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      notice, this list of conditions and the following disclaimer.
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      copyright notice, this list of conditions and the following
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      with the distribution.
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      contributors may be used to endorse or promote products derived
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ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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 */

package com.android.camera.imageprocessor.filter;

import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.params.Face;
import android.os.Handler;
import android.util.Log;
import android.util.Size;

import com.android.camera.CaptureModule;
import com.android.camera.ui.FilmstripBottomControls;
import com.android.camera.ui.TrackingFocusRenderer;

import java.nio.ByteBuffer;
import java.util.HashSet;
import java.util.List;

public class TrackingFocusFrameListener implements ImageFilter {

    int mWidth;
    int mHeight;
    int mStrideY;
    int mStrideVU;
    private CaptureModule mModule;
    private static boolean DEBUG = false;
    private static String TAG = "TrackingFocusFrameListener";
    private static boolean mIsSupported = false;
    private Rect imageRect;
    public static final int PENDING_REGISTRATION = -1;
    public static final int MAX_NUM_TRACKED_OBJECTS = 3;
    private int mTrackedId = PENDING_REGISTRATION;
    private boolean mIsInitialzed = false;
    private TrackingFocusRenderer mTrackingFocusRender;
    byte[] yvuBytes = null;
    private int[] mInputCords = null;
    private boolean mIsFirstTime = true;

    public enum OperationMode {
        DEFAULT,
        PERFORMANCE,
        CPU_OFFLOAD,
        LOW_POWER
    }

    public enum Precision {
        HIGH,
        LOW
    }

    public TrackingFocusFrameListener(CaptureModule module) {
        mModule = module;
    }

    @Override
    public List<CaptureRequest> setRequiredImages(CaptureRequest.Builder builder) {
        return null;
    }

    @Override
    public String getStringName() {
        return "TrackingFocusFrameListener";
    }

    @Override
    public int getNumRequiredImage() {
        return 1;
    }

    @Override
    public void init(int width, int height, int strideY, int strideVU) {
        mWidth = width;
        mHeight = height;
        mStrideY = strideY;
        mStrideVU = strideVU;
        if(!mIsInitialzed) {
            if (nInit(OperationMode.PERFORMANCE.ordinal(), Precision.HIGH.ordinal(), mWidth, mHeight, mStrideY) < 0) {
                Log.e(TAG, "Initialization failed.");
            }
            imageRect = new Rect(0, 0, width, height);
            mTrackingFocusRender = mModule.getTrackingForcusRenderer();
            yvuBytes = new byte[mStrideY*mHeight*3/2];
            mIsInitialzed = true;
        }
    }

    @Override
    public void deinit() {
        if (mIsInitialzed) {
            nRelease();
            mIsInitialzed = false;
        }
    }

    @Override
    public void addImage(ByteBuffer bY, ByteBuffer bVU, int imageNum, Object isPreview) {
        bY.get(yvuBytes, 0, bY.remaining());
        bVU.get(yvuBytes, mStrideY * mHeight, bVU.remaining());
        int[] cords = mTrackingFocusRender.getInputCords(mWidth, mHeight);
        if(cords != null) {
            if(mTrackedId != PENDING_REGISTRATION) {
                unregisterObject(mTrackedId);
                mTrackedId = PENDING_REGISTRATION;
            }
            mIsFirstTime = true;
            mInputCords = cords;
        }
        if(mInputCords != null) {
            if (mTrackedId == PENDING_REGISTRATION) {
                try {
                    mTrackedId = registerObject(yvuBytes, new Point(mInputCords[0], mInputCords[1]), mIsFirstTime);
                    mIsFirstTime = false;
                }catch(IllegalArgumentException e) {
                    mTrackedId = PENDING_REGISTRATION;
                    Log.e(TAG, e.toString());
                }
            }
            if(mTrackedId != PENDING_REGISTRATION) {
                mTrackingFocusRender.putRegisteredCords(trackObjects(yvuBytes), mWidth, mHeight);
            }
        }
    }

    public static class Result {
        public final int id;
        public final int confidence;
        public Rect pos;

        private Result(int id, int confidence, int left, int top, int right, int bottom) {
            this.id = id;
            this.confidence = confidence;
            this.pos = new Rect(left, top, right, bottom);
        }

        public static Result Copy(Result old) {
            Result result = new Result(old.id, old.confidence, old.pos.left, old.pos.top, old.pos.right, old.pos.bottom);
            return result;
        }
    }

    public int getMinRoiDimension() {
        if (!mIsInitialzed) {
            throw new IllegalArgumentException("already released");
        }

        return nGetMinRoiDimension();
    }

    public int getMaxRoiDimension() {
        if (!mIsInitialzed) {
            throw new IllegalArgumentException("already released");
        }

        return nGetMaxRoiDimension();
    }

    public int registerObject(byte[] imageDataNV21, Rect rect)
    {
        if (imageDataNV21 == null || imageDataNV21.length < getMinFrameSize()) {
            throw new IllegalArgumentException("imageDataNV21 null or too small to encode frame");
        } else if (rect == null || rect.isEmpty() || !imageRect.contains(rect)) {
            throw new IllegalArgumentException("rect must be non-empty and be entirely inside " +
                    "the frame");
        } else if (!mIsInitialzed) {
            throw new IllegalArgumentException("already released");
        }
        int id = nRegisterObjectByRect(imageDataNV21, rect.left, rect.top, rect.right, rect.bottom);
        if(id == 0) {
            id = PENDING_REGISTRATION;
        }
        mTrackedId = id;
        return mTrackedId;
    }

    public int registerObject(byte[] imageDataNV21, Point point, boolean firstTime)
    {
        if (imageDataNV21 == null || imageDataNV21.length < getMinFrameSize()) {
            throw new IllegalArgumentException("imageDataNV21 null or too small to encode frame"
                    + imageDataNV21.length+ " "+getMinFrameSize());
        } else if (point == null || !imageRect.contains(point.x, point.y)) {
            throw new IllegalArgumentException("point is outside the image frame: "+imageRect.toString());
        } else if (!mIsInitialzed) {
            throw new IllegalArgumentException("already released");
        }
        int id = nRegisterObjectByPoint(imageDataNV21, point.x, point.y, firstTime);
        if(id == 0) {
            id = PENDING_REGISTRATION;
        }
        mTrackedId = id;
        return mTrackedId;
    }

    public void unregisterObject(int id)
    {
        if (id == PENDING_REGISTRATION) {
            Log.e(TAG, "There's a pending object");
        } else if (!mIsInitialzed) {
            Log.e(TAG, "already released");
        }
        nUnregisterObject(id);
    }

    public Result trackObjects(byte[] imageDataNV21)
    {
        if (imageDataNV21 == null || imageDataNV21.length < getMinFrameSize()) {
            Log.e(TAG, "imageDataNV21 null or too small to encode frame "
                    + imageDataNV21.length+ " "+getMinFrameSize());
        } else if (!mIsInitialzed) {
            Log.e(TAG, "It's released");
        }

        int[] nResults = nTrackObjects(imageDataNV21);
        return new Result(nResults[0], nResults[1], nResults[2], nResults[3], nResults[4], nResults[5]);
    }

    private int getMinFrameSize() {
        return ((mStrideY * imageRect.bottom * 3) / 2);
    }

    @Override
    public ResultImage processImage() {
        return null;
    }

    @Override
    public boolean isSupported() {
        return mIsSupported;
    }

    public static boolean isSupportedStatic() {
        return mIsSupported;
    }

    @Override
    public boolean isFrameListener() {
        return true;
    }

    @Override
    public boolean isManualMode() {
        return false;
    }

    @Override
    public void manualCapture(CaptureRequest.Builder builder, CameraCaptureSession captureSession,
                              CameraCaptureSession.CaptureCallback callback, Handler handler) {

    }

    private native int nInit(int operationMode, int precision, int width, int height, int stride);
    private native void nRelease();
    private native int nGetMinRoiDimension();
    private native int nGetMaxRoiDimension();
    private native int nRegisterObjectByRect(byte[] imageDataNV21, int left, int top, int right, int bottom);
    private native int nRegisterObjectByPoint(byte[] imageDataNV21, int x, int y, boolean firstTime);
    private native void nUnregisterObject(int id);
    private native int[] nTrackObjects(byte[] imageDataNV21);

    static {
        mIsSupported = false;
    }
}