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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
      from this software without specific prior written permission.

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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.os.Handler;
import android.util.Log;
import android.util.Range;
import android.util.Rational;

import com.android.camera.CaptureModule;

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

public class SharpshooterFilter implements ImageFilter{
    public static final int NUM_REQUIRED_IMAGE = 5;
    private int mWidth;
    private int mHeight;
    private int mStrideY;
    private int mStrideVU;
    private static String TAG = "SharpshooterFilter";
    private static final boolean DEBUG = false;
    private int temp;
    private static boolean mIsSupported = true;
    private ByteBuffer mOutBuf;
    private CaptureModule mModule;
    private int mSenseValue = 0;
    private long mExpoTime;

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

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

    private void getSenseUpperValue() {
        if(mSenseValue == 0) {
            Range<Integer> sensRange = mModule.getMainCameraCharacteristics().get(CameraCharacteristics.SENSOR_INFO_SENSITIVITY_RANGE);
            mSenseValue = sensRange.getUpper();
        }
    }
    @Override
    public List<CaptureRequest> setRequiredImages(CaptureRequest.Builder builder) {
        getSenseUpperValue();
        mExpoTime = (mModule.getPreviewCaptureResult().get(CaptureResult.SENSOR_EXPOSURE_TIME)/2);
        int isoValue = (mModule.getPreviewCaptureResult().get(CaptureResult.SENSOR_SENSITIVITY)).intValue()*2;
        if(isoValue < mSenseValue) {
            mSenseValue = isoValue;
        }

        List<CaptureRequest> list = new ArrayList<CaptureRequest>();
        for(int i=0; i < NUM_REQUIRED_IMAGE; i++) {
            builder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);
            builder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, new Long(mExpoTime));
            builder.set(CaptureRequest.SENSOR_SENSITIVITY, mSenseValue);
            list.add(builder.build());
        }
        return list;
    }

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

    @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);
        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;
        nativeDeinit();
    }

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

    @Override
    public ResultImage processImage() {
        Log("processImage ");
        int[] roi = new int[4];
        int status = nativeProcessImage(mOutBuf.array(), (int) (mExpoTime / 1000000), mSenseValue, roi);
        Log("processImage done");
        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(CaptureRequest.Builder builder, CameraCaptureSession captureSession,
                              CameraCaptureSession.CaptureCallback callback, Handler handler) {

    }

    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, int expoTime, int isoValue, int[] roi);

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