feat: PMR 라벨 미리보기 기능

- /pmr/api/label/preview: PIL 렌더링 → Base64 이미지
- 미리보기 버튼 + 모달 추가
- 29mm 용지 기준 라벨 이미지 생성

backend/pmr_api.py

@@ -1,10 +1,14 @@
 # pmr_api.py - 조제관리(PMR) Blueprint API
 # PharmaIT3000 MSSQL 연동 (192.168.0.4)
 
-from flask import Blueprint, jsonify, request, render_template
+from flask import Blueprint, jsonify, request, render_template, send_file
 import pyodbc
 from datetime import datetime, date
 import logging
+from PIL import Image, ImageDraw, ImageFont
+import io
+import base64
+import os
 
 pmr_bp = Blueprint('pmr', __name__, url_prefix='/pmr')
 
@@ -319,3 +323,191 @@ def test_connection():
         })
     except Exception as e:
         return jsonify({'success': False, 'error': str(e)}), 500
+
+
+# ─────────────────────────────────────────────────────────────
+# API: 라벨 미리보기
+# ─────────────────────────────────────────────────────────────
+@pmr_bp.route('/api/label/preview', methods=['POST'])
+def preview_label():
+    """
+    라벨 미리보기 (PIL 렌더링 → Base64 이미지)
+    
+    Request Body:
+        - patient_name: 환자명
+        - med_name: 약품명
+        - dosage: 1회 복용량
+        - frequency: 복용 횟수
+        - duration: 복용 일수
+        - unit: 단위 (정, 캡슐, mL 등)
+    """
+    try:
+        data = request.get_json()
+        
+        patient_name = data.get('patient_name', '')
+        med_name = data.get('med_name', '')
+        dosage = float(data.get('dosage', 0))
+        frequency = int(data.get('frequency', 0))
+        duration = int(data.get('duration', 0))
+        unit = data.get('unit', '정')
+        
+        # 라벨 이미지 생성
+        image = create_label_image(
+            patient_name=patient_name,
+            med_name=med_name,
+            dosage=dosage,
+            frequency=frequency,
+            duration=duration,
+            unit=unit
+        )
+        
+        # Base64 인코딩
+        buffer = io.BytesIO()
+        image.save(buffer, format='PNG')
+        buffer.seek(0)
+        img_base64 = base64.b64encode(buffer.getvalue()).decode('utf-8')
+        
+        return jsonify({
+            'success': True,
+            'image': f'data:image/png;base64,{img_base64}'
+        })
+        
+    except Exception as e:
+        logging.error(f"라벨 미리보기 오류: {e}")
+        return jsonify({'success': False, 'error': str(e)}), 500
+
+
+def create_label_image(patient_name, med_name, dosage, frequency, duration, unit='정'):
+    """
+    라벨 이미지 생성 (29mm 용지 기준)
+    """
+    # 라벨 크기 (29mm 용지, 300dpi 기준)
+    label_width = 306
+    label_height = 380
+    
+    image = Image.new("RGB", (label_width, label_height), "white")
+    draw = ImageDraw.Draw(image)
+    
+    # 폰트 설정 (Windows 경로)
+    font_path = "C:/Windows/Fonts/malgunbd.ttf"
+    if not os.path.exists(font_path):
+        font_path = "C:/Windows/Fonts/malgun.ttf"
+    
+    try:
+        name_font = ImageFont.truetype(font_path, 36)
+        drug_font = ImageFont.truetype(font_path, 24)
+        info_font = ImageFont.truetype(font_path, 22)
+        small_font = ImageFont.truetype(font_path, 18)
+    except:
+        name_font = ImageFont.load_default()
+        drug_font = ImageFont.load_default()
+        info_font = ImageFont.load_default()
+        small_font = ImageFont.load_default()
+    
+    # 중앙 정렬 텍스트 함수
+    def draw_centered(text, y, font, fill="black"):
+        bbox = draw.textbbox((0, 0), text, font=font)
+        w = bbox[2] - bbox[0]
+        x = (label_width - w) // 2
+        draw.text((x, y), text, font=font, fill=fill)
+        return y + bbox[3] - bbox[1] + 5
+    
+    # 약품명 줄바꿈 처리
+    def wrap_text(text, font, max_width):
+        lines = []
+        words = text.split()
+        current_line = ""
+        for word in words:
+            test_line = f"{current_line} {word}".strip()
+            bbox = draw.textbbox((0, 0), test_line, font=font)
+            if bbox[2] - bbox[0] <= max_width:
+                current_line = test_line
+            else:
+                if current_line:
+                    lines.append(current_line)
+                current_line = word
+        if current_line:
+            lines.append(current_line)
+        return lines if lines else [text]
+    
+    y = 15
+    
+    # 환자명 (띄어쓰기)
+    spaced_name = " ".join(patient_name) if patient_name else ""
+    y = draw_centered(spaced_name, y, name_font)
+    
+    y += 5
+    
+    # 약품명 (줄바꿈)
+    # 괄호 앞에서 분리
+    if '(' in med_name:
+        main_name = med_name.split('(')[0].strip()
+        sub_info = '(' + med_name.split('(', 1)[1] if '(' in med_name else ''
+    else:
+        main_name = med_name
+        sub_info = ''
+    
+    # 약품명 줄바꿈
+    name_lines = wrap_text(main_name, drug_font, label_width - 30)
+    for line in name_lines:
+        y = draw_centered(line, y, drug_font)
+    
+    # 부가정보
+    if sub_info:
+        y = draw_centered(sub_info, y, small_font, fill="gray")
+    
+    y += 5
+    
+    # 총량 계산
+    if dosage > 0 and frequency > 0 and duration > 0:
+        total = dosage * frequency * duration
+        total_str = str(int(total)) if total == int(total) else f"{total:.1f}"
+        total_text = f"총 {total_str}{unit} / {duration}일분"
+        y = draw_centered(total_text, y, info_font)
+    
+    y += 5
+    
+    # 용법 박스
+    box_margin = 20
+    box_top = y
+    box_bottom = y + 70
+    draw.rectangle(
+        [(box_margin, box_top), (label_width - box_margin, box_bottom)],
+        outline="black",
+        width=2
+    )
+    
+    # 박스 내용
+    dosage_str = str(int(dosage)) if dosage == int(dosage) else f"{dosage:.2f}".rstrip('0').rstrip('.')
+    dosage_text = f"{dosage_str}{unit}"
+    
+    # 복용 시간
+    if frequency == 1:
+        time_text = "아침"
+    elif frequency == 2:
+        time_text = "아침, 저녁"
+    elif frequency == 3:
+        time_text = "아침, 점심, 저녁"
+    else:
+        time_text = f"1일 {frequency}회"
+    
+    box_center_y = (box_top + box_bottom) // 2
+    draw_centered(dosage_text, box_center_y - 20, info_font)
+    draw_centered(time_text, box_center_y + 5, info_font)
+    
+    y = box_bottom + 10
+    
+    # 조제일
+    today = datetime.now().strftime('%Y-%m-%d')
+    y = draw_centered(f"조제일: {today}", y, small_font)
+    
+    # 약국명 (하단)
+    pharmacy_y = label_height - 40
+    draw.rectangle(
+        [(50, pharmacy_y - 5), (label_width - 50, pharmacy_y + 25)],
+        outline="black",
+        width=1
+    )
+    draw_centered("청 춘 약 국", pharmacy_y, info_font)
+    
+    return image

backend/templates/pmr.html

@@ -295,8 +295,21 @@
             </div>
             <div class="action-bar" id="actionBar" style="display:none;">
                 <button class="btn btn-secondary" onclick="selectAll()">전체 선택</button>
+                <button class="btn btn-secondary" onclick="previewLabels()" style="background:#3b82f6;color:#fff;">👁️ 미리보기</button>
                 <button class="btn btn-primary" onclick="printLabels()">🖨️ 라벨 인쇄</button>
             </div>
+            
+            <!-- 미리보기 모달 -->
+            <div id="previewModal" style="display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.7);z-index:1000;overflow-y:auto;">
+                <div style="max-width:400px;margin:50px auto;background:#fff;border-radius:12px;padding:20px;">
+                    <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:15px;">
+                        <h3 style="margin:0;color:#4c1d95;">🏷️ 라벨 미리보기</h3>
+                        <button onclick="closePreview()" style="background:none;border:none;font-size:1.5rem;cursor:pointer;">×</button>
+                    </div>
+                    <div id="previewContent" style="display:flex;flex-direction:column;gap:15px;align-items:center;">
+                    </div>
+                </div>
+            </div>
         </div>
     </div>
 
@@ -466,6 +479,65 @@
             if (checkAll) checkAll.checked = true;
         }
         
+        // 라벨 미리보기
+        async function previewLabels() {
+            const rows = document.querySelectorAll('.med-check:checked');
+            if (rows.length === 0) {
+                alert('미리보기할 약품을 선택하세요');
+                return;
+            }
+            
+            const container = document.getElementById('previewContent');
+            container.innerHTML = '<div class="loading"><div class="spinner"></div></div>';
+            document.getElementById('previewModal').style.display = 'block';
+            
+            // 현재 선택된 환자명
+            const patientName = document.getElementById('detailName').textContent;
+            
+            container.innerHTML = '';
+            
+            for (const checkbox of rows) {
+                const tr = checkbox.closest('tr');
+                const medName = tr.querySelector('.med-name')?.textContent || '';
+                const dosage = parseFloat(tr.cells[3]?.querySelector('.med-dosage')?.textContent) || 0;
+                const frequency = parseInt(tr.cells[4]?.textContent) || 0;
+                const duration = parseInt(tr.cells[5]?.textContent) || 0;
+                
+                try {
+                    const res = await fetch('/pmr/api/label/preview', {
+                        method: 'POST',
+                        headers: {'Content-Type': 'application/json'},
+                        body: JSON.stringify({
+                            patient_name: patientName,
+                            med_name: medName,
+                            dosage: dosage,
+                            frequency: frequency,
+                            duration: duration,
+                            unit: '정'
+                        })
+                    });
+                    const data = await res.json();
+                    
+                    if (data.success) {
+                        const img = document.createElement('img');
+                        img.src = data.image;
+                        img.style.cssText = 'max-width:100%;border:1px solid #ddd;border-radius:8px;';
+                        container.appendChild(img);
+                    }
+                } catch (err) {
+                    console.error('Preview error:', err);
+                }
+            }
+            
+            if (container.children.length === 0) {
+                container.innerHTML = '<p style="color:#999;">미리보기 생성 실패</p>';
+            }
+        }
+        
+        function closePreview() {
+            document.getElementById('previewModal').style.display = 'none';
+        }
+        
         // 라벨 인쇄 (TODO: 구현)
         function printLabels() {
             const selected = Array.from(document.querySelectorAll('.med-check:checked')).map(c => c.dataset.code);