var jsPsychVideoSliderResponse = (function (jspsych) {
  'use strict';

  const info = {
      name: "video-slider-response",
      parameters: {
          /** Array of the video file(s) to play. Video can be provided in multiple file formats for better cross-browser support. */
          stimulus: {
              type: jspsych.ParameterType.VIDEO,
              pretty_name: "Video",
              default: undefined,
              array: true,
          },
          /** Any content here will be displayed below the stimulus. */
          prompt: {
              type: jspsych.ParameterType.HTML_STRING,
              pretty_name: "Prompt",
              default: null,
          },
          /** The width of the video in pixels. */
          width: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Width",
              default: "",
          },
          /** The height of the video display in pixels. */
          height: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Height",
              default: "",
          },
          /** If true, the video will begin playing as soon as it has loaded. */
          autoplay: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "Autoplay",
              default: true,
          },
          /** If true, the subject will be able to pause the video or move the playback to any point in the video. */
          controls: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "Controls",
              default: false,
          },
          /** Time to start the clip. If null (default), video will start at the beginning of the file. */
          start: {
              type: jspsych.ParameterType.FLOAT,
              pretty_name: "Start",
              default: null,
          },
          /** Time to stop the clip. If null (default), video will stop at the end of the file. */
          stop: {
              type: jspsych.ParameterType.FLOAT,
              pretty_name: "Stop",
              default: null,
          },
          /** The playback rate of the video. 1 is normal, <1 is slower, >1 is faster. */
          rate: {
              type: jspsych.ParameterType.FLOAT,
              pretty_name: "Rate",
              default: 1,
          },
          /** Sets the minimum value of the slider. */
          min: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Min slider",
              default: 0,
          },
          /** Sets the maximum value of the slider. */
          max: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Max slider",
              default: 100,
          },
          /** Sets the starting value of the slider. */
          slider_start: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Slider starting value",
              default: 50,
          },
          /** Sets the step of the slider. */
          step: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Step",
              default: 1,
          },
          /** Array containing the labels for the slider. Labels will be displayed at equidistant locations along the slider. */
          labels: {
              type: jspsych.ParameterType.HTML_STRING,
              pretty_name: "Labels",
              default: [],
              array: true,
          },
          /** Width of the slider in pixels. */
          slider_width: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Slider width",
              default: null,
          },
          /** Label of the button to advance. */
          button_label: {
              type: jspsych.ParameterType.STRING,
              pretty_name: "Button label",
              default: "Continue",
          },
          /** If true, the participant will have to move the slider before continuing. */
          require_movement: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "Require movement",
              default: false,
          },
          /** If true, the trial will end immediately after the video finishes playing. */
          trial_ends_after_video: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "End trial after video finishes",
              default: false,
          },
          /** How long to show trial before it ends. */
          trial_duration: {
              type: jspsych.ParameterType.INT,
              pretty_name: "Trial duration",
              default: null,
          },
          /** If true, the trial will end when subject makes a response. */
          response_ends_trial: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "Response ends trial",
              default: true,
          },
          /** If true, then responses are allowed while the video is playing. If false, then the video must finish playing before a response is accepted. */
          response_allowed_while_playing: {
              type: jspsych.ParameterType.BOOL,
              pretty_name: "Response allowed while playing",
              default: true,
          },
      },
  };
  /**
   * **video-slider-response**
   *
   * jsPsych plugin for playing a video file and getting a slider response
   *
   * @author Josh de Leeuw
   * @see {@link https://www.jspsych.org/plugins/jspsych-video-slider-response/ video-slider-response plugin documentation on jspsych.org}
   */
  class VideoSliderResponsePlugin {
      constructor(jsPsych) {
          this.jsPsych = jsPsych;
      }
      trial(display_element, trial) {
          // half of the thumb width value from jspsych.css, used to adjust the label positions
          var half_thumb_width = 7.5;
          // setup stimulus
          var video_html = '<video id="jspsych-video-slider-response-stimulus-video"';
          if (trial.width) {
              video_html += ' width="' + trial.width + '"';
          }
          if (trial.height) {
              video_html += ' height="' + trial.height + '"';
          }
          if (trial.autoplay && trial.start == null) {
              // if autoplay is true and the start time is specified, then the video will start automatically
              // via the play() method, rather than the autoplay attribute, to prevent showing the first frame
              video_html += " autoplay ";
          }
          if (trial.controls) {
              video_html += " controls ";
          }
          if (trial.start !== null) {
              // hide video element when page loads if the start time is specified,
              // to prevent the video element from showing the first frame
              video_html += ' style="visibility: hidden;"';
          }
          video_html += ">";
          var video_preload_blob = this.jsPsych.pluginAPI.getVideoBuffer(trial.stimulus[0]);
          if (!video_preload_blob) {
              for (var i = 0; i < trial.stimulus.length; i++) {
                  var file_name = trial.stimulus[i];
                  if (file_name.indexOf("?") > -1) {
                      file_name = file_name.substring(0, file_name.indexOf("?"));
                  }
                  var type = file_name.substr(file_name.lastIndexOf(".") + 1);
                  type = type.toLowerCase();
                  if (type == "mov") {
                      console.warn("Warning: video-slider-response plugin does not reliably support .mov files.");
                  }
                  video_html += '<source src="' + file_name + '" type="video/' + type + '">';
              }
          }
          video_html += "</video>";
          var html = '<div id="jspsych-video-slider-response-wrapper" style="margin: 100px 0px;">';
          html += '<div id="jspsych-video-slider-response-stimulus">' + video_html + "</div>";
          html +=
              '<div class="jspsych-video-slider-response-container" style="position:relative; margin: 0 auto 3em auto; width:';
          if (trial.slider_width !== null) {
              html += trial.slider_width + "px;";
          }
          else {
              html += "auto;";
          }
          html += '">';
          html +=
              '<input type="range" class="jspsych-slider" value="' +
                  trial.slider_start +
                  '" min="' +
                  trial.min +
                  '" max="' +
                  trial.max +
                  '" step="' +
                  trial.step +
                  '" id="jspsych-video-slider-response-response"';
          if (!trial.response_allowed_while_playing) {
              html += " disabled";
          }
          html += "></input><div>";
          for (var j = 0; j < trial.labels.length; j++) {
              var label_width_perc = 100 / (trial.labels.length - 1);
              var percent_of_range = j * (100 / (trial.labels.length - 1));
              var percent_dist_from_center = ((percent_of_range - 50) / 50) * 100;
              var offset = (percent_dist_from_center * half_thumb_width) / 100;
              html +=
                  '<div style="border: 1px solid transparent; display: inline-block; position: absolute; ' +
                      "left:calc(" +
                      percent_of_range +
                      "% - (" +
                      label_width_perc +
                      "% / 2) - " +
                      offset +
                      "px); text-align: center; width: " +
                      label_width_perc +
                      '%;">';
              html += '<span style="text-align: center; font-size: 80%;">' + trial.labels[j] + "</span>";
              html += "</div>";
          }
          html += "</div>";
          html += "</div>";
          html += "</div>";
          // add prompt if there is one
          if (trial.prompt !== null) {
              html += "<div>" + trial.prompt + "</div>";
          }
          // add submit button
          var next_disabled_attribute = "";
          if (trial.require_movement || !trial.response_allowed_while_playing) {
              next_disabled_attribute = "disabled";
          }
          html +=
              '<button id="jspsych-video-slider-response-next" class="jspsych-btn" ' +
                  next_disabled_attribute +
                  ">" +
                  trial.button_label +
                  "</button>";
          display_element.innerHTML = html;
          var video_element = display_element.querySelector("#jspsych-video-slider-response-stimulus-video");
          if (video_preload_blob) {
              video_element.src = video_preload_blob;
          }
          video_element.onended = () => {
              if (trial.trial_ends_after_video) {
                  end_trial();
              }
              else if (!trial.response_allowed_while_playing) {
                  enable_slider();
              }
          };
          video_element.playbackRate = trial.rate;
          // if video start time is specified, hide the video and set the starting time
          // before showing and playing, so that the video doesn't automatically show the first frame
          if (trial.start !== null) {
              video_element.pause();
              video_element.onseeked = () => {
                  video_element.style.visibility = "visible";
                  video_element.muted = false;
                  if (trial.autoplay) {
                      video_element.play();
                  }
                  else {
                      video_element.pause();
                  }
                  video_element.onseeked = () => { };
              };
              video_element.onplaying = () => {
                  video_element.currentTime = trial.start;
                  video_element.onplaying = () => { };
              };
              // fix for iOS/MacOS browsers: videos aren't seekable until they start playing, so need to hide/mute, play,
              // change current time, then show/unmute
              video_element.muted = true;
              video_element.play();
          }
          let stopped = false;
          if (trial.stop !== null) {
              video_element.addEventListener("timeupdate", (e) => {
                  var currenttime = video_element.currentTime;
                  if (currenttime >= trial.stop) {
                      video_element.pause();
                      if (trial.trial_ends_after_video && !stopped) {
                          // this is to prevent end_trial from being called twice, because the timeupdate event
                          // can fire in quick succession
                          stopped = true;
                          end_trial();
                      }
                  }
              });
          }
          if (trial.require_movement) {
              const enable_button = () => {
                  display_element.querySelector("#jspsych-video-slider-response-next").disabled = false;
              };
              display_element
                  .querySelector("#jspsych-video-slider-response-response")
                  .addEventListener("mousedown", enable_button);
              display_element
                  .querySelector("#jspsych-video-slider-response-response")
                  .addEventListener("touchstart", enable_button);
          }
          var startTime = performance.now();
          // store response
          var response = {
              rt: null,
              response: null,
          };
          // function to end trial when it is time
          const end_trial = () => {
              // kill any remaining setTimeout handlers
              this.jsPsych.pluginAPI.clearAllTimeouts();
              // stop the video file if it is playing
              // remove any remaining end event handlers
              display_element
                  .querySelector("#jspsych-video-slider-response-stimulus-video")
                  .pause();
              display_element.querySelector("#jspsych-video-slider-response-stimulus-video").onended = () => { };
              // gather the data to store for the trial
              var trial_data = {
                  rt: response.rt,
                  stimulus: trial.stimulus,
                  start: trial.start,
                  slider_start: trial.slider_start,
                  response: response.response,
              };
              // clear the display
              display_element.innerHTML = "";
              // move on to the next trial
              this.jsPsych.finishTrial(trial_data);
          };
          display_element
              .querySelector("#jspsych-video-slider-response-next")
              .addEventListener("click", () => {
              // measure response time
              var endTime = performance.now();
              response.rt = Math.round(endTime - startTime);
              response.response = display_element.querySelector("#jspsych-video-slider-response-response").valueAsNumber;
              if (trial.response_ends_trial) {
                  end_trial();
              }
              else {
                  display_element.querySelector("#jspsych-video-slider-response-next").disabled = true;
              }
          });
          // function to enable slider after video ends
          function enable_slider() {
              document.querySelector("#jspsych-video-slider-response-response").disabled = false;
              if (!trial.require_movement) {
                  document.querySelector("#jspsych-video-slider-response-next").disabled = false;
              }
          }
          // end trial if time limit is set
          if (trial.trial_duration !== null) {
              this.jsPsych.pluginAPI.setTimeout(end_trial, trial.trial_duration);
          }
      }
  }
  VideoSliderResponsePlugin.info = info;

  return VideoSliderResponsePlugin;

})(jsPsychModule);
