import hoistStatics from 'hoist-non-react-statics'

function getDisplayName (WrappedComponent) {
  return WrappedComponent.displayName || WrappedComponent.name || 'WrappedComponent'
}

export function argumentContainer (Container, WrappedComponent) {
  /* eslint no-param-reassign:0 */
  Container.displayName = `Form(${getDisplayName(WrappedComponent)})`
  Container.WrappedComponent = WrappedComponent
  return hoistStatics(Container, WrappedComponent)
}

export function identity (obj) {
  return obj
}

export function flattenArray (arr) {
  return Array.prototype.concat.apply([], arr)
}

export function treeTraverse (path = '', tree, isLeafNode, errorMessage, callback) {
  if (isLeafNode(path, tree)) {
    callback(path, tree)
  } else if (tree === undefined) {
    return
  } else if (Array.isArray(tree)) {
    tree.forEach((subTree, index) => treeTraverse(
      `${path}[${index}]`,
      subTree,
      isLeafNode,
      errorMessage,
      callback
    ))
  } else { // It's object and not a leaf node
    if (typeof tree !== 'object') {
      console.error(errorMessage)
      return
    }
    Object.keys(tree).forEach(subTreeKey => {
      const subTree = tree[subTreeKey]
      treeTraverse(
        `${path}${path ? '.' : ''}${subTreeKey}`,
        subTree,
        isLeafNode,
        errorMessage,
        callback
      )
    })
  }
}

export function flattenFields (maybeNestedFields, isLeafNode, errorMessage) {
  const fields = {}
  treeTraverse(undefined, maybeNestedFields, isLeafNode, errorMessage, (path, node) => {
    fields[path] = node
  })
  return fields
}

export function normalizeValidateRules (validate, rules, validateTrigger) {
  const validateRules = validate.map((item) => {
    const newItem = {
      ...item,
      trigger: item.trigger || [],
    }
    if (typeof newItem.trigger === 'string') {
      newItem.trigger = [newItem.trigger]
    }
    return newItem
  })
  if (rules) {
    validateRules.push({
      trigger: validateTrigger ? [].concat(validateTrigger) : [],
      rules,
    })
  }
  return validateRules
}

export function getValidateTriggers (validateRules) {
  return validateRules
    .filter(item => !!item.rules && item.rules.length)
    .map(item => item.trigger)
    .reduce((pre, curr) => pre.concat(curr), [])
}

export function getValueFromEvent (e) {
  // To support custom element
  if (!e || !e.target) {
    return e
  }
  const { target } = e
  return target.type === 'checkbox' ? target.checked : target.value
}

export function getErrorStrs (errors) {
  if (errors) {
    return errors.map((e) => {
      if (e && e.message) {
        return e.message
      }
      return e
    })
  }
  return errors
}

export function getParams (ns, opt, cb) {
  let names = ns
  let options = opt
  let callback = cb
  if (cb === undefined) {
    if (typeof names === 'function') {
      callback = names
      options = {}
      names = undefined
    } else if (Array.isArray(names)) {
      if (typeof options === 'function') {
        callback = options
        options = {}
      } else {
        options = options || {}
      }
    } else {
      callback = options
      options = names || {}
      names = undefined
    }
  }
  return {
    names,
    options,
    callback,
  }
}

export function isEmptyObject (obj) {
  return Object.keys(obj).length === 0
}

export function hasRules (validate) {
  if (validate) {
    return validate.some((item) => {
      return item.rules && item.rules.length
    })
  }
  return false
}

export function startsWith (str, prefix) {
  return str.lastIndexOf(prefix, 0) === 0
}