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/*
 * Copyright (c) 2012, Matias Fontanini
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted 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.
 * 
 * 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
 * OWNER 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.
 *
 */    

#ifndef TINS_DOT11_DOT11_BEACON_H
#define TINS_DOT11_DOT11_BEACON_H

#include "../dot11/dot11_mgmt.h"

namespace Tins {
    /**
     * \brief Class representing an 802.11 Beacon.
     *
     */
    class Dot11Beacon : public Dot11ManagementFrame {
    public:
        /**
         * \brief This PDU's flag.
         */
        static const PDU::PDUType pdu_flag = PDU::DOT11_BEACON;

        /**
         * \brief Constructor for creating a 802.11 Beacon.
         *
         * Constructs a 802.11 Beacon taking destination and source 
         * hardware address.
         *
         * \param dst_hw_addr The destination hardware address.
         * \param src_hw_addr The source hardware address.
         */
        Dot11Beacon(const address_type &dst_hw_addr = address_type(), 
                    const address_type &src_hw_addr = address_type());

        /**
         * \brief Constructs a Dot11Beacon object from a buffer and adds
         * all identifiable PDUs found in the buffer as children of this 
         * one.
         *
         * If the next PDU is not recognized, then a RawPDU is used.
         * 
         * If there is not enough size for the header in the buffer
         * or the input data is malformed, a malformed_packet exception 
         * is thrown.
         * 
         * \param buffer The buffer from which this PDU will be constructed.
         * \param total_sz The total size of the buffer.
         */
        Dot11Beacon(const uint8_t *buffer, uint32_t total_sz);

        /**
         * \brief Getter for the timestamp field.
         *
         * \return The stored timestamp value.
         */
        uint64_t timestamp() const { return Endian::le_to_host(_body.timestamp); }

        /**
         * \brief Getter for the interval field.
         *
         * \return The stored interval value.
         */
        uint16_t interval() const { return Endian::le_to_host(_body.interval); }

        /**
         * \brief Getter for the Capabilities Information structure.
         *
         * \return A constant refereence to the stored Capabilities 
         * Information field.
         */
        const capability_information& capabilities() const { return _body.capability; }

        /**
         * \brief Getter for the Capabilities Information.
         *
         * \return A refereence to the stored Capabilities Information 
         * field.
         */
        capability_information& capabilities() { return _body.capability; }

        /**
         * \brief Setter for the timestamp field.
         *
         * \param new_timestamp The timestamp to be set.
         */
        void timestamp(uint64_t new_timestamp);

        /**
         * \brief Setter for the interval field.
         *
         * \param new_interval The interval to be set.
         */
        void interval(uint16_t new_interval);

        /**
         * \brief Returns the frame's header length.
         *
         * \return An uint32_t with the header's size.
         * \sa PDU::header_size()
         */
        uint32_t header_size() const;

        /**
         * \brief Check wether this PDU matches the specified flag.
         * \param flag The flag to match
         * \sa PDU::matches_flag
         */
        bool matches_flag(PDUType flag) const {
           return flag == pdu_flag || Dot11ManagementFrame::matches_flag(flag);
        }

        /**
         * \brief Clones this PDU.
         *
         * \sa PDU::clone
         */
        Dot11Beacon *clone() const {
            return new Dot11Beacon(*this);
        }

        /**
         * \brief Getter for the PDU's type.
         * \sa PDU::pdu_type
         */
        PDUType pdu_type() const { return pdu_flag; }
    private:
        TINS_BEGIN_PACK
        struct BeaconBody {
            uint64_t timestamp;
            uint16_t interval;
            capability_information capability;
        } TINS_END_PACK;

        uint32_t write_fixed_parameters(uint8_t *buffer, uint32_t total_sz);

        BeaconBody _body;
    };
} // namespace Tins

#endif // TINS_DOT11_DOT11_BEACON_H