'use strict';

import $ from 'jquery';
import { Plugin } from './foundation.core.plugin';
import { GetYoDigits } from './foundation.core.utils';

/**
 * Abide module.
 * @module foundation.abide
 */

class Abide extends Plugin {
  /**
   * Creates a new instance of Abide.
   * @class
   * @name Abide
   * @fires Abide#init
   * @param {Object} element - jQuery object to add the trigger to.
   * @param {Object} options - Overrides to the default plugin settings.
   */
  _setup(element, options = {}) {
    this.$element = element;
    this.options  = $.extend(true, {}, Abide.defaults, this.$element.data(), options);

    this.className = 'Abide'; // ie9 back compat
    this._init();
  }

  /**
   * Initializes the Abide plugin and calls functions to get Abide functioning on load.
   * @private
   */
  _init() {
    this.$inputs = $.merge(                               // Consider as input to validate:
      this.$element.find('input').not('[type=submit]'),   // * all input fields expect submit
      this.$element.find('textarea, select')              // * all textareas and select fields
    );
    const $globalErrors = this.$element.find('[data-abide-error]');

    // Add a11y attributes to all fields
    if (this.options.a11yAttributes) {
      this.$inputs.each((i, input) => this.addA11yAttributes($(input)));
      $globalErrors.each((i, error) => this.addGlobalErrorA11yAttributes($(error)));
    }

    this._events();
  }

  /**
   * Initializes events for Abide.
   * @private
   */
  _events() {
    this.$element.off('.abide')
      .on('reset.zf.abide', () => {
        this.resetForm();
      })
      .on('submit.zf.abide', () => {
        return this.validateForm();
      });

    if (this.options.validateOn === 'fieldChange') {
      this.$inputs
        .off('change.zf.abide')
        .on('change.zf.abide', (e) => {
          this.validateInput($(e.target));
        });
    }

    if (this.options.liveValidate) {
      this.$inputs
        .off('input.zf.abide')
        .on('input.zf.abide', (e) => {
          this.validateInput($(e.target));
        });
    }

    if (this.options.validateOnBlur) {
      this.$inputs
        .off('blur.zf.abide')
        .on('blur.zf.abide', (e) => {
          this.validateInput($(e.target));
        });
    }
  }

  /**
   * Calls necessary functions to update Abide upon DOM change
   * @private
   */
  _reflow() {
    this._init();
  }

  /**
   * Checks whether or not a form element has the required attribute and if it's checked or not
   * @param {Object} element - jQuery object to check for required attribute
   * @returns {Boolean} Boolean value depends on whether or not attribute is checked or empty
   */
  requiredCheck($el) {
    if (!$el.attr('required')) return true;

    var isGood = true;

    switch ($el[0].type) {
      case 'checkbox':
        isGood = $el[0].checked;
        break;

      case 'select':
      case 'select-one':
      case 'select-multiple':
        var opt = $el.find('option:selected');
        if (!opt.length || !opt.val()) isGood = false;
        break;

      default:
        if(!$el.val() || !$el.val().length) isGood = false;
    }

    return isGood;
  }

  /**
   * Get:
   * - Based on $el, the first element(s) corresponding to `formErrorSelector` in this order:
   *   1. The element's direct sibling('s).
   *   2. The element's parent's children.
   * - Element(s) with the attribute `[data-form-error-for]` set with the element's id.
   *
   * This allows for multiple form errors per input, though if none are found, no form errors will be shown.
   *
   * @param {Object} $el - jQuery object to use as reference to find the form error selector.
   * @returns {Object} jQuery object with the selector.
   */
  findFormError($el) {
    var id = $el[0].id;
    var $error = $el.siblings(this.options.formErrorSelector);

    if (!$error.length) {
      $error = $el.parent().find(this.options.formErrorSelector);
    }

    if (id) {
      $error = $error.add(this.$element.find(`[data-form-error-for="${id}"]`));
    }

    return $error;
  }

  /**
   * Get the first element in this order:
   * 2. The <label> with the attribute `[for="someInputId"]`
   * 3. The `.closest()` <label>
   *
   * @param {Object} $el - jQuery object to check for required attribute
   * @returns {Boolean} Boolean value depends on whether or not attribute is checked or empty
   */
  findLabel($el) {
    var id = $el[0].id;
    var $label = this.$element.find(`label[for="${id}"]`);

    if (!$label.length) {
      return $el.closest('label');
    }

    return $label;
  }

  /**
   * Get the set of labels associated with a set of radio els in this order
   * 2. The <label> with the attribute `[for="someInputId"]`
   * 3. The `.closest()` <label>
   *
   * @param {Object} $el - jQuery object to check for required attribute
   * @returns {Boolean} Boolean value depends on whether or not attribute is checked or empty
   */
  findRadioLabels($els) {
    var labels = $els.map((i, el) => {
      var id = el.id;
      var $label = this.$element.find(`label[for="${id}"]`);

      if (!$label.length) {
        $label = $(el).closest('label');
      }
      return $label[0];
    });

    return $(labels);
  }

  /**
   * Adds the CSS error class as specified by the Abide settings to the label, input, and the form
   * @param {Object} $el - jQuery object to add the class to
   */
  addErrorClasses($el) {
    var $label = this.findLabel($el);
    var $formError = this.findFormError($el);

    if ($label.length) {
      $label.addClass(this.options.labelErrorClass);
    }

    if ($formError.length) {
      $formError.addClass(this.options.formErrorClass);
    }

    $el.addClass(this.options.inputErrorClass).attr({
      'data-invalid': '',
      'aria-invalid': true
    });
  }

  /**
   * Adds [for] and [role=alert] attributes to all form error targetting $el,
   * and [aria-describedby] attribute to $el toward the first form error.
   * @param {Object} $el - jQuery object
   */
  addA11yAttributes($el) {
    let $errors = this.findFormError($el);
    let $labels = $errors.filter('label');
    let $error = $errors.first();
    if (!$errors.length) return;

    // Set [aria-describedby] on the input toward the first form error if it is not set
    if (typeof $el.attr('aria-describedby') === 'undefined') {
      // Get the first error ID or create one
      let errorId = $error.attr('id');
      if (typeof errorId === 'undefined') {
        errorId = GetYoDigits(6, 'abide-error');
        $error.attr('id', errorId);
      };

      $el.attr('aria-describedby', errorId);
    }

    if ($labels.filter('[for]').length < $labels.length) {
      // Get the input ID or create one
      let elemId = $el.attr('id');
      if (typeof elemId === 'undefined') {
        elemId = GetYoDigits(6, 'abide-input');
        $el.attr('id', elemId);
      };

      // For each label targeting $el, set [for] if it is not set.
      $labels.each((i, label) => {
        const $label = $(label);
        if (typeof $label.attr('for') === 'undefined')
          $label.attr('for', elemId);
      });
    }

    // For each error targeting $el, set [role=alert] if it is not set.
    $errors.each((i, label) => {
      const $label = $(label);
      if (typeof $label.attr('role') === 'undefined')
        $label.attr('role', 'alert');
    }).end();
  }

  /**
   * Adds [aria-live] attribute to the given global form error $el.
   * @param {Object} $el - jQuery object to add the attribute to
   */
  addGlobalErrorA11yAttributes($el) {
    if (typeof $el.attr('aria-live') === 'undefined')
      $el.attr('aria-live', this.options.a11yErrorLevel);
  }

  /**
   * Remove CSS error classes etc from an entire radio button group
   * @param {String} groupName - A string that specifies the name of a radio button group
   *
   */
  removeRadioErrorClasses(groupName) {
    var $els = this.$element.find(`:radio[name="${groupName}"]`);
    var $labels = this.findRadioLabels($els);
    var $formErrors = this.findFormError($els);

    if ($labels.length) {
      $labels.removeClass(this.options.labelErrorClass);
    }

    if ($formErrors.length) {
      $formErrors.removeClass(this.options.formErrorClass);
    }

    $els.removeClass(this.options.inputErrorClass).attr({
      'data-invalid': null,
      'aria-invalid': null
    });

  }

  /**
   * Removes CSS error class as specified by the Abide settings from the label, input, and the form
   * @param {Object} $el - jQuery object to remove the class from
   */
  removeErrorClasses($el) {
    // radios need to clear all of the els
    if($el[0].type == 'radio') {
      return this.removeRadioErrorClasses($el.attr('name'));
    }

    var $label = this.findLabel($el);
    var $formError = this.findFormError($el);

    if ($label.length) {
      $label.removeClass(this.options.labelErrorClass);
    }

    if ($formError.length) {
      $formError.removeClass(this.options.formErrorClass);
    }

    $el.removeClass(this.options.inputErrorClass).attr({
      'data-invalid': null,
      'aria-invalid': null
    });
  }

  /**
   * Goes through a form to find inputs and proceeds to validate them in ways specific to their type.
   * Ignores inputs with data-abide-ignore, type="hidden" or disabled attributes set
   * @fires Abide#invalid
   * @fires Abide#valid
   * @param {Object} element - jQuery object to validate, should be an HTML input
   * @returns {Boolean} goodToGo - If the input is valid or not.
   */
  validateInput($el) {
    var clearRequire = this.requiredCheck($el),
        validated = false,
        customValidator = true,
        validator = $el.attr('data-validator'),
        equalTo = true;

    // don't validate ignored inputs or hidden inputs or disabled inputs
    if ($el.is('[data-abide-ignore]') || $el.is('[type="hidden"]') || $el.is('[disabled]')) {
      return true;
    }

    switch ($el[0].type) {
      case 'radio':
        validated = this.validateRadio($el.attr('name'));
        break;

      case 'checkbox':
        validated = clearRequire;
        break;

      case 'select':
      case 'select-one':
      case 'select-multiple':
        validated = clearRequire;
        break;

      default:
        validated = this.validateText($el);
    }

    if (validator) {
      customValidator = this.matchValidation($el, validator, $el.attr('required'));
    }

    if ($el.attr('data-equalto')) {
      equalTo = this.options.validators.equalTo($el);
    }


    var goodToGo = [clearRequire, validated, customValidator, equalTo].indexOf(false) === -1;
    var message = (goodToGo ? 'valid' : 'invalid') + '.zf.abide';

    if (goodToGo) {
      // Re-validate inputs that depend on this one with equalto
      const dependentElements = this.$element.find(`[data-equalto="${$el.attr('id')}"]`);
      if (dependentElements.length) {
        let _this = this;
        dependentElements.each(function() {
          if ($(this).val()) {
            _this.validateInput($(this));
          }
        });
      }
    }

    this[goodToGo ? 'removeErrorClasses' : 'addErrorClasses']($el);

    /**
     * Fires when the input is done checking for validation. Event trigger is either `valid.zf.abide` or `invalid.zf.abide`
     * Trigger includes the DOM element of the input.
     * @event Abide#valid
     * @event Abide#invalid
     */
    $el.trigger(message, [$el]);

    return goodToGo;
  }

  /**
   * Goes through a form and if there are any invalid inputs, it will display the form error element
   * @returns {Boolean} noError - true if no errors were detected...
   * @fires Abide#formvalid
   * @fires Abide#forminvalid
   */
  validateForm() {
    var acc = [];
    var _this = this;

    this.$inputs.each(function() {
      acc.push(_this.validateInput($(this)));
    });

    var noError = acc.indexOf(false) === -1;

    this.$element.find('[data-abide-error]').each((i, elem) => {
      const $elem = $(elem);
      // Ensure a11y attributes are set
      if (this.options.a11yAttributes) this.addGlobalErrorA11yAttributes($elem);
      // Show or hide the error
      $elem.css('display', (noError ? 'none' : 'block'));
    });

    /**
     * Fires when the form is finished validating. Event trigger is either `formvalid.zf.abide` or `forminvalid.zf.abide`.
     * Trigger includes the element of the form.
     * @event Abide#formvalid
     * @event Abide#forminvalid
     */
    this.$element.trigger((noError ? 'formvalid' : 'forminvalid') + '.zf.abide', [this.$element]);

    return noError;
  }

  /**
   * Determines whether or a not a text input is valid based on the pattern specified in the attribute. If no matching pattern is found, returns true.
   * @param {Object} $el - jQuery object to validate, should be a text input HTML element
   * @param {String} pattern - string value of one of the RegEx patterns in Abide.options.patterns
   * @returns {Boolean} Boolean value depends on whether or not the input value matches the pattern specified
   */
  validateText($el, pattern) {
    // A pattern can be passed to this function, or it will be infered from the input's "pattern" attribute, or it's "type" attribute
    pattern = (pattern || $el.attr('pattern') || $el.attr('type'));
    var inputText = $el.val();
    var valid = false;

    if (inputText.length) {
      // If the pattern attribute on the element is in Abide's list of patterns, then test that regexp
      if (this.options.patterns.hasOwnProperty(pattern)) {
        valid = this.options.patterns[pattern].test(inputText);
      }
      // If the pattern name isn't also the type attribute of the field, then test it as a regexp
      else if (pattern !== $el.attr('type')) {
        valid = new RegExp(pattern).test(inputText);
      }
      else {
        valid = true;
      }
    }
    // An empty field is valid if it's not required
    else if (!$el.prop('required')) {
      valid = true;
    }

    return valid;
   }

  /**
   * Determines whether or a not a radio input is valid based on whether or not it is required and selected. Although the function targets a single `<input>`, it validates by checking the `required` and `checked` properties of all radio buttons in its group.
   * @param {String} groupName - A string that specifies the name of a radio button group
   * @returns {Boolean} Boolean value depends on whether or not at least one radio input has been selected (if it's required)
   */
  validateRadio(groupName) {
    // If at least one radio in the group has the `required` attribute, the group is considered required
    // Per W3C spec, all radio buttons in a group should have `required`, but we're being nice
    var $group = this.$element.find(`:radio[name="${groupName}"]`);
    var valid = false, required = false;

    // For the group to be required, at least one radio needs to be required
    $group.each((i, e) => {
      if ($(e).attr('required')) {
        required = true;
      }
    });
    if(!required) valid=true;

    if (!valid) {
      // For the group to be valid, at least one radio needs to be checked
      $group.each((i, e) => {
        if ($(e).prop('checked')) {
          valid = true;
        }
      });
    };

    return valid;
  }

  /**
   * Determines if a selected input passes a custom validation function. Multiple validations can be used, if passed to the element with `data-validator="foo bar baz"` in a space separated listed.
   * @param {Object} $el - jQuery input element.
   * @param {String} validators - a string of function names matching functions in the Abide.options.validators object.
   * @param {Boolean} required - self explanatory?
   * @returns {Boolean} - true if validations passed.
   */
  matchValidation($el, validators, required) {
    required = required ? true : false;

    var clear = validators.split(' ').map((v) => {
      return this.options.validators[v]($el, required, $el.parent());
    });
    return clear.indexOf(false) === -1;
  }

  /**
   * Resets form inputs and styles
   * @fires Abide#formreset
   */
  resetForm() {
    var $form = this.$element,
        opts = this.options;

    $(`.${opts.labelErrorClass}`, $form).not('small').removeClass(opts.labelErrorClass);
    $(`.${opts.inputErrorClass}`, $form).not('small').removeClass(opts.inputErrorClass);
    $(`${opts.formErrorSelector}.${opts.formErrorClass}`).removeClass(opts.formErrorClass);
    $form.find('[data-abide-error]').css('display', 'none');
    $(':input', $form).not(':button, :submit, :reset, :hidden, :radio, :checkbox, [data-abide-ignore]').val('').attr({
      'data-invalid': null,
      'aria-invalid': null
    });
    $(':input:radio', $form).not('[data-abide-ignore]').prop('checked',false).attr({
      'data-invalid': null,
      'aria-invalid': null
    });
    $(':input:checkbox', $form).not('[data-abide-ignore]').prop('checked',false).attr({
      'data-invalid': null,
      'aria-invalid': null
    });
    /**
     * Fires when the form has been reset.
     * @event Abide#formreset
     */
    $form.trigger('formreset.zf.abide', [$form]);
  }

  /**
   * Destroys an instance of Abide.
   * Removes error styles and classes from elements, without resetting their values.
   */
  _destroy() {
    var _this = this;
    this.$element
      .off('.abide')
      .find('[data-abide-error]')
        .css('display', 'none');

    this.$inputs
      .off('.abide')
      .each(function() {
        _this.removeErrorClasses($(this));
      });
  }
}

/**
 * Default settings for plugin
 */
Abide.defaults = {
  /**
   * The default event to validate inputs. Checkboxes and radios validate immediately.
   * Remove or change this value for manual validation.
   * @option
   * @type {?string}
   * @default 'fieldChange'
   */
  validateOn: 'fieldChange',

  /**
   * Class to be applied to input labels on failed validation.
   * @option
   * @type {string}
   * @default 'is-invalid-label'
   */
  labelErrorClass: 'is-invalid-label',

  /**
   * Class to be applied to inputs on failed validation.
   * @option
   * @type {string}
   * @default 'is-invalid-input'
   */
  inputErrorClass: 'is-invalid-input',

  /**
   * Class selector to use to target Form Errors for show/hide.
   * @option
   * @type {string}
   * @default '.form-error'
   */
  formErrorSelector: '.form-error',

  /**
   * Class added to Form Errors on failed validation.
   * @option
   * @type {string}
   * @default 'is-visible'
   */
  formErrorClass: 'is-visible',

  /**
   * If true, automatically insert when possible:
   * - `[aria-describedby]` on fields
   * - `[role=alert]` on form errors and `[for]` on form error labels
   * - `[aria-live]` on global errors `[data-abide-error]` (see option `a11yErrorLevel`).
   * @option
   * @type {boolean}
   * @default true
   */
  a11yAttributes: true,

  /**
   * [aria-live] attribute value to be applied on global errors `[data-abide-error]`.
   * Options are: 'assertive', 'polite' and 'off'/null
   * @option
   * @see https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions
   * @type {string}
   * @default 'assertive'
   */
  a11yErrorLevel: 'assertive',

  /**
   * Set to true to validate text inputs on any value change.
   * @option
   * @type {boolean}
   * @default false
   */
  liveValidate: false,

  /**
   * Set to true to validate inputs on blur.
   * @option
   * @type {boolean}
   * @default false
   */
  validateOnBlur: false,

  patterns: {
    alpha : /^[a-zA-Z]+$/,
    alpha_numeric : /^[a-zA-Z0-9]+$/,
    integer : /^[-+]?\d+$/,
    number : /^[-+]?\d*(?:[\.\,]\d+)?$/,

    // amex, visa, diners
    card : /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|(?:222[1-9]|2[3-6][0-9]{2}|27[0-1][0-9]|2720)[0-9]{12}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$/,
    cvv : /^([0-9]){3,4}$/,

    // http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#valid-e-mail-address
    email : /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+$/,

    // From CommonRegexJS (@talyssonoc)
    // https://github.com/talyssonoc/CommonRegexJS/blob/e2901b9f57222bc14069dc8f0598d5f412555411/lib/commonregex.js#L76
    // For more restrictive URL Regexs, see https://mathiasbynens.be/demo/url-regex.
    url: /^((?:(https?|ftps?|file|ssh|sftp):\/\/|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\((?:[^\s()<>]+|(?:\([^\s()<>]+\)))*\))+(?:\((?:[^\s()<>]+|(?:\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?\xab\xbb\u201c\u201d\u2018\u2019]))$/,

    // abc.de
    domain : /^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,8}$/,

    datetime : /^([0-2][0-9]{3})\-([0-1][0-9])\-([0-3][0-9])T([0-5][0-9])\:([0-5][0-9])\:([0-5][0-9])(Z|([\-\+]([0-1][0-9])\:00))$/,
    // YYYY-MM-DD
    date : /(?:19|20)[0-9]{2}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-9])|(?:(?!02)(?:0[1-9]|1[0-2])-(?:30))|(?:(?:0[13578]|1[02])-31))$/,
    // HH:MM:SS
    time : /^(0[0-9]|1[0-9]|2[0-3])(:[0-5][0-9]){2}$/,
    dateISO : /^\d{4}[\/\-]\d{1,2}[\/\-]\d{1,2}$/,
    // MM/DD/YYYY
    month_day_year : /^(0[1-9]|1[012])[- \/.](0[1-9]|[12][0-9]|3[01])[- \/.]\d{4}$/,
    // DD/MM/YYYY
    day_month_year : /^(0[1-9]|[12][0-9]|3[01])[- \/.](0[1-9]|1[012])[- \/.]\d{4}$/,

    // #FFF or #FFFFFF
    color : /^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/,

    // Domain || URL
    website: {
      test: (text) => {
        return Abide.defaults.patterns['domain'].test(text) || Abide.defaults.patterns['url'].test(text);
      }
    }
  },

  /**
   * Optional validation functions to be used. `equalTo` being the only default included function.
   * Functions should return only a boolean if the input is valid or not. Functions are given the following arguments:
   * el : The jQuery element to validate.
   * required : Boolean value of the required attribute be present or not.
   * parent : The direct parent of the input.
   * @option
   */
  validators: {
    equalTo: function (el, required, parent) {
      return $(`#${el.attr('data-equalto')}`).val() === el.val();
    }
  }
}

export {Abide};