#![no_std]
#![forbid(unsafe_code)]

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Key {
    Up,
    Down,
    Left,
    Right,
    Enter,
    Escape,
    Space,
    Backspace,
    Tab,
    Char(u8),
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum GamepadButton {
    South,
    East,
    North,
    West,
    DpadUp,
    DpadDown,
    DpadLeft,
    DpadRight,
    Start,
    Select,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Axis {
    LeftX,
    LeftY,
    RightX,
    RightY,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum InputEvent {
    KeyDown(Key),
    KeyUp(Key),
    PointerDown { id: u8, x: u16, y: u16 },
    PointerMove { id: u8, x: u16, y: u16 },
    PointerUp { id: u8, x: u16, y: u16 },
    Scroll { dx: i16, dy: i16 },
    GamepadButton { button: GamepadButton, pressed: bool },
    GamepadAxis { axis: Axis, value: i16 },
}

pub trait InputDevice {
    fn poll(&mut self) -> Option<InputEvent>;
    fn has_event(&self) -> bool;
    /// Clears the device's own interrupt condition after an IRQ, before
    /// the line is re-armed. Devices that clear it by being read need not.
    fn acknowledge(&mut self) {}
}