eive-obsw/bsp_q7s/memory/SdCardManager.h

#ifndef BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_
#define BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_

#include "definitions.h"
#include "returnvalues/classIds.h"

#include "fsfw/returnvalues/HasReturnvaluesIF.h"

#include <cstdint>
#include <utility>

class MutexIF;

/**
 * @brief   Manages handling of SD cards like switching them on or off or getting the current
 *          state
 */
class SdCardManager {
    friend class SdCardAccess;
public:
    static constexpr uint8_t INTERFACE_ID = CLASS_ID::SD_CARD_MANAGER;

    static constexpr ReturnValue_t ALREADY_ON = HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 0);
    static constexpr ReturnValue_t ALREADY_OFF = HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 1);
    static constexpr ReturnValue_t STATUS_FILE_NEXISTS =
            HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 2);
    static constexpr ReturnValue_t STATUS_FILE_FORMAT_INVALID =
            HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 3);
    static constexpr ReturnValue_t SYSTEM_CALL_ERROR =
            HasReturnvaluesIF::makeReturnCode(INTERFACE_ID, 4);

    virtual ~SdCardManager();

    static void create();

    /**
     * Returns the single instance of the SD card manager.
     */
    static SdCardManager* instance();

    void setPreferredSdCard(sd::SdCard sdCard);

    sd::SdCard getPreferredSdCard() const;

    /**
     * Switch on the specified SD card
     * @param sdCard
     * @return - RETURN_OK on success, ALREADY_ON if it is already on,
     *           SYSTEM_CALL_ERROR on system error
     */
    ReturnValue_t switchOnSdCard(sd::SdCard sdCard);

    /**
     * Switch off the specified SD card
     * @param sdCard
     * @return - RETURN_OK on success, ALREADY_ON if it is already on,
     *           SYSTEM_CALL_ERROR on system error
     */
    ReturnValue_t switchOffSdCard(sd::SdCard sdCard);

    /**
     * Updated the state file or creates one if it does not exist. You need to call this
     * function before calling #sdCardActiv
     * @return - RETURN_OK if the state file was updated successfully
     *         - SYSTEM_CALL_ERROR if the call to create the status file failed
     */
    ReturnValue_t updateSdCardStateFile();

    /**
     * Get the state of the SD cards. If the state file does not exist, this function will
     * take care of updating it. If it does not, the function will use the state file to get
     * the status of the SD cards and set the field of the provided boolean pair.
     * @param active Pair of booleans, where the first entry is the state of the first SD card
     * and the second one the state of the second SD card
     * @return - RETURN_OK if the state was read successfully
     *         - STATUS_FILE_FORMAT_INVALID if there was an issue with the state file. The user
     *           should call #updateSdCardStateFile again in that case
     *         - STATUS_FILE_NEXISTS if the status file does not exist
     */
    ReturnValue_t sdCardActive(std::pair<bool, bool>& active);

    sd::SdCard getPreferedSdCard() const;

private:
    SdCardManager();

    ReturnValue_t setSdCardState(sd::SdCard sdCard, bool on);

    sd::SdCard preferredSdCard = sd::SdCard::SLOT_0;

    static SdCardManager* factoryInstance;
};

#endif /* BSP_Q7S_MEMORY_SDCARDACCESSMANAGER_H_ */