// Mixins
import { provide as RegistrableProvide } from '../../mixins/registrable';
/* @vue/component */

export default RegistrableProvide('form').extend({
  name: 'v-form',
  inheritAttrs: false,
  props: {
    value: Boolean,
    lazyValidation: Boolean
  },
  data: () => ({
    inputs: [],
    watchers: [],
    errorBag: {}
  }),
  watch: {
    errorBag: {
      handler(val) {
        const errors = Object.values(val).includes(true);
        this.$emit('input', !errors);
      },

      deep: true,
      immediate: true
    }
  },
  methods: {
    watchInput(input) {
      const watcher = input => {
        return input.$watch('hasError', val => {
          this.$set(this.errorBag, input._uid, val);
        }, {
          immediate: true
        });
      };

      const watchers = {
        _uid: input._uid,
        valid: () => {},
        shouldValidate: () => {}
      };

      if (this.lazyValidation) {
        // Only start watching inputs if we need to
        watchers.shouldValidate = input.$watch('shouldValidate', val => {
          if (!val) return; // Only watch if we're not already doing it

          if (this.errorBag.hasOwnProperty(input._uid)) return;
          watchers.valid = watcher(input);
        });
      } else {
        watchers.valid = watcher(input);
      }

      return watchers;
    },

    /** @public */
    validate() {
      return this.inputs.every(input => input.validate(true));
    },

    /** @public */
    reset() {
      this.inputs.forEach(input => input.reset());
      this.resetErrorBag();
    },

    resetErrorBag() {
      if (this.lazyValidation) {
        // Account for timeout in validatable
        setTimeout(() => {
          this.errorBag = {};
        }, 0);
      }
    },

    /** @public */
    resetValidation() {
      this.inputs.forEach(input => input.resetValidation());
      this.resetErrorBag();
    },

    register(input) {
      this.inputs.push(input);
      this.watchers.push(this.watchInput(input));
    },

    unregister(input) {
      const found = this.inputs.find(i => i._uid === input._uid);
      if (!found) return;
      const unwatch = this.watchers.find(i => i._uid === found._uid);

      if (unwatch) {
        unwatch.valid();
        unwatch.shouldValidate();
      }

      this.watchers = this.watchers.filter(i => i._uid !== found._uid);
      this.inputs = this.inputs.filter(i => i._uid !== found._uid);
      this.$delete(this.errorBag, found._uid);
    }

  },

  render(h) {
    return h('form', {
      staticClass: 'v-form',
      attrs: {
        novalidate: true,
        ...this.$attrs
      },
      on: {
        submit: e => this.$emit('submit', e)
      }
    }, this.$slots.default);
  }

});
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