# Copyright 2016-2019 Camptocamp SA
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)

import logging
import os
import re
from collections import namedtuple

from odoo import api, models
from odoo.tools.config import config

from .strtobool import strtobool

_logger = logging.getLogger(__name__)


def is_true(strval):
    return bool(strtobool(strval or "0"))


PlatformConfig = namedtuple("PlatformConfig", "filestore")


FilestoreKind = namedtuple("FilestoreKind", ["name", "location"])


class CloudPlatform(models.AbstractModel):
    _name = "cloud.platform"
    _description = "cloud.platform"

    @api.model
    def _default_config(self):
        return PlatformConfig(self._filestore_kinds()["db"])

    @api.model
    def _filestore_kinds(self):
        return {
            "db": FilestoreKind("db", "local"),
            "file": FilestoreKind("file", "local"),
        }

    @api.model
    def _platform_kinds(self):
        return []

    @api.model
    def _config_by_server_env(self, platform_kind, environment):
        configs_getter = getattr(
            self, "_config_by_server_env_for_%s" % platform_kind, None
        )
        configs = configs_getter() if configs_getter else {}
        return configs.get(environment) or self._default_config()

    def _get_running_env(self):
        environment_name = config["running_env"]
        if environment_name.startswith("labs"):
            # We allow to have environments such as 'labs-logistics'
            # or 'labs-finance', in order to have the matching ribbon.
            environment_name = "labs"
        return environment_name

    @api.model
    def _install(self, platform_kind):
        assert platform_kind in self._platform_kinds()
        params = self.env["ir.config_parameter"].sudo()
        params.set_param("cloud.platform.kind", platform_kind)
        environment_name = self._get_running_env()
        configs = self._config_by_server_env(platform_kind, environment_name)
        params.set_param("ir_attachment.location", configs.filestore.name)
        self.check()
        if configs.filestore.location == "remote":
            self.env["ir.attachment"].sudo().force_storage()
        _logger.info("cloud platform configured for {}".format(platform_kind))

    @api.model
    def install(self):
        raise NotImplementedError

    @api.model
    def _check_filestore(self, environment_name):
        raise NotImplementedError

    @api.model
    def _check_redis(self, environment_name):
        if environment_name in ("prod", "integration", "labs", "test"):
            assert is_true(os.environ.get("ODOO_SESSION_REDIS")), (
                "Redis must be activated on prod, integration, labs,"
                " test instances. This is done by setting ODOO_SESSION_REDIS=1."
            )
            assert (
                os.environ.get("ODOO_SESSION_REDIS_HOST")
                or os.environ.get("ODOO_SESSION_REDIS_SENTINEL_HOST")
                or os.environ.get("ODOO_SESSION_REDIS_URL")
            ), (
                "ODOO_SESSION_REDIS_HOST or "
                "ODOO_SESSION_REDIS_SENTINEL_HOST or "
                "ODOO_SESSION_REDIS_URL "
                "environment variable is required to connect on Redis"
            )
            assert os.environ.get("ODOO_SESSION_REDIS_PREFIX"), (
                "ODOO_SESSION_REDIS_PREFIX environment variable is required "
                "to store sessions on Redis"
            )

            prefix = os.environ["ODOO_SESSION_REDIS_PREFIX"]
            assert re.match(r"^[a-z-0-9]+-odoo-[a-z-0-9]+$", prefix), (
                "ODOO_SESSION_REDIS_PREFIX must match '<client>-odoo-<env>'"
                ", we got: '%s'" % (prefix,)
            )

    @api.model
    def check(self):
        if is_true(os.environ.get("ODOO_CLOUD_PLATFORM_UNSAFE")):
            _logger.warning("cloud platform checks disabled, this is not safe")
            return
        params = self.env["ir.config_parameter"].sudo()
        kind = params.get_param("cloud.platform.kind")
        if not kind:
            _logger.warning(
                "cloud platform not configured, you should "
                "probably run 'env['cloud.platform'].install()'"
            )
            return
        environment_name = self._get_running_env()
        self._check_filestore(environment_name)
        self._check_redis(environment_name)

    def _register_hook(self):
        super(CloudPlatform, self)._register_hook()
        self.sudo().check()