# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2026)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import annotations

from dataclasses import dataclass
from textwrap import dedent
from typing import TYPE_CHECKING, cast

from streamlit.elements.lib.form_utils import current_form_id
from streamlit.elements.lib.layout_utils import (
    Width,
    create_layout_config,
)
from streamlit.elements.lib.policies import (
    check_widget_policies,
    maybe_raise_label_warnings,
)
from streamlit.elements.lib.utils import (
    Key,
    LabelVisibility,
    compute_and_register_element_id,
    get_label_visibility_proto_value,
    to_key,
)
from streamlit.proto.Checkbox_pb2 import Checkbox as CheckboxProto
from streamlit.runtime.metrics_util import gather_metrics
from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
from streamlit.runtime.state import (
    BindOption,
    PersistStateOption,
    WidgetArgs,
    WidgetCallback,
    WidgetKwargs,
    register_widget,
)

if TYPE_CHECKING:
    from streamlit.delta_generator import DeltaGenerator


@dataclass
class CheckboxSerde:
    value: bool

    def serialize(self, v: bool) -> bool:
        return bool(v)

    def deserialize(self, ui_value: bool | None) -> bool:
        return bool(ui_value if ui_value is not None else self.value)


class CheckboxMixin:
    @gather_metrics("checkbox")
    def checkbox(
        self,
        label: str,
        value: bool = False,
        key: Key | None = None,
        help: str | None = None,
        on_change: WidgetCallback | None = None,
        args: WidgetArgs | None = None,
        kwargs: WidgetKwargs | None = None,
        *,  # keyword-only arguments:
        disabled: bool = False,
        label_visibility: LabelVisibility = "visible",
        width: Width = "content",
        wrap: bool | None = None,
        bind: BindOption = None,
        persist_state: PersistStateOption = None,
    ) -> bool:
        r"""Display a checkbox widget.

        Parameters
        ----------
        label : str
            A short label explaining to the user what this checkbox is for.
            The label can optionally contain GitHub-flavored Markdown of the
            following types: Bold, Italics, Strikethroughs, Inline Code, Links,
            and Images. Images display like icons, with a max height equal to
            the font height.

            Unsupported Markdown elements are unwrapped so only their children
            (text contents) render. Common block-level Markdown (headings,
            lists, blockquotes) is automatically escaped and displays as
            literal text in labels.

            See the ``body`` parameter of |st.markdown|_ for additional,
            supported Markdown directives.

            For accessibility reasons, you should never set an empty label, but
            you can hide it with ``label_visibility`` if needed. In the future,
            we may disallow empty labels by raising an exception.

            .. |st.markdown| replace:: ``st.markdown``
            .. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown

        value : bool
            Preselect the checkbox when it first renders. This will be
            cast to bool internally.

        key : str, int, or None
            An optional string or integer to use as the unique key for
            the widget. If this is ``None`` (default), a key will be
            generated for the widget based on the values of the other
            parameters. No two widgets may have the same key. Assigning
            a key stabilizes the widget's identity and preserves its
            state across reruns even when other parameters change.

            A key lets you read or update the widget's value via
            ``st.session_state[key]``. For more details, see `Widget
            behavior <https://docs.streamlit.io/develop/concepts/architecture/widget-behavior>`_.

            Additionally, if ``key`` is provided, it will be used as a
            CSS class name prefixed with ``st-key-``.

        help : str or None
            A tooltip that gets displayed next to the widget label. Streamlit
            only displays the tooltip when ``label_visibility="visible"``. If
            this is ``None`` (default), no tooltip is displayed.

            The tooltip can optionally contain GitHub-flavored Markdown,
            including the Markdown directives described in the ``body``
            parameter of ``st.markdown``.

        on_change : callable
            An optional callback invoked when this checkbox's value changes.

        args : list or tuple
            An optional list or tuple of args to pass to the callback.

        kwargs : dict
            An optional dict of kwargs to pass to the callback.

        disabled : bool
            An optional boolean that disables the checkbox if set to ``True``.
            The default is ``False``.

        label_visibility : "visible", "hidden", or "collapsed"
            The visibility of the label. The default is ``"visible"``. If this
            is ``"hidden"``, Streamlit displays an empty spacer instead of the
            label, which can help keep the widget aligned with other widgets.
            If this is ``"collapsed"``, Streamlit displays no label or spacer.

        width : "content", "stretch", or int
            The width of the checkbox widget. This can be one of the following:

            - ``"content"`` (default): The width of the widget matches the
              width of its content, but doesn't exceed the width of the parent
              container.
            - ``"stretch"``: The width of the widget matches the width of the
              parent container.
            - An integer specifying the width in pixels: The widget has a
              fixed width. If the specified width is greater than the width of
              the parent container, the width of the widget matches the width
              of the parent container.

        wrap : bool or None
            Whether the checkbox label can wrap onto multiple lines. This can be
            one of the following:

            - ``None`` (default): Streamlit decides based on the surrounding
              layout. Inside a horizontal container, the checkbox keeps its
              standard, single-row height and truncates an overflowing label
              with an ellipsis; in other layouts, the label wraps onto
              additional lines.
            - ``True``: If the label is too wide for the checkbox, it wraps onto
              additional lines and the widget grows taller.
            - ``False``: The checkbox keeps its standard, single-row height. A
              label that is too wide is truncated with an ellipsis.

            When the checkbox keeps a single-row label, hovering the label
            reveals the full label in a tooltip, including when ``help`` is set.
            The checkbox indicator and help icon remain visible.

        bind : "query-params" or None
            Binding mode for syncing the widget's value with a URL query
            parameter. If this is ``None`` (default), the widget's value
            is not synced to the URL. When this is set to
            ``"query-params"``, changes to the widget update the URL, and
            the widget can be initialized or updated through a query
            parameter in the URL. This requires ``key`` to be set. The
            key is used as the query parameter name.

            When the widget's value equals its default, the query
            parameter is removed from the URL to keep it clean. A bound
            query parameter can't be set or deleted through
            ``st.query_params``; it can only be programmatically changed
            through ``st.session_state``.

        persist_state : "page", "session", or None
            How long to preserve the widget's value when it isn't rendered.
            If this is ``None`` (default), the value is lost when the widget
            stops being rendered or the user switches pages. If this is
            ``"page"``, the value is preserved only while the user stays on the
            page where the widget is defined (for example, while the widget is
            conditionally hidden); it is discarded on a page switch and is not
            restored if the user returns to the page. If this is ``"session"``,
            the value is preserved for the entire session, including across
            page switches, so it returns when the user navigates back. This
            requires ``key`` to be set. If ``bind="query-params"`` is also set,
            the binding takes precedence: the value is stored in the URL, so it
            persists across page switches regardless of the ``persist_state``
            scope.

        Returns
        -------
        bool
            Whether or not the checkbox is checked.

        Examples
        --------
        >>> import streamlit as st
        >>>
        >>> agree = st.checkbox("I agree")
        >>>
        >>> if agree:
        ...     st.write("Great!")

        .. output::
           https://doc-checkbox.streamlit.app/
           height: 220px

        """
        ctx = get_script_run_ctx()
        return self._checkbox(
            label=label,
            value=value,
            key=key,
            help=help,
            on_change=on_change,
            args=args,
            kwargs=kwargs,
            disabled=disabled,
            label_visibility=label_visibility,
            type=CheckboxProto.StyleType.DEFAULT,
            ctx=ctx,
            width=width,
            wrap=wrap,
            bind=bind,
            persist_state=persist_state,
        )

    @gather_metrics("toggle")
    def toggle(
        self,
        label: str,
        value: bool = False,
        key: Key | None = None,
        help: str | None = None,
        on_change: WidgetCallback | None = None,
        args: WidgetArgs | None = None,
        kwargs: WidgetKwargs | None = None,
        *,  # keyword-only arguments:
        disabled: bool = False,
        label_visibility: LabelVisibility = "visible",
        width: Width = "content",
        wrap: bool | None = None,
        bind: BindOption = None,
        persist_state: PersistStateOption = None,
    ) -> bool:
        r"""Display a toggle widget.

        Parameters
        ----------
        label : str
            A short label explaining to the user what this toggle is for.
            The label can optionally contain GitHub-flavored Markdown of the
            following types: Bold, Italics, Strikethroughs, Inline Code, Links,
            and Images. Images display like icons, with a max height equal to
            the font height.

            Unsupported Markdown elements are unwrapped so only their children
            (text contents) render. Common block-level Markdown (headings,
            lists, blockquotes) is automatically escaped and displays as
            literal text in labels.

            See the ``body`` parameter of |st.markdown|_ for additional,
            supported Markdown directives.

            For accessibility reasons, you should never set an empty label, but
            you can hide it with ``label_visibility`` if needed. In the future,
            we may disallow empty labels by raising an exception.

            .. |st.markdown| replace:: ``st.markdown``
            .. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown

        value : bool
            Preselect the toggle when it first renders. This will be
            cast to bool internally.

        key : str, int, or None
            An optional string or integer to use as the unique key for
            the widget. If this is ``None`` (default), a key will be
            generated for the widget based on the values of the other
            parameters. No two widgets may have the same key. Assigning
            a key stabilizes the widget's identity and preserves its
            state across reruns even when other parameters change.

            A key lets you read or update the widget's value via
            ``st.session_state[key]``. For more details, see `Widget
            behavior <https://docs.streamlit.io/develop/concepts/architecture/widget-behavior>`_.

            Additionally, if ``key`` is provided, it will be used as a
            CSS class name prefixed with ``st-key-``.

        help : str or None
            A tooltip that gets displayed next to the widget label. Streamlit
            only displays the tooltip when ``label_visibility="visible"``. If
            this is ``None`` (default), no tooltip is displayed.

            The tooltip can optionally contain GitHub-flavored Markdown,
            including the Markdown directives described in the ``body``
            parameter of ``st.markdown``.

        on_change : callable
            An optional callback invoked when this toggle's value changes.

        args : list or tuple
            An optional list or tuple of args to pass to the callback.

        kwargs : dict
            An optional dict of kwargs to pass to the callback.

        disabled : bool
            An optional boolean that disables the toggle if set to ``True``.
            The default is ``False``.

        label_visibility : "visible", "hidden", or "collapsed"
            The visibility of the label. The default is ``"visible"``. If this
            is ``"hidden"``, Streamlit displays an empty spacer instead of the
            label, which can help keep the widget aligned with other widgets.
            If this is ``"collapsed"``, Streamlit displays no label or spacer.

        width : "content", "stretch", or int
            The width of the toggle widget. This can be one of the following:

            - ``"content"`` (default): The width of the widget matches the
              width of its content, but doesn't exceed the width of the parent
              container.
            - ``"stretch"``: The width of the widget matches the width of the
              parent container.
            - An integer specifying the width in pixels: The widget has a
              fixed width. If the specified width is greater than the width of
              the parent container, the width of the widget matches the width
              of the parent container.

        wrap : bool or None
            Whether the toggle label can wrap onto multiple lines. This can be
            one of the following:

            - ``None`` (default): Streamlit decides based on the surrounding
              layout. Inside a horizontal container, the toggle keeps its
              standard, single-row height and truncates an overflowing label
              with an ellipsis; in other layouts, the label wraps onto
              additional lines.
            - ``True``: If the label is too wide for the toggle, it wraps onto
              additional lines and the widget grows taller.
            - ``False``: The toggle keeps its standard, single-row height. A
              label that is too wide is truncated with an ellipsis.

            When the toggle keeps a single-row label, hovering the label reveals
            the full label in a tooltip, including when ``help`` is set. The
            toggle switch and help icon remain visible.

        bind : "query-params" or None
            Binding mode for syncing the widget's value with a URL query
            parameter. If this is ``None`` (default), the widget's value
            is not synced to the URL. When this is set to
            ``"query-params"``, changes to the widget update the URL, and
            the widget can be initialized or updated through a query
            parameter in the URL. This requires ``key`` to be set. The
            key is used as the query parameter name.

            When the widget's value equals its default, the query
            parameter is removed from the URL to keep it clean. A bound
            query parameter can't be set or deleted through
            ``st.query_params``; it can only be programmatically changed
            through ``st.session_state``.

        persist_state : "page", "session", or None
            How long to preserve the widget's value when it isn't rendered.
            If this is ``None`` (default), the value is lost when the widget
            stops being rendered or the user switches pages. If this is
            ``"page"``, the value is preserved only while the user stays on the
            page where the widget is defined (for example, while the widget is
            conditionally hidden); it is discarded on a page switch and is not
            restored if the user returns to the page. If this is ``"session"``,
            the value is preserved for the entire session, including across
            page switches, so it returns when the user navigates back. This
            requires ``key`` to be set. If ``bind="query-params"`` is also set,
            the binding takes precedence: the value is stored in the URL, so it
            persists across page switches regardless of the ``persist_state``
            scope.

        Returns
        -------
        bool
            Whether or not the toggle is checked.

        Examples
        --------
        >>> import streamlit as st
        >>>
        >>> on = st.toggle("Activate feature")
        >>>
        >>> if on:
        ...     st.write("Feature activated!")

        .. output::
           https://doc-toggle.streamlit.app/
           height: 220px

        """
        ctx = get_script_run_ctx()
        return self._checkbox(
            label=label,
            value=value,
            key=key,
            help=help,
            on_change=on_change,
            args=args,
            kwargs=kwargs,
            disabled=disabled,
            label_visibility=label_visibility,
            type=CheckboxProto.StyleType.TOGGLE,
            ctx=ctx,
            width=width,
            wrap=wrap,
            bind=bind,
            persist_state=persist_state,
        )

    def _checkbox(
        self,
        label: str,
        value: bool = False,
        key: Key | None = None,
        help: str | None = None,
        on_change: WidgetCallback | None = None,
        args: WidgetArgs | None = None,
        kwargs: WidgetKwargs | None = None,
        *,  # keyword-only arguments:
        disabled: bool = False,
        label_visibility: LabelVisibility = "visible",
        type: CheckboxProto.StyleType.ValueType = CheckboxProto.StyleType.DEFAULT,
        ctx: ScriptRunContext | None = None,
        width: Width = "content",
        wrap: bool | None = None,
        bind: BindOption = None,
        persist_state: PersistStateOption = None,
    ) -> bool:
        key = to_key(key)

        check_widget_policies(
            self.dg,
            key,
            on_change,
            default_value=None if value is False else value,
        )
        maybe_raise_label_warnings(label, label_visibility)

        element_id = compute_and_register_element_id(
            "toggle" if type == CheckboxProto.StyleType.TOGGLE else "checkbox",
            user_key=key,
            key_as_main_identity=True,
            dg=self.dg,
            label=label,
            value=bool(value),
            help=help,
            width=width,
        )

        checkbox_proto = CheckboxProto()
        checkbox_proto.id = element_id
        checkbox_proto.label = label
        checkbox_proto.default = bool(value)
        checkbox_proto.type = type
        checkbox_proto.form_id = current_form_id(self.dg)
        checkbox_proto.disabled = disabled
        checkbox_proto.label_visibility.value = get_label_visibility_proto_value(
            label_visibility
        )

        if help is not None:
            checkbox_proto.help = dedent(help)

        # wrap is layout-only, so it is intentionally excluded from the element
        # id above. Leaving it unset lets the frontend resolve the auto default
        # from the surrounding layout.
        if wrap is not None:
            checkbox_proto.wrap = wrap

        # Set query param key if bound
        if bind == "query-params" and key is not None:
            checkbox_proto.query_param_key = str(key)

        layout_config = create_layout_config(width=width, allow_content_width=True)

        serde = CheckboxSerde(value)

        checkbox_state = register_widget(
            checkbox_proto.id,
            on_change_handler=on_change,
            args=args,
            kwargs=kwargs,
            deserializer=serde.deserialize,
            serializer=serde.serialize,
            ctx=ctx,
            value_type="bool_value",
            disabled=disabled,
            bind=bind,
            persist_state=persist_state,
            # Checkbox/toggle is not clearable (always true or false)
            clearable=False,
        )

        if checkbox_state.value_changed:
            checkbox_proto.value = checkbox_state.value
            checkbox_proto.set_value = True

        self.dg._enqueue(
            "checkbox",
            checkbox_proto,
            layout_config=layout_config,
            has_one_shot_effect=checkbox_state.value_changed,
        )
        return checkbox_state.value

    @property
    def dg(self) -> DeltaGenerator:
        """The associated DeltaGenerator."""
        return cast("DeltaGenerator", self)
