# -*- coding: utf-8 -*-
# Copyright 2014, 2015 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from ._base import Config
import os
import yaml


class DatabaseConfig(Config):
    def __init__(self, args):
        super(DatabaseConfig, self).__init__(args)
        if args.database_path == ":memory:":
            self.database_path = ":memory:"
        else:
            self.database_path = self.abspath(args.database_path)
        self.event_cache_size = self.parse_size(args.event_cache_size)

        if args.database_config:
            with open(args.database_config) as f:
                self.database_config = yaml.safe_load(f)
        else:
            self.database_config = {
                "name": "sqlite3",
                "args": {
                    "database": self.database_path,
                },
            }

        name = self.database_config.get("name", None)
        if name == "psycopg2":
            pass
        elif name == "sqlite3":
            self.database_config.setdefault("args", {}).update({
                "cp_min": 1,
                "cp_max": 1,
                "check_same_thread": False,
            })
        else:
            raise RuntimeError("Unsupported database type '%s'" % (name,))

    @classmethod
    def add_arguments(cls, parser):
        super(DatabaseConfig, cls).add_arguments(parser)
        db_group = parser.add_argument_group("database")
        db_group.add_argument(
            "-d", "--database-path", default="homeserver.db",
            metavar="SQLITE_DATABASE_PATH", help="The database name."
        )
        db_group.add_argument(
            "--event-cache-size", default="100K",
            help="Number of events to cache in memory."
        )
        db_group.add_argument(
            "--database-config", default=None,
            help="Location of the database configuration file."
        )

    @classmethod
    def generate_config(cls, args, config_dir_path):
        super(DatabaseConfig, cls).generate_config(args, config_dir_path)
        args.database_path = os.path.abspath(args.database_path)