#include <QCoreApplication>
#include <QJsonArray>
#include <QJsonObject>
#include <QLocale>
#include <QSettings>
#include <QSignalSpy>
#include <QTemporaryDir>
#include <QtTest>

#include "context.h"
#include "data/permission.h"
#include "data/role.h"
#include "data/user.h"
#include "imetadataplugin.h"
#include "permissionevaluator.h"

class CoreTests : public QObject
{
    Q_OBJECT

private slots:
    void init()
    {
        Context::instance().setCurrentUser({});
    }

    void cleanup()
    {
        Context::instance().setCurrentUser({});
    }

    void metadataRejectsMissingObject()
    {
        QVERIFY(!IMetaDataPlugin::loadBaseMetaData({}));
        QVERIFY(!IMetaDataPlugin::loadBaseMetaData(QJsonObject{{"MetaData", QStringLiteral("invalid")}}));
    }

    void metadataUsesDefaultLocaleAndExtractsSchema()
    {
        const QJsonObject metadata{
            {"id", QStringLiteral("EXAMPLE")},
            {"schemaVersion", 2},
            {"name", QJsonObject{{"default", QStringLiteral("Example plugin")}}},
            {"description", QJsonObject{{"default", QStringLiteral("Example description")}}},
            {"sql", QJsonArray{QStringLiteral("CREATE TABLE example (id INTEGER)")}},
            {"dependencies", QJsonArray{QStringLiteral("CORE")}}
        };

        const MetaDataPtr result = IMetaDataPlugin::loadBaseMetaData(QJsonObject{{"MetaData", metadata}});

        QVERIFY(result);
        QCOMPARE(result->getId(), QStringLiteral("EXAMPLE"));
        QCOMPARE(result->getName(), QStringLiteral("Example plugin"));
        QCOMPARE(result->getDescription(), QStringLiteral("Example description"));
        QCOMPARE(result->getSchemaVersion(), 2);
        QCOMPARE(result->getSchemas(), QStringList{QStringLiteral("CREATE TABLE example (id INTEGER)")});
        QCOMPARE(result->getDependsOn(), QStringList{QStringLiteral("CORE")});
    }

    void metadataPrefersSystemLocale()
    {
        const QString locale = QLocale::system().name();
        const QJsonObject metadata{
            {"id", QStringLiteral("LOCALIZED")},
            {"name", QJsonObject{{"default", QStringLiteral("Fallback")}, {locale, QStringLiteral("Localized")}}},
            {"description", QJsonObject{{"default", QStringLiteral("Fallback description")}}}
        };

        const MetaDataPtr result = IMetaDataPlugin::loadBaseMetaData(QJsonObject{{"MetaData", metadata}});

        QVERIFY(result);
        QCOMPARE(result->getName(), QStringLiteral("Localized"));
        QCOMPARE(result->getDescription(), QStringLiteral("Fallback description"));
    }

    void permissionDeniedWithoutUser()
    {
        PermissionEvaluator evaluator;
        QSignalSpy denied(&evaluator, &PermissionEvaluator::permissionDenied);

        QVERIFY(!evaluator.hasPermission(QStringLiteral("SHOP"), QStringLiteral("READ")));
        QCOMPARE(denied.count(), 0);
    }

    void administratorBypassesPermissionLookup()
    {
        auto user = QSharedPointer<User>::create();
        user->setIsAdmin(true);
        Context::instance().setCurrentUser(user);

        PermissionEvaluator evaluator;
        QSignalSpy denied(&evaluator, &PermissionEvaluator::permissionDenied);

        QVERIFY(evaluator.hasPermission(QStringLiteral("SHOP"), QStringLiteral("DELETE")));
        QCOMPARE(denied.count(), 0);
    }

    void matchingRolePermissionIsGranted()
    {
        auto permission = QSharedPointer<Permission>::create();
        permission->setPluginId(QStringLiteral("SHOP"));
        permission->setPermissionName(QStringLiteral("READ"));

        auto role = QSharedPointer<Role>::create();
        role->addPermission(permission);

        auto user = QSharedPointer<User>::create();
        user->setIsAdmin(false);
        user->addRole(role);
        Context::instance().setCurrentUser(user);

        PermissionEvaluator evaluator;
        QSignalSpy denied(&evaluator, &PermissionEvaluator::permissionDenied);

        QVERIFY(evaluator.hasPermission(QStringLiteral("SHOP"), QStringLiteral("READ")));
        QCOMPARE(denied.count(), 0);
    }

    void mismatchedPermissionIsDeniedAndEmitsSignal()
    {
        auto permission = QSharedPointer<Permission>::create();
        permission->setPluginId(QStringLiteral("SHOP"));
        permission->setPermissionName(QStringLiteral("READ"));

        auto role = QSharedPointer<Role>::create();
        role->addPermission(permission);

        auto user = QSharedPointer<User>::create();
        user->setIsAdmin(false);
        user->addRole(role);
        Context::instance().setCurrentUser(user);

        PermissionEvaluator evaluator;
        QSignalSpy denied(&evaluator, &PermissionEvaluator::permissionDenied);

        QVERIFY(!evaluator.hasPermission(QStringLiteral("SHOP"), QStringLiteral("DELETE")));
        QCOMPARE(denied.count(), 1);
        QCOMPARE(denied.takeFirst().at(0).toString(), QStringLiteral("DELETE"));
    }
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QTemporaryDir settingsDirectory;
    if (!settingsDirectory.isValid()) {
        return 1;
    }

    QSettings::setDefaultFormat(QSettings::IniFormat);
    QSettings::setPath(QSettings::IniFormat, QSettings::UserScope, settingsDirectory.path());

    CoreTests tests;
    return QTest::qExec(&tests, argc, argv);
}

#include "core_tests.moc"