"use strict";
  
  const ValidityState = require("../generated/ValidityState");
  const { isDisabled } = require("../helpers/form-controls");
  const { closest } = require("../helpers/traversal");
  const { fireAnEvent } = require("../helpers/events");
  
  exports.implementation = class DefaultConstraintValidationImpl {
    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-cva-willvalidate
    get willValidate() {
      return this._isCandidateForConstraintValidation();
    }
  
    get validity() {
      if (!this._validity) {
        this._validity = ValidityState.createImpl(this._globalObject, [], {
          element: this
        });
      }
      return this._validity;
    }
  
    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-cva-checkvalidity
    checkValidity() {
      if (!this._isCandidateForConstraintValidation()) {
        return true;
      }
      if (this._satisfiesConstraints()) {
        return true;
      }
      fireAnEvent("invalid", this, undefined, { cancelable: true });
      return false;
    }
  
    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-cva-setcustomvalidity
    setCustomValidity(message) {
      this._customValidityErrorMessage = message;
    }
  
    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-cva-reportvalidity
    // Since jsdom has no user interaction, it's the same as #checkValidity
    reportValidity() {
      return this.checkValidity();
    }
  
    // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-cva-validationmessage
    get validationMessage() {
      const { validity } = this;
      if (!this._isCandidateForConstraintValidation() || this._satisfiesConstraints()) {
        return "";
      }
      const isSufferingFromCustomError = validity.customError;
      if (isSufferingFromCustomError) {
        return this._customValidityErrorMessage;
      }
      return "Constraints not satisfied";
    }
  
    _isCandidateForConstraintValidation() {
      // https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#attr-fe-disabled
      return !isDisabled(this) &&
        // If an element has a datalist element ancestor,
        // it is barred from constraint validation.
        closest(this, "datalist") === null &&
        !this._barredFromConstraintValidationSpecialization();
    }
  
    _isBarredFromConstraintValidation() {
      return !this._isCandidateForConstraintValidation();
    }
  
    _satisfiesConstraints() {
      return this.validity.valid;
    }
  };