"use client";

import * as React from "react";
import { useState } from "react";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { FolderOpen, Loader2, ChevronRight, ChevronLeft, CheckCircle2 } from "lucide-react";
import { toast } from "sonner";
import { Progress } from "@/components/ui/progress";
import { useTranslation } from "@/i18n/client";
import {
  validateB4FileName,
  B4UploadValidationDialog,
  type FileValidationResult,
} from "./b4-upload-validation-dialog";
import {
  checkB4MappingStatus,
  editDetailDwgReceipt,
  type MappingCheckItem,
  type B4BulkUploadResult,
} from "../actions";
import { v4 as uuidv4 } from "uuid";

interface B4BulkUploadDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  projectNo: string;
  userId: string;
  userName: string;
  userEmail: string;
  vendorCode: string;
  onUploadComplete?: () => void;
  lng: string;
}

type UploadStep = "settings" | "files" | "validation" | "uploading" | "complete";

export function B4BulkUploadDialog({
  open,
  onOpenChange,
  projectNo,
  userId,
  userName,
  userEmail,
  vendorCode,
  onUploadComplete,
  lng,
}: B4BulkUploadDialogProps) {
  const { t } = useTranslation(lng, "dolce");
  const [currentStep, setCurrentStep] = useState<UploadStep>("settings");
  const [drawingUsage, setDrawingUsage] = useState<string>("REC");
  const [registerKind, setRegisterKind] = useState<string>("");
  const [selectedFiles, setSelectedFiles] = useState<File[]>([]);
  const [isUploading, setIsUploading] = useState(false);
  const [validationResults, setValidationResults] = useState<FileValidationResult[]>([]);
  const [showValidationDialog, setShowValidationDialog] = useState(false);
  const [isDragging, setIsDragging] = useState(false);
  const [uploadProgress, setUploadProgress] = useState(0);
  const [uploadResult, setUploadResult] = useState<B4BulkUploadResult | null>(null);

  // B4 GTT 옵션 (코드 번역 유틸리티 사용)
  const drawingUsageOptions = [
    { value: "REC", label: t("bulkUpload.drawingUsageReceive") },
  ];

  const registerKindOptionsMap: Record<string, Array<{ value: string; label: string }>> = {
    REC: [
      { value: "RECP", label: t("bulkUpload.registerKindRecP") },
      { value: "RECW", label: t("bulkUpload.registerKindRecW") },
    ],
  };

  // 다이얼로그 닫을 때 초기화
  React.useEffect(() => {
    if (!open) {
      setCurrentStep("settings");
      setDrawingUsage("REC");
      setRegisterKind("");
      setSelectedFiles([]);
      setValidationResults([]);
      setShowValidationDialog(false);
      setIsDragging(false);
      setUploadProgress(0);
      setUploadResult(null);
    }
  }, [open]);

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

    // 중복 제거
    const existingNames = new Set(selectedFiles.map((f) => f.name));
    const newFiles = files.filter((f) => !existingNames.has(f.name));

    if (newFiles.length === 0) {
      toast.error(t("bulkUpload.duplicateFileError"));
      return;
    }

    setSelectedFiles((prev) => [...prev, ...newFiles]);
    toast.success(t("bulkUpload.filesSelectedSuccess", { count: newFiles.length }));
  };

  // Drag & Drop 핸들러
  const handleDragEnter = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(true);
  };

  const handleDragLeave = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    if (e.currentTarget === e.target) {
      setIsDragging(false);
    }
  };

  const handleDragOver = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    e.dataTransfer.dropEffect = "copy";
  };

  const handleDrop = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(false);

    const droppedFiles = Array.from(e.dataTransfer.files);
    if (droppedFiles.length > 0) {
      handleFilesChange(droppedFiles);
    }
  };

  // 파일 제거
  const handleRemoveFile = (index: number) => {
    setSelectedFiles((prev) => prev.filter((_, i) => i !== index));
  };

  // 1단계 완료 (설정)
  const handleSettingsNext = () => {
    if (!registerKind) {
      toast.error(t("bulkUpload.selectRegisterKindError"));
      return;
    }
    setCurrentStep("files");
  };

  // 2단계 완료 (파일 선택)
  const handleFilesNext = () => {
    if (selectedFiles.length === 0) {
      toast.error(t("bulkUpload.selectFilesError"));
      return;
    }
    setCurrentStep("validation");
    handleValidate();
  };

  // 검증 시작
  const handleValidate = async () => {
    try {
      // 1단계: 파일명 파싱
      const parseResults: FileValidationResult[] = selectedFiles.map((file) => {
        const validation = validateB4FileName(file.name);
        return {
          file,
          valid: validation.valid,
          parsed: validation.parsed,
          error: validation.error,
        };
      });

      // 파싱에 실패한 파일이 있으면 바로 검증 다이얼로그 표시
      const parsedFiles = parseResults.filter((r) => r.valid && r.parsed);
      if (parsedFiles.length === 0) {
        setValidationResults(parseResults);
        setShowValidationDialog(true);
        return;
      }

      // 2단계: 매핑 현황 조회
      const mappingCheckItems: MappingCheckItem[] = parsedFiles.map((r) => ({
        DrawingNo: r.parsed!.drawingNo,
        RevNo: r.parsed!.revNo,
        FileNm: r.file.name,
      }));

      const mappingResults = await checkB4MappingStatus(
        projectNo,
        mappingCheckItems
      );

      // 3단계: 검증 결과 병합
      const finalResults: FileValidationResult[] = parseResults.map((parseResult) => {
        if (!parseResult.valid || !parseResult.parsed) {
          return parseResult;
        }

        // 매핑 결과 찾기
        const mappingResult = mappingResults.find(
          (m) =>
            m.DrawingNo === parseResult.parsed!.drawingNo &&
            m.RevNo === parseResult.parsed!.revNo
        );

        if (!mappingResult) {
          return {
            ...parseResult,
            mappingStatus: "not_found" as const,
            error: t("validation.notFound"),
          };
        }

        // RegisterGroupId가 0이거나 MappingYN이 N이면 도면이 존재하지 않음
        if (mappingResult.RegisterGroupId === 0 || mappingResult.MappingYN === "N") {
          return {
            ...parseResult,
            mappingStatus: "not_found" as const,
            error: t("validation.notRegistered"),
          };
        }

        // DrawingMoveGbn이 "도면입수"가 아니면 업로드 불가
        if (mappingResult.DrawingMoveGbn !== "도면입수") {
          return {
            ...parseResult,
            mappingStatus: "not_found" as const,
            error: t("validation.notGttDeliverables"),
          };
        }

        // MappingYN이 Y이고 도면입수인 경우 업로드 가능
        return {
          ...parseResult,
          mappingStatus: "available" as const,
          drawingName: mappingResult.DrawingName || undefined,
          registerGroupId: mappingResult.RegisterGroupId,
        };
      });

      setValidationResults(finalResults);
      setShowValidationDialog(true);
    } catch (error) {
      console.error("검증 실패:", error);
      toast.error(
        error instanceof Error ? error.message : t("bulkUpload.validationError")
      );
    }
  };

  // 업로드 확인
  const handleConfirmUpload = async (validFiles: FileValidationResult[]) => {
    setIsUploading(true);
    setCurrentStep("uploading");
    setShowValidationDialog(false);

    try {
      console.log(`[B4 일괄 업로드] 시작: ${validFiles.length}개 파일`);

      // 파일을 DrawingNo + RevNo로 그룹화
      const uploadGroups = new Map<
        string,
        Array<{
          file: File;
          drawingNo: string;
          revNo: string;
          fileName: string;
          registerGroupId: number;
        }>
      >();

      validFiles.forEach((fileResult) => {
        const groupKey = `${fileResult.parsed!.drawingNo}_${fileResult.parsed!.revNo}`;
        if (!uploadGroups.has(groupKey)) {
          uploadGroups.set(groupKey, []);
        }
        uploadGroups.get(groupKey)!.push({
          file: fileResult.file,
          drawingNo: fileResult.parsed!.drawingNo,
          revNo: fileResult.parsed!.revNo,
          fileName: fileResult.file.name,
          registerGroupId: fileResult.registerGroupId || 0,
        });
      });

      console.log(`[B4 일괄 업로드] ${uploadGroups.size}개 그룹으로 묶임`);

      let successCount = 0;
      let failCount = 0;
      let completedGroups = 0;

      // 각 그룹별로 순차 처리
      for (const [groupKey, files] of uploadGroups.entries()) {
        const { drawingNo, revNo, registerGroupId } = files[0];

        try {
          console.log(`[B4 업로드] 그룹 ${groupKey}: ${files.length}개 파일`);

          // 1. UploadId 생성
          const uploadId = uuidv4();

          // 2. 파일 업로드 (공통 API 사용)
          const formData = new FormData();
          formData.append("uploadId", uploadId);
          formData.append("userId", userId);
          formData.append("fileCount", String(files.length));

          files.forEach((fileInfo, index) => {
            formData.append(`file_${index}`, fileInfo.file);
          });

          const uploadResponse = await fetch("/api/dolce/upload-files", {
            method: "POST",
            body: formData,
          });

          if (!uploadResponse.ok) {
            throw new Error(`파일 업로드 실패: ${uploadResponse.status}`);
          }

          const uploadResult = await uploadResponse.json();

          if (!uploadResult.success) {
            throw new Error(uploadResult.error || "파일 업로드 실패");
          }

          console.log(`[B4 업로드] 그룹 ${groupKey} 파일 업로드 완료`);

          // 3. 상세도면 등록
          await editDetailDwgReceipt({
            dwgList: [
              {
                Mode: "ADD",
                Status: "Draft",
                RegisterId: 0,
                ProjectNo: projectNo,
                Discipline: "",
                DrawingKind: "B4",
                DrawingNo: drawingNo,
                DrawingName: "",
                RegisterGroupId: registerGroupId,
                RegisterSerialNo: 0,
                RegisterKind: registerKind,
                DrawingRevNo: revNo,
                Category: "TS",
                Receiver: null,
                Manager: "",
                RegisterDesc: "",
                UploadId: uploadId,
                RegCompanyCode: vendorCode,
              },
            ],
            userId,
            userNm: userName,
            vendorCode,
            email: userEmail,
          });

          console.log(`[B4 업로드] 그룹 ${groupKey} 상세도면 등록 완료`);

          successCount += files.length;
        } catch (error) {
          console.error(`[B4 업로드] 그룹 ${groupKey} 실패:`, error);
          failCount += files.length;
        }

        // 진행도 업데이트
        completedGroups++;
        const progress = Math.round((completedGroups / uploadGroups.size) * 100);
        setUploadProgress(progress);
      }

      console.log(`[B4 일괄 업로드] ✅ 완료: 성공 ${successCount}, 실패 ${failCount}`);

      const result: B4BulkUploadResult = {
        success: true,
        successCount,
        failCount,
      };

      setUploadResult(result);
      setCurrentStep("complete");
      toast.success(t("bulkUpload.uploadSuccessToast", { successCount, total: validFiles.length }));
    } catch (error) {
      console.error("[B4 일괄 업로드] 실패:", error);
      toast.error(
        error instanceof Error ? error.message : t("bulkUpload.uploadError")
      );
      setCurrentStep("files");
    } finally {
      setIsUploading(false);
    }
  };

  const registerKindOptions = drawingUsage
    ? registerKindOptionsMap[drawingUsage] || []
    : [];

  const handleDrawingUsageChange = (value: string) => {
    setDrawingUsage(value);
    setRegisterKind("");
  };

  return (
    <>
      <Dialog open={open} onOpenChange={onOpenChange}>
        <DialogContent className="max-w-2xl">
          <DialogHeader>
            <DialogTitle>{t("bulkUpload.title")}</DialogTitle>
            <DialogDescription>
              {currentStep === "settings" && t("bulkUpload.stepSettings")}
              {currentStep === "files" && t("bulkUpload.stepFiles")}
              {currentStep === "validation" && t("bulkUpload.stepValidation")}
            </DialogDescription>
          </DialogHeader>

          <div className="space-y-4">
            {/* 1단계: 설정 입력 */}
            {currentStep === "settings" && (
              <>
                {/* 도면용도 선택 */}
                <div className="space-y-2">
                  <Label>{t("bulkUpload.drawingUsage")} *</Label>
                  <Select value={drawingUsage} onValueChange={handleDrawingUsageChange}>
                    <SelectTrigger>
                      <SelectValue placeholder={t("bulkUpload.drawingUsagePlaceholder")} />
                    </SelectTrigger>
                    <SelectContent>
                      {drawingUsageOptions.map((option) => (
                        <SelectItem key={option.value} value={option.value}>
                          {option.label}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                </div>

                {/* 등록종류 선택 */}
                <div className="space-y-2">
                  <Label>{t("bulkUpload.registerKind")} *</Label>
                  <Select
                    value={registerKind}
                    onValueChange={setRegisterKind}
                    disabled={!drawingUsage}
                  >
                    <SelectTrigger>
                      <SelectValue placeholder={t("bulkUpload.registerKindPlaceholder")} />
                    </SelectTrigger>
                    <SelectContent>
                      {registerKindOptions.map((option) => (
                        <SelectItem key={option.value} value={option.value}>
                          {option.label}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                  <p className="text-sm text-muted-foreground">
                    {t("bulkUpload.registerKindNote")}
                  </p>
                </div>
              </>
            )}

            {/* 2단계: 파일 선택 */}
            {currentStep === "files" && (
              <>
                {/* 파일 선택 영역 */}
                <div
                  className={`border-2 border-dashed rounded-lg p-8 transition-all duration-200 ${
                    isDragging
                      ? "border-primary bg-primary/5 scale-[1.02]"
                      : "border-muted-foreground/30 hover:border-muted-foreground/50"
                  }`}
                  onDragEnter={handleDragEnter}
                  onDragLeave={handleDragLeave}
                  onDragOver={handleDragOver}
                  onDrop={handleDrop}
                >
                  <input
                    type="file"
                    multiple
                    accept=".pdf,.doc,.docx,.xls,.xlsx,.dwg,.dxf,.zip"
                    onChange={(e) => handleFilesChange(Array.from(e.target.files || []))}
                    className="hidden"
                    id="b4-file-upload"
                  />
                  <label
                    htmlFor="b4-file-upload"
                    className="flex flex-col items-center justify-center cursor-pointer"
                  >
                    <FolderOpen
                      className={`h-12 w-12 mb-3 transition-colors ${
                        isDragging ? "text-primary" : "text-muted-foreground"
                      }`}
                    />
                    <p
                      className={`text-sm transition-colors ${
                        isDragging
                          ? "text-primary font-medium"
                          : "text-muted-foreground"
                      }`}
                    >
                      {isDragging
                        ? t("bulkUpload.fileDropHere")
                        : t("bulkUpload.fileSelectArea")}
                    </p>
                    <p className="text-xs text-muted-foreground mt-1">
                      {t("bulkUpload.fileTypes")}
                    </p>
                  </label>
                </div>

                {/* 선택된 파일 목록 */}
                {selectedFiles.length > 0 && (
                  <div className="border rounded-lg p-4">
                    <div className="flex items-center justify-between mb-3">
                      <h4 className="text-sm font-medium">
                        {t("bulkUpload.selectedFiles", { count: selectedFiles.length })}
                      </h4>
                      <Button
                        variant="ghost"
                        size="sm"
                        onClick={() => setSelectedFiles([])}
                      >
                        {t("bulkUpload.removeAll")}
                      </Button>
                    </div>
                    <div className="max-h-60 overflow-y-auto space-y-2">
                      {selectedFiles.map((file, index) => (
                        <div
                          key={index}
                          className="flex items-center justify-between p-2 rounded bg-muted/50"
                        >
                          <div className="flex-1 min-w-0">
                            <p className="text-sm truncate">{file.name}</p>
                            <p className="text-xs text-muted-foreground">
                              {(file.size / 1024 / 1024).toFixed(2)} MB
                            </p>
                          </div>
                          <Button
                            variant="ghost"
                            size="sm"
                            onClick={() => handleRemoveFile(index)}
                          >
                            {t("bulkUpload.removeFile")}
                          </Button>
                        </div>
                      ))}
                    </div>
                  </div>
                )}
              </>
            )}

            {/* 3단계: 검증 중 표시 */}
            {currentStep === "validation" && (
              <div className="flex flex-col items-center justify-center py-12">
                <Loader2 className="h-12 w-12 animate-spin text-primary mb-4" />
                <p className="text-sm text-muted-foreground">
                  {t("bulkUpload.validating")}
                </p>
              </div>
            )}

            {/* 4단계: 업로드 진행 중 */}
            {currentStep === "uploading" && (
              <div className="space-y-6 py-8">
                <div className="flex flex-col items-center">
                  <Loader2 className="h-12 w-12 animate-spin text-primary mb-4" />
                  <h3 className="text-lg font-semibold mb-2">{t("bulkUpload.uploading")}</h3>
                  <p className="text-sm text-muted-foreground">
                    {t("bulkUpload.uploadingWait")}
                  </p>
                </div>
                <div className="space-y-2">
                  <div className="flex justify-between text-sm">
                    <span>{t("bulkUpload.uploadProgress")}</span>
                    <span>{uploadProgress}%</span>
                  </div>
                  <Progress value={uploadProgress} className="h-2" />
                  {/* 90% 이상일 때 추가 안내 메시지 */}
                  {uploadProgress >= 90 && uploadProgress < 100 && (
                    <p className="text-xs text-muted-foreground text-center pt-2">
                      {t("bulkUpload.uploadingToServer")}
                    </p>
                  )}
                </div>
              </div>
            )}

            {/* 5단계: 업로드 완료 */}
            {currentStep === "complete" && uploadResult && (
              <div className="space-y-6 py-8">
                <div className="flex flex-col items-center">
                  <CheckCircle2 className="h-16 w-16 text-green-500 mb-4" />
                  <h3 className="text-lg font-semibold mb-2">{t("bulkUpload.uploadComplete")}</h3>
                  <p className="text-sm text-muted-foreground">
                    {t("bulkUpload.uploadSuccessMessage", { count: uploadResult.successCount })}
                  </p>
                </div>
                
                {uploadResult.failCount && uploadResult.failCount > 0 && (
                  <div className="bg-yellow-50 dark:bg-yellow-950/30 border border-yellow-200 dark:border-yellow-800 rounded-lg p-4">
                    <p className="text-sm text-yellow-800 dark:text-yellow-200">
                      {t("bulkUpload.uploadFailMessage", { count: uploadResult.failCount })}
                    </p>
                  </div>
                )}

                <div className="flex justify-center">
                  <Button
                    onClick={() => {
                      onOpenChange(false);
                      onUploadComplete?.();
                    }}
                  >
                    {t("bulkUpload.confirmButton")}
                  </Button>
                </div>
              </div>
            )}
          </div>

          {/* 푸터 버튼 (uploading, complete 단계에서는 숨김) */}
          {currentStep !== "uploading" && currentStep !== "complete" && currentStep !== "validation" && (
            <DialogFooter>
              {currentStep === "settings" && (
              <>
                <Button
                  variant="outline"
                  onClick={() => onOpenChange(false)}
                >
                  {t("bulkUpload.cancelButton")}
                </Button>
                <Button
                  onClick={handleSettingsNext}
                  disabled={!registerKind}
                >
                  {t("bulkUpload.nextButton")}
                  <ChevronRight className="ml-2 h-4 w-4" />
                </Button>
              </>
            )}

            {currentStep === "files" && (
              <>
                <Button
                  variant="outline"
                  onClick={() => setCurrentStep("settings")}
                >
                  <ChevronLeft className="mr-2 h-4 w-4" />
                  {t("bulkUpload.previousButton")}
                </Button>
                <Button
                  onClick={handleFilesNext}
                  disabled={selectedFiles.length === 0}
                >
                  {t("bulkUpload.validateButton")}
                  <ChevronRight className="ml-2 h-4 w-4" />
                </Button>
              </>
            )}
            </DialogFooter>
          )}
        </DialogContent>
      </Dialog>

      {/* 검증 다이얼로그 */}
      <B4UploadValidationDialog
        open={showValidationDialog}
        onOpenChange={setShowValidationDialog}
        validationResults={validationResults}
        onConfirmUpload={handleConfirmUpload}
        isUploading={isUploading}
        lng={lng}
      />
    </>
  );
}