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https://github.com/funamitech/mastodon
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523 lines
16 KiB
TypeScript
523 lines
16 KiB
TypeScript
import { createReducer, isAnyOf } from '@reduxjs/toolkit';
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import {
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authorizeFollowRequestSuccess,
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blockAccountSuccess,
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muteAccountSuccess,
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rejectFollowRequestSuccess,
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} from 'flavours/glitch/actions/accounts_typed';
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import { focusApp, unfocusApp } from 'flavours/glitch/actions/app';
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import { blockDomainSuccess } from 'flavours/glitch/actions/domain_blocks_typed';
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import { fetchMarkers } from 'flavours/glitch/actions/markers';
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import {
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clearNotifications,
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fetchNotifications,
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fetchNotificationsGap,
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processNewNotificationForGroups,
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loadPending,
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updateScrollPosition,
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markNotificationsAsRead,
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mountNotifications,
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unmountNotifications,
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} from 'flavours/glitch/actions/notification_groups';
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import {
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disconnectTimeline,
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timelineDelete,
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} from 'flavours/glitch/actions/timelines_typed';
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import type { ApiNotificationJSON } from 'flavours/glitch/api_types/notifications';
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import { compareId } from 'flavours/glitch/compare_id';
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import { usePendingItems } from 'flavours/glitch/initial_state';
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import {
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NOTIFICATIONS_GROUP_MAX_AVATARS,
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createNotificationGroupFromJSON,
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createNotificationGroupFromNotificationJSON,
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} from 'flavours/glitch/models/notification_group';
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import type { NotificationGroup } from 'flavours/glitch/models/notification_group';
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const NOTIFICATIONS_TRIM_LIMIT = 50;
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export interface NotificationGap {
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type: 'gap';
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maxId?: string;
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sinceId?: string;
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}
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interface NotificationGroupsState {
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groups: (NotificationGroup | NotificationGap)[];
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pendingGroups: (NotificationGroup | NotificationGap)[];
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scrolledToTop: boolean;
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isLoading: boolean;
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lastReadId: string;
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readMarkerId: string;
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mounted: number;
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isTabVisible: boolean;
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}
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const initialState: NotificationGroupsState = {
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groups: [],
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pendingGroups: [], // holds pending groups in slow mode
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scrolledToTop: false,
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isLoading: false,
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// The following properties are used to track unread notifications
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lastReadId: '0', // used internally for unread notifications
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readMarkerId: '0', // user-facing and updated when focus changes
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mounted: 0, // number of mounted notification list components, usually 0 or 1
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isTabVisible: true,
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};
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function filterNotificationsForAccounts(
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groups: NotificationGroupsState['groups'],
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accountIds: string[],
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onlyForType?: string,
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) {
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groups = groups
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.map((group) => {
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if (
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group.type !== 'gap' &&
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(!onlyForType || group.type === onlyForType)
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) {
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const previousLength = group.sampleAccountIds.length;
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group.sampleAccountIds = group.sampleAccountIds.filter(
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(id) => !accountIds.includes(id),
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);
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const newLength = group.sampleAccountIds.length;
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const removed = previousLength - newLength;
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group.notifications_count -= removed;
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}
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return group;
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})
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.filter(
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(group) => group.type === 'gap' || group.sampleAccountIds.length > 0,
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);
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mergeGaps(groups);
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return groups;
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}
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function filterNotificationsForStatus(
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groups: NotificationGroupsState['groups'],
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statusId: string,
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) {
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groups = groups.filter(
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(group) =>
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group.type === 'gap' ||
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!('statusId' in group) ||
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group.statusId !== statusId,
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);
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mergeGaps(groups);
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return groups;
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}
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function removeNotificationsForAccounts(
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state: NotificationGroupsState,
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accountIds: string[],
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onlyForType?: string,
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) {
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state.groups = filterNotificationsForAccounts(
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state.groups,
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accountIds,
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onlyForType,
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);
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state.pendingGroups = filterNotificationsForAccounts(
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state.pendingGroups,
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accountIds,
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onlyForType,
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);
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}
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function removeNotificationsForStatus(
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state: NotificationGroupsState,
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statusId: string,
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) {
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state.groups = filterNotificationsForStatus(state.groups, statusId);
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state.pendingGroups = filterNotificationsForStatus(
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state.pendingGroups,
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statusId,
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);
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}
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function isNotificationGroup(
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groupOrGap: NotificationGroup | NotificationGap,
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): groupOrGap is NotificationGroup {
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return groupOrGap.type !== 'gap';
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}
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// Merge adjacent gaps in `groups` in-place
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function mergeGaps(groups: NotificationGroupsState['groups']) {
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for (let i = 0; i < groups.length; i++) {
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const firstGroupOrGap = groups[i];
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if (firstGroupOrGap?.type === 'gap') {
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let lastGap = firstGroupOrGap;
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let j = i + 1;
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for (; j < groups.length; j++) {
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const groupOrGap = groups[j];
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if (groupOrGap?.type === 'gap') lastGap = groupOrGap;
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else break;
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}
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if (j - i > 1) {
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groups.splice(i, j - i, {
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type: 'gap',
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maxId: firstGroupOrGap.maxId,
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sinceId: lastGap.sinceId,
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});
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}
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}
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}
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}
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// Checks if `groups[index-1]` and `groups[index]` are gaps, and merge them in-place if they are
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function mergeGapsAround(
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groups: NotificationGroupsState['groups'],
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index: number,
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) {
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if (index > 0) {
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const potentialFirstGap = groups[index - 1];
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const potentialSecondGap = groups[index];
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if (
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potentialFirstGap?.type === 'gap' &&
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potentialSecondGap?.type === 'gap'
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) {
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groups.splice(index - 1, 2, {
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type: 'gap',
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maxId: potentialFirstGap.maxId,
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sinceId: potentialSecondGap.sinceId,
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});
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}
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}
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}
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function processNewNotification(
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groups: NotificationGroupsState['groups'],
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notification: ApiNotificationJSON,
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) {
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const existingGroupIndex = groups.findIndex(
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(group) =>
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group.type !== 'gap' && group.group_key === notification.group_key,
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);
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// In any case, we are going to add a group at the top
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// If there is currently a gap at the top, now is the time to update it
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if (groups.length > 0 && groups[0]?.type === 'gap') {
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groups[0].maxId = notification.id;
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}
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if (existingGroupIndex > -1) {
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const existingGroup = groups[existingGroupIndex];
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if (
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existingGroup &&
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existingGroup.type !== 'gap' &&
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!existingGroup.sampleAccountIds.includes(notification.account.id) // This can happen for example if you like, then unlike, then like again the same post
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) {
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// Update the existing group
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if (
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existingGroup.sampleAccountIds.unshift(notification.account.id) >
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NOTIFICATIONS_GROUP_MAX_AVATARS
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)
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existingGroup.sampleAccountIds.pop();
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existingGroup.most_recent_notification_id = notification.id;
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existingGroup.page_max_id = notification.id;
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existingGroup.latest_page_notification_at = notification.created_at;
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existingGroup.notifications_count += 1;
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groups.splice(existingGroupIndex, 1);
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mergeGapsAround(groups, existingGroupIndex);
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groups.unshift(existingGroup);
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}
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} else {
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// Create a new group
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groups.unshift(createNotificationGroupFromNotificationJSON(notification));
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}
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}
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function trimNotifications(state: NotificationGroupsState) {
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if (state.scrolledToTop) {
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state.groups.splice(NOTIFICATIONS_TRIM_LIMIT);
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}
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}
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function shouldMarkNewNotificationsAsRead(
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{
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isTabVisible,
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scrolledToTop,
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mounted,
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lastReadId,
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groups,
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}: NotificationGroupsState,
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ignoreScroll = false,
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) {
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const isMounted = mounted > 0;
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const oldestGroup = groups.findLast(isNotificationGroup);
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const hasMore = groups.at(-1)?.type === 'gap';
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const oldestGroupReached =
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!hasMore ||
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lastReadId === '0' ||
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(oldestGroup?.page_min_id &&
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compareId(oldestGroup.page_min_id, lastReadId) <= 0);
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return (
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isTabVisible &&
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(ignoreScroll || scrolledToTop) &&
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isMounted &&
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oldestGroupReached
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);
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}
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function updateLastReadId(
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state: NotificationGroupsState,
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group: NotificationGroup | undefined = undefined,
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) {
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if (shouldMarkNewNotificationsAsRead(state)) {
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group = group ?? state.groups.find(isNotificationGroup);
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if (
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group?.page_max_id &&
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compareId(state.lastReadId, group.page_max_id) < 0
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)
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state.lastReadId = group.page_max_id;
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}
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}
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function commitLastReadId(state: NotificationGroupsState) {
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if (shouldMarkNewNotificationsAsRead(state)) {
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state.readMarkerId = state.lastReadId;
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}
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}
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export const notificationGroupsReducer = createReducer<NotificationGroupsState>(
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initialState,
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(builder) => {
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builder
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.addCase(fetchNotifications.fulfilled, (state, action) => {
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state.groups = action.payload.map((json) =>
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json.type === 'gap' ? json : createNotificationGroupFromJSON(json),
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);
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state.isLoading = false;
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updateLastReadId(state);
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})
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.addCase(fetchNotificationsGap.fulfilled, (state, action) => {
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const { notifications } = action.payload;
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// find the gap in the existing notifications
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const gapIndex = state.groups.findIndex(
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(groupOrGap) =>
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groupOrGap.type === 'gap' &&
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groupOrGap.sinceId === action.meta.arg.gap.sinceId &&
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groupOrGap.maxId === action.meta.arg.gap.maxId,
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);
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if (gapIndex < 0)
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// We do not know where to insert, let's return
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return;
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// Filling a disconnection gap means we're getting historical data
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// about groups we may know or may not know about.
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// The notifications timeline is split in two by the gap, with
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// group information newer than the gap, and group information older
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// than the gap.
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// Filling a gap should not touch anything before the gap, so any
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// information on groups already appearing before the gap should be
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// discarded, while any information on groups appearing after the gap
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// can be updated and re-ordered.
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const oldestPageNotification = notifications.at(-1)?.page_min_id;
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// replace the gap with the notifications + a new gap
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const newerGroupKeys = state.groups
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.slice(0, gapIndex)
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.filter(isNotificationGroup)
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.map((group) => group.group_key);
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const toInsert: NotificationGroupsState['groups'] = notifications
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.map((json) => createNotificationGroupFromJSON(json))
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.filter(
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(notification) => !newerGroupKeys.includes(notification.group_key),
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);
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const apiGroupKeys = (toInsert as NotificationGroup[]).map(
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(group) => group.group_key,
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);
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const sinceId = action.meta.arg.gap.sinceId;
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if (
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notifications.length > 0 &&
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!(
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oldestPageNotification &&
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sinceId &&
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compareId(oldestPageNotification, sinceId) <= 0
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)
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) {
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// If we get an empty page, it means we reached the bottom, so we do not need to insert a new gap
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// Similarly, if we've fetched more than the gap's, this means we have completely filled it
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toInsert.push({
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type: 'gap',
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maxId: notifications.at(-1)?.page_max_id,
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sinceId,
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} as NotificationGap);
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}
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// Remove older groups covered by the API
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state.groups = state.groups.filter(
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(groupOrGap) =>
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groupOrGap.type !== 'gap' &&
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!apiGroupKeys.includes(groupOrGap.group_key),
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);
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// Replace the gap with API results (+ the new gap if needed)
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state.groups.splice(gapIndex, 1, ...toInsert);
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// Finally, merge any adjacent gaps that could have been created by filtering
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// groups earlier
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mergeGaps(state.groups);
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state.isLoading = false;
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updateLastReadId(state);
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})
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.addCase(processNewNotificationForGroups.fulfilled, (state, action) => {
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const notification = action.payload;
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processNewNotification(
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usePendingItems ? state.pendingGroups : state.groups,
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notification,
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);
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updateLastReadId(state);
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trimNotifications(state);
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})
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.addCase(disconnectTimeline, (state, action) => {
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if (action.payload.timeline === 'home') {
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if (state.groups.length > 0 && state.groups[0]?.type !== 'gap') {
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state.groups.unshift({
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type: 'gap',
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sinceId: state.groups[0]?.page_min_id,
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});
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}
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}
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})
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.addCase(timelineDelete, (state, action) => {
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removeNotificationsForStatus(state, action.payload.statusId);
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})
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.addCase(clearNotifications.pending, (state) => {
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state.groups = [];
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state.pendingGroups = [];
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})
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.addCase(blockAccountSuccess, (state, action) => {
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removeNotificationsForAccounts(state, [action.payload.relationship.id]);
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})
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.addCase(muteAccountSuccess, (state, action) => {
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if (action.payload.relationship.muting_notifications)
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removeNotificationsForAccounts(state, [
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action.payload.relationship.id,
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]);
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})
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.addCase(blockDomainSuccess, (state, action) => {
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removeNotificationsForAccounts(
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state,
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action.payload.accounts.map((account) => account.id),
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);
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})
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.addCase(loadPending, (state) => {
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// First, remove any existing group and merge data
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state.pendingGroups.forEach((group) => {
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if (group.type !== 'gap') {
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const existingGroupIndex = state.groups.findIndex(
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(groupOrGap) =>
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isNotificationGroup(groupOrGap) &&
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groupOrGap.group_key === group.group_key,
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);
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if (existingGroupIndex > -1) {
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const existingGroup = state.groups[existingGroupIndex];
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if (existingGroup && existingGroup.type !== 'gap') {
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group.notifications_count += existingGroup.notifications_count;
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group.sampleAccountIds = group.sampleAccountIds
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.concat(existingGroup.sampleAccountIds)
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.slice(0, NOTIFICATIONS_GROUP_MAX_AVATARS);
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state.groups.splice(existingGroupIndex, 1);
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}
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}
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}
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trimNotifications(state);
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});
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// Then build the consolidated list and clear pending groups
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state.groups = state.pendingGroups.concat(state.groups);
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state.pendingGroups = [];
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})
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.addCase(updateScrollPosition, (state, action) => {
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state.scrolledToTop = action.payload.top;
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updateLastReadId(state);
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trimNotifications(state);
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})
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.addCase(markNotificationsAsRead, (state) => {
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const mostRecentGroup = state.groups.find(isNotificationGroup);
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if (
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mostRecentGroup?.page_max_id &&
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compareId(state.lastReadId, mostRecentGroup.page_max_id) < 0
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)
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state.lastReadId = mostRecentGroup.page_max_id;
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commitLastReadId(state);
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})
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.addCase(fetchMarkers.fulfilled, (state, action) => {
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if (
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action.payload.markers.notifications &&
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compareId(
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state.lastReadId,
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action.payload.markers.notifications.last_read_id,
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) < 0
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) {
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state.lastReadId = action.payload.markers.notifications.last_read_id;
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state.readMarkerId =
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action.payload.markers.notifications.last_read_id;
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}
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})
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.addCase(mountNotifications, (state) => {
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state.mounted += 1;
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commitLastReadId(state);
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updateLastReadId(state);
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})
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.addCase(unmountNotifications, (state) => {
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state.mounted -= 1;
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})
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.addCase(focusApp, (state) => {
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state.isTabVisible = true;
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commitLastReadId(state);
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updateLastReadId(state);
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})
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.addCase(unfocusApp, (state) => {
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state.isTabVisible = false;
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})
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.addMatcher(
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isAnyOf(authorizeFollowRequestSuccess, rejectFollowRequestSuccess),
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(state, action) => {
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removeNotificationsForAccounts(
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state,
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[action.payload.id],
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'follow_request',
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);
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},
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)
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.addMatcher(
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isAnyOf(fetchNotifications.pending, fetchNotificationsGap.pending),
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(state) => {
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state.isLoading = true;
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},
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)
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.addMatcher(
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isAnyOf(fetchNotifications.rejected, fetchNotificationsGap.rejected),
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(state) => {
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state.isLoading = false;
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},
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);
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},
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);
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