/*
 *
 *    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"
#include "filogic.h"

namespace chip {

CHIP_ERROR OTAImageProcessorImpl::PrepareDownload()
{
    ChipLogProgress(SoftwareUpdate, "OTAImageProcessorImpl::PrepareDownload()");
    DeviceLayer::PlatformMgr().ScheduleWork(HandlePrepareDownload, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

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

CHIP_ERROR OTAImageProcessorImpl::Apply()
{

    ChipLogProgress(SoftwareUpdate, "OTAImageProcessorImpl::Apply()");
    filogic_ota_state_t err = FILOGIC_OTA_SUCCESS;

    filogic_ota_apply_sync(mFilogicCtx, &err);

    if (err != FILOGIC_OTA_SUCCESS)
    {
        ChipLogError(SoftwareUpdate, "OTA image apply fail");
        return CHIP_ERROR_INTERNAL;
    }

    return CHIP_NO_ERROR;
}

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

CHIP_ERROR OTAImageProcessorImpl::ProcessBlock(ByteSpan & block)
{
    CHIP_ERROR err = SetBlock(block);
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "Cannot set block data: %" CHIP_ERROR_FORMAT, err.Format());
    }

    ChipLogProgress(SoftwareUpdate, "OTAImageProcessorImpl::ProcessBlock()");
    DeviceLayer::PlatformMgr().ScheduleWork(HandleProcessBlock, reinterpret_cast<intptr_t>(this));
    return CHIP_NO_ERROR;
}

void OTAImageProcessorImpl::HandlePrepareDownload(intptr_t context)
{
    ChipLogProgress(SoftwareUpdate, "OTAImageProcessorImpl::HandlePrepareDownload()");

    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;
    }

    imageProcessor->mFilogicCtx = DeviceLayer::PlatformMgrImpl().mFilogicCtx;

    filogic_ota_state_t filogic_err;
    filogic_ota_init_sync(imageProcessor->mFilogicCtx, &filogic_err);

    if (filogic_err != FILOGIC_OTA_SUCCESS)
    {
        ChipLogError(SoftwareUpdate, "Filogic ota init fail");
        return;
    }

    imageProcessor->mHeaderParser.Init();
    if (!imageProcessor->mHeaderParser.IsInitialized())
    {
        ChipLogError(SoftwareUpdate, "Header parser init fail!!");
    }
    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;
    }

    imageProcessor->ReleaseBlock();
}

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

    ChipLogProgress(SoftwareUpdate, "OTA image downloaded Abort handler");
    imageProcessor->ReleaseBlock();
}

void OTAImageProcessorImpl::HandleProcessBlock(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;
    }

    ByteSpan block = imageProcessor->mBlock;
    CHIP_ERROR err = imageProcessor->ProcessHeader(block);

    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "OTA process block header fail %" CHIP_ERROR_FORMAT, err.Format());
        imageProcessor->mDownloader->EndDownload(CHIP_ERROR_INVALID_FILE_IDENTIFIER);
        return;
    }

    if (IsSpanUsable(block))
    {
        filogic_ota_state_t filogic_err;
        filogic_ota_io_write_sync(imageProcessor->mFilogicCtx, block.data(), block.size(), &filogic_err);
        if (filogic_err != FILOGIC_OTA_SUCCESS)
        {
            ChipLogError(SoftwareUpdate, "OTA process block fail %d", filogic_err);
            imageProcessor->mDownloader->EndDownload(CHIP_ERROR_WRITE_FAILED);
            return;
        }
    }

    ChipLogProgress(SoftwareUpdate, "OTA downloaded bytes: %ld", static_cast<uint32_t>(imageProcessor->mParams.downloadedBytes));

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

// // Store block data for HandleProcessBlock to access
CHIP_ERROR OTAImageProcessorImpl::SetBlock(ByteSpan & block)
{
    if (!IsSpanUsable(block))
    {
        ReleaseBlock();
        return CHIP_NO_ERROR;
    }

    if (mBlock.size() < block.size())
    {
        ReleaseBlock();

        mBlock = MutableByteSpan(static_cast<uint8_t *>(chip::Platform::MemoryAlloc(block.size())), block.size());
        if (mBlock.data() == nullptr)
        {
            return CHIP_ERROR_NO_MEMORY;
        }
    }

    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;
}

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 currentVersion;
    ReturnErrorOnFailure(DeviceLayer::ConfigurationMgr().GetSoftwareVersion(currentVersion));
    if (currentVersion != requestor->GetTargetVersion())
    {
        return CHIP_ERROR_INCORRECT_STATE;
    }

    return CHIP_NO_ERROR;
}

CHIP_ERROR OTAImageProcessorImpl::ProcessHeader(ByteSpan & block)
{
    ChipLogProgress(SoftwareUpdate, "ProcessHeader enter!!");
    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);
        ChipLogProgress(SoftwareUpdate, "Image Header software version: %ld payload size: %lu", header.mSoftwareVersion,
                        (long unsigned int) header.mPayloadSize);
        mParams.totalFileBytes = header.mPayloadSize;
        mHeaderParser.Clear();
    }

    return CHIP_NO_ERROR;
}

} // namespace chip