle>
              <DialogDescription>
                {rfqData.rfqCode} - {rfqData.rfqTitle || rfqData.itemName || "견적"}
                {attachments.length > 0 && ` (${attachments.length}개 파일)`}
              </DialogDescription>
            </div>

          </div>
        </DialogHeader>

        <ScrollArea className="flex-1">
          {isLoading ? (
            <div className="space-y-3">
              {[...Array(3)].map((_, i) => (
                <div key={i} className="flex items-center space-x-4 p-3 border rounded-lg">
                  <Skeleton className="h-8 w-8" />
                  <div className="space-y-2 flex-1">
                    <Skeleton className="h-4 w-[300px]" />
                    <Skeleton className="h-3 w-[200px]" />
                  </div>
                  <div className="flex gap-2">
                    <Skeleton className="h-8 w-20" />
                    <Skeleton className="h-8 w-20" />
                  </div>
                </div>
              ))}
            </div>
          ) : (
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead className="w-[120px]">타입</TableHead>
                  <TableHead>파일명</TableHead>
                  {/* <TableHead>설명</TableHead> */}
                  <TableHead className="w-[90px]">리비전</TableHead>
                  <TableHead className="w-[100px]">크기</TableHead>
                  <TableHead className="w-[120px]">생성자</TableHead>
                  <TableHead className="w-[120px]">생성일</TableHead>
                  <TableHead className="w-[140px]">액션</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {attachments.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={8} className="text-center text-muted-foreground py-12">
                      <div className="flex flex-col items-center gap-2">
                        <FileText className="h-8 w-8 text-muted-foreground" />
                        <span>첨부된 파일이 없습니다.</span>
                      </div>
                    </TableCell>
                  </TableRow>
                ) : (
                  attachments.map((attachment) => {
                    const fileInfo = getFileInfo(attachment.originalFileName)
                    const isDownloading = downloadingFiles.has(attachment.attachmentId)

                    return (
                      <TableRow key={attachment.attachmentId}>
                        <TableCell>
                          <Badge
                            variant={getAttachmentTypeBadgeVariant(attachment.attachmentType)}
                            className="text-xs"
                          >
                            {attachment.attachmentType}
                          </Badge>
                        </TableCell>
                        <TableCell>
                          <div className="flex items-center gap-2">
                            <span className="text-lg">{fileInfo.icon}</span>
                            <div className="flex flex-col min-w-0">
                              <span className="text-sm font-medium truncate" title={attachment.originalFileName}>
                                {attachment.originalFileName}
                              </span>
                            </div>
                          </div>
                        </TableCell>
                        {/* <TableCell>
                          <span className="text-sm" title={attachment.description || ""}>
                            {attachment.description || "-"}
                          </span>
                          {attachment.revisionComment && (
                            <div className="text-xs text-muted-foreground mt-1">
                              {attachment.revisionComment}
                            </div>
                          )}
                        </TableCell> */}
                        <TableCell>
                          <Badge variant="secondary" className="font-mono text-xs">
                            {attachment.currentRevision}
                          </Badge>
                        </TableCell>
                        <TableCell className="text-xs text-muted-foreground">
                          {attachment.fileSize ? formatFileSize(attachment.fileSize) : "-"}
                        </TableCell>
                        <TableCell className="text-sm">
                          {attachment.createdByName || "-"}
                        </TableCell>
                        <TableCell className="text-xs text-muted-foreground">
                          {attachment.createdAt ? format(new Date(attachment.createdAt), "MM-dd HH:mm") : "-"}
                        </TableCell>
                        <TableCell>
                          <div className="flex items-center gap-1">
                            {/* 미리보기 버튼 (미리보기 가능한 파일만) */}
                            {fileInfo.canPreview && (
                              <Button
                                variant="ghost"
                                size="sm"
                                onClick={() => handlePreview(attachment)}
                                disabled={isDownloading}
                                title="미리보기"
                              >
                                <Eye className="h-4 w-4" />
                              </Button>
                            )}

                            {/* 다운로드 버튼 */}
                            <Button
                              variant="ghost"
                              size="sm"
                              onClick={() => handleDownload(attachment)}
                              disabled={isDownloading}
                              title="다운로드"
                            >
                              {isDownloading ? (
                                <Loader2 className="h-4 w-4 animate-spin" />
                              ) : (
                                <Download className="h-4 w-4" />
                              )}
                            </Button>

                            {/* 스마트 액션 버튼 (메인 액션) */}
                            {/* <Button
                              variant="outline"
                              size="sm"
                              onClick={() => handleSmartAction(attachment)}
                              disabled={isDownloading}
                              className="ml-1"
                            >
                              {isDownloading ? (
                                <Loader2 className="h-4 w-4 animate-spin mr-1" />
                              ) : fileInfo.canPreview ? (
                                <Eye className="h-4 w-4 mr-1" />
                              ) : (
                                <Download className="h-4 w-4 mr-1" />
                              )}
                              {fileInfo.canPreview ? "보기" : "다운로드"}
                            </Button> */}
                          </div>
                        </TableCell>
                      </TableRow>
                    )
                  })
                )}
              </TableBody>
            </Table>
          )}
        </ScrollArea>
        <div className="flex items-center justify-between border-t pt-4 text-xs text-muted-foreground">
          {/* 하단 정보 */}
          {attachments.length > 0 && !isLoading && (
            <div className="flex justify-between items-center">
              <span>
                총 {attachments.length}개 파일
                {attachments.some(a => a.fileSize) &&
                  ` · 전체 크기: ${formatFileSize(
                    attachments.reduce((sum, a) => sum + (a.fileSize || 0), 0)
                  )}`
                }
              </span>
            </div>
          )}

          {/* 전체 다운로드 버튼 추가 */}
          {/* {attachments.length > 0 && !isLoading && (
            <Button
              onClick={handleDownloadAll}
              disabled={isDownloadingAll}
              variant="outline"
              size="sm"
            >
              {isDownloadingAll ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  다운로드 중...
                </>
              ) : (
                <>
                  <Download className="mr-2 h-4 w-4" />
                  전체 다운로드
                </>
              )}
            </Button>
          )} */}
        </div>
      </DialogContent>
    </Dialog>
  )
}