'''
This file is part of tmdb-bot.

tmdb-bot is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General  Public License version 3 as published by
the Free Software Foundation.

tmdb-bot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General  Public License for more details.

You should have received a copy of the GNU Affero General  Public License
along with tmdb-bot.  If not, see <https://www.gnu.org/licenses/>.
'''

from time import time
from sqlalchemy import (Column, String, Integer, Table, MetaData, select, Float)
from sqlalchemy.engine.base import Engine


class Database:
    db: Engine

    def __init__(self, db: Engine) -> None:
        self.db = db
        meta = MetaData()
        meta.bind = db

        self.language = Table("tmdb_language", meta,
                              Column("id", Integer, primary_key=True, autoincrement=True),
                              Column("user_id", String(255), nullable=False),
                              Column("language", String(255), nullable=False),)
        self.tmdb_poster_size = Table("tmdb_poster_size", meta,
                                      Column("id", Integer, primary_key=True, autoincrement=True),
                                      Column("user_id", String(255), nullable=False),
                                      Column("size", String(255), nullable=False),)
        self.tmdb_messages = Table("tmdb_messages", meta,
                                   Column("timestamp", Float, primary_key=True),
                                   Column("event_id", String(64), nullable=False),
                                   Column("result_json", String(255), nullable=False),)
        meta.create_all(db)

    def set_message(self, event_id, result_json):
        with self.db.begin() as tx:
            timestamp = time()
            tx.execute(self.tmdb_messages.insert().values(timestamp=timestamp, event_id=event_id, result_json=result_json))

    def get_message(self, event_id):
        rows = self.db.execute(select([self.tmdb_messages.c.result_json])
                               .where(self.tmdb_messages.c.event_id == event_id))
        row = rows.fetchone()
        if row:
            return row['result_json']
        else:
            return None

    def set_language(self, user_id, language):
        with self.db.begin() as tx:
            tx.execute(self.language.delete().where(self.language.c.user_id == user_id))
            tx.execute(self.language.insert().values(user_id=user_id, language=language))

    def get_language(self, user_id):
        rows = self.db.execute(select([self.language.c.language])
                               .where(self.language.c.user_id == user_id))
        row = rows.fetchone()
        if row:
            return row['language']
        else:
            return None

    def set_poster_size(self, user_id, size):
        with self.db.begin() as tx:
            tx.execute(self.tmdb_poster_size.delete().where(self.tmdb_poster_size.c.user_id == user_id))
            tx.execute(self.tmdb_poster_size.insert().values(user_id=user_id, size=size))

    def get_poster_size(self, user_id):
        rows = self.db.execute(select([self.tmdb_poster_size.c.size])
                               .where(self.tmdb_poster_size.c.user_id == user_id))
        row = rows.fetchone()
        if row:
            return row['size']
        else:
            return None