#!/usr/bin/env python3
"""
Pre-build script for PlatformIO
Downloads xterm.js files for local hosting (optional)

To use local files instead of CDN, run:
    python scripts/download_xterm.py --local

Then update data/index.html to use local paths instead of CDN URLs.
"""

import os
import sys

# This script runs before build but doesn't do anything by default
# The HTML uses CDN links which work fine when you have internet

def main():
    # Check if --local flag was passed
    if '--local' in sys.argv:
        try:
            import urllib.request
            
            data_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'data')
            js_dir = os.path.join(data_dir, 'js')
            css_dir = os.path.join(data_dir, 'css')
            
            os.makedirs(js_dir, exist_ok=True)
            os.makedirs(css_dir, exist_ok=True)
            
            files = [
                ('https://cdn.jsdelivr.net/npm/xterm@5.3.0/lib/xterm.min.js', 
                 os.path.join(js_dir, 'xterm.min.js')),
                ('https://cdn.jsdelivr.net/npm/xterm@5.3.0/css/xterm.min.css',
                 os.path.join(css_dir, 'xterm.min.css')),
                ('https://cdn.jsdelivr.net/npm/xterm-addon-fit@0.8.0/lib/xterm-addon-fit.min.js',
                 os.path.join(js_dir, 'xterm-addon-fit.min.js')),
                ('https://cdn.jsdelivr.net/npm/xterm-addon-web-links@0.9.0/lib/xterm-addon-web-links.min.js',
                 os.path.join(js_dir, 'xterm-addon-web-links.min.js')),
            ]
            
            for url, path in files:
                if not os.path.exists(path):
                    print(f'Downloading {url}...')
                    urllib.request.urlretrieve(url, path)
                    print(f'  -> {path}')
            
            print('\nLocal files downloaded!')
            print('Update index.html to use local paths:')
            print('  <link rel="stylesheet" href="/css/xterm.min.css">')
            print('  <script src="/js/xterm.min.js"></script>')
            print('  etc.')
            
        except Exception as e:
            print(f'Warning: Could not download xterm.js files: {e}')
            print('The HTML will use CDN links instead.')
    
    # Normal build - do nothing
    pass

if __name__ == '__main__':
    main()