#ifndef __CONFIGULATOR_H__
#define __CONFIGULATOR_H__

#include <stdint.h>

#define CFGLR_BACKENDS_MAX  (04)
#define CFGLR_ELEMENTS_MAX  (12)
#define CFGLR_SIGNALERS_MAX (04)

typedef enum {
  CFGLR_SIGNAL_LOADED = 0,
  CFGLR_SIGNAL_CHANGE,
  CFGLR_SIGNAL_DELETE,
} cfglr_signal_e;

typedef enum {
  CFGLR_DATATYPE_U8 = 0,
  CFGLR_DATATYPE_I8,
  CFGLR_DATATYPE_U16,
  CFGLR_DATATYPE_I16,
  CFGLR_DATATYPE_U32,
  CFGLR_DATATYPE_I32,
  CFGLR_DATATYPE_U64,
  CFGLR_DATATYPE_I64,
  CFGLR_DATATYPE_STR,
  CFGLR_DATATYPE_BIN,
} cfglr_datatype_e;

#define CFGLR_DATATYPE_COUNT (uint8_t)(CFGLR_DATATYPE_BIN - CFGLR_DATATYPE_U8)

typedef struct cfglr_signaler cfglr_signaler_t;
typedef struct cfglr_handle_struct cfglr_handle_t;
typedef struct cfglr_element cfglr_element_t;

typedef void (*cfglr_signaler_init_t)(cfglr_signaler_t *signaler, cfglr_element_t *element, cfglr_handle_t *handle);
typedef void (*cfglr_signaler_dispatch_t)(cfglr_signaler_t *signaler, cfglr_element_t *element, cfglr_signal_e sig);

struct cfglr_signaler {
  const char *key;
  cfglr_signaler_dispatch_t dispatch;
  cfglr_signaler_init_t init;
  void *handle;
};

struct cfglr_element {
  const char *key;
  uint8_t dirty;
  uint8_t signaler_count;
  cfglr_datatype_e datatype;
  // TODO precalcualte sizes in an array and use datatype enum to look up
  uint8_t datatype_size;
  uint8_t default_size;
  void *data;
  void *default_data;
  cfglr_handle_t *handle;
  cfglr_signaler_t signalers[CFGLR_SIGNALERS_MAX];
};

#define CFGLR_ELEMENT(KEY, TYPE, SIZE, DEFAULT, DEF_SIZE, SIGNALERS...) (cfglr_element_t){\
  .key = KEY,\
  .datatype = TYPE,\
  .datatype_size = SIZE,\
  .default_data = (void*)DEFAULT,\
  .default_size = DEF_SIZE,\
  .signalers = {\
    SIGNALERS,\
    { NULL }\
  }\
}

#define CFGLR_ELEMENT_U8(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_U8, sizeof(uint8_t), DEFAULT, 1, SIGNALERS)
#define CFGLR_ELEMENT_I8(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_I8, sizeof(int8_t), DEFAULT, 1, SIGNALERS)
#define CFGLR_ELEMENT_U16(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_U16, sizeof(uint16_t), DEFAULT, 2, SIGNALERS)
#define CFGLR_ELEMENT_I16(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_I16, sizeof(int16_t), DEFAULT, 2, SIGNALERS)
#define CFGLR_ELEMENT_U32(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_U32, sizeof(uint32_t), DEFAULT, 4, SIGNALERS)
#define CFGLR_ELEMENT_I32(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_I32, sizeof(int32_t), DEFAULT, 4, SIGNALERS)
#define CFGLR_ELEMENT_U64(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_U64, sizeof(uint64_t), DEFAULT, 8, SIGNALERS)
#define CFGLR_ELEMENT_I64(KEY, DEFAULT, SIGNALERS...) CFGLR_ELEMENT(KEY, CFGLR_DATATYPE_I64, sizeof(int64_t), DEFAULT, 8, SIGNALERS)

typedef struct cfglr_backend cfglr_backend_t;

typedef void (*cfglr_backend_open_t)(cfglr_backend_t *backend, cfglr_handle_t *handle);
typedef void (*cfglr_backend_close_t)(cfglr_backend_t *backend, cfglr_handle_t *handle);
typedef uint16_t (*cfglr_backend_get_t)(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handle);
typedef uint16_t (*cfglr_backend_set_t)(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handle);

uint16_t cfglr_commit(cfglr_element_t *element);
uint16_t cfglr_commit_data(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handle);

struct cfglr_backend {
  cfglr_backend_open_t open;
  cfglr_backend_close_t close;
  cfglr_backend_get_t get;
  cfglr_backend_set_t set;
  void *handle;
};

#define CFGLR_BACKEND(OPEN, CLOSE, GET, SET) {\
  .open = OPEN,\
  .close = CLOSE,\
  .get = GET,\
  .set = SET,\
}

struct cfglr_handle_struct {
  const char *namespace;
  // TODO cleanup, what is store_default for?
  uint8_t store_default;
  uint8_t backend_count;
  uint8_t element_count;
  cfglr_backend_t backend;
  cfglr_element_t elements[CFGLR_ELEMENTS_MAX];
};

uint8_t cfglr_init(cfglr_handle_t *handle);
uint8_t cfglr_fetch_data(cfglr_backend_t *backend, cfglr_element_t *element, cfglr_handle_t *handler);

#include "cfglr_nvs.h"
#include "cfglr_signaler_idf_event.h"
#include "cfglr_signaler_lvgl.h"

#endif//__CONFIGULATOR_H__