"use client";

import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { Badge } from "@/components/ui/badge";
import { CheckCircle2, XCircle, AlertCircle, Upload } from "lucide-react";

export interface ParsedFileInfo {
  drawingNo: string;
  revNo: string;
  fileName: string;
}

export interface FileValidationResult {
  file: File;
  valid: boolean;
  parsed?: ParsedFileInfo;
  error?: string;
  mappingStatus?: "available" | "not_found";
  drawingName?: string;
  registerGroupId?: number;
}

interface B4UploadValidationDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  validationResults: FileValidationResult[];
  onConfirmUpload: (validFiles: FileValidationResult[]) => void;
  isUploading: boolean;
}

/**
 * B4 파일명 검증 함수
 * 형식: [버림] [DrawingNo] [RevNo].[확장자]
 * 예시: "testfile GTT-DE-007 R01.pdf" → DrawingNo: "GTT-DE-007", RevNo: "R01"
 */
export function validateB4FileName(fileName: string): {
  valid: boolean;
  parsed?: ParsedFileInfo;
  error?: string;
} {
  try {
    // 확장자 분리
    const lastDotIndex = fileName.lastIndexOf(".");
    if (lastDotIndex === -1) {
      return {
        valid: false,
        error: "파일 확장자가 없습니다",
      };
    }

    const extension = fileName.substring(lastDotIndex + 1);
    const nameWithoutExt = fileName.substring(0, lastDotIndex);

    // 공백으로 분리
    const parts = nameWithoutExt.split(" ").filter(p => p.trim() !== "");

    // 최소 3개 파트 필요: [버림], DrawingNo, RevNo
    if (parts.length < 3) {
      return {
        valid: false,
        error: `공백이 최소 2개 있어야 합니다 (현재: ${parts.length - 1}개). 형식: [버림] [DrawingNo] [RevNo].[확장자]`,
      };
    }

    // 첫 번째 토큰은 버림
    const drawingNo = parts[1];
    const revNo = parts[2];

    // 필수 항목이 비어있지 않은지 확인
    if (!drawingNo || drawingNo.trim() === "") {
      return {
        valid: false,
        error: "도면번호(DrawingNo)가 비어있습니다",
      };
    }

    if (!revNo || revNo.trim() === "") {
      return {
        valid: false,
        error: "리비전 번호(RevNo)가 비어있습니다",
      };
    }

    return {
      valid: true,
      parsed: {
        drawingNo: drawingNo.trim(),
        revNo: revNo.trim(),
        fileName: fileName,
      },
    };
  } catch (error) {
    return {
      valid: false,
      error: error instanceof Error ? error.message : "알 수 없는 오류",
    };
  }
}

/**
 * B4 업로드 전 파일 검증 다이얼로그
 */
export function B4UploadValidationDialog({
  open,
  onOpenChange,
  validationResults,
  onConfirmUpload,
  isUploading,
}: B4UploadValidationDialogProps) {
  const validFiles = validationResults.filter((r) => r.valid && r.mappingStatus === "available");
  const notFoundFiles = validationResults.filter((r) => r.valid && r.mappingStatus === "not_found");
  const invalidFiles = validationResults.filter((r) => !r.valid);

  const handleUpload = () => {
    if (validFiles.length > 0) {
      onConfirmUpload(validFiles);
    }
  };

  const handleCancel = () => {
    if (!isUploading) {
      onOpenChange(false);
    }
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-4xl max-h-[85vh] flex flex-col">
        <DialogHeader className="flex-shrink-0">
          <DialogTitle>B4 일괄 업로드 검증</DialogTitle>
          <DialogDescription>
            선택한 파일의 파일명 형식과 매핑 가능 여부를 검증합니다
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4 overflow-auto flex-1 pr-2">
          {/* 요약 통계 */}
          <div className="grid grid-cols-4 gap-3">
            <div className="rounded-lg border p-3">
              <div className="text-sm text-muted-foreground">전체</div>
              <div className="text-2xl font-bold">{validationResults.length}</div>
            </div>
            <div className="rounded-lg border p-3 bg-green-50 dark:bg-green-950/30">
              <div className="text-sm text-green-600 dark:text-green-400">업로드 가능</div>
              <div className="text-2xl font-bold text-green-600 dark:text-green-400">
                {validFiles.length}
              </div>
            </div>
            <div className="rounded-lg border p-3 bg-orange-50 dark:bg-orange-950/30">
              <div className="text-sm text-orange-600 dark:text-orange-400">도면 없음</div>
              <div className="text-2xl font-bold text-orange-600 dark:text-orange-400">
                {notFoundFiles.length}
              </div>
            </div>
            <div className="rounded-lg border p-3 bg-red-50 dark:bg-red-950/30">
              <div className="text-sm text-red-600 dark:text-red-400">형식 오류</div>
              <div className="text-2xl font-bold text-red-600 dark:text-red-400">
                {invalidFiles.length}
              </div>
            </div>
          </div>

          {/* 경고 메시지 */}
          {validFiles.length === 0 && (
            <Alert variant="destructive">
              <XCircle className="h-4 w-4" />
              <AlertDescription>
                업로드 가능한 파일이 없습니다. 파일명 형식을 확인하거나 이미 매핑된 파일은 제외해주세요.
              </AlertDescription>
            </Alert>
          )}

          {(notFoundFiles.length > 0 || invalidFiles.length > 0) && validFiles.length > 0 && (
            <Alert>
              <AlertCircle className="h-4 w-4" />
              <AlertDescription>
                일부 파일에 문제가 있습니다. 업로드 가능한 {validFiles.length}개 파일만 업로드됩니다.
              </AlertDescription>
            </Alert>
          )}

          {/* 파일 목록 */}
          <div className="max-h-[50vh] overflow-auto rounded-md border p-4">
            <div className="space-y-4">
              {/* 업로드 가능 파일 */}
              {validFiles.length > 0 && (
                <div className="space-y-2">
                  <h4 className="text-sm font-semibold text-green-600 dark:text-green-400 flex items-center gap-2">
                    <CheckCircle2 className="h-4 w-4" />
                    업로드 가능 ({validFiles.length}개)
                  </h4>
                  {validFiles.map((result, index) => (
                    <div
                      key={index}
                      className="rounded-lg border border-green-200 dark:border-green-800 bg-green-50 dark:bg-green-950/30 p-3"
                    >
                      <div className="flex items-start justify-between gap-2">
                        <div className="flex-1 min-w-0">
                          <div className="font-mono text-sm break-all">
                            {result.file.name}
                          </div>
                          {result.parsed && (
                            <div className="flex flex-wrap gap-1 mt-2">
                              <Badge variant="outline" className="text-xs">
                                도면: {result.parsed.drawingNo}
                              </Badge>
                              <Badge variant="outline" className="text-xs">
                                Rev: {result.parsed.revNo}
                              </Badge>
                              {result.drawingName && (
                                <Badge variant="outline" className="text-xs">
                                  {result.drawingName}
                                </Badge>
                              )}
                            </div>
                          )}
                        </div>
                        <CheckCircle2 className="h-5 w-5 text-green-600 dark:text-green-400 shrink-0" />
                      </div>
                    </div>
                  ))}
                </div>
              )}

              {/* 도면을 찾을 수 없는 파일 */}
              {notFoundFiles.length > 0 && (
                <div className="space-y-2 mt-4">
                  <h4 className="text-sm font-semibold text-orange-600 dark:text-orange-400 flex items-center gap-2">
                    <XCircle className="h-4 w-4" />
                    도면을 찾을 수 없음 ({notFoundFiles.length}개)
                  </h4>
                  {notFoundFiles.map((result, index) => (
                    <div
                      key={index}
                      className="rounded-lg border border-orange-200 dark:border-orange-800 bg-orange-50 dark:bg-orange-950/30 p-3"
                    >
                      <div className="flex items-start justify-between gap-2">
                        <div className="flex-1 min-w-0">
                          <div className="font-mono text-sm break-all">
                            {result.file.name}
                          </div>
                          <div className="text-xs text-orange-700 dark:text-orange-300 mt-1">
                            ✗ 해당 도면번호가 프로젝트에 등록되어 있지 않습니다
                          </div>
                          {result.parsed && (
                            <div className="flex flex-wrap gap-1 mt-2">
                              <Badge variant="outline" className="text-xs">
                                도면: {result.parsed.drawingNo}
                              </Badge>
                              <Badge variant="outline" className="text-xs">
                                Rev: {result.parsed.revNo}
                              </Badge>
                            </div>
                          )}
                        </div>
                        <XCircle className="h-5 w-5 text-orange-600 dark:text-orange-400 shrink-0" />
                      </div>
                    </div>
                  ))}
                </div>
              )}

              {/* 형식 오류 파일 */}
              {invalidFiles.length > 0 && (
                <div className="space-y-2 mt-4">
                  <h4 className="text-sm font-semibold text-red-600 dark:text-red-400 flex items-center gap-2">
                    <XCircle className="h-4 w-4" />
                    파일명 형식 오류 ({invalidFiles.length}개)
                  </h4>
                  {invalidFiles.map((result, index) => (
                    <div
                      key={index}
                      className="rounded-lg border border-red-200 dark:border-red-800 bg-red-50 dark:bg-red-950/30 p-3"
                    >
                      <div className="flex items-start justify-between gap-2">
                        <div className="flex-1 min-w-0">
                          <div className="font-mono text-sm break-all">
                            {result.file.name}
                          </div>
                          {result.error && (
                            <div className="text-xs text-red-600 dark:text-red-400 mt-1">
                              ✗ {result.error}
                            </div>
                          )}
                        </div>
                        <XCircle className="h-5 w-5 text-red-600 dark:text-red-400 shrink-0" />
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>

          {/* 형식 안내 */}
          <div className="rounded-lg bg-blue-50 dark:bg-blue-950/30 border border-blue-200 dark:border-blue-800 p-3">
            <div className="text-sm font-medium text-blue-900 dark:text-blue-100 mb-1">
              📋 올바른 파일명 형식
            </div>
            <code className="text-xs text-blue-700 dark:text-blue-300">
              [버림] [DrawingNo] [RevNo].[확장자]
            </code>
            <div className="text-xs text-blue-600 dark:text-blue-400 mt-1">
              예: testfile GTT-DE-007 R01.pdf
            </div>
            <div className="text-xs text-blue-600 dark:text-blue-400 mt-1">
              ※ 첫 번째 단어는 무시되며, 공백으로 구분됩니다
            </div>
            <div className="text-xs text-blue-600 dark:text-blue-400 mt-1">
              ※ 네 번째 이상의 단어가 있으면 무시됩니다
            </div>
          </div>
        </div>

        <DialogFooter className="flex-shrink-0">
          <Button
            variant="outline"
            onClick={handleCancel}
            disabled={isUploading}
          >
            취소
          </Button>
          <Button
            onClick={handleUpload}
            disabled={validFiles.length === 0 || isUploading}
          >
            {isUploading ? (
              <>
                <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2" />
                업로드 중...
              </>
            ) : (
              <>
                <Upload className="h-4 w-4 mr-2" />
                업로드 ({validFiles.length}개)
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}