import os
import re
import sys
import socket
import secrets
import tempfile
import http.server
import socketserver

from threading import Thread
from urllib.request import urlopen

PORT = 4040
BEAM_SERVER = '192.168.0.192:4005'

def handler_for_dir(dir):
    def myhandler(*args, **kwargs):
        kwargs['directory'] = dir
        return http.server.SimpleHTTPRequestHandler(*args, **kwargs)

    return myhandler

def get_request(url):
    resp = urlopen(url)
    return (200 <= resp.status <= 299, "\n".join([d.decode() for d in resp.readlines()]))

# get ip address (sourced from https://stackoverflow.com/a/28950776/4141651)
def get_ip():
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        # doesn't even have to be reachable
        s.connect(('10.255.255.255', 1))
        IP = s.getsockname()[0]
    except Exception:
        IP = '127.0.0.1'
    finally:
        s.close()
    return IP

def local_session(target):
    d = tempfile.TemporaryDirectory()
    print("using tempdir " + d.name)

    os.symlink(os.path.abspath(target), d.name  + '/stream')

    handler = handler_for_dir(d.name + '/')
    token = None

    try:
        with http.server.HTTPServer(("0.0.0.0", PORT), handler) as httpd:
            try:
                print("serving at port", PORT)
                t = Thread(target=httpd.serve_forever)
                t.start()
                print("calling beam target...")
                host = get_ip()
                resp = get_request(f'http://{BEAM_SERVER}/open/local?host={host}&port={PORT}')
                if resp[0]:
                    token = resp[1].strip()
                    print(f"successfully started video - session {token}")
                    input("Just press enter when you are done...")
                else:
                    print("Error statrtig video!")
            finally:
                print("shutting down server")
                httpd.shutdown()

    finally:
        print("cleaning up")
        if token:
            get_request(f'http://{BEAM_SERVER}/stop/{token}')
        d.cleanup()

def youtube_session(video):
    id = re.match('^(https?:\/\/)?(www\.)?youtu(\.be\/|be\.com\/watch\?(.*&)?v=)([A-Za-z0-9]{5,20})', video)
    if not id:
        print(f"invalid match in {video}!")
        return
    id = id.group(5)
    
    print(f"watching youtube video {id}")

    resp = get_request(f'http://{BEAM_SERVER}/open/youtube/{id}')

    if resp[0]:
        token = resp[1].strip()
        print(f"successfully started video - session {token}")
        input("Just press enter when you are done...")
        get_request(f'http://{BEAM_SERVER}/stop/{token}')
    else:
        print("Error statrtig video!")


target = sys.argv[1]

if re.match('^(https?:\/\/)?(www\.)?youtu(\.be\/|be\.com\/)', target):
    youtube_session(target)
else:
    local_session(target)

# symlink target to tempdir so we only expose a single file