Add a global message queue that shows a snackbar.

src/MainRouter.tsx

@@ -10,10 +10,16 @@ import { routeResolver } from "./App";
 import SignupPage from "./SignupPage";
 import LoginPage from "./LoginPage";
 import WizardPage from "./WizardPage";
+import { Snackbar } from "@material-ui/core";
+import Alert from "@material-ui/lab/Alert";
+import { useSelector, useDispatch } from "react-redux";
+import { StoreState } from "./store";
+import { popMessage } from "./store/actions";
 
 
 export default function MainRouter() {
   return (
+    <>
       <Switch>
         <Route
           path={routeResolver.getRoute("signup")}
@@ -39,6 +45,31 @@ export default function MainRouter() {
           <SyncGate />
         </PrivateRoute>
       </Switch>
+      <GlobalMessages />
+    </>
+  );
+}
+
+function GlobalMessages() {
+  const dispatch = useDispatch();
+  const message = useSelector((state: StoreState) => state.messages.first(undefined));
+
+  function handleClose() {
+    dispatch(popMessage());
+  }
+
+  return (
+    <Snackbar
+      key={message?.message}
+      open={!!message}
+      autoHideDuration={5000}
+      onClose={handleClose}
+      anchorOrigin={{ vertical: "bottom", horizontal: "center" }}
+    >
+      <Alert onClose={handleClose} severity={message?.severity}>
+        {message?.message}
+      </Alert>
+    </Snackbar>
   );
 }
 

src/store/actions.ts

@@ -6,6 +6,7 @@ import { createAction as origCreateAction, ActionMeta } from "redux-actions";
 import * as Etebase from "etebase";
 
 import { SettingsType } from "./";
+import { Message } from "./reducers";
 
 type FunctionAny = (...args: any[]) => any;
 
@@ -166,6 +167,20 @@ export const clearErros = createAction(
   }
 );
 
+export const pushMessage = createAction(
+  "PUSH_MESSAGE",
+  (message: Message) => {
+    return message;
+  }
+);
+
+export const popMessage = createAction(
+  "POP_MESSAGE",
+  () => {
+    return true;
+  }
+);
+
 // FIXME: Move the rest to their own file
 export const setSettings = createAction(
   "SET_SETTINGS",

src/store/construct.ts

@@ -11,9 +11,9 @@ import * as Etebase from "etebase";
 import { List, Map as ImmutableMap } from "immutable";
 import {
   SettingsType,
-  fetchCount, credentials, settingsReducer, encryptionKeyReducer, errorsReducer,
+  fetchCount, credentials, settingsReducer, encryptionKeyReducer, errorsReducer, messagesReducer,
   syncGeneral, syncCollections, collections, items,
-  SyncGeneralData, SyncCollectionsData, CacheCollectionsData, CacheItemsData, CredentialsData,
+  SyncGeneralData, SyncCollectionsData, CacheCollectionsData, CacheItemsData, CredentialsData, Message,
 } from "./reducers";
 
 export interface StoreState {
@@ -30,6 +30,7 @@ export interface StoreState {
     items: CacheItemsData;
   };
   errors: List<Error>;
+  messages: List<Message>;
 }
 
 const settingsMigrations = {
@@ -135,6 +136,7 @@ const reducers = combineReducers({
     items,
   })),
   errors: errorsReducer,
+  messages: messagesReducer,
 });
 
 export default reducers;

src/store/reducers.ts

@@ -30,6 +30,11 @@ export type SyncGeneralData = {
   lastSyncDate: Date;
 };
 
+export type Message = {
+  message: string;
+  severity: "error" | "warning" | "info" | "success";
+};
+
 export interface CredentialsData {
   storedSession?: string;
 }
@@ -219,6 +224,18 @@ export const errorsReducer = handleActions(
   List([])
 );
 
+export const messagesReducer = handleActions(
+  {
+    [actions.pushMessage.toString()]: (state: List<Message>, action: Action<Message>) => {
+      return state.push(action.payload);
+    },
+    [actions.popMessage.toString()]: (state: List<Message>, _action: Action<unknown>) => {
+      return state.remove(0);
+    },
+  },
+  List([])
+);
+
 
 // FIXME Move all the below (potentially the fetchCount ones too) to their own file
 export interface SettingsType {