"""Blind tests, starting the minode process"""
import os
import signal
import socket
import subprocess
import sys
import tempfile
import time
import unittest

import psutil

from minode.i2p import util
from minode.structure import NetAddrNoPrefix

try:
    socket.socket().bind(('127.0.0.1', 7656))
    i2p_port_free = True
except (OSError, socket.error):
    i2p_port_free = False


class TestProcessProto(unittest.TestCase):
    """Test process attributes, common flow"""
    _process_cmd = ['minode']
    _connection_limit = 4 if sys.platform.startswith('win') else 8
    _listen = False
    _listening_port = None

    home = None

    @classmethod
    def setUpClass(cls):
        if not cls.home:
            cls.home = tempfile.gettempdir()
        cmd = cls._process_cmd + [
            '--data-dir', cls.home,
            '--connection-limit', str(cls._connection_limit)
        ]
        if not cls._listen:
            cmd += ['--no-incoming']
        elif cls._listening_port:
            cmd += ['-p', str(cls._listening_port)]
        cls.process = psutil.Popen(cmd, stderr=subprocess.STDOUT)  # nosec

    @classmethod
    def _stop_process(cls, timeout=5):
        cls.process.send_signal(signal.SIGTERM)
        try:
            cls.process.wait(timeout)
        except psutil.TimeoutExpired:
            return False
        return True

    @classmethod
    def tearDownClass(cls):
        """Ensures that process stopped and removes files"""
        try:
            if not cls._stop_process(10):
                try:
                    cls.process.kill()
                except psutil.NoSuchProcess:
                    pass
        except psutil.NoSuchProcess:
            pass

    def connections(self):
        """All process' established connections"""
        return [
            c for c in self.process.connections()
            if c.status == 'ESTABLISHED']


class TestProcessShutdown(TestProcessProto):
    """Separate test case for SIGTERM"""
    _wait_time = 30
    # longer wait time because it's not a benchmark

    def test_shutdown(self):
        """Send to minode SIGTERM and ensure it stopped"""
        self.assertTrue(
            self._stop_process(self._wait_time),
            '%s has not stopped in %i sec' % (
                ' '.join(self._process_cmd), self._wait_time))


class TestProcess(TestProcessProto):
    """The test case for minode process"""
    _wait_time = 180
    _check_limit = False

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

        def continue_check_limit(extra_time):
            for _ in range(extra_time * 2):
                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(1)

        for _ in range(self._wait_time * 2):
            if len(self.connections()) >= self._connection_limit / 2:
                _time_to_connect = round(time.time() - _started)
                break
            if '--i2p' not in self._process_cmd:
                groups = []
                for c in self.connections():
                    group = NetAddrNoPrefix.network_group(c.raddr[0])
                    self.assertNotIn(group, groups)
                    groups.append(group)
            time.sleep(0.5)
        else:
            self.fail(
                'Failed to establish at least %i connections in %s sec'
                % (int(self._connection_limit / 2), self._wait_time))

        if self._check_limit:
            continue_check_limit(_time_to_connect)

        for c in self.process.connections():
            if c.status == 'LISTEN':
                if self._listen is False:
                    self.fail('Listening while started with --no-incoming')
                    return
                self.assertEqual(c.laddr[1], self._listening_port or 8444)
                break
        else:
            if self._listen:
                self.fail('No listening connection found')


@unittest.skipIf(i2p_port_free, 'No running i2pd detected')
class TestProcessI2P(TestProcess):
    """Test minode process with --i2p and no IP"""
    _process_cmd = ['minode', '--i2p', '--no-ip']
    _listen = True
    _listening_port = 8448

    @classmethod
    def setUpClass(cls):
        cls.freezed = False
        cls.keyfile = os.path.join(cls.home, 'i2p_dest.pub')
        saved = os.path.isfile(cls.keyfile)
        super().setUpClass()
        for _ in range(cls._wait_time):
            if saved:
                if cls.process.num_threads() > 3:
                    break
            elif os.path.isfile(cls.keyfile):
                break
            time.sleep(1)
        else:
            cls.freezed = True

    def setUp(self):
        """Skip any test if I2PController freezed"""
        if self.freezed:
            raise unittest.SkipTest(
                'I2PController has probably failed to start')

    def test_saved_keys(self):
        """Check saved i2p keys"""
        with open(self.keyfile, 'br') as src:
            i2p_dest_pub = src.read()
        with open(os.path.join(self.home, 'i2p_dest_priv.key'), 'br') as src:
            i2p_dest_priv = src.read()
        self.assertEqual(util.pub_from_priv(i2p_dest_priv), i2p_dest_pub)

    def test_connections(self):
        """Ensure all connections are I2P"""
        super().test_connections()
        for c in self.connections():
            self.assertEqual(c.raddr[0], '127.0.0.1')
            self.assertEqual(c.raddr[1], 7656)


@unittest.skipUnless(i2p_port_free, 'Detected running i2pd')
class TestProcessNoI2P(TestProcessShutdown):
    """Test minode process shutdown with --i2p and no IP"""
    _process_cmd = ['minode', '--i2p', '--no-ip']