// 云函数：unsubscribe
// 用户取消订阅，删除订阅记录
const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()

exports.main = async (event, context) => {
  const { OPENID } = cloud.getWXContext()

  try {
    const existing = await db.collection('subscriptions').where({
      openid: OPENID,
    }).get()

    if (existing.data.length > 0) {
      await db.collection('subscriptions').doc(existing.data[0]._id).remove()
    }

    return { success: true }
  } catch (err) {
    console.error('[unsubscribe] Error:', err)
    return { success: false, error: err.message }
  }
}