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package com.jme3.input.vr.osvr;

import java.util.logging.Logger;

import com.jme3.app.VREnvironment;
import com.jme3.input.vr.VRInputAPI;
import com.jme3.input.vr.VRInputType;
import com.jme3.input.vr.VRTrackedController;
import com.jme3.math.Quaternion;
import com.jme3.math.Vector2f;
import com.jme3.math.Vector3f;
import com.jme3.renderer.Camera;
import com.jme3.scene.Spatial;
import com.jme3.system.osvr.osvrclientkit.OsvrClientKitLibrary;
import com.jme3.system.osvr.osvrclientkit.OsvrClientKitLibrary.OSVR_ClientInterface;
import com.jme3.system.osvr.osvrclientreporttypes.OSVR_AnalogReport;
import com.jme3.system.osvr.osvrclientreporttypes.OSVR_ButtonReport;
import com.jme3.system.osvr.osvrclientreporttypes.OSVR_Pose3;
import com.jme3.system.osvr.osvrinterface.OsvrInterfaceLibrary;
import com.jme3.system.osvr.osvrtimevalue.OSVR_TimeValue;
import com.sun.jna.Callback;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.PointerByReference;


/**
 * A class that wraps an OSVR input.
 * @author reden - phr00t - https://github.com/phr00t
 * @author Julien Seinturier - COMEX SA - http://www.seinturier.fr
 */
public class OSVRInput implements VRInputAPI {
    private static final Logger logger = Logger.getLogger(OSVRInput.class.getName());

    // position example: https://github.com/OSVR/OSVR-Core/blob/master/examples/clients/TrackerState.c
    // button example: https://github.com/OSVR/OSVR-Core/blob/master/examples/clients/ButtonCallback.c
    // analog example: https://github.com/OSVR/OSVR-Core/blob/master/examples/clients/AnalogCallback.c

    private static final int ANALOG_COUNT = 3, BUTTON_COUNT = 7, CHANNEL_COUNT = 3;

    OSVR_ClientInterface[][] buttons;
    OSVR_ClientInterface[][][] analogs;
    OSVR_ClientInterface[] hands;

    OSVR_Pose3[] handState;
    Callback buttonHandler, analogHandler;
    OSVR_TimeValue tv = new OSVR_TimeValue();
    boolean[] isHandTracked = new boolean[2];

    private float[][][] analogState;
    private float[][] buttonState;

    private final Quaternion tempq = new Quaternion();
    private final Vector3f tempv = new Vector3f();
    private final Vector2f temp2 = new Vector2f();
    private final boolean[][] buttonDown = new boolean[16][16];

    private static final Vector2f temp2Axis = new Vector2f();
    private static final Vector2f lastCallAxis[] = new Vector2f[16];
    private static float axisMultiplier = 1f;

    private VREnvironment environment = null;

    /**
     * Get the system String that identifies a controller.
     * @param left is the controller is the left one (false if the right controller is needed).
     * @param index the index of the controller.
     * @return the system String that identifies the controller.
     */
    public static byte[] getButtonString(boolean left, byte index) {
        if( left ) {
            return new byte[] { '/', 'c', 'o', 'n', 't', 'r', 'o', 'l', 'l', 'e', 'r', '/', 'l', 'e', 'f', 't', '/', index, (byte)0 };
        }
        return new byte[] { '/', 'c', 'o', 'n', 't', 'r', 'o', 'l', 'l', 'e', 'r', '/', 'r', 'i', 'g', 'h', 't', '/', index, (byte)0 };
    }

    /**
     * The left-hand system String.
     */
    public static byte[] leftHand = { '/', 'm', 'e', '/', 'h', 'a', 'n', 'd', 's', '/', 'l', 'e', 'f', 't', (byte)0 };

    /**
     * The right-hand system String.
     */
    public static byte[] rightHand = { '/', 'm', 'e', '/', 'h', 'a', 'n', 'd', 's', '/', 'r', 'i', 'g', 'h', 't', (byte)0 };


    /**
     * Create a new OSVR input attached to the given {@link VREnvironment VR environment}.
     * @param environment the {@link VREnvironment VR environment} to which the input is attached.
     */
    public OSVRInput(VREnvironment environment){
      this.environment = environment;
    }

    @Override
    public boolean isButtonDown(int controllerIndex, VRInputType checkButton) {
        return buttonState[controllerIndex][checkButton.getValue()] != 0f;
    }

    @Override
    public boolean wasButtonPressedSinceLastCall(int controllerIndex, VRInputType checkButton) {
        boolean buttonDownNow = isButtonDown(controllerIndex, checkButton);
        int checkButtonValue = checkButton.getValue();
        boolean retval = buttonDownNow == true && buttonDown[controllerIndex][checkButtonValue] == false;
        buttonDown[controllerIndex][checkButtonValue] = buttonDownNow;
        return retval;
    }

    @Override
    public void resetInputSinceLastCall() {
        for(int i=0;i