var taille;
var poids;
var imc;
var classif;
var ideal = true;
var timer;
var timer2;

var decalImg = new Array(7);
decalImg[0] = 0;
decalImg[1] = 80;
decalImg[2] = 232;
decalImg[3] = 327;
decalImg[4] = 393;
decalImg[5] = 463;
decalImg[6] = 504;

var Imc = new Array(7);
Imc[0] = 6.4;
Imc[1] = 18.5;
Imc[2] = 25;
Imc[3] = 30;
Imc[4] = 35;
Imc[5] = 40;
Imc[6] = 147.928994083;

function calculIMC(poids, taille)
{
	return Math.round((poids/((taille*taille)/10000))*10)/10;
}

function calculPoids(taille, imc)
{
	return Math.round((imc*((taille*taille)/10000))*10)/10;
}

function Moyenne(nb1, nb2)
{
	return Math.round((nb1+nb2)/2);
}

function createRequestObject()
{
	var http;
	
	if(window.XMLHttpRequest)
	{
		http = new XMLHttpRequest();
		return http;
	}
	else if(window.ActiveXObject)
	{
		http = new ActiveXObject("Microsoft.XMLHTTP");
		return http;
	}
	else
	{
		return false;
	}
}

function EffaceConseils()
{
	document.getElementById('conseils').style.display='none';
	
	for(var i=0; i<=5; i++)
	{
		document.getElementById('conseil'+i).style.display='none';
	}
}

function calcEchelle(imc, classif)
{
	return decalImg[classif+1]-(((decalImg[classif+1]-decalImg[classif])*(Imc[classif+1]-imc))/(Imc[classif+1]-Imc[classif]));
}

function Log(p,t)
{
	http = createRequestObject();
	
	if(http != false)
	{
		http.open("GET", "/log.php?c=MTM0Mjk5MjA3NC4xMzI5ODM3ODA0&p="+p+"&t="+t, true);
		http.send(null);
	}
}

function afficheIMC()
{
	clearTimeout(timer);
	
	document.getElementById('messinfos').style.display='block';
	document.getElementById('poidsideal').style.display='none';
	document.getElementById('poidsparfait').style.display='none';
	//document.getElementById('fleche').style.visibility='hidden';
	document.getElementById('imc').value='???';
	
	EffaceConseils();
	
	taille = document.getElementById('taille').value;
	poids = document.getElementById('poids').value;
	
	clearTimeout(timer2);
	
	if(taille >= 130 && taille <= 250 &&
		poids >= 40 && poids <= 250)
	{	
		imc = calculIMC(poids, taille);
		document.getElementById('imc').value=imc;
		document.getElementById('messinfos').style.display='none';
		
		if(imc < Imc[1])
		{
			classif = 0;
		}
		else if(imc < Imc[2])
		{
			classif = 1;
		}
		else if(imc < Imc[3])
		{
			classif = 2;
		}
		else if(imc < Imc[4])
		{
			classif = 3;
		}
		else if(imc < Imc[5])
		{
			classif = 4;
		}
		else
		{
			classif = 5;
		}
		
		//document.getElementById('fleche').style.visibility='visible';
		document.getElementById('fleche').style.paddingTop = calcEchelle(imc,classif)-15 + 'px';
		document.getElementById('conseils').style.display='block';
		document.getElementById('conseil'+classif).style.display='block';
		
		if (classif != 1)
		{
			document.getElementById('poidsidealmin').innerHTML = calculPoids(taille, Imc[1]);
			document.getElementById('poidsidealmax').innerHTML = calculPoids(taille, Imc[2]);
			document.getElementById('poidsidealval').innerHTML = Moyenne(calculPoids(taille, Imc[1]), calculPoids(taille, Imc[2])) + ' kg';
			document.getElementById('poidsideal').style.display='block';
		}
		else
		{
			document.getElementById('poidsparfait').style.display='block';
		}
		
		timer = setTimeout("Log("+poids+","+taille+")",1000);
	}
	else
	{
		document.getElementById('messinfos').innerHTML = 'Veuillez indiquer correctement votre taille et votre poids.';
		
		timer2 = setTimeout("flecheUpDown()",200);
	}
}

var flecheUpDownPos=decalImg[0];
var flecheUpDownSens=1;

function flecheUpDown()
{
	flecheUpDownPos+=30*flecheUpDownSens;
				
	if(flecheUpDownPos>decalImg[6])
	{
		flecheUpDownPos=decalImg[6];
		flecheUpDownSens=-1;
	}
	else
	{
		if(flecheUpDownPos<decalImg[0])
		{
			flecheUpDownPos=decalImg[0];
			flecheUpDownSens=1;
		}
	}
	
	//document.getElementById('fleche').style.visibility='visible';
	document.getElementById('fleche').style.paddingTop = flecheUpDownPos-15 + 'px';
	
	timer2 = setTimeout("flecheUpDown()",200);
}