package engine.input;

import engine.math.Vector3f;

import java.nio.ByteBuffer;
import java.nio.FloatBuffer;

import static engine.input.InputConst.*;
import static org.lwjgl.glfw.GLFW.*;
/* Buttons
0 : Croix / A
1:  rond /B
2: carré / X
3: triangle / Y
4: L1 / LB
5: R1 / RB
6:select
7:start
8:L3
9:R3
10: haut
11: droite
12: bas
13: gauche
*/

/* Axes
0 : left X axe ( right : 1 left -1)
1: left Y axe ( down : 1 , Up -1)
2: right X axe ( right : 1 left -1)
3: right Y axe ( down : 1 , Up -1)
4:L2 / LT :  1 active, -1 unactive
5: R2 /RT :  1 active, -1 unactive
*/

public class GamepadInput {

     private final int gamepadNum;
     private ByteBuffer gamepadButton;
     private FloatBuffer gamepadAxes;
     
     public GamepadInput (int gamepadNum){
    	 this.gamepadNum            = gamepadNum;
    	 this.gamepadAxes           = null;
    	 this.gamepadButton         = null;
     }
																					
	 public void inputRefresh() {

        this.gamepadButton = glfwGetJoystickButtons(this.gamepadNum);
        this.gamepadAxes = glfwGetJoystickAxes(this.gamepadNum);

        assert gamepadAxes != null;
        assert gamepadButton != null;

	}

	public boolean checkPressed(int keyCode){
        this.gamepadButton = glfwGetJoystickButtons(this.gamepadNum);

        assert gamepadButton != null;

        return gamepadButton.get(keyCode) == 1;
    }

    /**
     * Envoie la position du stick pointé par axisId sous forme de direction général (9 directions)
     * @param axisId l'identifiant du joystick (AXE X)
     * @return la direction du stick valeur possible : RIGHT, UPPER_RIGHT, UP, UPPER_LEFT, LEFT, LOWER_LEFT, DOWN, LOWER_RIGHT, CENTER;
     */
    public int getAxisDiscreet(int axisId){

        float x = gamepadAxes.get(axisId);
        float y = gamepadAxes.get(axisId + 1);

        float magnitude = (float) Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
        float angle = (float) Math.toDegrees(2 * Math.atan(y /(x + magnitude)));

        if (magnitude < 0.3)                             return CENTER;
        if (angle < 22.5 && angle > -22.5)               return RIGHT;
        else if (angle > -67.5 && angle < -22.5)         return UPPER_RIGHT;
        else if (angle > -112.5 && angle < -67.5)        return UP_STICK;
        else if (angle > -157.5 && angle < -112.5)       return UPPER_LEFT;
        else if (angle < -157.5 || angle > 157.5)        return LEFT;
        else if (angle < 157.5 && angle > 112.5)         return LOWER_LEFT;
        else if (angle < 112.5 && angle > 67.5)          return DOWN_STICK;
        else if (angle < 67.5 && angle > 22.5)           return LOWER_RIGHT;

        return -1; // TEST
    }

    /**
     * Envoie la position du stick pointé par axisID (AXE X) sous forme de Vecteur
     * @param axisId l'identifiant du joystick (AXE X)
     * @return un Vecteur représentant la position actuel du joystick
     */
    public Vector3f getAxisContinuous(int axisId){

        float x = gamepadAxes.get(axisId);
        float y = gamepadAxes.get(axisId + 1);

        if (x < 0.1 && x > -0.1) x = 0;
        if (y < 0.1 && y > -0.1) y = 0;

        System.out.println("x: " + x + " y: " + y);

        return new Vector3f(x,y);
    }

    public String getGamepadName(){
        return glfwGetGamepadName(this.gamepadNum);
    }
	
}