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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;
}
};
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