/*
 * Copyright 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.camera.extensions.internal;

import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.media.Image;
import android.util.Pair;
import android.util.Size;
import android.view.Surface;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.camera2.impl.Camera2CameraCaptureResultConverter;
import androidx.camera.core.ExperimentalGetImage;
import androidx.camera.core.ImageInfo;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.impl.CameraCaptureResult;
import androidx.camera.core.impl.CameraCaptureResults;
import androidx.camera.core.impl.CaptureProcessor;
import androidx.camera.core.impl.ImageProxyBundle;
import androidx.camera.extensions.impl.CaptureProcessorImpl;

import com.google.common.util.concurrent.ListenableFuture;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * A {@link CaptureProcessor} that calls a vendor provided implementation.
 */
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public final class AdaptingCaptureProcessor implements CaptureProcessor {
    private final CaptureProcessorImpl mImpl;

    public AdaptingCaptureProcessor(@NonNull CaptureProcessorImpl impl) {
        mImpl = impl;
    }

    @Override
    public void onOutputSurface(@NonNull Surface surface, int imageFormat) {
        mImpl.onOutputSurface(surface, imageFormat);
        mImpl.onImageFormatUpdate(imageFormat);
    }

    @Override
    @ExperimentalGetImage
    public void process(@NonNull ImageProxyBundle bundle) {
        List<Integer> ids = bundle.getCaptureIds();

        Map<Integer, Pair<Image, TotalCaptureResult>> bundleMap = new HashMap<>();

        for (Integer id : ids) {
            ListenableFuture<ImageProxy> imageProxyListenableFuture = bundle.getImageProxy(id);
            try {
                ImageProxy imageProxy = imageProxyListenableFuture.get(5, TimeUnit.SECONDS);
                Image image = imageProxy.getImage();
                if (image == null) {
                    return;
                }

                ImageInfo imageInfo = imageProxy.getImageInfo();

                CameraCaptureResult result =
                        CameraCaptureResults.retrieveCameraCaptureResult(imageInfo);
                if (result == null) {
                    return;
                }

                CaptureResult captureResult =
                        Camera2CameraCaptureResultConverter.getCaptureResult(result);
                if (captureResult == null) {
                    return;
                }

                TotalCaptureResult totalCaptureResult = (TotalCaptureResult) captureResult;
                if (totalCaptureResult == null) {
                    return;
                }

                Pair<Image, TotalCaptureResult> imageCapturePair = new Pair<>(imageProxy.getImage(),
                        totalCaptureResult);
                bundleMap.put(id, imageCapturePair);
            } catch (TimeoutException | ExecutionException | InterruptedException e) {
                return;
            }
        }

        mImpl.process(bundleMap);
    }

    @Override
    public void onResolutionUpdate(@NonNull Size size) {
        mImpl.onResolutionUpdate(size);
    }
}