// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2025 by Petr Nohavica
// SPDX-License-Identifier: CC0-1.0

`define stop $stop
`define checkh(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d:  got='h%x exp='h%x\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
`define checks(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d:  got='%s' exp='%s'\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);

interface class IBottomMid;
  pure virtual function void moo(int i);
endclass

interface class IBottom;
  pure virtual function bit foo();
endclass

interface class IMid extends IBottomMid;
  pure virtual function string bar();
endclass

class bottom_class implements IBottom;
  string name;

  function new(string name);
    this.name = name;
  endfunction

  virtual function bit foo();
    $display("%s", name);
    return 1'b0;
  endfunction
endclass

class middle_class extends bottom_class implements IMid, IBottom;
  function new(string name);
    super.new($sformatf("middle %0s", name));
  endfunction

  virtual function bit foo();
    $display("%s", name);
    return 0;
  endfunction

  virtual function void moo(int i);
    $display("moo: %d", i);
  endfunction

  virtual function string bar();
   return name;
  endfunction
endclass

class top_class extends middle_class;
  int i;
  function new(string name, int i);
    super.new($sformatf("%0s %0d", name, i));
    this.i = i;
  endfunction
endclass

class sky_class extends top_class;
  function new(string name);
    super.new(name, 42);
  endfunction
endclass


module t;

  initial begin
    sky_class s = new("ahoj");
    bottom_class b = s;
    top_class t = s;
    IMid im;

    `checks( b.name, "middle ahoj 42" );
    `checks( s.name, "middle ahoj 42" );
    `checks( t.name, "middle ahoj 42" );
    `checkh( t.i, 42);
    `checks(s.bar(), "middle ahoj 42");
    im = s;
    im.moo(42);

    $finish;
  end

endmodule