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use dioxus::prelude::*;
use freya_elements::elements as dioxus_elements;
use freya_hooks::{
    use_animation,
    use_applied_theme,
    AnimNum,
    Ease,
    Function,
    SnackBarTheme,
    SnackBarThemeWith,
};

/// `SnackBar` component. Use in combination with other components.
///
/// # Styling
/// Inherits the [`SnackBarTheme`](freya_hooks::SnackBarTheme) theme.
///
/// # Example
///
/// ```no_run
/// # use freya::prelude::*;
/// fn app() -> Element {
///     let mut show = use_signal(|| false);
///
///     rsx!(
///         rect {
///             height: "100%",
///             width: "100%",
///             Button {
///                 onpress: move |_| show.toggle(),
///                 label { "Open" }
///             }
///             SnackBar {
///                 show,
///                 label {
///                     "Hello, World!"
///                 }
///             }
///         }
///     )
/// }
/// ```
#[allow(non_snake_case)]
#[component]
pub fn SnackBar(
    /// Inner children of the SnackBar.
    children: Element,
    /// Signal to show the snackbar or not.
    show: Signal<bool>,
    /// Theme override.
    theme: Option<SnackBarThemeWith>,
) -> Element {
    let animation = use_animation(|ctx| {
        ctx.with(
            AnimNum::new(50., 0.)
                .time(200)
                .ease(Ease::Out)
                .function(Function::Expo),
        )
    });

    use_effect(move || {
        if *show.read() {
            animation.start();
        } else if animation.peek_has_run_yet() {
            animation.reverse();
        }
    });

    let offset_y = animation.get().read().as_f32();

    rsx!(
        rect {
            width: "100%",
            height: "40",
            position: "absolute",
            position_bottom: "0",
            offset_y: "{offset_y}",
            overflow: "clip",
            SnackBarBox {
                theme,
                {children}
            }
        }
    )
}

#[doc(hidden)]
#[allow(non_snake_case)]
#[component]
pub fn SnackBarBox(children: Element, theme: Option<SnackBarThemeWith>) -> Element {
    let SnackBarTheme { background, color } = use_applied_theme!(&theme, snackbar);

    rsx!(
        rect {
            width: "fill",
            height: "40",
            background: "{background}",
            overflow: "clip",
            padding: "10",
            color: "{color}",
            direction: "horizontal",
            {children}
        }
    )
}

#[cfg(test)]
mod test {
    use std::time::Duration;

    use dioxus::prelude::use_signal;
    use freya::prelude::*;
    use freya_testing::prelude::*;
    use tokio::time::sleep;

    #[tokio::test]
    pub async fn snackbar() {
        fn snackbar_app() -> Element {
            let mut show = use_signal(|| false);

            rsx!(
                rect {
                    height: "100%",
                    width: "100%",
                    Button {
                        onpress: move |_|  show.toggle(),
                        label { "Open" }
                    }
                    SnackBar {
                        show,
                        label {
                            "Hello, World!"
                        }
                    }
                }
            )
        }

        let mut utils = launch_test(snackbar_app);
        let root = utils.root();
        let snackbar_box = root.get(0).get(1).get(0);
        utils.wait_for_update().await;

        // Snackbar is closed.
        assert!(!snackbar_box.is_visible());

        // Open the snackbar by clicking at the button
        utils.push_event(PlatformEvent::Mouse {
            name: EventName::Click,
            cursor: (15.0, 15.0).into(),
            button: Some(MouseButton::Left),
        });

        // Wait a bit for the snackbar to show up
        utils.wait_for_update().await;
        utils.wait_for_update().await;
        sleep(Duration::from_millis(15)).await;
        utils.wait_for_update().await;

        // Snackbar is visible.
        assert!(snackbar_box.is_visible());
    }
}