nav-reducer.js
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nav-reducer.js
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	// @flow

	import { locallyUniqueToRealizedThreadIDsSelector } from 'lib/selectors/thread-selectors';
	import type { RawThreadInfo } from 'lib/types/thread-types';

	import type { Action } from '../redux/redux-setup';
	import { type NavInfo, updateNavInfoActionType } from '../types/nav-types';

	export default function reduceNavInfo(
	oldState: NavInfo,
	action: Action,
	newThreadInfos: { +[id: string]: RawThreadInfo },
	): NavInfo {
	let state = oldState;
	if (action.type === updateNavInfoActionType) {
	state = {
	...state,
	...action.payload,
	};
	}

	const { activeChatThreadID } = state;
	if (activeChatThreadID) {
	const locallyUniqueToRealizedThreadIDs = locallyUniqueToRealizedThreadIDsSelector(
	newThreadInfos,
	);
	const realizedThreadID = locallyUniqueToRealizedThreadIDs.get(
	activeChatThreadID,
	);
	if (realizedThreadID) {
	state = {
	...state,
	activeChatThreadID: realizedThreadID,
	};
	}
	}

	return state;
	}