import { CONTEXT_FETCH_SUCCESS } from 'themes/glitch/actions/statuses'; import { TIMELINE_DELETE, TIMELINE_CONTEXT_UPDATE } from 'themes/glitch/actions/timelines'; import { Map as ImmutableMap, List as ImmutableList } from 'immutable'; const initialState = ImmutableMap({ ancestors: ImmutableMap(), descendants: ImmutableMap(), }); const normalizeContext = (state, id, ancestors, descendants) => { const ancestorsIds = ImmutableList(ancestors.map(ancestor => ancestor.id)); const descendantsIds = ImmutableList(descendants.map(descendant => descendant.id)); return state.withMutations(map => { map.setIn(['ancestors', id], ancestorsIds); map.setIn(['descendants', id], descendantsIds); }); }; const deleteFromContexts = (state, id) => { state.getIn(['descendants', id], ImmutableList()).forEach(descendantId => { state = state.updateIn(['ancestors', descendantId], ImmutableList(), list => list.filterNot(itemId => itemId === id)); }); state.getIn(['ancestors', id], ImmutableList()).forEach(ancestorId => { state = state.updateIn(['descendants', ancestorId], ImmutableList(), list => list.filterNot(itemId => itemId === id)); }); state = state.deleteIn(['descendants', id]).deleteIn(['ancestors', id]); return state; }; const updateContext = (state, status, references) => { return state.update('descendants', map => { references.forEach(parentId => { map = map.update(parentId, ImmutableList(), list => { if (list.includes(status.id)) { return list; } return list.push(status.id); }); }); return map; }); }; export default function contexts(state = initialState, action) { switch(action.type) { case CONTEXT_FETCH_SUCCESS: return normalizeContext(state, action.id, action.ancestors, action.descendants); case TIMELINE_DELETE: return deleteFromContexts(state, action.id); case TIMELINE_CONTEXT_UPDATE: return updateContext(state, action.status, action.references); default: return state; } };