!7

cmodule PhilosophyBot2 extends DynPrintLog {
  transient L unmappedLines = ll("good", "early morning");
  transient L unmappedQuestions = ll("what is the time", "how do you feel");
  transient SS mappings = ciMap();
  
  transient S program = [[
    start
    
    start => proc {
      run (proc {
        while (there are unmapped questions):
          find (an unmapped question) x
          find (an unmapped line) y
          map x to y
      }
) with backtracking
    }
  ]];
  
  transient new PhilosophyBot1 bot;

  start-thread {
    bot.program = program;
    bot.addNativePredicate("there are unmapped questions",
      () -> nempty(unmappedQuestions));
    bot.addNativePredicate("find (an unmapped question) x",
      () -> {
        print("find unmapped question x");
        if (empty(unmappedQuestions)) false;
        Iterator<S> it = shuffledIterator(cloneList(unmappedQuestions));
        IF0<O> alternative = new IF0<O> {
          public O get() {
            if (!it.hasNext()) false;
            ret bot.withAlternative(this, litcimap(x := it.next()));
          }
        };
        ret alternative!;
      });

    bot.addNativePredicate("find (an unmapped line) z",
      (map, env) -> {
        print("find unmapped line z");
        if (empty(unmappedLines)) false;
        if (!env.wantAlternatives())
          ret litcimap(z := random(unmappedLines));
        ret mapI(shuffledIterator(cloneList(unmappedLines)), z -> litcimap(+z));
      });

    bot.addNativePredicate("map x to y",
      (SS map) -> {
        S x = map.get("x"), y = map.get("y");
        unmappedQuestions.remove(x);
        unmappedLines.remove(y);
        print("Remaining unmapped questions: " + l(unmappedQuestions));
        mappings.put(x, y);
        print("Mapped question " + quote(x) + " to answer " + quote(y));
        ret bot.withAlternative(() -> {
          print("Undoing mapping of " + quote(x) + " to answer " + quote(y));
          unmappedQuestions.add(x);
          unmappedLines.add(y);
          false;
        }, true);
      });

   bot.addNativePredicate("run x with backtracking",
     (SS map) -> {
        S x = map.get("x");
        print("Run x with backtracking: " + x);
        bot.runParsedProcedure(bot.parseProcedure(x)); // TODO
        print("Ran x with backtracking: " + x);
        true;
     });
   
   bot.run();
  }
}