#  The MIT License (MIT)
#  Copyright (c) 2021-present foxwhite25
#
#  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
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#  DEALINGS IN THE SOFTWARE.

from __future__ import annotations
from typing import Any, Iterator, List, Optional, TYPE_CHECKING, Tuple

from .asset import Asset, AssetMixin
from .utils import MISSING
from .partial_emoji import _EmojiTag, PartialEmoji
from .user import User

__all__ = (
    'Emoji',
)

if TYPE_CHECKING:
    from .types.emoji import Emoji as EmojiPayload
    from .guild import Guild
    from .state import ConnectionState
    from .abc import Snowflake
    from .role import Role
    from datetime import datetime


class Emoji(_EmojiTag, AssetMixin):
    """表示自定义表情符号。

    根据创建此对象的方式，某些属性的值可以为 ``None`` 。

    .. container:: operations

        .. describe:: x == y

            检查两个表情符号是否相同。

        .. describe:: x != y

            检查两个表情符号是否不同。

        .. describe:: hash(x)

            返回表情符号的哈希值。

        .. describe:: iter(x)

            返回 ``(field, value)`` 对的迭代器。这允许此类在 list dict 结构中用作可迭代对象。

        .. describe:: str(x)

            Returns the emoji rendered for QQ.

    Attributes
    -----------
    name: :class:`str`
        The name of the emoji.
    id: :class:`int`
        The emoji's ID.
    require_colons: :class:`bool`
        If colons are required to use this emoji in the client (:PJSalt: vs PJSalt).
    animated: :class:`bool`
        Whether an emoji is animated or not.
    managed: :class:`bool`
        If this emoji is managed by a Twitch integration.
    guild_id: :class:`int`
        The guild ID the emoji belongs to.
    available: :class:`bool`
        Whether the emoji is available for use.
    user: Optional[:class:`User`]
        The user that created the emoji. This can only be retrieved using :meth:`Guild.fetch_emoji` and
        having the :attr:`~Permissions.manage_emojis` permission.
    """

    __slots__: Tuple[str, ...] = (
        'require_colons',
        'animated',
        'managed',
        'id',
        'name',
        '_roles',
        'guild_id',
        '_state',
        'user',
        'available',
    )

    def __init__(self, *, guild: Guild, state: ConnectionState, data: EmojiPayload):
        self.guild_id: int = guild.id
        self._state: ConnectionState = state
        self._from_data(data)

    def _from_data(self, emoji: EmojiPayload):
        self.require_colons: bool = emoji.get('require_colons', False)
        self.managed: bool = emoji.get('managed', False)
        self.id: int = int(emoji['id'])  # type: ignore
        self.name: str = emoji['name']  # type: ignore
        self.animated: bool = emoji.get('animated', False)
        self.available: bool = emoji.get('available', True)
        self._roles: SnowflakeList = SnowflakeList(map(int, emoji.get('roles', [])))
        user = emoji.get('user')
        self.user: Optional[User] = User(state=self._state, data=user) if user else None

    def _to_partial(self) -> PartialEmoji:
        return PartialEmoji(name=self.name, animated=self.animated, id=self.id)

    def __iter__(self) -> Iterator[Tuple[str, Any]]:
        for attr in self.__slots__:
            if attr[0] != '_':
                value = getattr(self, attr, None)
                if value is not None:
                    yield (attr, value)

    def __str__(self) -> str:
        if self.animated:
            return f'<a:{self.name}:{self.id}>'
        return f'<:{self.name}:{self.id}>'

    def __repr__(self) -> str:
        return f'<Emoji id={self.id} name={self.name!r} animated={self.animated} managed={self.managed}>'

    def __eq__(self, other: Any) -> bool:
        return isinstance(other, _EmojiTag) and self.id == other.id

    def __ne__(self, other: Any) -> bool:
        return not self.__eq__(other)

    def __hash__(self) -> int:
        return self.id >> 22

    @property
    def created_at(self) -> datetime:
        """:class:`datetime.datetime`: Returns the emoji's creation time in UTC."""
        return snowflake_time(self.id)

    @property
    def url(self) -> str:
        """:class:`str`: Returns the URL of the emoji."""
        fmt = 'gif' if self.animated else 'png'
        return f'{Asset.BASE}/emojis/{self.id}.{fmt}'

    @property
    def roles(self) -> List[Role]:
        """List[:class:`Role`]: A :class:`list` of roles that is allowed to use this emoji.

        If roles is empty, the emoji is unrestricted.
        """
        guild = self.guild
        if guild is None:
            return []

        return [role for role in guild.roles if self._roles.has(role.id)]

    @property
    def guild(self) -> Guild:
        """:class:`Guild`: The guild this emoji belongs to."""
        return self._state._get_guild(self.guild_id)

    def is_usable(self) -> bool:
        """:class:`bool`: Whether the bot can use this emoji.

        .. versionadded:: 1.3
        """
        if not self.available:
            return False
        if not self._roles:
            return True
        emoji_roles, my_roles = self._roles, self.guild.me._roles
        return any(my_roles.has(role_id) for role_id in emoji_roles)

    async def delete(self, *, reason: Optional[str] = None) -> None:
        """|coro|

        Deletes the custom emoji.

        You must have :attr:`~Permissions.manage_emojis` permission to
        do this.

        Parameters
        -----------
        reason: Optional[:class:`str`]
            The reason for deleting this emoji. Shows up on the audit log.

        Raises
        -------
        Forbidden
            You are not allowed to delete emojis.
        HTTPException
            An error occurred deleting the emoji.
        """

        await self._state.http.delete_custom_emoji(self.guild.id, self.id, reason=reason)

    async def edit(self, *, name: str = MISSING, roles: List[Snowflake] = MISSING, reason: Optional[str] = None) -> Emoji:
        r"""|coro|

        Edits the custom emoji.

        You must have :attr:`~Permissions.manage_emojis` permission to
        do this.

        .. versionchanged:: 2.0
            The newly updated emoji is returned.

        Parameters
        -----------
        name: :class:`str`
            The new emoji name.
        roles: Optional[List[:class:`~discord.abc.Snowflake`]]
            A list of roles that can use this emoji. An empty list can be passed to make it available to everyone.
        reason: Optional[:class:`str`]
            The reason for editing this emoji. Shows up on the audit log.

        Raises
        -------
        Forbidden
            You are not allowed to edit emojis.
        HTTPException
            An error occurred editing the emoji.

        Returns
        --------
        :class:`Emoji`
            The newly updated emoji.
        """

        payload = {}
        if name is not MISSING:
            payload['name'] = name
        if roles is not MISSING:
            payload['roles'] = [role.id for role in roles]

        data = await self._state.http.edit_custom_emoji(self.guild.id, self.id, payload=payload, reason=reason)
        return Emoji(guild=self.guild, data=data, state=self._state)
