"""gr.Slider() component."""

from __future__ import annotations

import math
from collections.abc import Sequence
from typing import Any, Callable, Tuple, Union


from gradio.components.base import FormComponent
from gradio.events import Events

from gradio.data_classes import GradioRootModel

class RangeSliderData(GradioRootModel):
    root: Tuple[Union[float, None], Union[float, None]]


class RangeSlider(FormComponent):
    """
    A slider component that allows the user to select a range of values.
    """

    EVENTS = [Events.change, Events.input, Events.release]
    data_model = RangeSliderData

    def __init__(
        self,
        minimum: float = 0,
        maximum: float = 100,
        value: Tuple[float, float] | Callable | None = None,
        *,
        step: float | None = None,
        label: str | None = None,
        info: str | None = None,
        every: float | None = None,
        show_label: bool | None = None,
        container: bool = True,
        scale: int | None = None,
        min_width: int = 160,
        interactive: bool | None = None,
        visible: bool = True,
        elem_id: str | None = None,
        elem_classes: list[str] | str | None = None,
        render: bool = True,
    ):
        """
        Parameters:
            minimum: minimum value for slider.
            maximum: maximum value for slider.
            value: default value. If callable, the function will be called whenever the app loads to set the initial value of the component. Ignored if randomized=True.
            step: increment between slider values.
            label: The label for this component. Appears above the component and is also used as the header if there are a table of examples for this component. If None and used in a `gr.Interface`, the label will be the name of the parameter this component is assigned to.
            info: additional component description.
            every: If `value` is a callable, run the function 'every' number of seconds while the client connection is open. Has no effect otherwise. The event can be accessed (e.g. to cancel it) via this component's .load_event attribute.
            show_label: if True, will display label.
            container: If True, will place the component in a container - providing some extra padding around the border.
            scale: relative size compared to adjacent Components. For example if Components A and B are in a Row, and A has scale=2, and B has scale=1, A will be twice as wide as B. Should be an integer. scale applies in Rows, and to top-level Components in Blocks where fill_height=True.
            min_width: minimum pixel width, will wrap if not sufficient screen space to satisfy this value. If a certain scale value results in this Component being narrower than min_width, the min_width parameter will be respected first.
            interactive: if True, slider will be adjustable; if False, adjusting will be disabled. If not provided, this is inferred based on whether the component is used as an input or output.
            visible: If False, component will be hidden.
            elem_id: An optional string that is assigned as the id of this component in the HTML DOM. Can be used for targeting CSS styles.
            elem_classes: An optional list of strings that are assigned as the classes of this component in the HTML DOM. Can be used for targeting CSS styles.
            render: If False, component will not render be rendered in the Blocks context. Should be used if the intention is to assign event listeners now but render the component later.
        """
        self.minimum = minimum
        self.maximum = maximum
        if step is None:
            difference = maximum - minimum
            power = math.floor(math.log10(difference) - 2)
            self.step = 10**power
        else:
            self.step = step

        super().__init__(
            label=label,
            info=info,
            every=every,
            show_label=show_label,
            container=container,
            scale=scale,
            min_width=min_width,
            interactive=interactive,
            visible=visible,
            elem_id=elem_id,
            elem_classes=elem_classes,
            render=render,
            value=value,
        )

    def example_payload(self) -> Any:
        return [self.minimum, self.maximum]

    def example_value(self) -> Any:
        return [self.minimum, self.maximum]

    def postprocess(self, value: Tuple[float, float] | None) -> RangeSliderData:
        """
        Parameters:
            value: Expects an {int} or {float} returned from function and sets slider value to it as long as it is within range (otherwise, sets to minimum value).
        Returns:
            The value of the slider within the range.
        """
        if value is None:
            return RangeSliderData(root=(self.minimum, self.maximum))
        if not isinstance(value, Sequence) and len(value) != 2:
            raise ValueError("Value must be a tuple of two numbers")
        return RangeSliderData(root=(max(self.minimum, min(value[0], self.maximum)), max(self.minimum, min(value[1], self.maximum))))

    def preprocess(self, payload: RangeSliderData) -> Tuple[float, float]:
        """
        Parameters:
            payload: slider value
        Returns:
            Passes slider value as a {float} into the function.
        """
        return payload.model_dump()