Capitalize background scripts

src/background/usecases/AddonEnabledUseCase.js

@@ -0,0 +1,29 @@
+import IndicatorPresenter from '../presenters/IndicatorPresenter';
+import TabPresenter from '../presenters/TabPresenter';
+import ContentMessageClient from '../infrastructures/ContentMessageClient';
+
+export default class AddonEnabledUseCase {
+  constructor() {
+    this.indicatorPresentor = new IndicatorPresenter();
+
+    this.indicatorPresentor.onClick(tab => this.onIndicatorClick(tab.id));
+
+    this.tabPresenter = new TabPresenter();
+    this.tabPresenter.onSelected(info => this.onTabSelected(info.tabId));
+
+    this.contentMessageClient = new ContentMessageClient();
+  }
+
+  indicate(enabled) {
+    return this.indicatorPresentor.indicate(enabled);
+  }
+
+  onIndicatorClick(tabId) {
+    return this.contentMessageClient.toggleAddonEnabled(tabId);
+  }
+
+  async onTabSelected(tabId) {
+    let enabled = await this.contentMessageClient.getAddonEnabled(tabId);
+    return this.indicatorPresentor.indicate(enabled);
+  }
+}