# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import pytest
import aiohttp
import asyncio
import os
import sys

from tests.utils import asyncio_patch
from pkg_resources import parse_version
from unittest.mock import patch, MagicMock

from gns3server.modules.vpcs.vpcs_vm import VPCSVM
from gns3server.modules.vpcs.vpcs_error import VPCSError
from gns3server.modules.vpcs import VPCS


@pytest.fixture(scope="module")
def manager(port_manager):
    m = VPCS.instance()
    m.port_manager = port_manager
    return m


@pytest.fixture(scope="function")
def vm(project, manager):
    vm = VPCSVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager)
    vm._vpcs_version = parse_version("0.9")
    return vm


def test_vm(project, manager):
    vm = VPCSVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager)
    assert vm.name == "test"
    assert vm.id == "00010203-0405-0607-0809-0a0b0c0d0e0f"


def test_vm_check_vpcs_version(loop, vm, manager):
    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.subprocess_check_output", return_value="Welcome to Virtual PC Simulator, version 0.9"):
        loop.run_until_complete(asyncio.async(vm._check_vpcs_version()))
        assert vm._vpcs_version == parse_version("0.9")


def test_vm_check_vpcs_version_0_6_1(loop, vm, manager):
    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.subprocess_check_output", return_value="Welcome to Virtual PC Simulator, version 0.6.1"):
        loop.run_until_complete(asyncio.async(vm._check_vpcs_version()))
        assert vm._vpcs_version == parse_version("0.6.1")


def test_vm_invalid_vpcs_version(loop, manager, vm):
    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.subprocess_check_output", return_value="Welcome to Virtual PC Simulator, version 0.1"):
        with pytest.raises(VPCSError):
            nio = manager.create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)
            loop.run_until_complete(asyncio.async(vm._check_vpcs_version()))
            assert vm.name == "test"
            assert vm.id == "00010203-0405-0607-0809-0a0b0c0d0e0f"


def test_vm_invalid_vpcs_path(vm, manager, loop):
    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM.vpcs_path", return_value="/tmp/fake/path/vpcs"):
        with pytest.raises(VPCSError):
            nio = manager.create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)
            loop.run_until_complete(asyncio.async(vm.start()))
            assert vm.name == "test"
            assert vm.id == "00010203-0405-0607-0809-0a0b0c0d0e0e"


def test_start(loop, vm):
    process = MagicMock()
    process.returncode = None
    queue = vm.project.get_listen_queue()

    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
        with asyncio_patch("asyncio.create_subprocess_exec", return_value=process) as mock_exec:
            nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)
            loop.run_until_complete(asyncio.async(vm.start()))
            assert mock_exec.call_args[0] == (vm.vpcs_path,
                                              '-p',
                                              str(vm.console),
                                              '-m', '1',
                                              '-i',
                                              '1',
                                              '-F',
                                              '-R',
                                              '-s',
                                              '4242',
                                              '-c',
                                              '4243',
                                              '-t',
                                              '127.0.0.1')
            assert vm.is_running()
    (action, event) = queue.get_nowait()
    assert action == "vm.started"
    assert event == vm


def test_start_0_6_1(loop, vm):
    """
    Version 0.6.1 doesn't have the -R options. It's not require
    because GNS3 provide a patch for this.
    """
    process = MagicMock()
    process.returncode = None
    queue = vm.project.get_listen_queue()
    vm._vpcs_version = parse_version("0.6.1")

    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
        with asyncio_patch("asyncio.create_subprocess_exec", return_value=process) as mock_exec:
            nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)
            loop.run_until_complete(asyncio.async(vm.start()))
            assert mock_exec.call_args[0] == (vm.vpcs_path,
                                              '-p',
                                              str(vm.console),
                                              '-m', '1',
                                              '-i',
                                              '1',
                                              '-F',
                                              '-s',
                                              '4242',
                                              '-c',
                                              '4243',
                                              '-t',
                                              '127.0.0.1')
            assert vm.is_running()
    (action, event) = queue.get_nowait()
    assert action == "vm.started"
    assert event == vm


def test_stop(loop, vm):
    process = MagicMock()

    # Wait process kill success
    future = asyncio.Future()
    future.set_result(True)
    process.wait.return_value = future
    process.returncode = None

    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
        with asyncio_patch("asyncio.create_subprocess_exec", return_value=process):
            nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)

            loop.run_until_complete(asyncio.async(vm.start()))
            assert vm.is_running()

            queue = vm.project.get_listen_queue()

            with asyncio_patch("gns3server.utils.asyncio.wait_for_process_termination"):
                loop.run_until_complete(asyncio.async(vm.stop()))
            assert vm.is_running() is False

            if sys.platform.startswith("win"):
                process.send_signal.assert_called_with(1)
            else:
                process.terminate.assert_called_with()

            (action, event) = queue.get_nowait()
            assert action == "vm.stopped"
            assert event == vm


def test_reload(loop, vm):
    process = MagicMock()

    # Wait process kill success
    future = asyncio.Future()
    future.set_result(True)
    process.wait.return_value = future
    process.returncode = None

    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
        with asyncio_patch("asyncio.create_subprocess_exec", return_value=process):
            nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
            vm.port_add_nio_binding(0, nio)
            loop.run_until_complete(asyncio.async(vm.start()))
            assert vm.is_running()

            with asyncio_patch("gns3server.utils.asyncio.wait_for_process_termination"):
                loop.run_until_complete(asyncio.async(vm.reload()))
            assert vm.is_running() is True

            if sys.platform.startswith("win"):
                process.send_signal.assert_called_with(1)
            else:
                process.terminate.assert_called_with()


def test_add_nio_binding_udp(vm):
    nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
    vm.port_add_nio_binding(0, nio)
    assert nio.lport == 4242


@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_add_nio_binding_tap(vm, ethernet_device):
    with patch("gns3server.modules.base_manager.BaseManager.has_privileged_access", return_value=True):
        nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_tap", "tap_device": ethernet_device})
        vm.port_add_nio_binding(0, nio)
        assert nio.tap_device == ethernet_device


# def test_add_nio_binding_tap_no_privileged_access(vm):
#     with patch("gns3server.modules.base_manager.BaseManager.has_privileged_access", return_value=False):
#         with pytest.raises(aiohttp.web.HTTPForbidden):
#             nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_tap", "tap_device": "test"})
#             vm.port_add_nio_binding(0, nio)
#     assert vm._ethernet_adapter.ports[0] is None
#

def test_port_remove_nio_binding(vm):
    nio = VPCS.instance().create_nio(vm.vpcs_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
    vm.port_add_nio_binding(0, nio)
    vm.port_remove_nio_binding(0)
    assert vm._ethernet_adapter.ports[0] is None


def test_update_startup_script(vm):
    content = "echo GNS3 VPCS\nip 192.168.1.2\n"
    vm.startup_script = content
    filepath = os.path.join(vm.working_dir, 'startup.vpc')
    assert os.path.exists(filepath)
    with open(filepath) as f:
        assert f.read() == content


def test_update_startup_script_h(vm):
    content = "setname %h\n"
    vm.name = "pc1"
    vm.startup_script = content
    assert os.path.exists(vm.script_file)
    with open(vm.script_file) as f:
        assert f.read() == "setname pc1\n"


def test_get_startup_script(vm):
    content = "echo GNS3 VPCS\nip 192.168.1.2"
    vm.startup_script = content
    assert vm.startup_script == os.linesep.join(["echo GNS3 VPCS", "ip 192.168.1.2"])


def test_get_startup_script_using_default_script(vm):
    content = "echo GNS3 VPCS\nip 192.168.1.2\n"

    # Reset script file location
    vm._script_file = None

    filepath = os.path.join(vm.working_dir, 'startup.vpc')
    with open(filepath, 'wb+') as f:
        assert f.write(content.encode("utf-8"))

    assert vm.startup_script == content
    assert vm.script_file == filepath


def test_change_console_port(vm, port_manager):
    port1 = port_manager.get_free_tcp_port(vm.project)
    port2 = port_manager.get_free_tcp_port(vm.project)
    port_manager.release_tcp_port(port1, vm.project)
    port_manager.release_tcp_port(port2, vm.project)
    vm.console = port1
    vm.console = port2
    assert vm.console == port2
    port_manager.reserve_tcp_port(port1, vm.project)


def test_change_name(vm, tmpdir):
    path = os.path.join(vm.working_dir, 'startup.vpc')
    vm.name = "world"
    with open(path, 'w+') as f:
        f.write("name world")
    vm.name = "hello"
    assert vm.name == "hello"
    with open(path) as f:
        assert f.read() == "name hello"


def test_close(vm, port_manager, loop):
    with asyncio_patch("gns3server.modules.vpcs.vpcs_vm.VPCSVM._check_requirements", return_value=True):
        with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()):
            vm.start()
            port = vm.console
            loop.run_until_complete(asyncio.async(vm.close()))
            # Raise an exception if the port is not free
            port_manager.reserve_tcp_port(port, vm.project)
            assert vm.is_running() is False