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feat(web): uniform random asset selection in slideshow mode (#4953)

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* Implement weighted asset selection

* Rename totalAssets -> bucketCount

* Remove redundant check
This commit is contained in:
Sergey Kondrikov 2023-11-12 04:23:15 +03:00 committed by GitHub
parent 0bf55d8e32
commit 55e3605ca4
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1 changed files with 15 additions and 8 deletions
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23
web/src/lib/stores/assets.store.ts
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@ -32,6 +32,7 @@ export class AssetBucket {
*/
bucketHeight!: number;
bucketDate!: string;
bucketCount!: number;
assets!: AssetResponseDto[];
cancelToken!: AbortController | null;
position!: BucketPosition;
@ -158,6 +159,7 @@ export class AssetStore {
return {
bucketDate: bucket.timeBucket,
bucketHeight: height,
bucketCount: bucket.count,
assets: [],
cancelToken: null,
position: BucketPosition.Unknown,
@ -274,6 +276,7 @@ export class AssetStore {
bucket = {
bucketDate: timeBucket,
bucketHeight: THUMBNAIL_HEIGHT,
bucketCount: 0,
assets: [],
cancelToken: null,
position: BucketPosition.Unknown,
@ -313,16 +316,17 @@ export class AssetStore {
}
async getRandomAsset(): Promise<AssetResponseDto | null> {
const bucket = this.buckets[Math.floor(Math.random() * this.buckets.length)] || null;
if (!bucket) {
return null;
let index = Math.floor(Math.random() * this.buckets.reduce((acc, bucket) => acc + bucket.bucketCount, 0));
for (const bucket of this.buckets) {
if (index < bucket.bucketCount) {
await this.loadBucket(bucket.bucketDate, BucketPosition.Unknown);
return bucket.assets[index] || null;
}
index -= bucket.bucketCount;
}
if (bucket.assets.length === 0) {
await this.loadBucket(bucket.bucketDate, BucketPosition.Unknown);
}
return bucket.assets[Math.floor(Math.random() * bucket.assets.length)] || null;
return null;
}
updateAsset(_asset: AssetResponseDto, recalculate = false) {
@ -412,6 +416,9 @@ export class AssetStore {
const assetToBucket: Record<string, AssetLookup> = {};
for (let i = 0; i < this.buckets.length; i++) {
const bucket = this.buckets[i];
if (bucket.assets.length !== 0) {
bucket.bucketCount = bucket.assets.length;
}
for (let j = 0; j < bucket.assets.length; j++) {
const asset = bucket.assets[j];
assetToBucket[asset.id] = { bucket, bucketIndex: i, assetIndex: j };