const utils = require('../../api/utils')

const { browserPath } = utils
const posix = browserPath()

function processRelationPath(self, relation) {
  const from = self.is; let
    to = relation
  if (to[0] === '.') {
    to = `../${to}`
  }
  const _p = posix.join(from, to)
  return _p
}

function _relationNode(node, info) {
  const { relationInfo, relation, _p } = info

  // 触发父级组件的 relations
  const type = relationInfo.type
  let parentType = ''
  if (type === 'parent') {
    parentType = 'child'
  } else if (type === 'ancestor') {
    parentType = 'descendant'
  }

  const parentCtx = node.$self
  const childCtx = this
  if (typeof parentCtx.props.theRelations === 'object') {
    Object.keys(parentCtx.props.theRelations)
      .forEach((_relation) => {
        const _relationInfo = parentCtx.props.theRelations[_relation]
        if (_relationInfo.type === parentType) {
          _relationNode.call(parentCtx, childCtx.$node, {
            relationInfo: _relationInfo,
            relation: _relation,
            _p: processRelationPath(parentCtx, _relation),
          })

          return true
        }
      })
  }
  

  node = node.$self
  
  this._storeRelationNodes = this._storeRelationNodes || {}
  if (this._storeRelationNodes[_p]) {
    this._storeRelationNodes[_p].push(node)
  } else {
    this._storeRelationNodes[_p] = [node]
  }
                    
  if (this._storeRelationNodes[relation]) {
    this._storeRelationNodes[relation].push(node)
  } else {
    this._storeRelationNodes[relation] = [node]
  }
  const ctx = this || {}
  this.getRelationNodes = function(__p) {
    this._storeRelationNodes = this._storeRelationNodes || {}
    return this._storeRelationNodes[__p] || []
  }

  
  if (typeof relationInfo.linked === 'function') {
    relationInfo.linked.call(ctx, node)
  }
  
  if (typeof relationInfo.linkChanged === 'function') {
    const self = this
    ctx._lifes = ctx._lifes || {}
    ctx._lifes.didUpdate = ctx._lifes.didUpdate || []
    ctx._lifes.didUpdate.push(() => {
      relationInfo.linkChanged.call(self, node)
    })
  }
  if (typeof relationInfo.unlinked === 'function') {
    const self = this
    ctx._lifes = ctx._lifes || {}
    ctx._lifes.didUnmount = ctx._lifes.didUnmount || []
    ctx._lifes.didUnmount.push(() => {
      relationInfo.unlinked.call(self, node)
    })
  }
}


module.exports = _relationNode