import { backfillProfile as apiBackfill } from './api.js'
const fieldUsage = require('./profile-field-usage.js')

/**
 * 就地补充 → 自动回写个人信息
 * @param {Object} opts
 *   targetType: 'user' | 'member'
 *   targetId:   memberId（targetType=member 时）
 *   fields:     { phone: '138...', birthday: '...' }
 *   scene:      'activity-signup'（必传，校验字段是否属于本场景）
 *   prevValues: { phone: '旧值' } 当前人已有值（用于「修改已有值」判定）
 * @returns {Promise<Object>} { updatedFields: [], skippedFields: [] }
 */
export function backfillProfile(opts) {
  return new Promise(function(resolve, reject) {
    var scene = opts.scene
    var fields = opts.fields || {}
    var fieldNames = Object.keys(fields)
    if (!scene || fieldNames.length === 0) {
      resolve({ updatedFields: [], skippedFields: fieldNames })
      return
    }

    // 1. 场景校验：只回写本场景登记过的字段
    var allowedFields = {}
    var skippedFields = []
    for (var i = 0; i < fieldNames.length; i++) {
      var name = fieldNames[i]
      var usage = fieldUsage[name]
      if (!usage) {
        skippedFields.push(name)
        continue
      }
      var inScene = false
      var targetsOk = false
      for (var j = 0; j < usage.scenes.length; j++) {
        var sc = usage.scenes[j]
        if (sc.scene === scene) {
          inScene = true
          if (sc.backfillTarget.indexOf(opts.targetType) >= 0) {
            targetsOk = true
          }
        }
      }
      if (inScene && targetsOk) {
        allowedFields[name] = fields[name]
      } else {
        skippedFields.push(name)
      }
    }

    if (Object.keys(allowedFields).length === 0) {
      resolve({ updatedFields: [], skippedFields: skippedFields })
      return
    }

    // 2. 修改已有值 → 弹确认
    var prev = opts.prevValues || {}
    var changedNames = []
    for (var k in allowedFields) {
      var oldVal = prev[k]
      var newVal = allowedFields[k]
      if (oldVal && oldVal !== newVal && !(newVal === '' && oldVal === newVal)) {
        changedNames.push(fieldUsage[k].label)
      }
    }

    function doBackfill() {
      apiBackfill({
        targetType: opts.targetType,
        targetId: opts.targetId || null,
        fields: allowedFields
      }).then(function(res) {
        if (res && res.code === 200) {
          // 3. 成功后更新本地缓存
          var profile = (res.data && res.data.profile) || {}
          if (opts.targetType === 'user') {
            var userInfo = uni.getStorageSync('userInfo') || {}
            for (var f in allowedFields) {
              if (profile[f] !== undefined) {
                userInfo[f] = profile[f]
              }
            }
            uni.setStorageSync('userInfo', userInfo)
          }
          resolve({
            updatedFields: (res.data && res.data.updatedFields) || [],
            skippedFields: skippedFields
          })
        } else {
          reject(new Error((res && res.message) || '回写失败'))
        }
      }).catch(function(err) {
        reject(err)
      })
    }

    if (changedNames.length > 0) {
      uni.showModal({
        title: '同步更新资料',
        content: '检测到您修改了' + changedNames.join('、') + '，是否同步更新' + (opts.targetType === 'member' ? '该家人的' : '您的') + '个人信息？',
        confirmText: '同步更新',
        cancelText: '仅本次使用',
        success: function(modalRes) {
          if (modalRes.confirm) {
            doBackfill()
          } else {
            resolve({ updatedFields: [], skippedFields: skippedFields })
          }
        }
      })
    } else {
      doBackfill()
    }
  })
}