# -*- coding: utf-8 -*-

"""
The MIT License (MIT)

Copyright (c) 2015-2019 Rapptz

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.
"""

from .permissions import Permissions
from .errors import InvalidArgument
from .colour import Colour
from .mixins import Hashable
from .utils import snowflake_time

class Role(Hashable):
    """Represents a Discord role in a :class:`Guild`.

    .. container:: operations

        .. describe:: x == y

            Checks if two roles are equal.

        .. describe:: x != y

            Checks if two roles are not equal.

        .. describe:: x > y

            Checks if a role is higher than another in the hierarchy.

        .. describe:: x < y

            Checks if a role is lower than another in the hierarchy.

        .. describe:: x >= y

            Checks if a role is higher or equal to another in the hierarchy.

        .. describe:: x <= y

            Checks if a role is lower or equal to another in the hierarchy.

        .. describe:: hash(x)

            Return the role's hash.

        .. describe:: str(x)

            Returns the role's name.

    Attributes
    ----------
    id: :class:`int`
        The ID for the role.
    name: :class:`str`
        The name of the role.
    permissions: :class:`Permissions`
        Represents the role's permissions.
    guild: :class:`Guild`
        The guild the role belongs to.
    colour: :class:`Colour`
        Represents the role colour. An alias exists under ``color``.
    hoist: :class:`bool`
         Indicates if the role will be displayed separately from other members.
    position: :class:`int`
        The position of the role. This number is usually positive. The bottom
        role has a position of 0.
    managed: :class:`bool`
        Indicates if the role is managed by the guild through some form of
        integrations such as Twitch.
    mentionable: :class:`bool`
        Indicates if the role can be mentioned by users.
    """

    __slots__ = ('id', 'name', 'permissions', 'color', 'colour', 'position',
                 'managed', 'mentionable', 'hoist', 'guild', '_state')

    def __init__(self, *, guild, state, data):
        self.guild = guild
        self._state = state
        self.id = int(data['id'])
        self._update(data)

    def __str__(self):
        return self.name

    def __repr__(self):
        return '<Role id={0.id} name={0.name!r}>'.format(self)

    def __lt__(self, other):
        if not isinstance(other, Role) or not isinstance(self, Role):
            return NotImplemented

        if self.guild != other.guild:
            raise RuntimeError('cannot compare roles from two different guilds.')

        # the @everyone role is always the lowest role in hierarchy
        guild_id = self.guild.id
        if self.id == guild_id:
            # everyone_role < everyone_role -> False
            return other.id != guild_id

        if self.position < other.position:
            return True

        if self.position == other.position:
            return int(self.id) > int(other.id)

        return False

    def __le__(self, other):
        r = Role.__lt__(other, self)
        if r is NotImplemented:
            return NotImplemented
        return not r

    def __gt__(self, other):
        return Role.__lt__(other, self)

    def __ge__(self, other):
        r = Role.__lt__(self, other)
        if r is NotImplemented:
            return NotImplemented
        return not r

    def _update(self, data):
        self.name = data['name']
        self.permissions = Permissions(data.get('permissions', 0))
        self.position = data.get('position', 0)
        self.colour = Colour(data.get('color', 0))
        self.hoist = data.get('hoist', False)
        self.managed = data.get('managed', False)
        self.mentionable = data.get('mentionable', False)
        self.color = self.colour

    def is_default(self):
        """Checks if the role is the default role."""
        return self.guild.id == self.id

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

    @property
    def mention(self):
        """:class:`str`: Returns a string that allows you to mention a role."""
        return '<@&%s>' % self.id

    @property
    def members(self):
        """List[:class:`Member`]: Returns all the members with this role."""
        all_members = self.guild.members
        if self.is_default():
            return all_members

        role_id = self.id
        return [member for member in all_members if member._roles.has(role_id)]

    async def _move(self, position, reason):
        if position <= 0:
            raise InvalidArgument("Cannot move role to position 0 or below")

        if self.is_default():
            raise InvalidArgument("Cannot move default role")

        if self.position == position:
            return  # Save discord the extra request.

        http = self._state.http

        change_range = range(min(self.position, position), max(self.position, position) + 1)
        roles = [r.id for r in self.guild.roles[1:] if r.position in change_range and r.id != self.id]

        if self.position > position:
            roles.insert(0, self.id)
        else:
            roles.append(self.id)

        payload = [{"id": z[0], "position": z[1]} for z in zip(roles, change_range)]
        await http.move_role_position(self.guild.id, payload, reason=reason)

    async def edit(self, *, reason=None, **fields):
        """|coro|

        Edits the role.

        You must have the :attr:`~Permissions.manage_roles` permission to
        use this.

        All fields are optional.

        Parameters
        -----------
        name: :class:`str`
            The new role name to change to.
        permissions: :class:`Permissions`
            The new permissions to change to.
        colour: :class:`Colour`
            The new colour to change to. (aliased to color as well)
        hoist: :class:`bool`
            Indicates if the role should be shown separately in the member list.
        mentionable: :class:`bool`
            Indicates if the role should be mentionable by others.
        position: :class:`int`
            The new role's position. This must be below your top role's
            position or it will fail.
        reason: Optional[:class:`str`]
            The reason for editing this role. Shows up on the audit log.

        Raises
        -------
        Forbidden
            You do not have permissions to change the role.
        HTTPException
            Editing the role failed.
        InvalidArgument
            An invalid position was given or the default
            role was asked to be moved.
        """

        position = fields.get('position')
        if position is not None:
            await self._move(position, reason=reason)
            self.position = position

        try:
            colour = fields['colour']
        except KeyError:
            colour = fields.get('color', self.colour)

        payload = {
            'name': fields.get('name', self.name),
            'permissions': fields.get('permissions', self.permissions).value,
            'color': colour.value,
            'hoist': fields.get('hoist', self.hoist),
            'mentionable': fields.get('mentionable', self.mentionable)
        }

        data = await self._state.http.edit_role(self.guild.id, self.id, reason=reason, **payload)
        self._update(data)

    async def delete(self, *, reason=None):
        """|coro|

        Deletes the role.

        You must have the :attr:`~Permissions.manage_roles` permission to
        use this.

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

        Raises
        --------
        Forbidden
            You do not have permissions to delete the role.
        HTTPException
            Deleting the role failed.
        """

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