/**
 * @version $Id$
 * @uses $ jQuery
 * @uses _ Underscore
 */

"use strict";

(function (ns) {
    ns.TimeRanges = qs.createObject();
    ns.TimeRanges.prototype = {
        initialize: function (options) {
            this.options = $.extend({
                id: undefined,
                /** @type {String} Row template compatible with _.str.tpl() (placeholder {index}) */
                template: undefined
            }, options);

            /** @type {jQuery} */
            this.element = $('#' + this.options.id);
            if (1 != this.element.size()) {
                throw new Error('form.element.TimeRanges: Element "#' + this.options.id + '" not found');
            }
            this.element.data('instance', this);
            this.refreshDayPrefixes();
            return this;
        },

        setCount: function (count) {
            count = +count;
            var rows = this.element.find('tr'), rowCount = rows.size();

            if (count < 0 || count > 365) {
                throw new Error('Wrong parameter count');
            }

            if (count >= rowCount) {
                for (var i = rowCount; i < count; ++i) {
                    var row = _.str.tpl(this.options.template, {index: i + 1});
                    this.element.append(row);
                }
            } else {
                rows.slice(count).remove();
            }

            this.refreshDayPrefixes();

            return this;
        },

        refreshDayPrefixes: function () {
            var rows = this.element.find('tr'), count = rows.size();
            if (1 == count) {
                rows.find('[data-day-prefix]').hide();
            } else {
                rows.find('[data-day-prefix]').show();
            }
            return this;
        }
    };
})(qs.defineNS('form.element'));