#include "proxyconnection.h"
#include "proxyjsonrpcclient.h"
#include "websocketconnection.h"
#include "remoteproxyconnection.h"

Q_LOGGING_CATEGORY(dcRemoteProxyClientConnection, "RemoteProxyClientConnection")
Q_LOGGING_CATEGORY(dcRemoteProxyClientConnectionTraffic, "RemoteProxyClientConnectionTraffic")

namespace remoteproxyclient {

RemoteProxyConnection::RemoteProxyConnection(const QUuid &clientUuid, const QString &clientName, QObject *parent) :
    QObject(parent),
    m_clientUuid(clientUuid),
    m_clientName(clientName)
{

}

RemoteProxyConnection::~RemoteProxyConnection()
{

}

RemoteProxyConnection::State RemoteProxyConnection::state() const
{
    return m_state;
}

RemoteProxyConnection::Error RemoteProxyConnection::error() const
{
    return m_error;
}

QString RemoteProxyConnection::errorString() const
{
    QString errorString;
    switch (m_error) {
    case ErrorNoError:
        errorString = "";
        break;
    case ErrorSocketError:
        errorString = "Socket connection error occured.";
        break;
    case ErrorSslError:
        errorString = "SSL error occured.";
        break;
    case ErrorProxyNotResponding:
        errorString = "The proxy server does not respond.";
        break;
    case ErrorProxyAuthenticationFailed:
        errorString = "The authentication on the proxy server failed.";
        break;
    }

    return errorString;
}

bool RemoteProxyConnection::isConnected() const
{
    return m_state == StateConnected
            || m_state == StateInitializing
            || m_state == StateReady
            || m_state == StateAuthenticating
            || m_state == StateWaitTunnel
            || m_state == StateRemoteConnected;
}

bool RemoteProxyConnection::isAuthenticated() const
{
    return m_state == StateWaitTunnel
            || m_state == StateRemoteConnected;
}

bool RemoteProxyConnection::isRemoteConnected() const
{
    return m_state == StateRemoteConnected;
}

RemoteProxyConnection::ConnectionType RemoteProxyConnection::connectionType() const
{
    return m_connectionType;
}

void RemoteProxyConnection::setConnectionType(RemoteProxyConnection::ConnectionType connectionType)
{
    m_connectionType = connectionType;
}

QHostAddress RemoteProxyConnection::serverAddress() const
{
    return m_serverAddress;
}

quint16 RemoteProxyConnection::serverPort() const
{
    return m_serverPort;
}

QString RemoteProxyConnection::serverName() const
{
    return m_serverName;
}

QString RemoteProxyConnection::proxyServerName() const
{
    return m_proxyServerName;
}

QString RemoteProxyConnection::proxyServerVersion() const
{
    return m_proxyServerVersion;
}

QString RemoteProxyConnection::proxyServerApiVersion() const
{
    return m_proxyServerApiVersion;
}

bool RemoteProxyConnection::insecureConnection() const
{
    return m_insecureConnection;
}

void RemoteProxyConnection::setInsecureConnection(bool insecureConnection)
{
    m_insecureConnection = insecureConnection;
}

bool RemoteProxyConnection::sendData(const QByteArray &data)
{
    if (!isConnected()) {
        qCWarning(dcRemoteProxyClientConnection()) << "Could not send data. Not connected.";
        return false;
    }

    if (!isRemoteConnected()) {
        qCWarning(dcRemoteProxyClientConnection()) << "Could not send data. The remote client is not connected yet.";
        return false;
    }

    m_connection->sendData(data);
    return true;
}

void RemoteProxyConnection::cleanUp()
{
    if (m_jsonClient) {
        m_jsonClient->deleteLater();
        m_jsonClient = nullptr;
    }

    if (m_connection) {
        m_connection->deleteLater();
        m_connection = nullptr;
    }

    m_serverName = QString();
    m_proxyServerName = QString();
    m_proxyServerVersion = QString();
    m_proxyServerApiVersion = QString();

    setState(StateDisconnected);
}

void RemoteProxyConnection::setState(RemoteProxyConnection::State state)
{
    if (m_state == state)
        return;

    m_state = state;
    qCDebug(dcRemoteProxyClientConnection()) << "State changed" << m_state;
    emit stateChanged(m_state);
}

void RemoteProxyConnection::setError(RemoteProxyConnection::Error error)
{
    if (m_error == error)
        return;

    m_error = error;
    qCDebug(dcRemoteProxyClientConnection()) << "Error occured" << m_error << errorString();
    emit errorOccured(m_error);
}

void RemoteProxyConnection::onConnectionChanged(bool isConnected)
{
    if (isConnected) {
        qCDebug(dcRemoteProxyClientConnection()) << "Connected from proxy server.";
        setState(StateConnected);
        emit connected();

        setState(StateInitializing);
        JsonReply *reply = m_jsonClient->callHello();
        connect(reply, &JsonReply::finished, this, &RemoteProxyConnection::onHelloFinished);
    } else {
        qCDebug(dcRemoteProxyClientConnection()) << "Disconnected from proxy server.";
        emit disconnected();
        setState(StateDisconnected);
        cleanUp();
    }
}

void RemoteProxyConnection::onConnectionDataAvailable(const QByteArray &data)
{
    switch (m_state) {
    case StateConnecting:
    case StateConnected:
    case StateInitializing:
    case StateReady:
    case StateAuthenticating:
    case StateWaitTunnel:
        m_jsonClient->processData(data);
        break;
    case StateRemoteConnected:
        // Remote data arrived
        emit dataReady(data);
        break;
    default:
        qCWarning(dcRemoteProxyClientConnection()) << "Unhandled: Data reviced" << data;
        break;
    }
}

void RemoteProxyConnection::onConnectionSocketError()
{
    setError(ErrorSocketError);
}

void RemoteProxyConnection::onConnectionSslError()
{
    setError(ErrorSslError);
}

void RemoteProxyConnection::onHelloFinished()
{
    JsonReply *reply = static_cast<JsonReply *>(sender());
    reply->deleteLater();

    QVariantMap response = reply->response();
    qCDebug(dcRemoteProxyClientConnectionTraffic()) << "Hello response ready" << reply->commandId() << response;

    if (response.value("status").toString() != "success") {
        qCWarning(dcRemoteProxyClientConnection()) << "Could not get initial information from proxy server.";
        m_connection->disconnectServer();
        return;
    }

    QVariantMap responseParams = response.value("params").toMap();

    // TODO: verify success

    m_serverName = responseParams.value("server").toString();
    m_proxyServerName = responseParams.value("name").toString();
    m_proxyServerVersion = responseParams.value("version").toString();
    m_proxyServerApiVersion = responseParams.value("apiVersion").toString();

    setState(StateReady);
    emit ready();
}

void RemoteProxyConnection::onAuthenticateFinished()
{
    JsonReply *reply = static_cast<JsonReply *>(sender());
    reply->deleteLater();

    QVariantMap response = reply->response();
    qCDebug(dcRemoteProxyClientConnectionTraffic()) << "Authentication response ready" << reply->commandId() << response;

    QVariantMap responseParams = response.value("params").toMap();
    if (responseParams.value("authenticationError").toString() != "AuthenticationErrorNoError") {
        qCWarning(dcRemoteProxyClientConnection()) << "Authentication request finished with error" << responseParams.value("authenticationError").toString();
        setError(RemoteProxyConnection::ErrorProxyAuthenticationFailed);
        m_connection->disconnectServer();
    } else {
        qCDebug(dcRemoteProxyClientConnection()) << "Successfully authenticated.";
        setState(StateWaitTunnel);
        emit authenticated();
    }
}

void RemoteProxyConnection::onTunnelEstablished(const QString &clientName, const QString &clientUuid)
{
    qCDebug(dcRemoteProxyClientConnection()) << "####### Remote connection established with" << clientName << clientUuid;
    setState(StateRemoteConnected);
    emit remoteConnectionEstablished();
}

bool RemoteProxyConnection::connectServer(const QHostAddress &serverAddress, quint16 port)
{    
    m_serverAddress = serverAddress;
    m_serverPort = port;
    m_error = ErrorNoError;

    cleanUp();

    switch (m_connectionType) {
    case ConnectionTypeWebSocket:
        m_connection = qobject_cast<ProxyConnection *>(new WebSocketConnection(this));
    }

    m_connection->setAllowSslErrors(m_insecureConnection);

    connect(m_connection, &ProxyConnection::connectedChanged, this, &RemoteProxyConnection::onConnectionChanged);
    connect(m_connection, &ProxyConnection::dataReceived, this, &RemoteProxyConnection::onConnectionDataAvailable);
    connect(m_connection, &ProxyConnection::errorOccured, this, &RemoteProxyConnection::onConnectionSocketError);
    connect(m_connection, &ProxyConnection::sslErrorOccured, this, &RemoteProxyConnection::onConnectionSslError);

    m_jsonClient = new JsonRpcClient(m_connection, this);
    connect(m_jsonClient, &JsonRpcClient::tunnelEstablished, this, &RemoteProxyConnection::onTunnelEstablished);

    qCDebug(dcRemoteProxyClientConnection()) << "Connecting to" << QString("%1:%2").arg(serverAddress.toString()).arg(port);
    m_connection->connectServer(serverAddress, port);

    setState(StateConnecting);

    return true;
}

bool RemoteProxyConnection::authenticate(const QString &token)
{
    if (m_state != StateReady) {
        qCWarning(dcRemoteProxyClientConnection()) << "Could not authenticate. The connection is not ready";
        return false;
    }

    setState(StateAuthenticating);

    qCDebug(dcRemoteProxyClientConnection()) << "Start authentication using token" << token;
    JsonReply *reply = m_jsonClient->callAuthenticate(m_clientUuid, m_clientName, token);
    connect(reply, &JsonReply::finished, this, &RemoteProxyConnection::onAuthenticateFinished);
    return true;
}

void RemoteProxyConnection::disconnectServer()
{
    if (m_connection) {
        qCDebug(dcRemoteProxyClientConnection()) << "Disconnecting from" << m_connection->serverUrl().toString();
        m_connection->disconnectServer();
    }
}

}