export const HEALTH_EVENT_NOTIFICATION_TYPES = Object.freeze({
  alert: 'health_event_alert',
  watch: 'health_event_watch',
});

export function shouldCreateWebNotification(severity) {
  return severity === 'watch' || severity === 'alert';
}

export function shouldAttemptWechatNotification(severity) {
  return severity === 'alert';
}

export function healthEventNotificationType(severity) {
  if (severity === 'alert') return HEALTH_EVENT_NOTIFICATION_TYPES.alert;
  if (severity === 'watch') return HEALTH_EVENT_NOTIFICATION_TYPES.watch;
  return null;
}

export function buildHealthEventNotificationCopy(event = {}) {
  const severity = String(event.severity ?? 'info');
  const message = String(event.message ?? event.agentSummary ?? '检测到新的健康变化').trim();
  if (severity === 'alert') {
    return {
      title: '健康提醒：需要关注',
      body: `${message}\n\n这不是医疗诊断。异常会记录在你的健康档案，并在你下次进入时优先展示。`,
    };
  }
  if (severity === 'watch') {
    return {
      title: '健康变化提示',
      body: `${message}\n\n建议继续按规范测量；如持续变化，可将趋势记录提供给医生评估。`,
    };
  }
  return {
    title: '健康记录更新',
    body: message,
  };
}

export function formatHealthAlertsPreamble(alerts = []) {
  if (!alerts.length) return '';
  const lines = [
    '【未读健康提醒】',
    '以下变化已记录在你的健康档案（不是医疗诊断）。请确认已知晓后再继续操作：',
    '',
  ];
  for (const alert of alerts.slice(0, 5)) {
    const prefix = alert.severity === 'alert' ? '⚠️' : '•';
    lines.push(`${prefix} ${alert.message ?? alert.agentSummary ?? '健康变化'}`);
  }
  if (alerts.length > 5) {
    lines.push(`… 另有 ${alerts.length - 5} 条提醒`);
  }
  lines.push('', '回复「知道了」确认已读；确认后才会显示功能菜单。');
  return lines.join('\n');
}

export function isHealthAlertsAckText(text = '') {
  const normalized = String(text ?? '').trim();
  return ['知道了', '已知悉', '确认', 'ok', 'OK', '好'].includes(normalized);
}