"""
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, Boolean, Column, String, UnicodeText, distinct, func
from sqlalchemy.dialects import postgresql

from Database.sql import BASE, SESSION


class Warns(BASE):
    __tablename__ = "warns"

    user_id = Column(BigInteger, primary_key=True)
    chat_id = Column(String(14), primary_key=True)
    num_warns = Column(BigInteger, default=0)
    reasons = Column(postgresql.ARRAY(UnicodeText))

    def __init__(self, user_id, chat_id):
        self.user_id = user_id
        self.chat_id = str(chat_id)
        self.num_warns = 0
        self.reasons = []

    def __repr__(self):
        return "<{} ᴡᴀʀɴs ғᴏʀ {} ɪɴ {} ғᴏʀ ʀᴇᴀsᴏɴs {}>".format(
            self.num_warns,
            self.user_id,
            self.chat_id,
            self.reasons,
        )


class WarnFilters(BASE):
    __tablename__ = "warn_filters"
    chat_id = Column(String(14), primary_key=True)
    keyword = Column(UnicodeText, primary_key=True, nullable=False)
    reply = Column(UnicodeText, nullable=False)

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

    def __repr__(self):
        return "<ᴘᴇʀᴍɪssɪᴏɴs ғᴏʀ %s>" % self.chat_id

    def __eq__(self, other):
        return bool(
            isinstance(other, WarnFilters)
            and self.chat_id == other.chat_id
            and self.keyword == other.keyword,
        )


class WarnSettings(BASE):
    __tablename__ = "warn_settings"
    chat_id = Column(String(14), primary_key=True)
    warn_limit = Column(BigInteger, default=3)
    soft_warn = Column(Boolean, default=False)

    def __init__(self, chat_id, warn_limit=3, soft_warn=False):
        self.chat_id = str(chat_id)
        self.warn_limit = warn_limit
        self.soft_warn = soft_warn

    def __repr__(self):
        return "<{} ʜᴀs {} ᴘᴏssɪʙʟᴇ ᴡᴀʀɴs.>".format(self.chat_id, self.warn_limit)


Warns.__table__.create(checkfirst=True)
WarnFilters.__table__.create(checkfirst=True)
WarnSettings.__table__.create(checkfirst=True)

WARN_INSERTION_LOCK = threading.RLock()
WARN_FILTER_INSERTION_LOCK = threading.RLock()
WARN_SETTINGS_LOCK = threading.RLock()

WARN_FILTERS = {}


def warn_user(user_id, chat_id, reason=None):
    with WARN_INSERTION_LOCK:
        warned_user = SESSION.query(Warns).get((user_id, str(chat_id)))
        if not warned_user:
            warned_user = Warns(user_id, str(chat_id))

        warned_user.num_warns += 1
        if reason:
            warned_user.reasons = warned_user.reasons + [
                reason,
            ]  # TODO:: double check this wizardry

        reasons = warned_user.reasons
        num = warned_user.num_warns

        SESSION.add(warned_user)
        SESSION.commit()

        return num, reasons


def remove_warn(user_id, chat_id):
    with WARN_INSERTION_LOCK:
        removed = False
        warned_user = SESSION.query(Warns).get((user_id, str(chat_id)))

        if warned_user and warned_user.num_warns > 0:
            warned_user.num_warns -= 1
            warned_user.reasons = warned_user.reasons[:-1]
            SESSION.add(warned_user)
            SESSION.commit()
            removed = True

        SESSION.close()
        return removed


def reset_warns(user_id, chat_id):
    with WARN_INSERTION_LOCK:
        warned_user = SESSION.query(Warns).get((user_id, str(chat_id)))
        if warned_user:
            warned_user.num_warns = 0
            warned_user.reasons = []

            SESSION.add(warned_user)
            SESSION.commit()
        SESSION.close()


def get_warns(user_id, chat_id):
    try:
        user = SESSION.query(Warns).get((user_id, str(chat_id)))
        if not user:
            return None
        reasons = user.reasons
        num = user.num_warns
        return num, reasons
    finally:
        SESSION.close()


def add_warn_filter(chat_id, keyword, reply):
    with WARN_FILTER_INSERTION_LOCK:
        warn_filt = WarnFilters(str(chat_id), keyword, reply)

        if keyword not in WARN_FILTERS.get(str(chat_id), []):
            WARN_FILTERS[str(chat_id)] = sorted(
                WARN_FILTERS.get(str(chat_id), []) + [keyword],
                key=lambda x: (-len(x), x),
            )

        SESSION.merge(warn_filt)  # merge to avoid duplicate key issues
        SESSION.commit()


def remove_warn_filter(chat_id, keyword):
    with WARN_FILTER_INSERTION_LOCK:
        warn_filt = SESSION.query(WarnFilters).get((str(chat_id), keyword))
        if warn_filt:
            if keyword in WARN_FILTERS.get(str(chat_id), []):  # sanity check
                WARN_FILTERS.get(str(chat_id), []).remove(keyword)

            SESSION.delete(warn_filt)
            SESSION.commit()
            return True
        SESSION.close()
        return False


def get_chat_warn_triggers(chat_id):
    return WARN_FILTERS.get(str(chat_id), set())


def get_chat_warn_filters(chat_id):
    try:
        return (
            SESSION.query(WarnFilters).filter(WarnFilters.chat_id == str(chat_id)).all()
        )
    finally:
        SESSION.close()


def get_warn_filter(chat_id, keyword):
    try:
        return SESSION.query(WarnFilters).get((str(chat_id), keyword))
    finally:
        SESSION.close()


def set_warn_limit(chat_id, warn_limit):
    with WARN_SETTINGS_LOCK:
        curr_setting = SESSION.query(WarnSettings).get(str(chat_id))
        if not curr_setting:
            curr_setting = WarnSettings(chat_id, warn_limit=warn_limit)

        curr_setting.warn_limit = warn_limit

        SESSION.add(curr_setting)
        SESSION.commit()


def set_warn_strength(chat_id, soft_warn):
    with WARN_SETTINGS_LOCK:
        curr_setting = SESSION.query(WarnSettings).get(str(chat_id))
        if not curr_setting:
            curr_setting = WarnSettings(chat_id, soft_warn=soft_warn)

        curr_setting.soft_warn = soft_warn

        SESSION.add(curr_setting)
        SESSION.commit()


def get_warn_setting(chat_id):
    try:
        setting = SESSION.query(WarnSettings).get(str(chat_id))
        if setting:
            return setting.warn_limit, setting.soft_warn
        return 3, False

    finally:
        SESSION.close()


def num_warns():
    try:
        return SESSION.query(func.sum(Warns.num_warns)).scalar() or 0
    finally:
        SESSION.close()


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


def num_warn_filters():
    try:
        return SESSION.query(WarnFilters).count()
    finally:
        SESSION.close()


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


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


def __load_chat_warn_filters():
    global WARN_FILTERS
    try:
        chats = SESSION.query(WarnFilters.chat_id).distinct().all()
        for (chat_id,) in chats:  # remove tuple by ( ,)
            WARN_FILTERS[chat_id] = []

        all_filters = SESSION.query(WarnFilters).all()
        for x in all_filters:
            WARN_FILTERS[x.chat_id] += [x.keyword]

        WARN_FILTERS = {
            x: sorted(set(y), key=lambda i: (-len(i), i))
            for x, y in WARN_FILTERS.items()
        }

    finally:
        SESSION.close()


def migrate_chat(old_chat_id, new_chat_id):
    with WARN_INSERTION_LOCK:
        chat_notes = (
            SESSION.query(Warns).filter(Warns.chat_id == str(old_chat_id)).all()
        )
        for note in chat_notes:
            note.chat_id = str(new_chat_id)
        SESSION.commit()

    with WARN_FILTER_INSERTION_LOCK:
        chat_filters = (
            SESSION.query(WarnFilters)
            .filter(WarnFilters.chat_id == str(old_chat_id))
            .all()
        )
        for filt in chat_filters:
            filt.chat_id = str(new_chat_id)
        SESSION.commit()
        old_warn_filt = WARN_FILTERS.get(str(old_chat_id))
        if old_warn_filt is not None:
            WARN_FILTERS[str(new_chat_id)] = old_warn_filt
            del WARN_FILTERS[str(old_chat_id)]

    with WARN_SETTINGS_LOCK:
        chat_settings = (
            SESSION.query(WarnSettings)
            .filter(WarnSettings.chat_id == str(old_chat_id))
            .all()
        )
        for setting in chat_settings:
            setting.chat_id = str(new_chat_id)
        SESSION.commit()


__load_chat_warn_filters()