# -*- 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
import stat
import re
from tests.utils import asyncio_patch


from unittest import mock
from unittest.mock import patch, MagicMock

from gns3server.modules.qemu.qemu_vm import QemuVM
from gns3server.modules.qemu.qemu_error import QemuError
from gns3server.modules.qemu import Qemu
from gns3server.utils import force_unix_path


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


@pytest.fixture
def fake_qemu_img_binary():

    bin_path = os.path.join(os.environ["PATH"], "qemu-img")
    with open(bin_path, "w+") as f:
        f.write("1")
    os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
    return bin_path


@pytest.fixture
def fake_qemu_binary():

    if sys.platform.startswith("win"):
        bin_path = os.path.join(os.environ["PATH"], "qemu-system-x86_64.EXE")
    else:
        bin_path = os.path.join(os.environ["PATH"], "qemu-system-x86_64")
    with open(bin_path, "w+") as f:
        f.write("1")
    os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
    return bin_path


@pytest.fixture(scope="function")
def vm(project, manager, fake_qemu_binary, fake_qemu_img_binary):
    manager.port_manager.console_host = "127.0.0.1"
    vm = QemuVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager, qemu_path=fake_qemu_binary)
    vm._process_priority = "normal"  # Avoid complexity for Windows tests
    return vm


@pytest.fixture(scope="function")
def running_subprocess_mock():
    mm = MagicMock()
    mm.returncode = None
    return mm


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


def test_is_running(vm, running_subprocess_mock):

    vm._process = None
    assert vm.is_running() is False
    vm._process = running_subprocess_mock
    assert vm.is_running()
    vm._process.returncode = -1
    assert vm.is_running() is False


def test_start(loop, vm, running_subprocess_mock):
    with asyncio_patch("asyncio.create_subprocess_exec", return_value=running_subprocess_mock):
        loop.run_until_complete(asyncio.async(vm.start()))
        assert vm.is_running()


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

    # Wait process kill success
    future = asyncio.Future()
    future.set_result(True)
    process.wait.return_value = future

    with asyncio_patch("asyncio.create_subprocess_exec", return_value=process):
        nio = Qemu.instance().create_nio(vm.qemu_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
        vm.adapter_add_nio_binding(0, nio)
        loop.run_until_complete(asyncio.async(vm.start()))
        assert vm.is_running()
        loop.run_until_complete(asyncio.async(vm.stop()))
        assert vm.is_running() is False
        process.terminate.assert_called_with()


def test_termination_callback(vm):

    vm.status = "started"
    queue = vm.project.get_listen_queue()

    vm._termination_callback(0)
    assert vm.status == "stopped"

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

    with pytest.raises(asyncio.queues.QueueEmpty):
        queue.get_nowait()


def test_termination_callback_error(vm, tmpdir):

    with open(str(tmpdir / "qemu.log"), "w+") as f:
        f.write("BOOMM")

    vm.status = "started"
    vm._stdout_file = str(tmpdir / "qemu.log")
    queue = vm.project.get_listen_queue()

    vm._termination_callback(1)
    assert vm.status == "stopped"

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

    (action, event) = queue.get_nowait()
    assert action == "log.error"
    assert event["message"] == "QEMU process has stopped, return code: 1\nBOOMM"


def test_reload(loop, vm):

    with asyncio_patch("gns3server.modules.qemu.QemuVM._control_vm") as mock:
        loop.run_until_complete(asyncio.async(vm.reload()))
        assert mock.called_with("system_reset")


def test_suspend(loop, vm):

    control_vm_result = MagicMock()
    control_vm_result.match.group.decode.return_value = "running"
    with asyncio_patch("gns3server.modules.qemu.QemuVM._control_vm", return_value=control_vm_result) as mock:
        loop.run_until_complete(asyncio.async(vm.suspend()))
        assert mock.called_with("system_reset")


def test_add_nio_binding_udp(vm, loop):
    nio = Qemu.instance().create_nio(vm.qemu_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
    loop.run_until_complete(asyncio.async(vm.adapter_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_ethernet(vm, loop, ethernet_device):
    with patch("gns3server.modules.base_manager.BaseManager.has_privileged_access", return_value=True):
        nio = Qemu.instance().create_nio(vm.qemu_path, {"type": "nio_generic_ethernet", "ethernet_device": ethernet_device})
        loop.run_until_complete(asyncio.async(vm.adapter_add_nio_binding(0, nio)))
        assert nio.ethernet_device == ethernet_device


def test_port_remove_nio_binding(vm, loop):
    nio = Qemu.instance().create_nio(vm.qemu_path, {"type": "nio_udp", "lport": 4242, "rport": 4243, "rhost": "127.0.0.1"})
    loop.run_until_complete(asyncio.async(vm.adapter_add_nio_binding(0, nio)))
    loop.run_until_complete(asyncio.async(vm.adapter_remove_nio_binding(0)))
    assert vm._ethernet_adapters[0].ports[0] is None


def test_close(vm, port_manager, loop):
    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()):
        loop.run_until_complete(asyncio.async(vm.start()))

        console_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(console_port, vm.project)

        assert vm.is_running() is False


def test_set_qemu_path(vm, tmpdir, fake_qemu_binary):

    # Raise because none
    with pytest.raises(QemuError):
        vm.qemu_path = None

    # Should not crash with unicode characters
    path = str(tmpdir / "\u62FF" / "qemu-system-mips")

    os.makedirs(str(tmpdir / "\u62FF"))

    # Raise because file doesn't exists
    with pytest.raises(QemuError):
        vm.qemu_path = path

    with open(path, "w+") as f:
        f.write("1")

    # Raise because file is not executable
    if not sys.platform.startswith("win"):
        with pytest.raises(QemuError):
            vm.qemu_path = path

    os.chmod(path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)

    vm.qemu_path = path
    assert vm.qemu_path == path
    assert vm.platform == "mips"


def test_set_qemu_path_environ(vm, tmpdir, fake_qemu_binary):

    # It should find the binary in the path
    vm.qemu_path = "qemu-system-x86_64"

    assert vm.qemu_path == fake_qemu_binary
    assert vm.platform == "x86_64"


def test_set_qemu_path_windows(vm, tmpdir):

    bin_path = os.path.join(os.environ["PATH"], "qemu-system-x86_64w.EXE")
    open(bin_path, "w+").close()
    os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)

    vm.qemu_path = bin_path

    assert vm.qemu_path == bin_path
    assert vm.platform == "x86_64"


def test_set_qemu_path_old_windows(vm, tmpdir):

    bin_path = os.path.join(os.environ["PATH"], "qemu.exe")
    open(bin_path, "w+").close()
    os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)

    vm.qemu_path = bin_path

    assert vm.qemu_path == bin_path
    assert vm.platform == "i386"



@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_set_qemu_path_kvm_binary(vm, tmpdir, fake_qemu_binary):

    bin_path = os.path.join(os.environ["PATH"], "qemu-kvm")
    with open(bin_path, "w+") as f:
        f.write("1")
    os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)

    # It should find the binary in the path
    vm.qemu_path = "qemu-kvm"

    assert vm.qemu_path.endswith("qemu-kvm")
    assert vm.platform == "x86_64"


def test_set_platform(project, manager):

    with patch("shutil.which", return_value="/bin/qemu-system-x86_64") as which_mock:
        with patch("gns3server.modules.qemu.QemuVM._check_qemu_path"):
            vm = QemuVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager, platform="x86_64")
            if sys.platform.startswith("win"):
                which_mock.assert_called_with("qemu-system-x86_64w.exe", path=mock.ANY)
            else:
                which_mock.assert_called_with("qemu-system-x86_64", path=mock.ANY)
    assert vm.platform == "x86_64"
    assert vm.qemu_path == "/bin/qemu-system-x86_64"


def test_disk_options(vm, tmpdir, loop, fake_qemu_img_binary):

    vm._hda_disk_image = str(tmpdir / "test.qcow2")
    open(vm._hda_disk_image, "w+").close()

    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
        loop.run_until_complete(asyncio.async(vm._disk_options()))
        assert process.called
        args, kwargs = process.call_args
        assert args == (fake_qemu_img_binary, "create", "-o", "backing_file={}".format(vm._hda_disk_image), "-f", "qcow2", os.path.join(vm.working_dir, "hda_disk.qcow2"))


@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_set_process_priority(vm, loop, fake_qemu_img_binary):

    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
        vm._process = MagicMock()
        vm._process.pid = 42
        vm._process_priority = "low"
        loop.run_until_complete(asyncio.async(vm._set_process_priority()))
        assert process.called
        args, kwargs = process.call_args
        assert args == ("renice", "-n", "5", "-p", "42")


@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_set_process_priority_normal(vm, loop, fake_qemu_img_binary):

    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
        vm._process = MagicMock()
        vm._process.pid = 42
        loop.run_until_complete(asyncio.async(vm._set_process_priority()))
        assert not process.called


def test_json(vm, project):

    json = vm.__json__()
    assert json["name"] == vm.name
    assert json["project_id"] == project.id


def test_control_vm(vm, loop):

    vm._process = MagicMock()
    reader = MagicMock()
    writer = MagicMock()
    with asyncio_patch("asyncio.open_connection", return_value=(reader, writer)) as open_connect:
        res = loop.run_until_complete(asyncio.async(vm._control_vm("test")))
        assert writer.write.called_with("test")
    assert res is None


def test_control_vm_expect_text(vm, loop, running_subprocess_mock):

    vm._process = running_subprocess_mock
    reader = MagicMock()
    writer = MagicMock()
    with asyncio_patch("asyncio.open_connection", return_value=(reader, writer)) as open_connect:

        future = asyncio.Future()
        future.set_result(b"epic product")
        reader.readline.return_value = future

        vm._monitor = 4242
        res = loop.run_until_complete(asyncio.async(vm._control_vm("test", [b"epic"])))
        assert writer.write.called_with("test")

    assert res == "epic product"


def test_build_command(vm, loop, fake_qemu_binary, port_manager):

    os.environ["DISPLAY"] = "0:0"
    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))
        assert cmd == [
            fake_qemu_binary,
            "-name",
            "test",
            "-m",
            "256M",
            "-smp",
            "cpus=1",
            "-boot",
            "order=c",
            "-serial",
            "telnet:127.0.0.1:{},server,nowait".format(vm.console),
            "-net",
            "none",
            "-device",
            "e1000,mac=00:00:ab:0e:0f:00"
        ]


@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_build_command_without_display(vm, loop, fake_qemu_binary):

    os.environ["DISPLAY"] = ""
    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))
        assert "-nographic" in cmd


# Windows accept this kind of mistake
@pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
def test_build_command_with_invalid_options(vm, loop, fake_qemu_binary):

    vm.options = "'test"
    with pytest.raises(QemuError):
        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))


def test_hda_disk_image(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    vm.hda_disk_image = str(tmpdir / "test")
    assert vm.hda_disk_image == force_unix_path(str(tmpdir / "test"))
    vm.hda_disk_image = "test"
    assert vm.hda_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test"))


def test_hda_disk_image_ova(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    vm.hda_disk_image = "test.ovf/test.vmdk"
    assert vm.hda_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test.ovf" / "test.vmdk"))


def test_hdb_disk_image(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    vm.hdb_disk_image = str(tmpdir / "test")
    assert vm.hdb_disk_image == force_unix_path(str(tmpdir / "test"))
    vm.hdb_disk_image = "test"
    assert vm.hdb_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test"))


def test_hdc_disk_image(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    vm.hdc_disk_image = str(tmpdir / "test")
    assert vm.hdc_disk_image == force_unix_path(str(tmpdir / "test"))
    vm.hdc_disk_image = "test"
    assert vm.hdc_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test"))


def test_hdd_disk_image(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    vm.hdd_disk_image = str(tmpdir / "test")
    assert vm.hdd_disk_image == force_unix_path(str(tmpdir / "test"))
    vm.hdd_disk_image = "test"
    assert vm.hdd_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test"))


def test_initrd(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    with patch("gns3server.modules.project.Project.emit") as mock:
        vm.initrd = str(tmpdir / "test")
        assert vm.initrd == force_unix_path(str(tmpdir / "test"))
        vm.initrd = "test"
        assert vm.initrd == force_unix_path(str(tmpdir / "QEMU" / "test"))
        assert not mock.called


def test_initrd_asa(vm, tmpdir):

    vm.manager.config.set("Server", "images_path", str(tmpdir))

    with patch("gns3server.modules.project.Project.emit") as mock:
        vm.initrd = str(tmpdir / "asa842-initrd.gz")
        assert vm.initrd == force_unix_path(str(tmpdir / "asa842-initrd.gz"))
        vm.initrd = "asa842-initrd.gz"
        assert vm.initrd == force_unix_path(str(tmpdir / "QEMU" / "asa842-initrd.gz"))
        assert mock.called


def test_options(linux_platform, vm):
    vm.kvm = False
    vm.options = "-usb"
    assert vm.options == "-usb"
    assert vm.kvm is False

    vm.options = "-no-kvm"
    assert vm.options == "-no-kvm"

    vm.options = "-enable-kvm"
    assert vm.options == "-enable-kvm"

    vm.options = "-icount 12"
    assert vm.options == "-no-kvm -icount 12"

    vm.options = "-icount 12 -no-kvm"
    assert vm.options == "-icount 12 -no-kvm"


def test_options_windows(windows_platform, vm):
    vm.options = "-no-kvm"
    assert vm.options == ""

    vm.options = "-enable-kvm"
    assert vm.options == ""


def test_get_qemu_img(vm, tmpdir):

    open(str(tmpdir / "qemu-sytem-x86_64"), "w+").close()
    open(str(tmpdir / "qemu-img"), "w+").close()
    vm._qemu_path = str(tmpdir / "qemu-sytem-x86_64")
    assert vm._get_qemu_img() == str(tmpdir / "qemu-img")


def test_get_qemu_img_not_exist(vm, tmpdir):

    open(str(tmpdir / "qemu-sytem-x86_64"), "w+").close()
    vm._qemu_path = str(tmpdir / "qemu-sytem-x86_64")
    with pytest.raises(QemuError):
        vm._get_qemu_img()


def test_run_with_kvm_darwin(darwin_platform, vm):

    vm.manager.config.set("Qemu", "enable_kvm", False)
    assert vm._run_with_kvm("qemu-system-x86_64", "") is False


def test_run_with_kvm_windows(windows_platform, vm):

    vm.manager.config.set("Qemu", "enable_kvm", False)
    assert vm._run_with_kvm("qemu-system-x86_64.exe", "") is False


def test_run_with_kvm_linux(linux_platform, vm):

    with patch("os.path.exists", return_value=True) as os_path:
        vm.manager.config.set("Qemu", "enable_kvm", True)
        assert vm._run_with_kvm("qemu-system-x86_64", "") is True
        os_path.assert_called_with("/dev/kvm")


def test_run_with_kvm_linux_options_no_kvm(linux_platform, vm):

    with patch("os.path.exists", return_value=True) as os_path:
        vm.manager.config.set("Qemu", "enable_kvm", True)
        assert vm._run_with_kvm("qemu-system-x86_64", "-no-kvm") is False


def test_run_with_kvm_not_x86(linux_platform, vm):

    with patch("os.path.exists", return_value=True) as os_path:
        vm.manager.config.set("Qemu", "enable_kvm", True)
        assert vm._run_with_kvm("qemu-system-arm", "") is False


def test_run_with_kvm_linux_dev_kvm_missing(linux_platform, vm):

    with patch("os.path.exists", return_value=False) as os_path:
        vm.manager.config.set("Qemu", "enable_kvm", True)
        with pytest.raises(QemuError):
            vm._run_with_kvm("qemu-system-x86_64", "")