from gevent import monkey
monkey.patch_all()
import gevent.socket

from youtube import yt_app
from youtube import util

# these are just so the files get run - they import yt_app and add routes to it
from youtube import watch

import settings

from gevent.pywsgi import WSGIServer
import urllib
import urllib3
import socket
import socks, sockshandler
import subprocess
import re




def youtu_be(env, start_response):
    id = env['PATH_INFO'][1:]
    env['PATH_INFO'] = '/watch'
    env['QUERY_STRING'] = 'v=' + id
    yield from yt_app(env, start_response)

def proxy_site(env, start_response):
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64)',
        'Accept': '*/*',
    }
    url = "https://" + env['SERVER_NAME'] + env['PATH_INFO']
    if env['QUERY_STRING']:
        url += '?' + env['QUERY_STRING']


    content, response = util.fetch_url(url, headers, return_response=True)

    headers = response.getheaders()
    if isinstance(headers, urllib3._collections.HTTPHeaderDict):
        headers = headers.items()

    start_response('200 OK', headers )
    yield content

site_handlers = {
    'youtube.com':yt_app,
    'youtu.be':youtu_be,
    'ytimg.com': proxy_site,
    'yt3.ggpht.com': proxy_site,
    'lh3.googleusercontent.com': proxy_site,

}

def split_url(url):
    ''' Split https://sub.example.com/foo/bar.html into ('sub.example.com', '/foo/bar.html')'''
    # XXX: Is this regex safe from REDOS?
    # python STILL doesn't have a proper regular expression engine like grep uses built in...
    match = re.match(r'(?:https?://)?([\w-]+(?:\.[\w-]+)+?)(/.*|$)', url)
    if match is None:
        raise ValueError('Invalid or unsupported url: ' + url)
    
    return match.group(1), match.group(2)
    


def error_code(code, start_response):
    start_response(code, ())
    return code.encode()

def site_dispatch(env, start_response):
    client_address = env['REMOTE_ADDR']
    try:
        method = env['REQUEST_METHOD']
        path = env['PATH_INFO']

        if method=="POST" and client_address not in ('127.0.0.1', '::1'):
            yield error_code('403 Forbidden', start_response)
            return

        try:
            env['SERVER_NAME'], env['PATH_INFO'] = split_url(path[1:])
        except ValueError:
            yield error_code('404 Not Found', start_response)
            return

        base_name = ''
        for domain in reversed(env['SERVER_NAME'].split('.')):
            if base_name == '':
                base_name = domain
            else:
                base_name = domain + '.' + base_name

            try:
                handler = site_handlers[base_name]
            except KeyError:
                continue
            else:
                yield from handler(env, start_response)
                break
        else:   # did not break
            yield error_code('404 Not Found', start_response)
            return
        '''
    except http_errors.Code200 as e:    # Raised in scenarios where a simple status message is to be returned, such as a terminated channel
        start_response('200 OK', ())
        yield str(e).encode('utf-8')

    except http_errors.Error404 as e:
        start_response('404 Not Found', ())
        yield str(e).encode('utf-8')

    except urllib.error.HTTPError as e:
        start_response(str(e.code) + ' ' + e.reason, ())
        yield b'While fetching url, the following error occured:\n' + str(e).encode('utf-8')

    except socket.error as e:
        start_response('502 Bad Gateway', ())
        print(str(e))
        yield b'502 Bad Gateway'
        '''
    except Exception:
        start_response('500 Internal Server Error', ())
        yield b'500 Internal Server Error'
        raise
    return





if settings.allow_foreign_addresses:
    server = WSGIServer(('0.0.0.0', settings.port_number), site_dispatch)
else:
    server = WSGIServer(('127.0.0.1', settings.port_number), site_dispatch)
print('Started httpserver on port ' , settings.port_number)
server.serve_forever()