#include <stdint.h>

#include "host/ble_att.h"
#include "host/ble_gatt.h"
#include "os/os_mbuf.h"
#include "esp_log.h"

#include "gatt_svcs.h"
#include "BLE_UUID.h"

static struct char_pres_format current_char_pres_format = {
  .format = FORMAT_UINT32,
  .exponent = -3,
  .unit = AMPERE_UNIT_UUID,
  .namespc = 1,
  .descrH = NSP_DESC_MAIN & 0xff,
  .descrL = (NSP_DESC_MAIN>>8) & 0xff,
};

static struct char_pres_format raw_voltage_char_pres_format = {
  .format = FORMAT_UINT32,
  .exponent = -3,
  .unit = VOLTS_UNIT_UUID,
  .namespc = 1,
  .descrH = NSP_DESC_MAIN & 0xff,
  .descrL = (NSP_DESC_MAIN>>8) & 0xff,
};

int gatt_char_access_cs(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg){
  int rc = 0;
  
  switch(ctxt->op){
    case BLE_GATT_ACCESS_OP_READ_CHR:
      ;
      uint32_t data = 12;
      rc = os_mbuf_append(ctxt->om, &data, sizeof(data));
    break;
    case BLE_GATT_ACCESS_OP_READ_DSC:
      ESP_LOGI("CHAR ACCESS", "char pres size %d", sizeof(current_char_pres_format));
      rc = os_mbuf_append(ctxt->om, &current_char_pres_format, CHAR_PRESENTATION_FORMAT_SIZE);
    break;
  }

  return rc ? BLE_ATT_ERR_INSUFFICIENT_RES : 0;
}

int gatt_char_access_ev(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt* ctxt, void* arg){
  int rc = 0;

  switch(ctxt->op){
    case BLE_GATT_ACCESS_OP_READ_CHR:
      ;
      uint16_t* handles = arg;
  
      int id = -1;
      for(int i = 0; i < EV_CHRS_NUM; i++) if(handles[i] == attr_handle) id = i;
      uint32_t data = id;
      rc = os_mbuf_append(ctxt->om, &data, sizeof(data));
    break;
    case BLE_GATT_ACCESS_OP_READ_DSC:
      rc = os_mbuf_append(ctxt->om, &raw_voltage_char_pres_format, CHAR_PRESENTATION_FORMAT_SIZE);
    break;
  }

  return rc ? BLE_ATT_ERR_INSUFFICIENT_RES : 0;
}