background.js

const API_KEY = config.API_KEY;
const SLIDES_DISCOVERY_DOCS = [
  "https://slides.googleapis.com/$discovery/rest?version=v1",
];
const DISCOVERY_DOCS = [
  "https://sheets.googleapis.com/$discovery/rest?version=v4",
];

var scontent = new Array();

function onGAPILoad() {
  gapi.client
    .init({
      // Don't pass client nor scope as these will init auth2, which we don't want
      apiKey: API_KEY,
      discoveryDocs: SLIDES_DISCOVERY_DOCS,
    })
    .then(
      function () {
        console.log("gapi initialized");
        chrome.identity.getAuthToken({ interactive: true }, function (token) {
          gapi.auth.setToken({
            access_token: token,
          });
        });
      },
      function (error) {
        console.log("error", error);
      }
    );
}

var currPresId = null;

// when url changes checks if presentation is same, if not get's info
function getPresData(pId) {
  if(currPresId != pId) {
    currPresId = pId;
    gapi.client.slides.presentations.get({
      presentationId: pId,
    }).then(function (response) {
      console.log(response.result.title);
      console.log(response.result.slides.length);
      getSlides(pId);
    })
  }
  else {
    console.log("presentation already loaded");
  }
}

// gets the id of each slide and prints to console, only used for new presentations
function getSlides(pId) {
  gapi.client.slides.presentations.get({
    presentationId: pId,
  }).then(function (response) {
    response.result.slides.forEach((slide) => {
      console.log(slide.objectId);
      var id = slide.objectId;
      var trigger = "next";

      var search_value = {};
      search_value[id] = trigger

      chrome.storage.local.get(search_value, function(result){
        var storage_value = {};
        storage_value[id] = result[id];
        chrome.storage.local.set(
          storage_value,
          ()=>{console.log("Storing trigger " + trigger + " for " + slide.objectId)
        });
      });
    })
  })
}

chrome.tabs.onUpdated.addListener(
  function(tabId, changeInfo, tab) {
    // read changeInfo data and do something with it
    // like send the new url to contentscripts.js
    if (changeInfo.url) {
      chrome.tabs.sendMessage( tabId, {
        message: 'urlChange',
        url: changeInfo.url
      })
      var urlInfo = changeInfo.url.split("/");
      console.log(urlInfo[5]);
      getPresData(urlInfo[5]);
      // var slideInfo = urlInfo[6].split(".");
      // getLastWord(urlInfo[5], slideInfo[1]);
      // console.log(slideInfo[1]);
    }
  }
);

function getLastWord(pId, sId) {
  var wordElements;
  gapi.client.slides.presentations.get({
    presentationId: pId,
    pageObjectId: sId,
  }).then(function (response) {
    response.pageElements.forEach((pageElement) => {
      if(pageElement.shape != undefined &&
        pageElement.shape.shapeType === "TEXT_BOX") {
          pageElement.shape.text.textElements.forEach((element) => {
            if(element.textRun != undefined &&
              element.textRun.content != " " &&
              element.textRun.content != "") {
                wordElements.push(element.textRun.content);
            }
          })
        }
    })
  })
  console.log(wordElements);
}

function getWord(pId,sId) {
  let textOnSlide = new Array;
  gapi.client.slides.presentations.get({
    presentationId: pId,
  }).then(function (response) {
    response.result.slides.forEach((slide) => {
      if(slide.objectId === sId) {
        slide.pageElements.forEach((pageElement) => {
          if(pageElement.shape != undefined && pageElement.shape.shapeType === "TEXT_BOX") {
            pageElement.shape.text.textElements.forEach((textElement) => {
              if(textElement.textRun != undefined) {
                textOnSlide.push(textElement.textRun.content.replace(/[^a-zA-Z ]/g, ""));
                var tst = textElement.textRun.content.replace(/[^a-zA-Z ]/g, "").split(" ");
                textOnSlide.push(tst[tst.length - 1]);
              }
            })
          }
        })
      }
    })
    var lastWord = textOnSlide[textOnSlide.length - 1];
    if(lastWord != null) {
      console.log(lastWord.toLowerCase());
    }
    else {
      console.log("next");
    }
  })
}