#!/usr/bin/env python

import base64
import mimetypes
import os.path
import re
import sys

ABSURL_RE = re.compile(r'''^(?:[a-z0-9+.-]+:|/)''')
def repl(func, base):
    def g(m):
        urlstr = m.group(1)
        if urlstr[0] in ('"', "'"):
            urlstr = urlstr[1:-1]
        if ABSURL_RE.match(urlstr):
            return m.group(0)
        try:
            return func(os.path.join(base, urlstr))
        except FileNotFoundError:
            return m.group(0)
    return g

SCRIPT_RE = re.compile(r'''<script src=("[^"]+"|'[^']+')>\s*</script>''')
def scriptrepl(urlstr):
    with open(urlstr, 'r') as f:
        script = f.read()
    if '</script>' in script:
        raise Exception('</script> in script')
    return f'<script>{script}</script>'

CSS_RE = re.compile(r'''<link rel="stylesheet" href=("[^"]+"|'[^']+')>''')
def cssrepl(urlstr):
    with open(urlstr, 'r') as f:
        return '<style>' + f.read() + '</style>'

URL_RE = re.compile(r'''\burl\(("[^"]+"|'[^']+'|[^)]+)\)''')
def urlrepl(urlstr):
    with open(urlstr, 'rb') as f:
        return ('url(data:' + mimetypes.guess_type(urlstr)[0] +
            ';base64,' + base64.b64encode(f.read()).decode('ascii') + ')')

if __name__ == '__main__':
    mimetypes.add_type('font/woff2', '.woff2')
    base = os.path.dirname(sys.argv[1])
    with open(sys.argv[1], 'r') as f:
        buf = f.read()
    buf = SCRIPT_RE.sub(repl(scriptrepl, base), buf)
    buf = CSS_RE.sub(repl(cssrepl, base), buf)
    buf = URL_RE.sub(repl(urlrepl, base), buf)
    sys.stdout.write(buf)