import JSZip from 'jszip'
import xmlConvert from 'xml-js'

//  解析.xmind文件
const parseXmindFile = file => {
  return new Promise((resolve, reject) => {
    JSZip.loadAsync(file).then(
      async zip => {
        try {
          let content = ''
          if (zip.files['content.json']) {
            let json = await zip.files['content.json'].async('string')
            content = transformXmind(json)
          } else if (zip.files['content.xml']) {
            let xml = await zip.files['content.xml'].async('string')
            let json = xmlConvert.xml2json(xml)
            content = transformOldXmind(json)
          }
          if (content) {
            resolve(content)
          } else {
            reject(new Error('解析失败'))
          }
        } catch (error) {
          reject(error)
        }
      },
      e => {
        reject(e)
      }
    )
  })
}

//  转换xmind数据
const transformXmind = content => {
  let data = JSON.parse(content)[0]
  let nodeTree = data.rootTopic
  let newTree = {}
  let walk = (node, newNode) => {
    newNode.data = {
      // 节点内容
      text: node.title
    }
    // 节点备注
    if (node.notes) {
      newNode.data.note = (node.notes.realHTML || node.notes.plain).content
    }
    // 超链接
    if (node.href && /^https?:\/\//.test(node.href)) {
      newNode.data.hyperlink = node.href
    }
    // 标签
    if (node.labels && node.labels.length > 0) {
      newNode.data.tag = node.labels
    }
    // 子节点
    newNode.children = []
    if (
      node.children &&
      node.children.attached &&
      node.children.attached.length > 0
    ) {
      node.children.attached.forEach(item => {
        let newChild = {}
        newNode.children.push(newChild)
        walk(item, newChild)
      })
    }
  }
  walk(nodeTree, newTree)
  return newTree
}

//  转换旧版xmind数据，xmind8
const transformOldXmind = content => {
  let data = JSON.parse(content)
  let elements = data.elements
  let root = null
  let getRoot = arr => {
    for (let i = 0; i < arr.length; i++) {
      if (!root && arr[i].name === 'topic') {
        root = arr[i]
        return
      }
    }
    arr.forEach(item => {
      getRoot(item.elements)
    })
  }
  getRoot(elements)
  let newTree = {}
  let getItemByName = (arr, name) => {
    return arr.find(item => {
      return item.name === name
    })
  }
  let walk = (node, newNode) => {
    let nodeElements = node.elements
    newNode.data = {
      // 节点内容
      text: getItemByName(nodeElements, 'title').elements[0].text
    }
    try {
      // 节点备注
      let notesElement = getItemByName(nodeElements, 'notes')
      if (notesElement) {
        newNode.data.note =
          notesElement.elements[0].elements[0].elements[0].text
      }
    } catch (error) {
      console.log(error)
    }
    try {
      // 超链接
      if (
        node.attributes &&
        node.attributes['xlink:href'] &&
        /^https?:\/\//.test(node.attributes['xlink:href'])
      ) {
        newNode.data.hyperlink = node.attributes['xlink:href']
      }
    } catch (error) {
      console.log(error)
    }
    try {
      // 标签
      let labelsElement = getItemByName(nodeElements, 'labels')
      if (labelsElement) {
        newNode.data.tag = labelsElement.elements.map(item => {
          return item.elements[0].text
        })
      }
    } catch (error) {
      console.log(error)
    }
    // 子节点
    newNode.children = []
    let _children = getItemByName(nodeElements, 'children')
    if (_children && _children.elements && _children.elements.length > 0) {
      _children.elements.forEach(item => {
        if (item.name === 'topics') {
          item.elements.forEach(item2 => {
            let newChild = {}
            newNode.children.push(newChild)
            walk(item2, newChild)
          })
        } else {
          let newChild = {}
          newNode.children.push(newChild)
          walk(item, newChild)
        }
      })
    }
  }
  walk(root, newTree)
  return newTree
}

export default {
  parseXmindFile,
  transformXmind,
  transformOldXmind
}