From 00e24879b742e3517a64dda6e6b3224847a9e710 Mon Sep 17 00:00:00 2001
From: Wim Brand <wim@fornaxian.tech>
Date: Wed, 12 Mar 2025 17:44:18 +0100
Subject: [PATCH] Save video playback position in browser localstorage

---
 svelte/src/file_viewer/GalleryView.svelte   |  14 +++
 svelte/src/file_viewer/viewers/Video.svelte |   4 +-
 svelte/src/filesystem/viewers/Video.svelte  |   4 +-
 svelte/src/lib/VideoPosition.mts            | 101 ++++++++++++++++++++
 svelte/src/util/ProgressBar.svelte          |   6 +-
 5 files changed, 126 insertions(+), 3 deletions(-)
 create mode 100644 svelte/src/lib/VideoPosition.mts

diff --git a/svelte/src/file_viewer/GalleryView.svelte b/svelte/src/file_viewer/GalleryView.svelte
index 97efdd8..7418ea9 100644
--- a/svelte/src/file_viewer/GalleryView.svelte
+++ b/svelte/src/file_viewer/GalleryView.svelte
@@ -3,6 +3,8 @@ import { createEventDispatcher } from "svelte"
 import { flip } from "svelte/animate"
 import FilePicker from "./FilePicker.svelte"
 import { file_type } from "./FileUtilities.svelte";
+import { get_video_position } from "./../lib/VideoPosition.mjs"
+import ProgressBar from "./../util/ProgressBar.svelte"
 let dispatch = createEventDispatcher()
 
 export let list = {
@@ -112,6 +114,7 @@ const drop = (e, index) => {
 	{/if}
 
 	{#each list.files as file, index (file)}
+		{@const vp = get_video_position(file.id)}
 		<a
 			href="#item={index}"
 			class="file"
@@ -145,7 +148,13 @@ const drop = (e, index) => {
 						</button>
 					</div>
 				{/if}
+
+				{#if vp !== null}
+					<div class="grow"></div>
+					<ProgressBar no_margin used={vp.pos} total={vp.dur}/>
+				{/if}
 			</div>
+
 			{file.name}
 		</a>
 	{/each}
@@ -195,6 +204,8 @@ const drop = (e, index) => {
 	text-decoration: none;
 }
 .icon_container {
+	display: flex;
+	flex-direction: column;
 	margin: 3px;
 	height: 148px;
 	border-radius: 6px;
@@ -248,4 +259,7 @@ const drop = (e, index) => {
 	flex-direction: column;
 	justify-content: center;
 }
+.grow {
+	flex: 1 1 auto;
+}
 </style>
diff --git a/svelte/src/file_viewer/viewers/Video.svelte b/svelte/src/file_viewer/viewers/Video.svelte
index 22291f0..6b05bcc 100644
--- a/svelte/src/file_viewer/viewers/Video.svelte
+++ b/svelte/src/file_viewer/viewers/Video.svelte
@@ -1,5 +1,6 @@
 <script>
-import { onMount,  createEventDispatcher, tick } from "svelte";
+import { onMount, createEventDispatcher, tick } from "svelte";
+import { video_position } from "../../lib/VideoPosition.mjs";
 import BandwidthUsage from "./BandwidthUsage.svelte";
 import IconBlock from "../../layout/IconBlock.svelte";
 let dispatch = createEventDispatcher()
@@ -140,6 +141,7 @@ const video_keydown = e => {
 					on:play={() => playing = true }
 					on:ended={() => dispatch("next", {})}
 					on:keydown={video_keydown}
+					use:video_position={() => file.id}
 				>
 					<source src={file.get_href} type={file.mime_type} />
 				</video>
diff --git a/svelte/src/filesystem/viewers/Video.svelte b/svelte/src/filesystem/viewers/Video.svelte
index 2990589..09d5f20 100644
--- a/svelte/src/filesystem/viewers/Video.svelte
+++ b/svelte/src/filesystem/viewers/Video.svelte
@@ -1,5 +1,6 @@
 <script>
-import { onMount,  createEventDispatcher, tick } from "svelte";
+import { onMount, createEventDispatcher, tick } from "svelte";
+import { video_position } from "../../lib/VideoPosition.mjs";
 import { fs_path_url } from "../FilesystemAPI.mjs";
 let dispatch = createEventDispatcher()
 
@@ -107,6 +108,7 @@ const video_keydown = e => {
 					on:play={() => playing = true }
 					on:ended={() => dispatch("open_sibling", 1)}
 					on:keydown={video_keydown}
+					use:video_position={() => $nav.base.sha256_sum.substring(0, 8)}
 				>
 					<source src={fs_path_url($nav.base.path)} type={$nav.base.file_type} />
 				</video>
diff --git a/svelte/src/lib/VideoPosition.mts b/svelte/src/lib/VideoPosition.mts
new file mode 100644
index 0000000..844adb4
--- /dev/null
+++ b/svelte/src/lib/VideoPosition.mts
@@ -0,0 +1,101 @@
+
+type VideoPositions = {
+	[key: string]: VideoPosition
+}
+
+export type VideoPosition = {
+	time: number
+	pos: number
+	dur: number
+}
+
+const storage_key = "video_positions"
+const expiry_time = 28 * 24 * 60 * 60 * 1000
+
+let position_cache: VideoPositions | null = null
+export const get_video_positions = () => {
+	if (position_cache !== null) {
+		return position_cache
+	}
+
+	let video_positions = JSON.parse(window.localStorage.getItem(storage_key)) as VideoPositions
+	if (video_positions === null) {
+		return {} as VideoPositions
+	}
+	return video_positions
+}
+
+export const save_video_position = (id: string, position: number, duration: number) => {
+	const video_positions = get_video_positions()
+
+	// Add our new entry
+	video_positions[id] = {
+		time: (new Date).getTime(),
+		pos: position,
+		dur: duration,
+	}
+
+	// Remove old entries
+	const expiry_thresh = (new Date).getTime() - expiry_time
+	for (const key in video_positions) {
+		if (video_positions[key].time < expiry_thresh) {
+			delete video_positions[key]
+			console.debug("Delete old video position", key)
+		}
+	}
+
+	// Save updated object
+	window.localStorage.setItem(storage_key, JSON.stringify(video_positions))
+
+	// Update the cache
+	position_cache = video_positions
+}
+
+export const get_video_position = (id: string) => {
+	const video_positions = get_video_positions()
+	if (video_positions[id] === undefined) {
+		return null
+	}
+	return video_positions[id]
+}
+
+export const video_position = (node: HTMLVideoElement, get_id: () => string) => {
+	let last_time = 0
+
+	const loadeddata = (e: Event) => {
+		last_time = 0
+
+		const vp = get_video_position(get_id())
+		if (vp === null || vp.pos === 0 || vp.dur === 0) {
+			return
+		} else if (vp.pos / vp.dur > 0.95) {
+			// If the video is more than 95% complete we don't do anything
+			console.debug("Video is at end, not setting time")
+			return
+		}
+
+		(e.target as HTMLVideoElement).currentTime = vp.pos
+		last_time = vp.pos
+	}
+
+	const timeupdate = (e: Event) => {
+		const vid = (e.target as HTMLVideoElement)
+
+		// If the current timestamp is more than ten seconds off the last
+		// timestamp we saved, then we save the new timestamp
+		if (Math.abs(vid.currentTime - last_time) > 10) {
+			save_video_position(get_id(), vid.currentTime, vid.duration)
+			last_time = vid.currentTime
+		}
+	}
+
+	node.addEventListener("loadeddata", loadeddata)
+	node.addEventListener("timeupdate", timeupdate)
+
+	return {
+		destroy() {
+			node.removeEventListener("loadeddata", loadeddata)
+			node.removeEventListener("timeupdate", timeupdate)
+		}
+	}
+}
diff --git a/svelte/src/util/ProgressBar.svelte b/svelte/src/util/ProgressBar.svelte
index f75c367..82d9e02 100644
--- a/svelte/src/util/ProgressBar.svelte
+++ b/svelte/src/util/ProgressBar.svelte
@@ -4,6 +4,7 @@ export let used = 0
 export let animation = "ease"
 export let speed = 1000
 export let no_animation = false
+export let no_margin = false
 export let style = ""
 let percent = 0
 $: {
@@ -21,7 +22,7 @@ $: {
 }
 </script>
 
-<div class="progress_bar_outer" style={style}>
+<div class="progress_bar_outer" style={style} class:no_margin>
 	<div
 		class="progress_bar_inner"
 		class:no_animation
@@ -49,4 +50,7 @@ $: {
 .no_animation {
 	transition-property: none;
 }
+.no_margin {
+	margin: 0;
+}
 </style>