/* eslint-disable comma-dangle, class-methods-use-this, max-len, space-before-function-paren, arrow-parens, no-param-reassign */

require('./gl_field_error');

((global) => {
  const customValidationFlag = 'gl-field-error-ignore';

  class GlFieldErrors {
    constructor(form) {
      this.form = $(form);
      this.state = {
        inputs: [],
        valid: false
      };
      this.initValidators();
    }

    initValidators () {
      // register selectors here as needed
      const validateSelectors = [':text', ':password', '[type=email]']
        .map((selector) => `input${selector}`).join(',');

      this.state.inputs = this.form.find(validateSelectors).toArray()
        .filter((input) => !input.classList.contains(customValidationFlag))
        .map((input) => new global.GlFieldError({ input, formErrors: this }));

      this.form.on('submit', this.catchInvalidFormSubmit);
    }

    /* Neccessary to prevent intercept and override invalid form submit
     * because Safari & iOS quietly allow form submission when form is invalid
     * and prevents disabling of invalid submit button by application.js */

    catchInvalidFormSubmit (event) {
      if (!event.currentTarget.checkValidity()) {
        event.preventDefault();
        event.stopPropagation();
      }
    }

    focusOnFirstInvalid () {
      const firstInvalid = this.state.inputs.filter((input) => !input.inputDomElement.validity.valid)[0];
      firstInvalid.inputElement.focus();
    }
  }

  global.GlFieldErrors = GlFieldErrors;
})(window.gl || (window.gl = {}));
