function HermesFDAChrome(isChrome)
{
	this.states = { uninitialized : 0, notInstalled : 1, initializing : 2, initialized : 3, initializationFailed : 4 };
	
	// propiedades

	this.version = 0;
	this.state = this.states.uninitialized;
	this.lastErrorMessage = "";
	this.description = "";
	this.pinLength = 0;
	this.lastError = 0;
	this.lastLowLevelError = 0;
	this.pinModuleName = "";
	this.isPinMissing = false;
	this.isPinInvalid = false;
	this.pinRetryCount = 0;
	this.isChrome = isChrome;
	
	// eventos
	
	this.onCertificatesReady = null;
	this.onUpdated = null;
	this.onCertificateReady = null;
	this.onSignatureReady = null;
}

HermesFDAChrome.prototype.initialize = function (signature, domains, currentDomain, subjectNames)
{
	if (this.state != this.states.uninitialized)
	{
		return;
	}
	
	if (!this.isInstalled())
	{
		state = this.states.notInstalled;
		return;
	}
	
	// escuchar los mensajes de la extensión
	
	var outerThis = this;
	
	window.addEventListener
	(
		"message",
		function(event)
		{
			// Solo aceptar mensajes de la misma ventana
			
			if (event.source != window)
			{
	 
				return;
			}

			// Procesar las respuestas de la extensión

			if (event.data.type && (event.data.type == "HermesFDAResponse"))
			{
				outerThis.processExtensionMessage(event.data.text);
			}
		},
		false
	);
	
	this.state = this.states.initializing;
	
	// Pedir a la extensión que se inicialice.  Es necesario hacerlo por un timeout para esperar que la extensión enganche el evento onMessage
	
	window.setTimeout(
		function ()
		{
			var message = {command: 0, signature : signature, domains : domains, currentDomain : currentDomain, caSubjectNames : HermesFDACaSubjectNames};
			window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");
		},
		100
	);
}

HermesFDAChrome.prototype.isInstalled = function ()
{
	if (this.isChrome) {
		return this.version > 0 || this.detectChromeExtension("pcbdpnhgogngimbhngoanbkgpmoeiobj", "manifest.json");
	}
	else
	{
		return this.version > 0 || this.detectFirefoxExtension();
	}
}

HermesFDAChrome.prototype.getVersion = function ()
{
	return this.version;
}

HermesFDAChrome.prototype.detectChromeExtension = function(extensionId, accesibleResource)
{
	
    if (typeof(chrome) !== 'undefined')
    {
        try
        {
            var testUrl = 'chrome-extension://' +extensionId +'/' +accesibleResource;
            var result = $.ajax({ type: "GET", url: testUrl, async: false, cache: false, global: false});
            if (result.statusText == "OK")
            {
                var manifest = JSON.parse(result.responseText);
                this.version = parseFloat(manifest.version);
                this.description = manifest.description;
                return this.version > 0;
            }
        }
        catch(e)
        {
        }
    }
	return false;
}

HermesFDAChrome.prototype.detectFirefoxExtension = function () {

	try {
		var testUrl = window.localStorage.getItem("8847BAF82DEB47DA808A9D4E1C2B0C9A");
		if (testUrl == null || testUrl.length == 0)
		{
			return false;
		}
		var result = $.ajax({ type: "GET", url: testUrl, async: false, cache: false, global: false });
		if (result.statusText == "OK") {
			var manifest = JSON.parse(result.responseText);
			this.version = parseFloat(manifest.version);
			this.description = manifest.description;
			return this.version > 0;
		}
	}
	catch (e) {
	}
	return false;
}

HermesFDAChrome.prototype.processExtensionMessage = function (data)
{
	var extensionMessage = JSON.parse(data);
		
	if (this.state == this.states.initializing)
	{
		if (extensionMessage.command == 0) // inicializar
		{
			if (extensionMessage.error)
			{
				this.state = this.states.initializationFailed;
				this.lastErrorMessage = extensionMessage.errorMessage;
				this.lastError = extensionMessage.lastError;
				this.lastLowLevelError = extensionMessage.lastLowLevelError;
			}
			else
			{
				this.state = this.states.initialized;
			}
			
			// invocar evento generico que se llama cada vez que se actualiza el objeto
			
			if (this.onUpdated != null)
			{
				this.onUpdated(this);
			}
		}
	}
	else if (this.state == this.states.initialized)
	{
		// si es una respuesta diferente a inicializar entonces cargar los valores de los campos
		
		if (extensionMessage.command>0)
		{
			if (extensionMessage.error)
			{
				this.lastError = extensionMessage.lastError;
				this.lastErrorMessage = extensionMessage.errorMessage;
				this.lastLowLevelError = extensionMessage.lastLowLevelError;
			}
			else
			{
				this.lastError = 0;
				this.lastErrorMessage = "";
				this.lastLowLevelError = 0;
			}
			this.pinModuleName = extensionMessage.pinModuleName;
			this.isPinMissing = extensionMessage.missingPin;
			this.isPinInvalid = extensionMessage.invalidPin;
			this.pinLength = extensionMessage.pinLength;
			this.pinRetryCount = extensionMessage.pinRetryCount;

		    // invocar evento generico que se llama cada vez que se actualiza el objeto

			if (this.onUpdated != null) {
			    this.onUpdated(this, extensionMessage.command);
			}

			if (extensionMessage.command == 2) // lista de certificados
			{
				if (this.onCertificatesReady != null)
				{
					this.onCertificatesReady(this,extensionMessage.error?"":extensionMessage.certificates);
				}
			}
			else if (extensionMessage.command == 4) // certificado en base 64
			{
				if (this.onCertificateReady != null)
				{
					this.onCertificateReady(this,extensionMessage.error?"":extensionMessage.certificate);
				}
			}
			else if (extensionMessage.command == 5) // firma digital
			{
				if (this.onSignatureReady != null)
				{
					this.onSignatureReady(this,extensionMessage.error?"":extensionMessage.pkcs1);
				}
			}

		}
	}
}

HermesFDAChrome.prototype.processPinChar = function (char)
{
	if (this.state != this.states.initialized)
	{
		return;
	}
	
	var message = {command: 6, pinChar : char};
	
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");

	this.pinLength += 1;
}

HermesFDAChrome.prototype.deletePinChar = function ()
{
	if (this.state != this.states.initialized)
	{
		return;
	}
	
	var message = {command: 7};
	
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");

	if (this.pinLength > 0)
	{
		this.pinLength -= 1;
	}
}

HermesFDAChrome.prototype.getDigitalSignatureCertificates = function ()
{
	if (this.state != this.states.initialized)
	{
		return "";
	}
	var message = {command: 2};
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");
	return null;
}

HermesFDAChrome.prototype.getCertificate = function (certId)
{
	if (this.state != this.states.initialized)
	{
		return;
	}
	var message = {command: 4, certId: certId};
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");
	return null;
}

HermesFDAChrome.prototype.signPkcs1 = function(certId, digest)
{
	if (this.state != this.states.initialized)
	{
		return null;
	}
	var message = {command: 5, certId: certId, digest : digest };
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");
	return null;
}

// Activar el host de native messaging

function InitHermesFDAChrome()
{
	var message = { command: 1000 };
	window.postMessage({ type: "HermesFDARequest", text: JSON.stringify(message) }, "*");
}

InitHermesFDAChrome();