return-youtube-dislike/Extensions/firefox/script.js

function getButtons() {
  return document
    .getElementById("menu-container")
    ?.querySelector("#top-level-buttons-computed");
}

function getLikeButton() {
  return getButtons().children[0];
}

function getDislikeButton() {
  return getButtons().children[1];
}

function isVideoLiked() {
  return getLikeButton().classList.contains("style-default-active");
}

function isVideoDisliked() {
  return getDislikeButton().classList.contains("style-default-active");
}

function isVideoNotLiked() {
  return getLikeButton().classList.contains("style-text");
}

function isVideoNotDisliked() {
  return getDislikeButton().classList.contains("style-text");
}

function getState() {
  if (isVideoLiked()) {
    return "liked";
  }
  if (isVideoDisliked()) {
    return "disliked";
  }
  return "neutral";
}

function setLikes(likesCount) {
  getButtons().children[0].querySelector("#text").innerText = likesCount;
}

function setDislikes(dislikesCount) {
  getButtons().children[1].querySelector("#text").innerText = dislikesCount;
}

function setState() {
  browser.runtime.sendMessage(
    {
      message: "set_state",
      videoId: getVideoId(window.location.href),
      state: getState(),
    },
    function (response) {
      if (response != undefined) {
        const formattedDislike = numberFormat(response.dislikes);
        // setLikes(response.likes);
        console.log(response);
        setDislikes(formattedDislike);
        createRateBar(response.likes, response.dislikes);
      } else {
      }
    }
  );
}

function likeClicked() {
  // console.log("like" + getState());
  // setState();
}

function dislikeClicked() {
  // console.log("dislike" + getState());
  // setState();
}

function setInitalState() {
  setState();
  // setTimeout(() => sendVideoIds(), 1500);
}

function getVideoId(url) {
  const urlObject = new URL(url);
  const videoId = urlObject.searchParams.get("v");
  return videoId;
}

function isVideoLoaded() {
  const videoId = getVideoId(window.location.href);
  return (
    document.querySelector(`ytd-watch-flexy[video-id='${videoId}']`) !== null
  );
}

function numberFormat(numberState) {
  const userLocales = navigator.language;
  const formatter = Intl.NumberFormat(userLocales, { notation: "compact" });
  return formatter.format(numberState);
}

function setEventListeners(evt) {
  function checkForJS_Finish() {
    if (getButtons()?.offsetParent && isVideoLoaded()) {
      clearInterval(jsInitChecktimer);
      const buttons = getButtons();
      if (!window.returnDislikeButtonlistenersSet) {
        buttons.children[0].addEventListener("click", likeClicked);
        buttons.children[1].addEventListener("click", dislikeClicked);
        let lastKnownScrollPosition = 0;
        let ticking = false;
        // document.addEventListener('scroll', function(e) {
        //   lastKnownScrollPosition = window.scrollY;
        //
        //   if (!ticking) {
        //     window.requestAnimationFrame(function() {
        //       // sendVideoIds();
        //       ticking = false;
        //     });
        //
        //     ticking = true;
        //   }
        // });
        window.returnDislikeButtonlistenersSet = true;
      }
      setInitalState();
    }
  }

  if (window.location.href.indexOf("watch?") >= 0) {
    var jsInitChecktimer = setInterval(checkForJS_Finish, 111);
  }
}

function createRateBar(likes, dislikes) {
  var rateBar = document.getElementById(
    "return-youtube-dislike-bar-container"
  );
  const widthPx =
    getButtons().children[0].clientWidth +
    getButtons().children[1].clientWidth;

  const widthPercent =
    likes + dislikes > 0 ? (likes / (likes + dislikes)) * 100 : 50;

  if (!rateBar) {
    document.getElementById("menu-container").insertAdjacentHTML(
      "beforeend",
      `<div id="return-youtube-dislike-bar-container" 
                  style="width: ${widthPx}px; 
                  height: 3px; margin-left: 6px;">
                  <div id="return-youtube-dislike-bar" style="width: ${widthPercent}%; height: 100%" ></div>
                </div>`
    );
  } else {
    document.getElementById(
      "return-youtube-dislike-bar-container"
    ).style.width = widthPx + "px";
    document.getElementById("return-youtube-dislike-bar").style.width =
      widthPercent + "%";
  }
}

// function sendVideoIds() {
//   const ids = Array.from(
//     document.getElementsByClassName(
//       "yt-simple-endpoint ytd-compact-video-renderer"
//     )
//   )
//   .concat(
//     Array.from(
//       document.getElementsByClassName("yt-simple-endpoint ytd-thumbnail")
//     )
//   )
//   .filter((x) => x.href && x.href.indexOf("/watch?v=") > 0)
//   .map((x) => getVideoId(x.href));
//   browser.runtime.sendMessage({
//     message: "send_links",
//     videoIds: ids,
//   });
// }

setEventListeners();

// document.addEventListener("yt-navigate-finish", function (event) {
//   if (jsInitChecktimer !== null) clearInterval(jsInitChecktimer);
//   window.returnDislikeButtonlistenersSet = false;
//   setEventListeners();
// });




// window.onscrollend = () => {
//   sendVideoIds();
// };
//
// setTimeout(() => sendVideoIds(), 1500);

//window.addEventListener("hashchange", setEventListeners, false);