import dotProp from 'dot-prop'
import Schema from 'async-validator'


// Temporary Mixins from external styleguide
/**
 * @mixin
 */
export default {
  inject: {
    $parentForm: {
      default: null
    }
  },
  provide() {
    return {
      $parentInput: this
    }
  },
  props: {
    /**
     * The value of the input. Can be passed via v-model.
     */
    value: {
      type: [String, Object, Number, Array],
      default: null
    },
    /**
     * The model name when used within a form component. Uses dot notation.
     */
    model: {
      type: String,
      default: null
    },
    /**
     * Name to use on the input for accessibility
     */
    name: {
      type: String,
      default: null
    },
    /**
     * The label of the input.
     */
    label: {
      type: String,
      default: null
    },
    /**
     * The id of the input.
     */
    id: {
      type: String,
      default: null
    },
    /**
     * Whether the input is disabled or not.
     */
    disabled: {
      type: Boolean,
      default: false
    },
    /**
     * Whether the input should be read-only
     */
    readonly: {
      type: Boolean,
      default: false
    },
    /**
     * The async-validator schema used for the input.
     * @default null
     */
    schema: {
      type: Object,
      default: () => null
    },
    /**
     * The input's size.
     * @options small|base|large
     */
    size: {
      type: String,
      default: 'base',
      validator: value => {
        return value.match(/(small|base|large)/)
      }
    },
    tabindex: {
      type: Number,
      default: 0
    }
  },
  data() {
    return {
      innerValue: null,
      error: null,
      focus: false
    }
  },
  computed: {
    stateClasses() {
      return [
        this.size && `ds-input-size-${this.size}`,
        this.disabled && 'ds-input-is-disabled',
        this.readonly && 'ds-input-is-readonly',
        this.error && 'ds-input-has-error',
        this.focus && 'ds-input-has-focus'
      ]
    }
  },
  watch: {
    value: {
      handler(value) {
        this.innerValue = value
      },
      deep: true,
      immediate: true
    }
  },
  created() {
    if (this.$parentForm) {
      this.$parentForm.subscribe(this.handleFormUpdate)
    }
  },
  beforeDestroy() {
    if (this.$parentForm) {
      this.$parentForm.unsubscribe(this.handleFormUpdate)
    }
  },
  methods: {
    handleInput(event) {
      this.input(event.target.value)
    },
    input(value) {
      this.innerValue = value
      if (this.$parentForm) {
        this.$parentForm.update(this.model, value)
      } else {
        /**
         * Fires after user input.
         * Receives the value as the only argument.
         *
         * @event input
         */
        this.$emit('input', value)
        this.validate(value)
      }
    },
    handleFormUpdate(data, errors) {
      this.innerValue = dotProp.get(data, this.model)
      this.error = errors ? errors[this.model] : null
    },
    validate(value) {
      if (!this.schema) {
        return
      }
      const validator = new Schema({ input: this.schema })
      // Prevent validator from printing to console
      // eslint-disable-next-line
      const warn = console.warn;
      // eslint-disable-next-line
      console.warn = () => {};
      validator.validate({ input: value }, errors => {
        if (errors) {
          this.error = errors[0].message
        } else {
          this.error = null
        }
        // eslint-disable-next-line
        console.warn = warn;
      })
    },
    handleFocus() {
      this.focus = true
    },
    handleBlur() {
      this.focus = false
    }
  }
}