Initial commit

core/services/repository_manager.h

@@ -0,0 +1,90 @@
+// repository_manager.h
+#ifndef REPOSITORY_MANAGER_H
+#define REPOSITORY_MANAGER_H
+
+#include "repository_interface.h"
+
+#include <QMap>
+#include <QSqlDatabase>
+
+// The repository manager inherits the QObject class to delete child objects
+class RepositoryManager : public QObject {
+  Q_OBJECT
+
+private:
+  // Database connection
+  QSqlDatabase database_;
+
+  // Map of repository names to instances
+  QMap<QString, RepositoryInterface *> repositories_;
+
+public:
+  // Singleton instance accessor
+  static RepositoryManager &instance();
+
+  // Get a repository by name
+  RepositoryInterface *getRepository(const QString &repositoryTableName) const;
+
+  // Get a repository by name and type
+  template <typename T>
+  T *getRepositoryAs(const QString &repositoryTableName) const;
+
+private:
+  // Register a new repository
+  template <typename T>
+  bool registerRepository(const QString &repositoryTableName);
+
+  // Initialize repositories
+  void initialize();
+
+  // Private constructor for singleton
+  RepositoryManager();
+
+  // Destructor to clean up resources
+  ~RepositoryManager();
+
+  // Delete copy constructor
+  RepositoryManager(const RepositoryManager &) = delete;
+
+  // Delete assignment operator
+  RepositoryManager &operator=(const RepositoryManager &) = delete;
+};
+
+// NOTE: Implementation of template methods
+
+template <typename T>
+T *RepositoryManager::getRepositoryAs(
+    const QString &repositoryTableName) const {
+  auto *repository = dynamic_cast<T *>(getRepository(repositoryTableName));
+  if (!repository) {
+    qFatal() << "Failed to downcast repository for" << repositoryTableName
+             << "(typeid name):" << typeid(T).name();
+    return nullptr;
+  }
+  qInfo() << "Successfully downcast repository for" << repositoryTableName;
+  return repository;
+}
+
+template <typename T>
+bool RepositoryManager::registerRepository(const QString &repositoryTableName) {
+  static_assert(
+      std::is_constructible<T, QSqlDatabase &, QObject *>::value,
+      "Repository class must have a constructor accepting QSqlDatabase& and "
+      "QObject*");
+
+  if (repositories_.contains(repositoryTableName)) {
+    qInfo() << "Repository" << repositoryTableName << "is already registered";
+    return true;
+  }
+
+  auto *repository = new T(database_, this); // Qt will delete the model
+  repository->setObjectName(repositoryTableName);
+
+  repositories_.insert(repositoryTableName, repository);
+
+  qInfo() << "Repository" << repositoryTableName
+          << "was registered successfully";
+  return true;
+}
+
+#endif // REPOSITORY_MANAGER_H