/******************************************************************************
 *
 *  Copyright (C) 2009-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  Changes from Qualcomm Innovation Center are provided under the following license:
 *
 *  Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted (subject to the limitations in the
 *  disclaimer below) provided that the following conditions are met:
 *  Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above
 *  copyright notice, this list of conditions and the following
 *  disclaimer in the documentation and/or other materials provided
 *  with the distribution.
 *
 *  Neither the name of Qualcomm Innovation Center, Inc. nor the names of its
 *  contributors may be used to endorse or promote products derived
 *  from this software without specific prior written permission.
 *
 *  NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
 *  GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
 *  HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 *  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 *  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  this file contains GATT utility functions
 *
 ******************************************************************************/
#include "bt_target.h"
#include "bt_utils.h"
#include "osi/include/osi.h"
#include "osi/include/properties.h"

#include <string.h>
#include "bt_common.h"
#include "stdio.h"

#include "btm_int.h"
#include "connection_manager.h"
#include "gatt_api.h"
#include "gatt_int.h"
#include "gattdefs.h"
#include "l2cdefs.h"
#include "l2c_api.h"
#include "sdp_api.h"
#include "stack/gatt/connection_manager.h"
#include "stack/gatt/eatt_int.h"
#include "btif_storage.h"
#include "stack_config.h"

#include <vector>
#include <algorithm>

#include "device/include/interop_config.h"

using base::StringPrintf;
using bluetooth::Uuid;

/* check if [x, y] and [a, b] have overlapping range */
#define GATT_VALIDATE_HANDLE_RANGE(x, y, a, b) ((y) >= (a) && (x) <= (b))

#define GATT_GET_NEXT_VALID_HANDLE(x) (((x) / 10 + 1) * 10)

const char* const op_code_name[] = {"UNKNOWN",
                                    "ATT_RSP_ERROR",
                                    "ATT_REQ_MTU",
                                    "ATT_RSP_MTU",
                                    "ATT_REQ_READ_INFO",
                                    "ATT_RSP_READ_INFO",
                                    "ATT_REQ_FIND_TYPE_VALUE",
                                    "ATT_RSP_FIND_TYPE_VALUE",
                                    "ATT_REQ_READ_BY_TYPE",
                                    "ATT_RSP_READ_BY_TYPE",
                                    "ATT_REQ_READ",
                                    "ATT_RSP_READ",
                                    "ATT_REQ_READ_BLOB",
                                    "ATT_RSP_READ_BLOB",
                                    "GATT_REQ_READ_MULTI",
                                    "GATT_RSP_READ_MULTI",
                                    "GATT_REQ_READ_BY_GRP_TYPE",
                                    "GATT_RSP_READ_BY_GRP_TYPE",
                                    "ATT_REQ_WRITE",
                                    "ATT_RSP_WRITE",
                                    "ATT_CMD_WRITE",
                                    "ATT_SIGN_CMD_WRITE",
                                    "ATT_REQ_PREPARE_WRITE",
                                    "ATT_RSP_PREPARE_WRITE",
                                    "ATT_REQ_EXEC_WRITE",
                                    "ATT_RSP_EXEC_WRITE",
                                    "Reserved",
                                    "ATT_HANDLE_VALUE_NOTIF",
                                    "Reserved",
                                    "ATT_HANDLE_VALUE_IND",
                                    "ATT_HANDLE_VALUE_CONF",
                                    "Reserved",
                                    "GATT_REQ_READ_MULTI_VARIABLE",
                                    "GATT_RSP_READ_MULTI_VARIABLE",
                                    "Reserved",
                                    "GATT_MULTI_HANDLE_VALUE_NOTIF",
                                    "ATT_OP_CODE_MAX"};

/*******************************************************************************
 *
 * Function         gatt_free_pending_ind
 *
 * Description    Free all pending indications
 *
 * Returns       None
 *
 ******************************************************************************/
void gatt_free_pending_ind(tGATT_TCB* p_tcb, uint16_t lcid) {
  VLOG(1) << __func__ << " lcid:" << +lcid;
  fixed_queue_t** pending_ind_q = &(p_tcb->pending_ind_q); // L2CAP_ATT_CID
  tGATT_EBCB* p_eatt_bcb;

  if (p_tcb->is_eatt_supported && (lcid != L2CAP_ATT_CID)) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_cid(p_tcb, lcid);
    if (p_eatt_bcb)
      pending_ind_q = &(p_eatt_bcb->pending_ind_q);
    else {
      VLOG(1) << __func__ << " EATT BCB not found for lcid:" << +lcid;
      return;
    }
  }

  if (*pending_ind_q == NULL) {
    VLOG(1) << __func__ << " pending_ind_q is null";
    return;
  }

  /* release all queued indications */
  while (!fixed_queue_is_empty(*pending_ind_q))
    osi_free(fixed_queue_try_dequeue(*pending_ind_q));
  fixed_queue_free(*pending_ind_q, NULL);
  *pending_ind_q = NULL;
}

/*******************************************************************************
 *
 * Function         gatt_delete_dev_from_srv_chg_clt_list
 *
 * Description    Delete a device from the service changed client lit
 *
 * Returns       None
 *
 ******************************************************************************/
void gatt_delete_dev_from_srv_chg_clt_list(const RawAddress& bd_addr) {
  VLOG(1) << __func__;

  tGATTS_SRV_CHG* p_buf = gatt_is_bda_in_the_srv_chg_clt_list(bd_addr);
  if (p_buf != NULL) {
    if (gatt_cb.cb_info.p_srv_chg_callback) {
      /* delete from NV */
      tGATTS_SRV_CHG_REQ req;
      req.srv_chg.bda = bd_addr;
      (*gatt_cb.cb_info.p_srv_chg_callback)(GATTS_SRV_CHG_CMD_REMOVE_CLIENT,
                                            &req, NULL);
    }
    osi_free(fixed_queue_try_remove_from_queue(gatt_cb.srv_chg_clt_q, p_buf));
  }
}

/*******************************************************************************
 *
 * Function         gatt_set_srv_chg
 *
 * Description      Set the service changed flag to true
 *
 * Returns        None
 *
 ******************************************************************************/
void gatt_set_srv_chg(void) {
  VLOG(1) << __func__;

  if (fixed_queue_is_empty(gatt_cb.srv_chg_clt_q)) return;

  list_t* list = fixed_queue_get_list(gatt_cb.srv_chg_clt_q);
  for (const list_node_t* node = list_begin(list); node != list_end(list);
       node = list_next(node)) {
    VLOG(1) << "found a srv_chg clt";

    tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)list_node(node);
    if (!p_buf->srv_changed) {
      VLOG(1) << "set srv_changed to true";
      p_buf->srv_changed = true;
      tGATTS_SRV_CHG_REQ req;
      memcpy(&req.srv_chg, p_buf, sizeof(tGATTS_SRV_CHG));
      if (gatt_cb.cb_info.p_srv_chg_callback)
        (*gatt_cb.cb_info.p_srv_chg_callback)(GATTS_SRV_CHG_CMD_UPDATE_CLIENT,
                                              &req, NULL);
    }
  }
}

/** Add a pending indication */
void gatt_add_pending_ind(tGATT_TCB* p_tcb, uint16_t lcid, tGATT_VALUE* p_ind) {
  VLOG(1) << __func__ << "enqueue a pending indication";
  tGATT_EBCB* p_eatt_bcb;

  tGATT_VALUE* p_buf = (tGATT_VALUE*)osi_malloc(sizeof(tGATT_VALUE));
  memcpy(p_buf, p_ind, sizeof(tGATT_VALUE));

  if (p_tcb->is_eatt_supported) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_cid(p_tcb, lcid);
    if (p_eatt_bcb) {
      fixed_queue_enqueue(p_eatt_bcb->pending_ind_q, p_buf);
    }
    else {
      VLOG(1) << __func__ << " EATT BCB Not found";
      return;
    }
  }
  else {
    fixed_queue_enqueue(p_tcb->pending_ind_q, p_buf);
  }
}

/*******************************************************************************
 *
 * Function     gatt_add_srv_chg_clt
 *
 * Description  Add a service chnage client to the service change client queue
 *
 * Returns    Pointer to the service change client buffer; Null no buffer
 *            available
 *
 ******************************************************************************/
tGATTS_SRV_CHG* gatt_add_srv_chg_clt(tGATTS_SRV_CHG* p_srv_chg) {
  tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)osi_malloc(sizeof(tGATTS_SRV_CHG));
  VLOG(1) << __func__ << "enqueue a srv chg client";

  memcpy(p_buf, p_srv_chg, sizeof(tGATTS_SRV_CHG));
  fixed_queue_enqueue(gatt_cb.srv_chg_clt_q, p_buf);

  return p_buf;
}

/**
 * Returns pointer to the handle range buffer starting at handle |handle|,
 * nullptr
 * if no buffer available
 */
tGATT_HDL_LIST_ELEM* gatt_find_hdl_buffer_by_handle(uint16_t handle) {
  for (auto& elem : *gatt_cb.hdl_list_info) {
    if (elem.asgn_range.s_handle == handle) return &elem;
  }

  return nullptr;
}
/*******************************************************************************
 *
 * Description  Find handle range buffer by app ID, service and service instance
 *              ID.
 *
 * Returns    Pointer to the buffer, NULL no buffer available
 *
 ******************************************************************************/
std::list<tGATT_HDL_LIST_ELEM>::iterator gatt_find_hdl_buffer_by_app_id(
    const Uuid& app_uuid128, Uuid* p_svc_uuid, uint16_t start_handle) {
  auto end_it = gatt_cb.hdl_list_info->end();
  auto it = gatt_cb.hdl_list_info->begin();
  for (; it != end_it; it++) {
    if (app_uuid128 == it->asgn_range.app_uuid128 &&
        *p_svc_uuid == it->asgn_range.svc_uuid &&
        (start_handle == it->asgn_range.s_handle)) {
      return it;
    }
  }

  return it;
}

/**
 * free the service attribute database buffers by the owner of the service app
 * ID.
 */
void gatt_free_srvc_db_buffer_app_id(const Uuid& app_id) {
  auto it = gatt_cb.hdl_list_info->begin();
  auto end = gatt_cb.hdl_list_info->end();
  while (it != end) {
    if (app_id == it->asgn_range.app_uuid128) {
      it = gatt_cb.hdl_list_info->erase(it);
    } else {
      it++;
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_find_the_connected_bda
 *
 * Description      This function find the connected bda
 *
 * Returns           true if found
 *
 ******************************************************************************/
bool gatt_find_the_connected_bda(uint8_t start_idx, RawAddress& bda,
                                 uint8_t* p_found_idx,
                                 tBT_TRANSPORT* p_transport) {
  uint8_t i;
  bool found = false;
  VLOG(1) << __func__ << " start_idx=" << +start_idx;

  for (i = start_idx; i < GATT_MAX_PHY_CHANNEL; i++) {
    if (gatt_cb.tcb[i].in_use && gatt_cb.tcb[i].ch_state == GATT_CH_OPEN) {
      bda = gatt_cb.tcb[i].peer_bda;
      *p_found_idx = i;
      *p_transport = gatt_cb.tcb[i].transport;
      found = true;
      VLOG(1) << " bda :" << bda;
      break;
    }
  }
  VLOG(1) << StringPrintf(" found=%d found_idx=%d", found, i);
  return found;
}

/*******************************************************************************
 *
 * Function         gatt_is_srv_chg_ind_pending
 *
 * Description      Check whether a service chnaged is in the indication pending
 *                  queue or waiting for an Ack already
 *
 * Returns         bool
 *
 ******************************************************************************/
bool gatt_is_srv_chg_ind_pending(tGATT_TCB* p_tcb) {
  VLOG(1) << __func__ << " is_eatt_supported:" << p_tcb->is_eatt_supported;
  uint16_t xx = 0;
  tGATT_EBCB* p_eatt_bcb;

  if (p_tcb->is_eatt_supported) {
    for (xx = 0; xx < GATT_MAX_EATT_CHANNELS; xx++) {
      if (gatt_cb.eatt_bcb[xx].in_use && (gatt_cb.eatt_bcb[xx].p_tcb == p_tcb))
         {
        p_eatt_bcb = &gatt_cb.eatt_bcb[xx];

        if (p_eatt_bcb->indicate_handle == gatt_cb.handle_of_h_r) return true;

        if (fixed_queue_is_empty(p_eatt_bcb->pending_ind_q))
          continue;

        list_t* list = fixed_queue_get_list(p_eatt_bcb->pending_ind_q);
        for (const list_node_t* node = list_begin(list); node != list_end(list);
            node = list_next(node)) {
          tGATT_VALUE* p_buf = (tGATT_VALUE*)list_node(node);
          if (p_buf->handle == gatt_cb.handle_of_h_r) {
            return true;
          }
        }
      }
    }
  }
  else {
    if (p_tcb->indicate_handle == gatt_cb.handle_of_h_r) return true;

    if (fixed_queue_is_empty(p_tcb->pending_ind_q)) return false;

    list_t* list = fixed_queue_get_list(p_tcb->pending_ind_q);
    for (const list_node_t* node = list_begin(list); node != list_end(list);
         node = list_next(node)) {
      tGATT_VALUE* p_buf = (tGATT_VALUE*)list_node(node);
      if (p_buf->handle == gatt_cb.handle_of_h_r) {
        return true;
      }
    }
  }

  return false;
}

/*******************************************************************************
 *
 * Function         gatt_is_bda_in_the_srv_chg_clt_list
 *
 * Description      This function check the specified bda is in the srv chg
 *                  client list or not
 *
 * Returns         pointer to the found elemenet otherwise NULL
 *
 ******************************************************************************/
tGATTS_SRV_CHG* gatt_is_bda_in_the_srv_chg_clt_list(const RawAddress& bda) {

  VLOG(1) << __func__ << ": " << bda;

  if (fixed_queue_is_empty(gatt_cb.srv_chg_clt_q)) return NULL;

  list_t* list = fixed_queue_get_list(gatt_cb.srv_chg_clt_q);
  for (const list_node_t* node = list_begin(list); node != list_end(list);
       node = list_next(node)) {
    tGATTS_SRV_CHG* p_buf = (tGATTS_SRV_CHG*)list_node(node);
    if (bda == p_buf->bda) {
      VLOG(1) << "bda is in the srv chg clt list";
      return p_buf;
    }
  }

  return NULL;
}

/*******************************************************************************
 *
 * Function         gatt_is_bda_connected
 *
 * Description
 *
 * Returns          GATT_INDEX_INVALID if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
bool gatt_is_bda_connected(const RawAddress& bda) {
  uint8_t i = 0;
  bool connected = false;

  for (i = 0; i < GATT_MAX_PHY_CHANNEL; i++) {
    if (gatt_cb.tcb[i].in_use && gatt_cb.tcb[i].peer_bda == bda) {
      connected = true;
      break;
    }
  }
  return connected;
}

/*******************************************************************************
 *
 * Function         gatt_find_i_tcb_by_addr
 *
 * Description      Search for an empty tcb entry, and return the index.
 *
 * Returns          GATT_INDEX_INVALID if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
uint8_t gatt_find_i_tcb_by_addr(const RawAddress& bda,
                                tBT_TRANSPORT transport) {
  uint8_t i = 0;

  for (; i < GATT_MAX_PHY_CHANNEL; i++) {
    if (gatt_cb.tcb[i].peer_bda == bda &&
        gatt_cb.tcb[i].transport == transport) {
      return i;
    }
  }
  return GATT_INDEX_INVALID;
}

/*******************************************************************************
 *
 * Function         gatt_get_tcb_by_idx
 *
 * Description      The function get TCB using the TCB index
 *
 * Returns           NULL if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_get_tcb_by_idx(uint8_t tcb_idx) {
  tGATT_TCB* p_tcb = NULL;

  if ((tcb_idx < GATT_MAX_PHY_CHANNEL) && gatt_cb.tcb[tcb_idx].in_use)
    p_tcb = &gatt_cb.tcb[tcb_idx];

  return p_tcb;
}

/*******************************************************************************
 *
 * Function         gatt_find_tcb_by_addr
 *
 * Description      Search for an empty tcb entry, and return pointer.
 *
 * Returns          NULL if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_find_tcb_by_addr(const RawAddress& bda,
                                 tBT_TRANSPORT transport) {
  tGATT_TCB* p_tcb = NULL;
  uint8_t i = 0;

  i = gatt_find_i_tcb_by_addr(bda, transport);
  if (i != GATT_INDEX_INVALID) p_tcb = &gatt_cb.tcb[i];

  return p_tcb;
}

/*******************************************************************************
 *
 * Function         gatt_allocate_tcb_by_bdaddr
 *
 * Description      Locate or allocate a new tcb entry for matching bda.
 *
 * Returns          GATT_INDEX_INVALID if not found. Otherwise index to the tcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_allocate_tcb_by_bdaddr(const RawAddress& bda,
                                       tBT_TRANSPORT transport) {
  /* search for existing tcb with matching bda    */
  uint8_t j = gatt_find_i_tcb_by_addr(bda, transport);
  if (j != GATT_INDEX_INVALID) return &gatt_cb.tcb[j];

  /* find free tcb */
  for (int i = 0; i < GATT_MAX_PHY_CHANNEL; i++) {
    tGATT_TCB* p_tcb = &gatt_cb.tcb[i];
    if (p_tcb->in_use) continue;

    *p_tcb = tGATT_TCB();

    p_tcb->pending_ind_q = fixed_queue_new(SIZE_MAX);
    p_tcb->conf_timer = alarm_new("gatt.conf_timer");
    p_tcb->ind_ack_timer = alarm_new("gatt.ind_ack_timer");
    p_tcb->in_use = true;
    p_tcb->tcb_idx = i;
    p_tcb->transport = transport;
    p_tcb->peer_bda = bda;
    if (stack_config_get_interface()->get_pts_configure_svc_chg_indication())
      p_tcb->svc_chg_cccd = btif_storage_get_svc_chg_cccd(bda);
    gatt_sr_init_cl_status(*p_tcb);
    p_tcb->is_db_out_of_sync_sent = false;
    return p_tcb;
  }

  return NULL;
}

/** gatt_build_uuid_to_stream will convert 32bit UUIDs to 128bit. This function
 * will return lenght required to build uuid, either |UUID:kNumBytes16| or
 * |UUID::kNumBytes128| */
uint8_t gatt_build_uuid_to_stream_len(const Uuid& uuid) {
  size_t len = uuid.GetShortestRepresentationSize();
  return len == Uuid::kNumBytes32 ? Uuid::kNumBytes128 : len;
}

/** Add UUID into stream. Returns UUID length. */
uint8_t gatt_build_uuid_to_stream(uint8_t** p_dst, const Uuid& uuid) {
  uint8_t* p = *p_dst;
  size_t len = uuid.GetShortestRepresentationSize();

  if (uuid.IsEmpty()) {
    return 0;
  }

  if (len == Uuid::kNumBytes16) {
    UINT16_TO_STREAM(p, uuid.As16Bit());
  } else if (len == Uuid::kNumBytes32) {
    /* always convert 32 bits into 128 bits */
    ARRAY_TO_STREAM(p, uuid.To128BitLE(), (int)Uuid::kNumBytes128);
    len = Uuid::kNumBytes128;
  } else if (len == Uuid::kNumBytes128) {
    ARRAY_TO_STREAM(p, uuid.To128BitLE(), (int)Uuid::kNumBytes128);
  }

  *p_dst = p;
  return len;
}

bool gatt_parse_uuid_from_cmd(Uuid* p_uuid_rec, uint16_t uuid_size,
                              uint8_t** p_data) {
  bool ret = true;
  uint8_t* p_uuid = *p_data;

  switch (uuid_size) {
    case Uuid::kNumBytes16: {
      uint16_t val;
      STREAM_TO_UINT16(val, p_uuid);
      *p_uuid_rec = Uuid::From16Bit(val);
      *p_data += Uuid::kNumBytes16;
      return true;
    }

    case Uuid::kNumBytes128: {
      *p_uuid_rec = Uuid::From128BitLE(p_uuid);
      *p_data += Uuid::kNumBytes128;
      return true;
    }

    /* do not allow 32 bits UUID in ATT PDU now */
    case Uuid::kNumBytes32:
      LOG(ERROR) << "DO NOT ALLOW 32 BITS UUID IN ATT PDU";
      return false;
    case 0:
    default:
      if (uuid_size != 0) ret = false;
      LOG(WARNING) << __func__ << ": invalid uuid size";
      break;
  }

  return (ret);
}

/*******************************************************************************
 *
 * Function         gatt_start_rsp_timer
 *
 * Description      Start a wait_for_response timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_rsp_timer(tGATT_CLCB* p_clcb) {
  period_ms_t timeout_ms = GATT_WAIT_FOR_RSP_TIMEOUT_MS;

  if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY &&
      p_clcb->op_subtype == GATT_DISC_SRVC_ALL) {
    timeout_ms = GATT_WAIT_FOR_DISC_RSP_TIMEOUT_MS;
  }

  // TODO: The tGATT_CLCB memory and state management needs cleanup,
  // and then the timers can be allocated elsewhere.
  if (p_clcb->gatt_rsp_timer_ent == NULL) {
    p_clcb->gatt_rsp_timer_ent = alarm_new("gatt.gatt_rsp_timer_ent");
  }
  alarm_set_on_mloop(p_clcb->gatt_rsp_timer_ent, timeout_ms, gatt_rsp_timeout,
                     p_clcb);
}

/*******************************************************************************
 *
 * Function         gatt_start_conf_timer
 *
 * Description      Start a wait_for_confirmation timer.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_conf_timer(tGATT_TCB* p_tcb, uint16_t lcid) {
  if (p_tcb->is_eatt_supported) {
    tGATT_EBCB* p_eatt_bcb = gatt_find_eatt_bcb_by_cid(p_tcb, lcid);
    if (p_eatt_bcb) {
      alarm_set_on_mloop(p_eatt_bcb->conf_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                         gatt_indication_confirmation_eatt_timeout, p_eatt_bcb);
    }
    else {
      VLOG(1) << __func__ << "Unknown EATT lcid";
      return;
    }
  }
  else {
    alarm_set_on_mloop(p_tcb->conf_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                     gatt_indication_confirmation_timeout, p_tcb);
  }
}

/*******************************************************************************
 *
 * Function         gatt_start_ind_ack_timer
 *
 * Description      start the application ack timer
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_start_ind_ack_timer(tGATT_TCB& tcb, uint16_t lcid) {
  tGATT_EBCB* p_eatt_bcb;

  if (tcb.is_eatt_supported) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_cid(&tcb, lcid);
    if (p_eatt_bcb) {
      /* start notification cache timer */
      alarm_set_on_mloop(tcb.ind_ack_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                         gatt_ind_ack_eatt_timeout, p_eatt_bcb);
    }
  }
  else {
    /* start notification cache timer */
    alarm_set_on_mloop(tcb.ind_ack_timer, GATT_WAIT_FOR_RSP_TIMEOUT_MS,
                       gatt_ind_ack_timeout, &tcb);
  }

}

static tGATT_PROFILE_CLCB* gatt_find_profile_clcb_by_conn_id(uint16_t conn_id) {
  uint8_t i_clcb;
  tGATT_PROFILE_CLCB* p_clcb = NULL;

  for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS;
       i_clcb++, p_clcb++) {
    if (p_clcb->in_use && p_clcb->conn_id == conn_id) return p_clcb;
  }

  return NULL;
}

/*******************************************************************************
 *
 * Function         gatt_rsp_timeout
 *
 * Description      Called when GATT wait for ATT command response timer expires
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_rsp_timeout(void* data) {
  tGATT_CLCB* p_clcb = (tGATT_CLCB*)data;
  tGATT_EBCB* p_eatt_bcb;
  uint8_t i = 0;

  if (p_clcb == NULL || p_clcb->p_tcb == NULL) {
    LOG(WARNING) << __func__ << " clcb is already deleted";
    return;
  }

  uint16_t lcid = p_clcb->p_tcb->att_lcid;
  tGATT_TCB* p_tcb = p_clcb->p_tcb;

  if (p_clcb->operation == GATTC_OPTYPE_READ &&
      p_clcb->op_subtype == GATT_READ_BY_TYPE &&
      p_clcb->uuid == Uuid::From16Bit(GATT_UUID_GATT_CL_SUPP_FEATURES)) {
    tGATT_PROFILE_CLCB* p_pro_clcb;
    p_pro_clcb = gatt_find_profile_clcb_by_conn_id(p_clcb->conn_id);
    if (p_pro_clcb &&
        p_pro_clcb->in_use && p_pro_clcb->connected &&
        p_pro_clcb->transport == BT_TRANSPORT_LE &&
        p_pro_clcb->robust_caching_stage == GATT_ROBUST_CACHING_CL_SUPP_FEAT_READ) {
      BD_NAME bd_name;
      VLOG(1) << __func__ << ": BTM_GetRemoteDeviceName peer_bda = " << p_pro_clcb->bda;
      if (BTM_GetRemoteDeviceName(p_pro_clcb->bda, bd_name)) {
        VLOG(1) << __func__ << ": interop_database_add_name Name = " << bd_name;
        interop_database_add_name(INTEROP_SKIP_ROBUST_CACHING_READ, (char*) bd_name);
      }
    }
  }

  if (p_clcb->p_tcb->is_eatt_supported) {
    lcid = gatt_get_cid_by_conn_id(p_clcb->conn_id);
  }

  LOG(ERROR) << __func__ << " lcid:" << lcid;

  if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY &&
      p_clcb->op_subtype == GATT_DISC_SRVC_ALL &&
      p_clcb->retry_count < GATT_REQ_RETRY_LIMIT) {
    uint8_t rsp_code;
    LOG(WARNING) << __func__ << " retry discovery primary service";
    if (p_clcb != gatt_cmd_dequeue(*p_clcb->p_tcb, lcid, &rsp_code)) {
      LOG(ERROR) << __func__ << " command queue out of sync, disconnect";
    } else {
      p_clcb->retry_count++;
      gatt_act_discovery(p_clcb);
      return;
    }
  }

  if (p_clcb->p_tcb->is_eatt_supported) {
    gatt_move_apps(p_clcb->p_tcb, lcid);
  }

  LOG(WARNING) << __func__ << " disconnecting...";

  if ((lcid == L2CAP_ATT_CID) && (gatt_num_eatt_bcbs(p_tcb) > 0)) {
    for (i = 0; i < GATT_MAX_EATT_CHANNELS; i++) {
      if (gatt_cb.eatt_bcb[i].in_use && (gatt_cb.eatt_bcb[i].p_tcb->peer_bda == p_tcb->peer_bda)
          && (!gatt_cb.eatt_bcb[i].create_in_prg) && (gatt_cb.eatt_bcb[i].cid != L2CAP_ATT_CID)) {
        p_eatt_bcb = &gatt_cb.eatt_bcb[i];
        p_tcb->is_att_rsp_tout = true;
        L2CA_DisconnectReq(p_eatt_bcb->cid);
        break;
      }
    }
  }
  else
    gatt_disconnect(p_tcb, lcid);
}

extern void gatts_proc_srv_chg_ind_ack(tGATT_TCB tcb);

/*******************************************************************************
 *
 * Function         gatt_indication_confirmation_timeout
 *
 * Description      Called when the indication confirmation timer expires
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_indication_confirmation_timeout(void* data) {
  tGATT_TCB* p_tcb = (tGATT_TCB*)data;

  if (p_tcb->indicate_handle == gatt_cb.handle_of_h_r) {
    /* There are some GATT Server only devices, that don't implement GATT client
     * functionalities, and ignore "Service Changed" indication. Android does
     * not have CCC in "Service Changed" characteristic, and sends it to all
     * bonded devices. This leads to situation where remote can ignore the
     * indication, and trigger 30s timeout, then reconnection in a loop.
     *
     * Since chances of healthy Client device keeping connection for 30 seconds
     * and not responding to "Service Changed" indication are very low, assume
     * we are dealing with Server only device, and don't trigger disconnection.
     *
     * TODO: In future, we should properly expose CCC, and send indication only
     * to devices that register for it.
     */
    LOG(WARNING) << " Service Changed notification timed out in 30 "
                    "seconds, assuming server-only remote, not disconnecting";
    gatts_proc_srv_chg_ind_ack(*p_tcb);
    return;
  }

  LOG(WARNING) << __func__ << " disconnecting...";
  gatt_disconnect(p_tcb, p_tcb->att_lcid);
}

/*******************************************************************************
 *
 * Function         gatt_indication_confirmation_eatt_timeout
 *
 * Description      Called when the indication confirmation timer expires
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_indication_confirmation_eatt_timeout(void* data) {
  tGATT_EBCB* p_eatt_bcb = (tGATT_EBCB*)data;
  tGATT_TCB* p_tcb = NULL;
  uint16_t lcid;

  LOG(ERROR) << __func__;
  if (p_eatt_bcb) {
    p_tcb = p_eatt_bcb->p_tcb;
    lcid = p_eatt_bcb->cid;
  }
  else {
    VLOG(1) << __func__ << " Invalid EATT bearer";
    return;
  }

  if (p_eatt_bcb->indicate_handle == gatt_cb.handle_of_h_r) {
    /* There are some GATT Server only devices, that don't implement GATT client
     * functionalities, and ignore "Service Changed" indication. Android does
     * not have CCC in "Service Changed" characteristic, and sends it to all
     * bonded devices. This leads to situation where remote can ignore the
     * indication, and trigger 30s timeout, then reconnection in a loop.
     *
     * Since chances of healthy Client device keeping connection for 30 seconds
     * and not responding to "Service Changed" indication are very low, assume
     * we are dealing with Server only device, and don't trigger disconnection.
     *
     * TODO: In future, we should properly expose CCC, and send indication only
     * to devices that register for it.
     */
    LOG(WARNING) << " Service Changed notification timed out in 30 "
                    "seconds, assuming server-only remote, not disconnecting";
    gatts_proc_srv_chg_ind_ack(*p_tcb);
    return;
  }

  if (p_tcb->is_eatt_supported) {
    gatt_move_apps(p_tcb, lcid);
  }

  LOG(WARNING) << __func__ << " disconnecting...";
  gatt_disconnect(p_tcb, lcid);
}

/*******************************************************************************
 *
 * Function         gatt_ind_ack_timeout
 *
 * Description      Called when GATT wait for ATT handle confirmation timeout
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_ind_ack_timeout(void* data) {
  tGATT_TCB* p_tcb = (tGATT_TCB*)data;
  CHECK(p_tcb);

  LOG(WARNING) << __func__ << ": send ack now";
  p_tcb->ind_count = 0;
  attp_send_cl_msg(*p_tcb, nullptr, p_tcb->att_lcid, GATT_HANDLE_VALUE_CONF, NULL);
}

/*******************************************************************************
 *
 * Function         gatt_ind_ack_eatt_timeout
 *
 * Description      Called when GATT wait for ATT handle confirmation timeout
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_ind_ack_eatt_timeout(void* data) {
  tGATT_EBCB* p_eatt_bcb = (tGATT_EBCB*)data;
  CHECK(p_eatt_bcb);

  uint16_t lcid = p_eatt_bcb->cid;
  tGATT_TCB* p_tcb = p_eatt_bcb->p_tcb;
  CHECK(p_tcb);

  LOG(WARNING) << __func__ << ": send ack now, lcid: " << +lcid;
  p_tcb->ind_count = 0;
  attp_send_cl_msg(*p_tcb, nullptr, lcid, GATT_HANDLE_VALUE_CONF, NULL);
}

/*******************************************************************************
 *
 * Description      Search for a service that owns a specific handle.
 *
 * Returns          GATT_MAX_SR_PROFILES if not found. Otherwise the index of
 *                  the service.
 *
 ******************************************************************************/
std::list<tGATT_SRV_LIST_ELEM>::iterator gatt_sr_find_i_rcb_by_handle(
    uint16_t handle) {
  auto it = gatt_cb.srv_list_info->begin();

  for (; it != gatt_cb.srv_list_info->end(); it++) {
    if (it->s_hdl <= handle && it->e_hdl >= handle) {
      return it;
    }
  }

  return it;
}

/*******************************************************************************
 *
 * Function         gatt_sr_get_sec_info
 *
 * Description      Get the security flag and key size information for the peer
 *                  device.
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_sr_get_sec_info(const RawAddress& rem_bda, tBT_TRANSPORT transport,
                          uint8_t* p_sec_flag, uint8_t* p_key_size) {
  uint8_t sec_flag = 0;

  BTM_GetSecurityFlagsByTransport(rem_bda, &sec_flag, transport);

  sec_flag &= (GATT_SEC_FLAG_LKEY_UNAUTHED | GATT_SEC_FLAG_LKEY_AUTHED |
               GATT_SEC_FLAG_ENCRYPTED);

  *p_key_size = btm_ble_read_sec_key_size(rem_bda);
  *p_sec_flag = sec_flag;
}
/*******************************************************************************
 *
 * Function         gatt_sr_send_req_callback
 *
 * Description
 *
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_sr_send_req_callback(uint16_t conn_id, uint32_t trans_id,
                               tGATTS_REQ_TYPE type, tGATTS_DATA* p_data) {
  tGATT_IF gatt_if = GATT_GET_GATT_IF(conn_id);
  tGATT_REG* p_reg = gatt_get_regcb(gatt_if);
  VLOG(1) << __func__;

  if (!p_reg) {
    LOG(ERROR) << "p_reg not found discard request";
    return;
  }

  if (p_reg->in_use && p_reg->app_cb.p_req_cb) {
    (*p_reg->app_cb.p_req_cb)(conn_id, trans_id, type, p_data);
  } else {
    LOG(WARNING) << "Call back not found for application conn_id=" << conn_id;
  }
}

/*******************************************************************************
 *
 * Function         gatt_send_error_rsp
 *
 * Description      This function sends an error response.
 *
 * Returns          void
 *
 ******************************************************************************/
tGATT_STATUS gatt_send_error_rsp(tGATT_TCB& tcb, uint16_t lcid, uint8_t err_code,
                                 uint8_t op_code, uint16_t handle, bool deq) {
  tGATT_STATUS status;
  BT_HDR* p_buf;

  tGATT_SR_MSG msg;
  msg.error.cmd_code = op_code;
  msg.error.reason = err_code;
  msg.error.handle = handle;

  p_buf = attp_build_sr_msg(tcb, lcid, GATT_RSP_ERROR, &msg);
  if (p_buf != NULL) {
    status = attp_send_sr_msg(tcb, lcid, p_buf);
  } else
    status = GATT_INSUF_RESOURCE;

  if (deq) gatt_dequeue_sr_cmd(tcb, lcid);

  return status;
}

/*******************************************************************************
 *
 * Function         gatt_add_sdp_record
 *
 * Description      This function add a SDP record for a GATT primary service
 *
 * Returns          0 if error else sdp handle for the record.
 *
 ******************************************************************************/
uint32_t gatt_add_sdp_record(const Uuid& uuid, uint16_t start_hdl,
                             uint16_t end_hdl) {
  uint8_t buff[60];
  uint8_t* p = buff;

  VLOG(1) << __func__
          << StringPrintf(" s_hdl=0x%x  s_hdl=0x%x", start_hdl, end_hdl);

  uint32_t sdp_handle = SDP_CreateRecord();
  if (sdp_handle == 0) return 0;

  switch (uuid.GetShortestRepresentationSize()) {
    case Uuid::kNumBytes16: {
      uint16_t tmp = uuid.As16Bit();
      SDP_AddServiceClassIdList(sdp_handle, 1, &tmp);
      break;
    }

    case Uuid::kNumBytes32: {
      UINT8_TO_BE_STREAM(p, (UUID_DESC_TYPE << 3) | SIZE_FOUR_BYTES);
      uint32_t tmp = uuid.As32Bit();
      UINT32_TO_BE_STREAM(p, tmp);
      SDP_AddAttribute(sdp_handle, ATTR_ID_SERVICE_CLASS_ID_LIST,
                       DATA_ELE_SEQ_DESC_TYPE, (uint32_t)(p - buff), buff);
      break;
    }

    case Uuid::kNumBytes128:
      UINT8_TO_BE_STREAM(p, (UUID_DESC_TYPE << 3) | SIZE_SIXTEEN_BYTES);
      ARRAY_TO_BE_STREAM(p, uuid.To128BitBE().data(), (int)Uuid::kNumBytes128);
      SDP_AddAttribute(sdp_handle, ATTR_ID_SERVICE_CLASS_ID_LIST,
                       DATA_ELE_SEQ_DESC_TYPE, (uint32_t)(p - buff), buff);
      break;
  }

  /*** Fill out the protocol element sequence for SDP ***/
  tSDP_PROTOCOL_ELEM proto_elem_list[2];
  proto_elem_list[0].protocol_uuid = UUID_PROTOCOL_L2CAP;
  proto_elem_list[0].num_params = 1;
  proto_elem_list[0].params[0] = BT_PSM_ATT;
  proto_elem_list[1].protocol_uuid = UUID_PROTOCOL_ATT;
  proto_elem_list[1].num_params = 2;
  proto_elem_list[1].params[0] = start_hdl;
  proto_elem_list[1].params[1] = end_hdl;

  SDP_AddProtocolList(sdp_handle, 2, proto_elem_list);

  /* Make the service browseable */
  uint16_t list = UUID_SERVCLASS_PUBLIC_BROWSE_GROUP;
  SDP_AddUuidSequence(sdp_handle, ATTR_ID_BROWSE_GROUP_LIST, 1, &list);

  return (sdp_handle);
}

#if GATT_CONFORMANCE_TESTING == TRUE
/*******************************************************************************
 *
 * Function         gatt_set_err_rsp
 *
 * Description      This function is called to set the test confirm value
 *
 * Returns          void
 *
 ******************************************************************************/
void gatt_set_err_rsp(bool enable, uint8_t req_op_code, uint8_t err_status) {
  VLOG(1) << __func__
          << StringPrintf(" enable=%d op_code=%d, err_status=%d", enable,
                          req_op_code, err_status);
  gatt_cb.enable_err_rsp = enable;
  gatt_cb.req_op_code = req_op_code;
  gatt_cb.err_status = err_status;
}
#endif

/*******************************************************************************
 *
 * Function         gatt_get_regcb
 *
 * Description      The function returns the registration control block.
 *
 * Returns          pointer to the registration control block or NULL
 *
 ******************************************************************************/
tGATT_REG* gatt_get_regcb(tGATT_IF gatt_if) {
  uint8_t ii = (uint8_t)gatt_if;
  tGATT_REG* p_reg = NULL;

  if (ii < 1 || ii > GATT_MAX_APPS) {
    LOG(WARNING) << "gatt_if out of range = " << +ii;
    return NULL;
  }

  // Index for cl_rcb is always 1 less than gatt_if.
  p_reg = &gatt_cb.cl_rcb[ii - 1];

  if (!p_reg->in_use) {
    LOG(WARNING) << "gatt_if found but not in use.";
    return NULL;
  }

  return p_reg;
}

/*******************************************************************************
 *
 * Function         gatt_is_clcb_allocated
 *
 * Description      The function check clcb for conn_id is allocated or not
 *
 * Returns           True already allocated
 *
 ******************************************************************************/

bool gatt_is_clcb_allocated(uint16_t conn_id) {
  uint8_t i = 0;
  bool is_allocated = false;

  for (i = 0; i < GATT_CL_MAX_LCB; i++) {
    if (gatt_cb.clcb[i].in_use && (gatt_cb.clcb[i].conn_id == conn_id)) {
      is_allocated = true;
      break;
    }
  }

  return is_allocated;
}

/*******************************************************************************
 *
 * Function         gatt_clcb_alloc
 *
 * Description      The function allocates a GATT  connection link control block
 *
 * Returns          NULL if not found. Otherwise pointer to the connection link
 *                  block.
 *
 ******************************************************************************/
tGATT_CLCB* gatt_clcb_alloc(uint16_t conn_id) {
  uint8_t i = 0;
  tGATT_CLCB* p_clcb = NULL;
  tGATT_IF gatt_if = GATT_GET_GATT_IF(conn_id);
  uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id);
  tGATT_TCB* p_tcb = gatt_get_tcb_by_idx(tcb_idx);
  tGATT_REG* p_reg = gatt_get_regcb(gatt_if);

  for (i = 0; i < GATT_CL_MAX_LCB; i++) {
    if (!gatt_cb.clcb[i].in_use) {
      p_clcb = &gatt_cb.clcb[i];

      p_clcb->in_use = true;
      p_clcb->conn_id = conn_id;
      p_clcb->p_reg = p_reg;
      p_clcb->p_tcb = p_tcb;
      break;
    }
  }

  return p_clcb;
}

/*******************************************************************************
 *
 * Function         gatt_clcb_dealloc
 *
 * Description      The function de-allocates a GATT connection link control
 *                  block
 *
 * Returns         None
 *
 ******************************************************************************/
void gatt_clcb_dealloc(tGATT_CLCB* p_clcb) {
  if (p_clcb && p_clcb->in_use) {
    alarm_free(p_clcb->gatt_rsp_timer_ent);
    memset(p_clcb, 0, sizeof(tGATT_CLCB));
  }
}

/*******************************************************************************
 *
 * Function         gatt_find_tcb_by_cid
 *
 * Description      The function searches for an empty entry
 *                   in registration info table for GATT client
 *
 * Returns           NULL if not found. Otherwise pointer to the rcb.
 *
 ******************************************************************************/
tGATT_TCB* gatt_find_tcb_by_cid(uint16_t lcid) {
  uint16_t xx = 0;
  tGATT_TCB* p_tcb = NULL;

  for (xx = 0; xx < GATT_MAX_PHY_CHANNEL; xx++) {
    if (gatt_cb.tcb[xx].in_use && gatt_cb.tcb[xx].att_lcid == lcid) {
      p_tcb = &gatt_cb.tcb[xx];
      break;
    }
  }
  return p_tcb;
}

/*******************************************************************************
 *
 * Function         gatt_num_clcb_by_bd_addr
 *
 * Description      The function searches all LCB with macthing bd address
 *
 * Returns          total number of clcb found.
 *
 ******************************************************************************/
uint8_t gatt_num_clcb_by_bd_addr(const RawAddress& bda) {
  uint8_t i, num = 0;

  for (i = 0; i < GATT_CL_MAX_LCB; i++) {
    if (gatt_cb.clcb[i].in_use && gatt_cb.clcb[i].p_tcb->peer_bda == bda) num++;
  }
  return num;
}

void gatt_sr_copy_prep_cnt_to_cback_cnt(tGATT_TCB& tcb) {
  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    if (tcb.prep_cnt[i]) {
      tcb.sr_cmd.cback_cnt[i] = 1;
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_is_cback_cnt_zero
 *
 * Description      The function searches all LCB with macthing bd address
 *
 * Returns          True if thetotal application callback count is zero
 *
 ******************************************************************************/
bool gatt_sr_is_cback_cnt_zero(tGATT_TCB& tcb, uint16_t lcid) {
  tGATT_EBCB* p_eatt_bcb;

  if (tcb.is_eatt_supported) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_cid(&tcb, lcid);
    if (p_eatt_bcb == NULL) {
      VLOG(1) << __func__ << " EATT bearer not found for : " << +lcid;
      return false;
    }
  }

  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    if (tcb.is_eatt_supported) {
      if (p_eatt_bcb->sr_cmd.cback_cnt[i]) {
        return false;
      }
    }
    else {
      if (tcb.sr_cmd.cback_cnt[i]) {
        return false;
      }
    }
  }
  return true;
}

/*******************************************************************************
 *
 * Function         gatt_sr_is_prep_cnt_zero
 *
 * Description      Check the prepare write request count is zero or not
 *
 * Returns          True no prepare write request
 *
 ******************************************************************************/
bool gatt_sr_is_prep_cnt_zero(tGATT_TCB& tcb) {
  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    if (tcb.prep_cnt[i]) {
      return false;
    }
  }
  return true;
}

/*******************************************************************************
 *
 * Function         gatt_sr_reset_cback_cnt
 *
 * Description      Reset the application callback count to zero
 *
 * Returns         None
 *
 ******************************************************************************/
void gatt_sr_reset_cback_cnt(tGATT_TCB& tcb) {
  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    tcb.sr_cmd.cback_cnt[i] = 0;
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_reset_prep_cnt
 *
 * Description     Reset the prep write count to zero
 *
 * Returns        None
 *
 ******************************************************************************/
void gatt_sr_reset_prep_cnt(tGATT_TCB& tcb) {
  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    tcb.prep_cnt[i] = 0;
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_update_cback_cnt
 *
 * Description    Update the teh applicaiton callback count
 *
 * Returns           None
 *
 ******************************************************************************/
void gatt_sr_update_cback_cnt(tGATT_TCB& tcb, tGATT_IF gatt_if, bool is_inc,
                              bool is_reset_first) {
  uint8_t idx = ((uint8_t)gatt_if) - 1;

  if (is_reset_first) {
    gatt_sr_reset_cback_cnt(tcb);
  }
  if (is_inc) {
    tcb.sr_cmd.cback_cnt[idx]++;
  } else {
    if (tcb.sr_cmd.cback_cnt[idx]) {
      tcb.sr_cmd.cback_cnt[idx]--;
    }
  }
}

/*******************************************************************************
 *
 * Function         gatt_sr_update_prep_cnt
 *
 * Description    Update the teh prepare write request count
 *
 * Returns           None
 *
 ******************************************************************************/
void gatt_sr_update_prep_cnt(tGATT_TCB& tcb, tGATT_IF gatt_if, bool is_inc,
                             bool is_reset_first) {
  uint8_t idx = ((uint8_t)gatt_if) - 1;

  VLOG(1) << StringPrintf(
      "%s tcb idx=%d gatt_if=%d is_inc=%d is_reset_first=%d", __func__,
      tcb.tcb_idx, gatt_if, is_inc, is_reset_first);

  if (is_reset_first) {
    gatt_sr_reset_prep_cnt(tcb);
  }
  if (is_inc) {
    tcb.prep_cnt[idx]++;
  } else {
    if (tcb.prep_cnt[idx]) {
      tcb.prep_cnt[idx]--;
    }
  }
}

/** Cancel LE Create Connection request */
bool gatt_cancel_open(tGATT_IF gatt_if, const RawAddress& bda) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, BT_TRANSPORT_LE);
  tGATT_EBCB* p_eatt_bcb;
  uint16_t lcid;

  if (!p_tcb) return true;

  lcid = p_tcb->att_lcid;

  if(p_tcb->is_eatt_supported) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_gatt_if(gatt_if, bda);
    if (p_eatt_bcb)
      lcid = p_eatt_bcb->cid;
  }

  if (gatt_get_ch_state(p_tcb) == GATT_CH_OPEN) {
    LOG(ERROR) << __func__ << ": link connected Too late to cancel";
    return false;
  }

  gatt_update_app_use_link_flag(gatt_if, p_tcb, false, false);

  if (p_tcb->app_hold_link.empty()) gatt_disconnect(p_tcb, lcid);

  connection_manager::direct_connect_remove(gatt_if, bda);
  return true;
}

/** Enqueue this command */
void gatt_cmd_enq(tGATT_TCB& tcb, tGATT_CLCB* p_clcb, tGATT_EBCB* p_eatt_bcb,
                  bool to_send, uint8_t op_code, BT_HDR* p_buf) {
  tGATT_CMD_Q cmd;
  cmd.to_send = to_send; /* waiting to be sent */
  cmd.op_code = op_code;
  cmd.p_cmd = p_buf;
  cmd.p_clcb = p_clcb;

  if (!to_send) {
    // TODO: WTF why do we clear the queue here ?!
    if (tcb.is_eatt_supported) {
      p_eatt_bcb->cl_cmd_q = std::queue<tGATT_CMD_Q>();
    }
    else {
      tcb.cl_cmd_q = std::queue<tGATT_CMD_Q>();
    }
  }

  if (tcb.is_eatt_supported) {
    p_eatt_bcb->cl_cmd_q.push(cmd);
  }
  else {
    tcb.cl_cmd_q.push(cmd);
  }
}

/** dequeue the command in the client CCB command queue */
tGATT_CLCB* gatt_cmd_dequeue(tGATT_TCB& tcb, uint16_t lcid, uint8_t* p_op_code) {
  std::queue<tGATT_CMD_Q>* cl_cmd_q = &tcb.cl_cmd_q;
  tGATT_EBCB* p_eatt_bcb;

  if (tcb.is_eatt_supported) {
    p_eatt_bcb = gatt_find_eatt_bcb_by_cid(&tcb, lcid);
    if (p_eatt_bcb) {
      cl_cmd_q = &(p_eatt_bcb->cl_cmd_q);
    }
    else {
      if (lcid != L2CAP_ATT_CID) {
        VLOG(1) << __func__ << "EATT supported: Unknown lcid";
        return NULL;
      }
    }
  }

  if (cl_cmd_q->empty()) return nullptr;

  tGATT_CMD_Q cmd = cl_cmd_q->front();
  tGATT_CLCB* p_clcb = cmd.p_clcb;
  *p_op_code = cmd.op_code;
  cl_cmd_q->pop();

  return p_clcb;
}

/** Send out the ATT message for write */
uint8_t gatt_send_write_msg(tGATT_TCB& tcb, tGATT_CLCB* p_clcb, uint8_t op_code,
                            uint16_t handle, uint16_t len, uint16_t offset,
                            uint8_t* p_data) {
  tGATT_CL_MSG msg;
  uint16_t lcid = 0;

  msg.attr_value.handle = handle;
  msg.attr_value.len = len;
  msg.attr_value.offset = offset;
  memcpy(msg.attr_value.value, p_data, len);

  lcid = tcb.att_lcid;
  if (tcb.is_eatt_supported) {
    lcid = gatt_get_cid_by_conn_id(p_clcb->conn_id);
  }

  /* write by handle */
  return attp_send_cl_msg(tcb, p_clcb, lcid, op_code, &msg);
}

/*******************************************************************************
 *
 * Function         gatt_end_operation
 *
 * Description      This function ends a discovery, send callback and finalize
 *                  some control value.
 *
 * Returns          16 bits uuid.
 *
 ******************************************************************************/
void gatt_end_operation(tGATT_CLCB* p_clcb, tGATT_STATUS status, void* p_data) {
  tGATT_CL_COMPLETE cb_data;
  tGATT_CMPL_CBACK* p_cmpl_cb =
      (p_clcb->p_reg) ? p_clcb->p_reg->app_cb.p_cmpl_cb : NULL;
  uint8_t op = p_clcb->operation, disc_type = GATT_DISC_MAX;
  tGATT_DISC_CMPL_CB* p_disc_cmpl_cb =
      (p_clcb->p_reg) ? p_clcb->p_reg->app_cb.p_disc_cmpl_cb : NULL;
  uint16_t conn_id;
  uint8_t operation;

  VLOG(1) << __func__
          << StringPrintf(" status=%d op=%d subtype=%d", status,
                          p_clcb->operation, p_clcb->op_subtype);
  memset(&cb_data.att_value, 0, sizeof(tGATT_VALUE));

  if (p_cmpl_cb != NULL && p_clcb->operation != 0) {
    if (p_clcb->operation == GATTC_OPTYPE_READ) {
      //Add for read multi rsp
      if ((p_clcb->op_subtype == GATT_READ_MULTIPLE ||
          p_clcb->op_subtype == GATT_READ_MULTIPLE_VARIABLE)) {
        if (status == GATT_NOT_FOUND) {
          cb_data.att_value.handle = p_clcb->err_handle;
        }
        cb_data.att_value.read_sub_type = p_clcb->op_subtype;
      } else {
        cb_data.att_value.handle = p_clcb->s_handle;
      }

      cb_data.att_value.len = p_clcb->counter;

      if (p_data && p_clcb->counter)
        memcpy(cb_data.att_value.value, p_data, cb_data.att_value.len);
    }

    if (p_clcb->operation == GATTC_OPTYPE_WRITE) {
      memset(&cb_data.att_value, 0, sizeof(tGATT_VALUE));
      cb_data.handle = cb_data.att_value.handle = p_clcb->s_handle;
      if (p_clcb->op_subtype == GATT_WRITE_PREPARE) {
        if (p_data) {
          cb_data.att_value = *((tGATT_VALUE*)p_data);
        } else {
          VLOG(1) << "Rcv Prepare write rsp but no data";
        }
      }
    }

    if (p_clcb->operation == GATTC_OPTYPE_CONFIG)
      cb_data.mtu = p_clcb->p_tcb->payload_size;

    if (p_clcb->operation == GATTC_OPTYPE_DISCOVERY) {
      disc_type = p_clcb->op_subtype;
    }
  }

  osi_free_and_reset((void**)&p_clcb->p_attr_buf);

  operation = p_clcb->operation;
  conn_id = p_clcb->conn_id;
  alarm_cancel(p_clcb->gatt_rsp_timer_ent);

  gatt_clcb_dealloc(p_clcb);

  if (p_disc_cmpl_cb && (op == GATTC_OPTYPE_DISCOVERY))
    (*p_disc_cmpl_cb)(conn_id, disc_type, status);
  else if (p_cmpl_cb && op)
    (*p_cmpl_cb)(conn_id, op, status, &cb_data, 0);
  else
    LOG(WARNING) << __func__
                 << StringPrintf(
                        ": not sent out op=%d p_disc_cmpl_cb:%p p_cmpl_cb:%p",
                        operation, p_disc_cmpl_cb, p_cmpl_cb);
}

/** This function cleans up the control blocks when L2CAP channel disconnect */
void gatt_cleanup_upon_disc(const RawAddress& bda, uint16_t reason,
                            tBT_TRANSPORT transport) {
  VLOG(1) << __func__;

  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bda, transport);

  if (!p_tcb) return;

  uint16_t lcid = p_tcb->att_lcid;
  gatt_set_ch_state(p_tcb, GATT_CH_CLOSE);
  for (uint8_t i = 0; i < GATT_CL_MAX_LCB; i++) {
    tGATT_CLCB* p_clcb = &gatt_cb.clcb[i];
    if (!p_clcb->in_use || p_clcb->p_tcb != p_tcb) continue;

    alarm_cancel(p_clcb->gatt_rsp_timer_ent);
    VLOG(1) << "found p_clcb conn_id=" << +p_clcb->conn_id;
    if (p_clcb->operation == GATTC_OPTYPE_NONE) {
      gatt_clcb_dealloc(p_clcb);
      continue;
    }

    gatt_end_operation(p_clcb, GATT_ERROR, NULL);
  }

  alarm_cancel(p_tcb->ind_ack_timer);
  alarm_free(p_tcb->ind_ack_timer);
  p_tcb->ind_ack_timer = NULL;

  alarm_cancel(p_tcb->conf_timer);
  alarm_free(p_tcb->conf_timer);
  p_tcb->conf_timer = NULL;
  fixed_queue_free(p_tcb->sr_cmd.multi_rsp_q, NULL);
  p_tcb->sr_cmd.multi_rsp_q = NULL;

  for (uint8_t i = 0; i < GATT_MAX_APPS; i++) {
    tGATT_REG* p_reg = &gatt_cb.cl_rcb[i];
    if (p_reg->in_use && p_reg->app_cb.p_conn_cb) {
      uint16_t conn_id = GATT_CREATE_CONN_ID(p_tcb->tcb_idx, p_reg->gatt_if);
      VLOG(1) << StringPrintf("found p_reg tcb_idx=%d gatt_if=%d  conn_id=0x%x",
                              p_tcb->tcb_idx, p_reg->gatt_if, conn_id);
      (*p_reg->app_cb.p_conn_cb)(p_reg->gatt_if, bda, conn_id, false, reason,
                                 transport);

      if (p_tcb->is_eatt_supported && (transport == BT_TRANSPORT_LE)) {
        lcid = gatt_get_cid_by_conn_id(conn_id);
      }
      if (lcid != L2CAP_ATT_CID)
        gatt_free_pending_ind(p_tcb, lcid);
    }
  }

  if (transport == BT_TRANSPORT_LE) {
    gatt_free_pending_ind(p_tcb, L2CAP_ATT_CID);
    eatt_cleanup_upon_disc(bda);
  }

  p_tcb->is_eatt_supported = false;
  p_tcb->is_eatt_upgrade_done = false;
  p_tcb->is_att_rsp_tout = false;

  *p_tcb = tGATT_TCB();
  VLOG(1) << __func__ << ": exit";
}
/*******************************************************************************
 *
 * Function         gatt_dbg_req_op_name
 *
 * Description      Get op code description name, for debug information.
 *
 * Returns          uint8_t *: name of the operation.
 *
 ******************************************************************************/
uint8_t* gatt_dbg_op_name(uint8_t op_code) {
  uint8_t pseduo_op_code_idx = op_code & (~GATT_WRITE_CMD_MASK);

  if (op_code == GATT_CMD_WRITE) {
    pseduo_op_code_idx = 0x14; /* just an index to op_code_name */
  }

  if (op_code == GATT_SIGN_CMD_WRITE) {
    pseduo_op_code_idx = 0x15; /* just an index to op_code_name */
  }

  if (pseduo_op_code_idx <= GATT_OP_CODE_MAX)
    return (uint8_t*)op_code_name[pseduo_op_code_idx];
  else
    return (uint8_t*)"Op Code Exceed Max";
}

/** Remove the application interface for the specified background device */
bool gatt_auto_connect_dev_remove(tGATT_IF gatt_if, const RawAddress& bd_addr) {
  tGATT_TCB* p_tcb = gatt_find_tcb_by_addr(bd_addr, BT_TRANSPORT_LE);
  if (p_tcb) gatt_update_app_use_link_flag(gatt_if, p_tcb, false, false);
  return connection_manager::background_connect_remove(gatt_if, bd_addr);
}

/*******************************************************************************
 *
 * Function         gatt_is_robust_caching_enabled
 *
 * Description      check if robust caching is enabled
 *
 * Returns          true if enabled; otherwise false
 *
 ******************************************************************************/
bool gatt_is_robust_caching_enabled() {
  char gatt_caching_enabled_prop[PROPERTY_VALUE_MAX] = "false";
  bool is_gatt_robust_caching_enabled = false;
  if (property_get("persist.vendor.btstack.enable.gatt_robust_caching", gatt_caching_enabled_prop, "true")
      && !strcmp(gatt_caching_enabled_prop, "true")) {
    is_gatt_robust_caching_enabled = true;
  }

  VLOG(1) << __func__ << " is_gatt_robust_caching_enabled:" << +is_gatt_robust_caching_enabled;
  return is_gatt_robust_caching_enabled;
}