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!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 = [[
    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",
      () -> {
        print("find unmapped line z");
        if (empty(unmappedLines)) false;
        Iterator<S> it = shuffledIterator(cloneList(unmappedLines));
        IF0<O> alternative = new IF0<O> {
          public O get() {
            if (!it.hasNext()) false;
            ret bot.withAlternative(this, litcimap(z := it.next()));
          }
        };
        ret alternative!;
      });

    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.onProcedureEnded.add(voidfunc(O proc, PhilosophyBot1.Path path) {
     print("A procedure ended after " + nSteps(path.steps) + ": " + path);
   });

   bot.addNativePredicate("run x with backtracking",
     (SS map) -> {
        S x = map.get("x");
        new PhilosophyBot1.Path path;
        bot.runParsedProcedure(bot.parseProcedure(x), path);

        while licensed {
          if (!path.valid) ret true with print("Path not valid anymore");
          print("Have " + nSteps(path.steps));
          if (empty(path.steps)) ret true with print("Path is empty, nothing to backtrack");
          PhilosophyBot1.Step step = last(path.steps);
          print("Backtracking last step: " + step);
          O result = step.alternative();
          print("  Result: " + result);
          if (isFalse(result)) {
            print("Discarding last step as it is done");
            popLast(path.steps);
          }
        }

        true;
     });
   
   bot.run();
  }
}