/*
 * Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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.
 */

#include "AVSCommon/Utils/Common/TestableAttachmentWriter.h"
#include "AVSCommon/Utils/Common/Common.h"

namespace alexaClientSDK {
namespace avsCommon {
namespace utils {

using namespace avsCommon::avs::attachment;
using namespace avsCommon::utils::sds;

TestableAttachmentWriter::TestableAttachmentWriter(
    std::shared_ptr<InProcessSDS> dummySDS,
    std::unique_ptr<AttachmentWriter> writer) :
        InProcessAttachmentWriter{dummySDS},
        m_writer{std::move(writer)},
        m_hasWriteBeenInvoked{false} {
}

std::size_t TestableAttachmentWriter::write(
    const void* buf,
    std::size_t numBytes,
    WriteStatus* writeStatus,
    std::chrono::milliseconds timeout) {
    bool simulatePause = false;

    if (!m_hasWriteBeenInvoked) {
        simulatePause = true;
        m_hasWriteBeenInvoked = true;
    } else {
        // Let's throw a random number, and simulate a pause if it's 1!
        simulatePause = (generateRandomNumber(0, 1) == 1);
    }

    if (simulatePause) {
        *writeStatus = WriteStatus::OK_BUFFER_FULL;
        return 0;
    }

    // Otherwise, let's have the encapsulated writer do the actual work.
    return m_writer->write(buf, numBytes, writeStatus);
}

void TestableAttachmentWriter::close() {
    m_writer->close();
}

}  // namespace utils
}  // namespace avsCommon
}  // namespace alexaClientSDK