#ifndef ALPM_DATABASE_H
#define ALPM_DATABASE_H

#include "./repository.h"

#include <QJsonArray>
#include <QMutex>
#include <QFuture>

#include <memory>

QT_FORWARD_DECLARE_CLASS(QNetworkRequest)

namespace RepoIndex {

class AlpmPackage;
class AlpmDatabase;
class LoadPackage;

enum class DatabaseError
{
    NoError,
    NotFound,
    NoAccess,
    UnableToOpenArchive,
    UnableToOpenDescFile,
    UnableToEnterDirectory
};

class AlpmPackageLoader : public PackageLoader
{
public:
    AlpmPackageLoader(AlpmDatabase *db, PackageOrigin origin);
    AlpmDatabase *database() const;
    DatabaseError error() const;

private:
    AlpmDatabase *const m_db;
    DatabaseError m_error;
    QList<QPair<QString, QList<QByteArray> > > m_descriptions;
};

/*!
 * \brief Returns the associated database.
 */
inline AlpmDatabase *AlpmPackageLoader::database() const
{
    return m_db;
}

/*!
 * \brief Returns the error status.
 */
inline DatabaseError AlpmPackageLoader::error() const
{
    return m_error;
}

class AlpmDatabase : public Repository
{
Q_OBJECT

    friend class AlpmPackageLoader;
public:
    explicit AlpmDatabase(const QString &name, const QString &dbPath, RepositoryUsage usage, SignatureLevel sigLevel, uint32 index = invalidIndex, QObject *parent = nullptr);
    AlpmPackageLoader *internalInit();

    RepositoryType type() const;
    PackageDetailAvailability requestsRequired(PackageDetail packageDetail) const;

    // database meta data
    const QString &databasePath() const;
    void setDatabasePath(const QString &dbPath);

    // updating/refreshing
    void downloadDatabase(const QString &targetDir, bool filesDatabase = true);
    void refresh(const QString &targetDir);

protected:
    std::unique_ptr<Package> emptyPackage();

private slots:
    void databaseDownloadFinished();

private:
    DatabaseError loadDescriptions(QList<QPair<QString, QList<QByteArray> > > &descriptions);
    QNetworkRequest regularDatabaseRequest();
    QNetworkRequest filesDatabaseRequest();

    QString m_dbPath;
    QString m_downloadTargetDir;
};

/*!
 * \brief Returns the path of the database directory/file.
 */
inline const QString &AlpmDatabase::databasePath() const
{
    return m_dbPath;
}

/*!
 * \brief Sets the path of the database directory/file.
 * \remarks Does not invoke reinitialization using the new path.
 */
inline void AlpmDatabase::setDatabasePath(const QString &dbPath)
{
    m_dbPath = dbPath;
}

} // namespace Alpm

#endif // ALPM_DATABASE_H