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//! Tools for working with button-like user inputs (mouse clicks, gamepad button, keyboard inputs and so on)
//!
use serde::{Deserialize, Serialize};

/// The current state of a particular button,
/// usually corresponding to a single [`Actionlike`] action.
///
/// By default, buttons are [`ButtonState::Released`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum ButtonState {
    /// The button was pressed since the most recent tick
    JustPressed,
    /// This button is currently pressed (and was pressed before the most recent tick)
    Pressed,
    /// The button was released since the most recent tick
    JustReleased,
    /// This button is currently released (and was released before the most recent tick)
    Released,
}

impl ButtonState {
    /// Causes [`just_pressed`](ButtonState::just_pressed) and [`just_released`](ButtonState::just_released) to become false
    ///
    /// [`JustPressed`](ButtonState::JustPressed) becomes [`Pressed`](ButtonState::Pressed) and
    /// [`JustReleased`](ButtonState::JustReleased) becomes [`Released`](ButtonState::Released)
    pub fn tick(&mut self) {
        use ButtonState::*;
        *self = match self {
            JustPressed => Pressed,
            Pressed => Pressed,
            JustReleased => Released,
            Released => Released,
        }
    }

    /// Presses the button
    ///
    /// It will be [`JustPressed`](ButtonState::JustPressed), unless it was already [`Pressed`](ButtonState::Pressed)
    #[inline]
    pub fn press(&mut self) {
        if *self != ButtonState::Pressed {
            *self = ButtonState::JustPressed;
        }
    }

    /// Releases the button
    ///
    /// It will be [`JustReleased`](ButtonState::JustReleased), unless it was already [`Released`](ButtonState::Released)
    #[inline]
    pub fn release(&mut self) {
        if *self != ButtonState::Released {
            *self = ButtonState::JustReleased;
        }
    }

    /// Is the button currently pressed?
    #[inline]
    #[must_use]
    pub fn pressed(&self) -> bool {
        *self == ButtonState::Pressed || *self == ButtonState::JustPressed
    }

    /// Is the button currently released?
    #[inline]
    #[must_use]
    pub fn released(&self) -> bool {
        *self == ButtonState::Released || *self == ButtonState::JustReleased
    }

    /// Was the button pressed since the last time [`ActionState::update`] was called?
    #[inline]
    #[must_use]
    pub fn just_pressed(&self) -> bool {
        *self == ButtonState::JustPressed
    }

    /// Was the button released since the last time [`ActionState::update`] was called?
    #[inline]
    #[must_use]
    pub fn just_released(&self) -> bool {
        *self == ButtonState::JustReleased
    }
}

impl Default for ButtonState {
    fn default() -> Self {
        ButtonState::Released
    }
}

/// A buttonlike-input triggered by [`MouseWheel`](bevy::input::mouse::MouseWheel) events
///
/// These will be considered pressed if non-zero net movement in the correct direction is detected.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum MouseWheelDirection {
    /// Corresponds to `+y`
    Up,
    /// Corresponds to `-y`
    Down,
    /// Corresponds to `+x`
    Right,
    /// Corresponds to `-x`
    Left,
}

/// A buttonlike-input triggered by [`MouseMotion`](bevy::input::mouse::MouseMotion) events
///
/// These will be considered pressed if non-zero net movement in the correct direction is detected.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum MouseMotionDirection {
    /// Corresponds to `+y`
    Up,
    /// Corresponds to `-y`
    Down,
    /// Corresponds to `+x`
    Right,
    /// Corresponds to `-x`
    Left,
}