import subprocess
from os import listdir, path, makedirs
from os.path import isfile, join, splitext, exists


def main():
    convert_favicon()
    convert_images('public-src', 'public')


def convert_favicon():
    """
    Generate different versions of an icon from a vector image.
    The function does not overwrite existing files.
    """

    root = 'public/favicon'
    src = f'{root}/vector.svg'

    sizes = [512, 192, 180, 32, 16]
    for size in sizes:
        dest = f'{root}/{size}.png'
        if exists(dest):
            continue

        cmd = ['convert', src, '-resize', f'{size}x{size}', f'{root}/{size}.png']
        print(' '.join(cmd))
        subprocess.run(cmd)

    dest = f'{root}/shortcut.ico'
    if exists(dest):
        return

    cmd = [
        'convert', src,
        '(', '-clone', '0', '-resize', '16x16', ')',
        '(', '-clone', '0', '-resize', '32x32', ')',
        '(', '-clone', '0', '-resize', '48x48', ')',
        '-delete', '0', '-alpha', 'remove', '-colors', '256',
        f'{root}/shortcut.ico',
    ]
    print(' '.join(cmd))
    subprocess.run(cmd)


def convert_images(src, dest):
    """
    Convert all images from the public-src directory.
    The function does not overwrite existing files.

    Example:
    public-src/subdir/1.jpg -> public/subdir/1.avif
    """

    for i in listdir(src):
        entry = join(src, i)

        if isfile(entry):
            if splitext(i.lower())[1] not in ['.png', '.jpg', '.jpeg']:
                continue

            dest_file = join(dest, i)
            dest_file = splitext(dest_file)[0] + '.avif'
            if exists(dest_file):
                continue

            cmd = ['convert', entry, '-resize', '1200x', '-quality', '80', dest_file]
            print(' '.join(cmd))
            subprocess.run(cmd)
        else:
            target_dir = join(dest, i)
            makedirs(target_dir, exist_ok=True)
            convert_images(entry, target_dir)


if __name__ == '__main__':
    main()