#include <inttypes.h>
#include <uthash.h>
#include "eli.h"

#define errorf(fmt, ...) (fprintf(stderr, fmt, ##__VA_ARGS__))

#define E2E_NONE 0xffffffff

#define E2E_IMAGE_FUNDUS    0x02010201
#define E2E_IMAGE_TOMOGRAM  0x02200201

struct e2e_image {
	size_t size, width, height;
	uint32_t type;

	union {
		const uint8_t *fundus;
		float *tomogram;
	};
};

#define E2E_CHUNK_IMAGE  0x40000000

struct e2e_chunk {
	const char *origin;
	const struct e2e_entry *entry;

	size_t size;
	uint32_t patient_id, study_id, series_id, slice_id, ind;
	uint32_t type;

	union {
		struct e2e_image image;
	};
};

struct e2e_entry {
	const char *start;
	size_t size;

	uint32_t patient_id, study_id, series_id, slice_id, type;

	_Bool has_chunk;
	struct e2e_chunk chunk;
};

struct e2e_fundus {
	size_t size, width, height;

	uint32_t type;
};

struct e2e_directory {
	const char *current, *next;

	size_t num_entries;
	struct e2e_entry *entries;

	eli_header data_list;
};

struct e2e_slice {
	int id;

	struct e2e_image *image;

	UT_hash_handle hh;
};

struct e2e_series {
	int id;

	struct e2e_slice *slices;

	UT_hash_handle hh;
};

struct e2e_study {
	int id;

	struct e2e_series *series;

	UT_hash_handle hh;
};

struct e2e_patient {
	int id; // FIXME: hopefully this doesn't overflow...

	struct e2e_study *studies;

	UT_hash_handle hh;
};

struct e2e_data {
	// file buffer
	const char *start, *end;

	// E2E structure
	struct e2e_directory *dirs;

	// logical structure
	struct e2e_patient *patients;
};


int e2e_read(struct e2e_data *data, const char *start, const char *end);
void e2e_destroy(struct e2e_data *data);