RocketChat/Rocket.Chat

import type { IRoom, IRoomWithRetentionPolicy } from '@rocket.chat/core-typings';
import { useSetting } from '@rocket.chat/ui-contexts';

import { TIMEUNIT, isValidTimespan, timeUnitToMs } from '../../../lib/convertTimeUnit';

const hasRetentionPolicy = (room: IRoom & { retention?: any }): room is IRoomWithRetentionPolicy =>
    'retention' in room && room.retention !== undefined;

const isRetentionOverridden = (room: IRoom & { retention?: any }) => 'overrideGlobal' in room.retention && room.retention.overrideGlobal;

type RetentionPolicySettings = {
    enabled: boolean;
    filesOnly: boolean;
    doNotPrunePinned: boolean;
    ignoreThreads: boolean;
    appliesToChannels: boolean;
    maxAgeChannels: number;
    appliesToGroups: boolean;
    maxAgeGroups: number;
    appliesToDMs: boolean;
    maxAgeDMs: number;
};

const isActive = (room: IRoom, { enabled, appliesToChannels, appliesToGroups, appliesToDMs }: RetentionPolicySettings): boolean => {
    if (!enabled) {
        return false;
    }

    if (hasRetentionPolicy(room) && room.retention.enabled !== undefined) {
        return room.retention.enabled;
    }

    switch (room.t) {
        case 'c':
            return appliesToChannels;
        case 'p':
            return appliesToGroups;
        case 'd':
            return appliesToDMs;
    }

    return false;
};

const extractFilesOnly = (room: IRoom, { filesOnly }: RetentionPolicySettings): boolean => {
    if (hasRetentionPolicy(room) && isRetentionOverridden(room)) {
        return room.retention.filesOnly;
    }

    return filesOnly;
};

const extractExcludePinned = (room: IRoom, { doNotPrunePinned }: RetentionPolicySettings): boolean => {
    if (hasRetentionPolicy(room) && isRetentionOverridden(room)) {
        return room.retention.excludePinned;
    }

    return doNotPrunePinned;
};

const extractIgnoreThreads = (room: IRoom, { ignoreThreads }: RetentionPolicySettings): boolean => {
    if (hasRetentionPolicy(room) && isRetentionOverridden(room)) {
        return room.retention.ignoreThreads;
    }

    return ignoreThreads;
};

const getMaxAge = (room: IRoom, { maxAgeChannels, maxAgeGroups, maxAgeDMs }: RetentionPolicySettings): number => {
    if (hasRetentionPolicy(room) && isRetentionOverridden(room) && isValidTimespan(room.retention.maxAge)) {
        return timeUnitToMs(TIMEUNIT.days, room.retention.maxAge);
    }

    if (room.t === 'c') {
        return maxAgeChannels;
    }
    if (room.t === 'p') {
        return maxAgeGroups;
    }
    if (room.t === 'd') {
        return maxAgeDMs;
    }

    return -Infinity;
};

export const useRetentionPolicy = (
    room: IRoom | undefined,
):
    | {
            enabled: boolean;
            isActive: boolean;
            filesOnly: boolean;
            excludePinned: boolean;
            ignoreThreads: boolean;
            maxAge: number;
      }
    | undefined => {
    const settings = {
        enabled: useSetting('RetentionPolicy_Enabled') as boolean,
        filesOnly: useSetting('RetentionPolicy_FilesOnly') as boolean,
        doNotPrunePinned: useSetting('RetentionPolicy_DoNotPrunePinned') as boolean,
        ignoreThreads: useSetting('RetentionPolicy_DoNotPruneThreads') as boolean,
        appliesToChannels: useSetting('RetentionPolicy_AppliesToChannels') as boolean,
        maxAgeChannels: useSetting('RetentionPolicy_TTL_Channels') as number,
        appliesToGroups: useSetting('RetentionPolicy_AppliesToGroups') as boolean,
        maxAgeGroups: useSetting('RetentionPolicy_TTL_Groups') as number,
        appliesToDMs: useSetting('RetentionPolicy_AppliesToDMs') as boolean,
        maxAgeDMs: useSetting('RetentionPolicy_TTL_DMs') as number,
    } as const;

    if (!room) {
        return undefined;
    }

    return {
        enabled: settings.enabled,
        isActive: isActive(room, settings),
        filesOnly: extractFilesOnly(room, settings),
        excludePinned: extractExcludePinned(room, settings),
        ignoreThreads: extractIgnoreThreads(room, settings),
        maxAge: getMaxAge(room, settings),
    };
};