// Array Remove - By John Resig (MIT Licensed)
Array.prototype.remove = function(from, to) {
  var rest = this.slice((to || from) + 1 || this.length);
  this.length = from < 0 ? this.length + from : from;
  return this.push.apply(this, rest);
};

// Next Generation :
function OAjaxRequest () {};
OAjaxRequest.debug = false;
OAjaxRequest.xhrz = new Array();
OAjaxRequest.specificCallbackz = new Array();
OAjaxRequest.newRequest = function (script, datas, callback, method) {

	var _xhr = OAjaxRequest._getXHR();
	
	// Ajout à la liste des XHR :
	//alert('Ajout XHR :: script : '+script+', callback: '+callback);
	OAjaxRequest.xhrz.push(_xhr);
	OAjaxRequest.specificCallbackz.push(callback);
	
	// TODO :
	// AJout d'un timestamp sur l'URL sur script pour éviter les colisions !
	script += '?OAjaxRequestTimestamp='+(new Date()).getTime();
	
	_xhr.onreadystatechange = OAjaxRequest.callback;
	if (method == 'post') {
		_xhr.open('POST', script, true); 
		_xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');		
	} else {
		script += '&' + datas;
		_xhr.open('GET', script, true); 
	}	
	_xhr.send(datas);	
};

OAjaxRequest.unloadActivityChecker = function () {
	var existNotReady = false;
	for (var i=0; i<OAjaxRequest.xhrz.length; i++) {
		if (0<OAjaxRequest.xhrz[i].readyState && OAjaxRequest.xhrz[i].readyState<4) {
			existNotReady = true;
			break;
		}	
	}
	if (existNotReady) {
		return "Certaines opérations sont en cours de traitement. Il se peut que certaines actions n'aient pas été enregistrées.";
	}
};
window.onbeforeunload = OAjaxRequest.unloadActivityChecker;

OAjaxRequest.callback = function () {
	// Teste chaque objet XHR et résoud les cas ;
	// Si erreur : affiche une erreur, ou non.
	// Si ok, retrouve l'ID de l'objet Request et lance la fonction de callback spécifique
	// Quand requete finie, on supprime l'entrée de l'objet XhR dans la liste, ainsi que le lien vers la fonction spécifique
	for (var i=0; i<OAjaxRequest.xhrz.length; i++) {
		//alert('Début de boucle : '+i);
		if (OAjaxRequest.xhrz[i] == null) continue;
		var xhr = OAjaxRequest.xhrz[i];
		if (xhr.readyState == 4) {
			if ((xhr.status == 200) && xhr.responseText != '') {
				resp = xhr.responseText;
				//alert('Callback : '+OAjaxRequest.specificCallbackz[i]);
				if (OAjaxRequest.specificCallbackz[i] != null) {
					OAjaxRequest.xhrz.splice(i, 1);
					var callBackTemp = OAjaxRequest.specificCallbackz[i];
					OAjaxRequest.specificCallbackz.splice(i, 1);
					var ret = callBackTemp(resp);
				}
			} else {
				if (OAjaxRequest.debug)
					alert('Erreur : objet xhr_id: '+i+' ; callback : '+OAjaxRequest.specificCallbackz[i]);
				
				OAjaxRequest.xhrz.splice(i, 1);
				OAjaxRequest.specificCallbackz.splice(i, 1);
			}
		}
	}
};


OAjaxRequest._getXHR = function () {
	if (window.XMLHttpRequest) 
		var m_xhr = new XMLHttpRequest(); 
	else if (window.ActiveXObject) { 
		try { 
			var m_xhr = new ActiveXObject('Msxml2.XMLHTTP');
		} catch (e) { 
			var m_xhr = new ActiveXObject('Microsoft.XMLHTTP'); 
		} 
	} else { 
		alert('Votre navigateur ne supporte pas les objets XMLHTTPRequest, veuillez le mettre à jour'); 
		var m_xhr = false; 
	} 
	return m_xhr;
}

//////////////////////////////////////////////////////// OLD


// Unique pour toutes les commandes AJAX : eviter les redondances !
function getXhr() {
	if (window.XMLHttpRequest) 
		m_xhr = new XMLHttpRequest(); 
	else if (window.ActiveXObject) { 
		try { 
			m_xhr = new ActiveXObject('Msxml2.XMLHTTP');
		} catch (e) { 
			m_xhr = new ActiveXObject('Microsoft.XMLHTTP'); 
		} 
	} else { 
		alert('Votre navigateur ne supporte pas les objets XMLHTTPRequest, veuillez le mettre à jour'); 
		m_xhr = false; 
	} 
	return m_xhr;
}

var xhr = getXhr();

function ajax_send (script, datas, callback) {

	ajax_send_xhr(xhr, script, datas, callback);
}

function ajax_send_xhr (tXhr, script, datas, callback) {

	tXhr.onreadystatechange = callback;
	tXhr.open('POST', script, true); 
	tXhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
	tXhr.send(datas);
}

function ajax_send_get (script, callback) {

	ajax_send_xhr_get(xhr, script, callback);
}

function ajax_send_xhr_get (tXhr, script, callback) {

	tXhr.onreadystatechange = callback;
	tXhr.open('GET', script, true);
	tXhr.send(null);
}


function ajax_send_sync (script, datas, callback) {

	ajax_send_sync_xhr(xhr, script, datas, callback);
}

function ajax_send_sync_xhr (tXhr, script, datas, callback) {

	if (callback != null) tXhr.onreadystatechange = callback;
	tXhr.open('POST', script, false); 
	tXhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
	tXhr.send(datas);
}

/**
*
* Secure Hash Algorithm (SHA256)
* http://www.webtoolkit.info/
*
* Original code by Angel Marin, Paul Johnston.
*
**/

function SHA256(s){

    var chrsz = 8;
    var hexcase = 0;

    function safe_add (x, y) {
        var lsw = (x & 0xFFFF) + (y & 0xFFFF);
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
        return (msw << 16) | (lsw & 0xFFFF);
    }

    function S (X, n) { return ( X >>> n ) | (X << (32 - n)); }
    function R (X, n) { return ( X >>> n ); }
    function Ch(x, y, z) { return ((x & y) ^ ((~x) & z)); }
    function Maj(x, y, z) { return ((x & y) ^ (x & z) ^ (y & z)); }
    function Sigma0256(x) { return (S(x, 2) ^ S(x, 13) ^ S(x, 22)); }
    function Sigma1256(x) { return (S(x, 6) ^ S(x, 11) ^ S(x, 25)); }
    function Gamma0256(x) { return (S(x, 7) ^ S(x, 18) ^ R(x, 3)); }
    function Gamma1256(x) { return (S(x, 17) ^ S(x, 19) ^ R(x, 10)); }

    function core_sha256 (m, l) {
        var K = new Array(0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5, 0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174, 0xE49B69C1, 0xEFBE4786, 0xFC19DC6, 0x240CA1CC, 0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA, 0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7, 0xC6E00BF3, 0xD5A79147, 0x6CA6351, 0x14292967, 0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13, 0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85, 0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3, 0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070, 0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5, 0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3, 0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208, 0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2);
        var HASH = new Array(0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19);
        var W = new Array(64);
        var a, b, c, d, e, f, g, h, i, j;
        var T1, T2;

        m[l >> 5] |= 0x80 << (24 - l % 32);
        m[((l + 64 >> 9) << 4) + 15] = l;

        for ( var i = 0; i<m.length; i+=16 ) {
            a = HASH[0];
            b = HASH[1];
            c = HASH[2];
            d = HASH[3];
            e = HASH[4];
            f = HASH[5];
            g = HASH[6];
            h = HASH[7];

            for ( var j = 0; j<64; j++) {
                if (j < 16) W[j] = m[j + i];
                else W[j] = safe_add(safe_add(safe_add(Gamma1256(W[j - 2]), W[j - 7]), Gamma0256(W[j - 15])), W[j - 16]);

                T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(e, f, g)), K[j]), W[j]);
                T2 = safe_add(Sigma0256(a), Maj(a, b, c));

                h = g;
                g = f;
                f = e;
                e = safe_add(d, T1);
                d = c;
                c = b;
                b = a;
                a = safe_add(T1, T2);
            }

            HASH[0] = safe_add(a, HASH[0]);
            HASH[1] = safe_add(b, HASH[1]);
            HASH[2] = safe_add(c, HASH[2]);
            HASH[3] = safe_add(d, HASH[3]);
            HASH[4] = safe_add(e, HASH[4]);
            HASH[5] = safe_add(f, HASH[5]);
            HASH[6] = safe_add(g, HASH[6]);
            HASH[7] = safe_add(h, HASH[7]);
        }
        return HASH;
    }

    function str2binb (str) {
        var bin = Array();
        var mask = (1 << chrsz) - 1;
        for(var i = 0; i < str.length * chrsz; i += chrsz) {
            bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i%32);
        }
        return bin;
    }

    function Utf8Encode(str) {
		if (!isNaN(str)) return str;
		//alert('Str='+str);
        string = str.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    }

    function binb2hex (binarray) {
        var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
        var str = "";
        for(var i = 0; i < binarray.length * 4; i++) {
            str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
            hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
        }
        return str;
    }

    s = Utf8Encode(s);
    return binb2hex(core_sha256(str2binb(s), s.length * chrsz));

}