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//! Keyboard event types

use super::EventTrait;
use {AsRaw, FromRaw};
use ffi;

/// State of a Key
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum KeyState {
    /// Key is pressed
    Pressed,
    /// Key is released
    Released,
}

/// Common functions for all Keyboard-Events implement.
pub trait KeyboardEventTrait: AsRaw<ffi::libinput_event_keyboard> {
    ffi_func!(
    /// The event time for this event
    fn time, ffi::libinput_event_keyboard_get_time, u32);
    ffi_func!(
    /// The event time for this event in microseconds
    fn time_usec, ffi::libinput_event_keyboard_get_time_usec, u64);
    ffi_func!(
    /// The keycode that triggered this key event
    fn key, ffi::libinput_event_keyboard_get_key, u32);

    /// The state change of the key
    fn key_state(&self) -> KeyState {
        match unsafe { ffi::libinput_event_keyboard_get_key_state(self.as_raw() as *mut _) } {
            ffi::libinput_key_state::LIBINPUT_KEY_STATE_PRESSED => KeyState::Pressed,
            ffi::libinput_key_state::LIBINPUT_KEY_STATE_RELEASED => KeyState::Released,
        }
    }

    /// Convert into a general `KeyboardEvent` again
    fn into_keyboard_event(self) -> KeyboardEvent
        where Self: Sized
    {
        unsafe { KeyboardEvent::from_raw(self.as_raw_mut()) }
    }
}

impl<T: AsRaw<ffi::libinput_event_keyboard>> KeyboardEventTrait for T {}

/// A keyboard related `Event`
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum KeyboardEvent {
    /// An event related to pressing a key
    Key(KeyboardKeyEvent),
}

impl EventTrait for KeyboardEvent {
    #[doc(hidden)]
    fn as_raw_event(&self) -> *mut ffi::libinput_event {
        match *self {
            KeyboardEvent::Key(ref event) => event.as_raw_event(),
        }
    }
}

impl FromRaw<ffi::libinput_event_keyboard> for KeyboardEvent {
    unsafe fn from_raw(event: *mut ffi::libinput_event_keyboard) -> Self {
        let base = ffi::libinput_event_keyboard_get_base_event(event);
        match ffi::libinput_event_get_type(base) {
            ffi::libinput_event_type::LIBINPUT_EVENT_KEYBOARD_KEY => {
                KeyboardEvent::Key(KeyboardKeyEvent::from_raw(event))
            }
            _ => unreachable!(),
        }
    }
}

impl AsRaw<ffi::libinput_event_keyboard> for KeyboardEvent {
    fn as_raw(&self) -> *const ffi::libinput_event_keyboard {
        match *self {
            KeyboardEvent::Key(ref event) => event.as_raw(),
        }
    }
}

ffi_event_struct!(
/// An event related to pressing a key
struct KeyboardKeyEvent, ffi::libinput_event_keyboard, ffi::libinput_event_keyboard_get_base_event);

impl KeyboardKeyEvent {
    ffi_func!(
    /// For the key of a `KeyboardKeyEvent` event, return the total number of keys
    /// pressed on all devices on the associated seat after the event was triggered.
    pub fn seat_key_count, ffi::libinput_event_keyboard_get_seat_key_count, u32);
}