#  Copyright (c) 2015-2018 Cisco Systems, Inc.
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#  The above copyright notice and this permission notice shall be included in
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#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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"""Config Module."""

import copy
import functools
import logging
import os
from typing import Callable, MutableMapping, TypeVar
from uuid import uuid4

from packaging.version import Version

from molecule import api, interpolation, platforms, scenario, state, util
from molecule.constants import RC_SETUP_ERROR
from molecule.dependency import ansible_galaxy, shell
from molecule.model import schema_v3
from molecule.provisioner import ansible
from molecule.util import boolean, lru_cache, run_command, sysexit

LOG = logging.getLogger(__name__)
MOLECULE_DEBUG = boolean(os.environ.get("MOLECULE_DEBUG", "False"))
MOLECULE_VERBOSITY = int(os.environ.get("MOLECULE_VERBOSITY", 0))
MOLECULE_DIRECTORY = "molecule"
MOLECULE_FILE = "molecule.yml"
MOLECULE_KEEP_STRING = "MOLECULE_"
DEFAULT_DRIVER = "delegated"

T = TypeVar("T")


# see https://github.com/python/mypy/issues/5858
def cache(func: Callable[..., T]) -> T:
    """Decorate properties to cache them."""
    return functools.lru_cache()(func)  # type: ignore


# https://stackoverflow.com/questions/16017397/injecting-function-call-after-init-with-decorator  # noqa
class NewInitCaller(type):
    """NewInitCaller."""

    def __call__(cls, *args, **kwargs):
        obj = type.__call__(cls, *args, **kwargs)
        obj.after_init()
        return obj


class Config(object, metaclass=NewInitCaller):
    """
    Config Class.

    Molecule searches the current directory for ``molecule.yml`` files by
    globbing `molecule/*/molecule.yml`.  The files are instantiated into
    a list of Molecule :class:`.Config` objects, and each Molecule subcommand
    operates on this list.

    The directory in which the ``molecule.yml`` resides is the Scenario's
    directory.  Molecule performs most functions within this directory.

    The :class:`.Config` object instantiates Dependency_, Driver_,
    :ref:`lint`, Platforms_, Provisioner_, Verifier_,
    :ref:`root_scenario`, and State_ references.
    """

    # pylint: disable=too-many-instance-attributes
    # Config objects should be allowed to have any number of attributes
    def __init__(self, molecule_file: str, args={}, command_args={}, ansible_args=()):
        """
        Initialize a new config class and returns None.

        :param molecule_file: A string containing the path to the Molecule file
         to be parsed.
        :param args: An optional dict of options, arguments and commands from
         the CLI.
        :param command_args: An optional dict of options passed to the
         subcommand from the CLI.
        :param ansible_args: An optional tuple of arguments provided to the
         ``ansible-playbook`` command.
        :returns: None
        """
        self.molecule_file = molecule_file
        self.args = args
        self.command_args = command_args
        self.ansible_args = ansible_args
        self.config = self._get_config()
        self._action = None
        self._run_uuid = str(uuid4())
        self.project_directory = os.getenv("MOLECULE_PROJECT_DIRECTORY", os.getcwd())

    def after_init(self):
        self.config = self._reget_config()
        if self.molecule_file:
            self._validate()

    def write(self) -> None:
        util.write_file(self.config_file, util.safe_dump(self.config))

    @property
    def ansible_collections_path(self):
        """Return collection path variable for current version of Ansible."""
        # https://github.com/ansible/ansible/pull/70007
        if ansible_version() >= ansible_version("2.10.0.dev0"):
            return "ANSIBLE_COLLECTIONS_PATH"
        else:
            return "ANSIBLE_COLLECTIONS_PATHS"

    @property
    def config_file(self):
        return os.path.join(self.scenario.ephemeral_directory, MOLECULE_FILE)

    @property
    def is_parallel(self):
        return self.command_args.get("parallel", False)

    @property
    def debug(self):
        return self.args.get("debug", MOLECULE_DEBUG)

    @property
    def env_file(self):
        return util.abs_path(self.args.get("env_file"))

    @property
    def subcommand(self):
        return self.command_args["subcommand"]

    @property
    def action(self):
        return self._action

    @action.setter
    def action(self, value):
        self._action = value

    @property
    def cache_directory(self):
        return "molecule_parallel" if self.is_parallel else "molecule"

    @property
    def molecule_directory(self):
        return molecule_directory(self.project_directory)

    @property  # type: ignore  # see https://github.com/python/mypy/issues/1362
    @util.lru_cache()
    def dependency(self):
        dependency_name = self.config["dependency"]["name"]
        if dependency_name == "galaxy":
            return ansible_galaxy.AnsibleGalaxy(self)
        elif dependency_name == "shell":
            return shell.Shell(self)

    @property  # type: ignore
    @util.lru_cache()
    def driver(self):
        driver_name = self._get_driver_name()
        driver = None

        driver = api.drivers(config=self)[driver_name]
        driver.name = driver_name

        return driver

    @property  # type: ignore
    def env(self):
        return {
            "MOLECULE_DEBUG": str(self.debug),
            "MOLECULE_FILE": self.config_file,
            "MOLECULE_ENV_FILE": str(self.env_file),
            "MOLECULE_STATE_FILE": self.state.state_file,
            "MOLECULE_INVENTORY_FILE": self.provisioner.inventory_file,
            "MOLECULE_EPHEMERAL_DIRECTORY": self.scenario.ephemeral_directory,
            "MOLECULE_SCENARIO_DIRECTORY": self.scenario.directory,
            "MOLECULE_PROJECT_DIRECTORY": self.project_directory,
            "MOLECULE_INSTANCE_CONFIG": self.driver.instance_config,
            "MOLECULE_DEPENDENCY_NAME": self.dependency.name,
            "MOLECULE_DRIVER_NAME": self.driver.name,
            "MOLECULE_PROVISIONER_NAME": self.provisioner.name,
            "MOLECULE_SCENARIO_NAME": self.scenario.name,
            "MOLECULE_VERIFIER_NAME": self.verifier.name,
            "MOLECULE_VERIFIER_TEST_DIRECTORY": self.verifier.directory,
        }

    @property  # type: ignore
    @util.lru_cache()
    def lint(self):
        lint_name = self.config.get("lint", None)
        return lint_name

    @property  # type: ignore
    @util.lru_cache()
    def platforms(self):
        return platforms.Platforms(self, parallelize_platforms=self.is_parallel)

    @property  # type: ignore
    @cache
    def provisioner(self):
        provisioner_name = self.config["provisioner"]["name"]
        if provisioner_name == "ansible":
            return ansible.Ansible(self)

    @property  # type: ignore
    @util.lru_cache()
    def scenario(self):
        return scenario.Scenario(self)

    @property  # type: ignore
    @util.lru_cache()
    def state(self):
        return state.State(self)

    @property  # type: ignore
    @util.lru_cache()
    def verifier(self):
        return api.verifiers(self).get(self.config["verifier"]["name"], None)

    def _get_driver_name(self):
        driver_from_state_file = self.state.driver
        driver_from_cli = self.command_args.get("driver_name")

        if driver_from_state_file:
            driver_name = driver_from_state_file
        elif driver_from_cli:
            driver_name = driver_from_cli
        else:
            driver_name = self.config["driver"]["name"]

        if driver_from_cli and (driver_from_cli != driver_name):
            msg = (
                "Instance(s) were created with the '{}' driver, but the "
                "subcommand is using '{}' driver."
            ).format(driver_name, driver_from_cli)
            util.sysexit_with_message(msg)

        return driver_name

    def _get_config(self) -> MutableMapping:
        """
        Perform a prioritized recursive merge of config files.

        Returns a new dict.  Prior to merging the config files are interpolated with
        environment variables.

        :return: dict
        """
        return self._combine(keep_string=MOLECULE_KEEP_STRING)

    def _reget_config(self):
        """
        Perform the same prioritized recursive merge from `get_config`.

        Interpolates the ``keep_string`` left behind in the original
        ``get_config`` call.  This is probably __very__ bad.

        :return: dict
        """
        env = util.merge_dicts(os.environ, self.env)
        env = set_env_from_file(env, self.env_file)

        return self._combine(env=env)

    def _combine(self, env=os.environ, keep_string=None) -> MutableMapping:
        """
        Perform a prioritized recursive merge of config files.

        Returns a new dict.  Prior to merging the config files are interpolated with
        environment variables.

        1. Loads Molecule defaults.
        2. Loads a base config (if provided) and merges ontop of defaults.
        3. Loads the scenario's ``molecule file`` and merges ontop of previous
           merge.

        :return: dict
        """
        defaults = self._get_defaults()
        base_configs = filter(os.path.exists, self.args.get("base_config", []))
        for base_config in base_configs:
            with util.open_file(base_config) as stream:
                s = stream.read()
                self._preflight(s)
                interpolated_config = self._interpolate(s, env, keep_string)
                defaults = util.merge_dicts(
                    defaults, util.safe_load(interpolated_config)
                )

        if self.molecule_file:
            with util.open_file(self.molecule_file) as stream:
                s = stream.read()
                self._preflight(s)
                interpolated_config = self._interpolate(s, env, keep_string)
                defaults = util.merge_dicts(
                    defaults, util.safe_load(interpolated_config)
                )

        return defaults

    def _interpolate(self, stream: str, env: MutableMapping, keep_string: str) -> str:
        env = set_env_from_file(env, self.env_file)

        i = interpolation.Interpolator(interpolation.TemplateWithDefaults, env)

        try:
            return i.interpolate(stream, keep_string)
        except interpolation.InvalidInterpolation as e:
            msg = "parsing config file '{}'.\n\n" "{}\n{}".format(
                self.molecule_file, e.place, e.string
            )
            util.sysexit_with_message(msg)
        return ""

    def _get_defaults(self) -> MutableMapping:
        if not self.molecule_file:
            scenario_name = "default"
        else:
            scenario_name = (
                os.path.basename(os.path.dirname(self.molecule_file)) or "default"
            )
        return {
            "dependency": {
                "name": "galaxy",
                "command": None,
                "enabled": True,
                "options": {},
                "env": {},
            },
            "driver": {
                "name": "delegated",
                "provider": {"name": None},
                "options": {"managed": True},
                "ssh_connection_options": [],
                "safe_files": [],
            },
            "platforms": [],
            "provisioner": {
                "name": "ansible",
                "config_options": {},
                "ansible_args": [],
                "connection_options": {},
                "options": {},
                "env": {},
                "inventory": {
                    "hosts": {},
                    "host_vars": {},
                    "group_vars": {},
                    "links": {},
                },
                "children": {},
                "playbooks": {
                    "cleanup": "cleanup.yml",
                    "create": "create.yml",
                    "converge": "converge.yml",
                    "destroy": "destroy.yml",
                    "prepare": "prepare.yml",
                    "side_effect": "side_effect.yml",
                    "verify": "verify.yml",
                },
                "log": True,
            },
            "scenario": {
                "name": scenario_name,
                "check_sequence": [
                    "dependency",
                    "cleanup",
                    "destroy",
                    "create",
                    "prepare",
                    "converge",
                    "check",
                    "cleanup",
                    "destroy",
                ],
                "cleanup_sequence": ["cleanup"],
                "converge_sequence": ["dependency", "create", "prepare", "converge"],
                "create_sequence": ["dependency", "create", "prepare"],
                "destroy_sequence": ["dependency", "cleanup", "destroy"],
                "test_sequence": [
                    # dependency must be kept before lint to avoid errors
                    "dependency",
                    "lint",
                    "cleanup",
                    "destroy",
                    "syntax",
                    "create",
                    "prepare",
                    "converge",
                    "idempotence",
                    "side_effect",
                    "verify",
                    "cleanup",
                    "destroy",
                ],
            },
            "verifier": {
                "name": "ansible",
                "enabled": True,
                "options": {},
                "env": {},
                "additional_files_or_dirs": [],
            },
        }

    def _preflight(self, data: MutableMapping):
        env = set_env_from_file(os.environ.copy(), self.env_file)
        errors, data = schema_v3.pre_validate(data, env, MOLECULE_KEEP_STRING)
        if errors:
            msg = "Failed to pre-validate.\n\n{}".format(errors)
            util.sysexit_with_message(msg, detail=data)

    def _validate(self):
        msg = "Validating schema {}.".format(self.molecule_file)
        LOG.debug(msg)

        errors = schema_v3.validate(self.config)
        if errors:
            msg = f"Failed to validate {self.molecule_file}\n\n{errors}"
            util.sysexit_with_message(msg)


def molecule_directory(path):
    """Return directory of the current scenario."""
    return os.path.join(path, MOLECULE_DIRECTORY)


def molecule_file(path):
    """Return file path of current scenario."""
    return os.path.join(path, MOLECULE_FILE)


def set_env_from_file(env: MutableMapping[str, str], env_file: str) -> MutableMapping:
    """Load environment from file."""
    if env_file and os.path.exists(env_file):
        env = copy.copy(env)
        d = util.safe_load_file(env_file)
        for k, v in d.items():
            env[k] = v

        return env

    return env


@lru_cache()
def ansible_version(version: str = "") -> Version:
    """Return current Version object for Ansible.

    If version is not mentioned, it returns current version as detected.
    When version argument is mentioned, it return converts the version string
    to Version object in order to make it usable in comparisons.
    """
    if not version:
        proc = run_command(["ansible", "--version"], quiet=True)
        if proc.returncode != 0:
            LOG.fatal(
                "Unable to find a working copy of ansible executable. Read https://molecule.readthedocs.io/en/latest/installation.html\n%s",
                proc,
            )
            sysexit(RC_SETUP_ERROR)

        # First line of the `ansible --version` output is:
        #
        #  1. `ansible <version>` on ansible < 2.10 and on ansible-base.
        #  2. `ansible [core <version>]` on ansible-core.
        #
        # The code below grabs the last component in that line and strips trailing ] if
        # present.
        version = proc.stdout.splitlines()[0].split()[-1].rstrip("]")

    return Version(version)