import os
import pkg_resources
import shutil

import pexpect
import pytest
import sh

from molecule import logger
from molecule import util

from ..conftest import change_dir_to

LOG = logger.get_logger(__name__)

IS_TRAVIS = os.getenv("TRAVIS") and os.getenv("CI")


def _env_vars_exposed(env_vars, env=os.environ):
    """Check if environment variables are exposed and populated."""
    for env_var in env_vars:
        if env_var not in os.environ:
            return False
        return os.environ[env_var] != ""


@pytest.fixture
def with_scenario(request, scenario_to_test, driver_name, scenario_name, skip_test):
    scenario_directory = os.path.join(
        os.path.dirname(util.abs_path(__file__)),
        os.path.pardir,
        "scenarios",
        scenario_to_test,
    )

    with change_dir_to(scenario_directory):
        yield
        if scenario_name:
            msg = "CLEANUP: Destroying instances for all scenario(s)"
            LOG.out(msg)
            options = {"driver_name": driver_name, "all": True}
            cmd = sh.molecule.bake("destroy", **options)
            pytest.helpers.run_command(cmd)


@pytest.fixture
def skip_test(request, driver_name):
    msg_tmpl = (
        "Ignoring '{}' tests for now"
        if driver_name == "delegated"
        else "Skipped '{}' not supported"
    )
    support_checks_map = {
        "hetznercloud": lambda: min_ansible("2.8") and supports_hetznercloud()
    }
    try:
        check_func = support_checks_map[driver_name]
        if not check_func():
            pytest.skip(msg_tmpl.format(driver_name))
    except KeyError:
        pass


@pytest.helpers.register
def idempotence(scenario_name):
    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("create", **options)
    pytest.helpers.run_command(cmd)

    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("converge", **options)
    pytest.helpers.run_command(cmd)

    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("idempotence", **options)
    pytest.helpers.run_command(cmd)


@pytest.helpers.register
def init_role(temp_dir, driver_name):
    role_directory = os.path.join(temp_dir.strpath, "test-init")

    cmd = sh.molecule.bake(
        "init", "role", {"driver-name": driver_name, "role-name": "test-init"}
    )
    pytest.helpers.run_command(cmd)
    pytest.helpers.metadata_lint_update(role_directory)

    with change_dir_to(role_directory):
        options = {"all": True}
        cmd = sh.molecule.bake("test", **options)
        pytest.helpers.run_command(cmd)


@pytest.helpers.register
def init_scenario(temp_dir, driver_name):
    role_directory = os.path.join(temp_dir.strpath, "test-init")
    cmd = sh.molecule.bake(
        "init", "role", {"driver-name": driver_name, "role-name": "test-init"}
    )
    pytest.helpers.run_command(cmd)
    pytest.helpers.metadata_lint_update(role_directory)

    with change_dir_to(role_directory):
        molecule_directory = pytest.helpers.molecule_directory()
        scenario_directory = os.path.join(molecule_directory, "test-scenario")

        options = {"scenario_name": "test-scenario", "role_name": "test-init"}
        cmd = sh.molecule.bake("init", "scenario", **options)
        pytest.helpers.run_command(cmd)

        assert os.path.isdir(scenario_directory)

        options = {"scenario_name": "test-scenario", "all": True}
        cmd = sh.molecule.bake("test", **options)
        pytest.helpers.run_command(cmd)


@pytest.helpers.register
def metadata_lint_update(role_directory):
    ansible_lint_src = os.path.join(
        os.path.dirname(util.abs_path(__file__)), ".ansible-lint"
    )

    shutil.copy(ansible_lint_src, role_directory)

    with change_dir_to(role_directory):
        cmd = sh.ansible_lint.bake(".")
    pytest.helpers.run_command(cmd)


@pytest.helpers.register
def list(x):
    cmd = sh.molecule.bake("list")
    out = pytest.helpers.run_command(cmd, log=False)
    out = out.stdout.decode("utf-8")
    out = util.strip_ansi_color(out)

    for l in x.splitlines():
        assert l in out


@pytest.helpers.register
def list_with_format_plain(x):
    cmd = sh.molecule.bake("list", {"format": "plain"})
    out = pytest.helpers.run_command(cmd, log=False)
    out = out.stdout.decode("utf-8")
    out = util.strip_ansi_color(out)

    for l in x.splitlines():
        assert l in out


@pytest.helpers.register
def login(login_args, scenario_name="default"):
    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("destroy", **options)
    pytest.helpers.run_command(cmd)

    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("create", **options)
    pytest.helpers.run_command(cmd)

    for instance, regexp in login_args:
        if len(login_args) > 1:
            child_cmd = "molecule login --host {} --scenario-name {}".format(
                instance, scenario_name
            )
        else:
            child_cmd = "molecule login --scenario-name {}".format(scenario_name)
        child = pexpect.spawn(child_cmd)
        child.expect(regexp)
        child.sendline("exit")


@pytest.helpers.register
def test(driver_name, scenario_name="default", parallel=False):
    options = {
        "scenario_name": scenario_name,
        "all": scenario_name is None,
        "parallel": parallel,
    }

    if driver_name == "delegated":
        options = {"scenario_name": scenario_name}

    cmd = sh.molecule.bake("test", **options)
    pytest.helpers.run_command(cmd)


@pytest.helpers.register
def verify(scenario_name="default"):
    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("create", **options)
    pytest.helpers.run_command(cmd)

    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("converge", **options)
    pytest.helpers.run_command(cmd)

    options = {"scenario_name": scenario_name}
    cmd = sh.molecule.bake("verify", **options)
    pytest.helpers.run_command(cmd)


def min_ansible(version):
    """Ensure current Ansible is newer than a given a minimal one."""
    try:
        from ansible.release import __version__

        return pkg_resources.parse_version(__version__) >= pkg_resources.parse_version(
            version
        )
    except ImportError as exception:
        LOG.error("Unable to parse Ansible version", exc_info=exception)
        return False


@pytest.helpers.register
def supports_hetznercloud():
    pytest.importorskip("hcloud")

    env_vars = ("HCLOUD_TOKEN",)

    return _env_vars_exposed(env_vars)