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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
      from this software without specific prior written permission.

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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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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 */
package com.android.camera.imageprocessor.filter;

import android.graphics.Rect;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.os.Handler;
import android.util.Log;

import com.android.camera.CaptureModule;

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

public class DeepZoomFilter implements ImageFilter{
    public static final int NUM_REQUIRED_IMAGE = 1;
    private int mWidth;
    private int mHeight;
    private int mStrideY;
    private int mStrideVU;
    private static String TAG = "DeepZoomFilter";

    private static boolean mIsSupported = false;
    private ByteBuffer mOutBuf;
    private CaptureModule mModule;
    private int mImageNum = -1;

    private static void Log(String msg) {
        if(DEBUG) {
            Log.d(TAG, msg);
        }
    }

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

    @Override
    public List<CaptureRequest> setRequiredImages(CaptureRequest.Builder builder) {
        List<CaptureRequest> list = new ArrayList<CaptureRequest>();
        for(int i=0; i < NUM_REQUIRED_IMAGE; i++) {
            list.add(builder.build());
        }
        return list;
    }

    @Override
    public String getStringName() {
        return TAG;
    }

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

    @Override
    public void init(int width, int height, int strideY, int strideVU) {
        Log("init");
        mWidth = width/2*2;
        mHeight = height/2*2;
        mStrideY = strideY/2*2;
        mStrideVU = strideVU/2*2;
        mOutBuf = ByteBuffer.allocate(mStrideY*mHeight*3/2);
        mImageNum = -1;
        Log("width: "+mWidth+" height: "+mHeight+" strideY: "+mStrideY+" strideVU: "+mStrideVU);
        nativeInit(mWidth, mHeight, mStrideY, mStrideVU,
                0, 0, mWidth, mHeight, NUM_REQUIRED_IMAGE);
    }

    @Override
    public void deinit() {
        Log("deinit");
        mOutBuf = null;
        mImageNum = -1;
        nativeDeinit();
    }

    @Override
    public void addImage(ByteBuffer bY, ByteBuffer bVU, int imageNum, Object param) {
        Log("addImage imageNum :" + imageNum);
        int yActualSize = bY.remaining();
        int vuActualSize = bVU.remaining();
        mImageNum = imageNum;
        int status = nativeAddImage(bY, bVU, yActualSize, vuActualSize, imageNum);
        Log("addImage status :" + status);
        if(status != 0) {
            Log.e(TAG, "Fail to add image");
        }
    }

    @Override
    public ResultImage processImage() {
        float zoomValue = mModule.getZoomValue();
        Log("processImage zoomValue :" + zoomValue);
        int[] roi = new int[4];
        int status = nativeProcessImage(mOutBuf.array(), zoomValue, roi);
        Log("processImage done status :" + status);
        mImageNum = -1;
        if(status < 0) { //In failure case, library will return the first image as it is.
            Log.w(TAG, "Fail to process the image.");
        }
        return new ResultImage(mOutBuf, new Rect(roi[0], roi[1], roi[0]+roi[2], roi[1] + roi[3]), mWidth, mHeight, mStrideY);
    }

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

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

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

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

    public static boolean isSupportedStatic() {
        return mIsSupported;
    }

    private native int nativeInit(int width, int height, int yStride, int vuStride,
                                  int roiX, int roiY, int roiW, int roiH, int numImages);
    private native int nativeDeinit();
    private native int nativeAddImage(ByteBuffer yB, ByteBuffer vuB, int ySize, int vuSize, int imageNum);
    private native int nativeProcessImage(byte[] buffer, float zoomValue, int[] roi);

    static {
        try {
            if (mIsSupported) {
                System.loadLibrary("jni_deepzoom");
            }
            mIsSupported = false;
        }catch(UnsatisfiedLinkError e) {
            Log.d(TAG, e.toString());
            mIsSupported = false;
        }
    }
}