import Wave from '../_util/wave'
import Icon from '../icon'
const rxTwoCNChar = /^[\u4e00-\u9fa5]{2}$/
const isTwoCNChar = rxTwoCNChar.test.bind(rxTwoCNChar)
import buttonTypes from './buttonTypes'
import { filterEmpty } from '../_util/props-util'
const props = buttonTypes()
export default {
  inheritAttrs: false,
  name: 'AButton',
  __ANT_BUTTON: true,
  props,
  data () {
    return {
      sizeMap: {
        large: 'lg',
        small: 'sm',
      },
      // clicked: false,
      sLoading: !!this.loading,
      hasTwoCNChar: false,
    }
  },
  mounted () {
    this.fixTwoCNChar()
  },
  updated () {
    this.fixTwoCNChar()
  },
  beforeDestroy () {
    // if (this.timeout) {
    //   clearTimeout(this.timeout)
    // }
    if (this.delayTimeout) {
      clearTimeout(this.delayTimeout)
    }
  },
  watch: {
    loading (val) {
      clearTimeout(this.delayTimeout)
      if (typeof val !== 'boolean' && val && val.delay) {
        this.delayTimeout = setTimeout(() => { this.sLoading = !!val }, val.delay)
      } else {
        this.sLoading = !!val
      }
    },
  },
  computed: {
    classes () {
      const { prefixCls, type, shape, size, hasTwoCNChar,
        sLoading, ghost, block, sizeMap, icon, $slots } = this
      const sizeCls = sizeMap[size] || ''
      const children = filterEmpty($slots.default)
      return {
        [`${prefixCls}`]: true,
        [`${prefixCls}-${type}`]: type,
        [`${prefixCls}-${shape}`]: shape,
        [`${prefixCls}-${sizeCls}`]: sizeCls,
        [`${prefixCls}-icon-only`]: !children && children !== 0 && icon,
        [`${prefixCls}-loading`]: sLoading,
        [`${prefixCls}-background-ghost`]: ghost || type === 'ghost',
        [`${prefixCls}-two-chinese-chars`]: hasTwoCNChar,
        [`${prefixCls}-block`]: block,
      }
    },
  },
  methods: {
    fixTwoCNChar () {
      // Fix for HOC usage like <FormatMessage />
      const node = this.$refs.buttonNode
      if (!node) {
        return
      }
      const buttonText = node.textContent || node.innerText
      if (this.isNeedInserted() && isTwoCNChar(buttonText)) {
        if (!this.hasTwoCNChar) {
          this.hasTwoCNChar = true
        }
      } else if (this.hasTwoCNChar) {
        this.hasTwoCNChar = false
      }
    },
    handleClick (event) {
      const { sLoading } = this.$data
      if (sLoading) {
        return
      }
      this.$emit('click', event)
    },
    insertSpace (child, needInserted) {
      const SPACE = needInserted ? ' ' : ''
      if (typeof child.text === 'string') {
        let text = child.text.trim()
        if (isTwoCNChar(text)) {
          text = text.split('').join(SPACE)
        }
        return <span>{text}</span>
      }
      return child
    },
    isNeedInserted () {
      const { icon, $slots } = this
      return $slots.default && $slots.default.length === 1 && !icon
    },
  },
  render () {
    const { htmlType, classes, icon,
      disabled, handleClick,
      sLoading, $slots, $attrs, $listeners } = this
    const buttonProps = {
      attrs: {
        ...$attrs,
        disabled,
      },
      class: classes,
      on: {
        ...$listeners,
        click: handleClick,
      },
    }
    const iconType = sLoading ? 'loading' : icon
    const iconNode = iconType ? <Icon type={iconType} /> : null
    const kids = $slots.default && $slots.default.length === 1 ? this.insertSpace($slots.default[0], this.isNeedInserted()) : $slots.default

    if ($attrs.href !== undefined) {
      return (
        <a {...buttonProps} ref='buttonNode'>
          {iconNode}{kids}
        </a>
      )
    } else {
      return (
        <Wave>
          <button {...buttonProps} ref='buttonNode' type={htmlType || 'button'}>
            {iconNode}{kids}
          </button>
        </Wave>
      )
    }
  },
}