#!/usr/bin/env python3
"""Image to PDF converter using Pillow + reportlab."""
import argparse, json, sys, os
from pathlib import Path

def convert(input_paths, output_path):
    from PIL import Image
    from reportlab.lib.pagesizes import A4
    from reportlab.pdfgen import canvas
    
    if not output_path:
        output_path = str(Path(input_paths[0]).with_suffix('.pdf'))
    
    c = canvas.Canvas(output_path, pagesize=A4)
    page_w, page_h = A4
    margin = 36  # 0.5 inch
    
    for img_path in input_paths:
        img = Image.open(img_path)
        img_w, img_h = img.size
        
        available_w = page_w - 2 * margin
        available_h = page_h - 2 * margin
        
        scale = min(available_w / img_w, available_h / img_h)
        draw_w = img_w * scale
        draw_h = img_h * scale
        
        x = (page_w - draw_w) / 2
        y = (page_h - draw_h) / 2
        
        c.drawImage(img_path, x, y, draw_w, draw_h, preserveAspectRatio=True)
        c.showPage()
    
    c.save()
    return output_path

def main():
    parser = argparse.ArgumentParser(description='Convert images to PDF')
    parser.add_argument('--input', required=True, nargs='+', help='Input image paths')
    parser.add_argument('--output', required=True)
    args = parser.parse_args()
    try:
        result = convert(args.input, args.output)
        print(json.dumps({"success": True, "output": result, "message": "Images converted to PDF successfully"}))
    except Exception as e:
        print(json.dumps({"success": False, "output": "", "message": str(e)}))
        sys.exit(1)

if __name__ == '__main__':
    main()