Merge pull request #5 from Kenearos/claude/fix-latex-form-filling-GbQtu

Add LaTeX template support for form generation

Dockerfile

@@ -0,0 +1,67 @@
+# Multi-stage Dockerfile for AutoForm AI with LaTeX support
+
+# Stage 1: Build Frontend
+FROM node:20-alpine AS frontend-builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source files
+COPY . .
+
+# Build the frontend
+RUN npm run build
+
+# Stage 2: Production image with Python and LaTeX
+FROM python:3.11-slim
+
+# Install TeX Live (minimal installation for form generation)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    texlive-latex-base \
+    texlive-latex-recommended \
+    texlive-latex-extra \
+    texlive-fonts-recommended \
+    texlive-lang-german \
+    texlive-plain-generic \
+    nodejs \
+    npm \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy Python requirements and install
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Install serve for static file serving
+RUN npm install -g serve
+
+# Copy the built frontend
+COPY --from=frontend-builder /app/dist ./dist
+
+# Copy Python backend and LaTeX templates
+COPY latex_service.py ./
+COPY server.py ./
+COPY templates ./templates
+
+# Create startup script
+RUN echo '#!/bin/bash\n\
+python server.py &\n\
+serve dist -l ${PORT:-3000}\n\
+' > /app/start.sh && chmod +x /app/start.sh
+
+# Expose ports
+EXPOSE 3000 5000
+
+# Environment variables
+ENV PORT=3000
+ENV FLASK_DEBUG=false
+ENV VITE_LATEX_API_URL=http://localhost:5000
+
+# Start both services
+CMD ["/app/start.sh"]

components/ReviewPanel.tsx

@@ -1,7 +1,8 @@
-import React, { useState, useEffect, useMemo } from 'react';
+import React, { useState, useEffect, useMemo, useCallback } from 'react';
 import { ExtractedField, FileData } from '../types';
-import { Check, Edit2, Download, RefreshCw, FileText, AlertTriangle, XCircle, ArrowRight, PenTool, CheckCircle2, Circle } from 'lucide-react';
+import { Check, Edit2, Download, RefreshCw, FileText, AlertTriangle, XCircle, ArrowRight, PenTool, CheckCircle2, Circle, FileCode, Loader2 } from 'lucide-react';
 import { createFilledPdf } from '../services/pdfService';
+import { generateLatexPdf, isLatexServiceAvailable, detectTemplate, base64ToBlob } from '../services/latexService';
 import { jsPDF } from "jspdf";
 
 interface ReviewPanelProps {
@@ -13,18 +14,40 @@ interface ReviewPanelProps {
   onReset: () => void;
 }
 
-export const ReviewPanel: React.FC<ReviewPanelProps> = ({ 
+type PdfMode = 'overlay' | 'fillable' | 'latex';
-  fields: initialFields, 
+
-  formFile, 
+export const ReviewPanel: React.FC<ReviewPanelProps> = ({
+  fields: initialFields,
+  formFile,
   sourceFile,
   summary,
   isFillablePdf,
-  onReset 
+  onReset
 }) => {
   const [fields, setFields] = useState(initialFields);
   const [activeField, setActiveField] = useState<number | null>(null);
   const [previewUrl, setPreviewUrl] = useState<string | null>(null);
   const [filterMode, setFilterMode] = useState<'ALL' | 'ATTENTION'>('ALL');
+  const [latexAvailable, setLatexAvailable] = useState<boolean | null>(null);
+  const [pdfMode, setPdfMode] = useState<PdfMode>(isFillablePdf ? 'fillable' : 'overlay');
+  const [isGenerating, setIsGenerating] = useState(false);
+  const [latexPdfBase64, setLatexPdfBase64] = useState<string | null>(null);
+
+  // Detect template from form file name
+  const detectedTemplate = useMemo(() => detectTemplate(formFile.file.name), [formFile.file.name]);
+
+  // Check LaTeX service availability on mount
+  useEffect(() => {
+    const checkLatex = async () => {
+      const available = await isLatexServiceAvailable();
+      setLatexAvailable(available);
+      // Auto-switch to LaTeX mode if available and template detected
+      if (available && detectedTemplate && !isFillablePdf) {
+        setPdfMode('latex');
+      }
+    };
+    checkLatex();
+  }, [detectedTemplate, isFillablePdf]);
 
   // Derived state for progress
   const verifiedCount = fields.filter(f => f.isVerified).length;
@@ -35,12 +58,46 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
     fields.filter(f => f.validation?.status !== 'VALID'), 
   [fields]);
 
+  // Generate LaTeX PDF
+  const generateLatexPreview = useCallback(async () => {
+    if (!detectedTemplate || pdfMode !== 'latex') return;
+
+    setIsGenerating(true);
+    try {
+      const result = await generateLatexPdf(detectedTemplate, fields);
+      if (result.success && result.pdf) {
+        setLatexPdfBase64(result.pdf);
+        const blob = base64ToBlob(result.pdf);
+        const url = URL.createObjectURL(blob);
+        setPreviewUrl(url);
+      } else {
+        console.error('LaTeX generation failed:', result.error);
+        // Fallback to overlay mode
+        setPdfMode('overlay');
+      }
+    } catch (e) {
+      console.error('LaTeX generation error:', e);
+      setPdfMode('overlay');
+    } finally {
+      setIsGenerating(false);
+    }
+  }, [detectedTemplate, fields, pdfMode]);
+
   // Generate preview
   useEffect(() => {
     const updatePreview = async () => {
+      // LaTeX mode - handled separately with button click
+      if (pdfMode === 'latex') {
+        // Only auto-generate if we don't have a preview yet
+        if (!latexPdfBase64) {
+          generateLatexPreview();
+        }
+        return;
+      }
+
       if (formFile.type === 'application/pdf') {
         try {
-          const filledPdfBytes = await createFilledPdf(formFile.base64, fields, isFillablePdf);
+          const filledPdfBytes = await createFilledPdf(formFile.base64, fields, pdfMode === 'fillable');
           const blob = new Blob([filledPdfBytes], { type: 'application/pdf' });
           const url = URL.createObjectURL(blob);
           setPreviewUrl(url);
@@ -52,11 +109,11 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
         setPreviewUrl(formFile.previewUrl);
       }
     };
-    
+
     // Debounce slightly to avoid rapid updates on typing
     const timer = setTimeout(updatePreview, 600);
     return () => clearTimeout(timer);
-  }, [fields, isFillablePdf, formFile.base64, formFile.type]);
+  }, [fields, pdfMode, formFile.base64, formFile.type, latexPdfBase64, generateLatexPreview]);
 
   const handleUpdate = (index: number, newValue: string) => {
     const newFields = [...fields];
@@ -87,6 +144,30 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
   };
 
   const handleDownload = async () => {
+    // LaTeX mode - regenerate fresh PDF for download
+    if (pdfMode === 'latex' && detectedTemplate) {
+      setIsGenerating(true);
+      try {
+        const result = await generateLatexPdf(detectedTemplate, fields);
+        if (result.success && result.pdf) {
+          const blob = base64ToBlob(result.pdf);
+          const url = URL.createObjectURL(blob);
+          const a = document.createElement('a');
+          a.href = url;
+          a.download = `${detectedTemplate}_filled.pdf`;
+          document.body.appendChild(a);
+          a.click();
+          document.body.removeChild(a);
+          URL.revokeObjectURL(url);
+        } else {
+          alert(`PDF generation failed: ${result.error}`);
+        }
+      } finally {
+        setIsGenerating(false);
+      }
+      return;
+    }
+
     if (formFile.type === 'application/pdf' && previewUrl) {
       const a = document.createElement('a');
       a.href = previewUrl;
@@ -106,6 +187,12 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
     }
   };
 
+  // Regenerate LaTeX preview
+  const handleRegenerateLatex = () => {
+    setLatexPdfBase64(null);
+    generateLatexPreview();
+  };
+
   // Sort: Unverified/Issues first, then verified
   const displayedFields = fields.map((f, i) => ({ ...f, originalIndex: i }))
     .sort((a, b) => {
@@ -154,11 +241,16 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
             Start Over
           </button>
           
-          <button 
+          <button
             onClick={handleDownload}
-            className={`flex items-center px-4 py-2 text-sm font-medium text-white rounded-lg transition-colors shadow-sm bg-indigo-600 hover:bg-indigo-700`}
+            disabled={isGenerating}
+            className={`flex items-center px-4 py-2 text-sm font-medium text-white rounded-lg transition-colors shadow-sm ${isGenerating ? 'bg-indigo-400 cursor-wait' : 'bg-indigo-600 hover:bg-indigo-700'}`}
           >
-            <Download className="w-4 h-4 mr-2" />
+            {isGenerating ? (
+              <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+            ) : (
+              <Download className="w-4 h-4 mr-2" />
+            )}
             Download PDF
           </button>
         </div>
@@ -170,29 +262,73 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
           <div className="p-3 bg-slate-800 border-b border-slate-700 flex justify-between items-center">
              <div className="flex items-center space-x-2">
                <span className="text-xs font-medium text-slate-300 uppercase tracking-wider">Preview</span>
-               {!isFillablePdf && (
+               {pdfMode === 'latex' && (
+                 <span className="flex items-center text-[10px] bg-emerald-500/20 text-emerald-300 px-1.5 py-0.5 rounded border border-emerald-500/30">
+                   <FileCode className="w-3 h-3 mr-1" />
+                   LaTeX Template Mode
+                 </span>
+               )}
+               {pdfMode === 'overlay' && (
                  <span className="flex items-center text-[10px] bg-indigo-500/20 text-indigo-300 px-1.5 py-0.5 rounded border border-indigo-500/30">
                    <PenTool className="w-3 h-3 mr-1" />
                    Visual Overlay Mode
                  </span>
                )}
+               {pdfMode === 'fillable' && (
+                 <span className="flex items-center text-[10px] bg-blue-500/20 text-blue-300 px-1.5 py-0.5 rounded border border-blue-500/30">
+                   <FileText className="w-3 h-3 mr-1" />
+                   Fillable PDF Mode
+                 </span>
+               )}
+             </div>
+             <div className="flex items-center space-x-2">
+               {/* Mode Switcher */}
+               {latexAvailable && detectedTemplate && (
+                 <button
+                   onClick={() => {
+                     const newMode = pdfMode === 'latex' ? 'overlay' : 'latex';
+                     setPdfMode(newMode);
+                     if (newMode === 'latex') {
+                       setLatexPdfBase64(null);
+                     }
+                   }}
+                   className="text-[10px] bg-slate-700 hover:bg-slate-600 text-slate-300 px-2 py-1 rounded transition-colors"
+                 >
+                   {pdfMode === 'latex' ? 'Use Overlay' : 'Use LaTeX'}
+                 </button>
+               )}
+               {pdfMode === 'latex' && (
+                 <button
+                   onClick={handleRegenerateLatex}
+                   disabled={isGenerating}
+                   className="text-[10px] bg-emerald-700 hover:bg-emerald-600 text-emerald-100 px-2 py-1 rounded transition-colors disabled:opacity-50"
+                 >
+                   {isGenerating ? 'Generating...' : 'Regenerate'}
+                 </button>
+               )}
+               <span className="text-xs text-slate-400">{formFile.file.name}</span>
              </div>
-             <span className="text-xs text-slate-400">{formFile.file.name}</span>
           </div>
           <div className="flex-1 bg-slate-900 relative">
-             {previewUrl ? (
+             {isGenerating && pdfMode === 'latex' ? (
-                formFile.type === 'application/pdf' ? (
+                <div className="flex flex-col items-center justify-center h-full text-emerald-400">
-                  <iframe 
+                  <Loader2 className="w-16 h-16 mb-4 animate-spin" />
-                    src={previewUrl} 
+                  <p className="font-medium">Generating LaTeX PDF...</p>
+                  <p className="text-sm text-slate-500 mt-1">Compiling template with your data</p>
+                </div>
+             ) : previewUrl ? (
+                formFile.type === 'application/pdf' || pdfMode === 'latex' ? (
+                  <iframe
+                    src={previewUrl}
                     title="Form PDF Preview"
                     className="w-full h-full border-none"
                   />
                 ) : (
                   <div className="w-full h-full overflow-auto flex items-center justify-center p-4">
-                    <img 
+                    <img
-                      src={previewUrl} 
+                      src={previewUrl}
-                      alt="Form Document" 
+                      alt="Form Document"
-                      className="max-w-full shadow-lg border border-slate-700" 
+                      className="max-w-full shadow-lg border border-slate-700"
                     />
                   </div>
                 )
@@ -230,12 +366,24 @@ export const ReviewPanel: React.FC<ReviewPanelProps> = ({
               </div>
             </div>
             
-             {!isFillablePdf && (
+             {pdfMode === 'latex' && detectedTemplate && (
+                <div className="flex items-start space-x-2 bg-emerald-50 text-emerald-800 p-3 rounded-md border border-emerald-100 text-xs">
+                   <FileCode className="w-4 h-4 flex-shrink-0 text-emerald-600 mt-0.5" />
+                   <div>
+                     <p className="font-semibold">LaTeX Template Mode: {detectedTemplate}</p>
+                     <p>Using precise LaTeX template. All fields will be positioned correctly in the generated PDF.</p>
+                   </div>
+                </div>
+             )}
+             {pdfMode === 'overlay' && (
                 <div className="flex items-start space-x-2 bg-indigo-50 text-indigo-800 p-3 rounded-md border border-indigo-100 text-xs">
                    <PenTool className="w-4 h-4 flex-shrink-0 text-indigo-600 mt-0.5" />
                    <div>
                      <p className="font-semibold">Visual Overlay Mode</p>
                      <p>AI is visually estimating field positions. Please verify text alignment in the preview.</p>
+                     {latexAvailable && detectedTemplate && (
+                       <p className="mt-1 text-emerald-700 font-medium">Tip: LaTeX template available! Click "Use LaTeX" for better results.</p>
+                     )}
                    </div>
                 </div>
              )}

latex_service.py

@@ -0,0 +1,249 @@
+#!/usr/bin/env python3
+"""
+LaTeX Form Generation Service
+
+This service generates filled PDF forms using LaTeX templates.
+It takes extracted field data and compiles a LaTeX template into a PDF.
+"""
+
+import json
+import os
+import subprocess
+import tempfile
+import base64
+import sys
+import shutil
+from pathlib import Path
+from typing import Dict, Any, Optional
+
+# Template directory
+TEMPLATE_DIR = Path(__file__).parent / "templates"
+
+
+def escape_latex(text: str) -> str:
+    """Escape special LaTeX characters in text."""
+    if not text:
+        return ""
+
+    # LaTeX special characters that need escaping
+    replacements = [
+        ('\\', r'\textbackslash{}'),
+        ('&', r'\&'),
+        ('%', r'\%'),
+        ('$', r'\$'),
+        ('#', r'\#'),
+        ('_', r'\_'),
+        ('{', r'\{'),
+        ('}', r'\}'),
+        ('~', r'\textasciitilde{}'),
+        ('^', r'\textasciicircum{}'),
+    ]
+
+    result = text
+    for old, new in replacements:
+        result = result.replace(old, new)
+
+    return result
+
+
+def checkbox(value: str) -> str:
+    """Return LaTeX checkbox symbol based on value."""
+    if not value:
+        return r'$\square$'
+
+    val_lower = value.lower().strip()
+    if val_lower in ('true', 'yes', 'ja', 'x', '1', 'checked'):
+        return r'$\boxtimes$'
+    return r'$\square$'
+
+
+def format_date(date_str: str) -> str:
+    """Ensure date is in DD.MM.YYYY format."""
+    if not date_str:
+        return ""
+
+    # Already in correct format
+    if len(date_str) == 10 and date_str[2] == '.' and date_str[5] == '.':
+        return escape_latex(date_str)
+
+    # Try to parse ISO format
+    try:
+        from datetime import datetime
+        for fmt in ['%Y-%m-%d', '%d/%m/%Y', '%m/%d/%Y']:
+            try:
+                dt = datetime.strptime(date_str, fmt)
+                return dt.strftime('%d.%m.%Y')
+            except ValueError:
+                continue
+    except:
+        pass
+
+    return escape_latex(date_str)
+
+
+def load_template(template_name: str) -> str:
+    """Load a LaTeX template file."""
+    template_path = TEMPLATE_DIR / f"{template_name}.tex"
+
+    if not template_path.exists():
+        raise FileNotFoundError(f"Template not found: {template_path}")
+
+    return template_path.read_text(encoding='utf-8')
+
+
+def fill_template(template: str, fields: Dict[str, Any]) -> str:
+    """
+    Fill a LaTeX template with field values.
+
+    Fields can be accessed in template as:
+    - {{field_name}} for escaped text values
+    - {{field_name|raw}} for raw values (no escaping)
+    - {{field_name|checkbox}} for checkbox symbols
+    - {{field_name|date}} for date formatting
+    """
+    result = template
+
+    # Process each field
+    for key, value in fields.items():
+        value_str = str(value) if value is not None else ""
+
+        # Replace with different formatters
+        # Raw (no escaping)
+        result = result.replace(f'{{{{{key}|raw}}}}', value_str)
+        # Checkbox
+        result = result.replace(f'{{{{{key}|checkbox}}}}', checkbox(value_str))
+        # Date
+        result = result.replace(f'{{{{{key}|date}}}}', format_date(value_str))
+        # Default (escaped)
+        result = result.replace(f'{{{{{key}}}}}', escape_latex(value_str))
+
+    # Clean up any remaining placeholders (unfilled fields)
+    import re
+    result = re.sub(r'\{\{[^}]+\}\}', '', result)
+
+    return result
+
+
+def compile_latex(latex_content: str, output_format: str = 'pdf') -> bytes:
+    """
+    Compile LaTeX content to PDF.
+
+    Returns the PDF as bytes.
+    """
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tex_file = Path(tmpdir) / "document.tex"
+        tex_file.write_text(latex_content, encoding='utf-8')
+
+        # Copy any additional files (images, etc.) if needed
+        # For now, we just compile the main document
+
+        # Run pdflatex twice (for references)
+        for _ in range(2):
+            result = subprocess.run(
+                ['pdflatex', '-interaction=nonstopmode', '-output-directory', tmpdir, str(tex_file)],
+                capture_output=True,
+                text=True,
+                timeout=60
+            )
+
+            if result.returncode != 0:
+                # Check for common errors
+                error_log = Path(tmpdir) / "document.log"
+                if error_log.exists():
+                    log_content = error_log.read_text(encoding='utf-8', errors='ignore')
+                    # Extract error lines
+                    errors = [line for line in log_content.split('\n') if line.startswith('!')]
+                    if errors:
+                        raise RuntimeError(f"LaTeX compilation failed: {'; '.join(errors[:3])}")
+                raise RuntimeError(f"LaTeX compilation failed: {result.stderr[:500]}")
+
+        pdf_file = Path(tmpdir) / "document.pdf"
+        if not pdf_file.exists():
+            raise RuntimeError("PDF file was not created")
+
+        return pdf_file.read_bytes()
+
+
+def generate_form(template_name: str, fields: Dict[str, Any]) -> bytes:
+    """
+    Generate a filled PDF form from a template and field data.
+
+    Args:
+        template_name: Name of the template (without .tex extension)
+        fields: Dictionary of field names to values
+
+    Returns:
+        PDF content as bytes
+    """
+    template = load_template(template_name)
+    filled = fill_template(template, fields)
+    return compile_latex(filled)
+
+
+def list_templates() -> list:
+    """List available templates."""
+    if not TEMPLATE_DIR.exists():
+        return []
+
+    return [f.stem for f in TEMPLATE_DIR.glob("*.tex")]
+
+
+# CLI Interface
+if __name__ == "__main__":
+    import argparse
+
+    parser = argparse.ArgumentParser(description='LaTeX Form Generation Service')
+    parser.add_argument('command', choices=['generate', 'list', 'preview'],
+                       help='Command to execute')
+    parser.add_argument('--template', '-t', help='Template name')
+    parser.add_argument('--fields', '-f', help='JSON string or file path with field data')
+    parser.add_argument('--output', '-o', help='Output file path')
+
+    args = parser.parse_args()
+
+    if args.command == 'list':
+        templates = list_templates()
+        print(json.dumps(templates))
+
+    elif args.command == 'preview':
+        # Output the filled LaTeX source (for debugging)
+        if not args.template or not args.fields:
+            print("Error: --template and --fields required", file=sys.stderr)
+            sys.exit(1)
+
+        if args.fields.startswith('{'):
+            fields = json.loads(args.fields)
+        else:
+            with open(args.fields, 'r') as f:
+                fields = json.load(f)
+
+        template = load_template(args.template)
+        filled = fill_template(template, fields)
+        print(filled)
+
+    elif args.command == 'generate':
+        if not args.template or not args.fields:
+            print("Error: --template and --fields required", file=sys.stderr)
+            sys.exit(1)
+
+        # Parse fields
+        if args.fields.startswith('{'):
+            fields = json.loads(args.fields)
+        else:
+            with open(args.fields, 'r') as f:
+                fields = json.load(f)
+
+        try:
+            pdf_bytes = generate_form(args.template, fields)
+
+            if args.output:
+                with open(args.output, 'wb') as f:
+                    f.write(pdf_bytes)
+                print(f"PDF written to {args.output}", file=sys.stderr)
+            else:
+                # Output base64 encoded PDF to stdout
+                print(base64.b64encode(pdf_bytes).decode('ascii'))
+
+        except Exception as e:
+            print(f"Error: {e}", file=sys.stderr)
+            sys.exit(1)

package.json

@@ -11,7 +11,9 @@
     "test": "vitest",
     "test:ui": "vitest --ui",
     "test:coverage": "vitest --coverage",
-    "test:run": "vitest run"
+    "test:run": "vitest run",
+    "latex:server": "python3 server.py",
+    "dev:all": "concurrently \"npm run dev\" \"npm run latex:server\""
   },
   "dependencies": {
     "react-dom": "^19.2.4",

railway.toml

@@ -1,9 +1,9 @@
 [build]
-builder = "nixpacks"
+builder = "dockerfile"
+dockerfilePath = "Dockerfile"
 
 [deploy]
-startCommand = "npm start"
 healthcheckPath = "/"
-healthcheckTimeout = 100
+healthcheckTimeout = 300
 restartPolicyType = "on_failure"
 restartPolicyMaxRetries = 3

requirements.txt

@@ -1 +1,3 @@
 pypdf>=4.0.0
+flask>=3.0.0
+flask-cors>=4.0.0

server.py

@@ -0,0 +1,337 @@
+#!/usr/bin/env python3
+"""
+Flask server for LaTeX form generation.
+Provides API endpoints for compiling LaTeX templates with field data.
+"""
+
+from flask import Flask, request, jsonify, send_file
+from flask_cors import CORS
+import base64
+import io
+import json
+import os
+import sys
+from pathlib import Path
+
+# Add parent directory to path for imports
+sys.path.insert(0, str(Path(__file__).parent))
+
+from latex_service import generate_form, list_templates, load_template, fill_template, escape_latex
+
+app = Flask(__name__)
+CORS(app)  # Enable CORS for frontend access
+
+# Field mapping for G2210-11 template
+# Maps extracted field labels to LaTeX template variables
+G2210_FIELD_MAPPING = {
+    # Patient data
+    "versicherungsnummer": ["versicherungsnummer", "vers.nr.", "vers-nr", "rentenversicherungsnummer", "rvnr"],
+    "abt_nr": ["abt.-nr.", "abt-nr", "abteilungsnummer", "aktenzeichen"],
+    "name_vorname": ["name, vorname", "name vorname", "patient", "patientenname", "name des versicherten"],
+    "geburtsdatum": ["geburtsdatum", "geb.", "geb.datum", "geboren am", "geburtstag"],
+    "geschlecht": ["geschlecht", "sex", "m/w/d"],
+    "strasse": ["straße", "strasse", "anschrift", "adresse"],
+    "plz": ["plz", "postleitzahl"],
+    "ort": ["ort", "wohnort", "stadt"],
+    "telefon": ["telefon", "tel.", "tel", "telefonnummer", "rufnummer"],
+    "krankenkasse": ["krankenkasse", "krankenversicherung", "kk", "versicherung"],
+
+    # Employment
+    "beruf_taetigkeit": ["beruf", "tätigkeit", "derzeitige tätigkeit", "beschäftigung", "arbeit"],
+    "arbeitgeber": ["arbeitgeber", "firma", "unternehmen"],
+    "au_seit": ["arbeitsunfähig seit", "au seit", "arbeitsunfähigkeit seit", "krankgeschrieben seit"],
+    "letzte_arbeit": ["letzte arbeitsaufnahme", "letzter arbeitstag", "zuletzt gearbeitet"],
+
+    # Diagnoses
+    "diagnose_1": ["diagnose 1", "hauptdiagnose", "1. diagnose"],
+    "diagnose_1_icd": ["icd 1", "icd-10 1", "diagnose 1 icd"],
+    "diagnose_2": ["diagnose 2", "nebendiagnose 1", "2. diagnose"],
+    "diagnose_2_icd": ["icd 2", "icd-10 2", "diagnose 2 icd"],
+    "diagnose_3": ["diagnose 3", "nebendiagnose 2", "3. diagnose"],
+    "diagnose_3_icd": ["icd 3", "icd-10 3", "diagnose 3 icd"],
+    "diagnose_4": ["diagnose 4", "nebendiagnose 3", "4. diagnose"],
+    "diagnose_4_icd": ["icd 4", "icd-10 4", "diagnose 4 icd"],
+    "diagnose_5": ["diagnose 5", "nebendiagnose 4", "5. diagnose"],
+    "diagnose_5_icd": ["icd 5", "icd-10 5", "diagnose 5 icd"],
+    "diagnose_6": ["diagnose 6", "nebendiagnose 5", "6. diagnose"],
+    "diagnose_6_icd": ["icd 6", "icd-10 6", "diagnose 6 icd"],
+
+    # Anamnesis
+    "anamnese_beschwerden": ["anamnese", "beschwerden", "eigenanamnese", "aktuelle beschwerden", "symptome"],
+    "krankheitsverlauf": ["krankheitsverlauf", "verlauf", "bisherige behandlung", "behandlungsverlauf"],
+    "koerperlicher_befund": ["befund", "körperlicher befund", "aktueller befund", "untersuchungsbefund"],
+
+    # Functional limitations (checkboxes)
+    "mobilitaet_keine": ["mobilität keine", "mobilität: keine"],
+    "mobilitaet_gering": ["mobilität gering", "mobilität: gering"],
+    "mobilitaet_erheblich": ["mobilität erheblich", "mobilität: erheblich"],
+    "selbstversorgung_keine": ["selbstversorgung keine"],
+    "selbstversorgung_gering": ["selbstversorgung gering"],
+    "selbstversorgung_erheblich": ["selbstversorgung erheblich"],
+    "haushalt_keine": ["haushaltsführung keine", "haushalt keine"],
+    "haushalt_gering": ["haushaltsführung gering", "haushalt gering"],
+    "haushalt_erheblich": ["haushaltsführung erheblich", "haushalt erheblich"],
+    "erwerb_keine": ["erwerbstätigkeit keine", "erwerb keine"],
+    "erwerb_gering": ["erwerbstätigkeit gering", "erwerb gering"],
+    "erwerb_erheblich": ["erwerbstätigkeit erheblich", "erwerb erheblich"],
+    "kommunikation_keine": ["kommunikation keine"],
+    "kommunikation_gering": ["kommunikation gering"],
+    "kommunikation_erheblich": ["kommunikation erheblich"],
+    "psyche_keine": ["psychische belastbarkeit keine", "psyche keine"],
+    "psyche_gering": ["psychische belastbarkeit gering", "psyche gering"],
+    "psyche_erheblich": ["psychische belastbarkeit erheblich", "psyche erheblich"],
+    "beeintraechtigungen_erlaeuterung": ["beeinträchtigungen erläuterung", "erläuterungen beeinträchtigungen"],
+
+    # Medication
+    "medikament_1": ["medikament 1", "medikation 1"],
+    "medikament_1_dosis": ["dosis 1", "medikament 1 dosis"],
+    "medikament_1_seit": ["seit 1", "medikament 1 seit"],
+    "medikament_2": ["medikament 2", "medikation 2"],
+    "medikament_2_dosis": ["dosis 2", "medikament 2 dosis"],
+    "medikament_2_seit": ["seit 2", "medikament 2 seit"],
+    "medikament_3": ["medikament 3", "medikation 3"],
+    "medikament_3_dosis": ["dosis 3", "medikament 3 dosis"],
+    "medikament_3_seit": ["seit 3", "medikament 3 seit"],
+    "medikament_4": ["medikament 4", "medikation 4"],
+    "medikament_4_dosis": ["dosis 4", "medikament 4 dosis"],
+    "medikament_4_seit": ["seit 4", "medikament 4 seit"],
+    "medikament_5": ["medikament 5", "medikation 5"],
+    "medikament_5_dosis": ["dosis 5", "medikament 5 dosis"],
+    "medikament_5_seit": ["seit 5", "medikament 5 seit"],
+    "physikalische_therapie": ["physikalische therapie", "heilmittel", "physiotherapie", "krankengymnastik"],
+
+    # Previous rehab
+    "reha_1_zeitraum": ["reha 1 zeitraum", "frühere reha 1 zeitraum"],
+    "reha_1_einrichtung": ["reha 1 einrichtung", "frühere reha 1 einrichtung"],
+    "reha_1_erfolg": ["reha 1 erfolg", "frühere reha 1 erfolg"],
+    "reha_2_zeitraum": ["reha 2 zeitraum", "frühere reha 2 zeitraum"],
+    "reha_2_einrichtung": ["reha 2 einrichtung", "frühere reha 2 einrichtung"],
+    "reha_2_erfolg": ["reha 2 erfolg", "frühere reha 2 erfolg"],
+
+    # Assessment
+    "leistungsvermoegen_checkbox_vollschichtig": ["vollschichtig", "leistungsvermögen vollschichtig", "6 stunden und mehr"],
+    "leistungsvermoegen_checkbox_teilschichtig": ["teilschichtig", "leistungsvermögen 3-6", "3-6 stunden"],
+    "leistungsvermoegen_checkbox_unter3": ["unter 3 stunden", "leistungsvermögen unter 3"],
+    "reha_beduerftig_begruendung": ["rehabilitationsbedürftigkeit", "reha begründung", "reha bedürftigkeit"],
+    "reha_ziel": ["rehabilitationsziel", "reha ziel", "therapieziel"],
+    "reha_stationaer": ["stationär", "stationäre reha"],
+    "reha_ambulant": ["ambulant", "ambulante reha"],
+    "reha_ganztaegig": ["ganztägig ambulant", "teilstationär"],
+    "reha_einrichtung_empfehlung": ["empfohlene einrichtung", "reha einrichtung", "klinikempfehlung"],
+
+    # Travel capability
+    "reisefaehig_ja": ["reisefähig ja", "öffentliche verkehrsmittel ja"],
+    "reisefaehig_nein": ["reisefähig nein", "öffentliche verkehrsmittel nein"],
+    "reisefaehig_begruendung": ["reisefähigkeit begründung", "nicht reisefähig weil"],
+    "begleitperson_ja": ["begleitperson ja", "begleitperson erforderlich"],
+    "begleitperson_nein": ["begleitperson nein", "keine begleitperson"],
+
+    # Additional
+    "ergaenzende_angaben": ["ergänzende angaben", "zusätzliche informationen", "bemerkungen", "sonstiges"],
+
+    # Attachments
+    "anlage_laborbefunde": ["anlage laborbefunde", "laborbefunde"],
+    "anlage_roentgen": ["anlage röntgen", "bildgebende befunde", "röntgenbefunde"],
+    "anlage_arztbriefe": ["anlage arztbriefe", "arztbriefe"],
+    "anlage_krankenhausberichte": ["anlage krankenhausberichte", "krankenhausberichte", "entlassungsberichte"],
+    "anlage_sonstige": ["anlage sonstige", "sonstige anlagen"],
+    "anlage_sonstige_text": ["sonstige anlagen text", "anlage sonstige bezeichnung"],
+
+    # Signature
+    "unterschrift_datum": ["unterschrift datum", "datum unterschrift", "ausstellungsdatum"],
+    "arzt_name": ["arzt name", "name des arztes", "behandelnder arzt"],
+    "arzt_fachrichtung": ["facharztbezeichnung", "fachrichtung", "facharzt"],
+    "praxis_anschrift": ["praxis anschrift", "praxisadresse", "arztpraxis"],
+    "praxis_telefon": ["praxis telefon", "praxis tel"],
+    "bsnr": ["bsnr", "betriebsstättennummer"],
+    "lanr": ["lanr", "lebenslange arztnummer"],
+}
+
+
+def normalize_label(label: str) -> str:
+    """Normalize a label for matching."""
+    return label.lower().strip().replace(':', '').replace('_', ' ')
+
+
+def map_fields_to_template(extracted_fields: list, template_mapping: dict) -> dict:
+    """
+    Map extracted fields to template variables using fuzzy matching.
+
+    Args:
+        extracted_fields: List of {label, value, ...} dicts from AI extraction
+        template_mapping: Dict mapping template vars to possible label variations
+
+    Returns:
+        Dict of template variables to values
+    """
+    result = {}
+
+    # Build reverse mapping: normalized label -> template var
+    reverse_map = {}
+    for template_var, possible_labels in template_mapping.items():
+        for label in possible_labels:
+            reverse_map[normalize_label(label)] = template_var
+
+    # Map each extracted field
+    for field in extracted_fields:
+        label = normalize_label(field.get('label', ''))
+        value = field.get('value', '')
+
+        if not label or not value:
+            continue
+
+        # Direct match
+        if label in reverse_map:
+            result[reverse_map[label]] = value
+            continue
+
+        # Fuzzy match: check if any mapping label is contained in the extracted label
+        for possible_label, template_var in reverse_map.items():
+            if possible_label in label or label in possible_label:
+                result[template_var] = value
+                break
+
+    return result
+
+
+@app.route('/api/health', methods=['GET'])
+def health_check():
+    """Health check endpoint."""
+    return jsonify({'status': 'ok', 'service': 'latex-form-generator'})
+
+
+@app.route('/api/templates', methods=['GET'])
+def get_templates():
+    """List available LaTeX templates."""
+    templates = list_templates()
+    return jsonify({'templates': templates})
+
+
+@app.route('/api/generate', methods=['POST'])
+def generate_pdf():
+    """
+    Generate a filled PDF from a template and field data.
+
+    Request body:
+    {
+        "template": "G2210-11",
+        "fields": [
+            {"label": "Name, Vorname", "value": "Müller, Hans"},
+            {"label": "Geburtsdatum", "value": "01.01.1970"},
+            ...
+        ]
+    }
+
+    Returns: PDF file or base64-encoded PDF
+    """
+    try:
+        data = request.get_json()
+
+        if not data:
+            return jsonify({'error': 'No JSON data provided'}), 400
+
+        template_name = data.get('template', 'G2210-11')
+        extracted_fields = data.get('fields', [])
+        return_format = data.get('format', 'base64')  # 'base64' or 'file'
+
+        # Get the appropriate field mapping
+        if template_name == 'G2210-11':
+            field_mapping = G2210_FIELD_MAPPING
+        else:
+            # For other templates, try direct field names
+            field_mapping = {}
+
+        # Map extracted fields to template variables
+        if field_mapping:
+            template_fields = map_fields_to_template(extracted_fields, field_mapping)
+        else:
+            # Direct mapping: use label as key
+            template_fields = {normalize_label(f['label']).replace(' ', '_'): f['value']
+                             for f in extracted_fields if f.get('value')}
+
+        # Generate PDF
+        pdf_bytes = generate_form(template_name, template_fields)
+
+        if return_format == 'file':
+            return send_file(
+                io.BytesIO(pdf_bytes),
+                mimetype='application/pdf',
+                as_attachment=True,
+                download_name=f'{template_name}_filled.pdf'
+            )
+        else:
+            # Return base64
+            pdf_base64 = base64.b64encode(pdf_bytes).decode('ascii')
+            return jsonify({
+                'success': True,
+                'pdf': pdf_base64,
+                'mapped_fields': template_fields
+            })
+
+    except FileNotFoundError as e:
+        return jsonify({'error': str(e)}), 404
+    except Exception as e:
+        return jsonify({'error': f'Generation failed: {str(e)}'}), 500
+
+
+@app.route('/api/preview', methods=['POST'])
+def preview_latex():
+    """
+    Preview the filled LaTeX source (for debugging).
+
+    Same request format as /api/generate.
+    Returns the LaTeX source instead of compiled PDF.
+    """
+    try:
+        data = request.get_json()
+
+        if not data:
+            return jsonify({'error': 'No JSON data provided'}), 400
+
+        template_name = data.get('template', 'G2210-11')
+        extracted_fields = data.get('fields', [])
+
+        # Get the appropriate field mapping
+        if template_name == 'G2210-11':
+            field_mapping = G2210_FIELD_MAPPING
+        else:
+            field_mapping = {}
+
+        # Map extracted fields to template variables
+        if field_mapping:
+            template_fields = map_fields_to_template(extracted_fields, field_mapping)
+        else:
+            template_fields = {normalize_label(f['label']).replace(' ', '_'): f['value']
+                             for f in extracted_fields if f.get('value')}
+
+        # Load and fill template
+        template = load_template(template_name)
+        filled = fill_template(template, template_fields)
+
+        return jsonify({
+            'success': True,
+            'latex': filled,
+            'mapped_fields': template_fields
+        })
+
+    except Exception as e:
+        return jsonify({'error': str(e)}), 500
+
+
+@app.route('/api/field-mapping/<template_name>', methods=['GET'])
+def get_field_mapping(template_name):
+    """Get the field mapping for a specific template."""
+    if template_name == 'G2210-11':
+        return jsonify({
+            'template': template_name,
+            'fields': list(G2210_FIELD_MAPPING.keys()),
+            'mapping': G2210_FIELD_MAPPING
+        })
+    else:
+        return jsonify({'error': 'Unknown template'}), 404
+
+
+if __name__ == '__main__':
+    port = int(os.environ.get('PORT', 5000))
+    debug = os.environ.get('FLASK_DEBUG', 'false').lower() == 'true'
+    app.run(host='0.0.0.0', port=port, debug=debug)

services/geminiService.ts

@@ -2,6 +2,7 @@ import { GoogleGenAI, Type, Schema } from "@google/genai";
 import { FileData, FormResponse } from "../types";
 import { PdfFieldInfo } from "./pdfService";
 import { getApiKey } from "./apiKeyService";
+import { detectTemplate, getExpectedFields } from "./latexService";
 
 const getAI = () => {
   const apiKey = getApiKey();
@@ -75,12 +76,98 @@ const responseSchema: Schema = {
   required: ["fields", "summary"]
 };
 
+// G2210-11 specific field definitions for better extraction
+const G2210_FIELDS = `
+REQUIRED FIELDS FOR G2210-11 (Ärztlicher Befundbericht):
+Extract ALL of the following fields from the source document:
+
+PATIENT DATA:
+- Versicherungsnummer (e.g., "12 345678 A 123")
+- ABT.-Nr. (Aktenzeichen/Abteilungsnummer)
+- Name, Vorname (Full name: "Nachname, Vorname")
+- Geburtsdatum (format: DD.MM.YYYY)
+- Geschlecht (männlich/weiblich/divers)
+- Straße, Hausnummer
+- PLZ
+- Ort
+- Telefon
+- Krankenkasse
+
+EMPLOYMENT:
+- Derzeitige Tätigkeit (Beruf)
+- Arbeitgeber
+- Arbeitsunfähig seit (date: DD.MM.YYYY)
+- Letzte Arbeitsaufnahme
+
+DIAGNOSES (up to 6, with ICD-10 codes):
+- Diagnose 1 + Diagnose 1 ICD
+- Diagnose 2 + Diagnose 2 ICD
+- Diagnose 3 + Diagnose 3 ICD
+- Diagnose 4 + Diagnose 4 ICD
+- Diagnose 5 + Diagnose 5 ICD
+- Diagnose 6 + Diagnose 6 ICD
+
+ANAMNESIS:
+- Anamnese/Beschwerden (patient symptoms and history)
+- Krankheitsverlauf (disease progression, previous treatments)
+- Körperlicher Befund (physical examination findings)
+
+FUNCTIONAL LIMITATIONS (mark as "keine", "gering", or "erheblich"):
+- Mobilität keine/gering/erheblich
+- Selbstversorgung keine/gering/erheblich
+- Haushaltsführung keine/gering/erheblich
+- Erwerbstätigkeit keine/gering/erheblich
+- Kommunikation keine/gering/erheblich
+- Psychische Belastbarkeit keine/gering/erheblich
+- Beeinträchtigungen Erläuterung
+
+MEDICATION (up to 5):
+- Medikament 1 + Medikament 1 Dosis + Medikament 1 Seit
+- Medikament 2 + Medikament 2 Dosis + Medikament 2 Seit
+- Medikament 3 + Medikament 3 Dosis + Medikament 3 Seit
+- Medikament 4 + Medikament 4 Dosis + Medikament 4 Seit
+- Medikament 5 + Medikament 5 Dosis + Medikament 5 Seit
+- Physikalische Therapie
+
+PREVIOUS REHABILITATION:
+- Reha 1 Zeitraum + Reha 1 Einrichtung + Reha 1 Erfolg
+- Reha 2 Zeitraum + Reha 2 Einrichtung + Reha 2 Erfolg
+
+ASSESSMENT:
+- Leistungsvermögen (vollschichtig/3-6 Stunden/unter 3 Stunden)
+- Rehabilitationsbedürftigkeit (reasoning for rehab need)
+- Rehabilitationsziel
+- Rehabilitationsform (stationär/ambulant/ganztägig ambulant)
+- Reha Einrichtung Empfehlung
+
+TRAVEL:
+- Reisefähig (ja/nein)
+- Reisefähig Begründung (if no)
+- Begleitperson (ja/nein)
+
+ADDITIONAL:
+- Ergänzende Angaben
+
+DOCTOR INFORMATION:
+- Arzt Name
+- Facharztbezeichnung
+- Praxis Anschrift
+- Praxis Telefon
+- BSNR
+- LANR
+- Unterschrift Datum
+`;
+
 export const processDocuments = async (
   blankForm: FileData,
   sourceDocument: FileData,
   pdfFields: PdfFieldInfo[] = []
 ): Promise<FormResponse> => {
-  
+
+  // Detect if we have a known template
+  const detectedTemplate = detectTemplate(blankForm.file?.name || '');
+  const expectedFields = detectedTemplate ? getExpectedFields(detectedTemplate) : [];
+
   const formPart = {
     inlineData: {
       data: blankForm.base64,
@@ -98,11 +185,34 @@ export const processDocuments = async (
   let systemPrompt = `
     ROLE: Intelligent Document Processing AI (Verification Expert).
     TASK: Extract data from the SOURCE DOCUMENT and map it to the BLANK TARGET FORM.
-    
+
     CRITICAL INSTRUCTION: You must verify every extraction. If a value is ambiguous, plausibility is low, or you are guessing, set validation.status to 'WARNING' and explain why in validation.message.
   `;
 
-  if (pdfFields.length > 0) {
+  // Add template-specific instructions
+  if (detectedTemplate === 'G2210-11') {
+    systemPrompt += `
+      DETECTED FORM: G2210-11 (Ärztlicher Befundbericht der DRV Westfalen)
+
+      ${G2210_FIELDS}
+
+      IMPORTANT INSTRUCTIONS:
+      1. Extract ALL fields listed above, even if they are empty in the source.
+      2. Use the EXACT label names as listed above for each field.
+      3. For multi-value fields like diagnoses and medications, create separate field entries.
+      4. For checkbox fields (Mobilität, Selbstversorgung, etc.), return separate fields for each option.
+         Example: If mobility is "erheblich", return:
+         - "Mobilität keine" with value ""
+         - "Mobilität gering" with value ""
+         - "Mobilität erheblich" with value "true"
+      5. ICD-10 codes must be in standard format (e.g., "M54.5", "F32.1")
+      6. Dates must be in DD.MM.YYYY format.
+      7. For Leistungsvermögen, return separate checkbox fields:
+         - "Leistungsvermögen vollschichtig" (true/false)
+         - "Leistungsvermögen 3-6 Stunden" (true/false)
+         - "Leistungsvermögen unter 3 Stunden" (true/false)
+    `;
+  } else if (pdfFields.length > 0) {
     const fieldList = pdfFields.map(f => `"${f.name}" (${f.type})`).join(", ");
     systemPrompt += `
       MODE: FILLABLE PDF (AcroForm).
@@ -110,12 +220,18 @@ export const processDocuments = async (
       Map extracted data to these exact field IDs: [${fieldList}].
       Return the 'key' property matching the field ID.
     `;
+  } else if (expectedFields.length > 0) {
+    systemPrompt += `
+      MODE: TEMPLATE-BASED EXTRACTION.
+      Extract the following specific fields: [${expectedFields.join(", ")}].
+      Use these exact label names in your response.
+    `;
   } else {
     systemPrompt += `
       MODE: VISUAL FILLING (Flat/XFA/Scan).
       The target form DOES NOT have accessible digital fields.
       You must VISUALLY locate where the text should be written.
-      
+
       For every field you identify on the TARGET FORM:
       1. Extract the corresponding value from the SOURCE DOCUMENT.
       2. Estimate the VISUAL COORDINATES [pageIndex, x, y] where the text should start.
@@ -123,7 +239,7 @@ export const processDocuments = async (
          - (0,0) is the top-left corner of the page.
          - (1000,1000) is the bottom-right corner.
          - Align text slightly above lines or inside boxes.
-      
+
       For checkboxes: If true/yes, the value should be "X" placed inside the box.
     `;
   }

services/latexService.ts

@@ -0,0 +1,251 @@
+/**
+ * LaTeX Form Generation Service
+ *
+ * This service communicates with the Python LaTeX backend to generate
+ * filled PDF forms using LaTeX templates.
+ */
+
+import { ExtractedField } from '../types';
+
+// Backend API URL - can be configured via environment variable
+const API_BASE_URL = import.meta.env.VITE_LATEX_API_URL || 'http://localhost:5000';
+
+export interface LatexGenerationResult {
+  success: boolean;
+  pdf?: string; // base64 encoded PDF
+  mappedFields?: Record<string, string>;
+  error?: string;
+}
+
+export interface TemplateInfo {
+  name: string;
+  fields: string[];
+}
+
+/**
+ * Check if the LaTeX backend is available
+ */
+export const isLatexServiceAvailable = async (): Promise<boolean> => {
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/health`, {
+      method: 'GET',
+      signal: AbortSignal.timeout(3000),
+    });
+    return response.ok;
+  } catch {
+    return false;
+  }
+};
+
+/**
+ * Get list of available LaTeX templates
+ */
+export const getAvailableTemplates = async (): Promise<string[]> => {
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/templates`);
+    if (!response.ok) {
+      throw new Error('Failed to fetch templates');
+    }
+    const data = await response.json();
+    return data.templates || [];
+  } catch (error) {
+    console.warn('Could not fetch templates:', error);
+    return [];
+  }
+};
+
+/**
+ * Get field mapping for a specific template
+ */
+export const getTemplateFieldMapping = async (templateName: string): Promise<Record<string, string[]> | null> => {
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/field-mapping/${templateName}`);
+    if (!response.ok) {
+      return null;
+    }
+    const data = await response.json();
+    return data.mapping || null;
+  } catch (error) {
+    console.warn('Could not fetch field mapping:', error);
+    return null;
+  }
+};
+
+/**
+ * Generate a filled PDF using LaTeX template
+ */
+export const generateLatexPdf = async (
+  templateName: string,
+  fields: ExtractedField[]
+): Promise<LatexGenerationResult> => {
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/generate`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        template: templateName,
+        fields: fields.map(f => ({
+          label: f.label,
+          value: f.value,
+          key: f.key,
+        })),
+        format: 'base64',
+      }),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `HTTP ${response.status}`);
+    }
+
+    const data = await response.json();
+    return {
+      success: true,
+      pdf: data.pdf,
+      mappedFields: data.mapped_fields,
+    };
+  } catch (error) {
+    console.error('LaTeX PDF generation failed:', error);
+    return {
+      success: false,
+      error: error instanceof Error ? error.message : 'Unknown error',
+    };
+  }
+};
+
+/**
+ * Preview the filled LaTeX source (for debugging)
+ */
+export const previewLatexSource = async (
+  templateName: string,
+  fields: ExtractedField[]
+): Promise<{ latex?: string; error?: string }> => {
+  try {
+    const response = await fetch(`${API_BASE_URL}/api/preview`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        template: templateName,
+        fields: fields.map(f => ({
+          label: f.label,
+          value: f.value,
+          key: f.key,
+        })),
+      }),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `HTTP ${response.status}`);
+    }
+
+    const data = await response.json();
+    return { latex: data.latex };
+  } catch (error) {
+    return { error: error instanceof Error ? error.message : 'Unknown error' };
+  }
+};
+
+/**
+ * Convert base64 PDF to Blob URL for preview/download
+ */
+export const base64ToBlob = (base64: string, mimeType: string = 'application/pdf'): Blob => {
+  const byteCharacters = atob(base64);
+  const byteNumbers = new Array(byteCharacters.length);
+  for (let i = 0; i < byteCharacters.length; i++) {
+    byteNumbers[i] = byteCharacters.charCodeAt(i);
+  }
+  const byteArray = new Uint8Array(byteNumbers);
+  return new Blob([byteArray], { type: mimeType });
+};
+
+/**
+ * Detect which template to use based on form file name or content
+ */
+export const detectTemplate = (fileName: string): string | null => {
+  const lowerName = fileName.toLowerCase();
+
+  // G2210-11 Ärztlicher Befundbericht
+  if (lowerName.includes('g2210') ||
+      lowerName.includes('befundbericht') ||
+      lowerName.includes('aerztlicher') ||
+      lowerName.includes('ärztlicher')) {
+    return 'G2210-11';
+  }
+
+  // Add more template detection patterns here
+  // if (lowerName.includes('s0051')) return 'S0051';
+
+  return null;
+};
+
+/**
+ * Get expected fields for a known form type
+ * This helps the AI extraction know what fields to look for
+ */
+export const getExpectedFields = (templateName: string): string[] => {
+  const fieldMappings: Record<string, string[]> = {
+    'G2210-11': [
+      'Versicherungsnummer',
+      'ABT.-Nr.',
+      'Name, Vorname',
+      'Geburtsdatum',
+      'Geschlecht',
+      'Straße, Hausnummer',
+      'PLZ',
+      'Ort',
+      'Telefon',
+      'Krankenkasse',
+      'Derzeitige Tätigkeit',
+      'Arbeitgeber',
+      'Arbeitsunfähig seit',
+      'Diagnose 1',
+      'Diagnose 1 ICD',
+      'Diagnose 2',
+      'Diagnose 2 ICD',
+      'Diagnose 3',
+      'Diagnose 3 ICD',
+      'Diagnose 4',
+      'Diagnose 4 ICD',
+      'Diagnose 5',
+      'Diagnose 5 ICD',
+      'Diagnose 6',
+      'Diagnose 6 ICD',
+      'Anamnese/Beschwerden',
+      'Krankheitsverlauf',
+      'Körperlicher Befund',
+      'Mobilität (keine/gering/erheblich)',
+      'Selbstversorgung (keine/gering/erheblich)',
+      'Haushaltsführung (keine/gering/erheblich)',
+      'Erwerbstätigkeit (keine/gering/erheblich)',
+      'Medikament 1',
+      'Medikament 1 Dosis',
+      'Medikament 2',
+      'Medikament 2 Dosis',
+      'Medikament 3',
+      'Medikament 3 Dosis',
+      'Physikalische Therapie',
+      'Frühere Reha Zeitraum',
+      'Frühere Reha Einrichtung',
+      'Leistungsvermögen',
+      'Rehabilitationsbedürftigkeit',
+      'Rehabilitationsziel',
+      'Rehabilitationsform (stationär/ambulant)',
+      'Reisefähig (ja/nein)',
+      'Begleitperson erforderlich (ja/nein)',
+      'Ergänzende Angaben',
+      'Arzt Name',
+      'Facharztbezeichnung',
+      'Praxis Anschrift',
+      'Praxis Telefon',
+      'BSNR',
+      'LANR',
+    ],
+  };
+
+  return fieldMappings[templateName] || [];
+};

templates/G2210-11.tex

@@ -0,0 +1,353 @@
+\documentclass[a4paper,10pt]{article}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage[ngerman]{babel}
+\usepackage[margin=1.5cm,top=1cm,bottom=1.5cm]{geometry}
+\usepackage{array}
+\usepackage{tabularx}
+\usepackage{booktabs}
+\usepackage{multirow}
+\usepackage{graphicx}
+\usepackage{xcolor}
+\usepackage{helvet}
+\usepackage{amssymb}
+\usepackage{tikz}
+\usepackage{fancyhdr}
+\usepackage{lastpage}
+\usepackage{enumitem}
+
+\renewcommand{\familydefault}{\sfdefault}
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{0.3em}
+
+% Custom colors
+\definecolor{drvblue}{RGB}{0,51,102}
+\definecolor{lightgray}{RGB}{240,240,240}
+\definecolor{bordergray}{RGB}{180,180,180}
+
+% Header and Footer
+\pagestyle{fancy}
+\fancyhf{}
+\renewcommand{\headrulewidth}{0pt}
+\fancyfoot[C]{\footnotesize Seite \thepage\ von \pageref{LastPage}}
+\fancyfoot[R]{\footnotesize G2210-11 (01.2025)}
+
+% Custom commands
+\newcommand{\formfield}[2]{\textbf{#1:} #2}
+\newcommand{\formbox}[1]{\fbox{\parbox{0.95\linewidth}{#1}}}
+\newcommand{\sectionheader}[1]{\colorbox{lightgray}{\parbox{\dimexpr\linewidth-2\fboxsep}{\textbf{#1}}}}
+
+\begin{document}
+
+% === HEADER ===
+\begin{center}
+{\Large\bfseries\color{drvblue} Deutsche Rentenversicherung Westfalen}\\[0.3em]
+{\large Ärztlicher Befundbericht}\\[0.2em]
+{\small zum Antrag auf Leistungen zur medizinischen Rehabilitation}\\[0.5em]
+\hrule
+\end{center}
+
+\vspace{0.5em}
+
+% === PATIENT DATA ===
+\sectionheader{1. Angaben zur versicherten Person}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|p{4cm}|X|p{4cm}|X|}
+\hline
+\textbf{Versicherungsnummer:} & {{versicherungsnummer}} & \textbf{ABT.-Nr.:} & {{abt_nr}} \\
+\hline
+\textbf{Name, Vorname:} & \multicolumn{3}{l|}{{{name_vorname}}} \\
+\hline
+\textbf{Geburtsdatum:} & {{geburtsdatum|date}} & \textbf{Geschlecht:} & {{geschlecht}} \\
+\hline
+\textbf{Straße, Hausnummer:} & \multicolumn{3}{l|}{{{strasse}}} \\
+\hline
+\textbf{PLZ, Ort:} & \multicolumn{3}{l|}{{{plz}} {{ort}}} \\
+\hline
+\textbf{Telefon:} & {{telefon}} & \textbf{Krankenkasse:} & {{krankenkasse}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === EMPLOYMENT ===
+\sectionheader{2. Angaben zur beruflichen Situation}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|p{5cm}|X|}
+\hline
+\textbf{Derzeitige Tätigkeit:} & {{beruf_taetigkeit}} \\
+\hline
+\textbf{Arbeitgeber:} & {{arbeitgeber}} \\
+\hline
+\textbf{Arbeitsunfähig seit:} & {{au_seit|date}} \\
+\hline
+\textbf{Letzte Arbeitsaufnahme:} & {{letzte_arbeit|date}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === DIAGNOSES ===
+\sectionheader{3. Diagnosen (mit ICD-10-Schlüssel)}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|p{1cm}|X|p{2.5cm}|}
+\hline
+\textbf{Nr.} & \textbf{Diagnose} & \textbf{ICD-10} \\
+\hline
+1. & {{diagnose_1}} & {{diagnose_1_icd}} \\
+\hline
+2. & {{diagnose_2}} & {{diagnose_2_icd}} \\
+\hline
+3. & {{diagnose_3}} & {{diagnose_3_icd}} \\
+\hline
+4. & {{diagnose_4}} & {{diagnose_4_icd}} \\
+\hline
+5. & {{diagnose_5}} & {{diagnose_5_icd}} \\
+\hline
+6. & {{diagnose_6}} & {{diagnose_6_icd}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === ANAMNESIS ===
+\sectionheader{4. Anamnese und aktueller Befund}
+\vspace{0.3em}
+
+\textbf{4.1 Eigenanamnese / Beschwerden des Patienten:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{anamnese_beschwerden}} \\[4em]
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{4.2 Krankheitsverlauf / bisherige Behandlungen:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{krankheitsverlauf}} \\[4em]
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{4.3 Aktueller körperlicher Befund:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{koerperlicher_befund}} \\[4em]
+\hline
+\end{tabularx}
+
+\newpage
+
+% === FUNCTIONAL LIMITATIONS ===
+\sectionheader{5. Nicht nur vorübergehende Beeinträchtigungen der Aktivitäten und Teilhabe}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|X|c|c|c|}
+\hline
+\textbf{Beeinträchtigungsbereich} & \textbf{Keine} & \textbf{Gering} & \textbf{Erheblich} \\
+\hline
+Mobilität (Gehen, Treppensteigen, Fortbewegung) & {{mobilitaet_keine|checkbox}} & {{mobilitaet_gering|checkbox}} & {{mobilitaet_erheblich|checkbox}} \\
+\hline
+Selbstversorgung (Waschen, Ankleiden, Essen) & {{selbstversorgung_keine|checkbox}} & {{selbstversorgung_gering|checkbox}} & {{selbstversorgung_erheblich|checkbox}} \\
+\hline
+Haushaltsführung & {{haushalt_keine|checkbox}} & {{haushalt_gering|checkbox}} & {{haushalt_erheblich|checkbox}} \\
+\hline
+Erwerbstätigkeit & {{erwerb_keine|checkbox}} & {{erwerb_gering|checkbox}} & {{erwerb_erheblich|checkbox}} \\
+\hline
+Kommunikation & {{kommunikation_keine|checkbox}} & {{kommunikation_gering|checkbox}} & {{kommunikation_erheblich|checkbox}} \\
+\hline
+Psychische Belastbarkeit & {{psyche_keine|checkbox}} & {{psyche_gering|checkbox}} & {{psyche_erheblich|checkbox}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{Erläuterungen zu den Beeinträchtigungen:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{beeintraechtigungen_erlaeuterung}} \\[3em]
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === THERAPY ===
+\sectionheader{6. Bisherige und aktuelle Therapie}
+\vspace{0.3em}
+
+\textbf{6.1 Aktuelle Medikation:}
+\begin{tabularx}{\linewidth}{|X|p{2cm}|p{2.5cm}|}
+\hline
+\textbf{Medikament} & \textbf{Dosis} & \textbf{Seit wann} \\
+\hline
+{{medikament_1}} & {{medikament_1_dosis}} & {{medikament_1_seit}} \\
+\hline
+{{medikament_2}} & {{medikament_2_dosis}} & {{medikament_2_seit}} \\
+\hline
+{{medikament_3}} & {{medikament_3_dosis}} & {{medikament_3_seit}} \\
+\hline
+{{medikament_4}} & {{medikament_4_dosis}} & {{medikament_4_seit}} \\
+\hline
+{{medikament_5}} & {{medikament_5_dosis}} & {{medikament_5_seit}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{6.2 Physikalische Therapie / Heilmittel:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{physikalische_therapie}} \\[2em]
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === PREVIOUS REHAB ===
+\sectionheader{7. Frühere Rehabilitationsmaßnahmen}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|p{3cm}|X|p{2.5cm}|}
+\hline
+\textbf{Zeitraum} & \textbf{Einrichtung / Art} & \textbf{Erfolg} \\
+\hline
+{{reha_1_zeitraum}} & {{reha_1_einrichtung}} & {{reha_1_erfolg}} \\
+\hline
+{{reha_2_zeitraum}} & {{reha_2_einrichtung}} & {{reha_2_erfolg}} \\
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === ASSESSMENT ===
+\sectionheader{8. Ärztliche Beurteilung}
+\vspace{0.3em}
+
+\textbf{8.1 Leistungsvermögen im bisherigen Beruf:}\\
+{{leistungsvermoegen_checkbox_vollschichtig|checkbox}} Vollschichtig (6 Std. und mehr) \quad
+{{leistungsvermoegen_checkbox_teilschichtig|checkbox}} 3-6 Stunden \quad
+{{leistungsvermoegen_checkbox_unter3|checkbox}} Unter 3 Stunden
+
+\vspace{0.3em}
+
+\textbf{8.2 Rehabilitationsbedürftigkeit:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{reha_beduerftig_begruendung}} \\[3em]
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{8.3 Rehabilitationsziel:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{reha_ziel}} \\[2em]
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{8.4 Empfohlene Rehabilitationsform:}\\
+{{reha_stationaer|checkbox}} Stationär \quad
+{{reha_ambulant|checkbox}} Ambulant \quad
+{{reha_ganztaegig|checkbox}} Ganztägig ambulant
+
+\vspace{0.3em}
+
+\textbf{8.5 Empfohlene Rehabilitationseinrichtung (falls bekannt):}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{reha_einrichtung_empfehlung}} \\[1em]
+\hline
+\end{tabularx}
+
+\newpage
+
+% === TRAVEL CAPABILITY ===
+\sectionheader{9. Reisefähigkeit}
+\vspace{0.3em}
+
+\textbf{Kann der Patient mit öffentlichen Verkehrsmitteln reisen?}\\
+{{reisefaehig_ja|checkbox}} Ja \quad
+{{reisefaehig_nein|checkbox}} Nein
+
+\vspace{0.2em}
+\textbf{Falls nein, Begründung:}
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{reisefaehig_begruendung}} \\[2em]
+\hline
+\end{tabularx}
+
+\vspace{0.3em}
+
+\textbf{Begleitperson erforderlich?}\\
+{{begleitperson_ja|checkbox}} Ja \quad
+{{begleitperson_nein|checkbox}} Nein
+
+\vspace{0.5em}
+
+% === ADDITIONAL INFO ===
+\sectionheader{10. Ergänzende Angaben}
+\vspace{0.3em}
+
+\begin{tabularx}{\linewidth}{|X|}
+\hline
+{{ergaenzende_angaben}} \\[4em]
+\hline
+\end{tabularx}
+
+\vspace{0.5em}
+
+% === ATTACHMENTS ===
+\sectionheader{11. Anlagen}
+\vspace{0.3em}
+
+{{anlage_laborbefunde|checkbox}} Laborbefunde \quad
+{{anlage_roentgen|checkbox}} Röntgen-/Bildgebende Befunde \quad
+{{anlage_arztbriefe|checkbox}} Arztbriefe\\
+{{anlage_krankenhausberichte|checkbox}} Krankenhausberichte \quad
+{{anlage_sonstige|checkbox}} Sonstige: {{anlage_sonstige_text}}
+
+\vspace{1em}
+
+% === SIGNATURE ===
+\sectionheader{12. Unterschrift des behandelnden Arztes}
+\vspace{0.5em}
+
+\begin{tabularx}{\linewidth}{|p{5cm}|X|}
+\hline
+\textbf{Datum:} & {{unterschrift_datum|date}} \\
+\hline
+\textbf{Name des Arztes:} & {{arzt_name}} \\
+\hline
+\textbf{Facharztbezeichnung:} & {{arzt_fachrichtung}} \\
+\hline
+\textbf{Anschrift Praxis:} & {{praxis_anschrift}} \\
+\hline
+\textbf{Telefon:} & {{praxis_telefon}} \\
+\hline
+\textbf{BSNR/LANR:} & {{bsnr}} / {{lanr}} \\
+\hline
+\end{tabularx}
+
+\vspace{1.5em}
+
+\begin{tabularx}{\linewidth}{X X}
+\hrulefill & \hrulefill \\
+Ort, Datum & Unterschrift und Stempel \\
+\end{tabularx}
+
+\vspace{1em}
+
+\footnotesize
+\textit{Hinweis: Die Angaben werden vertraulich behandelt und unterliegen dem Sozialgeheimnis nach § 35 SGB I.}
+
+\end{document}