/**
 * Script for blocking repeated form submits
 *
 * @example
 * <code>
 * // automatic mode
 * $('form').formSubmitLock();
 *
 * // manual mode
 * if ($('form').formSubmitLock('getLocked')) return;
 * $('form').formSubmitLock('lock');
 * $('form').formSubmitLock('unlock');
 * </code>
 *
 * @version 1.0.0
 * @requires jQuery
 */
(function ($) {
    'use strict';

    var debug = false;

    /**
     * @constructor
     */
    var FormSubmitLock = function () {
        this.construct.apply(this, arguments);
    };

    FormSubmitLock.prototype.construct = function ($form, options) {
        debug && console.log('FormSubmitLock.construct');
        this.$form = $form;
        this.options = options;
    };

    FormSubmitLock.prototype.bindEvents = function () {
        debug && console.log('FormSubmitLock.bindEvents');
        this.$form.on('submit.' + this.options.nameProp, $.proxy(this.onSubmit, this));
    };

    FormSubmitLock.prototype.unbindEvents = function () {
        debug && console.log('FormSubmitLock.unbindEvents');
        this.$form.off('submit.' + this.options.nameProp);
    };

    FormSubmitLock.prototype.onSubmit = function (e) {
        if (this.getLocked()) {
            debug && console.log('FormSubmitLock.onSubmit preventDefault');
            e.preventDefault();
            e.stopPropagation();
        } else {
            this.lock();
        }
    };

    FormSubmitLock.prototype.lock = function () {
        debug && console.log('FormSubmitLock.lock');
        this.$form.data(this.options.lockProp, true);
    };

    FormSubmitLock.prototype.unlock = function () {
        debug && console.log('FormSubmitLock.unlock');
        this.$form.data(this.options.lockProp, false);
    };

    FormSubmitLock.prototype.getLocked = function () {
        debug && console.log('FormSubmitLock.getLocked');
        return !!this.$form.data(this.options.lockProp);
    };


    /**
     * @param {Object|String|?} option Method
     * @return {$.fn}
     */
    $.fn.formSubmitLock = function submitLock(option) {
        if (!this.is('form')) {
            throw new Error('FormSubmitLock: Target element is not a "form"');
        }

        var $this = this.first(),
            options = $.extend({}, $.fn.formSubmitLock.defaults, typeof option == 'object' && option),
            instance = $this.data(options.nameProp);
        if (null == instance) {
            instance = new FormSubmitLock($this, options);
            $this.data(options.nameProp, instance);
            if (null == option) instance.bindEvents();
        }
        if (instance && typeof option === 'string') {
            return instance[option]();
        }
        return this;
    };

    $.fn.formSubmitLock.defaults = {
        nameProp: 'formSubmitLock',
        lockProp: 'formSubmitLock.locked'
    };

})(window.jQuery);