define(['esri/layers/TiledMapServiceLayer',
        'esri/SpatialReference',
        'esri/geometry/Extent',
        'esri/layers/TileInfo',
        'dojo',
        "dojo/_base/lang",
        "dojo/on"
        ],
      function(TiledMapServiceLayer,
               SpatialReference,
               Extent,
               TileInfo,
               dojo,
               lang,
               on
               ){
          
        return dojo.declare("TianDiTuLayer", TiledMapServiceLayer, {
        	_mercatortype:"geo",//geo|mercator
        	url:"",
        	_layer:"",
        	displayLevels:[],//从0开始
        	_levelIndex:null,
        	_extentChangeHandler:null,
          constructor: function(mercatortype,url,layer,options) {
        	  this.mercatortype = mercatortype;
              this.url = url;
              this._layer = layer;
              this._tilematrixSet="";
              this.format="tiles",
              lang.mixin(this, options);
              if(this.displayLevels && this.displayLevels.length>0){
            	  this._levelIndex={};
            	  for(var i=0;i<this.displayLevels.length;i++){
            		  this._levelIndex[this.displayLevels[i]]=this.displayLevels[i];
            	  }
              }
        	 if(mercatortype == "geo")
    		 {
        		 this.spatialReference = new SpatialReference({ wkid:4326 });
                 this.initialExtent = (this.fullExtent = new Extent(-180.0, -90.0, 180.0, 90.0, this.spatialReference));
                 if(!this._tilematrixSet)
                 	this._tilematrixSet = "c";
                 this.tileInfo = new TileInfo({
                     "rows" : 256,
                     "cols" : 256,
                     "dpi" : 90.71428571428571,
                     "format" : "PNG32",
                     "compressionQuality" : 0,
                     "origin" : {
                       "x" : -180,
                       "y" : 90
                     },
                     "spatialReference" : {
                     "wkid" : 4326
                   },
                     "lods" : [
                       {"level" : 1, "resolution" : 0.703125, "scale" : 295497593.05875003},
                         {"level" : 2, "resolution" : 0.3515625, "scale" : 147748796.52937502},
                         {"level" : 3, "resolution" : 0.17578125, "scale" : 73874398.264687508},
                         {"level" : 4, "resolution" : 0.087890625, "scale" : 36937199.132343754},
                         {"level" : 5, "resolution" : 0.0439453125, "scale" : 18468599.566171877},
                         {"level" : 6, "resolution" : 0.02197265625, "scale" : 9234299.7830859385},
                         {"level" : 7, "resolution" : 0.010986328125, "scale" : 4617149.8915429693},
                         {"level" : 8, "resolution" : 0.0054931640625, "scale" : 2308574.9457714846},
                         {"level" : 9, "resolution" : 0.00274658203125, "scale" : 1154287.4728857423},
                         {"level" : 10, "resolution" : 0.001373291015625, "scale" : 577143.73644287116},
                         {"level" : 11, "resolution" : 0.0006866455078125, "scale" : 288571.86822143558},
                         {"level" : 12, "resolution" : 0.00034332275390625, "scale" : 144285.93411071779},
                         {"level" : 13, "resolution" : 0.000171661376953125, "scale" : 72142.967055358895},
                         {"level" : 14, "resolution" : 8.58306884765625e-005, "scale" : 36071.483527679447},
                         {"level" : 15, "resolution" : 4.291534423828125e-005, "scale" : 18035.741763839724},
                         {"level" : 16, "resolution" : 2.1457672119140625e-005, "scale" : 9017.8708819198619},
                         {"level" : 17, "resolution" : 1.0728836059570313e-005, "scale" : 4508.9354409599309},
                         {"level" : 18, "resolution" : 5.3644180297851563e-006, "scale" : 2254.4677204799655},
                         {"level" : 19, "resolution" : 0.000002682209014892578, "scale":1127.2338602399827}
                  //  {"level" : 20, "resolution" : 0.000001341104507446289, "scale":563.6169301199914}
                     ]
                   });
    		 }
        	 else
    		 {
        		 this.spatialReference = new SpatialReference({ wkid:3857 });
        		 this.fullExtent = this.initialExtent = new esri.geometry.Extent(-20037508.3427892,-20037508.3427892,20037508.3427892,20037508.3427892, new esri.SpatialReference({
       	          wkid: 3857
       	        }))
        		 if(!this._tilematrixSet)
        		 	this._tilematrixSet = "w";
        		 this.tileInfo = new esri.layers.TileInfo({
    		  		 "dpi": 96,   //必须，否则图错  90.71428571427429
    		          "rows" : 256,
    		            "cols" : 256,
    		            "compressionQuality" : 0,
    		            "origin" : {
    		              "x" : -20037508.3427892,
    		              "y" : 20037508.342787
    		            },
    		            "spatialReference" : {
    		              "wkid" : 3857
    		            },
    		            "lods" : [
    		              {"level" : 1, "resolution" : 78271.51696402048, "scale" :  2.958293554545656E8},
    		              {"level" : 2, "resolution" :  39135.75848201024, "scale" : 1.479146777272828E8},
    		              {"level" : 3, "resolution" : 19567.87924100512, "scale" : 7.39573388636414E7},
    		              {"level" : 4, "resolution" : 9783.93962050256, "scale" : 3.69786694318207E7},
    		              {"level" : 5, "resolution" : 4891.96981025128, "scale" : 1.848933471591035E7},
    		              {"level" : 6, "resolution" : 2445.98490512564, "scale" : 9244667.357955175},
    		              {"level" : 7, "resolution" : 1222.99245256282, "scale" : 4622333.678977588},
    		              {"level" : 8, "resolution" : 611.49622628141, "scale" : 2311166.839488794},
    		              {"level" : 9, "resolution" : 305.748113140705, "scale" : 1155583.419744397},
    		              {"level" : 10, "resolution" : 152.8740565703525, "scale" : 577791.7098721985},
    		              {"level" : 11, "resolution" : 76.43702828517625, "scale" : 288895.85493609926},
    		              {"level" : 12, "resolution" : 38.21851414258813, "scale" : 144447.92746804963},
    		              {"level" : 13, "resolution" : 19.109257071294063, "scale" : 72223.96373402482},
    		              {"level" : 14, "resolution" : 9.554628535647032, "scale" : 36111.98186701241},
    		              {"level" : 15, "resolution" : 4.777314267823516, "scale" : 18055.990933506204},
    		              {"level" : 16, "resolution" : 2.388657133911758, "scale" : 9027.995466753102},
    		              {"level" : 17, "resolution" :1.194328566955879, "scale" : 4513.997733376551},
    		              {"level" : 18, "resolution" :0.5971642834779395, "scale" : 2256.998866688275},
    		              {"level" : 19, "resolution" : 0.298582738909933, "scale": 1128.49943336487}
    					  // {"level" : 20, "resolution" : 0.1492913694549665, "scale": 564.249716682435}
    		              ]});
    		 }
            
            this.loaded = true;
            this.onLoad(this);
          },

          getTileUrl: function(level, row, col) {
              var url=
               this.url+"?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetTile&FORMAT="+this.format+"&TILEMATRIXSET="+this._tilematrixSet
               +"&STYLE=default&LAYER="
              +this._layer+"&TILEMATRIX="
              +(level)
              +"&TILEROW="
              +row
              +"&TILECOL="
              +col;
              
              return url;
      
           },
          setDisplayLevels:function(value)
          {
        	 this.displayLevels=value;
        	 this._levelIndex={};
        	 if(!this.displayLevels){
        		 this._levelIndex=null;
        		 return;
        	 }
        	 for(var i=0;i<this.displayLevels.length;i++){
       		  this._levelIndex[this.displayLevels[i]]=this.displayLevels[i];
       	  	}
          },
           _setMap: function(a, c, d, b) {
            var map=a;
            //控制显示级别
            this._extentChangeHandler = map.on("extent-change",lang.hitch(this,function(evt){
            	if(evt.levelChange){
            		if(this._levelIndex && !this._levelIndex[evt.lod.level])
			  		  	{
			      		  this.hide();
			  		  	}else
			  		  	{
			  		  		this.show();
			  		  	}
            	}
            }));
             return this.inherited(arguments);
           },
           _unsetMap: function(a, c) {
           	this._extentChangeHandler.remove();
            this.inherited(arguments);
           }
      });
});