photochamber-webserver/static/public/js/medias.js

class Media {
    constructor(data) {
        this.date = new Date(data.date);
        this.md5sum = data.md5sum;
        this.path = data.path;
        this.fileName = data.fileName;
        this.meta = data.meta || {};
        this.fixedTags = data.fixedTags || [];
        this.tags = data.tags || [];
        this.writeAccess = data.accessType === 2;
        this.thumbnail = `/api/media/thumbnail/${data.md5sum}.jpg`;
        this.original = `/api/media/original/${data.md5sum}`;
        this.ui = null;


        this.tags = this.tags.reduce((acc, tag) => { acc.add(tag.replaceAll(/\/\/+/gi, '/')); return acc; }, new Set());
        this.fixedTags = this.fixedTags.reduce((acc, tag) => { acc.add(tag.replaceAll(/\/\/+/gi, '/')); return acc; }, new Set());

        for (let i in this.meta) {
            if (this.meta[i].type === 'date')
                this.meta[i].value = new Date(parseInt(this.meta[i].value));
            else if (this.meta[i].type === 'number' || this.meta[i].type === 'octet')
                this.meta[i].value = parseInt(this.meta[i].value);
            else if (this.meta[i].type === 'string')
                this.meta[i].value = '' + this.meta[i].value;
        }
    }

    resize(maxWidth, maxHeight) {
        let ratio = Math.min(1, Math.max(
            maxWidth / (this.meta?.width || maxWidth),
            maxHeight / (this.meta?.height || maxHeight)));
        return {
            width: Math.floor(this.meta.width *ratio),
            height: Math.floor(this.meta.height *ratio),
        };
    }

    allTags() {
        return Array.from(new Set([...this.fixedTags, ...this.tags])).sort();
    }
}

function tryLoadMedia(md5sum) {
    return new Promise((ok, ko) => {
        $.get("/api/media/" +md5sum, data => {
            let item = new Media(data);
            MediaStorage.Instance.pushAll([item], true);
            ok(item);
        }).fail(err => {
            console.error("Trying to get media with md5sum " +md5sum +" failed:", err.responseText);
            ok(null);
        });
    });
}

class MediaStorage extends EventTarget
{
    constructor() {
        super();
        this.allMeta = {};
        this.allMetaTypes = {};
        this.allTags = new Set();
        this.medias = [];
        this.oldest = null;
        this.newest = null;
    }

    #pushMeta(metaKey, metaVal) {
        if (metaKey === 'dateTime')
            return;
        if (!this.allMeta[metaKey])
            this.allMeta[metaKey] = new Set();
        this.allMeta[metaKey].add(metaVal.value);
        if (!this.allMetaTypes[metaKey])
            this.allMetaTypes[metaKey] = { type: metaVal.type, canBeEmpty: !!this.medias.length };
    }

    #pushTag(tag, first) {
        while (tag.length && tag.endsWith('/'))
            tag = tag.substr(0, tag.length -1);
        this.allTags.add(tag);
        let index = tag.lastIndexOf('/');
        if (index >= 0)
            this.#pushTag(tag.substr(0, index));
    }

    #pushUnique(media) {
        for (let i of media.tags)
            this.#pushTag(i, true);
        for (let i of media.fixedTags)
            this.#pushTag(i, true);
        for (let key in media.meta)
            this.#pushMeta(key, media.meta[key]);
        for (let key in this.allMetaTypes)
            if (!media.meta[key])
                this.allMetaTypes[key].canBeEmpty = true;
        this.medias.push(media);
        media.md5sum === 'b1bc7614d67333cacb60af149ed5ee1f' && console.log(this);
    }

    pushAll(arr, partialLoad) {
        let result = [];
        let reorder = false;
        for (let i of arr) {
            if (partialLoad !== true) {
                this.oldest = !this.oldest || this.oldest.date.getTime() > i.date.getTime() ? i : this.oldest;
                this.newest = !this.newest || this.newest.date.getTime() < i.date.getTime() ? i : this.newest;
            }
            if (this.medias.length && this.medias[this.medias.length -1].date.getTime() < i.date.getTime())
                reorder = true;
            if (this.medias.find(x => x.md5sum === i.md5sum))
                continue;
            this.#pushUnique(i);
            result.push(i);
        }
        for (let i of result)
            this.dispatchEvent(new CustomEvent("newMedia", { detail: i }));
        if (reorder) {
            this.medias.sort((a, b) => b.date.getTime() - a.date.getTime());
            this.dispatchEvent(new CustomEvent("rebuildMedia"));
        }
    }

    onFilterUpdated() {
        this.dispatchEvent(new CustomEvent("rebuildMedia"));
    }

    getMediaIndex(media) {
        return this.medias.indexOf(media);
    }

    nextMedia(current) {
        return this.medias[this.getMediaIndex(current) +1];
    }

    previousMedia(current) {
        return this.medias[this.getMediaIndex(current) -1];
    }

    getMediaBetweenIndexes(a, b) {
        if (a > b)
            return this.getMediaBetweenIndexes(b, a);
        return this.medias.slice(a, b +1);
    }

    getMediaBetween(a, b) {
        let aIndex = this.medias.indexOf(a);
        let bIndex = this.medias.indexOf(b);
        if (aIndex < 0 || bIndex < 0 || aIndex === bIndex)
            return [];
        return this.getMediaBetweenIndexes(aIndex, bIndex);
    }

    async getMedia(md5sum) {
        let media = this.medias.find(x => x.md5sum === md5sum);
        if (media)
            return media;
        return await tryLoadMedia(md5sum);
    }
}

MediaStorage.Instance = new MediaStorage();