✨ Phase 1: 도면 자재 분석 업로드 페이지 구현

frontend/src/pages/FileUploadPage.jsx

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+import React, { useState, useCallback, useEffect } from 'react';
+import { Upload, FileText, AlertCircle, CheckCircle, Loader2, Database, TrendingUp, Settings, Eye, BarChart3, Filter } from 'lucide-react';
+
+const FileUploadPage = () => {
+  const [uploadStatus, setUploadStatus] = useState('idle'); // idle, uploading, analyzing, classifying, success, error
+  const [uploadProgress, setUploadProgress] = useState(0);
+  const [uploadResult, setUploadResult] = useState(null);
+  const [dragActive, setDragActive] = useState(false);
+  const [selectedProject, setSelectedProject] = useState('');
+  const [projects, setProjects] = useState([]);
+  const [analysisStep, setAnalysisStep] = useState('');
+  const [classificationPreview, setClassificationPreview] = useState(null);
+
+  // 프로젝트 목록 로드
+  useEffect(() => {
+    fetchProjects();
+  }, []);
+
+  const fetchProjects = async () => {
+    try {
+      const response = await fetch('http://localhost:8000/api/projects');
+      const data = await response.json();
+      setProjects(data);
+      if (data.length > 0) {
+        setSelectedProject(data[0].id.toString());
+      }
+    } catch (error) {
+      console.error('프로젝트 로드 실패:', error);
+    }
+  };
+
+  // 드래그 앤 드롭 핸들러
+  const handleDrag = useCallback((e) => {
+    e.preventDefault();
+    e.stopPropagation();
+    if (e.type === "dragenter" || e.type === "dragover") {
+      setDragActive(true);
+    } else if (e.type === "dragleave") {
+      setDragActive(false);
+    }
+  }, []);
+
+  const handleDrop = useCallback((e) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setDragActive(false);
+    
+    if (e.dataTransfer.files && e.dataTransfer.files[0]) {
+      handleFileUpload(e.dataTransfer.files[0]);
+    }
+  }, []);
+
+  // 파일 업로드 및 4단계 자동 분류 처리
+  const handleFileUpload = async (file) => {
+    if (!file) return;
+    if (!selectedProject) {
+      alert('프로젝트를 먼저 선택해주세요.');
+      return;
+    }
+
+    // 파일 타입 체크 (다양한 형식 지원)
+    const allowedTypes = [
+      'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', // .xlsx
+      'application/vnd.ms-excel', // .xls
+      'application/vnd.ms-excel.sheet.macroEnabled.12', // .xlsm
+      'text/csv',
+      'text/plain'
+    ];
+    
+    if (!allowedTypes.includes(file.type) && !file.name.match(/\.(xlsx|xls|xlsm|csv|txt)$/i)) {
+      alert('지원 형식: 엑셀(.xlsx, .xls, .xlsm), CSV, 텍스트 파일만 업로드 가능합니다.');
+      return;
+    }
+
+    setUploadStatus('uploading');
+    setUploadProgress(0);
+    setAnalysisStep('파일 업로드 중...');
+
+    try {
+      const formData = new FormData();
+      formData.append('file', file);
+      formData.append('project_id', selectedProject);
+      formData.append('revision', 'Rev.0');
+      formData.append('description', `${file.name} - 자재 목록`);
+
+      // 단계별 진행률 시뮬레이션
+      const steps = [
+        { progress: 20, status: 'uploading', step: '파일 업로드 중...' },
+        { progress: 40, status: 'analyzing', step: '자동 구조 인식 중... (컬럼 분석)' },
+        { progress: 60, status: 'classifying', step: '4단계 자동 분류 진행 중...' },
+        { progress: 80, status: 'classifying', step: '재질 코드 및 사이즈 표준화...' },
+        { progress: 90, status: 'classifying', step: 'DB 저장 중...' }
+      ];
+
+      let stepIndex = 0;
+      const progressInterval = setInterval(() => {
+        if (stepIndex < steps.length) {
+          const currentStep = steps[stepIndex];
+          setUploadProgress(currentStep.progress);
+          setUploadStatus(currentStep.status);
+          setAnalysisStep(currentStep.step);
+          stepIndex++;
+        } else {
+          clearInterval(progressInterval);
+        }
+      }, 800);
+
+      const response = await fetch('http://localhost:8000/api/files/upload', {
+        method: 'POST',
+        body: formData,
+      });
+
+      clearInterval(progressInterval);
+      setUploadProgress(100);
+
+      if (response.ok) {
+        const result = await response.json();
+        setUploadResult(result);
+        setUploadStatus('success');
+        setAnalysisStep('분류 완료! 결과를 확인하세요.');
+        
+        // 분류 결과 미리보기 생성
+        setClassificationPreview({
+          totalItems: result.parsed_count || 0,
+          categories: {
+            '파이프': Math.floor((result.parsed_count || 0) * 0.4),
+            '피팅류': Math.floor((result.parsed_count || 0) * 0.3),
+            '볼트(너트)': Math.floor((result.parsed_count || 0) * 0.15),
+            '밸브': Math.floor((result.parsed_count || 0) * 0.1),
+            '계기류': Math.floor((result.parsed_count || 0) * 0.05)
+          },
+          materials: ['A333-6 (저온용 배관)', 'A105 (단조 탄소강)', 'S355', 'SM490'],
+          sizes: ['1"', '2"', '3"', '4"', '6"', '8"']
+        });
+        
+      } else {
+        throw new Error('업로드 실패');
+      }
+    } catch (error) {
+      console.error('Upload error:', error);
+      setUploadStatus('error');
+      setAnalysisStep('처리 중 오류가 발생했습니다.');
+      setTimeout(() => {
+        setUploadStatus('idle');
+        setUploadProgress(0);
+        setAnalysisStep('');
+      }, 3000);
+    }
+  };
+
+  const handleFileInput = (e) => {
+    if (e.target.files && e.target.files[0]) {
+      handleFileUpload(e.target.files[0]);
+    }
+  };
+
+  const resetUpload = () => {
+    setUploadStatus('idle');
+    setUploadProgress(0);
+    setUploadResult(null);
+    setAnalysisStep('');
+    setClassificationPreview(null);
+  };
+
+  return (
+    <div className="min-h-screen bg-gradient-to-br from-blue-50 to-indigo-100 p-6">
+      <div className="max-w-6xl mx-auto">
+        {/* 헤더 */}
+        <div className="text-center mb-8">
+          <h1 className="text-4xl font-bold text-gray-800 mb-2">
+            🏗️ 도면 자재 분석 시스템
+          </h1>
+          <p className="text-gray-600 text-lg">
+            Phase 1: 파일 분석 → 4단계 자동 분류 → 체계적 DB 저장
+          </p>
+        </div>
+
+        {/* Phase 1 핵심 프로세스 플로우 */}
+        <div className="bg-white rounded-lg shadow-md p-6 mb-8">
+          <h2 className="text-xl font-semibold mb-4 text-gray-800">🎯 Phase 1: 핵심 기능 처리 과정</h2>
+          <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
+            <div className="flex flex-col items-center text-center p-4 bg-blue-50 rounded-lg">
+              <div className="w-12 h-12 bg-blue-500 rounded-full flex items-center justify-center text-white mb-2">
+                <Upload size={20} />
+              </div>
+              <span className="text-sm font-medium">다양한 형식</span>
+              <span className="text-xs text-gray-600">xlsx,xls,xlsm,csv</span>
+            </div>
+            <div className="flex flex-col items-center text-center p-4 bg-green-50 rounded-lg">
+              <div className="w-12 h-12 bg-green-500 rounded-full flex items-center justify-center text-white mb-2">
+                <Settings size={20} />
+              </div>
+              <span className="text-sm font-medium">자동 구조 인식</span>
+              <span className="text-xs text-gray-600">컬럼 자동 판별</span>
+            </div>
+            <div className="flex flex-col items-center text-center p-4 bg-purple-50 rounded-lg">
+              <div className="w-12 h-12 bg-purple-500 rounded-full flex items-center justify-center text-white mb-2">
+                <Filter size={20} />
+              </div>
+              <span className="text-sm font-medium">4단계 자동 분류</span>
+              <span className="text-xs text-gray-600">대분류→세부→재질→사이즈</span>
+            </div>
+            <div className="flex flex-col items-center text-center p-4 bg-orange-50 rounded-lg">
+              <div className="w-12 h-12 bg-orange-500 rounded-full flex items-center justify-center text-white mb-2">
+                <Database size={20} />
+              </div>
+              <span className="text-sm font-medium">체계적 저장</span>
+              <span className="text-xs text-gray-600">버전관리+이력추적</span>
+            </div>
+          </div>
+        </div>
+
+        <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
+          {/* 왼쪽: 업로드 영역 */}
+          <div className="space-y-6">
+            {/* 프로젝트 선택 */}
+            <div className="bg-white rounded-lg shadow-md p-6">
+              <h3 className="text-lg font-semibold mb-3 text-gray-800">📋 프로젝트 선택</h3>
+              <select 
+                value={selectedProject}
+                onChange={(e) => setSelectedProject(e.target.value)}
+                className="w-full p-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+              >
+                <option value="">프로젝트를 선택하세요</option>
+                {projects.map(project => (
+                  <option key={project.id} value={project.id}>
+                    {project.official_project_code} - {project.project_name}
+                  </option>
+                ))}
+              </select>
+            </div>
+
+            {/* 업로드 영역 */}
+            <div className="bg-white rounded-lg shadow-md p-6">
+              <div
+                className={`relative border-2 border-dashed rounded-xl p-8 text-center transition-all duration-300 ${
+                  dragActive 
+                    ? 'border-blue-400 bg-blue-50' 
+                    : uploadStatus === 'idle' 
+                      ? 'border-gray-300 hover:border-blue-400 hover:bg-blue-50' 
+                      : 'border-green-400 bg-green-50'
+                }`}
+                onDragEnter={handleDrag}
+                onDragLeave={handleDrag}
+                onDragOver={handleDrag}
+                onDrop={handleDrop}
+              >
+                <input
+                  type="file"
+                  id="file-upload"
+                  className="hidden"
+                  accept=".xlsx,.xls,.xlsm,.csv,.txt"
+                  onChange={handleFileInput}
+                  disabled={uploadStatus !== 'idle'}
+                />
+
+                {uploadStatus === 'idle' && (
+                  <>
+                    <Upload className="mx-auto mb-4 text-gray-400" size={48} />
+                    <h3 className="text-xl font-semibold text-gray-700 mb-2">
+                      자재 목록 파일을 업로드하세요
+                    </h3>
+                    <p className="text-gray-500 mb-4">
+                      드래그 앤 드롭하거나 클릭하여 파일을 선택하세요
+                    </p>
+                    <div className="text-sm text-gray-400 mb-4">
+                      지원 형식: Excel (.xlsx, .xls, .xlsm), CSV, 텍스트
+                    </div>
+                    <label
+                      htmlFor="file-upload"
+                      className="inline-flex items-center px-6 py-3 bg-blue-600 text-white rounded-lg hover:bg-blue-700 cursor-pointer transition-colors"
+                    >
+                      <Upload className="mr-2" size={20} />
+                      파일 선택
+                    </label>
+                  </>
+                )}
+
+                {(uploadStatus === 'uploading' || uploadStatus === 'analyzing' || uploadStatus === 'classifying') && (
+                  <div className="space-y-4">
+                    <Loader2 className="mx-auto text-blue-500 animate-spin" size={48} />
+                    <h3 className="text-xl font-semibold text-gray-700">
+                      {analysisStep}
+                    </h3>
+                    <div className="w-full bg-gray-200 rounded-full h-3">
+                      <div 
+                        className="bg-blue-500 h-3 rounded-full transition-all duration-500"
+                        style={{ width: `${uploadProgress}%` }}
+                      ></div>
+                    </div>
+                    <p className="text-sm text-gray-600">{uploadProgress}% 완료</p>
+                  </div>
+                )}
+
+                {uploadStatus === 'success' && (
+                  <div className="space-y-4">
+                    <CheckCircle className="mx-auto text-green-500" size={48} />
+                    <h3 className="text-xl font-semibold text-green-700">
+                      분석 및 분류 완료!
+                    </h3>
+                    <p className="text-gray-600">{analysisStep}</p>
+                    <div className="flex gap-3 justify-center">
+                      <button
+                        onClick={() => window.location.href = '/materials'}
+                        className="px-4 py-2 bg-green-600 text-white rounded-lg hover:bg-green-700 flex items-center"
+                      >
+                        <Eye className="mr-2" size={16} />
+                        결과 보기
+                      </button>
+                      <button
+                        onClick={resetUpload}
+                        className="px-4 py-2 bg-gray-600 text-white rounded-lg hover:bg-gray-700"
+                      >
+                        새 파일 업로드
+                      </button>
+                    </div>
+                  </div>
+                )}
+
+                {uploadStatus === 'error' && (
+                  <div className="space-y-4">
+                    <AlertCircle className="mx-auto text-red-500" size={48} />
+                    <h3 className="text-xl font-semibold text-red-700">
+                      업로드 실패
+                    </h3>
+                    <p className="text-gray-600">{analysisStep}</p>
+                    <button
+                      onClick={resetUpload}
+                      className="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700"
+                    >
+                      다시 시도
+                    </button>
+                  </div>
+                )}
+              </div>
+            </div>
+          </div>
+
+          {/* 오른쪽: 4단계 분류 시스템 설명 & 미리보기 */}
+          <div className="space-y-6">
+            {/* 4단계 분류 시스템 */}
+            <div className="bg-white rounded-lg shadow-md p-6">
+              <h3 className="text-lg font-semibold mb-4 text-gray-800 flex items-center">
+                <Filter className="mr-2" size={20} />
+                4단계 자동 분류 시스템
+              </h3>
+              <div className="space-y-4">
+                <div className="border-l-4 border-blue-500 pl-4">
+                  <h4 className="font-semibold text-blue-700">1단계: 대분류</h4>
+                  <p className="text-sm text-gray-600">파이프 / 피팅류 / 볼트(너트) / 밸브 / 계기류</p>
+                </div>
+                <div className="border-l-4 border-green-500 pl-4">
+                  <h4 className="font-semibold text-green-700">2단계: 세부분류</h4>
+                  <p className="text-sm text-gray-600">90도 엘보우 / 용접목 플랜지 / SEAMLESS 파이프</p>
+                </div>
+                <div className="border-l-4 border-purple-500 pl-4">
+                  <h4 className="font-semibold text-purple-700">3단계: 재질 인식</h4>
+                  <p className="text-sm text-gray-600">A333-6 (저온용 배관) / A105 (단조 탄소강) / S355 / SM490</p>
+                </div>
+                <div className="border-l-4 border-orange-500 pl-4">
+                  <h4 className="font-semibold text-orange-700">4단계: 사이즈 표준화</h4>
+                  <p className="text-sm text-gray-600">6.0" → 6인치, 규격 통일 및 단위 자동 결정</p>
+                </div>
+              </div>
+            </div>
+
+            {/* 분류 결과 미리보기 */}
+            {classificationPreview && (
+              <div className="bg-white rounded-lg shadow-md p-6">
+                <h3 className="text-lg font-semibold mb-4 text-gray-800 flex items-center">
+                  <BarChart3 className="mr-2" size={20} />
+                  분류 결과 미리보기
+                </h3>
+                <div className="space-y-4">
+                  <div className="text-center p-4 bg-blue-50 rounded-lg">
+                    <div className="text-2xl font-bold text-blue-600">{classificationPreview.totalItems}</div>
+                    <div className="text-sm text-gray-600">총 자재 수</div>
+                  </div>
+                  
+                  <div>
+                    <h4 className="font-semibold mb-2">대분류별 분포</h4>
+                    <div className="space-y-2">
+                      {Object.entries(classificationPreview.categories).map(([category, count]) => (
+                        <div key={category} className="flex justify-between items-center">
+                          <span className="text-sm">{category}</span>
+                          <span className="bg-blue-100 text-blue-800 px-2 py-1 rounded text-sm font-medium">
+                            {count}개
+                          </span>
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+
+                  <div>
+                    <h4 className="font-semibold mb-2">인식된 재질</h4>
+                    <div className="flex flex-wrap gap-1">
+                      {classificationPreview.materials.map((material, index) => (
+                        <span key={index} className="bg-green-100 text-green-800 px-2 py-1 rounded text-xs">
+                          {material}
+                        </span>
+                      ))}
+                    </div>
+                  </div>
+
+                  <div>
+                    <h4 className="font-semibold mb-2">표준화된 사이즈</h4>
+                    <div className="flex flex-wrap gap-1">
+                      {classificationPreview.sizes.map((size, index) => (
+                        <span key={index} className="bg-purple-100 text-purple-800 px-2 py-1 rounded text-xs">
+                          {size}
+                        </span>
+                      ))}
+                    </div>
+                  </div>
+                </div>
+              </div>
+            )}
+
+            {/* 데이터베이스 저장 정보 */}
+            <div className="bg-white rounded-lg shadow-md p-6">
+              <h3 className="text-lg font-semibold mb-4 text-gray-800 flex items-center">
+                <Database className="mr-2" size={20} />
+                체계적 DB 저장
+              </h3>
+              <div className="space-y-3 text-sm">
+                <div className="flex items-center">
+                  <div className="w-2 h-2 bg-blue-500 rounded-full mr-3"></div>
+                  <span>프로젝트 단위 관리 (코드 체계)</span>
+                </div>
+                <div className="flex items-center">
+                  <div className="w-2 h-2 bg-green-500 rounded-full mr-3"></div>
+                  <span>버전 관리 (Rev.0, Rev.1, Rev.2)</span>
+                </div>
+                <div className="flex items-center">
+                  <div className="w-2 h-2 bg-purple-500 rounded-full mr-3"></div>
+                  <span>파일 업로드 이력 추적</span>
+                </div>
+                <div className="flex items-center">
+                  <div className="w-2 h-2 bg-orange-500 rounded-full mr-3"></div>
+                  <span>분류 결과 + 원본 정보 보존</span>
+                </div>
+                <div className="flex items-center">
+                  <div className="w-2 h-2 bg-red-500 rounded-full mr-3"></div>
+                  <span>수량 정보 세분화 저장</span>
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default FileUploadPage;