/******************************************************************************
 *
 *  Copyright (C) 1999-2013 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.
 *
 ******************************************************************************/

#include "bt_target.h"
#include "bt_utils.h"
#include "gatt_api.h"
#include "gatt_int.h"
#include "osi/include/osi.h"
#include "srvc_eng_int.h"

#if (BLE_INCLUDED == TRUE)

#include "srvc_dis_int.h"
#include "srvc_battery_int.h"

static void srvc_eng_s_request_cback (uint16_t conn_id, uint32_t trans_id, uint8_t op_code, tGATTS_DATA *p_data);
static void srvc_eng_connect_cback (UNUSED_ATTR tGATT_IF gatt_if, BD_ADDR bda,
				    uint16_t conn_id, bool    connected,
                                          tGATT_DISCONN_REASON reason, tBT_TRANSPORT transport);
static void srvc_eng_c_cmpl_cback (uint16_t conn_id, tGATTC_OPTYPE op, tGATT_STATUS status, tGATT_CL_COMPLETE *p_data);

static tGATT_CBACK srvc_gatt_cback =
{
    srvc_eng_connect_cback,
    srvc_eng_c_cmpl_cback,
    NULL,
    NULL,
    srvc_eng_s_request_cback,
    NULL,
    NULL
} ;
/* type for action functions */
typedef void (*tSRVC_ENG_C_CMPL_ACTION)(tSRVC_CLCB *p_clcb, tGATTC_OPTYPE op,
                                    tGATT_STATUS status, tGATT_CL_COMPLETE *p_data);

const tSRVC_ENG_C_CMPL_ACTION srvc_eng_c_cmpl_act[SRVC_ID_MAX] =
{
    dis_c_cmpl_cback,
};

tSRVC_ENG_CB srvc_eng_cb;

/*******************************************************************************
**
** Function         srvc_eng_find_conn_id_by_bd_addr
**
** Description      The function searches all LCB with macthing bd address
**
** Returns          total number of clcb found.
**
*******************************************************************************/
uint16_t srvc_eng_find_conn_id_by_bd_addr(BD_ADDR bda)
{
    uint8_t i_clcb;
    tSRVC_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (p_clcb->in_use && p_clcb->connected && !memcmp(p_clcb->bda, bda, BD_ADDR_LEN))
        {
            return p_clcb->conn_id;
        }
    }

    return GATT_INVALID_CONN_ID;
}

/*******************************************************************************
**
** Function         srvc_eng_find_clcb_by_bd_addr
**
** Description      The function searches all LCBs with macthing bd address.
**
** Returns          Pointer to the found link conenction control block.
**
*******************************************************************************/
tSRVC_CLCB *srvc_eng_find_clcb_by_bd_addr(BD_ADDR bda)
{
    uint8_t i_clcb;
    tSRVC_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (p_clcb->in_use && p_clcb->connected && !memcmp(p_clcb->bda, bda, BD_ADDR_LEN))
        {
            return p_clcb;
        }
    }

    return NULL;
}
/*******************************************************************************
**
** Function         srvc_eng_find_clcb_by_conn_id
**
** Description      The function searches all LCBs with macthing connection ID.
**
** Returns          Pointer to the found link conenction control block.
**
*******************************************************************************/
tSRVC_CLCB *srvc_eng_find_clcb_by_conn_id(uint16_t conn_id)
{
    uint8_t i_clcb;
    tSRVC_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (p_clcb->in_use && p_clcb->connected && p_clcb->conn_id == conn_id)
        {
            return p_clcb;
        }
    }

    return NULL;
}
/*******************************************************************************
**
** Function         srvc_eng_find_clcb_by_conn_id
**
** Description      The function searches all LCBs with macthing connection ID.
**
** Returns          Pointer to the found link conenction control block.
**
*******************************************************************************/
uint8_t srvc_eng_find_clcb_idx_by_conn_id(uint16_t conn_id)
{
    uint8_t i_clcb;
    tSRVC_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (p_clcb->in_use && p_clcb->connected && p_clcb->conn_id == conn_id)
        {
            return i_clcb;
        }
    }

    return SRVC_MAX_APPS;
}
/*******************************************************************************
**
** Function         srvc_eng_clcb_alloc
**
** Description      The function allocates a GATT profile  connection link control block
**
** Returns           NULL if not found. Otherwise pointer to the connection link block.
**
*******************************************************************************/
tSRVC_CLCB *srvc_eng_clcb_alloc (uint16_t conn_id, BD_ADDR bda)
{
    uint8_t                 i_clcb = 0;
    tSRVC_CLCB      *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (!p_clcb->in_use)
        {
            p_clcb->in_use      = true;
            p_clcb->conn_id     = conn_id;
            p_clcb->connected   = true;
            memcpy (p_clcb->bda, bda, BD_ADDR_LEN);
            break;
        }
    }
    return p_clcb;
}
/*******************************************************************************
**
** Function         srvc_eng_clcb_dealloc
**
** Description      The function deallocates a GATT profile  connection link control block
**
** Returns           True the deallocation is successful
**
*******************************************************************************/
bool    srvc_eng_clcb_dealloc (uint16_t conn_id)
{
    uint8_t                 i_clcb = 0;
    tSRVC_CLCB      *p_clcb = NULL;

    for (i_clcb = 0, p_clcb= srvc_eng_cb.clcb; i_clcb < SRVC_MAX_APPS; i_clcb++, p_clcb++)
    {
        if (p_clcb->in_use && p_clcb->connected && (p_clcb->conn_id == conn_id))
        {
            unsigned j;
            for (j = 0; j < ARRAY_SIZE(p_clcb->dis_value.data_string); j++)
                osi_free(p_clcb->dis_value.data_string[j]);

            memset(p_clcb, 0, sizeof(tSRVC_CLCB));
            return true;
        }
    }
    return false;
}
/*******************************************************************************
**   Service Engine Server Attributes Database Read/Read Blob Request process
*******************************************************************************/
uint8_t srvc_eng_process_read_req (uint8_t clcb_idx, tGATT_READ_REQ *p_data, tGATTS_RSP *p_rsp, tGATT_STATUS *p_status)
{
    tGATT_STATUS    status = GATT_NOT_FOUND;
    uint8_t     act = SRVC_ACT_RSP;

    if (p_data->is_long)
        p_rsp->attr_value.offset = p_data->offset;

    p_rsp->attr_value.handle = p_data->handle;

    if (dis_valid_handle_range(p_data->handle))
        act = dis_read_attr_value(clcb_idx, p_data->handle, &p_rsp->attr_value, p_data->is_long, p_status);

    else if (battery_valid_handle_range(p_data->handle))
        act = battery_s_read_attr_value(clcb_idx, p_data->handle, &p_rsp->attr_value, p_data->is_long, p_status);

    else
        *p_status = status;
    return act;
}
/*******************************************************************************
**   Service Engine Server Attributes Database write Request process
*******************************************************************************/
uint8_t srvc_eng_process_write_req (uint8_t clcb_idx, tGATT_WRITE_REQ *p_data,
                                    UNUSED_ATTR tGATTS_RSP *p_rsp, tGATT_STATUS *p_status)
{
    uint8_t     act = SRVC_ACT_RSP;

    if (dis_valid_handle_range(p_data->handle))
    {
        act = dis_write_attr_value(p_data, p_status);
    }
    else if (battery_valid_handle_range(p_data->handle))
    {
        act = battery_s_write_attr_value(clcb_idx, p_data, p_status);
    }
    else
        *p_status = GATT_NOT_FOUND;

    return act;
}

/*******************************************************************************
**
** Function         srvc_eng_s_request_cback
**
** Description      GATT DIS attribute access request callback.
**
** Returns          void.
**
*******************************************************************************/
static void srvc_eng_s_request_cback (uint16_t conn_id, uint32_t trans_id, tGATTS_REQ_TYPE type,
                                        tGATTS_DATA *p_data)
{
    uint8_t     status = GATT_INVALID_PDU;
    tGATTS_RSP  rsp_msg ;
    uint8_t     act = SRVC_ACT_IGNORE;
    uint8_t clcb_idx = srvc_eng_find_clcb_idx_by_conn_id(conn_id);

    GATT_TRACE_EVENT("srvc_eng_s_request_cback : recv type (0x%02x)", type);

    memset(&rsp_msg, 0, sizeof(tGATTS_RSP));

    srvc_eng_cb.clcb[clcb_idx].trans_id = trans_id;

    switch (type)
    {
        case GATTS_REQ_TYPE_READ_CHARACTERISTIC:
        case GATTS_REQ_TYPE_READ_DESCRIPTOR:
            act = srvc_eng_process_read_req(clcb_idx, &p_data->read_req, &rsp_msg, &status);
            break;

        case GATTS_REQ_TYPE_WRITE_CHARACTERISTIC:
        case GATTS_REQ_TYPE_WRITE_DESCRIPTOR:
            act = srvc_eng_process_write_req(clcb_idx, &p_data->write_req, &rsp_msg, &status);
            if (!p_data->write_req.need_rsp)
                act = SRVC_ACT_IGNORE;
            break;

        case GATTS_REQ_TYPE_WRITE_EXEC:
            GATT_TRACE_EVENT("Ignore GATT_REQ_EXEC_WRITE/WRITE_CMD" );
            break;

        case GATTS_REQ_TYPE_MTU:
            GATT_TRACE_EVENT("Get MTU exchange new mtu size: %d", p_data->mtu);
            break;

        default:
            GATT_TRACE_EVENT("Unknown/unexpected LE GAP ATT request: 0x%02x", type);
            break;
    }

    srvc_eng_cb.clcb[clcb_idx].trans_id = 0;

    if (act == SRVC_ACT_RSP)
        GATTS_SendRsp (conn_id, trans_id, status, &rsp_msg);


}


/*******************************************************************************
**
** Function         srvc_eng_c_cmpl_cback
**
** Description      Client operation complete callback.
**
** Returns          void
**
*******************************************************************************/
static void srvc_eng_c_cmpl_cback (uint16_t conn_id, tGATTC_OPTYPE op, tGATT_STATUS status,
                                   tGATT_CL_COMPLETE *p_data)
{
    tSRVC_CLCB   *p_clcb = srvc_eng_find_clcb_by_conn_id(conn_id);

    GATT_TRACE_EVENT ("srvc_eng_c_cmpl_cback() - op_code: 0x%02x  status: 0x%02x ", op, status);

    if (p_clcb == NULL)
    {
        GATT_TRACE_ERROR("srvc_eng_c_cmpl_cback received for unknown connection");
        return;
    }

    if (p_clcb->cur_srvc_id != SRVC_ID_NONE &&
        p_clcb->cur_srvc_id <= SRVC_ID_MAX)
        srvc_eng_c_cmpl_act[p_clcb->cur_srvc_id - 1](p_clcb, op, status, p_data);
}


/*******************************************************************************
**
** Function         srvc_eng_connect_cback
**
** Description      Gatt profile connection callback.
**
** Returns          void
**
*******************************************************************************/
static void srvc_eng_connect_cback (UNUSED_ATTR tGATT_IF gatt_if, BD_ADDR bda,
                                    uint16_t conn_id,
                                    bool connected, tGATT_DISCONN_REASON reason,
                                    UNUSED_ATTR tBT_TRANSPORT transport)
{
    GATT_TRACE_EVENT ("srvc_eng_connect_cback: from %08x%04x connected:%d conn_id=%d reason = 0x%04x",
                       (bda[0]<<24)+(bda[1]<<16)+(bda[2]<<8)+bda[3],
                       (bda[4]<<8)+bda[5], connected, conn_id, reason);

    if (connected)
    {
        if (srvc_eng_clcb_alloc(conn_id, bda) == NULL)
        {
            GATT_TRACE_ERROR ("srvc_eng_connect_cback: no_resource");
            return;
        }
    }
    else
    {
        srvc_eng_clcb_dealloc(conn_id);
    }

}
/*******************************************************************************
**
** Function         srvc_eng_c_cmpl_cback
**
** Description      Client operation complete callback.
**
** Returns          void
**
*******************************************************************************/
bool    srvc_eng_request_channel (BD_ADDR remote_bda, uint8_t srvc_id )
{
    bool    set = true;
    tSRVC_CLCB  *p_clcb = srvc_eng_find_clcb_by_bd_addr(remote_bda);

    if (p_clcb == NULL)
        p_clcb = srvc_eng_clcb_alloc(0, remote_bda);

    if (p_clcb && p_clcb->cur_srvc_id == SRVC_ID_NONE)
        p_clcb->cur_srvc_id = srvc_id;
    else
        set = false;

    return set;
}
/*******************************************************************************
**
** Function         srvc_eng_release_channel
**
** Description      Client operation complete callback.
**
** Returns          void
**
*******************************************************************************/
void srvc_eng_release_channel (uint16_t conn_id)
{
    tSRVC_CLCB *p_clcb =  srvc_eng_find_clcb_by_conn_id(conn_id);

    if (p_clcb == NULL)
    {
        GATT_TRACE_ERROR("%s: invalid connection id %d", __func__, conn_id);
        return;
    }

    p_clcb->cur_srvc_id = SRVC_ID_NONE;

    /* check pending request */
    GATT_Disconnect(p_clcb->conn_id);
}
/*******************************************************************************
**
** Function         srvc_eng_init
**
** Description      Initializa the GATT Service engine.
**
*******************************************************************************/
tGATT_STATUS srvc_eng_init (void)
{
    tBT_UUID          app_uuid = {LEN_UUID_16, {UUID_SERVCLASS_DEVICE_INFO}};

    if (srvc_eng_cb.enabled)
    {
        GATT_TRACE_ERROR("DIS already initalized");
    }
    else
    {
        memset(&srvc_eng_cb, 0, sizeof(tSRVC_ENG_CB));

        /* Create a GATT profile service */
        srvc_eng_cb.gatt_if = GATT_Register(&app_uuid, &srvc_gatt_cback);
        GATT_StartIf(srvc_eng_cb.gatt_if);

        GATT_TRACE_DEBUG ("Srvc_Init:  gatt_if=%d  ", srvc_eng_cb.gatt_if);

        srvc_eng_cb.enabled = true;
        dis_cb.dis_read_uuid_idx = 0xff;
    }
    return GATT_SUCCESS;
}

void srvc_sr_rsp(uint8_t clcb_idx, tGATT_STATUS st, tGATTS_RSP *p_rsp)
{
    if (srvc_eng_cb.clcb[clcb_idx].trans_id != 0)
    {
        GATTS_SendRsp(srvc_eng_cb.clcb[clcb_idx].conn_id,
                  srvc_eng_cb.clcb[clcb_idx].trans_id,
                  st,
                  p_rsp);

        srvc_eng_cb.clcb[clcb_idx].trans_id = 0;
    }
}
void srvc_sr_notify(BD_ADDR remote_bda, uint16_t handle, uint16_t len, uint8_t *p_value)
{
    uint16_t conn_id = srvc_eng_find_conn_id_by_bd_addr(remote_bda);

    if (conn_id != GATT_INVALID_CONN_ID)
    {
        GATTS_HandleValueNotification( conn_id, handle, len, p_value);
    }
}

#endif