/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *    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.
 *    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.
 */

#include <app/clusters/ota-requestor/OTADownloader.h>
#include <app/clusters/ota-requestor/OTARequestorInterface.h>

#include "OTAImageProcessorImpl.h"

namespace chip {

bool OTAImageProcessorImpl::IsFirstImageRun()
{
    OTARequestorInterface * requestor = chip::GetRequestorInstance();
    if (requestor == nullptr)
    {
        return false;
    }

    return requestor->GetCurrentUpdateState() == OTARequestorInterface::OTAUpdateStateEnum::kApplying;
}

CHIP_ERROR OTAImageProcessorImpl::ConfirmCurrentImage()
{
    OTARequestorInterface * requestor = chip::GetRequestorInstance();
    if (requestor == nullptr)
    {
        return CHIP_ERROR_INTERNAL;
    }

    uint32_t currentSwVersion;
    uint32_t targetVersion = requestor->GetTargetVersion();
    ReturnErrorOnFailure(DeviceLayer::ConfigurationMgr().GetSoftwareVersion(currentSwVersion));

    if (currentSwVersion != targetVersion)
    {
        ChipLogError(SoftwareUpdate, "Current software version = %" PRIu32 ", expected software version = %" PRIu32,
                     currentSwVersion, targetVersion);
        return CHIP_ERROR_INCORRECT_STATE;
    }

    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::PrepareDownload()
{

    // Get OTA status - under what circumstances does prepared break?
    // what happens if a prepare is pending and another one is invoked
    // Should we store the state here and wait until we receive notification

    mHeaderParser.Init();

    DeviceLayer::PlatformMgr().ScheduleWork(HandlePrepareDownload, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::ProcessHeader(ByteSpan & block)
{
    if (mHeaderParser.IsInitialized())
    {
        OTAImageHeader header;
        CHIP_ERROR error = mHeaderParser.AccumulateAndDecode(block, header);

        // Needs more data to decode the header
        ReturnErrorCodeIf(error == CHIP_ERROR_BUFFER_TOO_SMALL, CHIP_NO_ERROR);
        ReturnErrorOnFailure(error);

        mParams.totalFileBytes = header.mPayloadSize;
        mHeaderParser.Clear();

        // Load qvCHIP_Ota header structure and call application callback to validate image header
        qvCHIP_Ota_ImageHeader_t qvCHIP_OtaImgHeader;
        this->mSwVer                             = header.mSoftwareVersion; // Store software version in imageProcessor as well
        qvCHIP_OtaImgHeader.vendorId             = header.mVendorId;
        qvCHIP_OtaImgHeader.productId            = header.mProductId;
        qvCHIP_OtaImgHeader.softwareVersion      = header.mSoftwareVersion;
        qvCHIP_OtaImgHeader.minApplicableVersion = header.mMinApplicableVersion.ValueOr(0);
        qvCHIP_OtaImgHeader.maxApplicableVersion = header.mMaxApplicableVersion.ValueOr(0);

        if (true != qvCHIP_OtaValidateImage(qvCHIP_OtaImgHeader))
        {
            // Dropping image due to invalid header
            return CHIP_DEVICE_ERROR_SOFTWARE_UPDATE_IGNORED;
        }
    }

    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::Finalize()
{
    DeviceLayer::PlatformMgr().ScheduleWork(HandleFinalize, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::Apply()
{
    ChipLogProgress(SoftwareUpdate, "Q: Applying - resetting device");

    // Reset into Bootloader
    qvCHIP_OtaReset();

    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::Abort()
{
    DeviceLayer::PlatformMgr().ScheduleWork(HandleAbort, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::ProcessBlock(ByteSpan & block)
{
    if ((block.data() == nullptr) || block.empty())
    {
        return CHIP_ERROR_INVALID_ARGUMENT;
    }

    CHIP_ERROR err = ProcessHeader(block);

    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "Matter image header parser error %s", chip::ErrorStr(err));
        this->mDownloader->EndDownload(CHIP_ERROR_INVALID_FILE_IDENTIFIER);
        return err;
    }

    // Store block data for HandleProcessBlock to access
    err = SetBlock(block);
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "Cannot set block data: %" CHIP_ERROR_FORMAT, err.Format());
        return err;
    }

    DeviceLayer::PlatformMgr().ScheduleWork(HandleProcessBlock, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

void OTAImageProcessorImpl::HandlePrepareDownload(intptr_t context)
{
    auto * imageProcessor = reinterpret_cast<OTAImageProcessorImpl *>(context);
    if (imageProcessor == nullptr)
    {
        ChipLogError(SoftwareUpdate, "ImageProcessor context is null");
        return;
    }
    else if (imageProcessor->mDownloader == nullptr)
    {
        ChipLogError(SoftwareUpdate, "mDownloader is null");
        return;
    }

    // running this in a thread so won't block main event loop
    ChipLogProgress(SoftwareUpdate, "Q: HandlePrepareDownload");

    qvCHIP_OtaEraseArea();
    qvCHIP_OtaStartWrite();

    // Initialize tracking variables
    imageProcessor->mParams.downloadedBytes = 0;

    imageProcessor->mDownloader->OnPreparedForDownload(CHIP_NO_ERROR);
}

void OTAImageProcessorImpl::HandleFinalize(intptr_t context)
{

    auto * imageProcessor = reinterpret_cast<OTAImageProcessorImpl *>(context);
    if (imageProcessor == nullptr)
    {
        return;
    }

    ChipLogProgress(SoftwareUpdate, "Q: HandleFinalize");

    qvCHIP_OtaSetPendingImage();

    imageProcessor->ReleaseBlock();
    // Start from scratch
    imageProcessor->mParams.downloadedBytes = 0;
}

void OTAImageProcessorImpl::HandleAbort(intptr_t context)
{
    auto * imageProcessor = reinterpret_cast<OTAImageProcessorImpl *>(context);
    if (imageProcessor == nullptr)
    {
        return;
    }

    ChipLogProgress(SoftwareUpdate, "Q: HandleAbort");

    imageProcessor->ReleaseBlock();
    // Start from scratch
    imageProcessor->mParams.downloadedBytes = 0;
}

void OTAImageProcessorImpl::HandleProcessBlock(intptr_t context)
{
    qvCHIP_OtaStatus_t status;
    auto * imageProcessor = reinterpret_cast<OTAImageProcessorImpl *>(context);
    if (imageProcessor == nullptr)
    {
        ChipLogError(SoftwareUpdate, "ImageProcessor context is null");
        return;
    }
    else if (imageProcessor->mDownloader == nullptr)
    {
        ChipLogError(SoftwareUpdate, "mDownloader is null");
        return;
    }

    ChipLogDetail(SoftwareUpdate, "Q: HandleProcessBlock");

    status =
        qvCHIP_OtaWriteChunk(imageProcessor->mParams.downloadedBytes, static_cast<std::uint16_t>(imageProcessor->mBlock.size()),
                             reinterpret_cast<std::uint8_t *>(imageProcessor->mBlock.data()));

    if (status != qvCHIP_OtaStatusSuccess)
    {
        ChipLogError(SoftwareUpdate, "Flash write failed");
        imageProcessor->mDownloader->EndDownload(CHIP_ERROR_WRITE_FAILED);
        return;
    }

    imageProcessor->mParams.downloadedBytes += imageProcessor->mBlock.size();
    imageProcessor->mDownloader->FetchNextData();
}

CHIP_ERROR OTAImageProcessorImpl::SetBlock(ByteSpan & block)
{
    if (!IsSpanUsable(block))
    {
        ReleaseBlock();
        return CHIP_NO_ERROR;
    }
    if (mBlock.size() < block.size())
    {
        if (!mBlock.empty())
        {
            ReleaseBlock();
        }
        uint8_t * mBlock_ptr = static_cast<uint8_t *>(chip::Platform::MemoryAlloc(block.size()));
        if (mBlock_ptr == nullptr)
        {
            return CHIP_ERROR_NO_MEMORY;
        }
        mBlock = MutableByteSpan(mBlock_ptr, block.size());
    }
    CHIP_ERROR err = CopySpanToMutableSpan(block, mBlock);
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "Cannot copy block data: %" CHIP_ERROR_FORMAT, err.Format());
        return err;
    }

    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::ReleaseBlock()
{
    if (mBlock.data() != nullptr)
    {
        chip::Platform::MemoryFree(mBlock.data());
    }

    mBlock = MutableByteSpan();
    return CHIP_NO_ERROR;
}

} // namespace chip