Ajout notifications

frontend/src/reducers/messages.reducers.js

@@ -0,0 +1,32 @@
+import { ADD_MESSAGE, REMOVE_OLDEST_MESSAGE } from "../actions/message.actions";
+
+const initialState = {
+    sortedByTimestamp: []
+};
+
+export function messagesReducer(state = initialState, action) {
+    switch(action.type) {
+        case ADD_MESSAGE:
+            return handleAddMessage(state, action);
+        case REMOVE_OLDEST_MESSAGE:
+            return handleRemoveOldestMessage(state, action);
+    };
+    return state;
+}
+
+function handleAddMessage(state, action) {
+    return {
+        ...state,
+        sortedByTimestamp: [
+            { ts: Date.now(), text: action.text, type: action.messageType },
+            ...state.sortedByTimestamp
+        ]
+    }
+};
+
+function handleRemoveOldestMessage(state, action) {
+    return {
+        ...state,
+        sortedByTimestamp: state.sortedByTimestamp.slice(0, -1)
+    }
+};