// pages/mine/addressedit.js
const API = require('../../utils/api.js')

Page({
  data: {
    addresses: [],
    editData: {
      _index: -1,
      label: '',
      province: '',
      city: '',
      district: '',
      address: '',
      postcode: '',
      isDefault: false
    },
    isEditing: false
  },

  onLoad() {
    this.initAddressData()
  },

  // 列表初值取自全局用户对象；「我的」页不再持有地址，本页是唯一入口
  initAddressData() {
    const app = getApp()
    const user = app.globalData.user || {}
    const addresses = user.addresses || []
    this.setData({
      // 深拷一份，编辑过程中不污染全局对象，落库成功后才回写
      addresses: addresses.map(item => ({ ...item })),
      isEditing: false,
      editData: this.emptyEditData()
    })
  },

  emptyEditData() {
    return {
      _index: -1,
      label: '',
      province: '',
      city: '',
      district: '',
      address: '',
      postcode: '',
      isDefault: false
    }
  },

  onAddAddress() {
    this.setData({
      isEditing: true,
      // 第一条地址自动设为默认，免得多一步勾选
      editData: { ...this.emptyEditData(), isDefault: this.data.addresses.length === 0 }
    })
    wx.setNavigationBarTitle({ title: '新增地址' })
  },

  onEditAddress(e) {
    const index = e.currentTarget.dataset.index
    const item = this.data.addresses[index]
    this.setData({
      isEditing: true,
      editData: {
        _index: index,
        label: item.label || '',
        province: item.province || '',
        city: item.city || '',
        district: item.district || '',
        address: item.address || '',
        // 本页没有邮编输入项，但要原样带过去，避免编辑一次就把它清掉
        postcode: item.postcode || '',
        isDefault: item.isDefault || false
      }
    })
    wx.setNavigationBarTitle({ title: '编辑地址' })
  },

  onBackToList() {
    this.setData({
      isEditing: false,
      editData: this.emptyEditData()
    })
    wx.setNavigationBarTitle({ title: '邮寄地址' })
  },

  onDeleteAddress(e) {
    const index = e.currentTarget.dataset.index
    wx.showModal({
      title: '提示',
      content: '确定删除该地址吗？',
      success: (res) => {
        if (!res.confirm) return
        const addresses = this.data.addresses.slice()
        addresses.splice(index, 1)
        // 删掉的是默认地址时顺位补一个，保证列表里始终有默认
        if (addresses.length > 0 && !addresses.some(a => a.isDefault)) {
          addresses[0].isDefault = true
        }
        this.setData({ addresses })
        this.persist(addresses)
      }
    })
  },

  onSetDefault(e) {
    const index = e.currentTarget.dataset.index
    const addresses = this.data.addresses.map((item, i) => ({
      ...item,
      isDefault: i === index
    }))
    this.setData({ addresses })
    this.persist(addresses)
  },

  onRegionChange(e) {
    const region = e.detail.value
    this.setData({
      'editData.province': region[0] || '',
      'editData.city': region[1] || '',
      'editData.district': region[2] || ''
    })
  },

  onFieldInput(e) {
    const field = e.currentTarget.dataset.field
    this.setData({
      [`editData.${field}`]: e.detail.value
    })
  },

  onDefaultChange(e) {
    this.setData({
      'editData.isDefault': e.detail.value
    })
  },

  onSaveEdit() {
    const editData = this.data.editData
    if (!editData.label.trim()) {
      wx.showToast({ title: '请输入地址标签', icon: 'none' })
      return
    }
    if (!editData.province || !editData.city || !editData.district) {
      wx.showToast({ title: '请选择所在地区', icon: 'none' })
      return
    }
    if (!editData.address.trim()) {
      wx.showToast({ title: '请输入详细地址', icon: 'none' })
      return
    }

    const addresses = this.data.addresses.slice()
    const newItem = {
      label: editData.label.trim(),
      province: editData.province,
      city: editData.city,
      district: editData.district,
      address: editData.address.trim(),
      postcode: editData.postcode.trim(),
      isDefault: editData.isDefault
    }

    if (editData.isDefault) {
      addresses.forEach(item => { item.isDefault = false })
    }

    if (editData._index >= 0) {
      addresses[editData._index] = newItem
    } else {
      if (addresses.length === 0) {
        newItem.isDefault = true
      }
      addresses.push(newItem)
    }

    this.setData({ addresses })
    this.onBackToList()
    this.persist(addresses)
  },

  // 地址是即时生效的（删除 / 设默认 / 表单保存都直接落库），
  // 成功后回写全局对象：「我的」页与下单页读的都是它
  persist(addresses) {
    const app = getApp()
    const user = app.globalData.user

    if (!user || !user._id) {
      wx.showToast({ title: '请先登录', icon: 'none' })
      return
    }

    wx.showLoading({ title: '保存中...' })

    API.user.update({
        _id: user._id,
        addresses
      })
      .then((data) => {
        if (data.code === 0) {
          // 与 profileedit 同一处坑：/user/update 的响应不含 security.token，
          // 整替会抹掉本机 token，security 必须保留本地那份
          app.globalData.user = { ...user, ...data.data.user, security: user.security || {} }
          wx.showToast({ title: '保存成功', icon: 'success' })
        } else {
          wx.showToast({ title: data.msg || '保存失败', icon: 'none' })
        }
      })
      .catch(() => {
        wx.showToast({ title: '网络请求失败', icon: 'none' })
      })
      .finally(() => {
        wx.hideLoading()
      })
  }
})