Refactoring redux state into different reducers

app/assets/javascripts/components/reducers/statuses.jsx

@@ -0,0 +1,68 @@
+import {
+  REBLOG_SUCCESS,
+  UNREBLOG_SUCCESS,
+  FAVOURITE_SUCCESS,
+  UNFAVOURITE_SUCCESS
+} from '../actions/interactions';
+import {
+  STATUS_FETCH_SUCCESS,
+  CONTEXT_FETCH_SUCCESS
+} from '../actions/statuses';
+import {
+  TIMELINE_REFRESH_SUCCESS,
+  TIMELINE_UPDATE,
+  TIMELINE_DELETE,
+  TIMELINE_EXPAND_SUCCESS
+} from '../actions/timelines';
+import {
+  ACCOUNT_TIMELINE_FETCH_SUCCESS,
+  ACCOUNT_TIMELINE_EXPAND_SUCCESS
+} from '../actions/accounts';
+import Immutable from 'immutable';
+
+const normalizeStatus = (state, status) => {
+  status = status.set('account', status.getIn(['account', 'id']));
+
+  if (status.getIn(['reblog', 'id'])) {
+    state  = normalizeStatus(state, status.get('reblog'));
+    status = status.set('reblog', status.getIn(['reblog', 'id']));
+  }
+
+  return state.set(status.get('id'), status);
+};
+
+const normalizeStatuses = (state, statuses) => {
+  statuses.forEach(status => {
+    state = normalizeStatus(state, status);
+  });
+
+  return state;
+};
+
+const deleteStatus = (state, id, references) => {
+  references.forEach(ref => {
+    state = deleteStatus(state, ref[0], []);
+  });
+
+  return state.delete(id);
+};
+
+const initialState = Immutable.Map();
+
+export default function statuses(state = initialState, action) {
+  switch(action.type) {
+    case TIMELINE_UPDATE:
+    case STATUS_FETCH_SUCCESS:
+      return normalizeStatus(state, Immutable.fromJS(action.status));
+    case TIMELINE_REFRESH_SUCCESS:
+    case TIMELINE_EXPAND_SUCCESS:
+    case ACCOUNT_TIMELINE_FETCH_SUCCESS:
+    case ACCOUNT_TIMELINE_EXPAND_SUCCESS:
+    case CONTEXT_FETCH_SUCCESS:
+      return normalizeStatuses(state, Immutable.fromJS(action.statuses));
+    case TIMELINE_DELETE:
+      return deleteStatus(state, action.id, action.references);
+    default:
+      return state;
+  }
+};