"""
Modules that handles tor instaces creations in order to safely run histories
"""

import shutil
import asyncio
import aiohttp
from aiosocks.connector import ProxyConnector, ProxyClientRequest
from time import sleep
import async_timeout
import stem.process as tor

class TorInstance():
    """
    A tor instance object, with some useful information.
    It is designed to be used as a worker in order to replay an history.
    """
    BASE_SOCKS_PORT = 40000
    BASE_CONTROL_PORT = 20000
    BASE_DATA_DIR = "/tmp/tor{}/"
    TOR_RUNNER = 0

    @classmethod
    async def create(cls, history, headers):
        """ Factory creation of tor processes"""
        socks_port = cls.BASE_SOCKS_PORT + cls.TOR_RUNNER
        control_port = cls.BASE_CONTROL_PORT + cls.TOR_RUNNER
        data_dir = cls.BASE_DATA_DIR.format(cls.TOR_RUNNER)
        TorInstance.TOR_RUNNER += 1
        self = TorInstance()
        self.socks_port = socks_port
        self.control_port = control_port
        self.data_dir = data_dir
        self.history = history
        self.headers = headers
        self.proxy = "socks5://127.0.0.1:{}".format(self.socks_port)
        self.create_session()
        self.process = tor.launch_tor_with_config(
            config={
                'ControlPort' : str(control_port),
                'SocksPort' : str(socks_port),
                'DataDir' : data_dir
            }
        )
        return self

    def __init__(self):
        self.socks_port = 0
        self.control_port = 0
        self.data_dir = ""
        self.history = None
        self.proxy = ""
        self.headers = {}
        self.session = None
        self.process = None

    async def run(self):
        """ Runs the Tor Instance on the history.
        """
        t_start = time.now()
        while history:
            item = history.pop(0)
            async with async_timeout.timeout(30):
                await(self.query(item[0]))
                t_end = time.now()
                diff = (history[0][1] - item[0]) - (t_end - t_start)
                if diff > 0:
                    sleep(diff)


    def create_session(self):
        """ Create a aiohttp session.
        """
        conn = ProxyConnector(remote_resolve=True)
        self.session = aiohttp.ClientSession(
            connector=conn,
            headers=self.headers,
            request_class=ProxyClientRequest
        )


    async def query(self, url):
        """ Performs a query.
        """
        async with async_timeout.timeout(30):
            async with self.session.get(
                url,
                proxy=self.proxy,
                proxy_auth=None) as resp:
                try:
                    return await resp.text()
                except UnicodeDecodeError:
                    return None


    def __str__(self):
        """ Utility function """
        return ('[TOR] SOCKSPort: {0.socks_port}, ControlPort: '
                '{0.control_port}, DataDir: {0.data_dir}'.format(self))

    async def kill(self):
        """ Kills the process and remove the data dir"""
        self.process.kill()
        self.session.close()
        shutil.rmtree(self.data_dir)


async def main():
    """ Test function """
    for _ in range(3):
        instance = await TorInstance.create(None, {"user-agent" : "Blah"})
        await instance.query("https://python.org/")
        print("One page received")
        await instance.kill()

if __name__ == "__main__":
    LOOP = asyncio.get_event_loop()
    LOOP.run_until_complete(main())