49 lines
1.2 KiB
TypeScript
49 lines
1.2 KiB
TypeScript
/**
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* @prettier
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*/
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import is from '@sindresorhus/is';
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import { Message } from './Message';
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interface ConversationLastMessageUpdate {
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lastMessage: string | null;
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timestamp: number | null;
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}
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export const createLastMessageUpdate = ({
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currentLastMessageText,
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currentTimestamp,
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lastMessage,
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lastMessageNotificationText,
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}: {
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currentLastMessageText: string | null;
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currentTimestamp: number | null;
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lastMessage: Message | null;
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lastMessageNotificationText: string | null;
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}): ConversationLastMessageUpdate => {
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if (lastMessage === null) {
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return {
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lastMessage: '',
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timestamp: null,
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};
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}
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const { type } = lastMessage;
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const isVerifiedChangeMessage = type === 'verified-change';
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const isExpiringMessage = is.object(lastMessage.expirationTimerUpdate);
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const shouldUpdateTimestamp = !isVerifiedChangeMessage && !isExpiringMessage;
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const newTimestamp = shouldUpdateTimestamp
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? lastMessage.sent_at
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: currentTimestamp;
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const shouldUpdateLastMessageText = !isVerifiedChangeMessage;
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const newLastMessageText = shouldUpdateLastMessageText
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? lastMessageNotificationText
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: currentLastMessageText;
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return {
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lastMessage: newLastMessageText,
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timestamp: newTimestamp,
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};
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};
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