Moved draft state for an entry (when in edit mode) to Redux

src/reducers/entryDraft.js

@@ -0,0 +1,34 @@
+import { Map, List } from 'immutable';
+import { DRAFT_CREATE, DRAFT_DISCARD, DRAFT_CHANGE, DRAFT_ADD_MEDIA, DRAFT_REMOVE_MEDIA } from '../actions/entries';
+
+const initialState = Map({entry: Map(), mediaFiles: List()});
+
+export function entryDraft(state = Map(), action) {
+  switch (action.type) {
+    case DRAFT_CREATE:
+      if (!action.payload) {
+        // New entry
+        return initialState;
+      }
+      // Existing Entry
+      return state.withMutations((state) => {
+        state.set('entry', action.payload);
+        state.set('mediaFiles', List());
+      });
+    case DRAFT_DISCARD:
+      return initialState;
+    case DRAFT_CHANGE:
+      return state.set('entry', action.payload);
+
+    case DRAFT_ADD_MEDIA:
+      return state.update('mediaFiles', (list) => list.push(action.payload));
+
+    case DRAFT_REMOVE_MEDIA:
+      const mediaIndex = state.get('mediaFiles').indexOf(action.payload);
+      if (mediaIndex === -1) return state;
+      return state.update('mediaFiles', (list) => list.splice(mediaIndex, 1));
+
+    default:
+      return state;
+  }
+}