/**
 * @private
 */
Ext.define('Ext.exporter.file.ooxml.Relationships', {
    extend: 'Ext.exporter.file.ooxml.Xml',
 
    isRelationships: true,
    currentIndex: 1,
 
    config: {
        relationships: []
    },
 
    contentType: {
        contentType: 'application/vnd.openxmlformats-package.relationships+xml',
        partName: '/_rels/.rels'
    },
 
    tpl: [
        '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>',
        '<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">',
        '<tpl if="relationships"><tpl for="relationships.getRange()">{[values.render()]}</tpl></tpl>',
        '</Relationships>'
    ],
 
    collectFiles: function(files){
        if(this.getRelationships().length){
            files[this.getPath()] = this.render();
        }
    },
 
    applyRelationships: function(data, dataCollection){
        return this.checkCollection(data, dataCollection, 'Ext.exporter.file.ooxml.Relationship');
    },
 
    updateRelationships: function(collection, oldCollection){
        var me = this;
 
        if(oldCollection){
            oldCollection.un({
                add: me.updateIds,
                remove: me.updateIds,
                scope: me
            });
        }
        if(collection){
            collection.on({
                add: me.updateIds,
                remove: me.updateIds,
                scope: me
            });
        }
    },
 
    updateIds: function(items){
        var i, len, item;
 
        if(!items){
            return;
        }
        len = items.length;
        for(i = 0; i < len; i++){
            item = items.getAt(i);
            item.setId('rId' + (i + 1));
        }
    },
 
    /**
     * Convenience method to add relationships.
     * @param {Object/Array} config
     * @return {Ext.exporter.file.ooxml.Relationship/Ext.exporter.file.ooxml.Relationship[]}
     */
    addRelationship: function(config){
        return this.getRelationships().add(config || {});
    },
    removeRelationship: function(config){
        return this.getRelationships().remove(config);
    }
 
});