!759

!include #1004810 // Concepts etc.

//include #1004817 // externalize stuff (repeat less code)

// What we think the user chose
sclass OptionChosen extends Concept {
  new Ref<UserAnswer> userAnswer;
  S choice;
}

extend Answer {
  new Ref<OptionChosen> inResponseTo;
}

p {
  loadConcepts();
  autoSaveConcepts();
  action();
}

static void processNewUserLine(UserLine ul) {
  S s = trim(ul.post.text);
  
  if (swic(s, "?id ")) { // assume "?id music"
    // action: ask user what he means by "music"
    
    S q = trim(s.substring(2));
    print("ul= " + structure(ul));
    Question question = findBackRefOfType(ul, Question.class);
    print("Question = " + struct(question));
    
    // did we ask this yet? if not: do it
    
    if (question == null) {
      S text = "Uh... do you want some MUSIC or the MUSIC PLAYER?";
      UserLine ulQ = postToChat(text);
      if (ulQ == null) { print("Couldn't post!"); ret; }
      question = new Question;
      question.userLine.set(ulQ);
      question = new Question(ul);
    }
  }
}

static void dbActions {
  // Scan through the answers we got from user and do something
  // with them.
  
  L<UserAnswer> userAnswers = conceptsOfType(UserAnswer.class);
  //printStructure("User Answers: ", userAnswers);
  for (UserAnswer ua : userAnswers) {
    // We only ask one question, so we know what this is about
    
    ELPost post = ua.userLine.get().post;
    //print("Processing: " + post.text);
    
    OptionChosen option = findBackRef(ua, OptionChosen.class);
    
    if (option == null) {
      // Interpret & save what user has said (-> "OptionChosen")
    
      option = new OptionChosen;
      option.userAnswer.set(ua);
      option.choice = getOption(trim(post.text));

      // VERIFY new link
      
      assertSame(option, findBackRef(ua, OptionChosen.class));
    }
    
    // Check if we answered already.
    
    Answer ourAnswer = findBackRef(option, Answer.class);
    
    if (ourAnswer != null) {
      //print("  We answered already.");
    } else {
      ourAnswer = new Answer;
      ourAnswer.inResponseTo.set(option);

      // VERIFY that we solved the condition above
      assertSame(ourAnswer, findBackRef(option, Answer.class));
      
      S text = makeAnswer(option);
      UserLine ulA = postToChat(text);
      if (ulA == null) { print("Couldn't post!"); ret; }
      ourAnswer.userLine.set(ulA);
    }
  }
}

// learnable! [interpret user input]
// returns "music", "player" or null (any unknown input)
static S getOption(S s) {
  if (containsIgnoreCase(s, "player")) ret "player";
  if (containsIgnoreCase(s, "music")) ret "music";
  null;
}

static S makeAnswer(OptionChosen option) {
  if (eq(option.choice, "player"))
    ret "Current Music Player Is: " + snippetWithTitle("#1003779");
  if (eq(option.choice, "music"))
    ret "Here's some polish music: " + snippetWithTitle("#1001093");
  ret "I don't understand";
}