import { isScheduleIntent, parseScheduleIntent } from '../../schedule-intent.mjs';

export async function handleWechatScheduleIntent({ intent, user, scheduleService }) {
  if (!scheduleService) return null;
  const scheduleIntent = parseScheduleIntent(intent.agentText);
  if (!isScheduleIntent(scheduleIntent)) return null;

  const timezone = process.env.H5_DEFAULT_TIMEZONE || 'Asia/Shanghai';

  if (scheduleIntent.action === 'create_todo') {
    if (scheduleIntent.needsClarification?.includes('todo_title')) {
      return '可以。你想让我记哪一条待办？例如“帮我记一下 跟段吃饭”。';
    }
    const item = await scheduleService.createItem({
      userId: user.userId,
      kind: 'task',
      title: scheduleIntent.title,
      timezone,
      sourceChannel: 'wechat',
      sourceMessageId: intent.msgId || null,
      sourceText: intent.agentText,
      metadata: {
        source: 'wechat_mp',
      },
    });
    return `已记录到待办列表：${item.title}，未设置提醒。`;
  }

  if (scheduleIntent.action === 'create_daily_todo_digest') {
    if (scheduleIntent.needsClarification?.includes('digest_time')) {
      return '可以。你想每天几点收到当天待办记录？比如“每天早上 7 点发给我”。';
    }
    const subscription = await scheduleService.createDailyTodoDigest({
      userId: user.userId,
      hour: scheduleIntent.hour,
      minute: scheduleIntent.minute,
      timezone,
      channel: 'wechat',
      sourceChannel: 'wechat',
      sourceMessageId: intent.msgId || null,
      sourceText: intent.agentText,
    });
    const minuteText = subscription.minute === 0 ? '' : `${String(subscription.minute).padStart(2, '0')}分`;
    return `已设置：我会每天早上 ${subscription.hour}点${minuteText} 通过服务号把当天待办记录发给你。`;
  }

  if (scheduleIntent.action === 'create_balance_alert') {
    if (scheduleIntent.needsClarification?.includes('threshold')) {
      return '可以。你想在余额低于多少时提醒我？例如“余额低于 20 元提醒我”。';
    }
    const subscription = await scheduleService.createBalanceLowAlert({
      userId: user.userId,
      thresholdCents: scheduleIntent.thresholdCents,
      channel: 'wechat',
      sourceChannel: 'wechat',
      sourceMessageId: intent.msgId || null,
      sourceText: intent.agentText,
    });
    return `已设置：当余额低于 ${(subscription.thresholdCents / 100).toFixed(2)} 元时，我会通过服务号提醒你。`;
  }

  if (scheduleIntent.action === 'query_schedule') {
    return scheduleService.buildTodoDigestText({
      userId: user.userId,
      timezone,
    });
  }

  return null;
}