crsmanager.h

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#ifndef CRSMANAGER_H
#define CRSMANAGER_H
 
#include <QList>
#include <QMap>
#include <QObject>
#include <QPair>
#include <QString>
 
class SpatialReferenceSystem;
 
struct CRSInfo
{
    QString authName;       
    int     code = -1;      
    QString name;           
    QString type;           
    QString areaName;       
    bool    deprecated = false;
};
 
class CRSManager : public QObject
{
    Q_OBJECT
 
    Q_PROPERTY(int   totalCRSCount      READ totalCRSCount      CONSTANT)
    Q_PROPERTY(QStringList authorities  READ availableAuthorities CONSTANT)
 
public:
 
    static CRSManager &instance();
 
    // ----- Database queries ------------------------------------------------
 
    [[nodiscard]] QList<CRSInfo> queryDatabase(const QString &keyword = {},
                                               const QString &authority = {},
                                               bool includeDeprecated = false) const;
 
    [[nodiscard]] int totalCRSCount() const;
 
    [[nodiscard]] QStringList availableAuthorities() const;
 
    // ----- Factory ---------------------------------------------------------
 
    [[nodiscard]] SpatialReferenceSystem *createFromAuthCode(const QString &authName,
                                                             int code,
                                                             QObject *parent = nullptr) const;
 
    [[nodiscard]] SpatialReferenceSystem *createFromWktOrProj(const QString &wktOrProj,
                                                              QObject *parent = nullptr) const;
 
    [[nodiscard]] bool areSameCRS(const SpatialReferenceSystem &a,
                                  const SpatialReferenceSystem &b) const;
 
    // ----- Commonly used CRSes ---------------------------------------------
 
    [[nodiscard]] SpatialReferenceSystem *wgs84() const;
 
    [[nodiscard]] SpatialReferenceSystem *webMercator() const;
 
    // ----- Recent / favourites --------------------------------------------
 
    [[nodiscard]] QList<QPair<QString, int>> recentCRSes() const;
 
    void addRecentCRS(const QString &authName, int code);
 
    void clearRecentCRSes();
 
    void loadSettings();
 
    void saveSettings() const;
 
signals:
    void recentCRSesChanged();
 
private:
    explicit CRSManager(QObject *parent = nullptr);
    ~CRSManager() override;
 
    // Non-copyable singleton
    CRSManager(const CRSManager &)            = delete;
    CRSManager &operator=(const CRSManager &) = delete;
 
    void initBuiltins();
 
    SpatialReferenceSystem              *m_wgs84       = nullptr;
    SpatialReferenceSystem              *m_webMercator = nullptr;
    QList<QPair<QString, int>>           m_recentCRSes;
    static constexpr int                 MaxRecentCRSes = 20;
};
 
#endif // CRSMANAGER_H