1 files changed, 150 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/reducers/timelines.js b/app/javascript/flavours/glitch/reducers/timelines.js
new file mode 100644
index 000000000..d7d5ac43f
--- /dev/null
+++ b/app/javascript/flavours/glitch/reducers/timelines.js
@@ -0,0 +1,150 @@
+import {
+  TIMELINE_UPDATE,
+  TIMELINE_DELETE,
+  TIMELINE_CLEAR,
+  TIMELINE_EXPAND_SUCCESS,
+  TIMELINE_EXPAND_REQUEST,
+  TIMELINE_EXPAND_FAIL,
+  TIMELINE_SCROLL_TOP,
+  TIMELINE_DISCONNECT,
+} from 'flavours/glitch/actions/timelines';
+import {
+  ACCOUNT_BLOCK_SUCCESS,
+  ACCOUNT_MUTE_SUCCESS,
+  ACCOUNT_UNFOLLOW_SUCCESS,
+} from 'flavours/glitch/actions/accounts';
+import { Map as ImmutableMap, List as ImmutableList, fromJS } from 'immutable';
+import compareId from 'flavours/glitch/util/compare_id';
+
+const initialState = ImmutableMap();
+
+const initialTimeline = ImmutableMap({
+  unread: 0,
+  top: true,
+  isLoading: false,
+  hasMore: true,
+  items: ImmutableList(),
+});
+
+const expandNormalizedTimeline = (state, timeline, statuses, next, isPartial, isLoadingRecent) => {
+  return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
+    mMap.set('isLoading', false);
+    if (!next && !isLoadingRecent) mMap.set('hasMore', false);
+
+    if (!statuses.isEmpty()) {
+      mMap.update('items', ImmutableList(), oldIds => {
+        const newIds = statuses.map(status => status.get('id'));
+        const lastIndex = oldIds.findLastIndex(id => id !== null && compareId(id, newIds.last()) >= 0) + 1;
+        const firstIndex = oldIds.take(lastIndex).findLastIndex(id => id !== null && compareId(id, newIds.first()) > 0);
+
+        if (firstIndex < 0) {
+          return (isPartial ? newIds.unshift(null) : newIds).concat(oldIds.skip(lastIndex));
+        }
+
+        return oldIds.take(firstIndex + 1).concat(
+          isPartial && oldIds.get(firstIndex) !== null ? newIds.unshift(null) : newIds,
+          oldIds.skip(lastIndex)
+        );
+      });
+    }
+  }));
+};
+
+const updateTimeline = (state, timeline, status) => {
+  const top        = state.getIn([timeline, 'top']);
+  const ids        = state.getIn([timeline, 'items'], ImmutableList());
+  const includesId = ids.includes(status.get('id'));
+  const unread     = state.getIn([timeline, 'unread'], 0);
+
+  if (includesId) {
+    return state;
+  }
+
+  let newIds = ids;
+
+  return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
+    if (!top) mMap.set('unread', unread + 1);
+    if (top && ids.size > 40) newIds = newIds.take(20);
+    mMap.set('items', newIds.unshift(status.get('id')));
+  }));
+};
+
+const deleteStatus = (state, id, accountId, references) => {
+  state.keySeq().forEach(timeline => {
+    state = state.updateIn([timeline, 'items'], list => list.filterNot(item => item === id));
+  });
+
+  // Remove reblogs of deleted status
+  references.forEach(ref => {
+    state = deleteStatus(state, ref[0], ref[1], []);
+  });
+
+  return state;
+};
+
+const clearTimeline = (state, timeline) => {
+  return state.set(timeline, initialTimeline);
+};
+
+const filterTimelines = (state, relationship, statuses) => {
+  let references;
+
+  statuses.forEach(status => {
+    if (status.get('account') !== relationship.id) {
+      return;
+    }
+
+    references = statuses.filter(item => item.get('reblog') === status.get('id')).map(item => [item.get('id'), item.get('account')]);
+    state      = deleteStatus(state, status.get('id'), status.get('account'), references);
+  });
+
+  return state;
+};
+
+const filterTimeline = (timeline, state, relationship, statuses) =>
+  state.updateIn([timeline, 'items'], ImmutableList(), list =>
+    list.filterNot(statusId =>
+      statuses.getIn([statusId, 'account']) === relationship.id
+    ));
+
+const updateTop = (state, timeline, top) => {
+  return state.update(timeline, initialTimeline, map => map.withMutations(mMap => {
+    if (top) mMap.set('unread', 0);
+    mMap.set('top', top);
+  }));
+};
+
+export default function timelines(state = initialState, action) {
+  switch(action.type) {
+  case TIMELINE_EXPAND_REQUEST:
+    return state.update(action.timeline, initialTimeline, map => map.set('isLoading', true));
+  case TIMELINE_EXPAND_FAIL:
+    return state.update(action.timeline, initialTimeline, map => map.set('isLoading', false));
+  case TIMELINE_EXPAND_SUCCESS:
+    return expandNormalizedTimeline(state, action.timeline, fromJS(action.statuses), action.next, action.partial, action.isLoadingRecent);
+  case TIMELINE_UPDATE:
+    return updateTimeline(state, action.timeline, fromJS(action.status));
+  case TIMELINE_DELETE:
+    return deleteStatus(state, action.id, action.accountId, action.references, action.reblogOf);
+  case TIMELINE_CLEAR:
+    return clearTimeline(state, action.timeline);
+  case ACCOUNT_BLOCK_SUCCESS:
+  case ACCOUNT_MUTE_SUCCESS:
+    return filterTimelines(state, action.relationship, action.statuses);
+  case ACCOUNT_UNFOLLOW_SUCCESS:
+    return filterTimeline('home', state, action.relationship, action.statuses);
+  case TIMELINE_SCROLL_TOP:
+    return updateTop(state, action.timeline, action.top);
+  case TIMELINE_DISCONNECT:
+    return state.update(
+      action.timeline,
+      initialTimeline,
+      map => map.update(
+        'items',
+        items => items.first() ? items.unshift(null) : items
+      )
+    );
+  default:
+    return state;
+  }
+};