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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_ADVERTISING_PARAMS_H__
#define __GAP_ADVERTISING_PARAMS_H__

/**************************************************************************/
/*!
    \brief
    This class provides a wrapper for the core advertising parameters,
    including the advertising type (Connectable Undirected,
    Non Connectable Undirected, etc.), as well as the advertising and
    timeout intervals.

    \par
    See the following for more information on advertising types:

    \li \c Bluetooth Core Specification 4.0 (Vol. 6), Part B, Section 2.3.1
    \li \c Bluetooth Core Specification 4.0 (Vol. 3), Part C, Section 9.3
*/
/**************************************************************************/
class GapAdvertisingParams {
public:
    static const unsigned GAP_ADV_PARAMS_INTERVAL_MIN        = 0x0020;
    static const unsigned GAP_ADV_PARAMS_INTERVAL_MIN_NONCON = 0x00A0;
    static const unsigned GAP_ADV_PARAMS_INTERVAL_MAX        = 0x4000;
    static const unsigned GAP_ADV_PARAMS_TIMEOUT_MAX         = 0x3FFF;

    /*!
     * Encapsulates the peripheral advertising modes, which determine how
     * the device appears to other central devices in hearing range
     */
    enum AdvertisingType_t {
        ADV_CONNECTABLE_UNDIRECTED,     /**< Vol 3, Part C, Section 9.3.4 and Vol 6, Part B, Section 2.3.1.1 */
        ADV_CONNECTABLE_DIRECTED,       /**< Vol 3, Part C, Section 9.3.3 and Vol 6, Part B, Section 2.3.1.2 */
        ADV_SCANNABLE_UNDIRECTED,       /**< Include support for Scan Response payloads, see Vol 6, Part B, Section 2.3.1.4 */
        ADV_NON_CONNECTABLE_UNDIRECTED  /**< Vol 3, Part C, Section 9.3.2 and Vol 6, Part B, Section 2.3.1.3 */
    };
    typedef enum AdvertisingType_t AdvertisingType; /* deprecated type alias. */

public:
    GapAdvertisingParams(AdvertisingType_t advType  = ADV_CONNECTABLE_UNDIRECTED,
                         uint16_t          interval = GAP_ADV_PARAMS_INTERVAL_MIN_NONCON,
                         uint16_t          timeout  = 0) : _advType(advType), _interval(interval), _timeout(timeout) {
        /* Interval checks */
        if (_advType == ADV_CONNECTABLE_DIRECTED) {
            /* Interval must be 0 in directed connectable mode */
            _interval = 0;
        } else if (_advType == ADV_NON_CONNECTABLE_UNDIRECTED) {
            /* Min interval is slightly larger than in other modes */
            if (_interval < GAP_ADV_PARAMS_INTERVAL_MIN_NONCON) {
                _interval = GAP_ADV_PARAMS_INTERVAL_MIN_NONCON;
            }
            if (_interval > GAP_ADV_PARAMS_INTERVAL_MAX) {
                _interval = GAP_ADV_PARAMS_INTERVAL_MAX;
            }
        } else {
            /* Stay within interval limits */
            if (_interval < GAP_ADV_PARAMS_INTERVAL_MIN) {
                _interval = GAP_ADV_PARAMS_INTERVAL_MIN;
            }
            if (_interval > GAP_ADV_PARAMS_INTERVAL_MAX) {
                _interval = GAP_ADV_PARAMS_INTERVAL_MAX;
            }
        }

        /* Timeout checks */
        if (timeout) {
            /* Stay within timeout limits */
            if (_timeout > GAP_ADV_PARAMS_TIMEOUT_MAX) {
                _timeout = GAP_ADV_PARAMS_TIMEOUT_MAX;
            }
        }
    }

    static const uint16_t UNIT_0_625_MS = 625;  /**< Number of microseconds in 0.625 milliseconds. */
    static uint16_t MSEC_TO_ADVERTISEMENT_DURATION_UNITS(uint32_t durationInMillis) {
        return (durationInMillis * 1000) / UNIT_0_625_MS;
    }
    static uint16_t ADVERTISEMENT_DURATION_UNITS_TO_MS(uint16_t gapUnits) {
        return (gapUnits * UNIT_0_625_MS) / 1000;
    }

    AdvertisingType_t getAdvertisingType(void) const {
        return _advType;
    }

    /**
     * @return the advertisement interval (in milliseconds)
     */
    uint16_t getInterval(void) const {
        return ADVERTISEMENT_DURATION_UNITS_TO_MS(_interval);
    }

    /**
     * @return the advertisement interval in units advertisement duration units--i.e. 0.625ms units.
     */
    uint16_t getIntervalInAdvUnits(void) const {
        return _interval;
    }

    uint16_t getTimeout(void) const {
        return _timeout;
    }

    void setAdvertisingType(AdvertisingType_t newAdvType) {_advType = newAdvType;  }
    void setInterval(uint16_t newInterval)                {_interval = MSEC_TO_ADVERTISEMENT_DURATION_UNITS(newInterval);}
    void setTimeout(uint16_t newTimeout)                  {_timeout = newTimeout;  }

private:
    AdvertisingType_t _advType;
    uint16_t          _interval; /* in ADV duration units (i.e. 0.625ms) */
    uint16_t          _timeout;  /* in seconds */
};

#endif // ifndef __GAP_ADVERTISING_PARAMS_H__