#!/usr/bin/env python3
"""
Create minimal placeholder PNG icons using only standard library.
These are simple solid-color squares that Firefox will accept.
"""

import struct
import zlib
from pathlib import Path

def create_png(width, height, rgb_color):
    """Create a minimal PNG file with a solid color."""
    r, g, b = rgb_color

    def png_chunk(chunk_type, data):
        """Create a PNG chunk with CRC."""
        chunk = chunk_type + data
        crc = zlib.crc32(chunk) & 0xffffffff
        return struct.pack('>I', len(data)) + chunk + struct.pack('>I', crc)

    # PNG signature
    signature = b'\x89PNG\r\n\x1a\n'

    # IHDR chunk (image header)
    ihdr_data = struct.pack('>IIBBBBB', width, height, 8, 2, 0, 0, 0)
    ihdr = png_chunk(b'IHDR', ihdr_data)

    # IDAT chunk (image data)
    # Create raw pixel data: each row starts with filter byte 0, then RGB pixels
    raw_data = b''
    for y in range(height):
        raw_data += b'\x00'  # Filter byte (none)
        for x in range(width):
            raw_data += bytes([r, g, b])

    compressed = zlib.compress(raw_data, 9)
    idat = png_chunk(b'IDAT', compressed)

    # IEND chunk
    iend = png_chunk(b'IEND', b'')

    return signature + ihdr + idat + iend

def main():
    icons_dir = Path(__file__).parent / 'icons'
    icons_dir.mkdir(exist_ok=True)

    # Primary blue color (#1976d2)
    color = (25, 118, 210)

    sizes = [16, 32, 48, 128]

    for size in sizes:
        png_data = create_png(size, size, color)
        output_path = icons_dir / f'icon-{size}.png'
        with open(output_path, 'wb') as f:
            f.write(png_data)
        print(f'Created {output_path} ({len(png_data)} bytes)')

    print('\nPlaceholder icons created!')
    print('Replace with custom icons for a better look.')

if __name__ == '__main__':
    main()