// ----------------------------------------------------------------------
// Monitor for AXI transactions
// ----------------------------------------------------------------------
class axi_monitor extends uvm_monitor; // #(axi_transaction);
    virtual `AXI_INTF.MANAGER m_if;
    virtual `AXI_INTF.SUBORDINATE s_if;
    agent_type_t agent_type;

    // Declare the analysis export
    uvm_analysis_port ap;

    // Filehandle for transaction tracker file
    int trk_file;

    `uvm_component_utils(axi_monitor)

    // --------------------------------------------------
    // Constructor
    function new(string name = "axi_monitor", uvm_component parent = null);
        super.new(name, parent);
        ap = new("analysis_export", this);
    endfunction

    // --------------------------------------------------
    // Set agent type
    function void set_agent_type(agent_type_t atype);
        agent_type = atype;
        `uvm_info("set_agent_type", $sformatf("Agent type set to %s", agent_type.name()), UVM_LOW)
    endfunction

    // --------------------------------------------------
    // Set virtual interfaces
    function void set_virtual_intefaces(virtual `AXI_INTF.MANAGER m_if_p,
                                        virtual `AXI_INTF.SUBORDINATE s_if_p);
        `uvm_info("set_virtual_intefaces", $sformatf("Setting virtual interfaces"), UVM_LOW)

        m_if = m_if_p;
        s_if = s_if_p;
    endfunction

    // --------------------------------------------------
    // Run phase
    virtual function void run_phase(uvm_phase phase);
        // Open transaction log file
        trk_file = $fopen($sformatf("axi_transactions.%s.log", agent_type.name()), "w");
        if (trk_file == 0) begin
            `uvm_error("AXI_MONITOR", "Failed to open transaction log file")
        end else begin
            `uvm_info("AXI_MONITOR", "Transaction log file opened successfully", UVM_LOW)
        end

        // Start monitoring
        do_monitor();
    endfunction

    // --------------------------------------------------
    // Monitor logic to capture transactions
    virtual task do_monitor();
        if (agent_type == MANAGER) begin
            do_manager_monitor();
        end else if (agent_type == SUBORDINATE) begin
            do_subordinate_monitor();
        end else begin
            `uvm_fatal("AXI_MONITOR", "Unknown agent type")
        end
    endtask

    // --------------------------------------------------
    // Monitor logic for MANAGER agent
    virtual task do_manager_monitor();
        // Placeholder for actual monitoring logic
        // This would typically involve sampling signals and creating transactions
        forever begin
            axi_transaction txn;
            @(posedge m_if.ACLK);

            txn = axi_transaction::type_id::create("txn");

            // Capture transaction details here

            ap.write(txn);
            write_transaction_to_file(txn);
        end
    endtask

    // --------------------------------------------------
    // Monitor logic for SUBORDINATE agent
    virtual task do_subordinate_monitor();
        // Placeholder for actual monitoring logic
        // This would typically involve sampling signals and creating transactions
        forever begin
            axi_transaction txn;
            @(posedge s_if.ACLK);

            txn = axi_transaction::type_id::create("txn");

            // Capture transaction details here

            ap.write(txn);
            write_transaction_to_file(txn);
        end
    endtask

    // --------------------------------------------------
    // Report phase
    virtual function void report_phase(uvm_phase phase);
        // Report any captured transactions or statistics
        `uvm_info("axi_monitor", $sformatf("Reporting on %s",
            get_full_name()), UVM_LOW)
    endfunction

    // --------------------------------------------------
    // Function to write captured transaction into a file
    function void write_transaction_to_file(axi_transaction txn);
        $fwrite(trk_file, "%s\n", txn.sprint());
    endfunction
endclass : axi_monitor