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#ifndef INSTALLERCALCULATOR_H
#define INSTALLERCALCULATOR_H

#include "installer_global.h"
#include "qinstallerglobal.h"

#include <QHash>
#include <QList>
#include <QSet>
#include <QString>

namespace QInstaller {

class Component;

class INSTALLER_EXPORT InstallerCalculator
{
public:
    InstallerCalculator(PackageManagerCore *core, const QList<Component *> &allComponents, const AutoDependencyHash &autoDependencyComponentHash);

    enum InstallReasonType
    {
        Selected,   // "Selected Component(s) without Dependencies"
        Automatic, // "Component(s) added as automatic dependencies"
        Dependent, // "Added as dependency for %1."
        Resolved  // "Component(s) that have resolved Dependencies"
    };

    InstallReasonType installReasonType(const Component *c) const;
    QString installReason(const Component *component) const;
    QList<Component*> orderedComponentsToInstall() const;
    QString componentsToInstallError() const;

    bool appendComponentsToInstall(const QList<Component*> &components, bool modelReset = false, const bool revertFromInstall = false);
    bool removeComponentsFromInstall(const QList<Component*> &components);

private:
    QString installReasonReferencedComponent(const Component *component) const;
    void insertInstallReason(const Component *component,
                             const InstallReasonType installReason,
                             const QString &referencedComponentName = QString(),
                             const bool revertFromInstall = false);
    void realAppendToInstallComponents(Component *component, const QString &version, const bool revertFromInstall);
    bool appendComponentToInstall(Component *component, const QString &version, const bool revertFromInstall);
    QString recursionError(const Component *component) const;
    QSet<Component *> autodependencyComponents(const bool revertFromInstall);

private:
    PackageManagerCore *m_core;
    QList<Component*> m_allComponents;
    QHash<Component*, QSet<Component*> > m_visitedComponents;
    QList<const Component*> m_componentsForAutodepencencyCheck;
    //for faster lookups.
    QSet<QString> m_toInstallComponentIds;
    QHash<QString, QStringList> m_referenceCount;
    QString m_componentsToInstallError;
    //calculate installation order variables
    QList<Component*> m_orderedComponentsToInstall;
    //we can't use this reason hash as component id hash, because some reasons are ready before
    //the component is added
    QHash<QString, QPair<InstallReasonType, QString> > m_toInstallComponentIdReasonHash;
    //Helper hash for quicker search for autodependency components
    AutoDependencyHash m_autoDependencyComponentHash;
};

}


#endif // INSTALLERCALCULATOR_H
