var SideBlockAdmin = (function () {
    var SideBlockAdmin = function() { this.initialize.apply(this, arguments); };
    SideBlockAdmin.defaultOptions = {
        formId: undefined,
        TYPE_HTML: undefined,
        PAGE_CUSTOM: undefined,
        LINK_NONE: undefined,
        LINK_PAGE: undefined,
        LINK_URL: undefined
    };
    SideBlockAdmin.prototype = {
        initialize: function (options) {
            this.options = $.extend({}, SideBlockAdmin.defaultOptions, options);
            this.initForm();
            return this;
        },
        initForm: function () {
            this.$form = $('#' + this.options.formId);
            if (!this.$form.size()) {
                return this;
            }

            var rules = {
                blockType: [{
                    _value: this.options.TYPE_HTML,
                    toggle: '#content-label, #content-element'
                }],

                pageType: [{
                    _value: this.options.PAGE_CUSTOM,
                    toggle: '#idPage-label, #idPage-element'
                }],

                linkType: [
                    {
                        _value: this.options.LINK_NONE,
                        hide: '#linkTitle-label, #linkTitle-element, #linkPageId-label, #linkPageId-element, #linkUrl-label, #linkUrl-element'
                    },
                    {
                        _value: this.options.LINK_PAGE,
                        hide: '#linkUrl-label, #linkUrl-element',
                        show: '#linkTitle-label, #linkTitle-element, #linkPageId-label, #linkPageId-element'
                    },
                    {
                        _value: this.options.LINK_URL,
                        hide: '#linkPageId-label, #linkPageId-element',
                        show: '#linkTitle-label, #linkTitle-element, #linkUrl-label, #linkUrl-element'
                    }
                ]
            };

            var that = this,
                name, target;
            for (name in rules) {
                if (rules.hasOwnProperty(name)) {
                    target = this.$form.find('#' + name);
                    that.onElementChange(target, name, rules[name]);
                    target.bind('change.SideBlockAdmin', (function (name, rules) {
                        return function (e) { that.onElementChange(e.currentTarget, name, rules); };
                    })(name, rules[name]));
                }
            }
            return this;
        },

        /**
         * @param {HTMLElement|jQuery} target
         * @param {String} name
         * @param {Array}  rules
         */
        onElementChange: function (target, name, rules) {
            target = (target instanceof jQuery) ? target : $(target);
            var value = target.val(), rule, match;
            for (var i = 0, length = rules.length; i < length; ++i) {
                rule = rules[i];
                match = (rule._value === value);
                if (match || rule.toggle) {
                    this.proceedRules(rule, match);
                }
            }
        },

        /**
         * @param {Object} rule
         * @param {Boolean} match
         */
        proceedRules: function (rule, match) {
            var method, target;
            for (method in rule) {
                if (!rule.hasOwnProperty(method) || '_' === method.substring(0, 1)) {
                    continue;
                }
                target = $(rule[method]);
                switch (method) {
                    case 'toggle':
                        target[match ? 'show' : 'hide']();
                        break;
                    case 'show':
                        target.show();
                        break;
                    case 'hide':
                        target.hide();
                        break;
                    default:
                        alert('Unknown rule method "' + method + '" passed to SideBlockAdmin.proceedRules()');
                }
            }
            return this;
        }
    };

    return SideBlockAdmin;
})();