#
# Copyright (c) 2021, Andreas Botzner <andreas at botzner dot com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

from ansible.module_utils.basic import missing_required_lib

import traceback

REDIS_IMP_ERR = None
try:
    from redis import Redis
    from redis import __version__ as redis_version

    HAS_REDIS_PACKAGE = True
    REDIS_IMP_ERR = None
except ImportError:
    REDIS_IMP_ERR = traceback.format_exc()
    HAS_REDIS_PACKAGE = False

try:
    import certifi

    HAS_CERTIFI_PACKAGE = True
    CERTIFI_IMPORT_ERROR = None
except ImportError:
    CERTIFI_IMPORT_ERROR = traceback.format_exc()
    HAS_CERTIFI_PACKAGE = False


def fail_imports(module, needs_certifi=True):
    errors = []
    traceback = []
    if not HAS_REDIS_PACKAGE:
        errors.append(missing_required_lib("redis"))
        traceback.append(REDIS_IMP_ERR)
    if not HAS_CERTIFI_PACKAGE and needs_certifi:
        errors.append(missing_required_lib("certifi"))
        traceback.append(CERTIFI_IMPORT_ERROR)
    if errors:
        module.fail_json(msg="\n".join(errors), traceback="\n".join(traceback))


def redis_auth_argument_spec(tls_default=True):
    return dict(
        login_host=dict(
            type="str",
            default="localhost",
        ),
        login_user=dict(type="str"),
        login_password=dict(type="str", no_log=True),
        login_port=dict(type="int", default=6379),
        tls=dict(type="bool", default=tls_default),
        validate_certs=dict(type="bool", default=True),
        ca_certs=dict(type="str"),
        client_cert_file=dict(type="str"),
        client_key_file=dict(type="str"),
    )


def redis_auth_params(module):
    login_host = module.params["login_host"]
    login_user = module.params["login_user"]
    login_password = module.params["login_password"]
    login_port = module.params["login_port"]
    tls = module.params["tls"]
    validate_certs = "required" if module.params["validate_certs"] else None
    ca_certs = module.params["ca_certs"]
    if tls and ca_certs is None:
        ca_certs = str(certifi.where())
    client_cert_file = module.params["client_cert_file"]
    client_key_file = module.params["client_key_file"]
    if tuple(map(int, redis_version.split("."))) < (3, 4, 0) and login_user is not None:
        module.fail_json(msg="The option `username` in only supported with redis >= 3.4.0.")
    params = {
        "host": login_host,
        "port": login_port,
        "password": login_password,
        "ssl_ca_certs": ca_certs,
        "ssl_certfile": client_cert_file,
        "ssl_keyfile": client_key_file,
        "ssl_cert_reqs": validate_certs,
        "ssl": tls,
    }
    if login_user is not None:
        params["username"] = login_user
    return params


class RedisAnsible:
    """Base class for Redis module"""

    def __init__(self, module):
        self.module = module
        self.connection = self._connect()

    def _connect(self):
        try:
            return Redis(**redis_auth_params(self.module))
        except Exception as e:
            self.module.fail_json(msg=f"{e}")
        return None