/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/**
 * @fileOverview Input component.
 * Support v-model only if vue version is larger than 2.2.0
 */
let extractComponentStyle, mapFormEvents, appendCss

const ID_PREFIX_PLACEHOLDER_COLOR = 'wipt_plc_'
const ID_PREFIX_INPUT = 'wipt_'
let idCount = 0

const _css = `
.weex-input, .weex-textarea {
  font-size: 0.426667rem;
}
.weex-input:focus, .weex-textarea:focus {
  outline: none;
}
`

function setPlaceholderColor (inputVm, placeholderColor) {
  if (!placeholderColor) {
    return
  }
  const vendors = [
    '::-webkit-input-placeholder',
    ':-moz-placeholder',
    '::-moz-placeholder',
    ':-ms-input-placeholder',
    ':placeholder-shown'
  ]
  const id = inputVm._id
  appendCss(
    vendors.map(function (vendor, idx) {
      return `#${ID_PREFIX_INPUT}${id}${vendors[idx]}{color:${placeholderColor};}`
    }).join(''),
    `${ID_PREFIX_PLACEHOLDER_COLOR}${id}`,
    true)
}

function processStyle (vm) {
  const styles = extractComponentStyle(vm)
  const phColor = styles.placeholderColor
  if (phColor) {
    setPlaceholderColor(vm, phColor)
  }
  return styles
}

function getInput (weex) {
  const { inputCommon } = weex.mixins

  return {
    name: 'weex-input',
    mixins: [inputCommon],
    props: {
      type: {
        type: String,
        default: 'text',
        validator (value) {
          return [
            'email', 'number', 'password', 'search', 'tel', 'text', 'url', 'date',
            'datetime', 'time'
            // unsupported type:
            // button, checkbox, color, file, hidden, image,
            // month, radio, range, reset, submit, week,
          ].indexOf(value) !== -1
        }
      },
      value: String,
      placeholder: String,
      disabled: {
        type: [String, Boolean],
        default: false
      },
      autofocus: {
        type: [String, Boolean],
        default: false
      },
      maxlength: [String, Number],
      returnKeyType: String
    },

    render (createElement) {
      if (!this._id) {
        this._id = idCount++
      }
      const events = mapFormEvents(this)
      return createElement('html:input', {
        attrs: {
          'weex-type': 'input',
          id: `${ID_PREFIX_INPUT}${this._id}`,
          type: this.type,
          value: this.value,
          disabled: (this.disabled !== 'false' && this.disabled !== false),
          autofocus: (this.autofocus !== 'false' && this.autofocus !== false),
          placeholder: this.placeholder,
          maxlength: this.maxlength,
          'returnKeyType': this.returnKeyType
        },
        domProps: {
          value: this.value
        },
        on: this.createKeyboardEvent(events),
        staticClass: 'weex-input weex-el',
        staticStyle: processStyle(this)
      })
    },
    _css
  }
}

export default {
  init (weex) {
    extractComponentStyle = weex.extractComponentStyle
    mapFormEvents = weex.utils.mapFormEvents
    appendCss = weex.utils.appendCss

    weex.registerComponent('input', getInput(weex))
  }
}