"""
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

import copy
from typing import (
    TYPE_CHECKING,
    Any,
    ClassVar,
    Coroutine,
    Dict,
    Generator,
    List,
    Literal,
    Optional,
    TypeVar,
    Union,
)

from .item import Item, ContainedItemCallbackType as ItemCallbackType
from .view import _component_to_item, LayoutView
from ..enums import ComponentType
from ..utils import get as _utils_get
from ..colour import Colour, Color

if TYPE_CHECKING:
    from typing_extensions import Self

    from ..components import Container as ContainerComponent
    from ..interactions import Interaction
    from .dynamic import DynamicItem

S = TypeVar('S', bound='Container', covariant=True)
V = TypeVar('V', bound='LayoutView', covariant=True)

__all__ = ('Container',)


class _ContainerCallback:
    __slots__ = ('container', 'callback', 'item')

    def __init__(self, callback: ItemCallbackType[S, Any], container: Container, item: Item[Any]) -> None:
        self.callback: ItemCallbackType[Any, Any] = callback
        self.container: Container = container
        self.item: Item[Any] = item

    def __call__(self, interaction: Interaction) -> Coroutine[Any, Any, Any]:
        return self.callback(self.container, interaction, self.item)


class Container(Item[V]):
    r"""Represents a UI container.

    This is a top-level layout component that can only be used on :class:`LayoutView`
    and can contain :class:`ActionRow`\s, :class:`TextDisplay`\s, :class:`Section`\s,
    :class:`MediaGallery`\s, :class:`File`\s, and :class:`Separator`\s in it.

    This can be inherited.


    .. versionadded:: 2.6

    Examples
    --------

    .. code-block:: python3

        import discord
        from discord import ui

        # you can subclass it and add components as you would add them
        # in a LayoutView
        class MyContainer(ui.Container):
            action_row = ui.ActionRow()

            @action_row.button(label='A button in a container!')
            async def a_button(self, interaction: discord.Interaction, button: discord.ui.Button):
                await interaction.response.send_message('You clicked a button!')

        # or use it directly on LayoutView
        class MyView(ui.LayoutView):
            container = ui.Container(ui.TextDisplay('I am a text display on a container!'))
            # or you can use your subclass:
            # container = MyContainer()

    Parameters
    ----------
    \*children: :class:`Item`
        The initial children of this container.
    accent_colour: Optional[Union[:class:`.Colour`, :class:`int`]]
        The colour of the container. Defaults to ``None``.
    accent_color: Optional[Union[:class:`.Colour`, :class:`int`]]
        The color of the container. Defaults to ``None``.
    spoiler: :class:`bool`
        Whether to flag this container as a spoiler. Defaults
        to ``False``.
    id: Optional[:class:`int`]
        The ID of this component. This must be unique across the view.
    """

    __container_children_items__: ClassVar[Dict[str, Union[ItemCallbackType[Self, Any], Item[Any]]]] = {}
    __discord_ui_container__: ClassVar[bool] = True
    __item_repr_attributes__ = (
        'accent_colour',
        'spoiler',
        'id',
    )

    def __init__(
        self,
        *children: Item[V],
        accent_colour: Optional[Union[Colour, int]] = None,
        accent_color: Optional[Union[Color, int]] = None,
        spoiler: bool = False,
        id: Optional[int] = None,
    ) -> None:
        super().__init__()
        self._children: List[Item[V]] = self._init_children()
        for child in children:
            self.add_item(child)

        self.spoiler: bool = spoiler
        self._colour = accent_colour if accent_colour is not None else accent_color
        self.id = id

    def __repr__(self) -> str:
        return f'<{self.__class__.__name__} children={len(self._children)}>'

    def _init_children(self) -> List[Item[Any]]:
        children = []
        parents = {}

        for name, raw in self.__container_children_items__.items():
            if isinstance(raw, Item):
                item = raw.copy()
                item._parent = self
                setattr(self, name, item)
                children.append(item)
                parents[raw] = item
            else:
                # action rows can be created inside containers, and then callbacks can exist here
                # so we create items based off them
                item: Item = raw.__discord_ui_model_type__(**raw.__discord_ui_model_kwargs__)
                item.callback = _ContainerCallback(raw, self, item)  # type: ignore
                setattr(self, raw.__name__, item)
                # this should not fail because in order for a function to be here it should be from
                # an action row and must have passed the check in __init_subclass__, but still
                # guarding it
                parent = getattr(raw, '__discord_ui_parent__', None)
                if parent is None:
                    raise ValueError(f'{raw.__name__} is not a valid item for a Container')
                parents.get(parent, parent)._children.append(item)
                # we do not append it to the children list because technically these buttons and
                # selects are not from the container but the action row itself.

        return children

    def __init_subclass__(cls) -> None:
        super().__init_subclass__()

        children: Dict[str, Union[ItemCallbackType[Self, Any], Item[Any]]] = {}
        for base in reversed(cls.__mro__):
            for name, member in base.__dict__.items():
                if isinstance(member, Item):
                    children[name] = member
                if hasattr(member, '__discord_ui_model_type__') and getattr(member, '__discord_ui_parent__', None):
                    children[name] = copy.copy(member)

        cls.__container_children_items__ = children

    def _update_view(self, view) -> bool:
        self._view = view
        for child in self._children:
            child._update_view(view)
        return True

    def _has_children(self):
        return True

    def _swap_item(self, base: Item, new: DynamicItem, custom_id: str) -> None:
        child_index = self._children.index(base)
        self._children[child_index] = new  # type: ignore

    @property
    def children(self) -> List[Item[V]]:
        """List[:class:`Item`]: The children of this container."""
        return self._children.copy()

    @property
    def accent_colour(self) -> Optional[Union[Colour, int]]:
        """Optional[Union[:class:`discord.Colour`, :class:`int`]]: The colour of the container, or ``None``."""
        return self._colour

    @accent_colour.setter
    def accent_colour(self, value: Optional[Union[Colour, int]]) -> None:
        if value is not None and not isinstance(value, (int, Colour)):
            raise TypeError(f'expected an int, or Colour, not {value.__class__.__name__!r}')

        self._colour = value

    accent_color = accent_colour

    @property
    def type(self) -> Literal[ComponentType.container]:
        return ComponentType.container

    @property
    def width(self):
        return 5

    @property
    def _total_count(self) -> int:
        # 1 for self and all children
        return 1 + len(tuple(self.walk_children()))

    def _is_v2(self) -> bool:
        return True

    def to_components(self) -> List[Dict[str, Any]]:
        components = []
        for i in self._children:
            components.append(i.to_component_dict())
        return components

    def to_component_dict(self) -> Dict[str, Any]:
        components = self.to_components()

        colour = None
        if self._colour:
            colour = self._colour if isinstance(self._colour, int) else self._colour.value

        base = {
            'type': self.type.value,
            'accent_color': colour,
            'spoiler': self.spoiler,
            'components': components,
        }
        if self.id is not None:
            base['id'] = self.id
        return base

    @classmethod
    def from_component(cls, component: ContainerComponent) -> Self:
        self = cls(
            accent_colour=component.accent_colour,
            spoiler=component.spoiler,
            id=component.id,
        )
        self._children = [_component_to_item(cmp, self) for cmp in component.children]
        return self

    def walk_children(self) -> Generator[Item[V], None, None]:
        """An iterator that recursively walks through all the children of this container
        and its children, if applicable.

        Yields
        ------
        :class:`Item`
            An item in the container.
        """

        for child in self.children:
            yield child

            if child._has_children():
                yield from child.walk_children()  # type: ignore

    def content_length(self) -> int:
        """:class:`int`: Returns the total length of all text content in this container."""
        from .text_display import TextDisplay

        return sum(len(item.content) for item in self.walk_children() if isinstance(item, TextDisplay))

    def add_item(self, item: Item[Any]) -> Self:
        """Adds an item to this container.

        This function returns the class instance to allow for fluent-style
        chaining.

        Parameters
        ----------
        item: :class:`Item`
            The item to append.

        Raises
        ------
        TypeError
            An :class:`Item` was not passed.
        ValueError
            Maximum number of children has been exceeded (40) for the entire view.
        """
        if not isinstance(item, Item):
            raise TypeError(f'expected Item not {item.__class__.__name__}')

        if self._view:
            self._view._add_count(item._total_count)

        self._children.append(item)
        item._update_view(self.view)
        item._parent = self
        return self

    def remove_item(self, item: Item[Any]) -> Self:
        """Removes an item from this container.

        This function returns the class instance to allow for fluent-style
        chaining.

        Parameters
        ----------
        item: :class:`Item`
            The item to remove from the container.
        """

        try:
            self._children.remove(item)
        except ValueError:
            pass
        else:
            if self._view:
                self._view._add_count(-item._total_count)
        return self

    def find_item(self, id: int, /) -> Optional[Item[V]]:
        """Gets an item with :attr:`Item.id` set as ``id``, or ``None`` if
        not found.

        .. warning::

            This is **not the same** as ``custom_id``.

        Parameters
        ----------
        id: :class:`int`
            The ID of the component.

        Returns
        -------
        Optional[:class:`Item`]
            The item found, or ``None``.
        """
        return _utils_get(self.walk_children(), id=id)

    def clear_items(self) -> Self:
        """Removes all the items from the container.

        This function returns the class instance to allow for fluent-style
        chaining.
        """

        if self._view:
            self._view._add_count(-len(tuple(self.walk_children())))
        self._children.clear()
        return self
