safari-books-online.js

## safari-books-online.js
var kdp;
var scrubInSeconds = 10;
var altModifier = 2;
var shiftModifier = 3;
var paused = false;
var tocWrapperScrollTop = 0;
var tocWrapperScrollEventAttached = false;
var course_id = RegExp(/\d+/g).exec(location.href)[0];

var styles = {
  percentage: {
    position: "absolute",
    right: "25px",
    top: "25px",
    "font-size": "larger",
    "font-weight": "bold"
  },
  tocWrapper: {
    overflow: "auto",
    height: "550px"
  },
  pagewrapid: {
    width: "1570px",
    display: "flex",
    justifyContent: "space-around",
    border: "1px solid #7990A2",
    "border-radius": "5px"
  },
  metadata_flashactive: {
    alignSelf: "flex-start"
  },
  shadowBox1: {
    "border-radius": 0,
    padding: 0,
    margin: 0,
    border: 0
  },
  catalog_container: {
    height: "606px",
    margin: 0,
    padding: "25px",
    border: 0,
    "border-radius": 0,
    position: "relative"
  },
  bcv_next: {
    top: "-12%"
  },
  bcv_previous: {
    top: "-12%",
    right: "20px",
    left: "inherit"
  }
};

var percentage = document.createElement("div");
percentage.setAttribute("style", stylize("percentage"));
document.querySelector(".catalog_container").appendChild(percentage);

function rearrange() {
  return new Promise((resolve, reject) => {
    Array.from(document.querySelector("#pagewrapid").childNodes)
      .filter(
        child =>
          child.nodeName !== "INPUT" &&
          child.id !== "metadata_flashactive" &&
          child.className !== "catalog_container"
      )
      .forEach(selector => selector.remove());

    pagewrapid = document.querySelector("#pagewrapid");
    toc = document.querySelector(".videotoc");
    tocWrapper = document.createElement("div");
    tocWrapper.id = "tocWrapper";
    toc.parentNode.appendChild(tocWrapper);

    if (tocWrapperScrollEventAttached === false) attachTocWrapperScrollEvent();

    tocWrapper.appendChild(toc);
    tocWrapper.setAttribute("style", stylize("tocWrapper"));
    tocWrapper.scrollTop = tocWrapperScrollTop;
    pagewrapid.setAttribute("style", stylize("pagewrapid"));
    document
      .querySelector("#metadata_flashactive")
      .setAttribute("style", stylize("metadata_flashactive"));
    document
      .querySelector(".shadowBox1")
      .setAttribute("style", stylize("shadowBox1"));
    document
      .querySelector(".catalog_container")
      .setAttribute("style", stylize("catalog_container"));
    document
      .getElementById("bcv_next")
      .setAttribute("style", stylize("bcv_next"));
    document
      .getElementById("bcv_previous")
      .setAttribute("style", stylize("bcv_previous"));

    resolve();
  });
}

function attachTocWrapperScrollEvent() {
  tocWrapperScrollEventAttached = true;
  tocWrapper.onscroll = event => (tocWrapperScrollTop = event.target.scrollTop);
}

function keyEvents(event) {
  switch (event.key) {
    case ".":
      document.getElementById("bcv_next").click();
      break;
    case ",":
      document.getElementById("bcv_previous").click();
      break;
    case "ArrowUp":
      event.altKey
        ? sr
            .increment()
            .then(speed =>
              kdp.sendNotification("playbackRateChangeSpeed", speed)
            )
        : vr
            .increment()
            .then(volume => kdp.sendNotification("changeVolume", volume));
      break;
    case "ArrowDown":
      event.altKey
        ? sr
            .decrement()
            .then(speed =>
              kdp.sendNotification("playbackRateChangeSpeed", speed)
            )
        : vr
            .decrement()
            .then(volume => kdp.sendNotification("changeVolume", volume));
      break;
    case "ArrowRight":
      adjustTime("forward", event);
      break;
    case "ArrowLeft":
      adjustTime("backward", event);
      break;
    case " ":
      kdp.sendNotification(paused ? "doPlay" : "doPause");
      paused = !paused;
      break;
    case "0":
    case "1":
    case "2":
    case "3":
    case "4":
    case "5":
    case "6":
    case "7":
    case "8":
    case "9":
      adjustTime("headshot", event);
      break;
    default:
      break;
  }
}

class Range {
  constructor(value, minimum, maximum, interval) {
    this.value = value;
    this.minimum = minimum;
    this.maximum = maximum;
    this.interval = interval;
  }

  increment() {
    return new Promise((resolve, reject) => {
      var newValue = this.value + this.interval;
      this.value =
        newValue >= this.maximum ? this.maximum : parseFloat(newValue);
      resolve(this.value);
    });
  }

  decrement() {
    return new Promise((resolve, reject) => {
      var newValue = this.value - this.interval;
      this.value =
        newValue <= this.minimum ? this.minimum : parseFloat(newValue);
      resolve(this.value);
    });
  }
}

class VolumeRange extends Range {
  constructor() {
    super(1, 0.1, 1, 0.1);
  }
}

class SpeedRange extends Range {
  constructor() {
    super(1.25, 0.25, 2, 0.25);
  }
}

function stylize(id) {
  return Object.keys(styles[id])
    .reduce((cssText, key) => cssText.concat(`${key}:${styles[id][key]};`), [])
    .join("");
}

function adjustTime(transition, event) {
  var currentTime = kdp.evaluate("{video.player.currentTime}");
  var timeAdjustment =
    scrubInSeconds *
    (event.altKey ? altModifier : 1) *
    (event.shiftKey ? shiftModifier : 1);

  if (
    transition === "forward" &&
    currentTime + timeAdjustment < kdp.evaluate("{duration}")
  ) {
    kdp.sendNotification("doSeek", currentTime + timeAdjustment);
  }
  if (transition === "backward" && currentTime - timeAdjustment > 0) {
    kdp.sendNotification("doSeek", currentTime - timeAdjustment);
  }
  if (transition === "headshot") {
    kdp.sendNotification(
      "doSeek",
      parseInt(event.key) / 10 * kdp.evaluate("{duration}")
    );
  }
}

function saveBookmark() {
  new Promise((resolve, reject) => {
    localStorage.setItem(
      course_id,
      document.querySelector(".clipselected").dataset.clipRef
    );
    resolve();
  });
}

function loadBookmark() {
  var video_id = localStorage.getItem(course_id);
  if (video_id) {
    Array.from(document.querySelectorAll(".videotoc a"))
      .filter(a => a.dataset.clipRef === video_id)[0]
      .click();
    document.getElementById("tocWrapper").scrollTop = document.querySelector(
      ".clipselected"
    ).offsetParent.offsetTop;
  }
}

function calculateWatchedTime() {
  var totalTime = 0,
    watchedTime = 0;

  var selectedClipIndex = Array.from(document.querySelectorAll(".videotoc a"))
    .filter(a => a.dataset.clipRef)
    .map(a => a.className)
    .indexOf("clipselected");

  var spans = Array.from(document.querySelectorAll(".videotoc p span")).filter(
    span => {
      return span.parentElement.classList[1] === "time" && span.innerText;
    }
  );

  totalTime = collectTime(spans);

  spans.splice(selectedClipIndex);

  watchedTime = collectTime(spans);

  return `${Math.round(watchedTime / totalTime * 100)}%`;
}

function collectTime(spans) {
  var hour = 0,
    min = 0,
    second = 0;

  spans.forEach(span => {
    var chunks = span.innerText.split(":");
    hour += parseInt(chunks[0]);
    min += parseInt(chunks[1]);
    second += parseInt(chunks[2]);
  });

  return hour * 60 * 60 + min * 60 + second;
}

function setPercentage() {
  percentage.innerText = calculateWatchedTime();
}

kWidget.addReadyCallback(function(playerId) {
  kdp = document.getElementById(playerId);
  kdp.kBind("playerPlayEnd", function(data, id) {
    document.getElementById("bcv_next").click();
  });
});

let vr = new VolumeRange();
let sr = new SpeedRange();

document.addEventListener("keydown", keyEvents);
$(document).ajaxSuccess((event, xhr, settings) => {
  if (/ajaxtoc/.test(settings.url)) {
    rearrange()
      .then(saveBookmark)
      .then(setPercentage);
  }
});
$(document).ajaxSend(
  () => (tocWrapperScrollTop = document.getElementById("tocWrapper").scrollTop)
);

rearrange().then(loadBookmark);