#ifndef MISSION_TMTC_TMSTOREBACKEND_H_
#define MISSION_TMTC_TMSTOREBACKEND_H_

#include <fsfw/objectmanager/SystemObject.h>
#include <fsfw/storagemanager/StorageManagerIF.h>
#include <fsfw/timemanager/CdsShortTimeStamper.h>
#include <fsfw/tmstorage/TmStoreFrontendSimpleIF.h>
#include <fsfw/tmtcpacket/pus/tm/PusTmReader.h>
#include <fsfw/tmtcservices/AcceptsTelemetryIF.h>
#include <mission/memory/SdCardMountedIF.h>
#include <mission/tmtc/DirectTmSinkIF.h>

#include <filesystem>

#include "eive/eventSubsystemIds.h"
#include "eive/resultClassIds.h"

enum class RolloverInterval { MINUTELY, HOURLY, DAILY };

struct PersistentTmStoreArgs {
  PersistentTmStoreArgs(object_id_t objectId, const char* baseDir, std::string baseName,
                        RolloverInterval intervalUnit, uint32_t intervalCount,
                        StorageManagerIF& tmStore, SdCardMountedIF& sdcMan)
      : objectId(objectId),
        baseDir(baseDir),
        baseName(baseName),
        intervalUnit(intervalUnit),
        intervalCount(intervalCount),
        tmStore(tmStore),
        sdcMan(sdcMan) {}

  object_id_t objectId;
  const char* baseDir;
  std::string baseName;
  RolloverInterval intervalUnit;
  uint32_t intervalCount;
  StorageManagerIF& tmStore;
  SdCardMountedIF& sdcMan;
};

class PersistentTmStore : public TmStoreFrontendSimpleIF, public SystemObject {
 public:
  enum class State { IDLE, DUMPING };
  static constexpr uint8_t INTERFACE_ID = CLASS_ID::PERSISTENT_TM_STORE;
  static constexpr ReturnValue_t DUMP_DONE = returnvalue::makeCode(INTERFACE_ID, 0);
  static constexpr ReturnValue_t BUSY_DUMPING = returnvalue::makeCode(INTERFACE_ID, 1);

  static constexpr uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PERSISTENT_TM_STORE;

  //! [EXPORT] : [COMMENT]
  //! P1: Result code of TM packet parser.
  //! P2: Timestamp of possibly corrupt file as a unix timestamp.
  static constexpr Event POSSIBLE_FILE_CORRUPTION =
      event::makeEvent(SUBSYSTEM_ID, 0, severity::LOW);
  //! [EXPORT] : [COMMENT] File in store too large. P1: Detected file size
  //! P2: Allowed file size
  static constexpr Event FILE_TOO_LARGE = event::makeEvent(SUBSYSTEM_ID, 1, severity::LOW);
  static constexpr Event BUSY_DUMPING_EVENT = event::makeEvent(SUBSYSTEM_ID, 2, severity::INFO);

  PersistentTmStore(PersistentTmStoreArgs args);

  ReturnValue_t initializeTmStore();
  State getState() const;
  ReturnValue_t handleCommandQueue(StorageManagerIF& ipcStore);

  void deleteUpTo(uint32_t unixSeconds);
  ReturnValue_t startDumpFrom(uint32_t fromUnixSeconds);
  ReturnValue_t startDumpFromUpTo(uint32_t fromUnixSeconds, uint32_t upToUnixSeconds);
  ReturnValue_t dumpNextPacket(DirectTmSinkIF& tmSink, size_t& dumpedLen);

  ReturnValue_t storePacket(PusTmReader& reader);

 protected:
  StorageManagerIF& tmStore;

 private:
  static constexpr uint8_t MAX_FILES_IN_ONE_SECOND = 10;
  static constexpr size_t MAX_FILESIZE = 8192;
  // ISO8601 timestamp.
  static constexpr char FILE_DATE_FORMAT[] = "%FT%H%M%SZ";

  //! [EXPORT] : [SKIP]
  static constexpr ReturnValue_t INVALID_FILE_DETECTED_AND_DELETED = returnvalue::makeCode(2, 1);

  MessageQueueIF* tcQueue;
  State state = State::IDLE;
  // PacketFilter filter;
  CdsShortTimeStamper timeReader;
  bool baseDirUninitialized = true;
  const char* baseDir;
  std::string baseName;
  uint8_t currentSameSecNumber = 0;
  std::filesystem::path basePath;
  uint32_t rolloverDiffSeconds = 0;
  std::array<uint8_t, MAX_FILESIZE> fileBuf{};
  timeval currentTv;
  timeval activeFileTv{};

  struct ActiveDumpParams {
    uint32_t fromUnixTime = 0;
    uint32_t untilUnixTime = 0;
    uint32_t currentFileUnixStamp = 0;
    std::filesystem::directory_iterator dirIter;
    std::filesystem::directory_entry dirEntry;
    size_t fileSize = 0;
    size_t currentSize = 0;
  };
  ActiveDumpParams dumpParams;
  std::optional<std::filesystem::path> activeFile;
  SdCardMountedIF& sdcMan;

  /**
   * To get the queue where commands shall be sent.
   * @return  Id of command queue.
   */
  [[nodiscard]] MessageQueueId_t getCommandQueue() const override;

  void calcDiffSeconds(RolloverInterval intervalUnit, uint32_t intervalCount);
  ReturnValue_t createMostRecentFile(std::optional<uint8_t> suffix);
  static ReturnValue_t pathToTime(const std::filesystem::path& path, struct tm& time);
  void fileToPackets(const std::filesystem::path& path, uint32_t unixStamp);
  ReturnValue_t loadNextDumpFile();
  bool updateBaseDir();
  ReturnValue_t assignAndOrCreateMostRecentFile();
};

#endif /* MISSION_TMTC_TMSTOREBACKEND_H_ */