/*
 *
 *    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 <ota_fw_upgrade.h>
#include <wiced_hal_wdog.h>

#include "OTAImageProcessorImpl.h"

using namespace chip::System;

namespace chip {

CHIP_ERROR OTAImageProcessorImpl::PrepareDownload()
{
    DeviceLayer::PlatformMgr().ScheduleWork(HandlePrepareDownload, reinterpret_cast<intptr_t>(this));
    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()
{
    DeviceLayer::PlatformMgr().ScheduleWork(HandleApply, reinterpret_cast<intptr_t>(this));
    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;
    }

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

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

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;
    }

    imageProcessor->mHeaderParser.Init();

    if (!wiced_firmware_upgrade_prepare())
    {
        ChipLogError(SoftwareUpdate, "wiced_firmware_upgrade_prepare");
        return;
    }

    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;
    }

    if (!wiced_firmware_upgrade_finalize())
    {
        ChipLogError(SoftwareUpdate, "Failed to finalize OTA upgrade");
        return;
    }

    imageProcessor->ReleaseBlock();

    ChipLogProgress(SoftwareUpdate, "OTA image downloaded");
}

void OTAImageProcessorImpl::HandleApply(intptr_t context)
{
    auto * imageProcessor = reinterpret_cast<OTAImageProcessorImpl *>(context);
    VerifyOrReturn(imageProcessor != nullptr);

    if (!wiced_firmware_upgrade_apply())
    {
        ChipLogError(SoftwareUpdate, "Failed to apply OTA upgrade");
        return;
    }

    ChipLogProgress(SoftwareUpdate, "OTA upgrade completed");

    DeviceLayer::SystemLayer().StartTimer(
        System::Clock::Seconds32(15),
        [](Layer *, void *) {
            ChipLogProgress(SoftwareUpdate, "Rebooting...");
            wiced_hal_wdog_reset_system();
        },
        nullptr);
}

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

    wiced_firmware_upgrade_abort();

    ChipLogError(SoftwareUpdate, "OTA upgrade was aborted");

    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 error = imageProcessor->ProcessHeader(block);
    if (error != CHIP_NO_ERROR)
    {
        ChipLogError(SoftwareUpdate, "Image does not contain a valid header");
        imageProcessor->mDownloader->EndDownload(CHIP_ERROR_INVALID_FILE_IDENTIFIER);
        return;
    }

    if (IsSpanUsable(block))
    {
        const uint32_t written =
            wiced_firmware_upgrade_process_block(imageProcessor->mParams.downloadedBytes, block.data(), block.size());
        if (written != block.size())
        {
            ChipLogError(SoftwareUpdate, "wiced_firmware_upgrade_process_block 0x%08lx", written);
            imageProcessor->mDownloader->EndDownload(CHIP_ERROR_WRITE_FAILED);
            return;
        }
    }

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

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();

        /* Skip inserted zeroes before sections */
        const size_t header_size = mBlock.size() - block.size();
        if (header_size % 4 != 0)
        {
            block = block.SubSpan(4 - header_size % 4);
        }
    }

    return CHIP_NO_ERROR;
}

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