optimized getModule, enabled modules from different YouTube UIDs

modulearn/src/App.svelte

@@ -1,33 +1,37 @@
 <script>
-  import Youtube from '@sveltecasts/svelte-youtube'
   import { onMount } from 'svelte';
 
   import Modules from './Modules.svelte'
+  import YouTube from './YouTube.svelte'
   import { position, currentModule } from './stores'
   import { getModule } from './utils'
-  import { kedro_modules } from './data'
+  import { modules } from './data'
 
-  let video; let interval; let timeout;
+  let video; let interval; let timeout; let uid = modules[0].uid;
-  $: _currentModule = $currentModule || kedro_modules[0]
+
+  $: if ($currentModule) uid = $currentModule.uid
 
   const positionUpdater = () => {
     interval = setInterval(() => {
       const pos = video.position()
-      const newModule = getModule(pos)
+      const newModule = getModule(pos, $currentModule)
       position.update(() => pos)
-        if ((newModule && !$currentModule) || (newModule && $currentModule && newModule.index !==
+        if ((newModule && !$currentModule) || (newModule && $currentModule && newModule.id !==
-            $currentModule.index)) { 
+            $currentModule.id)) { 
           currentModule.update(() => newModule) 
+          uid = newModule.uid
         }
     }, 100)
   }
 
   const onSelectModule = event => {
     const { module } = event.detail
-    if (module && !$currentModule || module.index !== $currentModule.index) {
+    if (module && !$currentModule || module.id !== $currentModule.id) {
       clearTimeout(timeout)
       clearInterval(interval)
       currentModule.update(() => module)
+      // TODO: make it change the uid successfully on the iframe!
+      //  possibly it's simplest to create a new iframe whenever you switch modules
       position.update(() => module.start)
       video.jumpTo(module.start)
       positionUpdater()
@@ -82,11 +86,11 @@
 
   const nextModule = () => {
     if (!$currentModule) {
-      return onSelectModule({detail: {module: kedro_modules[0]}})
+      return onSelectModule({detail: {module: modules[0]}})
     }
     const idx = $currentModule.index
-    if (idx < kedro_modules.length - 1) {
+    if (idx < modules.length - 1) {
-      const mod = kedro_modules[idx + 1]
+      const mod = modules[idx + 1]
       onSelectModule({detail: {module: mod}})
     }
   }
@@ -95,7 +99,7 @@
     if (!$currentModule) return
     const idx = $currentModule.index || 1
     if (idx > 0) {
-      const mod = kedro_modules[idx - 1]
+      const mod = modules[idx - 1]
       onSelectModule({detail: {module: mod}})
     }
   }
@@ -106,9 +110,14 @@
 <svelte:window on:keydown={handleKeyDown} />
 
 <main>
-  <Youtube bind:this={video} videoId={_currentModule.uid} />
+  {#key uid}
-  <Modules on:repositionInModule={onRepositionInModule} on:selectModule={onSelectModule}
+    <YouTube bind:this={video} videoId={uid} />
-      modules={kedro_modules} />
+  {/key}
+  <Modules 
+      on:repositionInModule={onRepositionInModule} 
+      on:selectModule={onSelectModule}
+      modules={modules} 
+  />
 </main>
 
 <style>

modulearn/src/Module.svelte

@@ -10,7 +10,7 @@
 
   let selected; let progress; let klass; let progressBar
 
-  $: selected = $currentModule && $currentModule.index === module.index
+  $: selected = $currentModule && $currentModule.id === module.id
   $: if (selected) {
       progress = getProgress($position)
       klass = "current"

modulearn/src/YouTube.svelte

@@ -0,0 +1,81 @@
+<script context="module">
+  let YouTubeIframeAPIReady = false
+</script>
+
+<script>
+  import { onMount, createEventDispatcher } from "svelte"
+  const dispatch = createEventDispatcher()
+
+  let divId = `player_${parseInt(Math.random() * 100000).toString()}`
+
+  export let videoId; export let height = "390"; export let width = "640"
+
+  let player;
+
+  onMount(() => {
+    const ytTagUrl = "https://www.youtube.com/iframe_api";
+    if (!isMyScriptLoaded(ytTagUrl)) {
+      // 2. This code loads the IFrame Player API code asynchronously.
+      const tag = document.createElement("script");
+      tag.src = ytTagUrl;
+      var firstScriptTag = document.getElementsByTagName("script")[0];
+      firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
+    }
+
+    window.onYouTubeIframeAPIReady = function() {
+      //console.log('hello')
+      window.dispatchEvent(new Event("YouTubeIframeAPIReady"));
+    };
+
+    window.addEventListener("YouTubeIframeAPIReady", function() {
+      if (YouTubeIframeAPIReady == false) {
+        // first load of an YT Video on this project
+        YouTubeIframeAPIReady = true; // now the Player can be created
+        createPlayer();
+      }
+   });
+    
+   function onPlayerStateChange({ data }) {		
+     dispatch("StateChange", data);		  
+   }
+    function createPlayer() {
+      player = new YT.Player(divId, {
+        height,
+        width,
+        videoId,
+        events: {
+          //'onReady': onPlayerReady,
+          onStateChange: onPlayerStateChange
+        }
+      });
+    }
+    if (YouTubeIframeAPIReady) {
+      createPlayer(); // if the YT Script is ready, we can create our player
+    }
+  });
+
+  function isMyScriptLoaded(url = "") {
+    var scripts = document.getElementsByTagName("script");
+    for (var i = scripts.length; i--; ) {
+      if (scripts[i].src == url) return true;
+    }
+    return false;
+  }
+
+  export function position() { return player.getCurrentTime() }
+  export function play() { player.playVideo() }
+  export function jumpTo(seconds) { player.seekTo(seconds) }
+  export function pause() { player.pauseVideo() }
+  export function paused() { return [5, 2, -1].includes(player.getPlayerState()) }
+  export function buffering() { return player.getPlayerState() === 3 }
+  export function state() { return player.getPlayerState() }
+</script>
+
+<span class="yt-component" style="float: left">
+  <div id={divId} />
+</span>
+<style>
+  .yt-component {
+    box-shadow: 15px 15px #111;
+  }
+</style>

modulearn/src/data.js

@@ -1,6 +1,17 @@
-const enrichObjects = (platform, uid, objects) => objects.map((object, index) => ({...{index, duration: object.end - object.start, uid, platform}, ...object}))
+const enrichObjects = (platform, uid, objects, startingIndex = 0) => objects.map((object, index) => (
+	{...{ 
+		index: index + startingIndex, 
+		duration: object.end - object.start, 
+		uid, 
+		platform,
+		id: `${uid}-${object.start}`,
+		isLast: index === objects.length - 1
+	}, 
+		...object}
+  )
+)
 
-export const kedro_modules = enrichObjects(
+const kedro_modules = enrichObjects(
   'YouTube',
   'ZPxuohy5SoU',
   [
@@ -56,3 +67,38 @@ export const kedro_modules = enrichObjects(
     },
   ]
 )
+
+const airflow_modules = enrichObjects(
+    'YouTube',
+    'AHMm1wfGuHE',
+    [
+      {
+        start: 0,
+        end: 17,
+        outcome: 'skip this part',
+      },
+      {
+        start: 17,
+        end: 388,
+        outcome: 'know what Airflow is',
+      },
+      {
+        start: 388,
+        end: 674,
+        outcome: 'see a demo of Airflow',
+      },
+      {
+        start: 674,
+        end: 852,
+        outcome: 'know what makes Airflow great',
+      },
+      {
+        start: 852,
+        end: 983,
+        outcome: 'know where Airflow fits into the hierarchy of data science',
+      },
+	],
+	kedro_modules.length,
+)
+
+export const modules = kedro_modules.concat(airflow_modules)

modulearn/src/utils.js

@@ -1,9 +1,21 @@
-import { kedro_modules } from './data'
+import { modules } from './data'
+
+export const getModule = (position, currentModule) => {
+  if (position < currentModule.end) {
+    return currentModule
+  }
+ 
+  for (const module of modules) {
+    if (module.index < currentModule.index) {
+       continue
+    }
+
+    if (currentModule.index - module.index > 1) {
+       continue
+    }
 
-export const getModule = position => {
-  for (const module of kedro_modules) {
     if (position > module.start && position < module.end) {
-      return module
+       return module
     }
   }
 }