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

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

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):
        """ 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.proxy = "socks5://127.0.0.1:{}".format(self.socks_port)
        self.session = 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 create_session(self):
        conn = ProxyConnector(remote_resolve=True)
        return aiohttp.ClientSession(
            connector=conn,
            request_class=ProxyClientRequest
        )

    async def query(self, url):
        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 i in range(3):
        a = await TorInstance.create(None)
        output = await a.query("https://python.org/")
        print("One page received")
        await a.kill()

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