#pragma once

#include <stdbool.h>
#include "espfsformat.h"

typedef enum {
	ESPFS_INIT_RESULT_OK,
	ESPFS_INIT_RESULT_NO_IMAGE,
	ESPFS_INIT_RESULT_BAD_ALIGN,
} EspFsInitResult;

typedef struct EspFsFile EspFsFile;

struct EspFsWalk {
  uint32_t hpos;
};
typedef struct EspFsWalk EspFsWalk;

/** Init filesystem walk */
void espFsWalkInit(EspFsWalk *walk);
/**
 * Advance in the filesystem walk
 *
 * header - the next file's header is read here
 * namebuf - the name is read here
 * filepos - the file header's pos is copied here, if not NULL
 */
bool espFsWalkNext(EspFsWalk *walk, EspFsHeader *header, char *namebuf, size_t namebuf_cap, uint32_t *filepos);
/** Open a file with header starting at the given position */
EspFsFile *espFsOpenAt(uint32_t hpos);
/**
 * Open a file using an already read header and it's offset.
 * This is the same function as espFsOpenAt, but avoids reading the header again if already read.
 */
EspFsFile *espFsOpenFromHeader(EspFsHeader *h, uint32_t hpos);

EspFsInitResult espFsInit();
EspFsFile *espFsOpen(const char *fileName);
int espFsFlags(EspFsFile *fh);
int espFsRead(EspFsFile *fh, char *buff, size_t len);
void espFsClose(EspFsFile *fh);