/* global zxcvbn */

window.wp = window.wp || {};

var passwordStrength;

(function($){

	wp.passwordStrength = {

		/**

		 * Determine the strength of a given password

		 *

		 * @param string password1 The password

		 * @param array blacklist An array of words that will lower the entropy of the password

		 * @param string password2 The confirmed password

		 */

		meter : function( password1, blacklist, password2 ) {

			if ( ! $.isArray( blacklist ) )

				blacklist = [ blacklist.toString() ];

			if (password1 != password2 && password2 && password2.length > 0)

				return 5;

			var result = zxcvbn( password1, blacklist );

			return result.score;

		},

		/**

		 * Builds an array of data that should be penalized, because it would lower the entropy of a password if it were used

		 *

		 * @return array The array of data to be blacklisted

		 */

		userInputBlacklist : function() {

			var i, userInputFieldsLength, rawValuesLength, currentField,

				rawValues       = [],

				blacklist       = [],

				userInputFields = [ 'user_login', 'first_name', 'last_name', 'nickname', 'display_name', 'email', 'url', 'description', 'weblog_title', 'admin_email' ];

			// Collect all the strings we want to blacklist

			rawValues.push( document.title );

			rawValues.push( document.URL );

			userInputFieldsLength = userInputFields.length;

			for ( i = 0; i < userInputFieldsLength; i++ ) {

				currentField = $( '#' + userInputFields[ i ] );

				if ( 0 === currentField.length ) {

					continue;

				}

				rawValues.push( currentField[0].defaultValue );

				rawValues.push( currentField.val() );

			}

			// Strip out non-alphanumeric characters and convert each word to an individual entry

			rawValuesLength = rawValues.length;

			for ( i = 0; i < rawValuesLength; i++ ) {

				if ( rawValues[ i ] ) {

					blacklist = blacklist.concat( rawValues[ i ].replace( /\W/g, ' ' ).split( ' ' ) );

				}

			}

			// Remove empty values, short words, and duplicates. Short words are likely to cause many false positives.

			blacklist = $.grep( blacklist, function( value, key ) {

				if ( '' === value || 4 > value.length ) {

					return false;

				}

				return $.inArray( value, blacklist ) === key;

			});

			return blacklist;

		}

	};

	// Backwards compatibility.

	passwordStrength = wp.passwordStrength.meter;

})(jQuery);