// Javascript functions for remuiformat course format list layout

M.course = M.course || {};

M.course.format = M.course.format || {};

/**
 * Get sections config for this format
 *
 * The section structure is:
 * <ul class="remui-format-list">
 *  <li class="section">...</li>
 *  <li class="section">...</li>
 *   ...
 * </ul>
 *
 * @return {object} section list configuration
 */
M.course.format.get_config = function() {
    return {
        container_node: 'ul',
        container_class: 'remui-format-list',
        section_node: 'li',
        section_class: 'section'
    };
};

/**
 * Swap section
 *
 * @param {YUI} Y YUI3 instance
 * @param {string} node1 node to swap to
 * @param {string} node2 node to swap with
 * @return {NodeList} section list
 */
M.course.format.swap_sections = function(Y, node1, node2) {
    var CSS = {
        COURSECONTENT: 'course-content',
        SECTIONADDMENUS: 'section_add_menus'
    };

    var sectionlist = Y.Node.all('.' + CSS.COURSECONTENT + ' ' + M.course.format.get_section_selector(Y));

    if (sectionlist.item(node1).one('.'+CSS.SECTIONADDMENUS)) {
        sectionlist.item(node1).one('.'+CSS.SECTIONADDMENUS).swap(sectionlist.item(node2).one('.'+CSS.SECTIONADDMENUS));
    }
};

/**
 * Process sections after ajax response
 *
 * @param {YUI} Y YUI3 instance
 * @param {array} response ajax response
 * @param {string} sectionfrom first affected section
 * @param {string} sectionto last affected section
 * @return void
 */
M.course.format.process_sections = function(Y, sectionlist, response, sectionfrom, sectionto) {
    var CSS = {
        SECTIONNAME: 'sectionname'
    },
    SELECTORS = {
        SECTIONLEFTSIDE: '.left .section-handle .icon'
    };
    if (response.action == 'move') {
        // If moving up swap around 'sectionfrom' and 'sectionto' so the that loop operates.
        if (sectionfrom > sectionto) {
            var temp = sectionto;
            sectionto = sectionfrom;
            sectionfrom = temp;
        }

        // Update titles and move icons in all affected sections.
        var ele, str, stridx, newstr;

        for (var i = sectionfrom; i <= sectionto; i++) {
            // Update section title.
            var content = Y.Node.create(response.sectiontitles[i]);
            sectionlist.item(i).all('h4.' + CSS.SECTIONNAME).setHTML(content);
            // Update move icon.
            ele = sectionlist.item(i).one(SELECTORS.SECTIONLEFTSIDE);
            str = ele.getAttribute('alt');
            stridx = str.lastIndexOf(' ');
            newstr = str.substr(0, stridx + 1) + i;
            ele.setAttribute('alt', newstr);
            ele.setAttribute('title', newstr); // For FireFox as 'alt' is not refreshed.
        }
    }
};