class InfiniteScroller {
    getIDFromOffset;
    getHTMLFromID;
    destroyFromID;
    reachesBottom;
    minDist = 3000;
    maxDist = 8000;
    HTMLElements = [];
    div;
    scroll;
    constructor(getIDFromOffset, getHTMLFromID, destroyFromID, reachesBottom = () => { }) {
        this.getIDFromOffset = getIDFromOffset;
        this.getHTMLFromID = getHTMLFromID;
        this.destroyFromID = destroyFromID;
        this.reachesBottom = reachesBottom;
    }
    interval;
    getDiv(initialId, bottom = true) {
        const div = document.createElement("div");
        div.classList.add("messagecontainer");
        //div.classList.add("flexttb")
        const scroll = document.createElement("div");
        scroll.classList.add("flexttb", "scroller");
        div.append(scroll);
        this.div = div;
        this.interval = setInterval(this.updatestuff.bind(this), 100);
        this.scroll = scroll;
        this.scroll.addEventListener("scroll", this.watchForChange.bind(this));
        new ResizeObserver(this.watchForChange.bind(this)).observe(div);
        new ResizeObserver(this.watchForChange.bind(this)).observe(scroll);
        this.firstElement(initialId);
        this.updatestuff();
        this.watchForChange().then(_ => {
            this.scroll.scrollTop = this.scroll.scrollHeight;
        });
        return div;
    }
    scrollBottom;
    scrollTop;
    updatestuff() {
        this.scrollBottom = this.scroll.scrollHeight - this.scroll.scrollTop - this.scroll.clientHeight;
        this.scrollTop = this.scroll.scrollTop;
        if (this.scrollBottom) {
            this.reachesBottom();
        }
        //this.watchForChange();
    }
    firstElement(id) {
        const html = this.getHTMLFromID(id);
        this.scroll.append(html);
        this.HTMLElements.push([html, id]);
    }
    currrunning = false;
    async addedBottom() {
        this.updatestuff();
        const scrollBottom = this.scrollBottom;
        await this.watchForChange();
        if (scrollBottom < 30) {
            this.scroll.scrollTop = this.scroll.scrollHeight;
        }
    }
    async watchForChange() {
        if (this.currrunning) {
            return;
        }
        else {
            this.currrunning = true;
        }
        let again = false;
        if (!this.div) {
            this.currrunning = false;
            return;
        }
        /*
        if(this.scrollTop===0){
            this.scrollTop=10;
        }
        */
        if (this.scrollTop === 0) {
            this.scrollTop = 1;
            this.scroll.scrollTop = 1;
        }
        if (this.scrollTop < this.minDist) {
            const previd = this.HTMLElements.at(0)[1];
            const nextid = await this.getIDFromOffset(previd, 1);
            if (!nextid) {
            }
            else {
                again = true;
                const html = this.getHTMLFromID(nextid);
                this.scroll.prepend(html);
                this.HTMLElements.unshift([html, nextid]);
                this.scrollTop += 60;
            }
            ;
        }
        if (this.scrollTop > this.maxDist) {
            again = true;
            const html = this.HTMLElements.shift();
            await this.destroyFromID(html[1]);
            this.scrollTop -= 60;
        }
        const scrollBottom = this.scrollBottom;
        if (scrollBottom < this.minDist) {
            const previd = this.HTMLElements.at(-1)[1];
            const nextid = await this.getIDFromOffset(previd, -1);
            if (!nextid) {
            }
            else {
                again = true;
                const html = this.getHTMLFromID(nextid);
                this.scroll.append(html);
                this.HTMLElements.push([html, nextid]);
                this.scrollBottom += 60;
                if (scrollBottom < 30) {
                    this.scroll.scrollTop = this.scroll.scrollHeight;
                }
            }
            ;
        }
        if (scrollBottom > this.maxDist) {
            again = true;
            const html = this.HTMLElements.pop();
            await this.destroyFromID(html[1]);
            this.scrollBottom -= 60;
        }
        this.currrunning = false;
        if (again) {
            await this.watchForChange();
        }
        this.currrunning = false;
    }
    async delete() {
        for (const thing of this.HTMLElements) {
            await this.destroyFromID(thing[1]);
        }
        this.HTMLElements = [];
        clearInterval(this.interval);
        if (this.div) {
            this.div.remove();
        }
        this.scroll = null;
        this.div = null;
    }
}
export { InfiniteScroller };