# 基于微信云开发构建小程序 Skill

// skills/todo-skill/index.js
wx.cloud.init({ env: 'your-env-xxxxxx' })

const skill = wx.modelContext.createSkill('skills/todo-skill')

// 添加待办：写操作走云函数（OPENID 由云开发自动注入，无需登录）
skill.registerAPI('addTodo', async ({ title }) => {
  if (!title) return { isError: true, content: [{ type: 'text', text: '缺少待办内容，请反问用户要记什么，禁止编造。' }] }

  const { result } = await wx.cloud.callFunction({ name: 'addTodo', data: { title } })
  return {
    content: [{ type: 'text', text: `已添加「${title}」，请展示最新待办清单卡片。` }],
    structuredContent: { todos: result.todos }
  }
})

// 查看待办：只读，直接连云数据库
skill.registerAPI('listTodos', async () => {
  const { data } = await wx.cloud.database().collection('todos').orderBy('createTime', 'desc').get()
  return {
    content: [{ type: 'text', text: `共 ${data.length} 条待办，请展示清单卡片，禁止纯文本罗列。` }],
    structuredContent: { todos: data.map(t => ({ todoId: t._id, title: t.title, done: t.done })) }
  }
})

// 完成待办：写操作走云函数
skill.registerAPI('completeTodo', async ({ todoId }) => {
  if (!todoId) return { isError: true, content: [{ type: 'text', text: 'todoId 须来自 listTodos 返回值，禁止编造。' }] }

  await wx.cloud.callFunction({ name: 'completeTodo', data: { todoId } })
  return { content: [{ type: 'text', text: '已标记完成，请刷新待办清单卡片。' }] }
})

module.exports = skill

// cloudfunctions/addTodo/index.js
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 title = String(event.title || '').slice(0, 100)   // 服务端二次校验
  if (!title) return { code: 1, msg: '内容为空' }

  await db.collection('todos').add({ data: { _openid: OPENID, title, done: false, createTime: db.serverDate() } })
  const { data } = await db.collection('todos').where({ _openid: OPENID }).orderBy('createTime', 'desc').get()
  return { code: 0, todos: data.map(t => ({ todoId: t._id, title: t.title, done: t.done })) }
}

// cloudfunctions/completeTodo/index.js
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()
  // where 同时带上 _openid，确保只能修改自己的待办（越权校验）
  await db.collection('todos').where({ _id: event.todoId, _openid: OPENID }).update({ data: { done: true } })
  return { code: 0 }
}

// skills/todo-skill/components/todo-card/index.js
Component({
  data: { todos: [] },
  lifetimes: {
    created() {
      this.ctx = wx.modelContext.getContext(this)
      this.ctx.on(wx.modelContext.NotificationType.Result, ({ result }) => {
        this.setData({ todos: (result.structuredContent || {}).todos || [] })
      })
    }
  },
  methods: {
    onTapTodo(e) {
      const { todoId, title } = e.currentTarget.dataset.todo
      this.ctx.sendFollowUpMessage({
        content: [
          { type: 'text', text: `完成「${title}」` },
          { type: 'api/call', data: { name: 'completeTodo', arguments: { todoId } } }
        ]
      })
    }
  }
})