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      contributors may be used to endorse or promote products derived
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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 ChromaflashFilter implements ImageFilter{
    public static final int NUM_REQUIRED_IMAGE = 6;
    private int mWidth;
    private int mHeight;
    private int mStrideY;
    private int mStrideVU;
    private static String TAG = "ChromaflashFilter";

    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 ChromaflashFilter(CaptureModule module) {
        mModule = module;
    }

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

    @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");
        if(imageNum == 1 || imageNum == 2 || imageNum == 4) {
            mImageNum = imageNum;
            return;
        }
        int yActualSize = bY.remaining();
        int vuActualSize = bVU.remaining();
        mImageNum = imageNum;
        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(), roi);
        Log("processImage done");
        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 true;
    }

    @Override
    public void manualCapture(final CaptureRequest.Builder builder, final CameraCaptureSession captureSession,
                              final CameraCaptureSession.CaptureCallback callback, final Handler handler) throws CameraAccessException {
        new Thread() {
            public void run() {
                try {
                    for (int i = 0; i < NUM_REQUIRED_IMAGE; i++) {
                        if (i == 0) {
                            captureSession.capture(builder.build(), callback, handler);
                            waitForImage(i);
                        } else if (i == 1) { //To change the setting
                            builder.set(CaptureRequest.CONTROL_AE_LOCK, Boolean.FALSE);
                            builder.set(CaptureRequest.FLASH_MODE,
                                    CaptureRequest.FLASH_MODE_SINGLE);
                            captureSession.capture(builder.build(), callback, handler);
                            waitForImage(i);
                        } else if (i == 2) { //To change the setting
                            builder.set(CaptureRequest.CONTROL_AE_MODE,
                                    CaptureRequest.CONTROL_AE_MODE_ON);
                            CaptureRequest.Builder AeTunningBuilder = captureSession.getDevice().
                                    createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
                            CaptureRequest request = builder.build();
                            for (CaptureRequest.Key key : request.getKeys()) {
                                AeTunningBuilder.set(key, request.get(key));
                            }
                            AeTunningBuilder.addTarget(mModule.getPreviewSurfaceForSession(
                                    mModule.getMainCameraId()));

                            waitForAeBlock(AeTunningBuilder,builder,callback,
                                    captureSession,handler,5);
                        } else if (i == 3) {
                            captureSession.capture(builder.build(), callback, handler);
                            waitForImage(i);
                        } else if (i == 4) { //To change the setting
                            builder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_OFF);
                            builder.set(CaptureRequest.CONTROL_AE_LOCK, Boolean.FALSE);
                            captureSession.capture(builder.build(), callback, handler);
                            waitForImage(i);
                        } else if (i == 5) {
                            captureSession.capture(builder.build(), callback, handler);
                        }
                    }
                } catch(CameraAccessException e) {}

            }
        }.start();
    }

    private void waitForImage(int index) {
        try {
            while(mImageNum < index) {
                Thread.sleep(50);
            }
        } catch (InterruptedException e) {
        }
    }

    private void waitForAeBlock(final CaptureRequest.Builder tuningBuilder,
                                   final CaptureRequest.Builder captureBuilder,
                                   final CameraCaptureSession.CaptureCallback callback,
                                final CameraCaptureSession captureSession,
                                final Handler handler, final int AeTunningTime) {
        try{
            captureSession.capture(tuningBuilder.build(),
                    new CameraCaptureSession.CaptureCallback() {
                private boolean mAeStateConverged = false;

                @Override
                public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,
                                               TotalCaptureResult result) {
                    Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                    Log.d(TAG,"AE tunning onCaptureCompleted aeState = " + aeState);
                    if (aeState != null && aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
                        mAeStateConverged = true;
                    }
                    Log.d(TAG,"AE tunning completed mAeStateConverged = " + mAeStateConverged);
                    if(!mAeStateConverged && AeTunningTime >= 2) {
                        int resetTime = AeTunningTime - 1;
                        waitForAeBlock(tuningBuilder,captureBuilder,callback,
                                captureSession,handler,resetTime);
                    } else {
                        try{
                            captureSession.capture(captureBuilder.build(),callback,handler);
                        } catch (CameraAccessException e){}
                    }
                }
            }, handler);
        }catch (CameraAccessException e){

        }
    }

    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[] roi);

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