InputTracker.h

#pragma once
#include <vector>
#include <GLFW/glfw3.h>
#include <iostream>

// this class uses GLFW to record input, and then stores it. This happens ever game-logic update via the perFrameUpdate function
// this class acts as an interface to monitor input data

class InputTracker {
public:

    const int numberStartIndex = 1;
    const int letterStartIndex = 1 + (NINE - ZERO + 1);
    const int arrowStartIndex = 1 + (NINE - ZERO + 1) + (Z - A + 1);

    enum Key {

        // Space key
        SPACE = GLFW_KEY_SPACE, //returns 32

        // All number keys
        ZERO = GLFW_KEY_0, //returns 48
        ONE = GLFW_KEY_1,
        TWO = GLFW_KEY_2,
        THREE = GLFW_KEY_3,
        FOUR = GLFW_KEY_4,
        FIVE = GLFW_KEY_5,
        SIX = GLFW_KEY_6,
        SEVEN = GLFW_KEY_7,
        EIGHT = GLFW_KEY_8,
        NINE = GLFW_KEY_9, //returns 57
        

        // All letter keys
        A = GLFW_KEY_A, //returns 65
        B = GLFW_KEY_B,
        C = GLFW_KEY_C,
        D = GLFW_KEY_D,
        E = GLFW_KEY_E,
        F = GLFW_KEY_F,
        G = GLFW_KEY_G,
        H = GLFW_KEY_H,
        I = GLFW_KEY_I,
        J = GLFW_KEY_J,
        K = GLFW_KEY_K,
        L = GLFW_KEY_L,
        M = GLFW_KEY_M,
        N = GLFW_KEY_N,
        O = GLFW_KEY_O,
        P = GLFW_KEY_P,
        Q = GLFW_KEY_Q,
        R = GLFW_KEY_R,
        S = GLFW_KEY_S,
        T = GLFW_KEY_T,
        U = GLFW_KEY_U,
        V = GLFW_KEY_V,
        W = GLFW_KEY_W,
        X = GLFW_KEY_X,
        Y = GLFW_KEY_Y,
        Z = GLFW_KEY_Z, //returns 90

        // Arrow keys
        ARROW_RIGHT = GLFW_KEY_RIGHT, //returns 262
        ARROW_LEFT = GLFW_KEY_LEFT,
        ARROW_DOWN = GLFW_KEY_DOWN,
        ARROW_UP = GLFW_KEY_UP, //returns 265

        // Total number of keys
        NUM_KEYS = 1 + (NINE - ZERO + 1 ) + (Z - A + 1) + (ARROW_UP - ARROW_RIGHT + 1)
    };

    enum Mouse {
        MouseLeft = GLFW_MOUSE_BUTTON_1,
        MouseMiddle = GLFW_MOUSE_BUTTON_2,
        MouseRight = GLFW_MOUSE_BUTTON_3,
        ScrollUp = GLFW_MOUSE_BUTTON_4,
        ScrollDown = GLFW_MOUSE_BUTTON_5,

        // Total number of buttons
        NUM_MOUSE_BUTTONS = (ScrollDown - MouseLeft + 1)
    };
    enum ButtonState {
        RELEASED,
        JUST_RELEASED,
        DOWN,
        JUST_DOWN
    };

    bool isKeyDown(Key aKey);
    bool isKeyJustDown(Key aKey);
    bool isKeyReleased(Key aKey);
    bool isKeyJustReleased(Key aKey);

    bool isMouseDown(Mouse aMouseButton);
    bool isMouseJustDown(Mouse aMouseButton);
    bool isMouseReleased(Mouse aMouseButton);
    bool isMouseJustReleased(Mouse aMouseButton);

    void perFrameUpdate(GLFWwindow* window);

    static InputTracker& getInstance();

private:

    ButtonState mKeyState[NUM_KEYS] = { };
    ButtonState mMouseState[NUM_MOUSE_BUTTONS] = { };
    InputTracker();

};