From d29ae8d3dcde3bed9e331960aae7509310d22981 Mon Sep 17 00:00:00 2001
From: Sam Carlton <sam@sam.lc>
Date: Sun, 27 Dec 2020 21:03:24 -0600
Subject: [PATCH] Add timestamps to player

---
 components/video/player.vue | 238 +++++++++++++++++++++++++++++++++++-
 1 file changed, 232 insertions(+), 6 deletions(-)

diff --git a/components/video/player.vue b/components/video/player.vue
index ae5eddd..b7a2bc9 100644
--- a/components/video/player.vue
+++ b/components/video/player.vue
@@ -6,33 +6,259 @@
             'margin-left': '-50vw',
             'margin-right': '-50vw'
         }"
-        class="video-canvas w-screen flex justify-center bg-black"
+        class="video-canvas w-screen flex flex-col justify-center items-center bg-black"
     >
         <div class="ratio-wrapper w-full max-w-4xl">
             <div class="relative overflow-hidden w-full pb-16/9">
                 <iframe
-                    :src="`https://www.youtube-nocookie.com/embed/${video.id}?autoplay=1&modestbranding=1&playsinline=1`"
-                    class="absolute h-full w-full object-cover"
+                    ref="frame"
+                    :id="frameId"
+                    :src="`https://www.youtube-nocookie.com/embed/${video.id}?enablejsapi=1&autoplay=1&modestbranding=1&playsinline=1`"
+                    class="absolute h-full w-full"
                     frameborder="0"
                     allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
                     allowfullscreen
                 />
             </div>
         </div>
+
+        <div
+            v-if="hasTimestamps && hasPlayer"
+            class="video-timestamps w-full max-w-4xl"
+        >
+            <div
+                ref="timestamps-scroll-container"
+                class="featured-apps overflow-x-auto overflow-y-visible whitespace-no-wrap py-2 space-x-2"
+            >
+                <button
+                    v-for="timestamp in timestamps"
+                    :key="timestamp.time"
+                    :ref="`timestamp-${timestamp.time}`"
+                    :data-time="timestamp.time"
+                    :class="[
+                        'inline-block text-xs rounded-lg py-1 px-2',
+                        'border-2 border-white focus:outline-none',
+                        (activeTimestamp && activeTimestamp.time === timestamp.time) ? 'border-opacity-100 bg-darkest' : 'border-opacity-0 neumorphic-shadow-inner'
+                    ]"
+                    :class-groups="{
+                        shadow: 'neumorphic-shadow-inner'
+                    }"
+                    @click.stop="seekTo(timestamp.inSeconds); player.playVideo()"
+                >{{ timestamp.fullText }}</button>
+            </div>
+
+            <!-- activeTimestamp: {{ activeTimestamp }} -->
+            <!-- playerTime: {{ playerTime }} -->
+        </div>
     </div>
 </template>
 
 <script>
+import LinkButton from '~/components/link-button.vue'
 
 export default {
-    // components: {
-    //     VideoCard
-    // },
+    components: {
+        LinkButton
+    },
     props: {
         video: {
             type: Object,
             required: true
         }
+    },
+    data: function () {
+        return {
+            player: null,
+            playing: false,
+            progressInterval: null,
+            playerTime: 0
+        }
+    },
+    computed: {
+        frameId () {
+            return `youtube-player-${this.video.id}-${this._uid}`
+        },
+        timestamps () {
+            return this.video.timestamps.map( timestamp => {
+                const [ minutes, seconds ] = timestamp.time.split(':')
+
+                return {
+                    ...timestamp,
+                    inSeconds: (minutes * 60) + Number(seconds)
+                }
+            })
+        },
+        hasTimestamps () {
+            return this.timestamps.length > 0
+        },
+        hasPlayer () {
+            return this.player !== null
+        },
+        activeTimestamp () {
+            const currentTime = this.playerTime// / 100
+
+            const reversesTimestamps = [
+                ...this.timestamps
+            ]
+
+            // reversesTimestamps.reverse()
+
+            let foundTimestamp = null
+
+            for (const timestamp of reversesTimestamps) {
+                const hasStarted = currentTime > 1
+                const currentTimeisAfterPreviousTimestamp = (foundTimestamp !== null) ? currentTime > foundTimestamp.inSeconds : true
+                // const isPastCurrentTime = currentTime > timestamp.inSeconds
+                // const isBeforeCurrentTime = currentTime > timestamp.inSeconds
+                const currentTimeIsBeforeThisTimestamp = currentTime < timestamp.inSeconds
+
+                if (currentTimeisAfterPreviousTimestamp && currentTimeIsBeforeThisTimestamp) {
+                    return foundTimestamp
+                }
+
+                foundTimestamp = timestamp
+            }
+
+            // No active timestamp
+            return null
+        }
+    },
+    watch: {
+        // whenever question changes, this function will run
+        activeTimestamp: function (newTimestamp, oldTimestamp) {
+
+            // console.log('newTimestamp', newTimestamp)
+            // console.log('oldTimestamp', oldTimestamp)
+
+            const hasOldAndNewTimestamps = newTimestamp !== null && oldTimestamp !== null
+
+            if (!hasOldAndNewTimestamps) return
+
+            if (newTimestamp.inSeconds !== oldTimestamp.inSeconds) {
+                this.scrollRow ( newTimestamp )
+            }
+        },
+
+        video () {
+            this.$nextTick(() => {
+                this.initializePlayer()
+            })
+        }
+    },
+    mounted () {
+        // Set frame ID here so that it's the same when Youtube API looks for it
+        // this.frameId = `youtube-bg-${this._uid}`
+
+        this.initializePlayer()
+    },
+    methods: {
+        scrollRow ( timestamp ) {
+
+            // If timestamp button doesn't exist
+            // then stop
+            if (!this.$refs[`timestamp-${timestamp.time}`]) return
+
+            const timestampsScroller = this.$refs['timestamps-scroll-container']
+            const [ timestampButton ] = this.$refs[`timestamp-${timestamp.time}`]
+
+            // https://stackoverflow.com/a/63773123/1397641
+            const newScrollPosition = timestampButton.offsetLeft - timestampsScroller.offsetLeft
+
+            timestampsScroller.scroll({ left: newScrollPosition, behavior: 'smooth' })
+        },
+        seekTo (timestampInSeconds) {
+            this.player.seekTo(timestampInSeconds)
+        },
+        async initializePlayer () {
+            // console.log('Youtube Embed API Ready')
+
+            // Clear player
+            this.player = null
+
+            // Clear tprogession interval
+            clearInterval(this.progressInterval)
+
+            // If there are no timestamps
+            // then stop
+            if (!this.hasTimestamps) return
+
+            if (typeof YT === 'undefined') {
+                await this.initializeApi()
+            }
+
+            const stateHandlers = {
+                // unstarted
+                '-1': () => null,
+                // ended
+                '0': () => null,
+                // playing
+                '1': this.onPlayerPlaying,
+                // paused
+                '2': this.onPlayerPaused,
+                // buffering
+                '3': () => null,
+                // video cued
+                '4': () => null,
+            }
+
+            // console.log('frame', this.$refs['frame'])
+            // console.log('frame id', this.$refs['frame'].id)
+
+            this.player = new YT.Player(this.$refs['frame'].id, {
+                events: {
+                    'onReady': this.onPlayerReady,
+                    'onStateChange': event => {
+                        // console.log('state changed', event)
+
+                        const stateHandler = stateHandlers[String(event.data)]
+                        // console.log('stateHandler', stateHandler)
+                        stateHandler(event)
+                    }
+                }
+            })
+        },
+        initializeApi () {
+            return new Promise( resolve => {
+                const tag = document.createElement('script')
+                tag.id = `youtube-api-script-${this._uid}`
+                tag.src = 'https://www.youtube.com/iframe_api'
+
+                const firstScriptTag = document.getElementsByTagName('script')[0]
+                firstScriptTag.parentNode.insertBefore(tag, firstScriptTag)
+
+
+                window.onYouTubeIframeAPIReady = resolve
+            })
+        },
+
+        onPlayerPlaying () {
+            console.log('Player playing')
+            this.playing = true
+
+            this.progressInterval = setInterval(() => {
+                // console.log('this.player.getCurrentTime()', this.player.getCurrentTime())
+
+                // If player is empty
+                // then stop
+                if (this.player === null) {
+                    clearInterval(this.progressInterval)
+                    return
+                }
+
+                // console.log('this.player', this.player.hasOwnProperty('getCurrentTime'))
+
+                this.playerTime = this.player.getCurrentTime()
+            }, 500)
+        },
+        onPlayerPaused () {
+            console.log('Player paused')
+            this.playing = false
+
+            clearInterval(this.progressInterval)
+        },
+        onPlayerReady (event) {
+            console.log('Player is ready', this.player)
+        }
     }
 }
 </script>