/*
 * Copyright (c) 2004 Francisco J. Ros
 * Copyright (c) 2007 INESC Porto
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Authors: Francisco J. Ros  <fjrm@dif.um.es>
 *          Gustavo J. A. M. Carneiro <gjc@inescporto.pt>
 */

#ifndef OLSR_REPOSITORIES_H
#define OLSR_REPOSITORIES_H

#include "ns3/ipv4-address.h"
#include "ns3/nstime.h"

#include <iostream>
#include <set>
#include <vector>

namespace ns3
{
namespace olsr
{

/**
 * @ingroup olsr
 *
 * Willingness for forwarding packets from other nodes.
 * The standard defines the following set of values.
 * Values 0 - 7 are allowed by the standard, but this is not enforced in the code.
 *
 * See \RFC{3626} section 18.8
 */
enum Willingness : uint8_t
{
    NEVER = 0,
    LOW = 1,
    DEFAULT = 3, // medium
    HIGH = 6,
    ALWAYS = 7,
};

/**
 * Stream insertion operator for OLSR willingness.
 *
 * @param os Output stream.
 * @param willingness Willingness.
 * @return A reference to the output stream.
 */
inline std::ostream&
operator<<(std::ostream& os, Willingness willingness)
{
    switch (willingness)
    {
    case Willingness::NEVER:
        return (os << "NEVER");
    case Willingness::LOW:
        return (os << "LOW");
    case Willingness::DEFAULT:
        return (os << "DEFAULT");
    case Willingness::HIGH:
        return (os << "HIGH");
    case Willingness::ALWAYS:
        return (os << "ALWAYS");
    default:
        return (os << static_cast<uint32_t>(willingness)); // Cast to uint32_t to print correctly
    }
    return os;
}

/// @ingroup olsr
/// An Interface Association Tuple.
struct IfaceAssocTuple
{
    /// Interface address of a node.
    Ipv4Address ifaceAddr;
    /// Main address of the node.
    Ipv4Address mainAddr;
    /// Time at which this tuple expires and must be removed.
    Time time;
};

inline bool
operator==(const IfaceAssocTuple& a, const IfaceAssocTuple& b)
{
    return (a.ifaceAddr == b.ifaceAddr && a.mainAddr == b.mainAddr);
}

inline std::ostream&
operator<<(std::ostream& os, const IfaceAssocTuple& tuple)
{
    os << "IfaceAssocTuple(ifaceAddr=" << tuple.ifaceAddr << ", mainAddr=" << tuple.mainAddr
       << ", time=" << tuple.time << ")";
    return os;
}

/// @ingroup olsr
/// A Link Tuple.
struct LinkTuple
{
    /// Interface address of the local node.
    Ipv4Address localIfaceAddr;
    /// Interface address of the neighbor node.
    Ipv4Address neighborIfaceAddr;
    /// The link is considered bidirectional until this time.
    Time symTime;
    /// The link is considered unidirectional until this time.
    Time asymTime;
    /// Time at which this tuple expires and must be removed.
    Time time;
};

inline bool
operator==(const LinkTuple& a, const LinkTuple& b)
{
    return (a.localIfaceAddr == b.localIfaceAddr && a.neighborIfaceAddr == b.neighborIfaceAddr);
}

inline std::ostream&
operator<<(std::ostream& os, const LinkTuple& tuple)
{
    os << "LinkTuple(localIfaceAddr=" << tuple.localIfaceAddr
       << ", neighborIfaceAddr=" << tuple.neighborIfaceAddr << ", symTime=" << tuple.symTime
       << ", asymTime=" << tuple.asymTime << ", expTime=" << tuple.time << ")";
    return os;
}

/// @ingroup olsr
/// A Neighbor Tuple.
struct NeighborTuple
{
    /// Main address of a neighbor node.
    Ipv4Address neighborMainAddr;

    /// Status of the link (Symmetric or not Symmetric).
    enum Status
    {
        STATUS_NOT_SYM = 0, // "not symmetric"
        STATUS_SYM = 1,     // "symmetric"
    };

    /// Status of the link.
    Status status;

    /// A value between 0 and 7 specifying the node's willingness to carry traffic on behalf of
    /// other nodes.
    Willingness willingness;
};

inline bool
operator==(const NeighborTuple& a, const NeighborTuple& b)
{
    return (a.neighborMainAddr == b.neighborMainAddr && a.status == b.status &&
            a.willingness == b.willingness);
}

inline std::ostream&
operator<<(std::ostream& os, const NeighborTuple& tuple)
{
    os << "NeighborTuple(neighborMainAddr=" << tuple.neighborMainAddr
       << ", status=" << (tuple.status == NeighborTuple::STATUS_SYM ? "SYM" : "NOT_SYM")
       << ", willingness=" << tuple.willingness << ")";
    return os;
}

/// @ingroup olsr
/// A 2-hop Tuple.
struct TwoHopNeighborTuple
{
    /// Main address of a neighbor.
    Ipv4Address neighborMainAddr;
    /// Main address of a 2-hop neighbor with a symmetric link to nb_main_addr.
    Ipv4Address twoHopNeighborAddr;
    /// Time at which this tuple expires and must be removed.
    Time expirationTime; // previously called 'time_'
};

inline std::ostream&
operator<<(std::ostream& os, const TwoHopNeighborTuple& tuple)
{
    os << "TwoHopNeighborTuple(neighborMainAddr=" << tuple.neighborMainAddr
       << ", twoHopNeighborAddr=" << tuple.twoHopNeighborAddr
       << ", expirationTime=" << tuple.expirationTime << ")";
    return os;
}

inline bool
operator==(const TwoHopNeighborTuple& a, const TwoHopNeighborTuple& b)
{
    return (a.neighborMainAddr == b.neighborMainAddr &&
            a.twoHopNeighborAddr == b.twoHopNeighborAddr);
}

/// @ingroup olsr
/// An MPR-Selector Tuple.
struct MprSelectorTuple
{
    /// Main address of a node which have selected this node as a MPR.
    Ipv4Address mainAddr;
    /// Time at which this tuple expires and must be removed.
    Time expirationTime; // previously called 'time_'
};

inline bool
operator==(const MprSelectorTuple& a, const MprSelectorTuple& b)
{
    return (a.mainAddr == b.mainAddr);
}

// The type "list of interface addresses"
// typedef std::vector<nsaddr_t> addr_list_t;

/// @ingroup olsr
/// A Duplicate Tuple
struct DuplicateTuple
{
    /// Originator address of the message.
    Ipv4Address address;
    /// Message sequence number.
    uint16_t sequenceNumber;
    /// Indicates whether the message has been retransmitted or not.
    bool retransmitted;
    /// List of interfaces which the message has been received on.
    std::vector<Ipv4Address> ifaceList;
    /// Time at which this tuple expires and must be removed.
    Time expirationTime;
};

inline bool
operator==(const DuplicateTuple& a, const DuplicateTuple& b)
{
    return (a.address == b.address && a.sequenceNumber == b.sequenceNumber);
}

/// @ingroup olsr
/// A Topology Tuple
struct TopologyTuple
{
    /// Main address of the destination.
    Ipv4Address destAddr;
    /// Main address of a node which is a neighbor of the destination.
    Ipv4Address lastAddr;
    /// Sequence number.
    uint16_t sequenceNumber;
    /// Time at which this tuple expires and must be removed.
    Time expirationTime;
};

inline bool
operator==(const TopologyTuple& a, const TopologyTuple& b)
{
    return (a.destAddr == b.destAddr && a.lastAddr == b.lastAddr &&
            a.sequenceNumber == b.sequenceNumber);
}

inline std::ostream&
operator<<(std::ostream& os, const TopologyTuple& tuple)
{
    os << "TopologyTuple(destAddr=" << tuple.destAddr << ", lastAddr=" << tuple.lastAddr
       << ", sequenceNumber=" << (int)tuple.sequenceNumber
       << ", expirationTime=" << tuple.expirationTime << ")";
    return os;
}

/// @ingroup olsr
/// Association
struct Association
{
    Ipv4Address networkAddr; //!< IPv4 Network address.
    Ipv4Mask netmask;        //!< IPv4 Network mask.
};

inline bool
operator==(const Association& a, const Association& b)
{
    return (a.networkAddr == b.networkAddr && a.netmask == b.netmask);
}

inline std::ostream&
operator<<(std::ostream& os, const Association& tuple)
{
    os << "Association(networkAddr=" << tuple.networkAddr << ", netmask=" << tuple.netmask << ")";
    return os;
}

/// @ingroup olsr
/// An Association Tuple
struct AssociationTuple
{
    /// Main address of the gateway.
    Ipv4Address gatewayAddr;
    /// Network Address of network reachable through gatewayAddr
    Ipv4Address networkAddr;
    /// Netmask of network reachable through gatewayAddr
    Ipv4Mask netmask;
    /// Time at which this tuple expires and must be removed
    Time expirationTime;
};

inline bool
operator==(const AssociationTuple& a, const AssociationTuple& b)
{
    return (a.gatewayAddr == b.gatewayAddr && a.networkAddr == b.networkAddr &&
            a.netmask == b.netmask);
}

inline std::ostream&
operator<<(std::ostream& os, const AssociationTuple& tuple)
{
    os << "AssociationTuple(gatewayAddr=" << tuple.gatewayAddr
       << ", networkAddr=" << tuple.networkAddr << ", netmask=" << tuple.netmask
       << ", expirationTime=" << tuple.expirationTime << ")";
    return os;
}

typedef std::set<Ipv4Address> MprSet;                       //!< MPR Set type.
typedef std::vector<MprSelectorTuple> MprSelectorSet;       //!< MPR Selector Set type.
typedef std::vector<LinkTuple> LinkSet;                     //!< Link Set type.
typedef std::vector<NeighborTuple> NeighborSet;             //!< Neighbor Set type.
typedef std::vector<TwoHopNeighborTuple> TwoHopNeighborSet; //!< 2-hop Neighbor Set type.
typedef std::vector<TopologyTuple> TopologySet;             //!< Topology Set type.
typedef std::vector<DuplicateTuple> DuplicateSet;           //!< Duplicate Set type.
typedef std::vector<IfaceAssocTuple> IfaceAssocSet;         //!< Interface Association Set type.
typedef std::vector<AssociationTuple> AssociationSet;       //!< Association Set type.
typedef std::vector<Association> Associations;              //!< Association Set type.

} // namespace olsr
} // namespace ns3

#endif /* OLSR_REPOSITORIES_H */
