H5P.Question.call(self, 'blanks');

Blanks.prototype = Object.create(H5P.Question.prototype);

Blanks.prototype.constructor = Blanks;

/**
 * Registers this question type's DOM elements before they are attached.
 * Called from H5P.Question.
 */
Blanks.prototype.registerDomElements = function () {
  var self = this;

  if (self.params.image) {
    // Register task image
    self.setImage(self.params.image.path);
  }

  // Register task introduction text
  self.setIntroduction(self.params.text);

  // Register task content area
  self.setContent(self.createQuestions(), {
    'class': self.params.behaviour.separateLines ? 'h5p-separate-lines' : ''
  });
  // ... and buttons
  self.registerButtons();
};

/**
 * Create all the buttons for the task
 */
Blanks.prototype.registerButtons = function () {
  var self = this;

  if (!self.params.behaviour.autoCheck) {
    // Check answer button
    self.addButton('check-answer', self.params.checkAnswer, function () {
      self.toggleButtonVisibility(STATE_CHECKING);
      self.markResults();
      self.showEvaluation();
      self.triggerXAPICompleted(self.getScore(), self.getMaxScore());
    });
  }

  // Check answer button
  self.addButton('show-solution', self.params.showSolutions, function () {
    if (self.allBlanksFilledOut()) {
      self.toggleButtonVisibility(STATE_SHOWING_SOLUTION);
      self.showCorrectAnswers();
    }
  }, self.params.behaviour.enableSolutionsButton);

  // Try again button
  if (self.params.behaviour.enableRetry === true) {
    self.addButton('try-again', self.params.tryAgain, function () {
      self.removeMarkedResults();
      self.hideSolutions();
      self.hideEvaluation();
      self.clearAnswers();
      self.resetGrowTextField();
      self.done = false;
      self.toggleButtonVisibility(STATE_ONGOING);
      self.$questions.filter(':first').find('input:first').focus();
    });
  }
  self.toggleButtonVisibility(STATE_ONGOING);
};