(function () {
  function formatDateTime(value) {
    if (!value) return '暂无';
    const date = new Date(value);
    if (Number.isNaN(date.getTime())) return value;
    const pad = (number) => String(number).padStart(2, '0');
    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`;
  }

  function updateMqttStatus(status) {
    const root = document.getElementById('mqttStatus');
    const text = document.getElementById('mqttStatusText');
    if (!root || !text || !status) return;

    root.classList.toggle('connected', Boolean(status.connected));
    root.classList.toggle('disconnected', !status.connected);
    root.title = status.lastError || '';
    text.textContent = `MQTT ${status.connected ? '已连接' : (status.message || '未连接')}`;
  }

  function updateHomeStatus(data) {
    const summary = document.getElementById('lightSummary');
    if (summary && data.summary) {
      summary.textContent = `${data.summary.on} 组开启，${data.summary.off} 组关闭。`;
    }

    const nextOccurrence = document.getElementById('nextOccurrenceText');
    if (nextOccurrence) {
      nextOccurrence.textContent = data.nextOccurrence
        ? `下一次：${data.nextOccurrence.actionLabel}，${data.nextOccurrence.at}。`
        : '暂无后续计划。';
    }

    for (const state of data.states || []) {
      const card = document.querySelector(`[data-state-card="${state.channel}"]`);
      if (!card) continue;

      const value = card.querySelector('[data-state-value]');
      const lastSeen = card.querySelector('[data-last-seen]');
      if (value) {
        value.textContent = state.state;
        value.classList.remove('state-on', 'state-off', 'state-unknown');
        value.classList.add(`state-${String(state.state).toLowerCase()}`);
      }
      if (lastSeen) lastSeen.textContent = formatDateTime(state.last_seen_at);
    }
  }

  async function refreshStatus() {
    try {
      const response = await fetch('/api/status', { cache: 'no-store' });
      if (!response.ok) return;
      const data = await response.json();
      updateMqttStatus(data.mqttStatus);
      updateHomeStatus(data);
    } catch {
      updateMqttStatus({ connected: false, message: '刷新失败' });
    }
  }

  refreshStatus();
  setInterval(refreshStatus, 5000);
})();