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feedcycle.js
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2919 lines (2802 loc) · 131 KB
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/* Feed Cycle 2.0.1
Overview
--------
This file is an initial implementation of the version 2 single‑page application redesign.
It intentionally keeps the surface area small while establishing the new architectural
primitives so further features can “relax” into separate panels instead of competing for
simultaneous screen space.
Core Concepts Implemented
- Panel stack (lightweight) with back navigation + scroll restoration.
- Data (feeds/subscriptions + settings) persisted; article items kept ephemeral (runtime only).
- Basic feed refresh (direct fetch) supporting RSS & Atom (podcast enclosures TODO).
- OPML import/export + sample feed injection.
- Filter/Search panel (simple substring search currently) and infinite scroll batching.
- Media player toolbar scaffold (play/pause/progress + accessible draggable cue knob).
- Theme toggle (system / light / dark) using <html data-theme> attribute.
- Accessibility foundations: ARIA roles, keyboard for back, slider, and cards.
Deferred / Upcoming (to port / implement)
- Proxy & cache strategy + adaptive proxy ordering from v1 (CORS resilience).
- Rich search scoring (substring + regex + soundex + cosine) & token index.
- Virtualized window rendering for large article sets (v1 virtualization logic).
- Tags (future). Favourites + read-state now persisted (v2 scaffold increment).
- Media (audio/video) extraction & binding to central player (podcast + enclosure support).
- Advanced HTML sanitization / media safety utilities from v1.
- Rate limit awareness & scheduled refresh throttle respecting last download times.
- Scroll-into-position when filtering by subscription from an article view.
- Settings panes: About / Privacy / Licence content population (placeholders not yet added).
- Offline hydration using Cache API.
- Internationalization hooks & improved date formatting strategy.
Guiding Principles
- Small, explicit DOM + no framework; data driven via templates.
- Progressive enhancement: baseline works without advanced JS features.
- Accessibility over cleverness; semantic roles and keyboard parity.
- Local-first: keep user data (feeds & settings) in LocalStorage, large content ephemeral.
File Structure (v2 initial)
- feedcycle.html : Markup shells + <template> panels.
- feedcycle.css : Layout, themes, panel & media player styles.
- feedcycle.js : This scaffold (panels, state, fetching, minimal search, media player).
*/
(function(){
'use strict';
const VERSION = '2.0.3';
const LS_KEY = 'feedcycle-v2';
const DEBUG = false; // Set true for verbose console output
const DEFAULTS = { theme:'system', feeds:[], categories:[], lastFetch:{}, lastFetchUrl:{}, settings:{ refreshMinutes:30, cacheMaxAgeMinutes:60, corsProxy:'' }, read:{}, favorites:{}, tags:{}, autoTags:{}, proxyScores:{}, proxyScoresResetAt:0, feedRateLimits:{}, lastFetchAttempt:{}, feed404Counts:{} }; // posts ephemeral + tags mapping postId -> [tag]
// Quiet logging - only shows in console when DEBUG is true
const dbg = (...args) => { if(DEBUG) console.log('[FeedCycle]', ...args); };
// state will be loaded after proxy scoring utilities are defined
let state; // defer assignment
let posts = {}; // id -> post (ephemeral)
let lastFilteredPosts = [];
let lastRenderedCount = 0;
let pendingListRefresh = false;
let isInitialLoading = true; // true until first hydration/refresh completes
const INITIAL_RENDER_COUNT = 120;
const CACHE_MAX_AGE_DAYS = 30; // prune cache entries older than this
const CHUNK_SIZE = 120;
// ---------- Proxy & Caching (ported/minimal from v1) ----------
const PROXIES = [
// AllOrigins: use JSON endpoint (better CORS reliability) and unwrap via maybeExtractXmlFromJson
{ name: 'AllOrigins', kind: 'param-enc', base: 'https://api.allorigins.win/get?url=' },
{ name: 'corsproxy.io', kind: 'param-enc', base: 'https://corsproxy.io/?url=' },
{ name: 'CodeTabs', kind: 'param-enc', base: 'https://api.codetabs.com/v1/proxy?quest=' }
];
const proxyStats = new Map(); // name -> {success, fail, lastSuccess, lastFail, score}
const proxyTempDisabledUntil = new Map(); // name -> ts
const PROXY_DISABLE_MS = 10*60*1000;
const FETCH_TIMEOUT_MS = 12000;
const CACHE_NAME = 'feedcycle-cache-v2';
const RATE_LIMIT_BACKOFF_BASE_MS = 60*1000;
const RATE_LIMIT_BACKOFF_MAX_MS = 30*60*1000;
const feedRateLimit = new Map(); // feedId -> { attempt, until, delay }
function hydrateFeedRateLimitsFromState(){
if(!state?.feedRateLimits) return;
Object.entries(state.feedRateLimits).forEach(([fid, rec])=>{
if(!fid || !rec || typeof rec !== 'object') return;
if(feedRateLimit.has(fid)) return;
feedRateLimit.set(fid, { attempt: rec.attempt||0, until: rec.until||0, delay: rec.delay||0 });
});
}
// Enhanced proxy scoring with decay and weighted penalties
const PROXY_FAIL_WEIGHT = 3;
const PROXY_SUCCESS_WEIGHT = 1;
const PROXY_DECAY_MS = 30*60*1000; // 30 minutes
const PROXY_MIN_SAMPLE = 2; // dampen volatility for very small sample sizes
function recalcProxyScore(name){
const now = Date.now();
const s = proxyStats.get(name) || {success:0, fail:0, lastSuccess:0, lastFail:0, score:0};
const decay = (t)=> t? Math.exp(- (now - t) / PROXY_DECAY_MS) : 1;
const successW = s.success * decay(s.lastSuccess);
const failW = s.fail * decay(s.lastFail);
const raw = (successW * PROXY_SUCCESS_WEIGHT) - (failW * PROXY_FAIL_WEIGHT);
const attempts = s.success + s.fail;
const confidence = attempts < PROXY_MIN_SAMPLE ? 0.25 : 1;
s.score = raw * confidence;
proxyStats.set(name, s);
return s.score;
}
function recordProxyResult(name, ok){
if(!name) return;
const s = proxyStats.get(name) || {success:0, fail:0, lastSuccess:0, lastFail:0, score:0};
if(ok){ s.success += 1; s.lastSuccess = Date.now(); }
else { s.fail += 1; s.lastFail = Date.now(); }
proxyStats.set(name, s);
recalcProxyScore(name);
}
function proxyScore(p){ const s = proxyStats.get(p.name); return s? s.score||0 : 0; }
// Now that proxy machinery exists, load state (hydrating proxy stats) and maybe rebase
state = loadState();
function maybeRebaseProxyScores(){
try{
const NOW = Date.now();
const ONE_MONTH_MS = 30*24*60*60*1000; // approximate month
const last = state.proxyScoresResetAt || 0;
if(NOW - last < ONE_MONTH_MS) return; // not yet time
const names = PROXIES.map(p=>p.name);
names.forEach(n=>{ if(!proxyStats.has(n)) proxyStats.set(n,{success:0,fail:0,lastSuccess:0,lastFail:0,score:0}); recalcProxyScore(n); });
const ordered = names.map(n=>({name:n, s: proxyStats.get(n)||{}})).sort((a,b)=> (b.s.score||0) - (a.s.score||0));
const m = ordered.length || 1;
const now = Date.now();
ordered.forEach((entry, idx)=>{
const syntheticSuccess = (m - idx) + 1; // ensures descending, >=2 successes for top
const stats = { success: syntheticSuccess, fail:0, lastSuccess: now, lastFail:0, score:0 };
proxyStats.set(entry.name, stats);
recalcProxyScore(entry.name);
});
state.proxyScoresResetAt = NOW;
saveState();
dbg('Proxy scores rebased (monthly normalization)');
}catch(e){ dbg('Proxy score rebase skipped', e); }
}
maybeRebaseProxyScores();
function buildProxiedUrl(targetUrl, proxySpec){
if(typeof proxySpec === 'string'){
const p = proxySpec.trim();
if(!p) return targetUrl;
if(p.includes('%s')) return p.replace('%s', encodeURIComponent(targetUrl));
if(/[=]$/.test(p) || /[?&]url=$/i.test(p)) return p + encodeURIComponent(targetUrl);
return p + targetUrl;
}
const { kind, base, name } = proxySpec;
if(kind==='param-enc'){
let u = base + encodeURIComponent(targetUrl);
if(name==='AllOrigins') u += `&cache=${Date.now()}`; // bust any stale caching quirks
return u;
}
if(kind==='prefix'){
let clean = targetUrl;
if(!/^https?:/i.test(clean)){
try{ clean = new URL(clean, location.href).href; }catch{}
}
return base + clean.replace(/^https?:\/\//i, (match)=> match.toLowerCase() );
}
return targetUrl;
}
function getProxyCandidates(){
const manual = state.settings.corsProxy?.trim();
if(manual){
// When a manual proxy is configured, only use that (plus the direct fallback later)
return [manual];
}
const now = Date.now();
let active = PROXIES.filter(p=> !(proxyTempDisabledUntil.get(p.name)>now));
// If all public proxies are temporarily disabled, fall back to the full set instead of going direct.
if(!active.length) active = [...PROXIES];
// Ensure each has an initialized score object (prevents NaN sorting jitter)
for(const p of active){ if(!proxyStats.has(p.name)) proxyStats.set(p.name, {success:0,fail:0,lastSuccess:0,lastFail:0,score:0}); }
// Order by score (descending)
active.sort((a,b)=> proxyScore(b)-proxyScore(a));
return active;
}
async function fetchWithCache(url){
const maxAge = clamp((state.settings.cacheMaxAgeMinutes||60)*60*1000, 5*60*1000, 24*60*60*1000);
try{
if(typeof caches !== 'undefined'){
const cache = await caches.open(CACHE_NAME);
const req = new Request(url);
const hit = await cache.match(req);
if(hit){
const date = new Date(hit.headers.get('date')||0).getTime();
if(Date.now()-date < maxAge){ return hit.text(); }
}
const controller = new AbortController();
const to = setTimeout(()=> controller.abort(), FETCH_TIMEOUT_MS);
let res;
try{ res = await fetch(req, { signal: controller.signal }); }
finally{ clearTimeout(to); }
let text = '';
try{ text = await res.text(); }catch{}
if(res.ok){
const stored = new Response(text, { headers:{ 'content-type': res.headers.get('content-type')||'text/xml; charset=utf-8', 'date': new Date().toUTCString() }});
try{ await cache.put(req, stored); }catch{}
return text;
}
if(hit) return hit.text();
const snippet = (text||'').slice(0,240).replace(/\s+/g,' ').trim();
const detail = snippet ? ` (${snippet})` : '';
throw new Error(`HTTP ${res.status} ${res.statusText||''}${detail} @ ${url}`.trim());
}
}catch(e){ /* fall through to no-cache fetch below */ }
const controller = new AbortController();
const to = setTimeout(()=> controller.abort(), FETCH_TIMEOUT_MS);
let res; let text='';
try{ res = await fetch(url, { signal: controller.signal }); }
finally { clearTimeout(to); }
try{ text = await res.text(); }catch{}
if(!res.ok){
const snippet = (text||'').slice(0,240).replace(/\s+/g,' ').trim();
const detail = snippet ? ` (${snippet})` : '';
throw new Error(`HTTP ${res.status} ${res.statusText||''}${detail} @ ${url}`.trim());
}
return text;
}
function xmlHasParserError(xml){
try{ const doc = new DOMParser().parseFromString(xml,'text/xml'); return !!doc.querySelector('parsererror'); }catch{ return true; }
}
function maybeExtractXmlFromJson(text){
try{ const o = JSON.parse(text); if(o && typeof o.contents==='string') return o.contents; }catch{}
return null;
}
function addCacheBuster(u){ try{ return u + (u.includes('?')?'&':'?') + 't=' + Date.now(); }catch{ return u; } }
function getFeedRateLimit(feedId){
if(!feedId) return null;
const entry = feedRateLimit.get(feedId);
if(!entry) return null;
if(entry.until <= Date.now()){
feedRateLimit.delete(feedId);
if(state.feedRateLimits) delete state.feedRateLimits[feedId];
saveState();
return null;
}
return { ...entry, retryIn: Math.max(0, entry.until - Date.now()) };
}
function applyFeedRateLimit(feed){
const feedId = typeof feed === 'string' ? feed : feed?.id;
if(!feedId) return null;
const now = Date.now();
const existing = feedRateLimit.get(feedId);
let attempt = existing? existing.attempt : 0;
if(existing && existing.until <= now){ attempt = 0; }
attempt += 1;
const delay = Math.min(RATE_LIMIT_BACKOFF_BASE_MS * (2 ** (attempt - 1)), RATE_LIMIT_BACKOFF_MAX_MS);
const entry = { attempt, until: now + delay, delay };
feedRateLimit.set(feedId, entry);
state.feedRateLimits = state.feedRateLimits || {};
state.feedRateLimits[feedId] = entry;
state.lastFetchAttempt = state.lastFetchAttempt || {};
state.lastFetchAttempt[feedId] = now;
state.lastFetch[feedId] = now;
if(feed && typeof feed === 'object'){
const current = feed.refreshMinutes || state.settings.refreshMinutes || 30;
const nextMinutes = clamp(current + 5, 5, 24*60);
feed.refreshMinutes = nextMinutes;
}
saveState();
return { ...entry, retryIn: delay };
}
function clearFeedRateLimit(feedId){
if(!feedId) return;
let changed = false;
if(feedRateLimit.delete(feedId)) changed = true;
if(state.feedRateLimits && feedId in state.feedRateLimits){
delete state.feedRateLimits[feedId];
changed = true;
}
if(changed) saveState();
}
function isFeedEnabled(feed){ return feed?.enabled !== false; }
function resetFeed404(feedId){
if(!feedId) return;
if(state.feed404Counts && state.feed404Counts[feedId]){
delete state.feed404Counts[feedId];
saveState();
}
}
function incrementFeed404(feed){
const feedId = typeof feed==='string'? feed : feed?.id;
if(!feedId) return 0;
state.feed404Counts = state.feed404Counts || {};
const next = (state.feed404Counts[feedId]||0)+1;
state.feed404Counts[feedId] = next;
if(next >= 3){
const f = state.feeds.find(x=> x.id===feedId);
if(f){ f.enabled = false; }
}
saveState();
return next;
}
// ---------- Utilities ----------
const $ = sel=> document.querySelector(sel);
const byId = id=> document.getElementById(id);
const el = (tag, props={}, ...kids)=>{ const n=document.createElement(tag); for(const [k,v] of Object.entries(props)){ if(k==='class') n.className=v; else if(k==='html') n.innerHTML=v; else if(k.startsWith('on')&&typeof v==='function') n.addEventListener(k.substring(2),v); else if(v===true) n.setAttribute(k,''); else if(v!==false && v!=null) n.setAttribute(k,v);} for(const k of kids){ if(k==null) continue; if(Array.isArray(k)) n.append(...k); else if(k.nodeType) n.append(k); else n.append(String(k)); } return n; };
const SVG_NS = 'http://www.w3.org/2000/svg';
function svgIcon(useHref){
const svg = document.createElementNS(SVG_NS,'svg');
svg.setAttribute('class','icon');
svg.setAttribute('aria-hidden','true');
const use = document.createElementNS(SVG_NS,'use');
use.setAttribute('href', useHref);
svg.appendChild(use);
return svg;
}
const hashId = s=>{ let h=2166136261>>>0; for(let i=0;i<s.length;i++){ h^=s.charCodeAt(i); h=Math.imul(h,16777619);} return (h>>>0).toString(36); };
const clamp = (n,a,b)=> Math.max(a, Math.min(b,n));
function saveState(){
try{
// Serialize proxyStats lightweight: only keep scalar fields
if(proxyStats && typeof proxyStats.forEach==='function'){
const out = {};
proxyStats.forEach((v,k)=>{ out[k] = { success:v.success||0, fail:v.fail||0, lastSuccess:v.lastSuccess||0, lastFail:v.lastFail||0, score:v.score||0 }; });
state.proxyScores = out;
}
if(feedRateLimit && typeof feedRateLimit.forEach==='function'){
const out = {};
feedRateLimit.forEach((v,k)=>{ out[k] = { attempt:v.attempt||0, until:v.until||0, delay:v.delay||0 }; });
state.feedRateLimits = out;
}
state.lastFetchAttempt = state.lastFetchAttempt || {};
state.feed404Counts = state.feed404Counts || {};
localStorage.setItem(LS_KEY, JSON.stringify(state));
}catch(e){ console.warn('Save failed', e);} }
function loadState(){
try{
const raw = JSON.parse(localStorage.getItem(LS_KEY)||'{}');
const merged = Object.assign({}, DEFAULTS, raw);
// hydrate proxyStats
if(merged.proxyScores){
Object.entries(merged.proxyScores).forEach(([name, s])=>{
if(!s || typeof s !== 'object') return;
proxyStats.set(name, { success:s.success||0, fail:s.fail||0, lastSuccess:s.lastSuccess||0, lastFail:s.lastFail||0, score:s.score||0 });
});
}
if(merged.feedRateLimits){
Object.entries(merged.feedRateLimits).forEach(([fid, rec])=>{
if(!rec || typeof rec !== 'object') return;
feedRateLimit.set(fid, { attempt: rec.attempt||0, until: rec.until||0, delay: rec.delay||0 });
});
}
merged.lastFetchAttempt = merged.lastFetchAttempt || {};
merged.feed404Counts = merged.feed404Counts && typeof merged.feed404Counts==='object' ? merged.feed404Counts : {};
merged.feeds = (merged.feeds||[]).map(f=> ({ ...f, enabled: f?.enabled !== false }));
return merged;
}catch{ return {...DEFAULTS}; }
}
function applyTheme(){
document.documentElement.setAttribute('data-theme', state.theme||'system');
const btn = byId('btn-theme');
if(btn){
const use = btn.querySelector('#themeIconUse');
const map = { dark:'#i-moon', light:'#i-sun', system:'#i-auto' };
if(use) use.setAttribute('href', map[state.theme] || '#i-auto');
btn.title = `Theme: ${state.theme}`;
btn.setAttribute('aria-label', `Theme ${state.theme} (toggle)`);
}
}
// Set up accessible fullscreen toggle button and keep icon/labels in sync.
function setupFullscreenToggle(){
const btn = byId('btn-fullscreen');
if(!btn) return;
const iconUse = btn.querySelector('#fullscreenIconUse');
const getFullscreenElement = ()=> document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement;
const updateUi = ()=>{
const active = !!getFullscreenElement();
const label = active ? 'Exit fullscreen' : 'Enter fullscreen';
btn.setAttribute('aria-pressed', active ? 'true' : 'false');
btn.setAttribute('aria-label', label);
btn.title = label;
if(iconUse){ iconUse.setAttribute('href', active ? '#i-fullscreen-exit' : '#i-fullscreen'); }
};
const requestFullscreen = (target)=>{
if(!target) return;
const fn = target.requestFullscreen || target.webkitRequestFullscreen || target.mozRequestFullScreen || target.msRequestFullscreen;
if(typeof fn === 'function'){
try{
const result = fn.call(target);
if(result && typeof result.catch==='function'){ result.catch(()=>{}); }
}catch(e){ console.warn('Fullscreen request failed', e); }
}
};
const exitFullscreen = ()=>{
const fn = document.exitFullscreen || document.webkitExitFullscreen || document.mozCancelFullScreen || document.msExitFullscreen;
if(typeof fn === 'function'){
try{
const result = fn.call(document);
if(result && typeof result.catch==='function'){ result.catch(()=>{}); }
}catch(e){ console.warn('Fullscreen exit failed', e); }
}
};
btn.addEventListener('click', ()=>{
if(getFullscreenElement()){ exitFullscreen(); }
else { requestFullscreen(document.documentElement); }
});
['fullscreenchange','webkitfullscreenchange','mozfullscreenchange','MSFullscreenChange'].forEach(evt=> document.addEventListener(evt, updateUi));
['fullscreenerror','webkitfullscreenerror','mozfullscreenerror','MSFullscreenError'].forEach(evt=> document.addEventListener(evt, updateUi));
updateUi();
}
// ---------- Panel Stack ----------
const stackEl = byId('panel-stack');
const backStack = []; // {id, scroll, keep, el}
let suspendListRenders = false; // prevent list rerenders while viewing an article
function showPanel(id, opts={}){
const top = stackEl.lastElementChild;
const topId = top?.dataset.panel;
if(topId==='videoViewer' && id!=='videoViewer'){
cleanupActiveVideo();
}
if(id==='articleViewer' && top){
const scrollEl = top.querySelector('.panel-body');
backStack.push({ id: topId, scroll: scrollEl? scrollEl.scrollTop:0, keep:true, el: top });
// Keep list panel in DOM without layout shift
top.style.visibility='hidden';
top.setAttribute('aria-hidden','true');
suspendListRenders = (topId==='articlesInfiniteScrollable');
renderPanel(id, opts.data); focusPanel(id);
// Reset newly shown panel scroll
const nb = stackEl.lastElementChild?.querySelector('.panel-body'); if(nb) nb.scrollTop = 0;
if(nb) nb.focus?.();
} else if(id==='videoViewer' && topId==='articleViewer'){
const scrollEl = top.querySelector('.panel-body');
backStack.push({ id: topId, scroll: scrollEl? scrollEl.scrollTop:0, keep:true, el: top });
top.style.visibility='hidden';
top.setAttribute('aria-hidden','true');
renderPanel(id, opts.data); focusPanel(id);
const nb = stackEl.lastElementChild?.querySelector('.panel-body'); if(nb) nb.scrollTop = 0;
if(nb) nb.focus?.();
}else{
if(top){
const scrollEl = top.querySelector('.panel-body');
backStack.push({ id: topId, scroll: scrollEl? scrollEl.scrollTop:0 });
while(stackEl.firstChild){ stackEl.removeChild(stackEl.firstChild); }
}
renderPanel(id, opts.data); focusPanel(id);
const nb = stackEl.lastElementChild?.querySelector('.panel-body'); if(nb) nb.scrollTop = 0;
if(nb) nb.focus?.();
}
try{ const st = { panel:id, ts:Date.now() }; history.pushState(st, '', '#'+id); }catch{}
}
function back(){
if(!backStack.length) return;
const top = stackEl.lastElementChild;
if(top?.dataset.panel==='videoViewer'){
cleanupActiveVideo();
}
const prev = backStack.pop();
if(prev.keep && prev.el){
if(top && top!==prev.el) top.remove();
prev.el.style.visibility='';
prev.el.removeAttribute('aria-hidden');
let body = prev.el.querySelector('.panel-body');
const restoreScroll = ()=>{ if(body) body.scrollTop = prev.scroll||0; };
if(prev.id==='articlesInfiniteScrollable'){
suspendListRenders=false;
if(pendingListRefresh){
pendingListRefresh=false;
const desiredScroll = prev.scroll||0;
renderArticles();
body = prev.el.querySelector('.panel-body');
if(body) body.scrollTop = desiredScroll;
} else {
restoreScroll();
}
} else {
restoreScroll();
}
focusPanel(prev.id);
} else {
while(stackEl.firstChild){ stackEl.removeChild(stackEl.firstChild); }
renderPanel(prev.id);
const body = stackEl.lastElementChild?.querySelector('.panel-body'); if(body) body.scrollTop = prev.scroll||0;
focusPanel(prev.id);
}
}
function focusPanel(id){ const p = stackEl.querySelector(`[data-panel="${id}"]`); if(p){ const h = p.querySelector('.panel-bar h2, .panel-bar button.back-btn') || p; h.focus?.(); } }
function renderPanel(id, data){
const tpl = byId('tpl-'+ camelToKebab(id));
if(!tpl){ stackEl.append(el('div',{class:'panel empty','data-panel':id},`Unknown panel: ${id}`)); return; }
const frag = tpl.content.cloneNode(true);
const root = frag.querySelector('[data-panel]');
// Ensure a .panel-body exists for isolated scrolling
if(root && !root.querySelector('.panel-body')){
const body = el('div',{class:'panel-body'});
// Move all non panel-bar children into body
[...root.childNodes].forEach(n=>{
if(n.nodeType===1 && n.classList.contains('panel-bar')) return; // keep bar outside
if(n===body) return;
body.append(n);
});
root.append(body);
}
stackEl.append(root);
wirePanel(root, id, data);
}
function camelToKebab(s){ return s.replace(/[A-Z]/g,m=> '-'+m.toLowerCase()).replace(/^-/, ''); }
function wirePanel(root, id, data){
root.querySelectorAll('[data-action="back"]').forEach(btn=> btn.addEventListener('click', (e)=>{ e.preventDefault(); if(backStack.length){ history.back(); } else { back(); } }));
if(id==='settingsMain'){
root.querySelectorAll('[data-nav]').forEach(b=> b.addEventListener('click', ()=> showPanel(b.dataset.nav)));
}
if(id==='settingsSubscriptions'){
renderSubscriptionsList();
root.querySelector('[data-action="add-sub"]').addEventListener('click', ()=>{
const url = prompt('Feed URL (RSS/Atom):'); if(!url) return;
const f = { id: hashId(url), url, title: url, category:'' };
if(!state.feeds.find(x=>x.id===f.id)) state.feeds.push(f);
saveState(); renderSubscriptionsList();
});
}
if(id==='subscriptionEdit' && data){
renderSubscriptionEdit(data);
}
if(id==='settingsData'){
root.querySelector('[button][data-action]');
root.querySelectorAll('[data-action]').forEach(btn=>{
btn.addEventListener('click', ()=> handleDataAction(btn.dataset.action));
});
}
if(id==='settingsPreferences'){
const form = root.querySelector('#prefsForm');
const themeInputs = form.querySelectorAll('input[name="theme"]');
themeInputs.forEach(r=>{ r.checked = (state.theme||'system')===r.value; });
const refreshInput = form.querySelector('#globalRefreshInput');
const cacheInput = form.querySelector('#cacheMaxAgeInput');
const proxyInput = form.querySelector('#corsProxyInput');
refreshInput.value = state.settings.refreshMinutes || 30;
if(cacheInput) cacheInput.value = state.settings.cacheMaxAgeMinutes || 60;
if(proxyInput) proxyInput.value = state.settings.corsProxy || '';
form.addEventListener('submit', e=>{
e.preventDefault();
const selTheme = [...themeInputs].find(r=>r.checked)?.value||'system';
state.theme = selTheme; applyTheme();
const v = parseInt(refreshInput.value,10); if(!isNaN(v) && v>=5) state.settings.refreshMinutes = v;
if(cacheInput){ const c = parseInt(cacheInput.value,10); if(!isNaN(c) && c>=5) state.settings.cacheMaxAgeMinutes = c; }
if(proxyInput){ state.settings.corsProxy = proxyInput.value.trim(); }
saveState();
const status = form.querySelector('#prefsStatus'); if(status) status.textContent='Saved';
setTimeout(()=> back(), 300);
}, { once:true });
form.querySelector('[data-action="back"]').addEventListener('click', back, { once:true });
}
if(id==='filterAndSortSettings'){
const form = root.querySelector('#filterForm');
populateFilters(form);
form?.addEventListener('submit', e=>{
e.preventDefault();
applyFilterForm(form);
renderArticles();
if(backStack.length){ history.back(); } else back();
});
form?.querySelector('[data-action="reset"]')?.addEventListener('click', ()=>{
Object.assign(currentFilters, { ...FILTER_DEFAULTS, tagList: [] });
populateFilters(form);
renderArticles();
});
form?.querySelector('[data-action="cancel"]')?.addEventListener('click', ()=>{
populateFilters(form); // revert any unsaved edits
if(backStack.length){ history.back(); } else back();
});
}
if(id==='articlesInfiniteScrollable'){
renderArticles();
root.querySelector('[data-action="quick-refresh"]').onclick = ()=> refreshAll(true);
root.querySelector('[data-action="open-filter"]').onclick = ()=> showPanel('filterAndSortSettings');
setupInfiniteScroll(root);
}
if(id==='articleViewer' && data){ renderArticleViewer(data); }
if(id==='videoViewer' && data){ renderVideoViewer(data); }
}
// ---------- Filters ----------
const SORT_DEFAULT = 'published-desc';
const SORT_OPTIONS = new Set(['published-desc','published-asc','title-asc','title-desc','feed-asc','feed-desc','host-asc','host-desc','favorite','unread']);
const MEDIA_AUTO_TAGS = ['audio','video'];
const FILTER_DEFAULTS = Object.freeze({ q:'', subscription:'', category:'', tag:'', tagList:[], unread:false, fav:false, readState:'', dateFrom:'', dateTo:'', sort: SORT_DEFAULT });
const currentFilters = { ...FILTER_DEFAULTS, tagList: [] }; // mutable runtime copy
function populateFilters(form){
if(!form) return;
const selSub = form.querySelector('#filterSubscription');
const selCat = form.querySelector('#filterCategory');
const tagWrap = form.querySelector('#filterTagsWrap');
const feeds = state.feeds.slice().sort((a,b)=> (a.title||a.url||'').localeCompare(b.title||b.url||''));
if(selSub){
selSub.innerHTML = '<option value="">All subscriptions</option>' + feeds.map(f=> `<option value="${f.id}">${esc(f.title||f.url)}</option>`).join('');
selSub.value = currentFilters.subscription || '';
}
const cats = Array.from(new Set(state.feeds.map(f=> f.category).filter(Boolean))).sort((a,b)=> a.localeCompare(b));
if(selCat){
selCat.innerHTML = '<option value="">All categories</option>' + cats.map(c=> `<option>${esc(c)}</option>`).join('');
selCat.value = currentFilters.category || '';
}
if(tagWrap){
const allTags = Array.from(new Set(Object.values(state.tags||{}).flat()))
.map(t=> (t||'').trim())
.filter(Boolean)
.sort((a,b)=> a.localeCompare(b));
tagWrap.innerHTML='';
const baseSelections = Array.isArray(currentFilters.tagList) && currentFilters.tagList.length ? currentFilters.tagList : (currentFilters.tag? [currentFilters.tag]:[]);
const selected = new Set(baseSelections.map(t=> (t||'').trim()).filter(Boolean));
if(!allTags.length){
tagWrap.append(el('span',{class:'muted'},'No tags yet.'));
} else {
allTags.forEach(t=>{
const isSelected = selected.has(t);
const btn = el('button',{type:'button',class:'tag-toggle'+(isSelected?' is-selected':''), 'data-tag':t, 'aria-pressed':isSelected?'true':'false'}, t);
btn.addEventListener('click',()=>{
const active = !btn.classList.contains('is-selected');
btn.classList.toggle('is-selected', active);
btn.setAttribute('aria-pressed', active?'true':'false');
});
tagWrap.append(btn);
});
}
}
const sortSelect = form.querySelector('#filterSort');
if(sortSelect){
const value = SORT_OPTIONS.has(currentFilters.sort) ? currentFilters.sort : SORT_DEFAULT;
sortSelect.value = value;
}
const searchInput = form.querySelector('#filterSearch'); if(searchInput) searchInput.value = currentFilters.q || '';
const favOnly = form.querySelector('input[name="favOnly"]'); if(favOnly) favOnly.checked = !!currentFilters.fav;
const readStateInputs = form.querySelectorAll('input[name="readState"]');
const desired = currentFilters.readState ? currentFilters.readState : (currentFilters.unread? 'unread':'all');
readStateInputs.forEach(r=>{ r.checked = (r.value === (desired||'all')); });
const fromInput = form.querySelector('#filterDateFrom'); if(fromInput) fromInput.value = currentFilters.dateFrom || '';
const toInput = form.querySelector('#filterDateTo'); if(toInput) toInput.value = currentFilters.dateTo || '';
}
function applyFilterForm(form){
if(!form) return;
const data = new FormData(form);
const q = (data.get('q')||'').toString().trim();
const subscription = (data.get('subscription')||'').toString();
const category = (data.get('category')||'').toString();
const favOnlyInput = form.querySelector('input[name="favOnly"]');
const fav = !!(favOnlyInput && favOnlyInput.checked);
const readStateRaw = (data.get('readState')||'all').toString();
const readState = readStateRaw==='all'? '' : readStateRaw;
const unread = readState==='unread';
const tagWrap = form.querySelector('#filterTagsWrap');
const tagSelection = tagWrap ? [...tagWrap.querySelectorAll('.tag-toggle.is-selected')].map(btn=> (btn.dataset.tag||'').trim()).filter(Boolean) : [];
const tagList = Array.from(new Set(tagSelection));
const dateFrom = (data.get('dateFrom')||'').toString();
const dateTo = (data.get('dateTo')||'').toString();
const sortRaw = (data.get('sort')||SORT_DEFAULT).toString();
const sort = SORT_OPTIONS.has(sortRaw)? sortRaw : SORT_DEFAULT;
currentFilters.q = q;
currentFilters.subscription = subscription;
currentFilters.category = category;
currentFilters.fav = fav;
currentFilters.readState = readState;
currentFilters.unread = unread;
currentFilters.tagList = tagList;
currentFilters.tag = tagList.length===1 ? tagList[0] : '';
currentFilters.dateFrom = dateFrom;
currentFilters.dateTo = dateTo;
currentFilters.sort = sort;
}
function getFilteredPosts(){
const feedMap = new Map(state.feeds.map(f=> [f.id,f]));
const hostCache = new Map();
const getHost = (post)=>{
if(hostCache.has(post.id)) return hostCache.get(post.id);
const host = safeHost(post.link||'') || '';
hostCache.set(post.id, host);
return host;
};
const getFeedTitle = (feedId)=>{
const feed = feedMap.get(feedId);
return (feed?.title || feed?.url || '').trim();
};
const getPublishedTime = (post)=>{
const ts = new Date(post.published||post.updated||0).getTime();
return isNaN(ts)? 0 : ts;
};
const fallbackCompare = (a,b)=>{
const diff = getPublishedTime(b) - getPublishedTime(a);
if(diff) return diff;
const titleDiff = (a.title||'').localeCompare(b.title||'', undefined, { sensitivity:'base', numeric:true });
if(titleDiff) return titleDiff;
return (a.id||'').localeCompare(b.id||'');
};
let arr = Object.values(posts);
if(currentFilters.subscription){
arr = arr.filter(p=> p.feedId === currentFilters.subscription);
}
if(currentFilters.category){
arr = arr.filter(p=> (feedMap.get(p.feedId)?.category||'') === currentFilters.category);
}
if(currentFilters.unread){
arr = arr.filter(p=> !p.read);
}
if(currentFilters.fav){
arr = arr.filter(p=> p.favorite);
}
if(currentFilters.readState === 'read'){
arr = arr.filter(p=> p.read);
}
if(currentFilters.readState === 'unread'){
arr = arr.filter(p=> !p.read);
}
const tagList = (currentFilters.tagList&¤tFilters.tagList.length)? currentFilters.tagList : [];
if(tagList.length){
arr = arr.filter(p=>{
const tags = state.tags[p.id]||[];
return tagList.some(t=> tags.includes(t));
});
} else if(currentFilters.tag){
arr = arr.filter(p=> (state.tags[p.id]||[]).includes(currentFilters.tag));
}
const fromTime = currentFilters.dateFrom ? new Date(currentFilters.dateFrom).getTime() : NaN;
const toTime = currentFilters.dateTo ? new Date(currentFilters.dateTo).getTime() : NaN;
if(!isNaN(fromTime)){
arr = arr.filter(p=>{
const tp = new Date(p.published||p.updated||0).getTime();
return !isNaN(tp) && tp >= fromTime;
});
}
if(!isNaN(toTime)){
const inclusiveTo = toTime + 24*60*60*1000 - 1;
arr = arr.filter(p=>{
const tp = new Date(p.published||p.updated||0).getTime();
return !isNaN(tp) && tp <= inclusiveTo;
});
}
if(currentFilters.q){
const q = currentFilters.q.toLowerCase();
arr = arr.filter(p=> (p.title||'').toLowerCase().includes(q) || (p.summary||'').toLowerCase().includes(q));
}
const sortKey = SORT_OPTIONS.has(currentFilters.sort) ? currentFilters.sort : SORT_DEFAULT;
arr.sort((a,b)=>{
switch(sortKey){
case 'published-asc':{
const diff = getPublishedTime(a) - getPublishedTime(b);
if(diff) return diff;
break;
}
case 'title-asc':
case 'title-desc':{
const dir = sortKey==='title-asc'? 1 : -1;
const diff = (a.title||'').localeCompare(b.title||'', undefined, { sensitivity:'base', numeric:true });
if(diff) return dir * diff;
break;
}
case 'feed-asc':
case 'feed-desc':{
const dir = sortKey==='feed-asc'? 1 : -1;
const diff = getFeedTitle(a.feedId).localeCompare(getFeedTitle(b.feedId), undefined, { sensitivity:'base', numeric:true });
if(diff) return dir * diff;
break;
}
case 'host-asc':
case 'host-desc':{
const dir = sortKey==='host-asc'? 1 : -1;
const diff = getHost(a).localeCompare(getHost(b), undefined, { sensitivity:'base', numeric:true });
if(diff) return dir * diff;
break;
}
case 'favorite':{
const diff = Number(b.favorite) - Number(a.favorite);
if(diff) return diff;
break;
}
case 'unread':{
if(a.read !== b.read) return a.read ? 1 : -1;
break;
}
case 'published-desc':
default:
break;
}
return fallbackCompare(a,b);
});
return arr;
}
// ---------- Articles List ----------
function renderArticles(){
const panel = stackEl.querySelector('[data-panel="articlesInfiniteScrollable"]'); if(!panel) return;
const list = panel.querySelector('#articlesList'); if(!list) return;
const filtered = getFilteredPosts();
lastFilteredPosts = filtered;
const total = filtered.length;
const emptyMessage = isInitialLoading ? 'Loading articles…' : 'No articles match these filters.';
if(suspendListRenders){
pendingListRefresh = true;
lastRenderedCount = Math.min(lastRenderedCount, total);
if(total===0){
if(!list.querySelector('.empty')){
list.innerHTML='';
list.append(el('div',{class:'empty'}, emptyMessage));
}
}
return;
}
pendingListRefresh = false;
list.innerHTML='';
if(!total){
list.append(el('div',{class:'empty'}, emptyMessage));
lastRenderedCount = 0;
return;
}
lastRenderedCount = 0;
renderNextArticleChunk(list, INITIAL_RENDER_COUNT);
ensureArticleListFilled(list);
}
function renderNextArticleChunk(list, count=CHUNK_SIZE){
if(!lastFilteredPosts.length) return 0;
const start = lastRenderedCount;
const end = Math.min(lastFilteredPosts.length, start + count);
for(let i=start; i<end; i++){
list.append(articleCard(lastFilteredPosts[i]));
}
lastRenderedCount = end;
return end - start;
}
function ensureArticleListFilled(list){
const frame = list._scrollFrame;
if(!frame) return;
const threshold = frame.clientHeight + 400;
let guard = 16;
while(lastRenderedCount < lastFilteredPosts.length && frame.scrollHeight <= threshold && guard-- > 0){
if(!renderNextArticleChunk(list)) break;
}
}
function articleCard(p){
const isFav = !!p.favorite;
const classes = ['card', p.read? 'read':'unread'];
if(isFav) classes.push('favorite');
const c = el('div',{class:classes.join(' '), role:'article', tabindex:0, 'data-post-id':p.id, 'aria-label': (p.title||'Article') + (p.read? ' (read)':' (unread)')});
const favBtn = el('button',{class:'fav', type:'button', title: isFav? 'Remove favourite':'Add favourite', 'aria-label': isFav? 'Remove favourite':'Add favourite', 'aria-pressed': String(isFav), 'data-post-id': p.id}, isFav? '★':'☆');
favBtn.addEventListener('click', (e)=>{
e.stopPropagation();
toggleFavorite(p.id);
});
c.append(favBtn);
const realImg = pickImage(p);
const mw = el('div',{class:'card-media'});
if(realImg){
const im = el('img',{src:realImg, alt:'', loading:'lazy', decoding:'async', referrerpolicy:'no-referrer'});
im.addEventListener('error', ()=>{
if(im.dataset.fallback) return;
im.dataset.fallback='1';
const svg = generateInlinePlaceholderSVG(p);
if(svg){ mw.innerHTML = svg; }
else { im.src = onePixelPng(); }
});
mw.append(im);
} else {
// No sync image found, show placeholder initially
mw.innerHTML = generateInlinePlaceholderSVG(p) || `<img src="${onePixelPng()}" alt="" loading="lazy" decoding="async">`;
// Try async image loading for Open Graph fallback
pickImageAsync(p).then(asyncImg => {
if(asyncImg && asyncImg !== realImg) {
// Replace placeholder with async image
const newIm = el('img',{src:asyncImg, alt:'', loading:'lazy', decoding:'async', referrerpolicy:'no-referrer'});
newIm.addEventListener('error', ()=>{
if(newIm.dataset.fallback) return;
newIm.dataset.fallback='1';
const svg = generateInlinePlaceholderSVG(p);
if(svg){ mw.innerHTML = svg; }
else { newIm.src = onePixelPng(); }
});
mw.innerHTML = '';
mw.append(newIm);
}
}).catch(() => {
// Async loading failed, keep placeholder
});
}
c.append(mw);
c.append(el('h3',{}, p.title||'(untitled)'));
const chips = el('div',{class:'chips'});
p.read = true;
state.read[p.id]=true;
const feed = state.feeds.find(f=> f.id===p.feedId);
if(feed){
const feedChip = el('button',{class:'chip feed-chip', title:'Filter by subscription','aria-label':'Filter by '+(feed.title||feed.url), onclick:(e)=>{ e.stopPropagation(); currentFilters.subscription=feed.id; renderArticles(); }}, feed.title||feed.url);
chips.append(feedChip);
if(feed.category){ const catChip = el('button',{class:'chip cat-chip', title:'Filter by category','aria-label':'Filter by category '+feed.category, onclick:(e)=>{ e.stopPropagation(); currentFilters.category=feed.category; renderArticles(); }}, feed.category); chips.append(catChip); }
}
// Tag chips (existing)
const tagList = state.tags[p.id]||[];
if(tagList.length){
tagList.forEach(t=> chips.append(createTagFilterChip(t)));
}
// Read state chip
const readChip = el('button',{class:'chip read-chip', title:'Quick filter by read state', 'aria-label': p.read? 'Filter unread':'Filter read', onclick:(e)=>{ e.stopPropagation(); currentFilters.readState = p.read? 'unread':'read'; renderArticles(); }}, p.read? 'Read':'Unread');
chips.append(readChip);
if(chips.children.length) c.append(chips);
const host = safeHost(p.link||'');
c.append(el('div',{class:'meta'}, [host,' • ',fmtDate(p.published)]));
c.append(el('div',{class:'excerpt'}, p.summary||stripHtml(p.content||'').slice(0,180)));
c.onclick = ()=>{ openArticle(p); };
c.addEventListener('keydown', e=>{ if(e.key==='Enter'||e.key===' '){ e.preventDefault(); openArticle(p);} });
return c;
}
let lastArticlesScroll = 0;
function rememberArticlesScroll(){
const panel = stackEl.querySelector('[data-panel="articlesInfiniteScrollable"]');
if(panel){ const body = panel.querySelector('.panel-body'); if(body) lastArticlesScroll = body.scrollTop; }
}
function restoreArticlesScroll(){
const panel = stackEl.querySelector('[data-panel="articlesInfiniteScrollable"]');
if(panel){ const body = panel.querySelector('.panel-body'); if(body) body.scrollTop = lastArticlesScroll; }
}
function openArticle(p){
rememberArticlesScroll();
showPanel('articleViewer', { data: p });
requestAnimationFrame(()=>{ const pv = stackEl.querySelector('[data-panel="articleViewer"] .panel-body'); if(pv) pv.scrollTop = 0; });
}
function renderSubscriptionsList(){
const body = byId('subsBody'); if(!body) return; body.innerHTML='';
if(!state.feeds.length){ body.append(el('div',{class:'empty'},'No subscriptions yet. Use ＋ to add.')); return; }
const list = el('div',{class:'subs-list'});
state.feeds.sort((a,b)=> (a.category||'').localeCompare(b.category||'') || (a.title||'').localeCompare(b.title||'')).forEach(f=>{
const row = el('div',{class:'row'});
const titleBlock = el('strong',{}, f.title||f.url);
if(!isFeedEnabled(f)) titleBlock.append(el('span',{class:'muted', style:'margin-left:8px;'}, '(disabled)'));
const catLabel = el('span',{class:'muted'}, f.category? `(${f.category})`:'');
const actions = el('div',{class:'subs-actions'});
const editBtn = el('button',{title:'Edit subscription', 'aria-label':'Edit '+(f.title||f.url), onclick:()=>{ showPanel('subscriptionEdit', { data: f.id }); }}, 'Edit');
const delBtn = el('button',{title:'Remove subscription', 'aria-label':'Remove '+(f.title||f.url), onclick:()=>{ if(confirm('Remove this subscription?')){ removeSubscription(f.id); } }}, '🗑');
actions.append(editBtn, delBtn);
row.append(titleBlock, catLabel, actions);
list.append(row);
});
body.append(list);
}
function renderArticleViewer(p){
const body = byId('articleBody'); if(!body) return;
body.innerHTML='';
body.classList.add('article-viewer');
body.dataset.postId = p.id;
const feed = state.feeds.find(f=> f.id===p.feedId);
const heroUrl = pickImage(p);
const host = safeHost(p.link||'');
const published = fmtDate(p.published);
const publishedIso = (()=>{
const ts = Date.parse(p.published||'');
return isNaN(ts)? null : new Date(ts).toISOString();
})();
const readingStats = computeReadingStats(p);
const contextChips = el('div',{class:'chips article-context'}, []);
if(feed){
const feedChip = el('button',{class:'chip feed-chip', title:'Filter by subscription','aria-label':'Filter by '+(feed.title||feed.url), onclick:(e)=>{ e.stopPropagation(); currentFilters.subscription=feed.id; renderArticles(); }}, feed.title||feed.url);
contextChips.append(feedChip);
if(feed.category){
contextChips.append(el('button',{class:'chip cat-chip', title:'Filter by category','aria-label':'Filter by category '+feed.category, onclick:(e)=>{ e.stopPropagation(); currentFilters.category=feed.category; renderArticles(); }}, feed.category));
}
}
const readStateChip = el('button',{class:'chip read-chip', title:'Quick filter by read state','aria-label': p.read? 'Filter unread':'Filter read', onclick:(e)=>{ e.stopPropagation(); currentFilters.readState = p.read? 'unread':'read'; renderArticles(); }}, p.read? 'Read':'Unread');
contextChips.append(readStateChip);
const header = el('header',{class:'article-head'},[
contextChips,
el('h1',{class:'article-title', id:'articleViewerTitle'}, p.title||'(untitled)'),
el('div',{class:'article-meta'},[
published? el('span',{class:'meta-item'}, ['Published ', publishedIso? el('time',{datetime:publishedIso}, published) : published]) : null,
host? el('span',{class:'meta-item'}, ['Source ', host]) : null,
readingStats.minutes? el('span',{class:'meta-item'}, [`${readingStats.minutes} min read`, readingStats.words? ` • ${readingStats.words} words`:'' ]) : null
].filter(Boolean)),
(function(){
const actions = el('div',{class:'article-actions'});
const favBtn = el('button',{type:'button', class:'action-btn favorite-toggle', 'aria-pressed':'false', 'aria-label':'Add favourite', 'data-post-id':p.id});
const favIcon = svgIcon('#i-star');
const favLabel = el('span',{class:'favorite-toggle-label'},' Favourite');
favBtn.append(favIcon, favLabel);
favBtn.addEventListener('click', ()=>{
toggleFavorite(p.id);
syncArticleViewerFavoriteState(p.id);
});
actions.append(favBtn);
// compute a sensible original-article URL:
(function(){
let href = p.link || '';
// if no link or link is just a hash/empty, attempt to extract first anchor from content
try{
if(!href || href.trim()==='#' || href.trim()===''){
const dp = new DOMParser();
const doc = dp.parseFromString(p.content||'', 'text/html');
const a = doc.querySelector('a[href]');