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/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * 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.
 */

#ifndef __GAP_H__
#define __GAP_H__

#include "mbed.h"
#include "blecommon.h"
#include "GapAdvertisingData.h"
#include "GapAdvertisingParams.h"
#include "GapEvents.h"

/**************************************************************************/
/*!
    \brief
    The base class used to abstract GAP functionality to a specific radio
    transceiver, SOC or BLE Stack.
*/
/**************************************************************************/
class Gap
{
public:
    typedef enum addr_type_e {
        ADDR_TYPE_PUBLIC = 0,
        ADDR_TYPE_RANDOM_STATIC,
        ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE,
        ADDR_TYPE_RANDOM_PRIVATE_NON_RESOLVABLE
    } addr_type_t;

    /**
     * enumeration for disconnection reasons. The values for these reasons are
     * derived from Nordic's implementation; but the reasons are meant to be
     * independent of the transport. If you are returned a reason which is not
     * covered by this enumeration, then please refer to the underlying
     * transport library.
     */
    enum DisconnectionReason_t {
        REMOTE_USER_TERMINATED_CONNECTION = 0x13,
        LOCAL_HOST_TERMINATED_CONNECTION  = 0x16,
        CONN_INTERVAL_UNACCEPTABLE        = 0x3B,
    };

    /* Describes the current state of the device (more than one bit can be set) */
    typedef struct GapState_s {
        unsigned advertising : 1; /**< peripheral is currently advertising */
        unsigned connected   : 1; /**< peripheral is connected to a central */
    } GapState_t;

    typedef uint16_t Handle_t;

    typedef struct {
      uint16_t minConnectionInterval;        /**< Minimum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
      uint16_t maxConnectionInterval;        /**< Maximum Connection Interval in 1.25 ms units, see @ref BLE_GAP_CP_LIMITS.*/
      uint16_t slaveLatency;                 /**< Slave Latency in number of connection events, see @ref BLE_GAP_CP_LIMITS.*/
      uint16_t connectionSupervisionTimeout; /**< Connection Supervision Timeout in 10 ms units, see @ref BLE_GAP_CP_LIMITS.*/
    } ConnectionParams_t;

public:
    /* These functions must be defined in the sub-class */
    virtual ble_error_t setAddress(addr_type_t type, const uint8_t address[6]) = 0;
    virtual ble_error_t setAdvertisingData(const GapAdvertisingData &, const GapAdvertisingData &) = 0;
    virtual ble_error_t startAdvertising(const GapAdvertisingParams &) = 0;
    virtual ble_error_t stopAdvertising(void)                    = 0;
    virtual ble_error_t disconnect(DisconnectionReason_t reason) = 0;
    virtual ble_error_t getPreferredConnectionParams(ConnectionParams_t *params) = 0;
    virtual ble_error_t setPreferredConnectionParams(const ConnectionParams_t *params) = 0;
    virtual ble_error_t updateConnectionParams(Handle_t handle, const ConnectionParams_t *params) = 0;

    virtual ble_error_t setDeviceName(const uint8_t *deviceName) = 0;
    virtual ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP) = 0;
    virtual ble_error_t setAppearance(uint16_t appearance) = 0;
    virtual ble_error_t getAppearance(uint16_t *appearanceP) = 0;

    typedef void (*EventCallback_t)(void);
    typedef void (*ConnectionEventCallback_t)(Handle_t, const ConnectionParams_t *);
    typedef void (*DisconnectionEventCallback_t)(Handle_t, DisconnectionReason_t);

    /* Event callback handlers */
    void setOnTimeout(EventCallback_t callback) {
        onTimeout = callback;
    }
    void setOnConnection(ConnectionEventCallback_t callback) {
        onConnection = callback;
    }
    void setOnDisconnection(DisconnectionEventCallback_t callback) {
        onDisconnection = callback;
    }

    void processConnectionEvent(Handle_t handle, const ConnectionParams_t *params) {
        state.connected = 1;
        if (onConnection) {
            onConnection(handle, params);
        }
    }

    void processDisconnectionEvent(Handle_t handle, DisconnectionReason_t reason) {
        state.connected = 0;
        if (onDisconnection) {
            onDisconnection(handle, reason);
        }
    }

    void processEvent(GapEvents::gapEvent_e type) {
        switch (type) {
            case GapEvents::GAP_EVENT_TIMEOUT:
                state.advertising = 0;
                if (onTimeout) {
                    onTimeout();
                }
                break;
        }
    }

    GapState_t getState(void) const {
        return state;
    }

protected:
    Gap() : state(), onTimeout(NULL), onConnection(NULL), onDisconnection(NULL) {
        /* empty */
    }

protected:
    GapState_t state;

private:
    EventCallback_t              onTimeout;
    ConnectionEventCallback_t    onConnection;
    DisconnectionEventCallback_t onDisconnection;
};

#endif // ifndef __GAP_H__