function createTodayTimer({ storage, getLogin, now = () => Date.now() }) {
  const key = () => {
    const login = String(getLogin?.() || '').trim().toLowerCase();
    return login ? 'stackchain.today-timer.v1.' + encodeURIComponent(login) : '';
  };
  const empty = () => ({ version:1, active_identity:'', entries:{} });
  const read = () => {
    const ownerKey = key();
    if (!ownerKey || !storage) return empty();
    try {
      const value = JSON.parse(storage.getItem(ownerKey) || 'null');
      if (value?.version !== 1 || typeof value.active_identity !== 'string' ||
          !value.entries || typeof value.entries !== 'object') return empty();
      return value;
    } catch (_error) {
      return empty();
    }
  };
  const write = state => {
    const ownerKey = key();
    if (!ownerKey || !storage) return false;
    try {
      storage.setItem(ownerKey, JSON.stringify(state));
      return true;
    } catch (_error) {
      return false;
    }
  };
  const settle = (state, at = now()) => {
    const entry = state.entries[state.active_identity];
    if (!entry?.running) return state;
    entry.elapsed_ms = Math.max(0, Number(entry.elapsed_ms) || 0) +
      Math.max(0, at - Number(entry.started_at ?? at));
    entry.started_at = null;
    entry.running = false;
    return state;
  };
  const snapshot = (identity = '') => {
    const state = read();
    const selected = identity || state.active_identity;
    const entry = state.entries[selected];
    if (!selected || !entry) return { identity:selected, elapsed_ms:0, running:false };
    const elapsed = Math.max(0, Number(entry.elapsed_ms) || 0) + (entry.running ?
      Math.max(0, now() - Number(entry.started_at ?? now())) : 0);
    return { identity:selected, elapsed_ms:elapsed, running:Boolean(entry.running) };
  };
  return {
    activate(identity) {
      if (!key() || typeof identity !== 'string' || !identity) return false;
      const state = read();
      if (state.active_identity === identity && state.entries[identity]?.running) return true;
      settle(state);
      state.active_identity = identity;
      const entry = state.entries[identity] || { elapsed_ms:0, started_at:null, running:false };
      entry.started_at = now();
      entry.running = true;
      state.entries[identity] = entry;
      return write(state);
    },
    pause() {
      const state = read();
      settle(state);
      return write(state);
    },
    resume() {
      const state = read();
      const entry = state.entries[state.active_identity];
      if (!entry) return false;
      if (!entry.running) {
        entry.started_at = now();
        entry.running = true;
      }
      return write(state);
    },
    stop() {
      const state = read();
      settle(state);
      return write(state);
    },
    recapEntries() {
      const state = read();
      settle(state);
      write(state);
      return Object.entries(state.entries).map(([identity, entry]) => ({
        identity,
        elapsed_ms:Math.max(0, Number(entry.elapsed_ms) || 0),
      })).filter(entry => entry.elapsed_ms > 0);
    },
    clearRecap() {
      return write(empty());
    },
    snapshot,
  };
}

function createTodayTimerView({ timer, isActive, queryAll, formatEstimate }) {
  let progress = null;
  let runway = null;
  const elapsed = milliseconds => {
    const seconds = Math.max(0, Math.floor(Number(milliseconds || 0) / 1000));
    const hours = Math.floor(seconds / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    const remainder = String(seconds % 60).padStart(2, '0');
    return hours ? hours + ':' + String(minutes).padStart(2, '0') + ':' + remainder : minutes + ':' + remainder;
  };
  const render = () => {
    if (!progress) return;
    const snapshot = timer.snapshot();
    const timing = isActive() && snapshot.identity ? ' · ' + elapsed(snapshot.elapsed_ms) +
      (runway?.current_minutes ? ' / ' + formatEstimate(runway.current_minutes) : '') : '';
    queryAll('[data-work-session-progress]').forEach(element => {
      element.textContent = 'Item ' + progress.index + ' of ' + progress.total + timing +
        (runway?.remaining_minutes ? ' · ' + formatEstimate(runway.remaining_minutes) + ' remaining' : '');
    });
    queryAll('[data-work-session-timer-toggle]').forEach(button => {
      button.hidden = !isActive();
      button.textContent = snapshot.running ? 'Pause timer' : 'Resume timer';
      button.setAttribute('aria-pressed', String(!snapshot.running));
    });
  };
  return {
    open(identity, active) { active ? timer.activate(identity) : timer.stop(); render(); },
    finish() { timer.stop(); progress = null; runway = null; },
    update(nextProgress, nextRunway) { progress = nextProgress; runway = nextRunway; render(); },
    reset() { progress = null; runway = null; },
    toggle() { const state = timer.snapshot(); state.running ? timer.pause() : timer.resume(); render(); },
    render,
  };
}

if (typeof module !== 'undefined' && module.exports) {
  createTodayTimer.createView = createTodayTimerView;
  module.exports = createTodayTimer;
}