#!/usr/bin/env python3
import subprocess
import os

# Test PDF to TIFF-F conversion
pdf_path = "/Users/accusys/telfax/test/testfax.pdf"
tiff_path = "/Users/accusys/telfax/test/testfax_converted.tif"

print("=== Testing PDF → TIFF-F Conversion ===")

# Run ghostscript
result = subprocess.run([
    "gs", "-dBATCH", "-dNOPAUSE", "-q",
    "-sDEVICE=tiffg3",
    "-r204x196",  # Fine resolution
    "-sOutputFile", tiff_path,
    pdf_path
], capture_output=True, text=True)

if result.returncode != 0:
    print(f"Ghostscript failed: {result.stderr}")
    exit(1)

# Check output
if os.path.exists(tiff_path):
    size = os.path.getsize(tiff_path)
    print(f"✓ TIFF-F created: {tiff_path}")
    print(f"  Size: {size} bytes")
    
    # Get TIFF info
    import struct
    
    with open(tiff_path, 'rb') as f:
        header = f.read(8)
        if header[:2] == b'II':
            print("  Byte order: Little-endian")
        elif header[:2] == b'MM':
            print("  Byte order: Big-endian")
        
        # Read IFD offset
        if header[:2] == b'II':
            ifd_offset = struct.unpack('<I', header[4:8])[0]
        else:
            ifd_offset = struct.unpack('>I', header[4:8])[0]
        
        f.seek(ifd_offset)
        num_entries = struct.unpack('<H' if header[:2] == b'II' else '>H', f.read(2))[0]
        print(f"  IFD entries: {num_entries}")
        
        # Read key tags
        for i in range(num_entries):
            tag = struct.unpack('<H' if header[:2] == b'II' else '>H', f.read(2))[0]
            type_ = struct.unpack('<H' if header[:2] == b'II' else '>H', f.read(2))[0]
            count = struct.unpack('<I' if header[:2] == b'II' else '>I', f.read(4))[0]
            value_offset = f.read(4)
            
            # Tags of interest: 256=width, 257=height, 259=compression, 262=photometric
            if tag == 256:  # Width
                val = struct.unpack('<I' if header[:2] == b'II' else '>I', value_offset)[0]
                print(f"  Width: {val} pixels")
            elif tag == 257:  # Height
                val = struct.unpack('<I' if header[:2] == b'II' else '>I', value_offset)[0]
                print(f"  Height: {val} lines")
            elif tag == 259:  # Compression
                val = struct.unpack('<H' if header[:2] == b'II' else '>H', value_offset[:2])[0]
                comp_names = {1: "None", 3: "Group 3 MH", 4: "Group 4 MMR"}
                print(f"  Compression: {comp_names.get(val, val)}")
            elif tag == 262:  # PhotometricInterpretation
                val = struct.unpack('<H' if header[:2] == b'II' else '>H', value_offset[:2])[0]
                photo_names = {0: "WhiteIsZero", 1: "BlackIsZero"}
                print(f"  Photometric: {photo_names.get(val, val)}")
else:
    print("✗ TIFF-F not created")
    exit(1)

print("\n=== Conversion Test Passed ===")