83 lines
1.8 KiB
TypeScript
83 lines
1.8 KiB
TypeScript
// Copyright 2023 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import type { ReadonlyDeep } from 'type-fest';
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// State
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// eslint-disable-next-line local-rules/type-alias-readonlydeep
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export type InboxStateType = Readonly<{
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firstEnvelopeTimestamp: number | undefined;
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envelopeTimestamp: number | undefined;
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}>;
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// Actions
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const SET_ENVELOPE_TIMESTAMP = 'INBOX/SET_INBOX_ENVELOPE_TIMESTAMP';
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type SetInboxEnvelopeTimestampActionType = ReadonlyDeep<{
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type: typeof SET_ENVELOPE_TIMESTAMP;
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payload: {
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envelopeTimestamp: number | undefined;
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};
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}>;
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export type InboxActionType = ReadonlyDeep<SetInboxEnvelopeTimestampActionType>;
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// Action Creators
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export const actions = {
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setInboxEnvelopeTimestamp,
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};
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function setInboxEnvelopeTimestamp(
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envelopeTimestamp: number | undefined
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): SetInboxEnvelopeTimestampActionType {
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return {
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type: SET_ENVELOPE_TIMESTAMP,
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payload: { envelopeTimestamp },
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};
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}
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// Reducer
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export function getEmptyState(): InboxStateType {
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return {
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firstEnvelopeTimestamp: undefined,
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envelopeTimestamp: undefined,
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};
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}
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export function reducer(
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state: Readonly<InboxStateType> = getEmptyState(),
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action: Readonly<InboxActionType>
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): InboxStateType {
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if (!state) {
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return getEmptyState();
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}
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if (action.type === SET_ENVELOPE_TIMESTAMP) {
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const { payload } = action;
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const { envelopeTimestamp: providedTimestamp } = payload;
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// Ensure monotonicity
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let { envelopeTimestamp } = state;
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if (providedTimestamp !== undefined) {
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envelopeTimestamp = Math.max(
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providedTimestamp,
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envelopeTimestamp ?? providedTimestamp
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);
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}
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const firstEnvelopeTimestamp =
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state.firstEnvelopeTimestamp ?? envelopeTimestamp;
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return {
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...state,
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envelopeTimestamp,
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firstEnvelopeTimestamp,
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};
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}
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return state;
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}
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