#ifndef ZDATACHANNEL_H__
#define ZDATACHANNEL_H__

#include <stdbool.h>
#include <stdint.h>

#include "ble.h"
#include "ble_link_ctx_manager.h"
#include "ble_srv_common.h"
#include "nrf_sdh_ble.h"
#include "sdk_config.h"

#ifdef __cplusplus
extern "C" {
#endif

/**@brief   Macro for defining a ble_nus instance.
 *
 * @param     _name            Name of the instance.
 * @param[in] _nus_max_clients Maximum number of NUS clients connected at a time.
 * @hideinitializer
 */
#define ZDATACHANNEL_DEF(_name, _ble_observer_prio, _nus_max_clients) \
  static zdatachannel_t _name;                                        \
  NRF_SDH_BLE_OBSERVER(_name##_obs, _ble_observer_prio, zdatachannel_on_ble_evt, &_name)

#define OPCODE_LENGTH 1
#define HANDLE_LENGTH 2

/**@brief   Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
#if defined(NRF_SDH_BLE_GATT_MAX_MTU_SIZE) && (NRF_SDH_BLE_GATT_MAX_MTU_SIZE != 0)
#define ZDATACHANNEL_MAX_DATA_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH)
#else
#define ZDATACHANNEL_MAX_DATA_LEN (BLE_GATT_MTU_SIZE_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH)
#warning NRF_SDH_BLE_GATT_MAX_MTU_SIZE is not defined.
#endif

/**@brief   Nordic UART Service event types. */
typedef enum {
  ZDATACHANNEL_EVT_RX_DATA, /**< Data received. */
} zdatachannel_evt_type_t;

typedef struct zdatachannel_s zdatachannel_t;

typedef struct {
  uint8_t const* p_data; /**< A pointer to the buffer with received data. */
  uint16_t       length; /**< Length of received data. */
} zdatachannel_evt_rx_data_t;

typedef struct {
  zdatachannel_evt_type_t type; /**< Event type. */
  union {
    zdatachannel_evt_rx_data_t rx_data; /**< @ref ZDATACHANNEL_EVT_RX_DATA event data. */
  } params;
} zdatachannel_evt_t;

typedef void (*zdatachannel_data_handler_t)(zdatachannel_evt_t* p_evt);

typedef struct {
  zdatachannel_data_handler_t data_handler;
} zdatachannel_init_t;

struct zdatachannel_s {
  uint8_t                     uuid_type;            /**< UUID type for Nordic UART Service Base UUID. */
  uint16_t                    service_handle;       /**< Handle of Nordic UART Service (as provided by the SoftDevice). */
  ble_gatts_char_handles_t    cmd_tx_handles;       /**< 指令发送句柄 */
  ble_gatts_char_handles_t    cmd_rx_handles;       /**< 指令接收句柄 */
  ble_gatts_char_handles_t    datablock_tx_handles; /**< 数据块发送句柄 */
  zdatachannel_data_handler_t data_handler;         /**< Event handler to be called for handling received data. */

  // 状态
  int16_t conn_handle;
  bool    cmd_tx_channel_is_notification_enabled;
  bool    datablock_tx_channel_is_notification_enabled;
};

uint32_t zdatachannel_init(zdatachannel_t* p_nus, zdatachannel_init_t const* p_nus_init);
void     zdatachannel_on_ble_evt(ble_evt_t const* p_ble_evt, void* p_context);

uint32_t zdatachannel_data_send(uint8_t* p_data, uint16_t* p_length);
uint32_t zdatachannel_block_data_send(uint8_t* p_data, uint16_t* p_length);

#ifdef __cplusplus
}
#endif

#endif  // ZDATACHANNEL_H__

/** @} */