"""
Components/Toolbar
==================

.. seealso::

    `Material Design spec, App bars: top <https://material.io/components/app-bars-top>`_

    `Material Design spec, App bars: bottom <https://material.io/components/app-bars-bottom/app-bars-bottom.html>`_

    `Material Design 3 spec, App bars: bottom <https://m3.material.io/components/top-app-bar/overview>`_

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/app-bar-top.png
    :align: center

`KivyMD` provides the following toolbar positions for use:

- Top_
- Bottom_

.. Top:
Top
---

.. code-block:: python

    from kivy.lang import Builder

    from kivymd.app import MDApp

    KV = '''
    MDBoxLayout:
        orientation: "vertical"

        MDTopAppBar:
            title: "MDTopAppBar"

        MDLabel:
            text: "Content"
            halign: "center"
    '''


    class Test(MDApp):
        def build(self):
            return Builder.load_string(KV)


    Test().run()

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-1.png
    :align: center

Add left menu
-------------

.. code-block:: kv

    MDTopAppBar:
        title: "MDTopAppBar"
        left_action_items: [["menu", lambda x: app.callback()]]

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-2.png
    :align: center

.. note::

    The callback is optional. ``left_action_items: [["menu"]]`` would also work for a button that does nothing.

Add right menu
--------------

.. code-block:: kv

    MDTopAppBar:
        title: "MDTopAppBar"
        right_action_items: [["dots-vertical", lambda x: app.callback()]]

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-3.png
    :align: center

Add two item to the right menu
------------------------------

.. code-block:: kv

    MDTopAppBar:
        title: "MDTopAppBar"
        right_action_items: [["dots-vertical", lambda x: app.callback_1()], ["clock", lambda x: app.callback_2()]]

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-4.png
    :align: center

Change toolbar color
--------------------

.. code-block:: kv

    MDTopAppBar:
        title: "MDTopAppBar"
        md_bg_color: app.theme_cls.accent_color

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-5.png
    :align: center

Change toolbar text color
-------------------------

.. code-block:: kv

    MDTopAppBar:
        title: "MDTopAppBar"
        specific_text_color: app.theme_cls.accent_color

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-6.png
    :align: center

Shadow elevation control
------------------------

.. code-block:: kv

    MDTopAppBar:
        title: "Elevation 4"
        elevation: 4

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-7.png
    :align: center

.. Bottom:
Bottom
------

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/app-bar-bottom.png
    :align: center

Usage
-----

.. code-block:: python

    from kivy.lang import Builder

    from kivymd.app import MDApp

    KV = '''
    MDBoxLayout:

        # Will always be at the bottom of the screen.
        MDBottomAppBar:

            MDTopAppBar:
                title: "Title"
                icon: "git"
                type: "bottom"
                left_action_items: [["menu", lambda x: x]]
    '''


    class Test(MDApp):
        def build(self):
            return Builder.load_string(KV)


    Test().run()

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-8.png
    :align: center

Event on floating button
------------------------

Event ``on_action_button``:

.. code-block:: kv

    MDBottomAppBar:

        MDTopAppBar:
            title: "Title"
            icon: "git"
            type: "bottom"
            left_action_items: [["menu", lambda x: x]]
            on_action_button: app.callback(self.icon)

Floating button position
------------------------

Mode:

- `'free-end'`
- `'free-center'`
- `'end'`
- `'center'`

.. code-block:: kv

    MDBottomAppBar:

        MDTopAppBar:
            title: "Title"
            icon: "git"
            type: "bottom"
            left_action_items: [["menu", lambda x: x]]
            mode: "end"

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-9.png
    :align: center

.. code-block:: kv

    MDBottomAppBar:

        MDTopAppBar:
            title: "Title"
            icon: "git"
            type: "bottom"
            left_action_items: [["menu", lambda x: x]]
            mode: "free-end"

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-10.png
    :align: center

Custom color
------------

.. code-block:: kv

    MDBottomAppBar:
        md_bg_color: 0, 1, 0, 1

        MDTopAppBar:
            title: "Title"
            icon: "git"
            type: "bottom"
            left_action_items: [["menu", lambda x: x]]
            icon_color: 0, 1, 0, 1

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-11.png
    :align: center

Tooltips
--------

You can add MDTooltips to the Toolbar icons by ading a text string to the toolbar item, as shown below

.. code-block:: python

    from kivy.lang import Builder

    from kivymd.app import MDApp
    from kivymd.uix.snackbar import Snackbar

    KV = '''
    MDBoxLayout:
        orientation: "vertical"

        MDTopAppBar:
            title: "MDTopAppBar"
            left_action_items: [["menu", "This is the navigation"]]
            right_action_items:
                [["dots-vertical", lambda x: app.callback(x), "this is the More Actions"]]

        MDLabel:
            text: "Content"
            halign: "center"
    '''


    class Test(MDApp):
        def build(self):
            return Builder.load_string(KV)

        def callback(self, button):
            Snackbar(text="Hello World").open()

    Test().run()

Material design 3 style
-----------------------

.. code-block:: python

    from kivy.lang import Builder

    from kivymd.app import MDApp
    from kivymd.uix.toolbar import MDTopAppBar

    KV = '''
    MDScreen:

        MDBoxLayout:
            id: box
            orientation: "vertical"
            spacing: "12dp"
            pos_hint: {"top": 1}
            adaptive_height: True
    '''


    class TestNavigationDrawer(MDApp):
        def build(self):
            self.theme_cls.material_style = "M3"
            return Builder.load_string(KV)

        def on_start(self):
            for type_height in ["medium", "large", "small"]:
                self.root.ids.box.add_widget(
                    MDTopAppBar(
                        type_height=type_height,
                        headline_text=f"Headline {type_height.lower()}",
                        md_bg_color="#2d2734",
                        left_action_items=[["arrow-left", lambda x: x]],
                        right_action_items=[
                            ["attachment", lambda x: x],
                            ["calendar", lambda x: x],
                            ["dots-vertical", lambda x: x],
                        ],
                        title="Title" if type_height == "small" else ""
                    )
                )


    TestNavigationDrawer().run()

.. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-m3.png
    :align: center
"""

__all__ = ("MDTopAppBar", "MDBottomAppBar", "ActionTopAppBarButton")

import os
from math import cos, radians, sin
from typing import Union

from kivy.animation import Animation
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.lang import Builder
from kivy.metrics import dp
from kivy.properties import (
    BooleanProperty,
    ColorProperty,
    ListProperty,
    NumericProperty,
    ObjectProperty,
    OptionProperty,
    StringProperty,
)
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout

from kivymd import uix_path
from kivymd.color_definitions import text_colors
from kivymd.theming import ThemableBehavior
from kivymd.uix.behaviors import (
    CommonElevationBehavior,
    DeclarativeBehavior,
    ScaleBehavior,
    SpecificBackgroundColorBehavior,
)
from kivymd.uix.button import MDFloatingActionButton, MDIconButton
from kivymd.uix.controllers import WindowController
from kivymd.uix.list import OneLineIconListItem
from kivymd.uix.menu import MDDropdownMenu
from kivymd.uix.tooltip import MDTooltip
from kivymd.utils.set_bars_colors import set_bars_colors

with open(
    os.path.join(uix_path, "toolbar", "toolbar.kv"), encoding="utf-8"
) as kv_file:
    Builder.load_string(kv_file.read())


class ActionBottomAppBarButton(MDFloatingActionButton, ScaleBehavior):
    """
    Implements a floating action button (FAB) for a toolbar with type 'bottom'.
    """


class ActionTopAppBarButton(MDIconButton, MDTooltip):
    """Implements action buttons on the toolbar."""

    # The text of the menu item of the corresponding action button that will
    # be displayed in the `OverFlowMenu` menu.
    overflow_text = StringProperty()


class ActionOverFlowButton(ActionTopAppBarButton):
    """Implements a toolbar action button for the `OverFlowMenu` menu."""

    icon = "dots-vertical"


class OverFlowMenu(MDDropdownMenu):
    """
    Implements a menu for the items (:class:`~OverFlowMenuItem`) of the
    corresponding action buttons.
    """


class OverFlowMenuItem(OneLineIconListItem):
    """Implements a menu (:class:`~OverFlowMenu`) item."""

    icon = StringProperty()


class NotchedBox(
    ThemableBehavior,
    CommonElevationBehavior,
    SpecificBackgroundColorBehavior,
    BoxLayout,
):
    elevation = NumericProperty(4)
    notch_radius = NumericProperty()
    notch_center_x = NumericProperty("100dp")

    _indices_right = ListProperty()
    _vertices_right = ListProperty()
    _indices_left = ListProperty()
    _vertices_left = ListProperty()
    _rounded_rectangle_height = NumericProperty("6dp")
    _total_angle = NumericProperty(180)
    _rectangle_left_pos = ListProperty([0, 0])
    _rectangle_left_width = NumericProperty()
    _rectangle_right_pos = ListProperty([0, 0])
    _rectangle_right_width = NumericProperty()
    _rounding_percentage = NumericProperty(0.15)
    _shift = NumericProperty(dp(4))

    def __init__(self, **kw):
        super().__init__(**kw)
        self.bind(
            size=self._update_canvas,
            pos=self._update_canvas,
            notch_radius=self._update_canvas,
            notch_center_x=self._update_canvas,
        )
        Clock.schedule_once(self._update_canvas)

    def _update_canvas(self, *args):
        pos = self.pos
        size = [
            self.width,
            self.size[1] - self._rounded_rectangle_height / 2,
        ]
        notch_center_x = self.pos[0] + self.notch_center_x
        circle_radius = self.notch_radius
        degree_diff = int((180 - self._total_angle) / 2)
        circle_center = [notch_center_x, pos[1] + size[1]]
        left_circle_pos = self._points_on_circle(
            circle_center, circle_radius, 180 + degree_diff, 270
        )

        self._rectangle_left_pos = [
            pos[0],
            pos[1] + size[1] - self._rounded_rectangle_height / 2,
        ]
        self._rectangle_left_width = left_circle_pos[0][0] - self.pos[0]

        right_circle_pos = self._points_on_circle(
            circle_center, circle_radius, -degree_diff, -90
        )

        self._rectangle_right_pos = [
            right_circle_pos[0][0],
            pos[1] + size[1] - self._rounded_rectangle_height / 2,
        ]
        self._rectangle_right_width = pos[0] + size[0] - right_circle_pos[0][0]

        raw_vertices_left = self._make_vertices(
            pos, [notch_center_x - pos[0], size[1]], "left", left_circle_pos
        )
        raw_vertices_right = self._make_vertices(
            [notch_center_x, pos[1]],
            [size[0] + pos[0] - notch_center_x, size[1]],
            "right",
            right_circle_pos,
        )

        left_vertices, left_indices = self._make_vertices_indices(
            raw_vertices_left
        )
        right_vertices, right_indices = self._make_vertices_indices(
            raw_vertices_right
        )

        self._update_mesh(left_vertices, left_indices, "left")
        self._update_mesh(right_vertices, right_indices, "right")

    def _update_mesh(self, vertices, indices, mode):
        if mode == "left":
            self._indices_left = indices
            self._vertices_left = vertices
        else:
            self._indices_right = indices
            self._vertices_right = vertices
        return True

    @staticmethod
    def _make_vertices_indices(points_list):
        vertices = []
        indices = []
        for index, point in enumerate(points_list):
            indices.append(index)
            vertices.extend([point[0], point[1], 0, 0])

        return [vertices, indices]

    @staticmethod
    def _make_vertices(rectangle_pos, rectangle_size, mode, notch_points=[]):
        x = rectangle_pos[0]
        y = rectangle_pos[1]
        w = rectangle_size[0]
        h = rectangle_size[1]

        if mode == "left":
            rectangle_vertices = [[x, y], [x, y + h]]
        elif mode == "right":
            rectangle_vertices = [[x + w, y], [x + w, y + h]]
        rectangle_vertices.extend(notch_points)
        if mode == "left":
            rectangle_vertices.extend([[x + w, y]])
        elif mode == "right":
            rectangle_vertices.extend([[x, y]])

        return rectangle_vertices

    @staticmethod
    def _points_on_circle(center, radius, start_angle, end_angle):
        points = []
        y_diff = False
        if end_angle >= 180:
            step = 1
            end_angle += 1
        elif end_angle <= 0:
            step = -1
            end_angle -= 1
        else:
            raise Exception("Invalid value for start angle")

        for degree in range(start_angle, end_angle, step):

            angle = radians(degree)
            x = center[0] + (radius * cos(angle))
            y = center[1] + (radius * sin(angle))

            if y_diff is False:
                y_diff = abs(y - center[1])

            y += y_diff
            points.append([x, y])

        return points


class MDTopAppBar(DeclarativeBehavior, NotchedBox, WindowController):
    """
    :Events:
        `on_action_button`
            Method for the button used for the :class:`~MDBottomAppBar` class.
    """

    left_action_items = ListProperty()
    """
    The icons on the left of the toolbar.
    To add one, append a list like the following:

    .. code-block:: kv

        MDTopAppBar:
            left_action_items: ["dots-vertical", callback, "tooltip text", "overflow text"]

    ``icon_name`` - is a string that corresponds to an icon definition:

    .. code-block:: kv

        MDTopAppBar:
            right_action_items: [["home"]]

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-icon.png
        :align: center

    ``callback`` - is the function called on a touch release event and:

    .. code-block:: kv

        MDTopAppBar:
            right_action_items: [["home", lambda x: app.callback(x)]]

    .. code-block:: python

        class Test(MDApp):
            def callback(self, instance_action_top_appbar_button):
                print(instance_action_top_appbar_button)

    ``tooltip text`` - is the text to be displayed in the tooltip:

    .. code-block:: kv

        MDTopAppBar:
            right_action_items:
                [
                ["home", lambda x: app.callback(x), "Home"],
                ["message-star", lambda x: app.callback(x), "Message star"],
                ["message-question", lambda x: app.callback(x), "Message question"],
                ["message-reply", lambda x: app.callback(x), "Message reply"],
                ]

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-tooltip-text.gif
        :align: center

    ``overflow text`` - is the text for menu items (:class:`~OverFlowMenuItem`)
    of the corresponding action buttons:

    .. code-block:: kv

        MDTopAppBar:
            right_action_items:
                [
                ["home", lambda x: app.callback(x), "", "Home"],
                ["message-star", lambda x: app.callback(x), "", "Message star"],
                ["message-question", lambda x: app.callback(x), "" , "Message question"],
                ["message-reply", lambda x: app.callback(x), "", "Message reply"],
                ]

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-overflow-text.png
        :align: center

    Both the ``callback`` and ``tooltip text`` and ``overflow text`` are
    optional but the order must be preserved.

    :attr:`left_action_items` is an :class:`~kivy.properties.ListProperty`
    and defaults to `[]`.
    """

    right_action_items = ListProperty()
    """
    The icons on the left of the toolbar.
    Works the same way as :attr:`left_action_items`.

    :attr:`right_action_items` is an :class:`~kivy.properties.ListProperty`
    and defaults to `[]`.
    """

    title = StringProperty()
    """
    Text toolbar.

    .. code-block:: kv

        MDTopAppBar:
            title: "MDTopAppBar"

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-title.png
        :align: center

    :attr:`title` is an :class:`~kivy.properties.StringProperty`
    and defaults to `''`.
    """

    mode = OptionProperty(
        "center", options=["free-end", "free-center", "end", "center"]
    )
    """
    Floating button position. Only for :class:`~MDBottomAppBar` class.
    Available options are: `'free-end'`, `'free-center'`, `'end'`, `'center'`.

    .. rubric:: Mode "end":

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                title: "Title"
                icon: "git"
                type: "bottom"
                left_action_items: [["menu", lambda x: x]]
                mode: "end"

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-9.png
        :align: center

    .. rubric:: Mode "free-end":

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                mode: "free-end"

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-10.png
        :align: center

    .. rubric:: Mode "free-center":

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                mode: "free-center"

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-free-center.png
        :align: center

    .. rubric:: Mode "center":

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                mode: "center"

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-center.png
        :align: center

    :attr:`mode` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `'center'`.
    """

    type = OptionProperty("top", options=["top", "bottom"])
    """
    When using the :class:`~MDBottomAppBar` class, the parameter ``type``
    must be set to `'bottom'`:

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                type: "bottom"

    Available options are: `'top'`, `'bottom'`.

    :attr:`type` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `'top'`.
    """

    opposite_colors = BooleanProperty(False)
    """
    Changes the color of the label to the color opposite to the main theme.

    .. code-block:: kv

        MDTopAppBar:
            opposite_colors: True

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-opposite-true.png
        :align: center

    .. code-block:: kv

        MDTopAppBar:
            opposite_colors: True

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-opposite-false.png
        :align: center
    """

    md_bg_bottom_color = ColorProperty(None)
    """
    The background color in (r, g, b, a) or string format for the toolbar with the
    ``bottom`` mode.

    .. versionadded:: 1.0.0

    .. code-block:: kv

        MDBottomAppBar:

            MDTopAppBar:
                md_bg_bottom_color: 0, 1, 0, 1
                icon_color: self.md_bg_bottom_color

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-md-bg-bottom-color.png
        :align: center

    :attr:`md_bg_bottom_color` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `None`.
    """

    set_bars_color = BooleanProperty(False)
    """
    If `True` the background color of the bar status will be set automatically
    according to the current color of the toolbar.

    .. versionadded:: 1.0.0

    See `set_bars_colors <https://kivymd.readthedocs.io/en/latest/api/kivymd/utils/set_bars_colors/>`
    for more information.

    :attr:`set_bars_color` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `False`.
    """

    use_overflow = BooleanProperty(False)
    """
    As a top app bar is resized, actions move to the overflow menu from right
    to left.

    .. versionadded:: 1.0.0

    .. code-block:: kv

        MDTopAppBar:
            title: "MDTopAppBar"
            use_overflow: True
            right_action_items:
                [
                ["home", lambda x: app.callback(x), "Home", "Home"],
                ["message-star", lambda x: app.callback(x), "Message star", "Message star"],
                ["message-question", lambda x: app.callback(x), "Message question", "Message question"],
                ["message-reply", lambda x: app.callback(x), "Message reply", "Message reply"],
                ]

    .. image:: https://github.com/HeaTTheatR/KivyMD-data/raw/master/gallery/kivymddoc/toolbar-use-overflow.gif
        :align: center

    :attr:`use_overflow` is an :class:`~kivy.properties.BooleanProperty`
    and defaults to `False`.
    """

    overflow_cls = ObjectProperty()
    """
    Must be an object of the :class:`~kivymd.uix.menu.MDDropdownMenu' class.
    See :class:`~kivymd.uix.menu.MDDropdownMenu` class documentation for more
    information.

    .. versionadded:: 1.0.0

    .. code-block:: python

        from kivy.lang import Builder

        from kivymd.app import MDApp
        from kivymd.uix.menu import MDDropdownMenu

        KV = '''
        #:import CustomOverFlowMenu __main__.CustomOverFlowMenu


        MDBoxLayout:
            orientation: "vertical"

            MDTopAppBar:
                title: "MDTopAppBar"
                use_overflow: True
                overflow_cls: CustomOverFlowMenu()
                right_action_items:
                    [
                    ["home", lambda x: app.callback(x), "Home", "Home"],
                    ["message-star", lambda x: app.callback(x), "Message star", "Message star"],
                    ["message-question", lambda x: app.callback(x), "Message question", "Message question"],
                    ["message-reply", lambda x: app.callback(x), "Message reply", "Message reply"],
                    ]

            MDLabel:
                text: "Content"
                halign: "center"
        '''


        class CustomOverFlowMenu(MDDropdownMenu):
            # In this class you can set custom properties for the overflow menu.
            pass


        class Test(MDApp):
            def build(self):
                return Builder.load_string(KV)

            def callback(self, instance_action_top_appbar_button):
                print(instance_action_top_appbar_button)


        Test().run()

    :attr:`overflow_cls` is an :class:`~kivy.properties.ObjectProperty`
    and defaults to `None`.
    """

    # Attributes only for the BottomAppBar class.

    icon = StringProperty()
    """
    Floating button. Only for :class:`~MDBottomAppBar` class.

    :attr:`icon` is an :class:`~kivy.properties.StringProperty`
    and defaults to `'android'`.
    """

    icon_color = ColorProperty()
    """
    Color in (r, g, b, a) or string format action button. Only for
    :class:`~MDBottomAppBar` class.

    :attr:`icon_color` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `[]`.
    """

    # MD3 Style attributes.

    anchor_title = OptionProperty(None, options=["left", "center", "right"])
    """
    Position toolbar title. Only used with `material_style = 'M3'`
    Available options are: `'left'`, `'center'`, `'right'`.

    :attr:`anchor_title` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `None`.
    """

    headline_text = StringProperty()
    """
    Headline text toolbar.

    .. versionadded:: 1.0.0

    :attr:`headline_text` is an :class:`~kivy.properties.StringProperty`
    and defaults to `''`.
    """

    headline_text_color = ColorProperty(None)
    """
    Headline text color in (r, g, b, a) or string format.

    .. versionadded:: 1.0.0

    :attr:`headline_text_color` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `None`.
    """

    type_height = OptionProperty("small", options=["medium", "large", "small"])
    """
    Toolbar height type.

    .. versionadded:: 1.0.0

    Available options are: 'small', 'large', 'small'.

    :attr:`type_height` is an :class:`~kivy.properties.OptionProperty`
    and defaults to `'small'`.
    """

    # List of action buttons (ActionTopAppBarButton instance) that have been
    # .added to the overflow
    _hidden_items = []
    # See `kivymd.uix.menu.MDDropdownMenu.items` attribute.
    _overflow_menu_items = []

    def __init__(self, **kwargs):
        self.action_button = ActionBottomAppBarButton()
        super().__init__(**kwargs)
        self.register_event_type("on_action_button")

        if not self.icon_color:
            self.icon_color = self.theme_cls.primary_color

        self.bind(specific_text_color=self.update_action_bar_text_colors)
        self.theme_cls.bind(
            material_style=self.update_bar_height,
            primary_palette=self.update_md_bg_color,
        )

        Clock.schedule_once(
            lambda x: self.on_left_action_items(0, self.left_action_items)
        )
        Clock.schedule_once(
            lambda x: self.on_right_action_items(0, self.right_action_items)
        )
        Clock.schedule_once(lambda x: self.set_md_bg_color(0, self.md_bg_color))
        Clock.schedule_once(lambda x: self.on_type_height(0, self.type_height))
        Clock.schedule_once(
            lambda x: self.update_anchor_title(self.theme_cls.material_style)
        )
        Clock.schedule_once(self.update_floating_radius)
        Clock.schedule_once(self.check_overflow_cls)

    def set_headline_font_style(self, interval: Union[int, float]) -> None:
        if self.type_height in ("medium", "large"):
            self.ids.label_headline.font_style = {
                "medium": "H6",
                "large": "H5",
            }[self.type_height]

    def on_width(self, instance_toolbar, width: float) -> None:
        """
        Called when the toolbar is resized (size of the application window).
        """

        if self.mode == "center":
            self.action_button.x = width / 2 - self.action_button.width / 2
        else:
            self.action_button.x = width - self.action_button.width * 2

        # The user reduces the width of the window.
        if (
            self.get_window_width_resizing_direction() == "left"
            and self.use_overflow
            and self.ids.label_title.is_shortened
        ):
            if not self.overflow_action_button_is_added():
                self.add_overflow_button()
            self.add_action_button_to_overflow()
        # The user increases the width of the window.
        if (
            self.get_window_width_resizing_direction() == "right"
            and self.use_overflow
            and not self.ids.label_title.is_shortened
            and self.overflow_cls.items
        ):
            self.return_action_button_to_toolbar()

    def return_action_button_to_toolbar(self) -> None:
        if len(self._hidden_items):
            action_button = self._hidden_items.pop()
            self.ids.right_actions.add_widget(action_button, index=1)
            self.update_overflow_menu_items(action_button)
            if not len(self._hidden_items):
                self.remove_overflow_button()

    def remove_overflow_button(self) -> None:
        """Removes an overflow button to the toolbar."""

        if self.overflow_action_button_is_added():
            action_overflow_button = self.ids.right_actions.children[0]
            self.ids.right_actions.remove_widget(action_overflow_button)
            self._overflow_menu_items = []

    def add_overflow_button(self) -> None:
        """Adds an overflow button to the toolbar."""

        self.ids.right_actions.add_widget(
            ActionOverFlowButton(
                theme_text_color="Custom"
                if not self.opposite_colors
                else "Primary",
                text_color=self.specific_text_color,
                opposite_colors=self.opposite_colors,
                on_release=lambda x: self.overflow_cls.open(),
            )
        )

    def overflow_action_button_is_added(self) -> bool:
        """
        Returns `True` if at least one action button
        (:class:`~ActionTopAppBarButton') on the toolbar is added to the
        overflow.
        """

        if (
            not self.ids.right_actions.children[0].__class__
            is ActionOverFlowButton
        ):
            return False
        return True

    def add_action_button_to_overflow(self):
        """Adds an overflow button to the toolbar."""

        if len(self.ids.right_actions.children) > 1:
            button_to_be_added = self.ids.right_actions.children[1]
            self._hidden_items.append(button_to_be_added)
            self.ids.right_actions.remove_widget(button_to_be_added)

            self._overflow_menu_items.append(
                {
                    "viewclass": "OverFlowMenuItem",
                    "icon": button_to_be_added.icon,
                    "text": button_to_be_added.overflow_text,
                    "height": dp(48),
                    "on_press": lambda *x: button_to_be_added.on_release(*x),
                }
            )
            self.overflow_cls.items = self._overflow_menu_items
            self.overflow_cls.caller = self.ids.right_actions.children[0]

    def check_overflow_cls(self, interval: Union[int, float]) -> None:
        """
        If the user does not set the :attr:`overflow_cls` attribute but uses
        overflows, the :attr:`overflow_cls` attribute will use the default
        value.
        """

        if not self.overflow_cls:
            self.overflow_cls = self.get_default_overflow_cls()

    def on_type(self, instance_toolbar, type_value: str) -> None:
        """Called when the value of the  :attr:`type` attribute changes."""

        if type_value == "bottom":
            self.action_button.bind(center_x=self.setter("notch_center_x"))
            self.action_button.bind(
                on_release=lambda x: self.dispatch("on_action_button")
            )
            self.action_button.x = (
                Window.width / 2 - self.action_button.width / 2
            )
            self.action_button.y = (
                (self.center[1] - self.height / 2)
                + self.theme_cls.standard_increment / 2
                + self._shift
            )
            self.shadow_offset = [0, 30]
            self.on_mode(None, self.mode)

    def on_type_height(self, instance_toolbar, height_type_value: str) -> None:
        """
        Called when the value of the  :attr:`type_height` attribute changes.
        """

        if self.theme_cls.material_style == "M2":
            self.height = self.theme_cls.standard_increment
        else:
            if self.type != "bottom":
                if height_type_value == "small":
                    self.height = dp(64)
                elif height_type_value == "medium":
                    self.height = dp(112)
                elif height_type_value == "large":
                    self.height = dp(152)
            else:
                self.height = self.theme_cls.standard_increment
        Clock.schedule_once(self.set_headline_font_style)

    def on_action_button(self, *args):
        """
        Method for the button used for the :class:`~MDBottomAppBar` class.
        """

    def on_overflow_cls(
        self, instance_toolbar, instance_overflow_cls: MDDropdownMenu
    ) -> None:
        """
        Called when the value of the  :attr:`overflow_cls` attribute changes.
        """

        self.overflow_cls = instance_overflow_cls

    def on_md_bg_color(self, instance_toolbar, color_value: list) -> None:
        """
        Called when the value of the  :attr:`md_bg_color` attribute changes.
        """

        def on_md_bg_color(interval: Union[int, float]):
            if self.type == "bottom":
                self.md_bg_color = [0, 0, 0, 0]
            else:
                if self.set_bars_color:
                    set_bars_colors(
                        color_value, None, self.theme_cls.theme_style
                    )

        Clock.schedule_once(on_md_bg_color)

    def on_left_action_items(self, instance_toolbar, items_value: list) -> None:
        """
        Called when the value of the  :attr:`left_action_items` attribute
        changes.
        """

        def on_left_action_items(interval: Union[int, float]):
            self.update_action_bar(self.ids.left_actions, items_value)

        Clock.schedule_once(on_left_action_items)

    def on_right_action_items(
        self, instance_toolbar, items_value: list
    ) -> None:
        """
        Called when the value of the  :attr:`right_action_items` attribute
        changes.
        """

        def on_right_actions(interval: Union[int, float]):
            self.update_action_bar(self.ids.right_actions, items_value)

        Clock.schedule_once(on_right_actions)

    def on_icon(self, instance_toolbar, icon_name: str) -> None:
        """Called when the value of the  :attr:`icon` attribute changes."""

        self.action_button.icon = icon_name

    def on_icon_color(self, instance, icon_name: str) -> None:
        """
        Called when the value of the  :attr:`icon_color` attribute changes.
        """

        self.action_button.md_bg_color = icon_name

    def on_md_bg_bottom_color(
        self, instance_toolbar, color_value: list
    ) -> None:
        """
        Called when the value of the  :attr:`md_bg_bottom_color` attribute
        changes.
        """

        set_bars_colors(None, color_value, self.theme_cls.theme_style)

    def on_anchor_title(self, instance_toolbar, anchor_value: str) -> None:
        """
        Called when the value of the  :attr:`anchor_title` attribute changes.
        """

        def on_anchor_title(interval: Union[int, float]):
            self.ids.label_title.halign = anchor_value

        Clock.schedule_once(on_anchor_title)

    def on_mode(self, instance_toolbar, mode_value: str) -> None:
        """Called when the value of the  :attr:`made` attribute changes."""

        if self.type == "top":
            return

        def on_mode(interval: Union[int, float]):
            def set_button_pos(*args):
                self.action_button.x = x
                self.action_button.y = y - self._rounded_rectangle_height / 2
                self.action_button._hard_shadow_size = (0, 0)
                self.action_button._soft_shadow_size = (0, 0)
                anim = Animation(
                    scale_value_x=1, scale_value_y=1, scale_value_z=1, d=0.05
                )
                anim.bind(on_complete=self.set_shadow)
                anim.start(self.action_button)

            if mode_value == "center":
                self.set_notch()
                x = Window.width / 2 - self.action_button.width / 2
                y = (
                    (self.center[1] - self.height / 2)
                    + self.theme_cls.standard_increment / 2
                    + self._shift
                )
            elif mode_value == "end":
                self.set_notch()
                x = Window.width - self.action_button.width * 2
                y = (
                    (self.center[1] - self.height / 2)
                    + self.theme_cls.standard_increment / 2
                    + self._shift
                )
                self.right_action_items = []
            elif mode_value == "free-end":
                self.remove_notch()
                x = Window.width - self.action_button.width - dp(10)
                y = self.action_button.height + self.action_button.height / 2
            elif mode_value == "free-center":
                self.remove_notch()
                x = Window.width / 2 - self.action_button.width / 2
                y = self.action_button.height + self.action_button.height / 2
            self.remove_shadow()
            anim = Animation(
                scale_value_x=0, scale_value_y=0, scale_value_z=0, d=0.1
            )
            anim.bind(on_complete=set_button_pos)
            anim.start(self.action_button)

        Clock.schedule_once(on_mode)

    def set_md_bg_color(self, instance_toolbar, color_value: list) -> None:
        if color_value == [1.0, 1.0, 1.0, 0.0]:
            self.md_bg_color = self.theme_cls.primary_color

    def set_notch(self) -> None:
        anim = Animation(d=0.1) + Animation(
            notch_radius=self.action_button.width / 2 + dp(8),
            d=0.1,
        )
        anim.start(self)

    def set_shadow(self, *args) -> None:
        self.action_button._elevation = self.action_button.elevation

    def get_default_overflow_cls(self) -> OverFlowMenu:
        return OverFlowMenu(width_mult=4)

    def update_overflow_menu_items(self, action_button) -> None:
        for data in self.overflow_cls.items:
            if data["icon"] == action_button.icon:
                self.overflow_cls.items.remove(data)
                break

    def update_bar_height(
        self, instance_theme_manager, material_style_value: str
    ) -> None:
        self.on_type_height(self, self.type_height)
        self.update_anchor_title(material_style_value)

    def update_floating_radius(self, interval: Union[int, float]) -> None:
        self.action_button.radius = self.action_button.width / 2

    def update_anchor_title(self, material_style_value: str) -> str:
        if material_style_value == "M2":
            self.anchor_title = "left"
        elif material_style_value == "M3" and self.type != "bottom":
            if not self.anchor_title:
                self.anchor_title = "center"
        elif material_style_value == "M3" and self.type == "bottom":
            self.anchor_title = "left"
        return self.anchor_title

    def update_action_bar(
        self, instance_box_layout, action_bar_items: list
    ) -> None:
        instance_box_layout.clear_widgets()
        new_width = 0

        for item in action_bar_items:
            new_width += dp(48)
            if len(item) == 1:
                item.append(lambda x: None)
            if len(item) > 1 and not item[1]:
                item[1] = lambda x: None
            if len(item) == 2:
                if type(item[1]) is str:
                    item.insert(1, lambda x: None)
                else:
                    item.append("")

            instance_box_layout.add_widget(
                ActionTopAppBarButton(
                    icon=item[0],
                    on_release=item[1],
                    tooltip_text=item[2],
                    overflow_text=item[3] if len(item) == 4 else "",
                    theme_text_color="Custom"
                    if not self.opposite_colors
                    else "Primary",
                    text_color=self.specific_text_color,
                    opposite_colors=self.opposite_colors,
                )
            )

        instance_box_layout.width = new_width

    def update_md_bg_color(self, *args) -> None:
        self.md_bg_color = self.theme_cls._get_primary_color()

    def update_action_bar_text_colors(self, *args) -> None:
        for child in self.ids.left_actions.children:
            child.text_color = self.specific_text_color
        for child in self.ids.right_actions.children:
            child.text_color = self.specific_text_color

    def remove_notch(self) -> None:
        anim = Animation(d=0.1) + Animation(notch_radius=0, d=0.1)
        anim.start(self)

    def remove_shadow(self) -> None:
        self.action_button._elevation = 0

    def _update_specific_text_color(self, instance, value):
        if self.specific_text_color in (
            [0.0, 0.0, 0.0, 0.87],
            [0.0, 0.0, 0.0, 1.0],
            [1.0, 1.0, 1.0, 1.0],
        ):
            self.specific_text_color = text_colors[
                self.theme_cls.primary_palette
            ][self.theme_cls.primary_hue]


class MDBottomAppBar(DeclarativeBehavior, FloatLayout):
    md_bg_color = ColorProperty([0, 0, 0, 0])
    """
    Color toolbar in (r, g, b, a) or string format.

    :attr:`md_bg_color` is an :class:`~kivy.properties.ColorProperty`
    and defaults to `[0, 0, 0, 0]`.
    """

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.size_hint_y = None

    def add_widget(self, widget, index=0, canvas=None):
        if isinstance(widget, MDTopAppBar):
            super().add_widget(widget)
            return super().add_widget(widget.action_button)
