feat: Add settings page for providers (#353)

sources/providersConfig/ProviderInstanceFactory.hpp

@@ -0,0 +1,67 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <vector>
+
+#include <QHash>
+#include <QObject>
+#include <QString>
+#include <QStringList>
+
+#include "ProviderInstance.hpp"
+
+class QFileSystemWatcher;
+class QTimer;
+
+namespace QodeAssist::Providers {
+
+class ProviderInstanceFactory : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY_MOVE(ProviderInstanceFactory)
+public:
+    explicit ProviderInstanceFactory(QObject *parent = nullptr);
+    ~ProviderInstanceFactory() override;
+
+    void reload();
+
+    [[nodiscard]] static QString userInstancesDir();
+
+    [[nodiscard]] const ProviderInstance *instanceByName(const QString &name) const;
+    [[nodiscard]] QStringList instanceNames() const;
+    [[nodiscard]] QStringList instanceNamesForClientApi(const QString &clientApi) const;
+    [[nodiscard]] QStringList knownClientApis() const;
+    [[nodiscard]] const std::vector<ProviderInstance> &instances() const noexcept
+    {
+        return m_instances;
+    }
+
+    [[nodiscard]] QStringList lastLoadErrors() const { return m_errors; }
+    [[nodiscard]] QStringList lastLoadWarnings() const { return m_warnings; }
+
+    void registerInstance(ProviderInstance instance);
+    void clear();
+
+signals:
+    void instanceChanged(const QString &name);
+    void instancesReloaded();
+
+private:
+    void rewatchUserDir();
+    void rebuildIndexes();
+
+    std::vector<ProviderInstance> m_instances;
+    QHash<QString, qsizetype> m_nameIndex;
+    QStringList m_instanceNamesCache;
+    QStringList m_knownClientApisCache;
+    QStringList m_errors;
+    QStringList m_warnings;
+
+
+    QFileSystemWatcher *m_watcher = nullptr;
+    QTimer *m_reloadDebounce = nullptr;
+};
+
+} // namespace QodeAssist::Providers