"""
MIT License

Copyright (c) 2022 Aʙɪsʜɴᴏɪ

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import threading

from sqlalchemy import Column, String, UnicodeText, distinct, func

from Database.sql import BASE, SESSION


class Disable(BASE):
    __tablename__ = "disabled_commands"
    chat_id = Column(String(14), primary_key=True)
    command = Column(UnicodeText, primary_key=True)

    def __init__(self, chat_id, command):
        self.chat_id = chat_id
        self.command = command

    def __repr__(self):
        return "ᴅɪsᴀʙʟᴇᴅ ᴄᴍᴅ {} in {}".format(self.command, self.chat_id)


Disable.__table__.create(checkfirst=True)
DISABLE_INSERTION_LOCK = threading.RLock()

DISABLED = {}


def disable_command(chat_id, disable):
    with DISABLE_INSERTION_LOCK:
        disabled = SESSION.query(Disable).get((str(chat_id), disable))

        if not disabled:
            DISABLED.setdefault(str(chat_id), set()).add(disable)

            disabled = Disable(str(chat_id), disable)
            SESSION.add(disabled)
            SESSION.commit()
            return True

        SESSION.close()
        return False


def enable_command(chat_id, enable):
    with DISABLE_INSERTION_LOCK:
        disabled = SESSION.query(Disable).get((str(chat_id), enable))

        if disabled:
            if enable in DISABLED.get(str(chat_id)):  # sanity check
                DISABLED.setdefault(str(chat_id), set()).remove(enable)

            SESSION.delete(disabled)
            SESSION.commit()
            return True

        SESSION.close()
        return False


def is_command_disabled(chat_id, cmd):
    return str(cmd).lower() in DISABLED.get(str(chat_id), set())


def get_all_disabled(chat_id):
    return DISABLED.get(str(chat_id), set())


def num_chats():
    try:
        return SESSION.query(func.count(distinct(Disable.chat_id))).scalar()
    finally:
        SESSION.close()


def num_disabled():
    try:
        return SESSION.query(Disable).count()
    finally:
        SESSION.close()


def migrate_chat(old_chat_id, new_chat_id):
    with DISABLE_INSERTION_LOCK:
        chats = SESSION.query(Disable).filter(Disable.chat_id == str(old_chat_id)).all()
        for chat in chats:
            chat.chat_id = str(new_chat_id)
            SESSION.add(chat)

        if str(old_chat_id) in DISABLED:
            DISABLED[str(new_chat_id)] = DISABLED.get(str(old_chat_id), set())

        SESSION.commit()


def __load_disabled_commands():
    global DISABLED
    try:
        all_chats = SESSION.query(Disable).all()
        for chat in all_chats:
            DISABLED.setdefault(chat.chat_id, set()).add(chat.command)

    finally:
        SESSION.close()


__load_disabled_commands()