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//! Back-end agnostic controller events.

use crate::{Event, Input, Motion};

/// Components of a controller button event. Not guaranteed consistent across
/// backends.
#[derive(Copy, Clone, Deserialize, Serialize, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct ControllerButton {
    /// Which controller was the button on.
    pub id: u32,
    /// Which button was pressed.
    pub button: u8,
}

impl ControllerButton {
    /// Create a new `ControllerButton` object. Intended for use by backends when
    /// emitting events.
    pub fn new(id: u32, button: u8) -> Self {
        ControllerButton { id, button }
    }
}

/// Components of a controller hat move event (d-Pad).
#[derive(Copy, Clone, Deserialize, Serialize, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct ControllerHat {
    /// Which Controller was the button on.
    pub id: u32,
    /// Which button was pressed.
    pub state: crate::HatState,
    /// Which hat on the controller was changed
    pub which: u8,
}

impl ControllerHat {
    /// Create a new `ControllerButton` object. Intended for use by backends when
    /// emitting events.
    pub fn new(id: u32, which: u8, state: crate::HatState) -> Self {
        ControllerHat { id, state, which }
    }
}

/// Components of a controller axis move event. Not guaranteed consistent across
/// backends.
#[derive(Copy, Clone, Deserialize, Serialize, PartialEq, PartialOrd, Debug)]
pub struct ControllerAxisArgs {
    /// Which controller moved.
    pub id: u32,
    /// The axis that moved.
    pub axis: u8,
    /// Position of the controller. Usually [-1.0, 1.0], though backends may use
    /// a different range for various devices.
    pub position: f64,
}

impl ControllerAxisArgs {
    /// Create a new `ControllerAxisArgs` object. Intended for use by backends when
    /// emitting events.
    pub fn new(id: u32, axis: u8, position: f64) -> Self {
        ControllerAxisArgs { id, axis, position }
    }
}

/// The position of a controller axis changed.
pub trait ControllerAxisEvent: Sized {
    /// Creates a controller axis event.
    ///
    /// Preserves time stamp from original input event, if any.
    fn from_controller_axis_args(args: ControllerAxisArgs, old_event: &Self) -> Option<Self>;
    /// Calls closure if this is a controller axis event.
    fn controller_axis<U, F>(&self, f: F) -> Option<U>
    where
        F: FnMut(ControllerAxisArgs) -> U;
    /// Returns controller axis arguments.
    fn controller_axis_args(&self) -> Option<ControllerAxisArgs> {
        self.controller_axis(|args| args)
    }
}

impl ControllerAxisEvent for Event {
    fn from_controller_axis_args(args: ControllerAxisArgs, old_event: &Self) -> Option<Self> {
        let timestamp = if let Event::Input(_, x) = old_event {
            *x
        } else {
            None
        };
        Some(Event::Input(
            Input::Move(Motion::ControllerAxis(args)),
            timestamp,
        ))
    }

    fn controller_axis<U, F>(&self, mut f: F) -> Option<U>
    where
        F: FnMut(ControllerAxisArgs) -> U,
    {
        match *self {
            Event::Input(Input::Move(Motion::ControllerAxis(args)), _) => Some(f(args)),
            _ => None,
        }
    }
}

#[cfg(test)]
mod controller_axis_tests {
    use super::*;

    #[test]
    fn test_input_controller_axis() {
        let e: Event = ControllerAxisArgs::new(0, 1, 0.9).into();
        let a: Option<Event> =
            ControllerAxisEvent::from_controller_axis_args(ControllerAxisArgs::new(0, 1, 0.9), &e);
        let b: Option<Event> = a
            .clone()
            .unwrap()
            .controller_axis(|cnt| {
                ControllerAxisEvent::from_controller_axis_args(
                    ControllerAxisArgs::new(cnt.id, cnt.axis, cnt.position),
                    a.as_ref().unwrap(),
                )
            })
            .unwrap();
        assert_eq!(a, b);
    }
}