#pragma once

#include "driver/sdmmc_types.h"
#include "driver/sdspi_host.h"
#include "esp_err.h"
#include "esp_vfs_fat.h"
#include "gpio-expander.h"

namespace gay_ipod {

static const char *kStoragePath = "/sd";
static const uint8_t kMaxOpenFiles = 8;

class SdStorage {
  public:
    SdStorage(GpioExpander *gpio);
    ~SdStorage();

    enum Error {
      OK,
      /** We couldn't interact with the SD card at all. Is it missing? */
      FAILED_TO_READ,
      /** We couldn't mount the SD card. Is it formatted? */
      FAILED_TO_MOUNT,
    };

    // FIXME: these methods should also handling powering the SD card up and
    // down once we have that capability.

    /**
     * Initialises the SDSPI driver and mounts the SD card for reading and
     * writing. This must be called before any interactions with the underlying
     * storage.
     */
    Error Acquire(void);

    /**
     * Unmounts the SD card and frees memory associated with the SDSPI driver.
     */
    void Release(void);

    // Not copyable or movable.
    // TODO: maybe this could be movable?
    SdStorage(const SdStorage&) = delete;
    SdStorage& operator=(const SdStorage&) = delete;

  private:
    GpioExpander *gpio_;

    // SPI and SD driver info
    sdspi_dev_handle_t handle_;
    sdmmc_host_t host_;
    sdmmc_card_t card_;

    // Filesystem info
    FATFS *fs_ = nullptr;
};

} // namespace gay_ipod