Add basic version of Comments component

app/javascript/reducers/currentPostReducer.ts

@@ -0,0 +1,86 @@
+import {
+  PostRequestActionTypes,
+  POST_REQUEST_START,
+  POST_REQUEST_SUCCESS,
+  POST_REQUEST_FAILURE,
+} from '../actions/requestPost';
+
+import {
+  ChangePostStatusSuccessAction,
+  CHANGE_POST_STATUS_SUCCESS,
+} from '../actions/changePostStatus';
+
+import {
+  CommentsRequestActionTypes,
+  COMMENTS_REQUEST_START,
+  COMMENTS_REQUEST_SUCCESS,
+  COMMENTS_REQUEST_FAILURE,
+} from '../actions/requestComments';
+
+import postReducer from './postReducer';
+import commentsReducer from './commentsReducer';
+
+import { CommentsState } from './commentsReducer';
+
+import IPost from '../interfaces/IPost';
+
+interface CurrentPostState {
+  item: IPost;
+  isLoading: boolean;
+  error: string;
+  comments: CommentsState;
+}
+
+const initialState: CurrentPostState = {
+  item: postReducer(undefined, {}),
+  isLoading: false,
+  error: '',
+  comments: commentsReducer(undefined, {}),
+};
+
+const currentPostReducer = (
+  state = initialState,
+  action: PostRequestActionTypes | ChangePostStatusSuccessAction | CommentsRequestActionTypes,
+): CurrentPostState => {
+  switch (action.type) {
+    case POST_REQUEST_START:
+      return {
+        ...state,
+        isLoading: true,
+      };
+
+    case POST_REQUEST_SUCCESS:
+      return {
+        ...state,
+        item: postReducer(undefined, action),
+        isLoading: false,
+        error: '',
+      };
+
+    case POST_REQUEST_FAILURE:
+      return {
+        ...state,
+        isLoading: false,
+        error: action.error,
+      };
+
+    case CHANGE_POST_STATUS_SUCCESS:
+      return {
+        ...state,
+        item: postReducer(state.item, action),
+      };
+
+    case COMMENTS_REQUEST_START:
+    case COMMENTS_REQUEST_SUCCESS:
+    case COMMENTS_REQUEST_FAILURE:
+      return {
+        ...state,
+        comments: commentsReducer(state.comments, action),
+      };
+
+    default:
+      return state;
+  }
+}
+
+export default currentPostReducer;