import unittest
import sys
import tempfile
import time
import threading

from minode import shared
from minode.main import main as app


class TestAppProto(unittest.TestCase):
    """Import and start the application"""
    _process_cmd = ['minode']
    _connection_limit = 4 if sys.platform.startswith('win') else 6
    _listen = False
    _listening_port = None

    home = None

    @classmethod
    def _build_app_args(cls):
        if not cls.home:
            cls.home = tempfile.gettempdir()
        args = cls._process_cmd + [
            '--data-dir', cls.home,
            '--connection-limit', str(cls._connection_limit)
        ]
        if not cls._listen:
            args += ['--no-incoming']
        elif cls._listening_port:
            args += ['-p', str(cls._listening_port)]

        return args

    def _connections(self):
        return [
            c for c in shared.connections if c.status == 'fully_established']

    @classmethod
    def setUpClass(cls):
        sys.argv = cls._build_app_args()
        cls.app = threading.Thread(name="minode", target=app, daemon=True)
        cls.app.start()

    @classmethod
    def tearDownClass(cls):
        shared.shutting_down = True


class TestApp(TestAppProto):
    """Check the app parameters"""
    _wait_time = 120
    _check_limit = True

    def test_connections(self):
        """Check connections"""
        _started = time.time()

        def continue_check_limit(extra_time):
            for t in range(extra_time * 4):
                self.assertLessEqual(
                    len(self._connections()),
                    # shared.outgoing_connections, one listening
                    # TODO: find the cause of one extra
                    (min(self._connection_limit, 8) if not self._listen
                     else self._connection_limit) + 1,
                    'Opened more connections than required'
                    ' by --connection-limit')
                time.sleep(0.5)

        for t in range(self._wait_time * 2):
            if len(self._connections()) > self._connection_limit / 2:
                _time_to_connect = round(time.time() - _started)
                break
            time.sleep(0.5)
        else:
            self.fail(
                'Failed establish at least %s connections in %s sec'
                % (self._connection_limit / 2, self._wait_time))

        if self._check_limit:
            continue_check_limit(_time_to_connect)