/**
 * 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 + ' ' + M.mod_quiz.edit.get_section_selector(Y));
    // 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 img'
    };

    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');
        }
    }
};

/**
* Get sections config for this format, for examples see function definition
* in the formats.
*
* @return {object} section list configuration
*/
M.mod_quiz.edit.get_config = function() {
    return {
        container_node : 'ul',
        container_class : 'slots',
        section_node : 'li',
        section_class : 'section'
    };
};

/**
 * Get section list for this format (usually items inside container_node.container_class selector)
 *
 * @param {YUI} Y YUI3 instance
 * @return {string} section selector
 */
M.mod_quiz.edit.get_section_selector = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_node && config.section_class) {
        return config.section_node + '.' + config.section_class;
    }
    Y.log('section_node and section_class are not defined in M.mod_quiz.edit.get_config', 'warn', 'moodle-mod_quiz-quizbase');
    return null;
};

/**
 * Get section wraper for this format (only used in case when each
 * container_node.container_class node is wrapped in some other element).
 *
 * @param {YUI} Y YUI3 instance
 * @return {string} section wrapper selector or M.mod_quiz.format.get_section_selector
 * if section_wrapper_node and section_wrapper_class are not defined in the format config.
 */
M.mod_quiz.edit.get_section_wrapper = function(Y) {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_wrapper_node && config.section_wrapper_class) {
        return config.section_wrapper_node + '.' + config.section_wrapper_class;
    }
    return M.mod_quiz.edit.get_section_selector(Y);
};

/**
 * Get the tag of container node
 *
 * @return {string} tag of container node.
 */
M.mod_quiz.edit.get_containernode = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.container_node) {
        return config.container_node;
    } else {
        Y.log('container_node is not defined in M.mod_quiz.edit.get_config', 'warn', 'moodle-mod_quiz-quizbase');
    }
};

/**
 * Get the class of container node
 *
 * @return {string} class of the container node.
 */
M.mod_quiz.edit.get_containerclass = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.container_class) {
        return config.container_class;
    } else {
        Y.log('container_class is not defined in M.mod_quiz.edit.get_config', 'warn', 'moodle-mod_quiz-quizbase');
    }
};

/**
 * Get the tag of draggable node (section wrapper if exists, otherwise section)
 *
 * @return {string} tag of the draggable node.
 */
M.mod_quiz.edit.get_sectionwrappernode = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_wrapper_node) {
        return config.section_wrapper_node;
    } else {
        return config.section_node;
    }
};

/**
 * Get the class of draggable node (section wrapper if exists, otherwise section)
 *
 * @return {string} class of the draggable node.
 */
M.mod_quiz.edit.get_sectionwrapperclass = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_wrapper_class) {
        return config.section_wrapper_class;
    } else {
        return config.section_class;
    }
};

/**
 * Get the tag of section node
 *
 * @return {string} tag of section node.
 */
M.mod_quiz.edit.get_sectionnode = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_node) {
        return config.section_node;
    } else {
        Y.log('section_node is not defined in M.mod_quiz.edit.get_config', 'warn', 'moodle-mod_quiz-quizbase');
    }
};

/**
 * Get the class of section node
 *
 * @return {string} class of the section node.
 */
M.mod_quiz.edit.get_sectionclass = function() {
    var config = M.mod_quiz.edit.get_config();
    if (config.section_class) {
        return config.section_class;
    } else {
        Y.log('section_class is not defined in M.mod_quiz.edit.get_config', 'warn', 'moodle-mod_quiz-quizbase');
    }
};