/**
 * jspsych-survey-multi-choice
 * a jspsych plugin for multiple choice survey questions
 *
 * Shane Martin
 *
 * documentation: docs.jspsych.org
 *
 */


jsPsych.plugins['survey-multi-choice'] = (function() {
  var plugin = {};

  plugin.info = {
    name: 'survey-multi-choice',
    description: '',
    parameters: {
      questions: {
        type: [jsPsych.plugins.parameterType.STRING],
        array: true,
        default: undefined,
        no_function: false,
        description: ''
      },
      options: {
        type: [jsPsych.plugins.parameterType.STRING],
        array: true,
        default: undefined,
        no_function: false,
        description: ''
      },
      required: {
        type: [jsPsych.plugins.parameterType.BOOL],
        array: true,
        default: false,
        no_function: false,
        description: ''
      },
      horitzontal: {
        type: [jsPsych.plugins.parameterType.BOOL],
        default: false,
        no_function: false,
        description: ''
      },
      preamble: {
        type: [jsPsych.plugins.parameterType.STRING],
        default: '',
        no_function: false,
        description: ''
      }
    }
  }
  plugin.trial = function(display_element, trial) {
    var plugin_id_name = "jspsych-survey-multi-choice";
    var plugin_id_selector = '#' + plugin_id_name;
    var _join = function( /*args*/ ) {
      var arr = Array.prototype.slice.call(arguments, _join.length);
      return arr.join(separator = '-');
    }

    // trial defaults
    trial.preamble = typeof trial.preamble == 'undefined' ? "" : trial.preamble;
    trial.required = typeof trial.required == 'undefined' ? null : trial.required;
    trial.horizontal = typeof trial.required == 'undefined' ? false : trial.horizontal;

    // if any trial variables are functions
    // this evaluates the function and replaces
    // it with the output of the function
    trial = jsPsych.pluginAPI.evaluateFunctionParameters(trial);

    // inject CSS for trial
    var node = display_element.innerHTML += '<style id="jspsych-survey-multi-choice-css">';
    var cssstr = ".jspsych-survey-multi-choice-question { margin-top: 2em; margin-bottom: 2em; text-align: left; }"+
      ".jspsych-survey-multi-choice-text span.required {color: darkred;}"+
      ".jspsych-survey-multi-choice-horizontal .jspsych-survey-multi-choice-text {  text-align: center;}"+
      ".jspsych-survey-multi-choice-option { line-height: 2; }"+
      ".jspsych-survey-multi-choice-horizontal .jspsych-survey-multi-choice-option {  display: inline-block;  margin-left: 1em;  margin-right: 1em;  vertical-align: top;}"+
      "label.jspsych-survey-multi-choice-text input[type='radio'] {margin-right: 1em;}"

    display_element.querySelector('#jspsych-survey-multi-choice-css').innerHTML = cssstr;

    // form element
    var trial_form_id = _join(plugin_id_name, "form");
    console.log("trial_form_id", trial_form_id)
    display_element.innerHTML += '<form id="'+trial_form_id+'"></form>';
    var trial_form = display_element.querySelector("#" + trial_form_id);
    console.log("trial_form", trial_form)
    // show preamble text
    var preamble_id_name = _join(plugin_id_name, 'preamble');
    trial_form.innerHTML += '<div id="'+preamble_id_name+'" class="'+preamble_id_name+'">'+trial.preamble+'</div>';

    // add multiple-choice questions
    for (var i = 0; i < trial.questions.length; i++) {
      // create question container
      var question_classes = [_join(plugin_id_name, 'question')];
      if (trial.horizontal) {
        question_classes.push(_join(plugin_id_name, 'horizontal'));
      }
    
      trial_form.innerHTML += '<div id="'+_join(plugin_id_name, i)+'" class="'+question_classes.join(' ')+'"></div>';
    
      var question_selector = _join(plugin_id_selector, i);
    
      // add question text
      display_element.querySelector(question_selector).innerHTML += '<p class="' + plugin_id_name + '-text survey-multi-choice">' + trial.questions[i] + '</p>';

      // create option radio buttons
      for (var j = 0; j < trial.options[i].length; j++) {
        var option_id_name = _join(plugin_id_name, "option", i, j),
          option_id_selector = '#' + option_id_name;
    
        // add radio button container
        display_element.querySelector(question_selector).innerHTML += '<div id="'+option_id_name+'" class="'+_join(plugin_id_name, 'option')+'"></div>';
    
        // add label and question text
        var option_label = '<label class="' + plugin_id_name + '-text">' + trial.options[i][j] + '</label>';
        display_element.querySelector(option_id_selector).innerHTML += option_label;
    
        // create radio button
        var input_id_name = _join(plugin_id_name, 'response', i);
        display_element.querySelector(option_id_selector + " label").innerHTML =
          '<input type="radio" name="'+ input_id_name + '" value="' + trial.options[i][j] + '">' +
          display_element.querySelector(option_id_selector + " label").innerHTML;
      }

      if (trial.required && trial.required[i]) {
        // add "question required" asterisk
        display_element.querySelector(question_selector + " p").innerHMTL += "<span class='required'>*</span>";
    
        // add required property
        display_element.querySelector(question_selector + " input").required = true;
      }
    }
    // add submit button
    trial_form.innerHTML += '<input type="submit" id="'+plugin_id_name+'-next" class="'+plugin_id_name+' jspsych-btn">Submit Answers</input>';

    trial_form.addEventListener('submit', function(event) {
      event.preventDefault();
      var matches = display_element.querySelectorAll("div." + plugin_id_name + "-question");
      console.log("are you getting called")
      // measure response time
      var endTime = (new Date()).getTime();
      var response_time = endTime - startTime;

      // create object to hold responses
      var question_data = {};
      //TODO this is having problems 
      var matches = display_element.querySelectorAll("div." + plugin_id_name + "-question");
      var inputs = document.getElementsByTagName('input');
      var radios = []
      for(var i=0;i<inputs.length;i++){
        if(inputs[i].checked){
          radios.push(inputs[i].value)
        }
      }
      matches.forEach(function(currentEl ,index){
        console.log("currentEl", currentEl,index)
        var id = "Q" + index;
        var obje = {};
        obje[id] = radios[index];
        Object.assign(question_data, obje);
      })
      // save data
      var trial_data = {
        "rt": response_time,
        "responses": JSON.stringify(question_data)
      };
      display_element.innerHTML = '';
    
      // next trial
      jsPsych.finishTrial(trial_data);
    });
    
    var startTime = (new Date()).getTime();
  };

  return plugin;
})();