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#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/internet-module.h"
#include "ns3/log.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("AmfSmfSessionManagement");

// Define classes to simulate the behavior of AMF and SMF
class AMF : public Object {
public:
    // Constructor
    AMF(Ptr<Node> node) : m_node(node) {}

    // Simulate session establishment request to SMF
    void RequestSessionEstablishment() {
        NS_LOG_INFO("AMF requesting session establishment from SMF.");
        m_smf->EstablishSession();
    }

    // Attach SMF for communication
    void AttachSmf(Ptr<SMF> smf) {
        m_smf = smf;
    }

private:
    Ptr<Node> m_node;
    Ptr<SMF> m_smf;
};

class SMF : public Object {
public:
    // Constructor
    SMF(Ptr<Node> node) : m_node(node) {}

    // Handle session establishment
    void EstablishSession() {
        NS_LOG_INFO("SMF establishing PDU session.");
        // Further logic for establishing a session could go here
    }

    // Modify an existing session
    void ModifySession() {
        NS_LOG_INFO("SMF modifying PDU session.");
    }

    // Release a session
    void ReleaseSession() {
        NS_LOG_INFO("SMF releasing PDU session.");
    }

private:
    Ptr<Node> m_node;
};

int main(int argc, char *argv[]) {
    CommandLine cmd;
    cmd.Parse(argc, argv);

    // Create nodes
    NodeContainer nodes;
    nodes.Create(2);

    // Create AMF and SMF instances
    Ptr<AMF> amf = CreateObject<AMF>(nodes.Get(0));
    Ptr<SMF> smf = CreateObject<SMF>(nodes.Get(1));

    // Link AMF and SMF
    amf->AttachSmf(smf);

    // Schedule simulation tasks
    Simulator::Schedule(Seconds(1.0), &AMF::RequestSessionEstablishment, amf);
    Simulator::Schedule(Seconds(5.0), &SMF::ModifySession, smf);
    Simulator::Schedule(Seconds(10.0), &SMF::ReleaseSession, smf);

    // Run simulation
    Simulator::Stop(Seconds(15.0));
    Simulator::Run();
    Simulator::Destroy();

    return 0;
}