// Copyright 2017-2018 Matthew D. Michelotti
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Structs related to user input.

#[cfg(target_arch = "wasm32")] use std::mem;

/// Enum for keyboard keys and mouse buttons.
#[repr(u8)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum KeyCode {
    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,
    Num0, Num1, Num2, Num3, Num4, Num5, Num6, Num7, Num8, Num9,
    Right, Left, Down, Up,
    Return,
    Space,
    Backspace, Delete,
    MouseLeft, MouseRight, MouseMiddle,
}

#[cfg(target_arch = "wasm32")]
impl KeyCode {
    fn count() -> u8 { KeyCode::MouseMiddle as u8 + 1 }
    pub(crate) fn from_u8(id: u8) -> Option<KeyCode> {
        if id < Self::count() { Some(unsafe { mem::transmute(id) }) } else { None }
    }
}