import classNames from 'classnames'
import PropTypes from '../_util/vue-types'
import Radio from './Radio'
import { getOptionProps, filterEmpty, hasProp } from '../_util/props-util'
function noop () {}

function getCheckedValue (children) {
  let value = null
  let matched = false
  children.forEach((radio) => {
    if (radio && radio.componentOptions && radio.componentOptions.propsData.checked) {
      value = radio.componentOptions.propsData.value
      matched = true
    }
  })
  return matched ? { value } : undefined
}

export default {
  name: 'ARadioGroup',
  props: {
    prefixCls: {
      default: 'ant-radio',
      type: String,
    },
    defaultValue: PropTypes.any,
    value: PropTypes.any,
    size: {
      default: 'default',
      validator (value) {
        return ['large', 'default', 'small'].includes(value)
      },
    },
    options: {
      default: () => [],
      type: Array,
    },
    disabled: Boolean,
    name: String,
    buttonStyle: PropTypes.string.def('outline'),
  },
  data () {
    const { value, defaultValue } = this
    return {
      stateValue: value || defaultValue,
    }
  },
  model: {
    prop: 'value',
  },
  provide () {
    return {
      radioGroupContext: this,
    }
  },
  computed: {
    radioOptions () {
      const { disabled } = this
      return this.options.map(option => {
        return typeof option === 'string'
          ? { label: option, value: option }
          : { ...option, disabled: option.disabled === undefined ? disabled : option.disabled }
      })
    },
    classes () {
      const { prefixCls, size } = this
      return {
        [`${prefixCls}`]: true,
        [`${prefixCls}-${size}`]: size,
      }
    },
  },
  methods: {
    onRadioChange (ev) {
      const lastValue = this.stateValue
      const { value } = ev.target
      if (!hasProp(this, 'value')) {
        this.stateValue = value
      }
      if (value !== lastValue) {
        this.$emit('input', value)
        this.$emit('change', ev)
      }
    },
  },
  watch: {
    value (val) {
      this.stateValue = val
    },
  },
  render () {
    const { mouseenter = noop, mouseleave = noop } = this.$listeners
    const props = getOptionProps(this)
    const { prefixCls, options, buttonStyle } = props
    const groupPrefixCls = `${prefixCls}-group`
    const classString = classNames(groupPrefixCls, `${groupPrefixCls}-${buttonStyle}`, {
      [`${groupPrefixCls}-${props.size}`]: props.size,
    })

    let children = filterEmpty(this.$slots.default)

    // 如果存在 options, 优先使用
    if (options && options.length > 0) {
      children = options.map((option, index) => {
        if (typeof option === 'string') {
          return (
            <Radio
              key={index}
              prefixCls={prefixCls}
              disabled={props.disabled}
              value={option}
              onChange={this.onRadioChange}
              checked={this.stateValue === option}
            >
              {option}
            </Radio>
          )
        } else {
          return (
            <Radio
              key={index}
              prefixCls={prefixCls}
              disabled={option.disabled || props.disabled}
              value={option.value}
              onChange={this.onRadioChange}
              checked={this.stateValue === option.value}
            >
              {option.label}
            </Radio>
          )
        }
      })
    }

    return (
      <div
        class={classString}
        onMouseenter={mouseenter}
        onMouseleave={mouseleave}
      >
        {children}
      </div>
    )
  },
}