import {
  camelize
} from 'uni-shared'

const components = ['SystemAsyncLoading', 'SystemAsyncError']
export function isPage (vm) {
  if (vm.$parent && vm.$parent.$options.name === 'PageBody') {
    if (components.indexOf(vm.$options.name) !== -1) {
      return false
    }
    return true
  }
  return false
}

export function hasLifecycleHook (vueOptions = {}, hook) {
  return Array.isArray(vueOptions[hook]) && vueOptions[hook].length
}

export function normalizeDataset (dataset = {}) {
  // ios8.x,9.x Object.assign({},dataset) 始终返回 {}
  // http://ask.dcloud.net.cn/question/70246
  const result = JSON.parse(JSON.stringify(dataset))
  if (__PLATFORM__ === 'h5') {
    const keys = Object.keys(result)
    const len = keys.length
    if (len) {
      // remove data-v-
      for (let i = 0; i < len; i++) {
        const key = keys[i]
        const len = key.length
        if (key.substr(0, 1) === 'v' && (len === 9 || len === 10)) {
          delete result[key]
        }
      }
    }
  }
  return result
}

export function getTargetDataset (target) {
  let dataset = {}
  const vm = target.__vue__
  function updateDataset (vm, force) {
    const $attrs = vm.$attrs
    for (const key in $attrs) {
      if (key.startsWith('data-')) {
        const newKey = camelize(key.substr(5).toLowerCase())
        const value = $attrs[key]
        dataset[newKey] = force ? value : dataset[newKey] || value
      }
    }
  }
  if (vm) {
    let $child = vm
    while ($child && $child.$el === target) {
      updateDataset($child)
      $child = $child.$children[0]
    }
    let $parent = vm.$parent
    while ($parent && $parent.$el === target) {
      updateDataset($parent, true)
      $parent = $parent.$parent
    }
  } else {
    dataset = Object.assign({}, target.dataset, target.__uniDataset)
  }
  return normalizeDataset(dataset)
}

export function upx2px (str) {
  str = str + ''
  if (str.indexOf('upx') !== -1) { // upx转换
    return uni.upx2px(parseInt(str) || 0)
  }
  return parseInt(str) || 0
}

export function findExistsPageIndex (url) {
  const pages = getCurrentPages()
  let len = pages.length
  while (len--) {
    const page = pages[len]
    if (page.$page && page.$page.fullPath === url) {
      return len
    }
  }
  return -1
}