#include "connection.h"
#include "mainwindow.h"
#include "settings.h"
#include "ui_connection.h"
#include "firsttimewizard.h"
#include "ui_createzcashconfdialog.h"
#include "controller.h"


#include "../lib/zecwalletlitelib.h"

#include "precompiled.h"

using json = nlohmann::json;

ConnectionLoader::ConnectionLoader(MainWindow* main, Controller* rpc) {
    this->main = main;
    this->rpc  = rpc;

    d = new QDialog(main);
    connD = new Ui_ConnectionDialog();
    connD->setupUi(d);
    QPixmap logo(":/img/res/logobig.gif");
    connD->topIcon->setBasePixmap(logo.scaled(256, 256, Qt::KeepAspectRatio, Qt::SmoothTransformation));

    isSyncing = new QAtomicInteger<bool>();
}

ConnectionLoader::~ConnectionLoader() {
    delete isSyncing;
    delete connD;
    delete d;
}

void ConnectionLoader::loadConnection() {
    QTimer::singleShot(1, [=]() { this->doAutoConnect(); });
    if (!Settings::getInstance()->isHeadless())
        d->exec();
}

void ConnectionLoader::doAutoConnect() {
    qDebug() << "Doing autoconnect";

    auto config = std::shared_ptr<ConnectionConfig>(new ConnectionConfig());
    config->dangerous = true;
    config->server = Settings::getInstance()->getSettings().server;

    // Initialize the library
    main->logger->write(QObject::tr("Attempting to initialize library with ") + config->server);

    // Check to see if there's an existing wallet
    if (litelib_wallet_exists(Settings::getChainName().toStdString().c_str())) {
        main->logger->write(QObject::tr("Using existing wallet."));
        char* resp = litelib_initialize_existing(config->dangerous, config->server.toStdString().c_str());
        QString response = litelib_process_response(resp);

        if (response.toUpper().trimmed() != "OK") {
            showError(response);
            return;
        }
    } else {
        main->logger->write(QObject::tr("Create/restore wallet."));
        createOrRestore(config->dangerous, config->server);
        d->show();
    }    
    
    auto connection = makeConnection(config);
    auto me = this;

    // After the lib is initialized, try to do get info
    connection->doRPC("info", "", [=](auto) {
        // If success, set the connection
        main->logger->write("Connection is online.");

        isSyncing = new QAtomicInteger<bool>();
        isSyncing->store(true);

        // Do a sync at startup
        syncTimer = new QTimer(main);
        connection->doRPCWithDefaultErrorHandling("sync", "", [=](auto) {
            isSyncing->store(false);

            // Cancel the timer
            syncTimer->deleteLater();

            // When sync is done, set the connection
            this->doRPCSetConnection(connection);
        });
        
        // While it is syncing, we'll show the status updates while it is alive.
        QObject::connect(syncTimer, &QTimer::timeout, [=]() {
            // Check the sync status
            if (isSyncing != nullptr && isSyncing->load()) {
                // Get the sync status
                connection->doRPC("syncstatus", "", [=](json reply) {
                    if (isSyncing != nullptr && reply.find("synced_blocks") != reply.end()) {
                        qint64 synced = reply["synced_blocks"].get<json::number_unsigned_t>();
                        qint64 total = reply["total_blocks"].get<json::number_unsigned_t>();
                        me->showInformation("Synced " + QString::number(synced) + " / " + QString::number(total));
                    }
                },
                [=](QString err) {
                    qDebug() << "Sync error" << err;
                });
            }
        });   
        
        syncTimer->setInterval(1* 1000);
        syncTimer->start();

    }, [=](QString err) {
        showError(err);
    });
}

void ConnectionLoader::createOrRestore(bool dangerous, QString server) {
    // Close the startup dialog, since we'll be showing the wizard
    d->hide();

    // Create a wizard
    FirstTimeWizard wizard(dangerous, server);    

    wizard.exec();
}

void ConnectionLoader::doRPCSetConnection(Connection* conn) {
    qDebug() << "Connectionloader finished, setting connection";
    rpc->setConnection(conn);
    
    d->accept();

    QTimer::singleShot(1, [=]() { delete this; });
}

Connection* ConnectionLoader::makeConnection(std::shared_ptr<ConnectionConfig> config) {
    return new Connection(main, config);
}

// Update the UI with the status
void ConnectionLoader::showInformation(QString info, QString detail) {
    qDebug() << "Showing info " << info << ":" << detail;
    connD->status->setText(info);
    connD->statusDetail->setText(detail);
}

/**
 * Show error will close the loading dialog and show an error. 
*/
void ConnectionLoader::showError(QString explanation) {    
    rpc->noConnection();

    QMessageBox::critical(main, QObject::tr("Connection Error"), explanation, QMessageBox::Ok);
    d->close();
}

QString litelib_process_response(char* resp) {
    char* resp_copy = new char[strlen(resp) + 1];
    strcpy(resp_copy, resp);
    litelib_rust_free_string(resp);

    QString reply = QString::fromStdString(resp_copy);
    memset(resp_copy, '-', strlen(resp_copy));
    delete[] resp_copy;

    return reply;
}

/***********************************************************************************
 *  Connection, Executor and Callback Class
 ************************************************************************************/ 
void Executor::run() {
    char* resp = litelib_execute(this->cmd.toStdString().c_str(), this->args.toStdString().c_str());

    QString reply = litelib_process_response(resp);

    qDebug() << "RPC Reply=" << reply;
    auto parsed = json::parse(reply.toStdString().c_str(), nullptr, false);
    if (parsed.is_discarded() || parsed.is_null()) {
        emit handleError(reply);
    } else {
        emit responseReady(parsed);
    }
}


void Callback::processRPCCallback(json resp) {
    this->cb(resp);

    // Destroy self
    delete this;
}

void Callback::processError(QString resp) {
    this->errCb(resp);

    // Destroy self
    delete this;
}

Connection::Connection(MainWindow* m, std::shared_ptr<ConnectionConfig> conf) {
    this->config      = conf;
    this->main        = m;

    // Register the JSON type as a type that can be passed between signals and slots.
    qRegisterMetaType<json>("json");
}

void Connection::doRPC(const QString cmd, const QString args, const std::function<void(json)>& cb, 
                       const std::function<void(QString)>& errCb) {
    if (shutdownInProgress) {
        // Ignoring RPC because shutdown in progress
        return;
    }

    qDebug() << "Doing RPC: " << cmd;

    // Create a runner.
    auto runner = new Executor(cmd, args);

    // Callback object. Will delete itself
    auto c = new Callback(cb, errCb);

    QObject::connect(runner, &Executor::responseReady, c, &Callback::processRPCCallback);
    QObject::connect(runner, &Executor::handleError, c, &Callback::processError);

    QThreadPool::globalInstance()->start(runner);    
}

void Connection::doRPCWithDefaultErrorHandling(const QString cmd, const QString args, const std::function<void(json)>& cb) {
    doRPC(cmd, args, cb, [=] (QString err) {
        this->showTxError(err);
    });
}

void Connection::doRPCIgnoreError(const QString cmd, const QString args, const std::function<void(json)>& cb) {
    doRPC(cmd, args, cb, [=] (auto) {
        // Ignored error handling
    });
}

void Connection::showTxError(const QString& error) {
    if (error.isNull()) return;

    // Prevent multiple dialog boxes from showing, because they're all called async
    static bool shown = false;
    if (shown)
        return;

    shown = true;
    QMessageBox::critical(main, QObject::tr("Transaction Error"), QObject::tr("There was an error sending the transaction. The error was:") + "\n\n"
        + error, QMessageBox::StandardButton::Ok);
    shown = false;
}

/**
 * Prevent all future calls from going through
 */ 
void Connection::shutdown() {
    shutdownInProgress = true;
}
