refactor: native feature management (#2350)

packages/ui-services/src/Theme/GetAllThemesUseCase.ts

@@ -0,0 +1,29 @@
+import { FindNativeTheme, GetNativeThemes, ThemeFeatureDescription } from '@standardnotes/features'
+import { ComponentOrNativeFeature, ThemeInterface } from '@standardnotes/models'
+import { ItemManagerInterface } from '@standardnotes/services'
+
+export class GetAllThemesUseCase {
+  constructor(private readonly items: ItemManagerInterface) {}
+
+  execute(options: { excludeLayerable: boolean }): {
+    thirdParty: ComponentOrNativeFeature<ThemeFeatureDescription>[]
+    native: ComponentOrNativeFeature<ThemeFeatureDescription>[]
+  } {
+    const nativeThemes = GetNativeThemes().filter((feature) => (options.excludeLayerable ? !feature.layerable : true))
+
+    const allThirdPartyThemes = this.items
+      .getDisplayableComponents()
+      .filter(
+        (component) => component.isTheme() && FindNativeTheme(component.identifier) === undefined,
+      ) as ThemeInterface[]
+
+    const filteredThirdPartyThemes = allThirdPartyThemes.filter((theme) => {
+      return options.excludeLayerable ? !theme.layerable : true
+    })
+
+    return {
+      thirdParty: filteredThirdPartyThemes.map((theme) => new ComponentOrNativeFeature<ThemeFeatureDescription>(theme)),
+      native: nativeThemes.map((theme) => new ComponentOrNativeFeature(theme)),
+    }
+  }
+}