"""
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 BigInteger, Column, String, UnicodeText, distinct, func

from Database.sql import BASE, SESSION


class BlackListFilters(BASE):
    __tablename__ = "blacklist"
    chat_id = Column(String(14), primary_key=True)
    trigger = Column(UnicodeText, primary_key=True, nullable=False)

    def __init__(self, chat_id, trigger):
        self.chat_id = str(chat_id)  # ensure string
        self.trigger = trigger

    def __repr__(self):
        return "<ʙʟᴀᴄᴋʟɪsᴛ ғɪʟᴛᴇʀ '%s' ғᴏʀ %s>" % (self.trigger, self.chat_id)

    def __eq__(self, other):
        return bool(
            isinstance(other, BlackListFilters)
            and self.chat_id == other.chat_id
            and self.trigger == other.trigger,
        )


class BlacklistSettings(BASE):
    __tablename__ = "blacklist_settings"
    chat_id = Column(String(14), primary_key=True)
    blacklist_type = Column(BigInteger, default=1)
    value = Column(UnicodeText, default="0")

    def __init__(self, chat_id, blacklist_type=1, value="0"):
        self.chat_id = str(chat_id)
        self.blacklist_type = blacklist_type
        self.value = value

    def __repr__(self):
        return "<{} ᴡɪʟʟ ᴇxᴇᴄᴜᴛɪɴɢ {} ғᴏʀ ʙʟᴀᴄᴋʟɪsᴛ ᴛʀɪɢɢᴇʀ.>".format(
            self.chat_id,
            self.blacklist_type,
        )


BlackListFilters.__table__.create(checkfirst=True)
BlacklistSettings.__table__.create(checkfirst=True)

BLACKLIST_FILTER_INSERTION_LOCK = threading.RLock()
BLACKLIST_SETTINGS_INSERTION_LOCK = threading.RLock()

CHAT_BLACKLISTS = {}
CHAT_SETTINGS_BLACKLISTS = {}


def add_to_blacklist(chat_id, trigger):
    with BLACKLIST_FILTER_INSERTION_LOCK:
        blacklist_filt = BlackListFilters(str(chat_id), trigger)

        SESSION.merge(blacklist_filt)  # merge to avoid duplicate key issues
        SESSION.commit()
        global CHAT_BLACKLISTS
        if CHAT_BLACKLISTS.get(str(chat_id), set()) == set():
            CHAT_BLACKLISTS[str(chat_id)] = {trigger}
        else:
            CHAT_BLACKLISTS.get(str(chat_id), set()).add(trigger)


def rm_from_blacklist(chat_id, trigger):
    with BLACKLIST_FILTER_INSERTION_LOCK:
        blacklist_filt = SESSION.query(BlackListFilters).get((str(chat_id), trigger))
        if blacklist_filt:
            if trigger in CHAT_BLACKLISTS.get(str(chat_id), set()):  # sanity check
                CHAT_BLACKLISTS.get(str(chat_id), set()).remove(trigger)

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

        SESSION.close()
        return False


def get_chat_blacklist(chat_id):
    return CHAT_BLACKLISTS.get(str(chat_id), set())


def num_blacklist_filters():
    try:
        return SESSION.query(BlackListFilters).count()
    finally:
        SESSION.close()


def num_blacklist_chat_filters(chat_id):
    try:
        return (
            SESSION.query(BlackListFilters.chat_id)
            .filter(BlackListFilters.chat_id == str(chat_id))
            .count()
        )
    finally:
        SESSION.close()


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


def set_blacklist_strength(chat_id, blacklist_type, value):
    # for blacklist_type
    # 0 = nothing
    # 1 = delete
    # 2 = warn
    # 3 = mute
    # 4 = kick
    # 5 = ban
    # 6 = tban
    # 7 = tmute
    with BLACKLIST_SETTINGS_INSERTION_LOCK:
        global CHAT_SETTINGS_BLACKLISTS
        curr_setting = SESSION.query(BlacklistSettings).get(str(chat_id))
        if not curr_setting:
            curr_setting = BlacklistSettings(
                chat_id,
                blacklist_type=int(blacklist_type),
                value=value,
            )

        curr_setting.blacklist_type = int(blacklist_type)
        curr_setting.value = str(value)
        CHAT_SETTINGS_BLACKLISTS[str(chat_id)] = {
            "blacklist_type": int(blacklist_type),
            "value": value,
        }

        SESSION.add(curr_setting)
        SESSION.commit()


def get_blacklist_setting(chat_id):
    try:
        setting = CHAT_SETTINGS_BLACKLISTS.get(str(chat_id))
        if setting:
            return setting["blacklist_type"], setting["value"]
        return 1, "0"

    finally:
        SESSION.close()


def __load_chat_blacklists():
    global CHAT_BLACKLISTS
    try:
        chats = SESSION.query(BlackListFilters.chat_id).distinct().all()
        for (chat_id,) in chats:  # remove tuple by ( ,)
            CHAT_BLACKLISTS[chat_id] = []

        all_filters = SESSION.query(BlackListFilters).all()
        for x in all_filters:
            CHAT_BLACKLISTS[x.chat_id] += [x.trigger]

        CHAT_BLACKLISTS = {x: set(y) for x, y in CHAT_BLACKLISTS.items()}

    finally:
        SESSION.close()


def __load_chat_settings_blacklists():
    global CHAT_SETTINGS_BLACKLISTS
    try:
        chats_settings = SESSION.query(BlacklistSettings).all()
        for x in chats_settings:  # remove tuple by ( ,)
            CHAT_SETTINGS_BLACKLISTS[x.chat_id] = {
                "blacklist_type": x.blacklist_type,
                "value": x.value,
            }

    finally:
        SESSION.close()


def migrate_chat(old_chat_id, new_chat_id):
    with BLACKLIST_FILTER_INSERTION_LOCK:
        chat_filters = (
            SESSION.query(BlackListFilters)
            .filter(BlackListFilters.chat_id == str(old_chat_id))
            .all()
        )
        for filt in chat_filters:
            filt.chat_id = str(new_chat_id)
        SESSION.commit()


__load_chat_blacklists()
__load_chat_settings_blacklists()