import pytest
import asyncio
import tempfile
import shutil
import sys
import os

from fastapi import FastAPI
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from asgi_lifespan import LifespanManager
from httpx import AsyncClient
from unittest.mock import MagicMock, patch
from pathlib import Path

from gns3server.controller import Controller
from gns3server.config import Config
from gns3server.compute import MODULES
from gns3server.compute.port_manager import PortManager
from gns3server.compute.project_manager import ProjectManager
from gns3server.db.database import Base

sys._called_from_test = True
sys.original_platform = sys.platform


SQLALCHEMY_DATABASE_URL = "sqlite:///./test.db"

engine = create_async_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)


async def start_db():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)
        await conn.run_sync(Base.metadata.create_all)


if sys.platform.startswith("win") and sys.version_info < (3, 8):
    @pytest.yield_fixture(scope="session")
    def event_loop(request):
        """
        Overwrite pytest_asyncio event loop on Windows for Python < 3.8
        As of Python 3.8, the default event loop on Windows is Proactor
        """

        loop = asyncio.ProactorEventLoop()
        asyncio.set_event_loop(loop)
        yield loop
        asyncio.set_event_loop(None)


# @pytest.mark.asyncio
# @pytest.fixture(scope="session", autouse=True)
# async def database_connection() -> None:
#
#     from gns3server.db.tasks import connect_to_db
#     os.environ["DATABASE_URI"] = "sqlite:///./sql_app_test.db"
#     await connect_to_db()
#     yield


@pytest.fixture#(scope="session")
async def app() -> FastAPI:

    from gns3server.api.server import app as gns3_app
    gns3_app.add_event_handler("startup", start_db())
    return gns3_app


# Grab a reference to our database when needed
#@pytest.fixture
#def db(app: FastAPI) -> Database:
#    return app.state._db

@pytest.fixture
async def client(app: FastAPI) -> AsyncClient:

    #async with LifespanManager(app):
    async with AsyncClient(
            app=app,
            base_url="http://test-api",
            headers={"Content-Type": "application/json"}
    ) as client:
        yield client


@pytest.fixture
def controller_config_path(tmpdir):

    return str(tmpdir / "config" / "gns3_controller.conf")


@pytest.fixture
def controller(tmpdir, controller_config_path):

    Controller._instance = None
    controller = Controller.instance()
    os.makedirs(os.path.dirname(controller_config_path), exist_ok=True)
    Path(controller_config_path).touch()
    controller._config_file = controller_config_path
    controller._config_loaded = True
    return controller


@pytest.fixture
def compute(controller):

    compute = MagicMock()
    compute.id = "example.com"
    controller._computes = {"example.com": compute}
    return compute


@pytest.fixture
@pytest.mark.asyncio
async def project(tmpdir, controller):

    return await controller.add_project(name="Test")


@pytest.fixture
def compute_project(tmpdir):

    return ProjectManager.instance().create_project(project_id="a1e920ca-338a-4e9f-b363-aa607b09dd80")


@pytest.fixture
def config():

    config = Config.instance()
    config.clear()
    return config


@pytest.fixture
def images_dir(config):
    """
    Get the location of images
    """

    path = config.get_section_config("Server").get("images_path")
    os.makedirs(path, exist_ok=True)
    os.makedirs(os.path.join(path, "QEMU"), exist_ok=True)
    os.makedirs(os.path.join(path, "IOU"), exist_ok=True)
    return path


@pytest.fixture
def symbols_dir(config):
    """
    Get the location of symbols
    """

    path = config.get_section_config("Server").get("symbols_path")
    os.makedirs(path, exist_ok=True)
    print(path)
    return path


@pytest.fixture
def projects_dir(config):
    """
    Get the location of images
    """

    path = config.get_section_config("Server").get("projects_path")
    os.makedirs(path, exist_ok=True)
    return path


@pytest.fixture(scope="function")
def port_manager():
    """An instance of port manager"""

    PortManager._instance = None
    p = PortManager.instance()
    p.console_host = "127.0.0.1"
    return p


@pytest.fixture(scope="function")
def free_console_port(port_manager, compute_project):
    """Get a free TCP port"""

    # In case of already use ports we will raise an exception
    port = port_manager.get_free_tcp_port(compute_project)
    # We release the port immediately in order to allow
    # the test do whatever the test want
    port_manager.release_tcp_port(port, compute_project)
    return port


@pytest.fixture
def darwin_platform():
    """
    Change sys.plaform to Darwin
    """

    old_platform = sys.platform
    sys.platform = "darwin10.10"
    yield
    sys.plaform = old_platform


@pytest.fixture
def windows_platform():
    """
    Change sys.platform to Windows
    """

    old_platform = sys.platform
    sys.platform = "win10"
    yield
    sys.plaform = old_platform


@pytest.fixture
def linux_platform():
    """
    Change sys.platform to Linux
    """

    old_platform = sys.platform
    sys.platform = "linuxdebian"
    yield
    sys.plaform = old_platform


@pytest.fixture
def on_gns3vm(linux_platform):
    """
    Mock the hostname to  emulate the GNS3 VM
    """

    with patch("gns3server.utils.interfaces.interfaces", return_value=[
            {"name": "eth0", "special": False, "type": "ethernet"},
            {"name": "eth1", "special": False, "type": "ethernet"},
            {"name": "virbr0", "special": True, "type": "ethernet"}]):
        with patch("socket.gethostname", return_value="gns3vm"):
            yield


@pytest.fixture
def ethernet_device():

    import psutil
    return sorted(psutil.net_if_addrs().keys())[0]


@pytest.fixture
def ubridge_path(config):
    """
    Get the location of a fake ubridge
    """

    path = config.get_section_config("Server").get("ubridge_path")
    os.makedirs(os.path.dirname(path), exist_ok=True)
    open(path, 'w+').close()
    return path


@pytest.fixture(autouse=True)
def run_around_tests(monkeypatch, config, port_manager):#port_manager, controller, config):
    """
    This setup a temporary project file environment around tests
    """

    tmppath = tempfile.mkdtemp()

    for module in MODULES:
        module._instance = None

    os.makedirs(os.path.join(tmppath, 'projects'))
    config.set("Server", "projects_path", os.path.join(tmppath, 'projects'))
    config.set("Server", "symbols_path", os.path.join(tmppath, 'symbols'))
    config.set("Server", "images_path", os.path.join(tmppath, 'images'))
    config.set("Server", "appliances_path", os.path.join(tmppath, 'appliances'))
    config.set("Server", "ubridge_path", os.path.join(tmppath, 'bin', 'ubridge'))
    config.set("Server", "auth", False)
    config.set("Server", "local", True)

    # Prevent executions of the VM if we forgot to mock something
    config.set("VirtualBox", "vboxmanage_path", tmppath)
    config.set("VPCS", "vpcs_path", tmppath)
    config.set("VMware", "vmrun_path", tmppath)
    config.set("Dynamips", "dynamips_path", tmppath)

    # Force turn off KVM because it's not available on CI
    config.set("Qemu", "enable_kvm", False)

    monkeypatch.setattr("gns3server.utils.path.get_default_project_directory", lambda *args: os.path.join(tmppath, 'projects'))

    # Force sys.platform to the original value. Because it seem not be restore correctly at each tests
    sys.platform = sys.original_platform

    yield

    # An helper should not raise Exception
    try:
        shutil.rmtree(tmppath)
    except BaseException:
        pass