Change project's name, heavy refactoring

src/main/java/ee/carlrobert/codegpt/ide/toolwindow/ContentManagerService.java

@@ -0,0 +1,56 @@
+package ee.carlrobert.codegpt.ide.toolwindow;
+
+import static java.util.Objects.requireNonNull;
+
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.wm.ToolWindowManager;
+import com.intellij.ui.content.Content;
+import com.intellij.ui.content.ContentFactory;
+import com.intellij.ui.content.ContentManager;
+import java.util.Arrays;
+import java.util.Optional;
+import javax.swing.JPanel;
+import org.jetbrains.annotations.NotNull;
+
+public class ContentManagerService {
+
+  private static ContentManagerService instance;
+  private final ContentManager contentManager;
+
+  private ContentManagerService(Project project) {
+    this.contentManager = requireNonNull(ToolWindowManager.getInstance(project).getToolWindow("CodeGPT")).getContentManager();
+  }
+
+  public static ContentManagerService getInstance(@NotNull Project project) {
+    if (instance == null) {
+      instance = new ContentManagerService(project);
+    }
+    return instance;
+  }
+
+  public void addContent(JPanel content, String displayName) {
+    contentManager.addContent(ApplicationManager.getApplication()
+        .getService(ContentFactory.class)
+        .createContent(content, displayName, false));
+  }
+
+  public void displayChatTab() {
+    tryFindChatTabContent().ifPresentOrElse(
+        contentManager::setSelectedContent,
+        () -> contentManager.setSelectedContent(requireNonNull(contentManager.getContent(0)))
+    );
+  }
+
+  public Optional<Content> tryFindChatTabContent() {
+    return Arrays.stream(contentManager.getContents())
+        .filter(content -> "Chat".equals(content.getTabName()))
+        .findFirst();
+  }
+
+  public boolean isChatTabSelected() {
+    return tryFindChatTabContent()
+        .filter(contentManager::isSelected)
+        .isPresent();
+  }
+}