"""
The MIT License (MIT)

Copyright (c) 2015-present 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 __future__ import annotations

from typing import Optional, TYPE_CHECKING

from . import utils
from .app_commands import MissingApplicationID
from .enums import try_enum, SKUType, EntitlementType
from .flags import SKUFlags

if TYPE_CHECKING:
    from datetime import datetime

    from .guild import Guild
    from .state import ConnectionState
    from .types.sku import (
        SKU as SKUPayload,
        Entitlement as EntitlementPayload,
    )
    from .user import User

__all__ = (
    'SKU',
    'Entitlement',
)


class SKU:
    """Represents a premium offering as a stock-keeping unit (SKU).

    .. versionadded:: 2.4

    Attributes
    -----------
    id: :class:`int`
        The SKU's ID.
    type: :class:`SKUType`
        The type of the SKU.
    application_id: :class:`int`
        The ID of the application that the SKU belongs to.
    name: :class:`str`
        The consumer-facing name of the premium offering.
    slug: :class:`str`
        A system-generated URL slug based on the SKU name.
    """

    __slots__ = (
        '_state',
        'id',
        'type',
        'application_id',
        'name',
        'slug',
        '_flags',
    )

    def __init__(self, *, state: ConnectionState, data: SKUPayload):
        self._state: ConnectionState = state
        self.id: int = int(data['id'])
        self.type: SKUType = try_enum(SKUType, data['type'])
        self.application_id: int = int(data['application_id'])
        self.name: str = data['name']
        self.slug: str = data['slug']
        self._flags: int = data['flags']

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

    @property
    def flags(self) -> SKUFlags:
        """:class:`SKUFlags`: Returns the flags of the SKU."""
        return SKUFlags._from_value(self._flags)

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


class Entitlement:
    """Represents an entitlement from user or guild which has been granted access to a premium offering.

    .. versionadded:: 2.4

    Attributes
    -----------
    id: :class:`int`
        The entitlement's ID.
    sku_id: :class:`int`
        The ID of the SKU that the entitlement belongs to.
    application_id: :class:`int`
        The ID of the application that the entitlement belongs to.
    user_id: Optional[:class:`int`]
        The ID of the user that is granted access to the entitlement.
    type: :class:`EntitlementType`
        The type of the entitlement.
    deleted: :class:`bool`
        Whether the entitlement has been deleted.
    starts_at: Optional[:class:`datetime.datetime`]
        A UTC start date which the entitlement is valid. Not present when using test entitlements.
    ends_at: Optional[:class:`datetime.datetime`]
        A UTC date which entitlement is no longer valid. Not present when using test entitlements.
    guild_id: Optional[:class:`int`]
        The ID of the guild that is granted access to the entitlement
    """

    __slots__ = (
        '_state',
        'id',
        'sku_id',
        'application_id',
        'user_id',
        'type',
        'deleted',
        'starts_at',
        'ends_at',
        'guild_id',
    )

    def __init__(self, state: ConnectionState, data: EntitlementPayload):
        self._state: ConnectionState = state
        self.id: int = int(data['id'])
        self.sku_id: int = int(data['sku_id'])
        self.application_id: int = int(data['application_id'])
        self.user_id: Optional[int] = utils._get_as_snowflake(data, 'user_id')
        self.type: EntitlementType = try_enum(EntitlementType, data['type'])
        self.deleted: bool = data['deleted']
        self.starts_at: Optional[datetime] = utils.parse_time(data.get('starts_at', None))
        self.ends_at: Optional[datetime] = utils.parse_time(data.get('ends_at', None))
        self.guild_id: Optional[int] = utils._get_as_snowflake(data, 'guild_id')

    def __repr__(self) -> str:
        return f'<Entitlement id={self.id} type={self.type!r} user_id={self.user_id}>'

    @property
    def user(self) -> Optional[User]:
        """Optional[:class:`User`]: The user that is granted access to the entitlement."""
        if self.user_id is None:
            return None
        return self._state.get_user(self.user_id)

    @property
    def guild(self) -> Optional[Guild]:
        """Optional[:class:`Guild`]: The guild that is granted access to the entitlement."""
        return self._state._get_guild(self.guild_id)

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

    def is_expired(self) -> bool:
        """:class:`bool`: Returns ``True`` if the entitlement is expired. Will be always False for test entitlements."""
        if self.ends_at is None:
            return False
        return utils.utcnow() >= self.ends_at

    async def delete(self) -> None:
        """|coro|

        Deletes the entitlement.

        Raises
        -------
        MissingApplicationID
            The application ID could not be found.
        NotFound
            The entitlement could not be found.
        HTTPException
            Deleting the entitlement failed.
        """

        if self.application_id is None:
            raise MissingApplicationID

        await self._state.http.delete_entitlement(self.application_id, self.id)
