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use dioxus::prelude::*;
use freya_elements::elements as dioxus_elements;
use freya_elements::events::{MouseEvent, WheelEvent};
use freya_hooks::{use_get_theme, use_node_ref};

/// [`Slider`] component properties.
#[derive(Props)]
pub struct SliderProps<'a> {
    /// Handler for the `onmoved` event.
    pub onmoved: EventHandler<'a, f64>,
    /// Width of the Slider.
    pub width: f64,
    /// Height of the Slider.
    pub value: f64,
}

#[inline]
fn ensure_correct_slider_range(value: f64) -> f64 {
    if value < 0.0 {
        // TODO: Better logging
        println!("Slider value is less than 0.0, setting to 0.0");
        0.0
    } else if value > 100.0 {
        println!("Slider value is greater than 100.0, setting to 100.0");
        100.0
    } else {
        value
    }
}

/// Controlled `Slider` component.
///
/// You must pass a percentage from 0.0 to 100.0 and listen for value changes with `onmoved` and then decide if this changes are applicable,
/// and if so, apply them.
///
/// # Props
/// See [`SliderProps`].
///
/// # Styling
/// Inherits a [`SliderTheme`](freya_hooks::SliderTheme) theme.
///
/// # Example
/// ```no_run
/// # use freya::prelude::*;
/// fn app(cx: Scope) -> Element {
///     let percentage = use_state(cx, || 20.0);
///
///     render!(
///         label {
///             "Value: {percentage}"
///         }
///         Slider {
///             width: 100.0,
///             value: *percentage.get(),
///             onmoved: |p| {
///                 percentage.set(p);
///             }
///         }
///     )
/// }
/// ```
#[allow(non_snake_case)]
pub fn Slider<'a>(cx: Scope<'a, SliderProps>) -> Element<'a> {
    let theme = use_get_theme(cx);
    let theme = &theme.slider;
    let hovering = use_state(cx, || false);
    let clicking = use_state(cx, || false);
    let value = ensure_correct_slider_range(cx.props.value);
    let (node_reference, size) = use_node_ref(cx);
    let width = cx.props.width + 14.0;

    let progress = (value / 100.0) * cx.props.width + 0.5;

    let onmouseleave = |_: MouseEvent| {
        if !(*clicking.get()) {
            hovering.set(false);
        }
    };

    let onmouseover = move |e: MouseEvent| {
        hovering.set(true);
        if *clicking.get() {
            let coordinates = e.get_element_coordinates();
            let mut x = coordinates.x - 7.5 - size.read().area.min_x() as f64;
            x = x.clamp(0.0, width);

            let mut percentage = x / cx.props.width * 100.0;
            percentage = percentage.clamp(0.0, 100.0);

            cx.props.onmoved.call(percentage);
        }
    };

    let onmousedown = |_: MouseEvent| {
        clicking.set(true);
    };

    let onclick = |_: MouseEvent| {
        clicking.set(false);
    };

    let onwheel = move |e: WheelEvent| {
        let wheel_y = e.get_delta_y();
        let progress_x = (value / 100.0) * cx.props.width;

        let mut x = progress_x + (wheel_y * 7.5);
        x = x.clamp(0.0, width);

        let mut percentage = x / cx.props.width * 100.0;
        percentage = percentage.clamp(0.0, 100.0);

        cx.props.onmoved.call(percentage);
    };

    render!(
        rect {
            reference: node_reference,
            width: "{width}",
            height: "20",
            onmousedown: onmousedown,
            onglobalclick: onclick,
            onglobalmouseover: onmouseover,
            onmouseleave: onmouseleave,
            onwheel: onwheel,
            display: "center",
            direction: "both",
            padding: "1",
            rect {
                background: "{theme.background}",
                width: "100%",
                height: "6",
                direction: "horizontal",
                corner_radius: "50",
                rect {
                    background: "{theme.thumb_inner_background}",
                    width: "{progress}",
                    height: "100%",
                    corner_radius: "50",
                }
                rect {
                    width: "{progress}",
                    height: "100%",
                    offset_y: "-5",
                    offset_x: "-2",
                    rect {
                        background: "{theme.thumb_background}",
                        width: "17",
                        height: "17",
                        corner_radius: "50",
                        padding: "3",
                        rect {
                            height: "100%",
                            width: "100%",
                            background: "{theme.thumb_inner_background}",
                            corner_radius: "50"
                        }
                    }
                }
            }
        }
    )
}