Centralize legacy brush package import

src/app_core/brush_package_import.h

@@ -0,0 +1,56 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <string_view>
+
+namespace pp::app {
+
+enum class BrushPackageImportKind {
+    abr,
+    ppbr,
+};
+
+class BrushPackageImportServices {
+public:
+    virtual ~BrushPackageImportServices() = default;
+
+    virtual void import_brush_package(BrushPackageImportKind kind, std::string_view path) = 0;
+};
+
+[[nodiscard]] inline const char* brush_package_import_kind_name(BrushPackageImportKind kind) noexcept
+{
+    switch (kind) {
+    case BrushPackageImportKind::abr:
+        return "abr";
+    case BrushPackageImportKind::ppbr:
+        return "ppbr";
+    }
+
+    return "abr";
+}
+
+[[nodiscard]] inline pp::foundation::Status validate_brush_package_import_path(std::string_view path) noexcept
+{
+    if (path.empty()) {
+        return pp::foundation::Status::invalid_argument("brush package import path must not be empty");
+    }
+
+    return pp::foundation::Status::success();
+}
+
+[[nodiscard]] inline pp::foundation::Status execute_brush_package_import(
+    BrushPackageImportKind kind,
+    std::string_view path,
+    BrushPackageImportServices& services)
+{
+    const auto status = validate_brush_package_import_path(path);
+    if (!status.ok()) {
+        return status;
+    }
+
+    services.import_brush_package(kind, path);
+    return pp::foundation::Status::success();
+}
+
+} // namespace pp::app