devdesk/web/src/sessions.js

// Sessions panel: server state (via `devdesk attach --list`) plus recently used
// sessions remembered in this browser.

import { fetchSessionList } from './connection.js';

const RECENTS_KEY = 'devdesk.recents';
const MAX_RECENTS = 12;

function readRecents() {
  try {
    const value = JSON.parse(localStorage.getItem(RECENTS_KEY) || '[]');
    return Array.isArray(value) ? value : [];
  } catch {
    return [];
  }
}

export function rememberSession(name) {
  if (!name) return;
  try {
    const recents = readRecents().filter((r) => r.name !== name);
    recents.unshift({ name, at: Date.now() });
    localStorage.setItem(RECENTS_KEY, JSON.stringify(recents.slice(0, MAX_RECENTS)));
  } catch {
    // Storage unavailable (private mode): recents are a convenience only.
  }
}

function ago(epochSeconds) {
  if (!epochSeconds) return '';
  const s = Math.max(0, Date.now() / 1000 - epochSeconds);
  if (s < 90) return 'now';
  if (s < 3600) return `${Math.floor(s / 60)}m`;
  if (s < 86400) return `${Math.floor(s / 3600)}h`;
  return `${Math.floor(s / 86400)}d`;
}

function el(tag, attrs = {}, ...children) {
  const node = document.createElement(tag);
  for (const [key, value] of Object.entries(attrs)) {
    if (key === 'class') node.className = value;
    else if (key.startsWith('on')) node.addEventListener(key.slice(2), value);
    else node.setAttribute(key, value);
  }
  node.append(...children.filter((c) => c !== null && c !== undefined));
  return node;
}

export class SessionsPanel {
  constructor({ list, select, openButton, refreshButton, pickerButton, status, onOpen, onPicker }) {
    Object.assign(this, { list, select, status, onOpen });
    this.current = null;
    this.data = null;
    refreshButton.addEventListener('click', () => this.refresh());
    pickerButton.addEventListener('click', () => onPicker());
    openButton.addEventListener('click', () => {
      if (select.value) onOpen(select.value);
    });
  }

  setCurrent(name) {
    this.current = name;
    if (this.data) this.render();
  }

  async refresh() {
    this.status.textContent = 'refreshing…';
    try {
      this.data = await fetchSessionList();
      this.status.textContent = '';
    } catch (err) {
      this.status.textContent = `list unavailable: ${err.message}`;
    }
    this.render();
  }

  render() {
    const sessions = this.data?.sessions ?? [];
    const known = new Set(sessions.map((s) => s.name));
    const recentsOnly = readRecents().filter((r) => !known.has(r.name)).slice(0, 5);
    this.list.replaceChildren();

    const ordered = [...sessions].sort((a, b) =>
      (b.running - a.running) || ((b.activity || 0) - (a.activity || 0)));
    for (const s of ordered) {
      const isCurrent = s.name === this.current;
      const meta = s.running
        ? `${s.attached} attached · ${ago(s.activity)}`
        : 'dormant · resumes Claude';
      this.list.append(el('li', { class: `dd-session-item${isCurrent ? ' is-current' : ''}` },
        el('button', {
          class: 'dd-session-open', type: 'button', title: s.dir || '',
          onclick: () => this.onOpen(s.name),
        },
        el('span', { class: `lt-dot ${s.running ? 'lt-dot-up' : 'lt-dot-idle'}` }),
        el('span', { class: 'dd-session-name' }, s.name),
        el('span', { class: 'dd-session-meta' }, meta)),
        el('a', {
          class: 'dd-session-tab', href: `?arg=${encodeURIComponent(s.name)}`,
          target: '_blank', rel: 'noopener', title: 'Open in a new tab', 'aria-label': `Open ${s.name} in a new tab`,
        }, '↗')));
    }
    for (const r of recentsOnly) {
      this.list.append(el('li', { class: 'dd-session-item is-recent' },
        el('button', { class: 'dd-session-open', type: 'button', onclick: () => this.onOpen(r.name) },
          el('span', { class: 'lt-dot lt-dot-idle' }),
          el('span', { class: 'dd-session-name' }, r.name),
          el('span', { class: 'dd-session-meta' }, 'recent'))));
    }
    if (!this.list.children.length) {
      this.list.append(el('li', { class: 'dd-empty' }, 'No sessions yet.'));
    }

    const projects = (this.data?.projects ?? []).filter((p) => !known.has(p.name));
    this.select.replaceChildren(el('option', { value: '' }, projects.length ? 'New session in…' : 'No other projects'));
    for (const p of projects) this.select.append(el('option', { value: p.name, title: p.dir }, p.name));
  }
}