window.onload = function() {
var req = new XMLHttpRequest();

	var availableWidth = [ 500, 1024, 1400, 1920];
	var size=0; 
	var banner=document.getElementById("banner");
	while (window.innerWidth > availableWidth[size] && size < availableWidth.length-1 ) 
		size++;
	banner.src="Images/slider/slide1-"+availableWidth[size]+".jpg";

	var contact= document.getElementsByClassName("contact");
	var tit_curso = document.getElementsByClassName("titulo_curso");
	var desc_curso = document.getElementsByClassName("descripcion_curso");
	var list = document.getElementsByTagName("li");
	var overlay=document.getElementById('overlay-contact');
	var exit=document.getElementById('exit');
	var basicgrey=document.getElementById('basic-grey');
	var logo=document.getElementById('logo');
	var btnconsulta=document.getElementById('btnconsulta');
	var btnok=document.getElementById('ok');

	function curso_click(){ 
		for(var j =0; j < desc_curso.length; j++){
			if (desc_curso[j].getAttribute("title") == this.getAttribute("title")) {
				var child = this.firstElementChild;
				if(desc_curso[j].style.display=="block") {
					child.innerHTML = child.innerHTML.replace("-","+");
					desc_curso[j].style.display="none";
				} else {
					child.innerHTML = child.innerHTML.replace("+","-");
					desc_curso[j].style.display="block";
				}
			}
		}
	}
    overlay.onclick = function(){
		overlay.style.display="none";
		basicgrey.style.display="none";
	};
    exit.onclick=function(){
		overlay.style.display="none";
		basicgrey.style.display="none";
	};
	btnok.onclick=function(){
		var params="mail="+document.getElementById("suscribe").value;
		req.open("POST", "newsletter.php", true);
		req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		req.setRequestHeader("Content-length", params.length);
		req.setRequestHeader("Connection", "close");
		req.onreadystatechange=function(){
		if(req.readyState == 4 && req.status == 200)
			document.getElementById("respuestanewsletter").innerHTML=req.responseText; 
		};
		req.send(params);
	};
	btnconsulta.onclick=function(){
		if (btnconsulta.disabled) return;
		if (document.getElementById("name").value.length === 0 || document.getElementById("message").value.length<10) {
			document.getElementById("respuestacontacto").innerHTML="Por favor completa todos los campos"; 
			return;
		}
		document.getElementById("respuestacontacto").innerHTML="Enviando..."; 
		var params = "nombre="+document.getElementById("name").value;
		params=params+"&mail="+document.getElementById("email").value;
		params=params+"&consulta="+document.getElementById("message").value;
		req.open("POST", "contacto.php", true);
		req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		req.setRequestHeader("Content-length", params.length);
		req.setRequestHeader("Connection", "close");

		req.onreadystatechange=function(){
			if(req.readyState == 4 && req.status == 200)
				document.getElementById("respuestacontacto").innerHTML=req.responseText; 
				btnconsulta.value="Enviar";
				btnconsulta.disabled=false;
			};
		btnconsulta.value="Enviando....";
		btnconsulta.disabled=true;
		req.send(params);
	};
	var i=0;
	for(i =0; i < tit_curso.length; i++)
		tit_curso[i].onclick=curso_click;

	for(i =0; i < contact.length; i++)
		contact[i].onclick=showContact;

	for(i =0; i < list.length; i++)
		if(list[i].firstChild.tagName=="A")
			list[i].firstChild.addEventListener("click", function(e) {
			var target=document.getElementById(this.hash.replace("#",""));
			scrollToY(target.offsetTop, 1500, 'easeInOutQuint');
			if (this.hash=='#footer-outer')
				showContact(); 
			e.preventDefault();
			});

    function showContact() {
		basicgrey.style.display="block";
		overlay.style.display="block";
    }

    var startY=banner.scrollHeight;
	window.onscroll = function () {
        logo.style.opacity=1*(window.pageYOffset > startY ); //bool->int
    };

    var curImg=1;
    setInterval(slide, 8000);
	var distrib;
	if (window.innerWidth <= 890) { //distribuidoras
		var xhr = new XMLHttpRequest();
		xhr.open('GET', encodeURI('lista_distrib.php'));
		xhr.onload = function() {
		    if (xhr.status === 200) {
		        distrib=JSON.parse(xhr.responseText);
				var sel = document.createElement("select");
				var selProv= document.createElement("select");
				var selZona = document.createElement("select");
				var result= document.createElement("div");

				sel.id="pais";
				selProv.id="prov";
				selZona.id="zona";
				result.id="result";

				for (var country in distrib) {
					var opt = document.createElement("option");
					var node = document.createTextNode(country);
					opt.appendChild(node);
					sel.appendChild(opt);
				}
				sel.selectedIndex=-1;
				sel.onchange=changeCountry;
				selProv.onchange=changeProv;
				selZona.onchange=changeZona;

				document.getElementById("distribuidoras").appendChild(sel);
				document.getElementById("distribuidoras").appendChild(selProv);
				document.getElementById("distribuidoras").appendChild(selZona);
				document.getElementById("distribuidoras").appendChild(result);
		    }
		    else {
		        alert('Request failed.  Returned status of ' + xhr.status);
		    }
		};
		xhr.send();


	}
	function changeCountry() {
		var pais = document.getElementById("pais").value;
		var prov = document.getElementById("prov");
		var zona = document.getElementById("zona");
		zona.innerHTML="";
		prov.innerHTML="";
		if(distrib[pais] === undefined) return;

		for (var provincia in distrib[pais]) {
			var opt = document.createElement("option");
			var node = document.createTextNode(provincia);
			opt.appendChild(node);
			prov.appendChild(opt);
		}
		prov.selectedIndex=-1;

	}
	function changeProv() {
		var pais = document.getElementById("pais").value;
		var prov = document.getElementById("prov").value;
		var zona = document.getElementById("zona");
		prov.innerHTML="";
		zona.innerHTML="";
		if(distrib[pais] === undefined || distrib[pais][prov] === undefined) return;

		for (var zone in distrib[pais][prov]) {
			var opt = document.createElement("option");
			var node = document.createTextNode(zone);
			opt.appendChild(node);
			zona.appendChild(opt);
		}
		zona.selectedIndex=-1;
	}
	function changeZona() {
		var pais = document.getElementById("pais").value;
		var prov = document.getElementById("prov").value;
		var zona = document.getElementById("zona").value;
		var result = document.getElementById("result");
		result.innerHTML="";
		var z = distrib[pais][prov][zona];
		for (var distr in z ) {
			for (var p in z[distr]) {
				result.appendChild(document.createTextNode(p+":"+z[distr][p]));
				result.appendChild(document.createElement("br"));
			}
			result.appendChild(document.createElement("br"));
		}
	}
    function slide() {
        banner.className='transp';
        setTimeout(transp, 500);
        curImg++;
        if(curImg>5) curImg=1;
    }
    function transp() {
		banner.src="Images/slider/slide"+curImg+"-"+availableWidth[size]+".jpg";
        banner.removeAttribute('class');
    }
};