// Demonstrates: module declaration, submodule instantiation on one line,
// module-level init $...$, and hierarchy navigation functions.
//
// System logs hierarchy info at cycle 0, then workers wait until their
// individual start_at cycle before logging.
//
// Expected output:
// (0,0) TOP.sys   : Hierarchy rooted at sys:
// ---------------------
//  module ID  : TOP.sys
//  type       : System
//  ...
//  submodules :
//         - a of type Worker
//         - b of type Worker
// ...
// (3,0) TOP.sys.a : a  full: TOP.sys.a  parent: sys  start_at: 3
// (7,0) TOP.sys.b : b  full: TOP.sys.b  parent: sys  start_at: 7
// Simulation stopped at time (100,0)

// --8<-- [start:model]
module Top
    submodule sys : System
    // Module-level init: runs in the constructor before simulation starts.
    // Can set fields on direct submodule instances.
    init
    $
        sys.a.start_at = 3;
        sys.b.start_at = 7;
    $
end module

module System
    submodule a, b : Worker     // two Worker instances declared on one line
    behavior
        $
        log << endl << "Hierarchy rooted at " << instanceId() << ":";
        log << "\n" << getInfo();
        $;
    end behavior
end module

module Worker
    decl $int start_at;$
    init $start_at = 0;$     // default value; overridden by Top's init block
    behavior
        wait until (this_cycle >= start_at);
        $
        log << endl << instanceId()
                    << "  full: "     << hierarchicalId()
                    << "  parent: "   << parent()->instanceId()
                    << "  start_at: " << start_at;
        $;
    end behavior
end module
// --8<-- [end:model]