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///
/// Input from the window to the rendering (and whatever else needs it) each frame.
///
#[derive(Clone, Debug)]
pub struct FrameInput {
    /// A list of [events](crate::Event) which has occurred since last frame.
    pub events: Vec<Event>,

    /// Milliseconds since last frame.
    pub elapsed_time: f64,

    /// Milliseconds accumulated time since start.
    pub accumulated_time: f64,

    /// Viewport of the window in physical pixels (the size of the [screen](crate::Screen)).
    pub viewport: crate::Viewport,

    /// Width of the window in logical pixels.
    pub window_width: usize,

    /// Height of the window in logical pixels.
    pub window_height: usize,

    /// Number of physical pixels for each logical pixel.
    pub device_pixel_ratio: usize,

    /// Whether or not this is the first frame.
    pub first_frame: bool
}

/// State of a key or button click.
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash)]
pub enum State
{
    Pressed,
    Released
}

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

/// Type of mouse button.
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash)]
pub enum MouseButton {
    Left,
    Right,
    Middle,
}

/// An input event (from mouse, keyboard or similar).
#[derive(Clone, Debug)]
pub enum Event
{
    MouseClick {
        state: State,
        button: MouseButton,
        position: (f64, f64),
        modifiers: Modifiers,
        handled: bool
    },
    MouseMotion {
        delta: (f64, f64),
        position: (f64, f64),
        modifiers: Modifiers,
        handled: bool
    },
    MouseWheel {
        delta: (f64, f64),
        position: (f64, f64),
        modifiers: Modifiers,
        handled: bool
    },
    MouseEnter,
    MouseLeave,
    Key {
        state: State,
        kind: Key,
        modifiers: Modifiers,
        handled: bool
    },
    ModifiersChange {
        modifiers: Modifiers
    },
    Text(String)
}

/// Keyboard key input.
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash)]
pub enum Key {
    ArrowDown,
    ArrowLeft,
    ArrowRight,
    ArrowUp,

    Escape,
    Tab,
    Backspace,
    Enter,
    Space,

    Insert,
    Delete,
    Home,
    End,
    PageUp,
    PageDown,

    /// Either from the main row or from the numpad.
    Num0,
    /// Either from the main row or from the numpad.
    Num1,
    /// Either from the main row or from the numpad.
    Num2,
    /// Either from the main row or from the numpad.
    Num3,
    /// Either from the main row or from the numpad.
    Num4,
    /// Either from the main row or from the numpad.
    Num5,
    /// Either from the main row or from the numpad.
    Num6,
    /// Either from the main row or from the numpad.
    Num7,
    /// Either from the main row or from the numpad.
    Num8,
    /// Either from the main row or from the numpad.
    Num9,

    A,
    B,
    C,
    D,
    E,
    F,
    G,
    H,
    I,
    J,
    K,
    L,
    M,
    N,
    O,
    P,
    Q,
    R,
    S,
    T,
    U,
    V,
    W,
    X,
    Y,
    Z,
}

/// State of modifiers (alt, ctrl, shift and command).
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub struct Modifiers {
    /// Either of the alt keys are down (option ⌥ on Mac).
    pub alt: State,
    /// Either of the control keys are down.
    /// When checking for keyboard shortcuts, consider using [`Self::command`] instead.
    pub ctrl: State,
    /// Either of the shift keys are down.
    pub shift: State,
    /// On Windows and Linux, set this to the same value as `ctrl`.
    /// On Mac, this should be set whenever one of the ⌘ Command keys are down.
    pub command: State,
}