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import { Vue } from '../vue'
import { PROP_TYPE_ARRAY_OBJECT, PROP_TYPE_STRING } from '../constants/props'
import { get } from '../utils/get'
import { stripTags } from '../utils/html'
import { isArray, isPlainObject, isUndefined } from '../utils/inspect'
import { keys } from '../utils/object'
import { makeProp, makePropsConfigurable } from '../utils/props'
import { warn } from '../utils/warn'

// --- Constants ---

const OPTIONS_OBJECT_DEPRECATED_MSG =
  'Setting prop "options" to an object is deprecated. Use the array format instead.'

// --- Props ---

export const props = makePropsConfigurable(
  {
    disabledField: makeProp(PROP_TYPE_STRING, 'disabled'),
    htmlField: makeProp(PROP_TYPE_STRING, 'html'),
    options: makeProp(PROP_TYPE_ARRAY_OBJECT, []),
    textField: makeProp(PROP_TYPE_STRING, 'text'),
    valueField: makeProp(PROP_TYPE_STRING, 'value')
  },
  'formOptionControls'
)

// --- Mixin ---

// @vue/component
export const formOptionsMixin = Vue.extend({
  props,
  computed: {
    formOptions() {
      return this.normalizeOptions(this.options)
    }
  },
  methods: {
    normalizeOption(option, key = null) {
      // When the option is an object, normalize it
      if (isPlainObject(option)) {
        const value = get(option, this.valueField)
        const text = get(option, this.textField)
        return {
          value: isUndefined(value) ? key || text : value,
          text: stripTags(String(isUndefined(text) ? key : text)),
          html: get(option, this.htmlField),
          disabled: Boolean(get(option, this.disabledField))
        }
      }
      // Otherwise create an `<option>` object from the given value
      return {
        value: key || option,
        text: stripTags(String(option)),
        disabled: false
      }
    },
    normalizeOptions(options) {
      // Normalize the given options array
      if (isArray(options)) {
        return options.map(option => this.normalizeOption(option))
      } else if (isPlainObject(options)) {
        // Deprecate the object options format
        warn(OPTIONS_OBJECT_DEPRECATED_MSG, this.$options.name)
        // Normalize a `options` object to an array of options
        return keys(options).map(key => this.normalizeOption(options[key] || {}, key))
      }
      // If not an array or object, return an empty array
      /* istanbul ignore next */
      return []
    }
  }
})