#!/usr/bin/env python3
"""
PDF Label Dimension Analysis Tool
Analyzes the generated PDF to verify exact dimensions and content positioning
"""

import sys
import os
sys.path.append(os.path.join(os.path.dirname(__file__), 'app'))

from app.pdf_generator import LabelPDFGenerator, mm_to_points
from reportlab.lib.units import mm

def analyze_pdf_dimensions():
    """Analyze the PDF dimensions in detail"""
    print("=== PDF Label Dimension Analysis ===\n")
    
    generator = LabelPDFGenerator()
    
    # Label dimensions
    print("1. LABEL PHYSICAL DIMENSIONS:")
    print(f"   Width: {generator.label_width/mm:.1f}mm ({generator.label_width:.2f} points)")
    print(f"   Height: {generator.label_height/mm:.1f}mm ({generator.label_height:.2f} points)")
    print(f"   ✓ Should be exactly 80.0mm × 110.0mm")
    
    # Content area
    print(f"\n2. CONTENT AREA DIMENSIONS:")
    print(f"   Content Width: {generator.content_width/mm:.1f}mm")
    print(f"   Content Height: {generator.content_height/mm:.1f}mm")
    print(f"   Left margin: {generator.content_x/mm:.1f}mm")
    print(f"   Bottom margin: {generator.content_y/mm:.1f}mm")
    print(f"   Right margin: {(generator.label_width - generator.content_x - generator.content_width)/mm:.1f}mm")
    print(f"   Top margin: {(generator.label_height - generator.content_y - generator.content_height)/mm:.1f}mm")
    
    # Row analysis
    print(f"\n3. ROW LAYOUT:")
    total_rows = 9
    standard_rows = 8  # 7 standard + 1 double
    double_rows = 1
    
    standard_row_height_mm = generator.row_height/mm
    double_row_height_mm = generator.double_row_height/mm
    
    total_content_used = (standard_rows * standard_row_height_mm + double_rows * double_row_height_mm)
    expected_content_height = generator.content_height/mm
    
    print(f"   Standard row height: {standard_row_height_mm:.1f}mm")
    print(f"   Double row height: {double_row_height_mm:.1f}mm")
    print(f"   Total rows: {total_rows} (8 standard + 1 double)")
    print(f"   Content height used: {total_content_used:.1f}mm")
    print(f"   Content area available: {expected_content_height:.1f}mm")
    print(f"   Remaining space: {expected_content_height - total_content_used:.1f}mm")
    
    # Barcode area
    print(f"\n4. BARCODE AREA:")
    barcode_bottom_margin = generator.content_y/mm
    print(f"   Bottom barcode space: {barcode_bottom_margin:.1f}mm (should be ~12-15mm)")
    
    top_margin = (generator.label_height - generator.content_y - generator.content_height)/mm
    print(f"   Top margin space: {top_margin:.1f}mm")
    
    # Check for potential issues
    print(f"\n5. POTENTIAL ISSUES ANALYSIS:")
    
    # Check if content is too high
    if total_content_used > expected_content_height:
        print(f"   ⚠️ ISSUE: Content ({total_content_used:.1f}mm) exceeds available space ({expected_content_height:.1f}mm)")
    else:
        print(f"   ✓ Content fits within available space")
    
    # Check margins
    if barcode_bottom_margin < 10:
        print(f"   ⚠️ WARNING: Bottom margin ({barcode_bottom_margin:.1f}mm) may be too small for barcode")
    else:
        print(f"   ✓ Bottom margin adequate for barcode")
    
    if top_margin < 3:
        print(f"   ⚠️ WARNING: Top margin ({top_margin:.1f}mm) very small")
    else:
        print(f"   ✓ Top margin adequate")
    
    # Aspect ratio check
    aspect_ratio = generator.label_height / generator.label_width
    expected_ratio = 110.0 / 80.0  # 1.375
    
    print(f"\n6. ASPECT RATIO CHECK:")
    print(f"   Current ratio: {aspect_ratio:.3f}")
    print(f"   Expected ratio: {expected_ratio:.3f} (110/80)")
    
    if abs(aspect_ratio - expected_ratio) < 0.001:
        print(f"   ✓ Aspect ratio is correct")
    else:
        print(f"   ⚠️ Aspect ratio mismatch!")
    
    # Browser display notes
    print(f"\n7. BROWSER DISPLAY CONSIDERATIONS:")
    print(f"   • Browser zoom affects apparent size")
    print(f"   • PDF viewer scaling can change appearance")
    print(f"   • Monitor DPI affects screen dimensions")
    print(f"   • Print preview scaling may alter appearance")
    print(f"\n   🔧 SOLUTION: Always verify with physical printout at 100% scale")
    
    return {
        'width_mm': generator.label_width/mm,
        'height_mm': generator.label_height/mm,
        'content_height_mm': expected_content_height,
        'content_used_mm': total_content_used,
        'aspect_ratio': aspect_ratio,
        'expected_ratio': expected_ratio
    }

if __name__ == "__main__":
    results = analyze_pdf_dimensions()
    
    print(f"\n=== SUMMARY ===")
    if (abs(results['width_mm'] - 80.0) < 0.1 and 
        abs(results['height_mm'] - 110.0) < 0.1 and
        abs(results['aspect_ratio'] - results['expected_ratio']) < 0.001):
        print("✅ PDF dimensions are CORRECT: 80mm × 110mm")
        print("If labels appear too large, check:")
        print("  • Browser zoom level (should be 100%)")
        print("  • PDF viewer scaling settings")
        print("  • Print scaling (should be 'Actual size' or 100%)")
    else:
        print("❌ PDF dimensions need adjustment")