import json
import os
import shutil
import subprocess

def main():
    print('=> rebuilding wasm')
    subprocess.check_call(['wasm-pack', 'build', '--target', 'web'])
    os.makedirs('out', exist_ok=True)
    build_index()
    print('=> moving wasm output')
    for root, _, files in os.walk('pkg'):
        for f in files:
            shutil.copy(
                os.path.join(root, f),
                os.path.join('out', f)
            )

def build_index():
    print('=> building index.html')
    sources = {}
    for root, _, files in os.walk("examples"):
        for f in files:
            if not f.endswith(".matzo"):
                continue

            with open(os.path.join(root, f)) as s:
                sources[f.removesuffix(".matzo")] = s.read()

    with open('index.html') as f:
        template = f.read()

    examples = '\n'.join((
        f'<option value="{s}">{s}.matzo</option>'
        for s in sorted(sources.keys())
        if s != 'hello'
    ))

    template = (template
                .replace('%SOURCES%', json.dumps(sources))
                .replace('%EXAMPLES%', examples))

    with open(os.path.join('out', 'index.html'), 'w') as f:
        f.write(template)

if __name__ == '__main__':
    main()