// 云函数 getHistory — 遛狗历史列表（跨全部狗狗，附狗名）
// 供「遛狗历史」页与「记录」Tab 使用。
const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });
const db = cloud.database();

exports.main = async (event) => {
  const { OPENID } = cloud.getWXContext();
  const limit = Math.min(event.limit || 50, 100);

  // 狗名映射
  const dogsRes = await db.collection('dogs').where({ _openid: OPENID }).get();
  const nameMap = {};
  dogsRes.data.forEach((d) => { nameMap[d._id] = d.name; });

  const res = await db.collection('walks')
    .where({ _openid: OPENID })
    .orderBy('startAt', 'desc')
    .limit(limit)
    .get();

  const walks = res.data.map((w) => ({
    _id: w._id,
    dogIds: w.dogIds,
    dogNames: (w.dogIds || []).map((id) => nameMap[id] || '狗狗'),
    startAt: w.startAt,
    duration: w.duration,
    distance: w.distance,
    dogSteps: w.dogSteps,
    isManual: w.isManual,
    walkDate: w.walkDate,
  }));

  return { ok: true, data: { walks, total: walks.length } };
};