/* att_internal.h - Attribute protocol handling */

/*
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#define BT_ATT_DEFAULT_LE_MTU 23

#if BT_L2CAP_RX_MTU < CONFIG_BT_L2CAP_TX_MTU
#define BT_ATT_MTU BT_L2CAP_RX_MTU
#else
#define BT_ATT_MTU CONFIG_BT_L2CAP_TX_MTU
#endif

struct bt_att_hdr {
    u8_t code;
} __packed;

#define BT_ATT_OP_ERROR_RSP 0x01
struct bt_att_error_rsp {
    u8_t request;
    u16_t handle;
    u8_t error;
} __packed;

#define BT_ATT_OP_MTU_REQ 0x02
struct bt_att_exchange_mtu_req {
    u16_t mtu;
} __packed;

#define BT_ATT_OP_MTU_RSP 0x03
struct bt_att_exchange_mtu_rsp {
    u16_t mtu;
} __packed;

/* Find Information Request */
#define BT_ATT_OP_FIND_INFO_REQ 0x04
struct bt_att_find_info_req {
    u16_t start_handle;
    u16_t end_handle;
} __packed;

/* Format field values for BT_ATT_OP_FIND_INFO_RSP */
#define BT_ATT_INFO_16  0x01
#define BT_ATT_INFO_128 0x02

struct bt_att_info_16 {
    u16_t handle;
    u16_t uuid;
} __packed;

struct bt_att_info_128 {
    u16_t handle;
    u8_t uuid[16];
} __packed;

/* Find Information Response */
#define BT_ATT_OP_FIND_INFO_RSP 0x05
struct bt_att_find_info_rsp {
    u8_t format;
    u8_t info[0];
} __packed;

/* Find By Type Value Request */
#define BT_ATT_OP_FIND_TYPE_REQ 0x06
struct bt_att_find_type_req {
    u16_t start_handle;
    u16_t end_handle;
    u16_t type;
    u8_t value[0];
} __packed;

struct bt_att_handle_group {
    u16_t start_handle;
    u16_t end_handle;
} __packed;

/* Find By Type Value Response */
#define BT_ATT_OP_FIND_TYPE_RSP 0x07
struct bt_att_find_type_rsp {
    struct bt_att_handle_group list[0];
} __packed;

/* Read By Type Request */
#define BT_ATT_OP_READ_TYPE_REQ 0x08
struct bt_att_read_type_req {
    u16_t start_handle;
    u16_t end_handle;
    u8_t uuid[0];
} __packed;

struct bt_att_data {
    u16_t handle;
    u8_t value[0];
} __packed;

/* Read By Type Response */
#define BT_ATT_OP_READ_TYPE_RSP 0x09
struct bt_att_read_type_rsp {
    u8_t len;
    struct bt_att_data data[0];
} __packed;

/* Read Request */
#define BT_ATT_OP_READ_REQ 0x0a
struct bt_att_read_req {
    u16_t handle;
} __packed;

/* Read Response */
#define BT_ATT_OP_READ_RSP 0x0b
struct bt_att_read_rsp {
    u8_t value[0];
} __packed;

/* Read Blob Request */
#define BT_ATT_OP_READ_BLOB_REQ 0x0c
struct bt_att_read_blob_req {
    u16_t handle;
    u16_t offset;
} __packed;

/* Read Blob Response */
#define BT_ATT_OP_READ_BLOB_RSP 0x0d
struct bt_att_read_blob_rsp {
    u8_t value[0];
} __packed;

/* Read Multiple Request */
#define BT_ATT_READ_MULT_MIN_LEN_REQ 0x04

#define BT_ATT_OP_READ_MULT_REQ 0x0e
struct bt_att_read_mult_req {
    u16_t handles[0];
} __packed;

/* Read Multiple Respose */
#define BT_ATT_OP_READ_MULT_RSP 0x0f
struct bt_att_read_mult_rsp {
    u8_t value[0];
} __packed;

/* Read by Group Type Request */
#define BT_ATT_OP_READ_GROUP_REQ 0x10
struct bt_att_read_group_req {
    u16_t start_handle;
    u16_t end_handle;
    u8_t uuid[0];
} __packed;

struct bt_att_group_data {
    u16_t start_handle;
    u16_t end_handle;
    u8_t value[0];
} __packed;

/* Read by Group Type Response */
#define BT_ATT_OP_READ_GROUP_RSP 0x11
struct bt_att_read_group_rsp {
    u8_t len;
    struct bt_att_group_data data[0];
} __packed;

/* Write Request */
#define BT_ATT_OP_WRITE_REQ 0x12
struct bt_att_write_req {
    u16_t handle;
    u8_t value[0];
} __packed;

/* Write Response */
#define BT_ATT_OP_WRITE_RSP 0x13

/* Prepare Write Request */
#define BT_ATT_OP_PREPARE_WRITE_REQ 0x16
struct bt_att_prepare_write_req {
    u16_t handle;
    u16_t offset;
    u8_t value[0];
} __packed;

/* Prepare Write Respond */
#define BT_ATT_OP_PREPARE_WRITE_RSP 0x17
struct bt_att_prepare_write_rsp {
    u16_t handle;
    u16_t offset;
    u8_t value[0];
} __packed;

/* Execute Write Request */
#define BT_ATT_FLAG_CANCEL 0x00
#define BT_ATT_FLAG_EXEC   0x01

#define BT_ATT_OP_EXEC_WRITE_REQ 0x18
struct bt_att_exec_write_req {
    u8_t flags;
} __packed;

/* Execute Write Response */
#define BT_ATT_OP_EXEC_WRITE_RSP 0x19

/* Handle Value Notification */
#define BT_ATT_OP_NOTIFY 0x1b
struct bt_att_notify {
    u16_t handle;
    u8_t value[0];
} __packed;

/* Handle Value Indication */
#define BT_ATT_OP_INDICATE 0x1d
struct bt_att_indicate {
    u16_t handle;
    u8_t value[0];
} __packed;

/* Handle Value Confirm */
#define BT_ATT_OP_CONFIRM 0x1e

struct bt_att_signature {
    u8_t value[12];
} __packed;

/* Write Command */
#define BT_ATT_OP_WRITE_CMD 0x52
struct bt_att_write_cmd {
    u16_t handle;
    u8_t value[0];
} __packed;

/* Signed Write Command */
#define BT_ATT_OP_SIGNED_WRITE_CMD 0xd2
struct bt_att_signed_write_cmd {
    u16_t handle;
    u8_t value[0];
} __packed;

void att_pdu_sent(struct bt_conn *conn, void *user_data);

void att_cfm_sent(struct bt_conn *conn, void *user_data);

void att_rsp_sent(struct bt_conn *conn, void *user_data);

void att_req_sent(struct bt_conn *conn, void *user_data);

void bt_att_init(void);
u16_t bt_att_get_mtu(struct bt_conn *conn);

#if defined(CONFIG_BLE_AT_CMD)
void set_mtu_size(u16_t size);
#endif

struct net_buf *bt_att_create_pdu(struct bt_conn *conn, u8_t op,
                                  size_t len);

/* Send ATT PDU over a connection */
int bt_att_send(struct bt_conn *conn, struct net_buf *buf, bt_conn_tx_cb_t cb,
                void *user_data);

/* Send ATT Request over a connection */
int bt_att_req_send(struct bt_conn *conn, struct bt_att_req *req);

/* Cancel ATT request */
void bt_att_req_cancel(struct bt_conn *conn, struct bt_att_req *req);
