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YUI.add('moodle-course-dragdrop', function (Y, NAME) {

/* eslint-disable no-unused-vars */
/**
 * Drag and Drop for course sections and course modules.
 *
 * @module moodle-course-dragdrop
 */

var CSS = {
    ACTIONAREA: '.actions',
    ACTIVITY: 'activity',
    ACTIVITYINSTANCE: 'activityinstance',
    CONTENT: 'content',
    COURSECONTENT: 'course-content',
    EDITINGMOVE: 'editing_move',
    ICONCLASS: 'iconsmall',
    JUMPMENU: 'jumpmenu',
    LEFT: 'left',
    LIGHTBOX: 'lightbox',
    MOVEDOWN: 'movedown',
    MOVEUP: 'moveup',
    PAGECONTENT: 'page-content',
    RIGHT: 'right',
    SECTION: 'section',
    SECTIONADDMENUS: 'section_add_menus',
    SECTIONHANDLE: 'section-handle',
    SUMMARY: 'summary',
    SECTIONDRAGGABLE: 'sectiondraggable'
};

M.course = M.course || {};
/**
 * Section drag and drop.
 *
 * @class M.course.dragdrop.section
 * @constructor
 * @extends M.core.dragdrop
 */
var DRAGSECTION = function() {
    DRAGSECTION.superclass.constructor.apply(this, arguments);
};
Y.extend(DRAGSECTION, M.core.dragdrop, {
    sectionlistselector: null,

initializer: function() {
        // Set group for parent class
        this.groups = [CSS.SECTIONDRAGGABLE];
        this.samenodeclass = M.course.format.get_sectionwrapperclass();
        this.parentnodeclass = M.course.format.get_containerclass();
        // Detect the direction of travel.
        this.detectkeyboarddirection = true;

// Check if we are in single section mode
        if (Y.Node.one('.' + CSS.JUMPMENU)) {
            return false;
        }
        // Initialise sections dragging
        this.sectionlistselector = M.course.format.get_section_wrapper(Y);
        if (this.sectionlistselector) {
            this.sectionlistselector = '.' + CSS.COURSECONTENT + ' ' + this.sectionlistselector;

this.setup_for_section(this.sectionlistselector);

// Make each li element in the lists of sections draggable
            var del = new Y.DD.Delegate({
                container: '.' + CSS.COURSECONTENT,
                nodes: '.' + CSS.SECTIONDRAGGABLE,
                target: true,
                handles: ['.' + CSS.LEFT],
                dragConfig: {groups: this.groups}
            });
            del.dd.plug(Y.Plugin.DDProxy, {
                // Don't move the node at the end of the drag
                moveOnEnd: false
            });
            del.dd.plug(Y.Plugin.DDConstrained, {
                // Keep it inside the .course-content
                constrain: '#' + CSS.PAGECONTENT,
                stickY: true
            });
            del.dd.plug(Y.Plugin.DDWinScroll);
        }
    },

// We skip the top section as it is not draggable
            if (sectionid > 0) {
                // Remove move icons
                var movedown = sectionnode.one('.' + CSS.RIGHT + ' a.' + CSS.MOVEDOWN);
                var moveup = sectionnode.one('.' + CSS.RIGHT + ' a.' + CSS.MOVEUP);

// Add dragger icon
                var title = M.util.get_string('movesection', 'moodle', sectionid);
                var cssleft = sectionnode.one('.' + CSS.LEFT);

if ((movedown || moveup) && cssleft) {
                    cssleft.setStyle('cursor', 'move');
                    cssleft.appendChild(this.get_drag_handle(title, CSS.SECTIONHANDLE, 'icon', true));

if (moveup) {
                        if (moveup.previous('br')) {
                            moveup.previous('br').remove();
                        } else if (moveup.next('br')) {
                            moveup.next('br').remove();
                        }

if (moveup.ancestor('.section_action_menu') && moveup.ancestor().get('nodeName').toLowerCase() == 'li') {
                            moveup.ancestor().remove();
                        } else {
                            moveup.remove();
                        }
                    }
                    if (movedown) {
                        if (movedown.previous('br')) {
                            movedown.previous('br').remove();
                        } else if (movedown.next('br')) {
                            movedown.next('br').remove();
                        }

var movedownParentType = movedown.ancestor().get('nodeName').toLowerCase();
                        if (movedown.ancestor('.section_action_menu') && movedownParentType == 'li') {
                            movedown.ancestor().remove();
                        } else {
                            movedown.remove();
                        }
                    }

// This section can be moved - add the class to indicate this to Y.DD.
                    sectionnode.addClass(CSS.SECTIONDRAGGABLE);
                }
            }
        }, this);
    },

/*
     * Drag-dropping related functions
     */
    drag_start: function(e) {
        // Get our drag object
        var drag = e.target;
        // This is the node that the user started to drag.
        var node = drag.get('node');
        // This is the container node that will follow the mouse around,
        // or during a keyboard drag and drop the original node.
        var dragnode = drag.get('dragNode');
        if (node === dragnode) {
            return;
        }
        // Creat a dummy structure of the outer elemnents for clean styles application
        var containernode = Y.Node.create('<' + M.course.format.get_containernode() +
                '></' + M.course.format.get_containernode() + '>');
        containernode.addClass(M.course.format.get_containerclass());
        var sectionnode = Y.Node.create('<' + M.course.format.get_sectionwrappernode() +
                '></' + M.course.format.get_sectionwrappernode() + '>');
        sectionnode.addClass(M.course.format.get_sectionwrapperclass());
        sectionnode.setStyle('margin', 0);
        sectionnode.setContent(node.get('innerHTML'));
        containernode.appendChild(sectionnode);
        dragnode.setContent(containernode);
        dragnode.addClass(CSS.COURSECONTENT);
    },

drag_dropmiss: function(e) {
        // Missed the target, but we assume the user intended to drop it
        // on the last last ghost node location, e.drag and e.drop should be
        // prepared by global_drag_dropmiss parent so simulate drop_hit(e).
        this.drop_hit(e);
    },

get_section_index: function(node) {
        var sectionlistselector = '.' + CSS.COURSECONTENT + ' ' + M.course.format.get_section_selector(Y),
            sectionList = Y.all(sectionlistselector),
            nodeIndex = sectionList.indexOf(node),
            zeroIndex = sectionList.indexOf(Y.one('#section-0'));

return (nodeIndex - zeroIndex);
    },

drop_hit: function(e) {
        var drag = e.drag;

// Get references to our nodes and their IDs.
        var dragnode = drag.get('node'),
            dragnodeid = Y.Moodle.core_course.util.section.getId(dragnode),
            loopstart = dragnodeid,

dropnodeindex = this.get_section_index(dragnode),
            loopend = dropnodeindex;

if (dragnodeid === dropnodeindex) {
            Y.log("Skipping move - same location moving " + dragnodeid + " to " + dropnodeindex, 'debug', 'moodle-course-dragdrop');
            return;
        }

Y.log("Moving from position " + dragnodeid + " to position " + dropnodeindex, 'debug', 'moodle-course-dragdrop');

if (loopstart > loopend) {
            // If we're going up, we need to swap the loop order
            // because loops can't go backwards.
            loopstart = dropnodeindex;
            loopend = dragnodeid;
        }

// Get the list of nodes.
        drag.get('dragNode').removeClass(CSS.COURSECONTENT);
        var sectionlist = Y.Node.all(this.sectionlistselector);

// Add a lightbox if it's not there.
        var lightbox = M.util.add_lightbox(Y, dragnode);

// Handle any variables which we must pass via AJAX.
        var params = {},
            pageparams = this.get('config').pageparams,
            varname;

for (varname in pageparams) {
            if (!pageparams.hasOwnProperty(varname)) {
                continue;
            }
            params[varname] = pageparams[varname];
        }

// Prepare request parameters
        params.sesskey = M.cfg.sesskey;
        params.courseId = this.get('courseid');
        params['class'] = 'section';
        params.field = 'move';
        params.id = dragnodeid;
        params.value = dropnodeindex;

// Perform the AJAX request.
        var uri = M.cfg.wwwroot + this.get('ajaxurl');
        Y.io(uri, {
            method: 'POST',
            data: params,
            on: {
                start: function() {
                    lightbox.show();
                },
                success: function(tid, response) {
                    // Update section titles, we can't simply swap them as
                    // they might have custom title
                    try {
                        var responsetext = Y.JSON.parse(response.responseText);
                        if (responsetext.error) {
                            new M.core.ajaxException(responsetext);
                        }
                        M.course.format.process_sections(Y, sectionlist, responsetext, loopstart, loopend);
                    } catch (e) {
                        // Ignore.
                    }

// Update all of the section IDs - first unset them, then set them
                    // to avoid duplicates in the DOM.
                    var index;

// Classic bubble sort algorithm is applied to the section
                    // nodes between original drag node location and the new one.
                    var swapped = false;
                    do {
                        swapped = false;
                        for (index = loopstart; index <= loopend; index++) {
                            if (Y.Moodle.core_course.util.section.getId(sectionlist.item(index - 1)) >
                                        Y.Moodle.core_course.util.section.getId(sectionlist.item(index))) {
                                Y.log("Swapping " + Y.Moodle.core_course.util.section.getId(sectionlist.item(index - 1)) +
                                        " with " + Y.Moodle.core_course.util.section.getId(sectionlist.item(index)));
                                // Swap section id.
                                var sectionid = sectionlist.item(index - 1).get('id');
                                sectionlist.item(index - 1).set('id', sectionlist.item(index).get('id'));
                                sectionlist.item(index).set('id', sectionid);

// See what format needs to swap.
                                M.course.format.swap_sections(Y, index - 1, index);

// Update flag.
                                swapped = true;
                            }
                            sectionlist.item(index).setAttribute('data-sectionid',
                                Y.Moodle.core_course.util.section.getId(sectionlist.item(index)));
                        }
                        loopend = loopend - 1;
                    } while (swapped);

window.setTimeout(function() {
                        lightbox.hide();
                    }, 250);

// Update course state.
                    M.course.coursebase.invoke_function('updateMovedSectionState');
                },

failure: function(tid, response) {
                    this.ajax_failure(response);
                    lightbox.hide();
                }
            },
            context: this
        });
    }

}, {
    NAME: 'course-dragdrop-section',
    ATTRS: {
        courseid: {
            value: null
        },
        ajaxurl: {
            value: 0
        },
        config: {
            value: 0
        }
    }
});

M.course = M.course || {};
M.course.init_section_dragdrop = function(params) {
    new DRAGSECTION(params);
};
/**
 * Resource drag and drop.
 *
 * @class M.course.dragdrop.resource
 * @constructor
 * @extends M.core.dragdrop
 */
var DRAGRESOURCE = function() {
    DRAGRESOURCE.superclass.constructor.apply(this, arguments);
};
Y.extend(DRAGRESOURCE, M.core.dragdrop, {
    initializer: function() {
        // Set group for parent class
        this.groups = ['resource'];
        this.samenodeclass = CSS.ACTIVITY;
        this.parentnodeclass = CSS.SECTION;

this.samenodelabel = {
            identifier: 'afterresource',
            component: 'moodle'
        };
        this.parentnodelabel = {
            identifier: 'totopofsection',
            component: 'moodle'
        };

// Go through all sections
        var sectionlistselector = M.course.format.get_section_selector(Y);
        if (sectionlistselector) {
            sectionlistselector = '.' + CSS.COURSECONTENT + ' ' + sectionlistselector;
            this.setup_for_section(sectionlistselector);

// Initialise drag & drop for all resources/activities
            var nodeselector = sectionlistselector.slice(CSS.COURSECONTENT.length + 2) + ' li.' + CSS.ACTIVITY;
            var del = new Y.DD.Delegate({
                container: '.' + CSS.COURSECONTENT,
                nodes: nodeselector,
                target: true,
                handles: ['.' + CSS.EDITINGMOVE],
                dragConfig: {groups: this.groups}
            });
            del.dd.plug(Y.Plugin.DDProxy, {
                // Don't move the node at the end of the drag
                moveOnEnd: false,
                cloneNode: true
            });
            del.dd.plug(Y.Plugin.DDConstrained, {
                // Keep it inside the .course-content
                constrain: '#' + CSS.PAGECONTENT
            });
            del.dd.plug(Y.Plugin.DDWinScroll);

M.course.coursebase.register_module(this);
            M.course.dragres = this;
        }
    },

/**
     * Apply dragdrop features to the specified selector or node that refers to section(s)
     *
     * @method setup_for_section
     * @param {String} baseselector The CSS selector or node to limit scope to
     */
    setup_for_section: function(baseselector) {
        Y.Node.all(baseselector).each(function(sectionnode) {
            var resources = sectionnode.one('.' + CSS.CONTENT + ' ul.' + CSS.SECTION);
            // See if resources ul exists, if not create one
            if (!resources) {
                resources = Y.Node.create('<ul></ul>');
                resources.addClass(CSS.SECTION);
                sectionnode.one('.' + CSS.CONTENT + ' div.' + CSS.SUMMARY).insert(resources, 'after');
            }
            resources.setAttribute('data-draggroups', this.groups.join(' '));
            // Define empty ul as droptarget, so that item could be moved to empty list
            new Y.DD.Drop({
                node: resources,
                groups: this.groups,
                padding: '20 0 20 0'
            });

// Initialise each resource/activity in this section
            this.setup_for_resource('#' + sectionnode.get('id') + ' li.' + CSS.ACTIVITY);
        }, this);
    },

/**
     * Apply dragdrop features to the specified selector or node that refers to resource(s)
     *
     * @method setup_for_resource
     * @param {String} baseselector The CSS selector or node to limit scope to
     */
    setup_for_resource: function(baseselector) {
        Y.Node.all(baseselector).each(function(resourcesnode) {
            var draggroups = resourcesnode.getData('draggroups');
            if (!draggroups) {
                // This Drop Node has not been set up. Configure it now.
                resourcesnode.setAttribute('data-draggroups', this.groups.join(' '));
                // Define empty ul as droptarget, so that item could be moved to empty list
                new Y.DD.Drop({
                    node: resourcesnode,
                    groups: this.groups,
                    padding: '20 0 20 0'
                });
            }

// Replace move icons
            var move = resourcesnode.one('a.' + CSS.EDITINGMOVE);
            if (move) {
                var sr = move.getData('sectionreturn');
                move.replace(this.get_drag_handle(M.util.get_string('movecoursemodule', 'moodle'),
                             CSS.EDITINGMOVE, CSS.ICONCLASS, true).setAttribute('data-sectionreturn', sr));
            }
        }, this);
    },

drag_start: function(e) {
        // Get our drag object
        var drag = e.target;
        if (drag.get('dragNode') === drag.get('node')) {
            // We do not want to modify the contents of the real node.
            // They will be the same during a keyboard drag and drop.
            return;
        }
        drag.get('dragNode').setContent(drag.get('node').get('innerHTML'));
        drag.get('dragNode').all('img.iconsmall').setStyle('vertical-align', 'baseline');
    },

drop_hit: function(e) {
        var drag = e.drag;
        // Get a reference to our drag node
        var dragnode = drag.get('node');
        var dropnode = e.drop.get('node');

// Add spinner if it not there
        var actionarea = dragnode.one(CSS.ACTIONAREA);
        var spinner = M.util.add_spinner(Y, actionarea);

var params = {};

// Handle any variables which we must pass back through to
        var pageparams = this.get('config').pageparams;
        var varname;
        for (varname in pageparams) {
            params[varname] = pageparams[varname];
        }

// Variables needed to update the course state.
        var cmid = Number(Y.Moodle.core_course.util.cm.getId(dragnode));
        var beforeid = null;

// Prepare request parameters
        params.sesskey = M.cfg.sesskey;
        params.courseId = this.get('courseid');
        params['class'] = 'resource';
        params.field = 'move';
        params.id = cmid;
        params.sectionId = Y.Moodle.core_course.util.section.getId(dropnode.ancestor(M.course.format.get_section_wrapper(Y), true));

if (dragnode.next()) {
            beforeid = Number(Y.Moodle.core_course.util.cm.getId(dragnode.next()));
            params.beforeId = beforeid;
        }

// Do AJAX request
        var uri = M.cfg.wwwroot + this.get('ajaxurl');

Y.io(uri, {
            method: 'POST',
            data: params,
            on: {
                start: function() {
                    this.lock_drag_handle(drag, CSS.EDITINGMOVE);
                    spinner.show();
                },
                success: function(tid, response) {
                    var responsetext = Y.JSON.parse(response.responseText);
                    // Update course state.
                    M.course.coursebase.invoke_function(
                        'updateMovedCmState',
                        {
                            cmid: cmid,
                            beforeid: beforeid,
                            visible: responsetext.visible,
                        }
                    );
                    // Set visibility in course content.
                    var params = {element: dragnode, visible: responsetext.visible};
                    M.course.coursebase.invoke_function('set_visibility_resource_ui', params);
                    this.unlock_drag_handle(drag, CSS.EDITINGMOVE);
                    window.setTimeout(function() {
                        spinner.hide();
                    }, 250);
                },
                failure: function(tid, response) {
                    this.ajax_failure(response);
                    this.unlock_drag_handle(drag, CSS.SECTIONHANDLE);
                    spinner.hide();
                    // TODO: revert nodes location
                }
            },
            context: this
        });
    }
}, {
    NAME: 'course-dragdrop-resource',
    ATTRS: {
        courseid: {
            value: null
        },
        ajaxurl: {
            value: 0
        },
        config: {
            value: 0
        }
    }
});

M.course = M.course || {};
M.course.init_resource_dragdrop = function(params) {
    new DRAGRESOURCE(params);
};

}, '@VERSION@', {
    "requires": [
        "base",
        "node",
        "io",
        "dom",
        "dd",
        "dd-scroll",
        "moodle-core-dragdrop",
        "moodle-core-notification",
        "moodle-course-coursebase",
        "moodle-course-util"
    ]
});

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