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#include "operationrunner.h"

#include <errors.h>
#include <kdupdaterupdateoperationfactory.h>
#include <packagemanagercore.h>

#include <QMetaObject>

#include <iostream>

OperationRunner::OperationRunner(qint64 magicMarker, const QInstaller::OperationList &oldOperations)
    : m_core(new QInstaller::PackageManagerCore(magicMarker, oldOperations))
{
    // We need a package manager core as some operations expect them to be available.
}

OperationRunner::~OperationRunner()
{
    delete m_core;
}

int OperationRunner::runOperation(QStringList arguments, RunMode mode)
{
    int result = EXIT_FAILURE;
    try {
        const QString name = arguments.takeFirst();
        QScopedPointer<QInstaller::Operation> op(KDUpdater::UpdateOperationFactory::instance()
            .create(name));
        if (!op) {
            std::cerr << "Cannot instantiate operation: " << qPrintable(name) << std::endl;
            return EXIT_FAILURE;
        }

        if (QObject *const object = dynamic_cast<QObject*> (op.data())) {
            const QMetaObject *const mo = object->metaObject();
            if (mo->indexOfSignal(mo->normalizedSignature("outputTextChanged(QString)")) > -1)
                connect(object, SIGNAL(outputTextChanged(QString)), this, SLOT(print(QString)));
        }
        op->setArguments(arguments);
        op->setValue(QLatin1String("installer"), QVariant::fromValue(m_core));


        bool readyPerformed = false;
        if (mode == RunMode::Do)
            readyPerformed = op->performOperation();
        if (mode == RunMode::Undo)
            readyPerformed = op->undoOperation();

        if (readyPerformed) {
            result = EXIT_SUCCESS;
            std::cout << "Operation finished successfully." << std::endl;
        } else {
            std::cerr << "An error occurred while performing the operation: "
                << qPrintable(op->errorString()) << std::endl;
        }
    } catch (const QInstaller::Error &e) {
        std::cerr << qPrintable(e.message()) << std::endl;
    } catch (...) {
        std::cerr << "Unknown exception caught." << std::endl;
    }
    return result;
}

void OperationRunner::print(const QString &value)
{
    std::cout << qPrintable(value) << std::endl;
}