/*
 * Copyright (C) 2017 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.
 */

#define LOG_TAG "AAudioServiceEndpointCapture"
//#define LOG_NDEBUG 0
#include <utils/Log.h>

#include <assert.h>
#include <map>
#include <mutex>
#include <utils/Singleton.h>

#include "AAudioEndpointManager.h"
#include "AAudioServiceEndpoint.h"

#include "core/AudioStreamBuilder.h"
#include "AAudioServiceEndpoint.h"
#include "AAudioServiceStreamShared.h"
#include "AAudioServiceEndpointCapture.h"
#include "AAudioServiceEndpointShared.h"

using namespace android;  // TODO just import names needed
using namespace aaudio;   // TODO just import names needed

AAudioServiceEndpointCapture::AAudioServiceEndpointCapture(AAudioService& audioService)
        : AAudioServiceEndpointShared(
                new AudioStreamInternalCapture(audioService.asAAudioServiceInterface(), true)) {
}

aaudio_result_t AAudioServiceEndpointCapture::open(const aaudio::AAudioStreamRequest &request) {
    aaudio_result_t result = AAudioServiceEndpointShared::open(request);
    if (result == AAUDIO_OK) {
        int distributionBufferSizeBytes = getStreamInternal()->getFramesPerBurst()
                                          * getStreamInternal()->getBytesPerFrame();
        mDistributionBuffer = std::make_unique<uint8_t[]>(distributionBufferSizeBytes);
    }
    return result;
}

// Read data from the shared MMAP stream and then distribute it to the client streams.
void *AAudioServiceEndpointCapture::callbackLoop() {
    ALOGD("callbackLoop() entering");
    aaudio_result_t result = AAUDIO_OK;
    int64_t timeoutNanos = getStreamInternal()->calculateReasonableTimeout();

    // result might be a frame count
    while (mCallbackEnabled.load() && getStreamInternal()->isActive() && (result >= 0)) {

        int64_t mmapFramesRead = getStreamInternal()->getFramesRead();

        // Read audio data from stream using a blocking read.
        result = getStreamInternal()->read(mDistributionBuffer.get(),
                getFramesPerBurst(), timeoutNanos);
        if (result == AAUDIO_ERROR_DISCONNECTED) {
            ALOGD("%s() read() returned AAUDIO_ERROR_DISCONNECTED", __func__);
            // We do not need the returned vector.
            (void) AAudioServiceEndpointShared::disconnectRegisteredStreams();
            break;
        } else if (result != getFramesPerBurst()) {
            ALOGW("callbackLoop() read %d / %d",
                  result, getFramesPerBurst());
            break;
        }

        // Distribute data to each active stream.
        { // brackets are for lock_guard
            std::lock_guard <std::mutex> lock(mLockStreams);
            for (const auto& clientStream : mRegisteredStreams) {
                if (clientStream->isRunning() && !clientStream->isSuspended()) {
                    sp<AAudioServiceStreamShared> streamShared =
                            static_cast<AAudioServiceStreamShared *>(clientStream.get());
                    streamShared->writeDataIfRoom(mmapFramesRead,
                                                  mDistributionBuffer.get(),
                                                  getFramesPerBurst());
                }
            }
        }
    }

    ALOGD("callbackLoop() exiting");
    return NULL; // TODO review
}