#include "StrHelper.h"

#include <filesystem>
#include <fstream>

#include "mission/utility/Timestamp.h"

StrHelper::StrHelper(object_id_t objectId) : SystemObject(objectId) {}

StrHelper::~StrHelper() {}

ReturnValue_t StrHelper::initialize() {
  sdcMan = SdCardManager::instance();
  if (sdcMan == nullptr) {
    sif::warning << "StrHelper::initialize: Invalid SD Card Manager" << std::endl;
    return RETURN_FAILED;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::performOperation(uint8_t operationCode) {
  ReturnValue_t result = RETURN_OK;
  semaphore.acquire();
  while (true) {
    switch (internalState) {
      case InternalState::IDLE: {
        semaphore.acquire();
        break;
      }
      case InternalState::UPLOAD_IMAGE: {
        result = performImageUpload();
        if (result == RETURN_OK) {
          triggerEvent(IMAGE_UPLOAD_SUCCESSFUL);
        } else {
          triggerEvent(IMAGE_UPLOAD_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      case InternalState::DOWNLOAD_IMAGE: {
        result = performImageDownload();
        if (result == RETURN_OK) {
          triggerEvent(IMAGE_DOWNLOAD_SUCCESSFUL);
        } else {
          triggerEvent(IMAGE_DOWNLOAD_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      case InternalState::FLASH_WRITE: {
        result = performFlashWrite();
        if (result == RETURN_OK) {
          triggerEvent(FLASH_WRITE_SUCCESSFUL);
        } else {
          triggerEvent(FLASH_WRITE_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      case InternalState::FLASH_READ: {
        result = performFlashRead();
        if (result == RETURN_OK) {
          triggerEvent(FLASH_READ_SUCCESSFUL);
        } else {
          triggerEvent(FLASH_READ_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      case InternalState::DOWNLOAD_FPGA_IMAGE: {
        result = performFpgaDownload();
        if (result == RETURN_OK) {
          triggerEvent(FPGA_DOWNLOAD_SUCCESSFUL);
        } else {
          triggerEvent(FPGA_DOWNLOAD_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      case InternalState::UPLOAD_FPGA_IMAGE: {
        result = performFpgaUpload();
        if (result == RETURN_OK) {
          triggerEvent(FPGA_UPLOAD_SUCCESSFUL);
        } else {
          triggerEvent(FPGA_UPLOAD_FAILED);
        }
        internalState = InternalState::IDLE;
        break;
      }
      default:
        sif::debug << "StrHelper::performOperation: Invalid state" << std::endl;
        break;
    }
  }
}

ReturnValue_t StrHelper::setComIF(DeviceCommunicationIF* communicationInterface_) {
  uartComIF = dynamic_cast<UartComIF*>(communicationInterface_);
  if (uartComIF == nullptr) {
    sif::warning << "StrHelper::initialize: Invalid uart com if" << std::endl;
    return RETURN_FAILED;
  }
  return RETURN_OK;
}

void StrHelper::setComCookie(CookieIF* comCookie_) { comCookie = comCookie_; }

ReturnValue_t StrHelper::startImageUpload(std::string fullname) {
  ReturnValue_t result = checkPath(fullname);
  if (result != RETURN_OK) {
    return result;
  }
  uploadImage.uploadFile = fullname;
  if (not std::filesystem::exists(fullname)) {
    return FILE_NOT_EXISTS;
  }
  internalState = InternalState::UPLOAD_FPGA_IMAGE;
  semaphore.release();
  terminate = false;
  return RETURN_OK;
}

ReturnValue_t StrHelper::startImageDownload(std::string path) {
  ReturnValue_t result = checkPath(path);
  if (result != RETURN_OK) {
    return result;
  }
  if (not std::filesystem::exists(path)) {
    return PATH_NOT_EXISTS;
  }
  downloadImage.path = path;
  internalState = InternalState::DOWNLOAD_IMAGE;
  terminate = false;
  semaphore.release();
  return RETURN_OK;
}

void StrHelper::stopProcess() { terminate = true; }

void StrHelper::setDownloadImageName(std::string filename) { downloadImage.filename = filename; }

void StrHelper::setFlashReadFilename(std::string filename) { flashRead.filename = filename; }

void StrHelper::setDownloadFpgaImage(std::string filename) { fpgaDownload.fileName = filename; }

ReturnValue_t StrHelper::startFlashWrite(std::string fullname, uint8_t region, uint32_t address) {
  ReturnValue_t result = checkPath(fullname);
  if (result != RETURN_OK) {
    return result;
  }
  flashWrite.fullname = fullname;
  if (not std::filesystem::exists(flashWrite.fullname)) {
    return FILE_NOT_EXISTS;
  }
  flashWrite.address = address;
  flashWrite.region = region;
  internalState = InternalState::FLASH_WRITE;
  semaphore.release();
  terminate = false;
  return RETURN_OK;
}

ReturnValue_t StrHelper::startFlashRead(std::string path, uint8_t region, uint32_t address,
                                        uint32_t length) {
  ReturnValue_t result = checkPath(path);
  if (result != RETURN_OK) {
    return result;
  }
  flashRead.path = path;
  if (not std::filesystem::exists(flashRead.path)) {
    return FILE_NOT_EXISTS;
  }
  flashRead.address = address;
  flashRead.region = region;
  flashRead.size = length;
  internalState = InternalState::FLASH_READ;
  semaphore.release();
  terminate = false;
  return RETURN_OK;
}

ReturnValue_t StrHelper::startFpgaDownload(std::string path, uint32_t startPosition,
                                           uint32_t length) {
  fpgaDownload.path = path;
  fpgaDownload.startPosition = startPosition;
  fpgaDownload.length = length;
  internalState = InternalState::DOWNLOAD_FPGA_IMAGE;
  semaphore.release();
  terminate = false;
  return RETURN_OK;
}

ReturnValue_t StrHelper::startFpgaUpload(std::string uploadFile) {
  fpgaUpload.uploadFile = uploadFile;
  internalState = InternalState::UPLOAD_FPGA_IMAGE;
  semaphore.release();
  terminate = false;
  return RETURN_OK;
}

ReturnValue_t StrHelper::performImageDownload() {
  ReturnValue_t result;
  struct DownloadActionRequest downloadReq;
  uint32_t size = 0;
  uint32_t retries = 0;
  Timestamp timestamp;
  std::string image = downloadImage.path + "/" + timestamp.str() + downloadImage.filename;
  std::ofstream file(image, std::ios_base::app | std::ios_base::out);
  if (not std::filesystem::exists(image)) {
    return FILE_CREATION_FAILED;
  }
  downloadReq.position = 0;
  while (downloadReq.position < ImageDownload::LAST_POSITION) {
    if (terminate) {
      return RETURN_OK;
    }
    arc_pack_download_action_req(&downloadReq, commandBuffer, &size);
    result = sendAndRead(size, downloadReq.position);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    result = checkActionReply();
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    result = checkReplyPosition(downloadReq.position);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    file.write(reinterpret_cast<const char*>(datalinkLayer.getReply() + IMAGE_DATA_OFFSET),
               IMAGE_DATA_SIZE);
    downloadReq.position++;
    retries = 0;
  }
  file.close();
  return RETURN_OK;
}

ReturnValue_t StrHelper::performImageUpload() {
  ReturnValue_t result = RETURN_OK;
  uint32_t size = 0;
  uint32_t imageSize = 0;
  struct UploadActionRequest uploadReq;
  uploadReq.position = 0;
  std::memset(&uploadReq.data, 0, sizeof(uploadReq.data));
  if (not std::filesystem::exists(uploadImage.uploadFile)) {
    triggerEvent(STR_HELPER_FILE_NOT_EXISTS, static_cast<uint32_t>(internalState));
    internalState = InternalState::IDLE;
    return RETURN_FAILED;
  }
  std::ifstream file(uploadImage.uploadFile, std::ifstream::binary);
  // Set position of next character to end of file input stream
  file.seekg(0, file.end);
  // tellg returns position of character in input stream
  imageSize = file.tellg();
  while ((uploadReq.position + 1) * SIZE_IMAGE_PART < imageSize) {
    if (terminate) {
      return RETURN_OK;
    }
    file.seekg(uploadReq.position * SIZE_IMAGE_PART, file.beg);
    file.read(reinterpret_cast<char*>(uploadReq.data), SIZE_IMAGE_PART);
    arc_pack_upload_action_req(&uploadReq, commandBuffer, &size);
    result = sendAndRead(size, uploadReq.position);
    if (result != RETURN_OK) {
      return RETURN_FAILED;
    }
    result = checkActionReply();
    if (result != RETURN_OK) {
      return result;
    }
    uploadReq.position++;
  }
  std::memset(uploadReq.data, 0, sizeof(uploadReq.data));
  uint32_t remainder = imageSize - uploadReq.position * SIZE_IMAGE_PART;
  file.seekg(uploadReq.position * SIZE_IMAGE_PART, file.beg);
  file.read(reinterpret_cast<char*>(uploadReq.data), remainder);
  file.close();
  uploadReq.position++;
  arc_pack_upload_action_req(&uploadReq, commandBuffer, &size);
  result = sendAndRead(size, uploadReq.position);
  if (result != RETURN_OK) {
    return RETURN_FAILED;
  }
  result = checkActionReply();
  if (result != RETURN_OK) {
    return result;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::performFlashWrite() {
  ReturnValue_t result = RETURN_OK;
  uint32_t size = 0;
  uint32_t remainingBytes = 0;
  uint32_t fileSize = 0;
  struct WriteActionRequest req;
  if (not std::filesystem::exists(flashWrite.fullname)) {
    triggerEvent(STR_HELPER_FILE_NOT_EXISTS, static_cast<uint32_t>(internalState));
    internalState = InternalState::IDLE;
    return RETURN_FAILED;
  }
  std::ifstream file(flashWrite.fullname, std::ifstream::binary);
  file.seekg(0, file.end);
  fileSize = file.tellg();
  remainingBytes = fileSize;
  req.region = flashWrite.region;
  req.address = flashWrite.address;
  req.length = MAX_FLASH_DATA;
  while (remainingBytes >= MAX_FLASH_DATA) {
    if (terminate) {
      return RETURN_OK;
    }
    file.seekg(fileSize - remainingBytes, file.beg);
    file.read(reinterpret_cast<char*>(req.data), MAX_FLASH_DATA);
    arc_pack_write_action_req(&req, commandBuffer, &size);
    result = sendAndRead(size, req.address);
    if (result != RETURN_OK) {
      return RETURN_FAILED;
    }
    result = checkFlashActionReply(req.region, req.address, req.length);
    if (result != RETURN_OK) {
      return result;
    }
    remainingBytes = remainingBytes - MAX_FLASH_DATA;
  }
  file.seekg(fileSize - remainingBytes, file.beg);
  file.read(reinterpret_cast<char*>(req.data), remainingBytes);
  file.close();
  arc_pack_write_action_req(&req, commandBuffer, &size);
  result = sendAndRead(size, req.address);
  if (result != RETURN_OK) {
    return RETURN_FAILED;
  }
  result = checkFlashActionReply(req.region, req.address, req.length);
  if (result != RETURN_OK) {
    return result;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::performFlashRead() {
  ReturnValue_t result;
  struct ReadActionRequest req;
  uint32_t bytesRead = 0;
  uint32_t size = 0;
  uint32_t retries = 0;
  Timestamp timestamp;
  std::string fullname = flashRead.path + "/" + timestamp.str() + flashRead.filename;
  std::ofstream file(fullname, std::ios_base::app | std::ios_base::out);
  if (not std::filesystem::exists(fullname)) {
    return FILE_CREATION_FAILED;
  }
  req.region = flashRead.region;
  while (bytesRead < flashRead.size) {
    if (terminate) {
      return RETURN_OK;
    }
    if ((flashRead.size - bytesRead) < MAX_FLASH_DATA) {
      req.length = flashRead.size - bytesRead;
    } else {
      req.length = MAX_FLASH_DATA;
    }
    req.address = flashRead.address + bytesRead;
    arc_pack_read_action_req(&req, commandBuffer, &size);
    result = sendAndRead(size, req.address);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    result = checkActionReply();
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    result = checkFlashActionReply(req.region, req.address, req.length);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    file.write(reinterpret_cast<const char*>(datalinkLayer.getReply() + FLASH_READ_DATA_OFFSET),
               req.length);
    bytesRead += req.length;
    retries = 0;
  }
  file.close();
  return RETURN_OK;
}

ReturnValue_t StrHelper::performFpgaDownload() {
  ReturnValue_t result;
  struct DownloadFPGAImageActionRequest req;
  uint32_t size = 0;
  uint32_t retries = 0;
  Timestamp timestamp;
  std::string image = fpgaDownload.path + "/" + timestamp.str() + fpgaDownload.fileName;
  std::ofstream file(image, std::ios_base::app | std::ios_base::out);
  if (not std::filesystem::exists(image)) {
    return FILE_CREATION_FAILED;
  }
  req.pos = fpgaDownload.startPosition;
  while (req.pos < fpgaDownload.length) {
    if (terminate) {
      return RETURN_OK;
    }
    if (fpgaDownload.length - req.pos >= FpgaDownload::MAX_DATA) {
      req.length = FpgaDownload::MAX_DATA;
    } else {
      req.length = fpgaDownload.length - req.pos;
    }
    arc_pack_downloadfpgaimage_action_req(&req, commandBuffer, &size);
    result = sendAndRead(size, req.pos);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    result = checkFpgaActionReply(req.pos, req.length);
    if (result != RETURN_OK) {
      if (retries < CONFIG_MAX_DOWNLOAD_RETRIES) {
        uartComIF->flushUartRxBuffer(comCookie);
        retries++;
        continue;
      }
      file.close();
      return result;
    }
    file.write(reinterpret_cast<const char*>(datalinkLayer.getReply() + FpgaDownload::DATA_OFFSET),
               req.length);
    req.pos += req.length;
    retries = 0;
  }
  file.close();
  return RETURN_OK;
}

ReturnValue_t StrHelper::performFpgaUpload() {
  ReturnValue_t result = RETURN_OK;
  uint32_t commandSize = 0;
  uint32_t bytesUploaded = 0;
  uint32_t fileSize = 0;
  struct UploadFPGAImageActionRequest req;
  if (not std::filesystem::exists(fpgaUpload.uploadFile)) {
    triggerEvent(STR_HELPER_FILE_NOT_EXISTS, static_cast<uint32_t>(internalState));
    internalState = InternalState::IDLE;
    return RETURN_FAILED;
  }
  std::ifstream file(flashWrite.fullname, std::ifstream::binary);
  file.seekg(0, file.end);
  fileSize = file.tellg();
  req.pos = 0;
  while (bytesUploaded <= fileSize) {
    if (terminate) {
      return RETURN_OK;
    }
    if (fileSize - bytesUploaded > FpgaUpload::MAX_DATA) {
      req.length = FpgaUpload::MAX_DATA;
    } else {
      req.length = fileSize - bytesUploaded;
    }
    file.seekg(bytesUploaded, file.beg);
    file.read(reinterpret_cast<char*>(req.data), req.length);
    arc_pack_uploadfpgaimage_action_req(&req, commandBuffer, &commandSize);
    result = sendAndRead(commandSize, req.pos);
    if (result != RETURN_OK) {
      return RETURN_FAILED;
    }
    result = checkFpgaActionReply(req.pos, req.length);
    if (result != RETURN_OK) {
      return result;
    }
    bytesUploaded += req.length;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::sendAndRead(size_t size, uint32_t parameter) {
  ReturnValue_t result = RETURN_OK;
  ReturnValue_t decResult = RETURN_OK;
  size_t receivedDataLen = 0;
  uint8_t* receivedData = nullptr;
  size_t bytesLeft = 0;
  uint32_t missedReplies = 0;
  datalinkLayer.encodeFrame(commandBuffer, size);
  result = uartComIF->sendMessage(comCookie, datalinkLayer.getEncodedFrame(),
                                  datalinkLayer.getEncodedLength());
  if (result != RETURN_OK) {
    sif::warning << "StrHelper::sendAndRead: Failed to send packet" << std::endl;
    triggerEvent(STR_HELPER_SENDING_PACKET_FAILED, result, parameter);
    return RETURN_FAILED;
  }
  decResult = ArcsecDatalinkLayer::DEC_IN_PROGRESS;
  while (decResult == ArcsecDatalinkLayer::DEC_IN_PROGRESS) {
    result = uartComIF->requestReceiveMessage(comCookie, StarTracker::MAX_FRAME_SIZE * 2 + 2);
    if (result != RETURN_OK) {
      sif::warning << "StrHelper::sendAndRead: Failed to request reply" << std::endl;
      triggerEvent(STR_HELPER_REQUESTING_MSG_FAILED, result, parameter);
      return RETURN_FAILED;
    }
    result = uartComIF->readReceivedMessage(comCookie, &receivedData, &receivedDataLen);
    if (result != RETURN_OK) {
      sif::warning << "StrHelper::sendAndRead: Failed to read received message" << std::endl;
      triggerEvent(STR_HELPER_READING_REPLY_FAILED, result, parameter);
      return RETURN_FAILED;
    }
    if (receivedDataLen == 0 && missedReplies < MAX_POLLS) {
      missedReplies++;
      continue;
    } else if ((receivedDataLen == 0) && (missedReplies >= MAX_POLLS)) {
      triggerEvent(STR_HELPER_NO_REPLY, parameter);
      return RETURN_FAILED;
    } else {
      missedReplies = 0;
    }
    decResult = datalinkLayer.decodeFrame(receivedData, receivedDataLen, &bytesLeft);
    if (bytesLeft != 0) {
      // This should never happen
      sif::warning << "StrHelper::sendAndRead: Bytes left after decoding" << std::endl;
      triggerEvent(STR_HELPER_COM_ERROR, result, parameter);
      return RETURN_FAILED;
    }
  }
  if (decResult != RETURN_OK) {
    triggerEvent(STR_HELPER_DEC_ERROR, decResult, parameter);
    return RETURN_FAILED;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::checkActionReply() {
  uint8_t type = datalinkLayer.getReplyFrameType();
  if (type != TMTC_ACTIONREPLY) {
    sif::warning << "StrHelper::checkActionReply: Received reply with invalid type ID" << std::endl;
    return INVALID_TYPE_ID;
  }
  uint8_t status = datalinkLayer.getStatusField();
  if (status != ArcsecDatalinkLayer::STATUS_OK) {
    sif::warning << "StrHelper::checkActionReply: Status failure: "
                 << static_cast<unsigned int>(status) << std::endl;
    return STATUS_ERROR;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::checkReplyPosition(uint32_t expectedPosition) {
  uint32_t receivedPosition = 0;
  std::memcpy(&receivedPosition, datalinkLayer.getReply() + POS_OFFSET, sizeof(receivedPosition));
  if (receivedPosition != expectedPosition) {
    triggerEvent(POSITION_MISMATCH, receivedPosition);
    return RETURN_FAILED;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::checkFlashActionReply(uint8_t region_, uint32_t address_,
                                               uint16_t length_) {
  ReturnValue_t result = RETURN_OK;
  result = checkActionReply();
  if (result != RETURN_OK) {
    return result;
  }
  const uint8_t* data = datalinkLayer.getReply();
  uint8_t region = *(data + REGION_OFFSET);
  uint32_t address;
  const uint8_t* addressData = data + ADDRESS_OFFSET;
  size_t size = sizeof(address);
  result =
      SerializeAdapter::deSerialize(&address, &addressData, &size, SerializeIF::Endianness::LITTLE);
  if (result != RETURN_OK) {
    sif::warning << "StrHelper::checkFlashActionReply: Deserialization of address failed"
                 << std::endl;
    return result;
  }
  uint16_t length = 0;
  size = sizeof(length);
  const uint8_t* lengthData = data + LENGTH_OFFSET;
  result =
      SerializeAdapter::deSerialize(&length, lengthData, &size, SerializeIF::Endianness::LITTLE);
  if (result != RETURN_OK) {
    sif::warning << "StrHelper::checkFlashActionReply: Deserialization of length failed"
                 << std::endl;
  }
  if (region != region_) {
    return REGION_MISMATCH;
  }
  if (address != address_) {
    return ADDRESS_MISMATCH;
  }
  if (length != length_) {
    return LENGTH_MISMATCH;
  }
  return RETURN_OK;
}

ReturnValue_t StrHelper::checkFpgaActionReply(uint32_t expectedPosition, uint32_t expectedLength) {
  ReturnValue_t result = RETURN_OK;
  result = checkActionReply();
  if (result != RETURN_OK) {
    return result;
  }
  const uint8_t* data = datalinkLayer.getReply() + ACTION_DATA_OFFSET;
  uint32_t position;
  size_t size = sizeof(position);
  result = SerializeAdapter::deSerialize(&position, &data, &size, SerializeIF::Endianness::LITTLE);
  if (result != RETURN_OK) {
    sif::warning << "StrHelper::checkFpgaActionReply: Deserialization of position failed"
                 << std::endl;
    return result;
  }
  uint32_t length;
  size = sizeof(length);
  result = SerializeAdapter::deSerialize(&length, &data, &size, SerializeIF::Endianness::LITTLE);
  if (result != RETURN_OK) {
    sif::warning << "StrHelper::checkFpgaActionReply: Deserialization of length failed"
                 << std::endl;
    return result;
  }
  return result;
}

ReturnValue_t StrHelper::checkPath(std::string name) {
  if (name.substr(0, sizeof(SdCardManager::SD_0_MOUNT_POINT)) ==
      std::string(SdCardManager::SD_0_MOUNT_POINT)) {
    if (!sdcMan->isSdCardMounted(sd::SLOT_0)) {
      sif::warning << "StrHelper::checkPath: SD card 0 not mounted" << std::endl;
      return SD_NOT_MOUNTED;
    }
  } else if (name.substr(0, sizeof(SdCardManager::SD_1_MOUNT_POINT)) ==
             std::string(SdCardManager::SD_1_MOUNT_POINT)) {
    if (!sdcMan->isSdCardMounted(sd::SLOT_0)) {
      sif::warning << "StrHelper::checkPath: SD card 1 not mounted" << std::endl;
      return SD_NOT_MOUNTED;
    }
  }
  return RETURN_OK;
}