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/**
 * The quizbase class to provide shared functionality to Modules within Moodle.
 *
 * @module moodle-mod_quiz-quizbase
 */
var QUIZBASENAME = 'mod_quiz-quizbase';

var QUIZBASE = function() {
    QUIZBASE.superclass.constructor.apply(this, arguments);
};

/**
 * The coursebase class to provide shared functionality to Modules within
 * Moodle.
 *
 * @class M.course.coursebase
 * @constructor
 */
Y.extend(QUIZBASE, Y.Base, {
    // Registered Modules
    registermodules: [],

/**
     * Register a new Javascript Module
     *
     * @method register_module
     * @param {Object} The instantiated module to call functions on
     * @chainable
     */
    register_module: function(object) {
        this.registermodules.push(object);

return this;
    },

/**
     * Invoke the specified function in all registered modules with the given arguments
     *
     * @method invoke_function
     * @param {String} functionname The name of the function to call
     * @param {mixed} args The argument supplied to the function
     * @chainable
     */
    invoke_function: function(functionname, args) {
        var module;
        for (module in this.registermodules) {
            if (functionname in this.registermodules[module]) {
                this.registermodules[module][functionname](args);
            }
        }

return this;
    }
}, {
    NAME: QUIZBASENAME,
    ATTRS: {}
});

// Ensure that M.course exists and that coursebase is initialised correctly
M.mod_quiz = M.mod_quiz || {};
M.mod_quiz.quizbase = M.mod_quiz.quizbase || new QUIZBASE();

// Abstract functions that needs to be defined per format (course/format/somename/format.js)
M.mod_quiz.edit = M.mod_quiz.edit || {};

/**
 * Swap section (should be defined in format.js if requred)
 *
 * @param {YUI} Y YUI3 instance
 * @param {string} node1 node to swap to
 * @param {string} node2 node to swap with
 * @return {NodeList} section list
 */
M.mod_quiz.edit.swap_sections = function(Y, node1, node2) {
    var CSS = {
        COURSECONTENT: 'mod-quiz-edit-content',
        SECTIONADDMENUS: 'section_add_menus'
    };

var sectionlist = Y.Node.all('.' + CSS.COURSECONTENT + ' li.section');
    // Swap menus.
    sectionlist.item(node1).one('.' + CSS.SECTIONADDMENUS).swap(sectionlist.item(node2).one('.' + CSS.SECTIONADDMENUS));
};

/**
 * Process sections after ajax response (should be defined in format.js)
 * If some response is expected, we pass it over to format, as it knows better
 * hot to process it.
 *
 * @param {YUI} Y YUI3 instance
 * @param {NodeList} list of sections
 * @param {array} response ajax response
 * @param {string} sectionfrom first affected section
 * @param {string} sectionto last affected section
 * @return void
 */
M.mod_quiz.edit.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.
            sectionlist.item(i).one('.' + CSS.SECTIONNAME).setContent(response.sectiontitles[i]);

// 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.

// Remove the current class as section has been moved.
            sectionlist.item(i).removeClass('current');
        }
        // If there is a current section, apply corresponding class in order to highlight it.
        if (response.current !== -1) {
            // Add current class to the required section.
            sectionlist.item(response.current).addClass('current');
        }
    }
};