#ifndef ALPM_PACKAGE_H
#define ALPM_PACKAGE_H

#include "./list.h"

#include <c++utilities/chrono/datetime.h>

#include <alpm.h>

#include <QString>
#include <QHash>
#include <QJsonArray>

#include <map>

QT_FORWARD_DECLARE_CLASS(QJsonObject)
QT_FORWARD_DECLARE_CLASS(QJsonValue)

namespace RepoIndex {

class Repository;

/*!
 * \brief The PackageVersionComparsion enum defines possible results of packages version comparison.
 */
enum class PackageVersionComparsion
{
    Equal, /*!< The version of this package is the same as the version of the package from the sync db. */
    SoftwareUpgrade, /*!< The software version of the package from the sync db is newer.  */
    PackageUpgradeOnly, /*!< The package release number of the package from the sync db is newer. */
    NewerThenSyncVersion /*!< The version of this package is NEWER then the version of the package from the sync db. */
};

/*!
 * \brief The ComparsionResult enum defines possible results of package version part comparsion.
 */
enum class PackageVersionPartComparsion
{
    Equal, /*!< Both parts are equal. */
    Newer, /*!< Part 1 is newer then part 2. */
    Older /*!< Part 2 is newer then part 1. */
};

/*!
 * \brief The PackageOrigin enum describes where a Package instance comes from.
 */
enum class PackageOrigin
{
    Unknown = 20, /*! The origin is unknown. */
    File = ALPM_PKG_FROM_FILE, /*!< The instance has been created from a package file; source() returns nullptr in this case. */
    LocalDb = ALPM_PKG_FROM_LOCALDB, /*! The instance is from the local data base; source() is an AlpmDataBase instance. */
    SyncDb = ALPM_PKG_FROM_SYNCDB, /*! The instance is from a sync data base; source() is an AlpmDataBase instance. */
    Aur = 21 /*! The instance is from the AUR; source() is a UserRepository instance. */
};

enum class InstallStatus
{
    Explicit = ALPM_PKG_REASON_EXPLICIT,
    AsDependency = ALPM_PKG_REASON_DEPEND,
    None = 20
};

class PackageVersion
{
public:
    explicit PackageVersion(const QString &versionStr);

    static PackageVersionPartComparsion compareParts(const QString &part1, const QString &part2);
    PackageVersionComparsion compare(const PackageVersion &other) const;

    QString epoch;
    QString version;
    QString release;
};

class Dependency
{
public:
    explicit Dependency(const QString &name, const QString &version = QString(), _alpm_depmod_t mode = ALPM_DEP_MOD_ANY);
    QString name;
    QString version;
    _alpm_depmod_t mode;
};

inline Dependency::Dependency(const QString &name, const QString &version, _alpm_depmod_t mode) :
    name(name),
    version(version),
    mode(mode)
{}

class Manager;

class Package
{
public:
    virtual ~Package();

    // general package meta data
    PackageOrigin origin() const;
    Repository *source() const;
    bool hasGeneralInfo() const;
    const QString &name() const;
    const QString &version() const;
    const QString &description() const;
    const QString &upstreamUrl() const;
    const QStringList &licenses() const;
    const QStringList &groups() const;
    const QList<Dependency> &dependencies() const;
    const QList<Dependency> &optionalDependencies() const;
    const QList<Dependency> &conflicts() const;
    const QList<Dependency> &provides() const;
    const QList<Dependency> &replaces() const;
    bool isRequiredByComputed() const;
    void computeRequiredBy(Manager &manager);
    const QStringList &requiredBy() const;
    const QStringList &optionalFor() const;
    bool hasInstallScript() const;

    // build related meta data
    bool hasBuildRelatedMetaData() const;
    const QString &fileName() const;
    const QJsonArray &files() const;
    ChronoUtilities::DateTime buildDate() const;
    const QString &packer() const;
    const QString &md5() const;
    const QString &sha256() const;
    const QString &buildArchitecture() const;
    uint32 packageSize() const;
    const QList<Dependency> &makeDependencies() const;

    // installation related meta data
    bool hasInstallRelatedMetaData() const;
    ChronoUtilities::DateTime installDate() const;
    uint32 installedSize() const;
    const QStringList &backupFiles() const;
    alpm_pkgvalidation_t validationMethods() const;
    alpm_pkgreason_t installReason() const;

    // source related meta data
    bool hasSourceRelatedMetaData() const;
    const QString &baseName() const;
    const QStringList &architectures() const;
    int32 id() const;
    int32 categoryId() const;
    int32 votes() const;
    ChronoUtilities::DateTime outOfDate() const;
    const QString &maintainer() const;
    ChronoUtilities::DateTime firstSubmitted() const;
    ChronoUtilities::DateTime lastModified() const;
    const QString &tarUrl() const;
    const std::map<QString, QByteArray> &sourceFiles() const;

    // version comparsion
    PackageVersionComparsion compareVersion(const Package *syncPackage) const;
    PackageVersionComparsion compareVersion(const Dependency &dependency) const;
    static bool matches(const QString &name, const QString &version, const Dependency &dependency);
    bool matches(const Dependency &dependency);

    // JSON serialization
    QJsonObject basicInfo(bool includeRepoAndName = false) const;
    QJsonObject fullInfo(bool includeRepoAndName = false) const;

    // caching
    void writeToCacheStream(QDataStream &out);
    void restoreFromCacheStream(QDataStream &in);

protected:
    explicit Package(const QString &name, Repository *source);
    virtual void writeSpecificCacheHeader(QDataStream &out);
    virtual void restoreSpecificCacheHeader(QDataStream &in);

    PackageOrigin m_origin;
    Repository *m_source;

    // general package meta data
    bool m_hasGeneralInfo;
    QString m_name;
    QString m_version;
    QString m_description;
    QString m_upstreamUrl;
    QStringList m_licenses;
    QStringList m_groups;
    QList<Dependency> m_dependencies;
    QList<Dependency> m_optionalDependencies;
    QList<Dependency> m_conflicts;
    QList<Dependency> m_provides;
    QList<Dependency> m_replaces;
    bool m_requiredByComputed;
    QStringList m_requiredBy;
    QStringList m_optionalFor;
    bool m_hasInstallScript;

    // build related meta data
    bool m_hasBuildRelatedMetaData;
    QString m_fileName;
    QJsonArray m_files;
    ChronoUtilities::DateTime m_buildDate;
    QString m_packer;
    QString m_md5;
    QString m_sha256;
    QString m_buildArchitecture;
    uint32 m_packageSize;
    QList<Dependency> m_makeDependencies;

    // installation related meta data
    bool m_hasInstallRelatedMetaData;
    ChronoUtilities::DateTime m_installDate;
    uint32 m_installedSize;
    QStringList m_backupFiles;
    alpm_pkgvalidation_t m_validationMethods;
    alpm_pkgreason_t m_installReason;

    // source related meta data
    bool m_hasSourceRelatedMetaData;
    QString m_baseName;
    QStringList m_architectures;
    int32 m_id;
    int32 m_categoryId;
    int32 m_votes;
    ChronoUtilities::DateTime m_outOfDate;
    QString m_maintainer;
    ChronoUtilities::DateTime m_firstSubmitted;
    ChronoUtilities::DateTime m_lastModified;
    QString m_tarUrl;
    std::map<QString, QByteArray> m_sourceFiles;
};

/*!
 * \brief Returns where the package instance comes from (local db, sync db, pkg file, AUR).
 */
inline PackageOrigin Package::origin() const
{
    return m_origin;
}

/*!
 * \brief Returns the package source.
 * \remarks Might be nullptr if no source is associated.
 */
inline Repository *Package::source() const
{
    return m_source;
}

/*!
 * \brief Returns whether general information is available for the package.
 */
inline bool Package::hasGeneralInfo() const
{
    return m_hasGeneralInfo;
}

/*!
 * \brief Returns the name.
 */
inline const QString &Package::name() const
{
    return m_name;
}

/*!
 * \brief Returns the version.
 */
inline const QString &Package::version() const
{
    return m_version;
}

/*!
 * \brief Returns the description.
 */
inline const QString &Package::description() const
{
    return m_description;
}

/*!
 * \brief Returns the upstream URL.
 */
inline const QString &Package::upstreamUrl() const
{
    return m_upstreamUrl;
}

/*!
 * \brief Returns the licenses.
 */
inline const QStringList &Package::licenses() const
{
    return m_licenses;
}

/*!
 * \brief Returns the groups.
 */
inline const QStringList &Package::groups() const
{
    return m_groups;
}

/*!
 * \brief Returns the dependencies.
 */
inline const QList<Dependency> &Package::dependencies() const
{
    return m_dependencies;
}

/*!
 * \brief Returns the optional dependencies.
 */
inline const QList<Dependency> &Package::optionalDependencies() const
{
    return m_optionalDependencies;
}

/*!
 * \brief Returns conflicting packages.
 */
inline const QList<Dependency> &Package::conflicts() const
{
    return m_conflicts;
}

/*!
 * \brief Returns provides.
 */
inline const QList<Dependency> &Package::provides() const
{
    return m_provides;
}

/*!
 * \brief Returns packages which are replaced by this package.
 */
inline const QList<Dependency> &Package::replaces() const
{
    return m_replaces;
}

/*!
 * \brief Returns whether required-by and optional-for have been computed.
 */
inline bool Package::isRequiredByComputed() const
{
    return m_requiredByComputed;
}

/*!
 * \brief Returns packages requiring this packages.
 */
inline const QStringList &Package::requiredBy() const
{
    return m_requiredBy;
}

/*!
 * \brief Returns packages having this package as optional dependency.
 */
inline const QStringList &Package::optionalFor() const
{
    return m_optionalFor;
}

/*!
 * \brief Returns whether the package has an install script.
 */
inline bool Package::hasInstallScript() const
{
    return m_hasInstallScript;
}

/*!
 * \brief Returns whether the package has build-related meta data.
 *
 * Build-related meta data is information about a particular package file such
 * as architecture, file name, build date, ....
 */
inline bool Package::hasBuildRelatedMetaData() const
{
    return m_hasBuildRelatedMetaData;
}

/*!
 * \brief Returns the file name of the package file.
 */
inline const QString &Package::fileName() const
{
    return m_fileName;
}

/*!
 * \brief Returns the file of the package as JSON array.
 */
inline const QJsonArray &Package::files() const
{
    return m_files;
}

/*!
 * \brief Returns the build date of the package file.
 */
inline ChronoUtilities::DateTime Package::buildDate() const
{
    return m_buildDate;
}

/*!
 * \brief Returns the packer of the package file.
 */
inline const QString &Package::packer() const
{
    return m_packer;
}

/*!
 * \brief Returns the MD5 hash of the package file.
 */
inline const QString &Package::md5() const
{
    return m_md5;
}

/*!
 * \brief Returns the SHA-256 hash of the package file.
 */
inline const QString &Package::sha256() const
{
    return m_sha256;
}

/*!
 * \brief Returns the architecture of the package file.
 */
inline const QString &Package::buildArchitecture() const
{
    return m_buildArchitecture;
}

/*!
 * \brief Returns the size of the package file.
 */
inline uint32 Package::packageSize() const
{
    return m_packageSize;
}

/*!
 * \brief Returns make dependencies.
 */
inline const QList<Dependency> &Package::makeDependencies() const
{
    return m_makeDependencies;
}

/*!
 * \brief Returns whether install-related meta data is available.
 *
 * Install-related meta data is information such as the install date,
 * the installed size, files backuped during installation, ...
 *
 * Most of the install-related meta data is only available for packages
 * from the local data base (see origin()).
 */
inline bool Package::hasInstallRelatedMetaData() const
{
    return m_hasInstallRelatedMetaData;
}

/*!
 * \brief Returns the install date.
 */
inline ChronoUtilities::DateTime Package::installDate() const
{
    return m_installDate;
}

/*!
 * \brief Returns the installed size.
 */
inline uint32 Package::installedSize() const
{
    return m_installedSize;
}

/*!
 * \brief Returns the files which have been backued up during installation.
 */
inline const QStringList &Package::backupFiles() const
{
    return m_backupFiles;
}

/*!
 * \brief Returns the validation methods used during installation.
 */
inline alpm_pkgvalidation_t Package::validationMethods() const
{
    return m_validationMethods;
}

/*!
 * \brief Returns whether the package has been installed explicitely or as a dependency.
 */
inline alpm_pkgreason_t Package::installReason() const
{
    return m_installReason;
}

/*!
 * \brief Returns whether source-related meta data is available.
 *
 * Source-related meta data is information about the PKGBUILD file such has
 * its AUR IDs, AUR votes, maintainer, flag date, ...
 */
inline bool Package::hasSourceRelatedMetaData() const
{
    return m_hasSourceRelatedMetaData;
}

/*!
 * \brief Returns the base name.
 */
inline const QString &Package::baseName() const
{
    return m_baseName;
}

/*!
 * \brief Returns the architecutes (from the PKGBUILD file).
 * \remarks For the architecture of the particular package file
 *          see buildArchitecture().
 */
inline const QStringList &Package::architectures() const
{
    return m_architectures;
}

/*!
 * \brief Returns the ID.
 */
inline int32 Package::id() const
{
    return m_id;
}

/*!
 * \brief Returns the category ID.
 */
inline int32 Package::categoryId() const
{
    return m_categoryId;
}

/*!
 * \brief Returns the votes of the package.
 */
inline int32 Package::votes() const
{
    return m_votes;
}

/*!
 * \brief Returns the flag date.
 */
inline ChronoUtilities::DateTime Package::outOfDate() const
{
    return m_outOfDate;
}

/*!
 * \brief Returns the maintainer.
 */
inline const QString &Package::maintainer() const
{
    return m_maintainer;
}

/*!
 * \brief Returns when the package was first submitted.
 */
inline ChronoUtilities::DateTime Package::firstSubmitted() const
{
    return m_firstSubmitted;
}

/*!
 * \brief Returns the last time when the package was modified.
 */
inline ChronoUtilities::DateTime Package::lastModified() const
{
    return m_lastModified;
}

/*!
 * \brief Returns a URL to a tar file with the sources.
 */
inline const QString &Package::tarUrl() const
{
    return m_tarUrl;
}

/*!
 * \brief Returns the source files of the package.
 */
inline const std::map<QString, QByteArray> &Package::sourceFiles() const
{
    return m_sourceFiles;
}

/*!
 * \brief Compares the version of the package with the specified sync package.
 */
inline PackageVersionComparsion Package::compareVersion(const Package *syncPackage) const
{
    return PackageVersion(version()).compare(PackageVersion(syncPackage->version()));
}

/*!
 * \brief Compares the version of the package with the version of the specified \a dependency.
 */
inline PackageVersionComparsion Package::compareVersion(const Dependency &dependency) const
{
    return PackageVersion(version()).compare(PackageVersion(dependency.version));
}

/*!
 * \brief Checks whether the package matches the specified \a dependency.
 */
inline bool Package::matches(const Dependency &dependency)
{
    return matches(name(), version(), dependency);
}

}

#endif // ALPM_PACKAGE_H