"""Test Home Assistant package util methods."""
import asyncio
import logging
import os
import sys
from subprocess import PIPE
from unittest.mock import MagicMock, call, patch

import pkg_resources
import pytest

import homeassistant.util.package as package


RESOURCE_DIR = os.path.abspath(
    os.path.join(os.path.dirname(__file__), "..", "resources")
)

TEST_NEW_REQ = "pyhelloworld3==1.0.0"

TEST_ZIP_REQ = "file://{}#{}".format(
    os.path.join(RESOURCE_DIR, "pyhelloworld3.zip"), TEST_NEW_REQ
)


@pytest.fixture
def mock_sys():
    """Mock sys."""
    with patch("homeassistant.util.package.sys", spec=object) as sys_mock:
        sys_mock.executable = "python3"
        yield sys_mock


@pytest.fixture
def deps_dir():
    """Return path to deps directory."""
    return os.path.abspath("/deps_dir")


@pytest.fixture
def lib_dir(deps_dir):
    """Return path to lib directory."""
    return os.path.join(deps_dir, "lib_dir")


@pytest.fixture
def mock_popen(lib_dir):
    """Return a Popen mock."""
    with patch("homeassistant.util.package.Popen") as popen_mock:
        popen_mock.return_value.communicate.return_value = (
            bytes(lib_dir, "utf-8"),
            b"error",
        )
        popen_mock.return_value.returncode = 0
        yield popen_mock


@pytest.fixture
def mock_env_copy():
    """Mock os.environ.copy."""
    with patch("homeassistant.util.package.os.environ.copy") as env_copy:
        env_copy.return_value = {}
        yield env_copy


@pytest.fixture
def mock_venv():
    """Mock homeassistant.util.package.is_virtual_env."""
    with patch("homeassistant.util.package.is_virtual_env") as mock:
        mock.return_value = True
        yield mock


@asyncio.coroutine
def mock_async_subprocess():
    """Return an async Popen mock."""
    async_popen = MagicMock()

    @asyncio.coroutine
    def communicate(input=None):
        """Communicate mock."""
        stdout = bytes("/deps_dir/lib_dir", "utf-8")
        return (stdout, None)

    async_popen.communicate = communicate
    return async_popen


def test_install(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test an install attempt on a package that doesn't exist."""
    env = mock_env_copy()
    assert package.install_package(TEST_NEW_REQ, False)
    assert mock_popen.call_count == 1
    assert mock_popen.call_args == call(
        [mock_sys.executable, "-m", "pip", "install", "--quiet", TEST_NEW_REQ],
        stdin=PIPE,
        stdout=PIPE,
        stderr=PIPE,
        env=env,
    )
    assert mock_popen.return_value.communicate.call_count == 1


def test_install_upgrade(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test an upgrade attempt on a package."""
    env = mock_env_copy()
    assert package.install_package(TEST_NEW_REQ)
    assert mock_popen.call_count == 1
    assert mock_popen.call_args == call(
        [
            mock_sys.executable,
            "-m",
            "pip",
            "install",
            "--quiet",
            TEST_NEW_REQ,
            "--upgrade",
        ],
        stdin=PIPE,
        stdout=PIPE,
        stderr=PIPE,
        env=env,
    )
    assert mock_popen.return_value.communicate.call_count == 1


def test_install_target(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test an install with a target."""
    target = "target_folder"
    env = mock_env_copy()
    env["PYTHONUSERBASE"] = os.path.abspath(target)
    mock_venv.return_value = False
    mock_sys.platform = "linux"
    args = [
        mock_sys.executable,
        "-m",
        "pip",
        "install",
        "--quiet",
        TEST_NEW_REQ,
        "--user",
        "--prefix=",
    ]

    assert package.install_package(TEST_NEW_REQ, False, target=target)
    assert mock_popen.call_count == 1
    assert mock_popen.call_args == call(
        args, stdin=PIPE, stdout=PIPE, stderr=PIPE, env=env
    )
    assert mock_popen.return_value.communicate.call_count == 1


def test_install_target_venv(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test an install with a target in a virtual environment."""
    target = "target_folder"
    with pytest.raises(AssertionError):
        package.install_package(TEST_NEW_REQ, False, target=target)


def test_install_error(caplog, mock_sys, mock_popen, mock_venv):
    """Test an install with a target."""
    caplog.set_level(logging.WARNING)
    mock_popen.return_value.returncode = 1
    assert not package.install_package(TEST_NEW_REQ)
    assert len(caplog.records) == 1
    for record in caplog.records:
        assert record.levelname == "ERROR"


def test_install_constraint(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test install with constraint file on not installed package."""
    env = mock_env_copy()
    constraints = "constraints_file.txt"
    assert package.install_package(TEST_NEW_REQ, False, constraints=constraints)
    assert mock_popen.call_count == 1
    assert mock_popen.call_args == call(
        [
            mock_sys.executable,
            "-m",
            "pip",
            "install",
            "--quiet",
            TEST_NEW_REQ,
            "--constraint",
            constraints,
        ],
        stdin=PIPE,
        stdout=PIPE,
        stderr=PIPE,
        env=env,
    )
    assert mock_popen.return_value.communicate.call_count == 1


def test_install_find_links(mock_sys, mock_popen, mock_env_copy, mock_venv):
    """Test install with find-links on not installed package."""
    env = mock_env_copy()
    link = "https://wheels-repository"
    assert package.install_package(TEST_NEW_REQ, False, find_links=link)
    assert mock_popen.call_count == 1
    assert mock_popen.call_args == call(
        [
            mock_sys.executable,
            "-m",
            "pip",
            "install",
            "--quiet",
            TEST_NEW_REQ,
            "--find-links",
            link,
            "--prefer-binary",
        ],
        stdin=PIPE,
        stdout=PIPE,
        stderr=PIPE,
        env=env,
    )
    assert mock_popen.return_value.communicate.call_count == 1


@asyncio.coroutine
def test_async_get_user_site(mock_env_copy):
    """Test async get user site directory."""
    deps_dir = "/deps_dir"
    env = mock_env_copy()
    env["PYTHONUSERBASE"] = os.path.abspath(deps_dir)
    args = [sys.executable, "-m", "site", "--user-site"]
    with patch(
        "homeassistant.util.package.asyncio.create_subprocess_exec",
        return_value=mock_async_subprocess(),
    ) as popen_mock:
        ret = yield from package.async_get_user_site(deps_dir)
    assert popen_mock.call_count == 1
    assert popen_mock.call_args == call(
        *args,
        stdin=asyncio.subprocess.PIPE,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.DEVNULL,
        env=env,
    )
    assert ret == os.path.join(deps_dir, "lib_dir")


def test_check_package_global():
    """Test for an installed package."""
    installed_package = list(pkg_resources.working_set)[0].project_name
    assert package.is_installed(installed_package)


def test_check_package_zip():
    """Test for an installed zip package."""
    assert not package.is_installed(TEST_ZIP_REQ)
