104 lines
2.9 KiB
JavaScript
104 lines
2.9 KiB
JavaScript
const SLOTS = 5;
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import {known_load, known_save} from './known_instances.js';
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(function instance_buttons(){
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const container = document.querySelector('#mastodon_instance_buttons');
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const button_template = Function('first', 'instance',
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'return `' + document.querySelector('#instance_button_template').innerHTML + '`;');
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const another_button_template = Function(
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'return `' +
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document.querySelector('#another_instance_button_template').innerHTML + '`;');
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const top_instances =
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Function('return JSON.parse(`' + document.querySelector('#top_instances').innerHTML + '`);')();
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async function get_known(){
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let known = known_load();
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if(!known){
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let resp = await fetch('/api/known_instances');
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if(resp.ok && resp.headers.get('content-type') == 'application/json'){
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known = await resp.json();
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}
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else {
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known = [{
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"instance": "mastodon.social",
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"hits": 0
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}];
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}
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known_save(known)
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fetch('/api/known_instances', {method: 'DELETE'})
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}
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return known;
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}
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function normalize(known){
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/*
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move instances with the most hits to the top SLOTS slots,
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making sure not to reorder anything that is already there
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*/
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let head = known.slice(0, SLOTS);
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let tail = known.slice(SLOTS);
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if(tail.length == 0){
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return known;
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}
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for(let i = 0; i < SLOTS; i++){
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let head_min = head.reduce((acc, cur) => acc.hits < cur.hits ? acc : cur);
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let tail_max = tail.reduce((acc, cur) => acc.hits > cur.hits ? acc : cur);
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if(head_min.hits < tail_max.hits){
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// swappy
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let i = head.indexOf(head_min);
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let j = tail.indexOf(tail_max);
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let buf = head[i];
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head[i] = tail[j];
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tail[j] = buf;
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}
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}
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return head.concat(tail)
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}
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async function replace_buttons(){
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let known = await get_known();
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known = normalize(known);
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known_save(known);
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let filtered_top_instances = []
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for(let instance of top_instances){
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let found = false;
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for(let k of known){
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if(k['instance'] == instance){
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found = true;
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break;
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}
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}
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if(!found){
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filtered_top_instances.push(instance)
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}
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}
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let instances = known.concat(filtered_top_instances).slice(0, SLOTS);
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let html = '';
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let first = true;
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for(let instance of instances){
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html += button_template(first, instance['instance'])
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first = false;
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}
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html += another_button_template();
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container.innerHTML = html;
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}
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replace_buttons();
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})();
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