define([
	
	"dojo/data/ItemFileWriteStore"
], function ( ItemFileWriteStore) {

    /* take a dynamic service's layerInfos Json and recursive subLayers 
	  a typical layerInfos Json is listed at the bottom
	*/

    function recursiveSubLayers(index, layerInfos) {
        var layerInfo = layerInfos[index];
        var dataStoreLayer = {};
        dataStoreLayer.name = layerInfo.name;
        dataStoreLayer.id = layerInfo.id;
        dataStoreLayer.visible = layerInfo.defaultVisibility;
        var children = [];
        var isGroupLayer;
        if ((layerInfo.subLayerIds !== null) && (layerInfo.subLayerIds.length > 0)) {
            dataStoreLayer.type = 'grouplayer';
            isGroupLayer = true;
        } else {
            dataStoreLayer.type = 'layer';
            isGroupLayer = false;
        }

        if (isGroupLayer) {
            for (var i = 0, len = layerInfo.subLayerIds.length; i < len; i++) {
                children.push(recursiveSubLayers(layerInfo.subLayerIds[i], layerInfos));
            }
            dataStoreLayer.children = children;
        }

        return dataStoreLayer;
    }

    /* for map layer does want to show sub layers
	* apply only to dynamic layer without sublayer
	* the input is a dynamic layer's layerinfos, the output is a store with nested nodes
	*/
    function adaptLayerInfoToDataStore(layerInfos) {
        var data = [];
        for (var i = 0, len = layerInfos.length; i < len; i++) {
            var layer;

            // if ( (layerInfos[i].subLayerIds !== null) && (layerInfos[i].subLayerIds.length>0) && (layerInfos[i].parentLayerId === -1) ){
            //   var layer=recursiveSubLayers(i, layerInfos);
            //   data.push(layer);
            // }

            if ((layerInfos[i].parentLayerId === -1)) {
                layer = recursiveSubLayers(i, layerInfos);
                data.push(layer);
            }
        }

        var storeData = {
            identifier: 'id',
            label: 'name',
            items: data
        };

        var store = new ItemFileWriteStore({ data: storeData });
        return store;
    }

    /* for map layer does not want to show sub layers
	* apply to dynamic layer, graphic layer, wms layer
	* Some times, even the layer is dynamic layers with sub layers, the requirement does not want to
	* display the sub layers
	* the input is a layer's information, the output is a store with single object
	* id could be any number because one layer tree only has one node, so the id is always unique
	*/
    function adaptLayerToDataStore(/*layer visibility*/visible, /*layer title*/title, /*a number to identify the tree node*/id) {
        var data = [];
        var dataStoreLayer = {};
        dataStoreLayer.name = title;
        dataStoreLayer.id = id;
        dataStoreLayer.visible = visible;
        dataStoreLayer.showSubLayers = false;
        data.push(dataStoreLayer);

        var storeData = {
            identifier: 'id',
            label: 'name',
            items: data
        };

        var store = new ItemFileWriteStore({ data: storeData });
        return store;
    }



    // function adaptGraphicLayerToDataStore(visible, title, id){
    //   var data=[];
    //   var dataStoreLayer={};
    //   dataStoreLayer.name=title;
    //   dataStoreLayer.id=id;
    //   dataStoreLayer.visible=visible; 
    //   dataStoreLayer.showSubLayers=false; 
    //   dataStoreLayer.layerType="graphic";
    //   data.push(dataStoreLayer);  
    //   var storeData= {
    //     identifier: 'id',
    //     label: 'name',
    //     items:  data
    //   };

    //   var store=new dojo.data.ItemFileWriteStore({data:storeData});
    //   return store;    
    // }



    // a typical layer's layerInfo structure
    // var layerInfos=
    //  [
    //     {
    //       "id": 0,
    //       "name": "Public Safety",
    //       "parentLayerId": -1,
    //       "defaultVisibility": true,
    //       "subLayerIds": [
    //         1,
    //         2,
    //         3,
    //         4,
    //         5,
    //         6,
    //         7,
    //         8
    //       ],
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 1,
    //       "name": "Fire Stations",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 50000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 2,
    //       "name": "Police Stations",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 50000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 3,
    //       "name": "Shelters",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 4,
    //       "name": "Schools",
    //       "parentLayerId": 0,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 5,
    //       "name": "Hospitals",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 50000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 6,
    //       "name": "Pet Collection Areas",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 7,
    //       "name": "Resources",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 8,
    //       "name": "Traffic Cameras",
    //       "parentLayerId": 0,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 9,
    //       "name": "Emergency Operations",
    //       "parentLayerId": -1,
    //       "defaultVisibility": true,
    //       "subLayerIds": [
    //         10
    //       ],
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 10,
    //       "name": "Event Information",
    //       "parentLayerId": 9,
    //       "defaultVisibility": true,
    //       "subLayerIds": [
    //         11,
    //         12,
    //         13,
    //         14,
    //         15,
    //         16,
    //         17,
    //         18,
    //         19,
    //         20,
    //         21
    //       ],
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 11,
    //       "name": "Event Grids",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 12,
    //       "name": "Damage Assessment",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 13,
    //       "name": "Road Blocks",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 14,
    //       "name": "Access Points",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 36000,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 15,
    //       "name": "Incident Point",
    //       "parentLayerId": 10,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 16,
    //       "name": "Incident Operations",
    //       "parentLayerId": 10,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 17,
    //       "name": "Incident Line",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 18,
    //       "name": "Incident Area",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 19,
    //       "name": "Evacuation Area",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 20,
    //       "name": "Exclusion Hot Zones",
    //       "parentLayerId": 10,
    //       "defaultVisibility": false,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     },
    //     {
    //       "id": 21,
    //       "name": "Plumes",
    //       "parentLayerId": 10,
    //       "defaultVisibility": true,
    //       "subLayerIds": null,
    //       "minScale": 0,
    //       "maxScale": 0
    //     }
    //   ];

    return {
        adaptLayerInfoToDataStore: adaptLayerInfoToDataStore,
        adaptLayerToDataStore: adaptLayerToDataStore
    };
});