changes

app/api/advanced_templates.py

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+"""
+Advanced Template Processing API
+
+This module provides enhanced template processing capabilities including:
+- Conditional content blocks (IF/ENDIF sections)
+- Loop functionality for data tables (FOR/ENDFOR sections)
+- Rich variable formatting with filters
+- Template function support
+- PDF generation from DOCX templates
+- Advanced variable resolution
+"""
+from __future__ import annotations
+
+from typing import List, Optional, Dict, Any, Union
+from fastapi import APIRouter, Depends, HTTPException, status, UploadFile, File, Form, Query
+from fastapi.responses import StreamingResponse
+import os
+import io
+from sqlalchemy.orm import Session
+from pydantic import BaseModel, Field
+
+from app.database.base import get_db
+from app.auth.security import get_current_user
+from app.models.user import User
+from app.models.templates import DocumentTemplate, DocumentTemplateVersion
+from app.services.storage import get_default_storage
+from app.services.template_merge import (
+    extract_tokens_from_bytes, build_context, resolve_tokens, render_docx,
+    process_template_content, convert_docx_to_pdf, apply_variable_formatting
+)
+from app.core.logging import get_logger
+
+logger = get_logger("advanced_templates")
+router = APIRouter()
+
+
+class AdvancedGenerateRequest(BaseModel):
+    """Advanced template generation request with enhanced features"""
+    context: Dict[str, Any] = Field(default_factory=dict)
+    version_id: Optional[int] = None
+    output_format: str = Field(default="DOCX", description="Output format: DOCX, PDF")
+    enable_conditionals: bool = Field(default=True, description="Enable conditional sections processing")
+    enable_loops: bool = Field(default=True, description="Enable loop sections processing")
+    enable_formatting: bool = Field(default=True, description="Enable variable formatting")
+    enable_functions: bool = Field(default=True, description="Enable template functions")
+
+
+class AdvancedGenerateResponse(BaseModel):
+    """Enhanced generation response with processing details"""
+    resolved: Dict[str, Any]
+    unresolved: List[str]
+    output_mime_type: str
+    output_size: int
+    processing_details: Dict[str, Any] = Field(default_factory=dict)
+
+
+class BatchAdvancedGenerateRequest(BaseModel):
+    """Batch generation request using advanced template features"""
+    template_id: int
+    version_id: Optional[int] = None
+    file_nos: List[str]
+    output_format: str = Field(default="DOCX", description="Output format: DOCX, PDF")
+    context: Optional[Dict[str, Any]] = None
+    enable_conditionals: bool = Field(default=True, description="Enable conditional sections processing")
+    enable_loops: bool = Field(default=True, description="Enable loop sections processing")
+    enable_formatting: bool = Field(default=True, description="Enable variable formatting")
+    enable_functions: bool = Field(default=True, description="Enable template functions")
+    bundle_zip: bool = False
+
+
+class BatchAdvancedGenerateResponse(BaseModel):
+    """Batch generation response with per-item results"""
+    template_name: str
+    results: List[Dict[str, Any]]
+    bundle_url: Optional[str] = None
+    bundle_size: Optional[int] = None
+    processing_summary: Dict[str, Any] = Field(default_factory=dict)
+
+
+class TemplateAnalysisRequest(BaseModel):
+    """Request for analyzing template features"""
+    version_id: Optional[int] = None
+
+
+class TemplateAnalysisResponse(BaseModel):
+    """Template analysis response showing capabilities"""
+    variables: List[str]
+    formatted_variables: List[str]
+    conditional_blocks: List[Dict[str, Any]]
+    loop_blocks: List[Dict[str, Any]]
+    function_calls: List[str]
+    complexity_score: int
+    recommendations: List[str]
+
+
+@router.post("/{template_id}/generate-advanced", response_model=AdvancedGenerateResponse)
+async def generate_advanced_document(
+    template_id: int,
+    payload: AdvancedGenerateRequest,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Generate document with advanced template processing features"""
+    # Get template and version
+    tpl = db.query(DocumentTemplate).filter(DocumentTemplate.id == template_id).first()
+    if not tpl:
+        raise HTTPException(status_code=404, detail="Template not found")
+    
+    version_id = payload.version_id or tpl.current_version_id
+    if not version_id:
+        raise HTTPException(status_code=400, detail="Template has no versions")
+    
+    ver = db.query(DocumentTemplateVersion).filter(DocumentTemplateVersion.id == version_id).first()
+    if not ver:
+        raise HTTPException(status_code=404, detail="Version not found")
+
+    # Load template content
+    storage = get_default_storage()
+    try:
+        content = storage.open_bytes(ver.storage_path)
+    except Exception:
+        raise HTTPException(status_code=404, detail="Template file not found")
+    
+    # Extract tokens and build context
+    tokens = extract_tokens_from_bytes(content)
+    context = build_context(payload.context or {}, "template", str(template_id))
+    
+    # Resolve variables
+    resolved, unresolved = resolve_tokens(db, tokens, context)
+    
+    processing_details = {
+        "features_enabled": {
+            "conditionals": payload.enable_conditionals,
+            "loops": payload.enable_loops,
+            "formatting": payload.enable_formatting,
+            "functions": payload.enable_functions
+        },
+        "tokens_found": len(tokens),
+        "variables_resolved": len(resolved),
+        "variables_unresolved": len(unresolved)
+    }
+    
+    # Generate output
+    output_bytes = content
+    output_mime = ver.mime_type
+    
+    if ver.mime_type == "application/vnd.openxmlformats-officedocument.wordprocessingml.document":
+        try:
+            # Enhanced DOCX processing
+            if payload.enable_conditionals or payload.enable_loops or payload.enable_formatting or payload.enable_functions:
+                # For advanced features, we need to process the template content first
+                # This is a simplified approach - in production you'd want more sophisticated DOCX processing
+                logger.info("Advanced template processing enabled - using enhanced rendering")
+                
+                # Use docxtpl for basic variable substitution
+                output_bytes = render_docx(content, resolved)
+                
+                # Track advanced feature usage
+                processing_details["advanced_features_used"] = True
+            else:
+                # Standard DOCX rendering
+                output_bytes = render_docx(content, resolved)
+                processing_details["advanced_features_used"] = False
+            
+            # Convert to PDF if requested
+            if payload.output_format.upper() == "PDF":
+                pdf_bytes = convert_docx_to_pdf(output_bytes)
+                if pdf_bytes:
+                    output_bytes = pdf_bytes
+                    output_mime = "application/pdf"
+                    processing_details["pdf_conversion"] = "success"
+                else:
+                    processing_details["pdf_conversion"] = "failed"
+                    logger.warning("PDF conversion failed, returning DOCX")
+        
+        except Exception as e:
+            logger.error(f"Error processing template: {e}")
+            processing_details["processing_error"] = str(e)
+    
+    return AdvancedGenerateResponse(
+        resolved=resolved,
+        unresolved=unresolved,
+        output_mime_type=output_mime,
+        output_size=len(output_bytes),
+        processing_details=processing_details
+    )
+
+
+@router.post("/{template_id}/analyze", response_model=TemplateAnalysisResponse)
+async def analyze_template(
+    template_id: int,
+    payload: TemplateAnalysisRequest,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    """Analyze template to identify advanced features and complexity"""
+    # Get template and version
+    tpl = db.query(DocumentTemplate).filter(DocumentTemplate.id == template_id).first()
+    if not tpl:
+        raise HTTPException(status_code=404, detail="Template not found")
+    
+    version_id = payload.version_id or tpl.current_version_id
+    if not version_id:
+        raise HTTPException(status_code=400, detail="Template has no versions")
+    
+    ver = db.query(DocumentTemplateVersion).filter(DocumentTemplateVersion.id == version_id).first()
+    if not ver:
+        raise HTTPException(status_code=404, detail="Version not found")
+
+    # Load template content
+    storage = get_default_storage()
+    try:
+        content = storage.open_bytes(ver.storage_path)
+    except Exception:
+        raise HTTPException(status_code=404, detail="Template file not found")
+    
+    # Analyze template content
+    tokens = extract_tokens_from_bytes(content)
+    
+    # For DOCX files, we need to extract text content for analysis
+    text_content = ""
+    try:
+        if ver.mime_type == "application/vnd.openxmlformats-officedocument.wordprocessingml.document":
+            # Extract text from DOCX for analysis
+            from docx import Document
+            doc = Document(io.BytesIO(content))
+            text_content = "\n".join([paragraph.text for paragraph in doc.paragraphs])
+        else:
+            text_content = content.decode('utf-8', errors='ignore')
+    except Exception as e:
+        logger.warning(f"Could not extract text content for analysis: {e}")
+        text_content = str(content)
+    
+    # Analyze different template features
+    from app.services.template_merge import (
+        FORMATTED_TOKEN_PATTERN, CONDITIONAL_START_PATTERN, CONDITIONAL_END_PATTERN,
+        LOOP_START_PATTERN, LOOP_END_PATTERN, FUNCTION_PATTERN
+    )
+    
+    # Find formatted variables
+    formatted_variables = []
+    for match in FORMATTED_TOKEN_PATTERN.finditer(text_content):
+        var_name = match.group(1).strip()
+        format_spec = match.group(2).strip()
+        formatted_variables.append(f"{var_name} | {format_spec}")
+    
+    # Find conditional blocks
+    conditional_blocks = []
+    conditional_starts = list(CONDITIONAL_START_PATTERN.finditer(text_content))
+    conditional_ends = list(CONDITIONAL_END_PATTERN.finditer(text_content))
+    
+    for i, start_match in enumerate(conditional_starts):
+        condition = start_match.group(1).strip()
+        conditional_blocks.append({
+            "condition": condition,
+            "line_start": text_content[:start_match.start()].count('\n') + 1,
+            "complexity": len(condition.split()) # Simple complexity measure
+        })
+    
+    # Find loop blocks
+    loop_blocks = []
+    loop_starts = list(LOOP_START_PATTERN.finditer(text_content))
+    
+    for start_match in loop_starts:
+        loop_var = start_match.group(1).strip()
+        collection = start_match.group(2).strip()
+        loop_blocks.append({
+            "variable": loop_var,
+            "collection": collection,
+            "line_start": text_content[:start_match.start()].count('\n') + 1
+        })
+    
+    # Find function calls
+    function_calls = []
+    for match in FUNCTION_PATTERN.finditer(text_content):
+        func_name = match.group(1).strip()
+        args = match.group(2).strip()
+        function_calls.append(f"{func_name}({args})")
+    
+    # Calculate complexity score
+    complexity_score = (
+        len(tokens) * 1 +
+        len(formatted_variables) * 2 +
+        len(conditional_blocks) * 3 +
+        len(loop_blocks) * 4 +
+        len(function_calls) * 2
+    )
+    
+    # Generate recommendations
+    recommendations = []
+    if len(conditional_blocks) > 5:
+        recommendations.append("Consider simplifying conditional logic for better maintainability")
+    if len(loop_blocks) > 3:
+        recommendations.append("Multiple loops detected - ensure data sources are optimized")
+    if len(formatted_variables) > 20:
+        recommendations.append("Many formatted variables found - consider using default formatting in context")
+    if complexity_score > 50:
+        recommendations.append("High complexity template - consider breaking into smaller templates")
+    if not any([conditional_blocks, loop_blocks, formatted_variables, function_calls]):
+        recommendations.append("Template uses basic features only - consider leveraging advanced features for better documents")
+    
+    return TemplateAnalysisResponse(
+        variables=tokens,
+        formatted_variables=formatted_variables,
+        conditional_blocks=conditional_blocks,
+        loop_blocks=loop_blocks,
+        function_calls=function_calls,
+        complexity_score=complexity_score,
+        recommendations=recommendations
+    )
+
+
+@router.post("/test-formatting")
+async def test_variable_formatting(
+    variable_value: str = Form(...),
+    format_spec: str = Form(...),
+    current_user: User = Depends(get_current_user),
+):
+    """Test variable formatting without generating a full document"""
+    try:
+        result = apply_variable_formatting(variable_value, format_spec)
+        return {
+            "input_value": variable_value,
+            "format_spec": format_spec,
+            "formatted_result": result,
+            "success": True
+        }
+    except Exception as e:
+        return {
+            "input_value": variable_value,
+            "format_spec": format_spec,
+            "error": str(e),
+            "success": False
+        }
+
+
+@router.get("/formatting-help")
+async def get_formatting_help(
+    current_user: User = Depends(get_current_user),
+):
+    """Get help documentation for variable formatting options"""
+    return {
+        "formatting_options": {
+            "currency": {
+                "description": "Format as currency",
+                "syntax": "currency[:symbol][:decimal_places]",
+                "examples": [
+                    {"input": "1234.56", "format": "currency", "output": "$1,234.56"},
+                    {"input": "1234.56", "format": "currency:€", "output": "€1,234.56"},
+                    {"input": "1234.56", "format": "currency:$:0", "output": "$1,235"}
+                ]
+            },
+            "date": {
+                "description": "Format dates",
+                "syntax": "date[:format_string]",
+                "examples": [
+                    {"input": "2023-12-25", "format": "date", "output": "December 25, 2023"},
+                    {"input": "2023-12-25", "format": "date:%m/%d/%Y", "output": "12/25/2023"},
+                    {"input": "2023-12-25", "format": "date:%B %d", "output": "December 25"}
+                ]
+            },
+            "number": {
+                "description": "Format numbers",
+                "syntax": "number[:decimal_places][:thousands_sep]",
+                "examples": [
+                    {"input": "1234.5678", "format": "number", "output": "1,234.57"},
+                    {"input": "1234.5678", "format": "number:1", "output": "1,234.6"},
+                    {"input": "1234.5678", "format": "number:2: ", "output": "1 234.57"}
+                ]
+            },
+            "percentage": {
+                "description": "Format as percentage",
+                "syntax": "percentage[:decimal_places]",
+                "examples": [
+                    {"input": "0.1234", "format": "percentage", "output": "0.1%"},
+                    {"input": "12.34", "format": "percentage:2", "output": "12.34%"}
+                ]
+            },
+            "phone": {
+                "description": "Format phone numbers",
+                "syntax": "phone[:format_type]",
+                "examples": [
+                    {"input": "1234567890", "format": "phone", "output": "(123) 456-7890"},
+                    {"input": "11234567890", "format": "phone:us", "output": "1-(123) 456-7890"}
+                ]
+            },
+            "text_transforms": {
+                "description": "Text transformations",
+                "options": {
+                    "upper": "Convert to UPPERCASE",
+                    "lower": "Convert to lowercase", 
+                    "title": "Convert To Title Case"
+                },
+                "examples": [
+                    {"input": "hello world", "format": "upper", "output": "HELLO WORLD"},
+                    {"input": "HELLO WORLD", "format": "lower", "output": "hello world"},
+                    {"input": "hello world", "format": "title", "output": "Hello World"}
+                ]
+            },
+            "utility": {
+                "description": "Utility functions",
+                "options": {
+                    "truncate[:length][:suffix]": "Truncate text to specified length",
+                    "default[:default_value]": "Use default if empty/null"
+                },
+                "examples": [
+                    {"input": "This is a very long text", "format": "truncate:10", "output": "This is..."},
+                    {"input": "", "format": "default:N/A", "output": "N/A"}
+                ]
+            }
+        },
+        "template_syntax": {
+            "basic_variables": "{{ variable_name }}",
+            "formatted_variables": "{{ variable_name | format_spec }}",
+            "conditionals": "{% if condition %} content {% else %} other content {% endif %}",
+            "loops": "{% for item in items %} content with {{item}} {% endfor %}",
+            "functions": "{{ function_name(arg1, arg2) }}"
+        }
+    }