var JS_PHP_PROVIDER_URL='ebcbgdapi';function formatLocation(lat, lng) {
	return lat.toFixed(7) + (lat > 0 ? 'N' : 'S') +
		' ' + lng.toFixed(7) + (lng > 0 ? 'E' : 'W');
}

const C_AJAX_PROXY_ERR_RESEND_COUNT = 2;

function ajaxEbcSearchCb(xmlhttp, ok_cb) {

	try {
		/*
		readyState 	Holds the status of the XMLHttpRequest.
		0: request not initialized
		1: server connection established
		2: request received
		3: processing request
		4: request finished and response is ready
		*/
		if (xmlhttp.readyState == xmlhttp.DONE)
		{
			xmlhttp.t.setXObj.call(xmlhttp.t, xmlhttp.xobj_sel, null);
		
			if (xmlhttp.status == 200)
			{	
				if (ok_cb) {
					console.log('ajaxEbcSearchCb');
					ok_cb(xmlhttp);
				}
			} else if (xmlhttp.status == 502) {							
				EbcLogger.d('Resending ajax rq on status ' + xmlhttp.status + 'resendCounter: ' + xmlhttp.resendCounter, this, 'ajaxEbcSearchCb');
				if (xmlhttp.resendCounter != null && xmlhttp.resendCounter <= C_AJAX_PROXY_ERR_RESEND_COUNT && xmlhttp.resendCb) {
					xmlhttp.resendCb(xmlhttp);
				}
			}
			/*
			else
				console.log("Chyba AJAX " + xmlhttp.status);
			*/

			progress.hideProgress();

		}
	} catch (e) {
		console.log(e);
		console.log(xmlhttp.responseText);
		progress.hideProgress();
	}

}

function ajaxEbcSearchTimeoutCb(xmlhttp) {

	try {
		progress.hideProgress();		
	} catch (e) {
		console.log(e);
		console.log(xmlhttp.responseText);
	}

}

const SEARCH_MAX_ITEMS = 20;

function EbcSearch() {
	
	return {
		
		xmlhttp_search: null,
		xmlhttp_nearest_city: null,
		xmlhttp_nearest_chargers: null,

		options: {
	  		PARAM_COMMAND: "c",
	  		PARAM_COORD_X: "x",
	  		PARAM_COORD_Y: "y",
	  		PARAM_COORD_Z: "z",
	    	PARAM_SEARCH_TEXT: "t",
	    	PARAM_SEARCH_LATITUDE: "lat",
	    	PARAM_SEARCH_LONGITUDE: "lon",
			PARAM_SEARCH_FIND_PARAM: "fpar",
	    	PARAM_SEARCH_MARKER_TYPE: "marker_type",
	    	COMMAND_SEARCH_TEXT: "st",
	    	COMMAND_SEARCH_CITY: "sc",
	    	COMMAND_SEARCH_NEAREST: "snc",
	    	COMMAND_SEARCH_NEAREST_CITY: "snct",
	  		PHP_PROVIDER_URL: JS_PHP_PROVIDER_URL,
			X_SEL_SEARCH: 1,
			X_SEL_NEAREST_CITY: 2,
			X_SEL_NEAREST_CHARGERS: 3,
	  	},

		setXObj(sel, val) {
			switch (sel) {
				case this.options.X_SEL_SEARCH: this.xmlhttp_search = val; break;
				case this.options.X_SEL_NEAREST_CITY: this.xmlhttp_nearest_city = val; break;
				case this.options.X_SEL_NEAREST_CHARGERS: this.xmlhttp_nearest_chargers = val; break;
			}
		},

		getXObj(sel) {
			switch (sel) {
				case this.options.X_SEL_SEARCH: return this.xmlhttp_search; 
				case this.options.X_SEL_NEAREST_CITY: return this.xmlhttp_nearest_city; 
				case this.options.X_SEL_NEAREST_CHARGERS: return this.xmlhttp_nearest_chargers; 
				default: return null;
			}
		},
	  		
	  	initialize: function (cb, nearest_cb) { // (String)
	  	
	  		this._cb = cb;
	  		this._nearest_cb = nearest_cb;
			log('initialize');
	
	  	},
	  	
	  	_ajaxSendData: function (cb, url, params, xobj_sel, abort = true, direct = false, resendCounter = null) {
	  		if ((params) && (params.length > 0))
	  		{	  	
				if (abort && this.getXObj(xobj_sel)) {
					log('_ajaxSendData/abort...');
					try {
						this.getXObj(xobj_sel).abort();
						log('_ajaxSendData/abort ok');
					} catch (error) {
						log('_ajaxSendData/abort error');
					}
				}
					
	  			if (window.XMLHttpRequest)
	  			{
					this.setXObj(xobj_sel, new XMLHttpRequest());
	  			}
	  	 		else if (window.ActiveXObject)
	  			{
	  	 			try
	  	 			{
						this.setXObj(xobj_sel, new ActiveXObject("Msxml2.XMLHTTP"));
	  	 			}
	  	 			catch (error)
	  				{
						this.setXObj(xobj_sel, new ActiveXObject("Microsoft.XMLHTTP"));
	  				}
	  			}
	  	
				this.getXObj(xobj_sel).t = this;

	  			if (!this.getXObj(xobj_sel)) {
					log('_ajaxSendData/xmlhttp=null');
	  				return false;
				}
	  	
				let xmlhttp = this.getXObj(xobj_sel);

				// this.getXObj(xobj_sel).open("GET", url + '?' + params, true);
				xmlhttp.open("POST", url, true);
				xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	  	
	  			xmlhttp.onreadystatechange = function() { 
					if (xmlhttp.t.getXObj(xobj_sel) == xmlhttp) 
						xmlhttp.t.setXObj(xobj_sel, null);
					ajaxEbcSearchCb( xmlhttp, cb ); 
				};
				xmlhttp.ontimeout = function() { 
					if (xmlhttp.t.getXObj(xobj_sel) == xmlhttp) 
						xmlhttp.t.setXObj(xobj_sel, null);
					log('_ajaxSendData/ontimeout');
					ajaxEbcSearchTimeoutCb( xmlhttp ); 
				};
	  	
				xmlhttp.t = this;
				xmlhttp.cb = cb;
				xmlhttp.url = url;
				xmlhttp.params = params;
				xmlhttp.xobj_sel = xobj_sel;
				xmlhttp.abort_flg = abort;
				xmlhttp.direct = direct;
				xmlhttp.resendCounter = resendCounter == null ? 1 : resendCounter + 1;
				xmlhttp.resendCb = function (xmlhttp) { 
					xmlhttp.t._ajaxSendData.call(xmlhttp.t, cb, url, params, xobj_sel, abort, direct, resendCounter + 1) 
				};

				if (direct) {
					log('_ajaxSendData/direct send');
					xmlhttp.send(params);
				} else {
					setTimeout((x) => {
						if (x == xmlhttp.t.getXObj(xobj_sel)) {
							log('_ajaxSendData/delay send');
							xmlhttp.t.getXObj(xobj_sel).send(params);
						} else {
							ajaxEbcSearchTimeoutCb( x );
						}
					}, 200, xmlhttp);
				}

				progress.showProgress();
	  		}
	  		else
	  			return false;
	  	},
	  	
	  	_ajaxFormatParameter: function (name, value) {
			return encodeURIComponent(name) + "=" + encodeURIComponent(value);
	  	},
	
	  	_ajaxFormatParameters: function (params_arr) {
	  		let res = params_arr.length == 0 ? "" : params_arr[0];
	  		let i;
	  	
	  		for (i = 1; i < params_arr.length; i++)
	  		{
	  			res = res + "&" + params_arr[i];			
	  		}	
	  		return res;
	  	},
	  		
	  	sendSearchCityRq: function(text) { // city name  
	  		let params = this._ajaxFormatParameters(
	  			[
	  				this._ajaxFormatParameter(this.options.PARAM_COMMAND, this.options.COMMAND_SEARCH_CITY),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_TEXT, text)
	  			]
	  		);
	  	
	  		this._ajaxSendData(this._cb, this.options.PHP_PROVIDER_URL, params, this.options.X_SEL_SEARCH);
			//this._ajaxSendData(this._cb, 'https://nominatim.openstreetmap.org/search', 'city=' + text + '&format=json');
	
			log('sendSearchCityRq (' + text + ')'); 
	  	},	

		sendSearchNearestChargers: function(lat, lon, marker_type) {
	  		let params = this._ajaxFormatParameters(
	  			[
	  				this._ajaxFormatParameter(this.options.PARAM_COMMAND, this.options.COMMAND_SEARCH_NEAREST),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_LATITUDE, lat),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_LONGITUDE, lon),
					this._ajaxFormatParameter(this.options.PARAM_SEARCH_MARKER_TYPE, marker_type)
				]
	  		);
	  	
	  		this._ajaxSendData(this._nearest_cb, this.options.PHP_PROVIDER_URL, params, this.options.X_SEL_NEAREST_CHARGERS, true);
	
			log('sendSearchNearestChargers (' + lat + ', ' + lon + ')'); 			
		},	

		sendSearchNearestCity: function(lat, lon, cb, max = SEARCH_MAX_ITEMS) {
	  		let params = this._ajaxFormatParameters(
	  			[
	  				this._ajaxFormatParameter(this.options.PARAM_COMMAND, this.options.COMMAND_SEARCH_NEAREST_CITY),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_LATITUDE, lat),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_LONGITUDE, lon),
	  				this._ajaxFormatParameter(this.options.PARAM_SEARCH_FIND_PARAM, max)
	  			]
	  		);
	  	
	  		this._ajaxSendData(cb, this.options.PHP_PROVIDER_URL, params, this.options.X_SEL_NEAREST_CITY, false, true);
	
			log('sendSearchNearestCity (' + lat + ', ' + lon + ')'); 			
		},
			
	}
}