import EventEmitter from 'events';
import { WAMessageStatus } from '../Types/index.js';
import { trimUndefined } from './generics.js';
import { updateMessageWithReaction, updateMessageWithReceipt } from './messages.js';
import { isRealMessage, shouldIncrementChatUnread } from './process-message.js';
const BUFFERABLE_EVENT = [
    'messaging-history.set',
    'chats.upsert',
    'chats.update',
    'chats.delete',
    'contacts.upsert',
    'contacts.update',
    'messages.upsert',
    'messages.update',
    'messages.delete',
    'messages.reaction',
    'message-receipt.update',
    'groups.update'
];
const BUFFERABLE_EVENT_SET = new Set(BUFFERABLE_EVENT);
/**
 * The event buffer logically consolidates different events into a single event
 * making the data processing more efficient.
 */
export const makeEventBuffer = (logger) => {
    const ev = new EventEmitter();
    const historyCache = new Set();
    let data = makeBufferData();
    let isBuffering = false;
    let bufferTimeout = null;
    let flushPendingTimeout = null; // Add a specific timer for the debounced flush to prevent leak
    let bufferCount = 0;
    const MAX_HISTORY_CACHE_SIZE = 10000; // Limit the history cache size to prevent memory bloat
    const BUFFER_TIMEOUT_MS = 30000; // 30 seconds
    // take the generic event and fire it as a baileys event
    ev.on('event', (map) => {
        for (const event in map) {
            ev.emit(event, map[event]);
        }
    });
    function buffer() {
        if (!isBuffering) {
            logger.debug('Event buffer activated');
            isBuffering = true;
            bufferCount = 0;
            if (bufferTimeout) {
                clearTimeout(bufferTimeout);
            }
            bufferTimeout = setTimeout(() => {
                if (isBuffering) {
                    logger.warn('Buffer timeout reached, auto-flushing');
                    flush();
                }
            }, BUFFER_TIMEOUT_MS);
        }
        // Always increment count when requested
        bufferCount++;
    }
    function flush() {
        if (!isBuffering) {
            return false;
        }
        logger.debug({ bufferCount }, 'Flushing event buffer');
        isBuffering = false;
        bufferCount = 0;
        // Clear timeout
        if (bufferTimeout) {
            clearTimeout(bufferTimeout);
            bufferTimeout = null;
        }
        if (flushPendingTimeout) {
            clearTimeout(flushPendingTimeout);
            flushPendingTimeout = null;
        }
        // Clear history cache if it exceeds the max size
        if (historyCache.size > MAX_HISTORY_CACHE_SIZE) {
            logger.debug({ cacheSize: historyCache.size }, 'Clearing history cache');
            historyCache.clear();
        }
        const newData = makeBufferData();
        const chatUpdates = Object.values(data.chatUpdates);
        let conditionalChatUpdatesLeft = 0;
        for (const update of chatUpdates) {
            if (update.conditional) {
                conditionalChatUpdatesLeft += 1;
                newData.chatUpdates[update.id] = update;
                delete data.chatUpdates[update.id];
            }
        }
        const consolidatedData = consolidateEvents(data);
        if (Object.keys(consolidatedData).length) {
            ev.emit('event', consolidatedData);
        }
        data = newData;
        logger.trace({ conditionalChatUpdatesLeft }, 'released buffered events');
        return true;
    }
    return {
        process(handler) {
            const listener = async (map) => {
                await handler(map);
            };
            ev.on('event', listener);
            return () => {
                ev.off('event', listener);
            };
        },
        emit(event, evData) {
            // Check if this is a messages.upsert with a different type than what's buffered
            // If so, flush the buffered messages first to avoid type overshadowing
            if (event === 'messages.upsert') {
                const { type } = evData;
                const existingUpserts = Object.values(data.messageUpserts);
                if (existingUpserts.length > 0) {
                    const bufferedType = existingUpserts[0].type;
                    if (bufferedType !== type) {
                        logger.debug({ bufferedType, newType: type }, 'messages.upsert type mismatch, emitting buffered messages');
                        // Emit the buffered messages with their correct type
                        ev.emit('event', {
                            'messages.upsert': {
                                messages: existingUpserts.map(m => m.message),
                                type: bufferedType
                            }
                        });
                        // Clear the message upserts from the buffer
                        data.messageUpserts = {};
                    }
                }
            }
            if (isBuffering && BUFFERABLE_EVENT_SET.has(event)) {
                append(data, historyCache, event, evData, logger);
                return true;
            }
            return ev.emit('event', { [event]: evData });
        },
        isBuffering() {
            return isBuffering;
        },
        buffer,
        flush,
        createBufferedFunction(work) {
            return async (...args) => {
                buffer();
                try {
                    const result = await work(...args);
                    // If this is the only buffer, flush after a small delay
                    if (bufferCount === 1) {
                        setTimeout(() => {
                            if (isBuffering && bufferCount === 1) {
                                flush();
                            }
                        }, 100); // Small delay to allow nested buffers
                    }
                    return result;
                }
                catch (error) {
                    throw error;
                }
                finally {
                    bufferCount = Math.max(0, bufferCount - 1);
                    if (bufferCount === 0) {
                        // Only schedule ONE timeout, not 10,000
                        if (!flushPendingTimeout) {
                            flushPendingTimeout = setTimeout(flush, 100);
                        }
                    }
                }
            };
        },
        on: (...args) => ev.on(...args),
        off: (...args) => ev.off(...args),
        removeAllListeners: (...args) => ev.removeAllListeners(...args),
        destroy() {
            // Clear buffer timeout
            if (bufferTimeout) {
                clearTimeout(bufferTimeout);
                bufferTimeout = null;
            }
            if (flushPendingTimeout) {
                clearTimeout(flushPendingTimeout);
                flushPendingTimeout = null;
            }
            // Clear history cache
            historyCache.clear();
            // Reset buffer data
            data = makeBufferData();
            isBuffering = false;
            bufferCount = 0;
            // Remove all listeners
            ev.removeAllListeners();
            logger.debug('Event buffer destroyed');
        }
    };
};
const makeBufferData = () => {
    return {
        historySets: {
            chats: {},
            messages: {},
            contacts: {},
            isLatest: false,
            empty: true
        },
        chatUpserts: {},
        chatUpdates: {},
        chatDeletes: new Set(),
        contactUpserts: {},
        contactUpdates: {},
        messageUpserts: {},
        messageUpdates: {},
        messageReactions: {},
        messageDeletes: {},
        messageReceipts: {},
        groupUpdates: {}
    };
};
function append(data, historyCache, event, 
// eslint-disable-next-line @typescript-eslint/no-explicit-any
eventData, logger) {
    switch (event) {
        case 'messaging-history.set':
            for (const chat of eventData.chats) {
                const id = chat.id || '';
                const existingChat = data.historySets.chats[id];
                if (existingChat) {
                    existingChat.endOfHistoryTransferType = chat.endOfHistoryTransferType;
                }
                if (!existingChat && !historyCache.has(id)) {
                    data.historySets.chats[id] = chat;
                    historyCache.add(id);
                    absorbingChatUpdate(chat);
                }
            }
            for (const contact of eventData.contacts) {
                const existingContact = data.historySets.contacts[contact.id];
                if (existingContact) {
                    Object.assign(existingContact, trimUndefined(contact));
                }
                else {
                    const historyContactId = `c:${contact.id}`;
                    const hasAnyName = contact.notify || contact.name || contact.verifiedName;
                    if (!historyCache.has(historyContactId) || hasAnyName) {
                        data.historySets.contacts[contact.id] = contact;
                        historyCache.add(historyContactId);
                    }
                }
            }
            for (const message of eventData.messages) {
                const key = stringifyMessageKey(message.key);
                const existingMsg = data.historySets.messages[key];
                if (!existingMsg && !historyCache.has(key)) {
                    data.historySets.messages[key] = message;
                    historyCache.add(key);
                }
            }
            data.historySets.empty = false;
            data.historySets.syncType = eventData.syncType;
            if (eventData.pastParticipants?.length) {
                const merged = new Map();
                const sigOf = (p) => `${p.userJid || ''}:${p.leaveTs || ''}:${p.leaveReason || ''}`;
                const ingest = (entry) => {
                    const key = entry.groupJid ?? JSON.stringify(entry);
                    const existing = merged.get(key);
                    if (!existing) {
                        merged.set(key, { ...entry, pastParticipants: [...(entry.pastParticipants || [])] });
                        return;
                    }
                    const seen = new Set((existing.pastParticipants || []).map(sigOf));
                    for (const p of entry.pastParticipants || []) {
                        const sig = sigOf(p);
                        if (!seen.has(sig)) {
                            existing.pastParticipants.push(p);
                            seen.add(sig);
                        }
                    }
                };
                for (const entry of data.historySets.pastParticipants || [])
                    ingest(entry);
                for (const entry of eventData.pastParticipants)
                    ingest(entry);
                data.historySets.pastParticipants = [...merged.values()];
            }
            data.historySets.progress = eventData.progress;
            data.historySets.chunkOrder = eventData.chunkOrder;
            data.historySets.peerDataRequestSessionId = eventData.peerDataRequestSessionId;
            data.historySets.isLatest = eventData.isLatest || data.historySets.isLatest;
            break;
        case 'chats.upsert':
            for (const chat of eventData) {
                const id = chat.id || '';
                let upsert = data.chatUpserts[id];
                if (id && !upsert) {
                    upsert = data.historySets.chats[id];
                    if (upsert) {
                        logger.debug({ chatId: id }, 'absorbed chat upsert in chat set');
                    }
                }
                if (upsert) {
                    upsert = concatChats(upsert, chat);
                }
                else {
                    upsert = chat;
                    data.chatUpserts[id] = upsert;
                }
                absorbingChatUpdate(upsert);
                if (data.chatDeletes.has(id)) {
                    data.chatDeletes.delete(id);
                }
            }
            break;
        case 'chats.update':
            for (const update of eventData) {
                const chatId = update.id;
                const conditionMatches = update.conditional ? update.conditional(data) : true;
                if (conditionMatches) {
                    delete update.conditional;
                    // if there is an existing upsert, merge the update into it
                    const upsert = data.historySets.chats[chatId] || data.chatUpserts[chatId];
                    if (upsert) {
                        concatChats(upsert, update);
                    }
                    else {
                        // merge the update into the existing update
                        const chatUpdate = data.chatUpdates[chatId] || {};
                        data.chatUpdates[chatId] = concatChats(chatUpdate, update);
                    }
                }
                else if (conditionMatches === undefined) {
                    // condition yet to be fulfilled
                    data.chatUpdates[chatId] = update;
                }
                // otherwise -- condition not met, update is invalid
                // if the chat has been updated
                // ignore any existing chat delete
                if (data.chatDeletes.has(chatId)) {
                    data.chatDeletes.delete(chatId);
                }
            }
            break;
        case 'chats.delete':
            for (const chatId of eventData) {
                if (!data.chatDeletes.has(chatId)) {
                    data.chatDeletes.add(chatId);
                }
                // remove any prior updates & upserts
                if (data.chatUpdates[chatId]) {
                    delete data.chatUpdates[chatId];
                }
                if (data.chatUpserts[chatId]) {
                    delete data.chatUpserts[chatId];
                }
                if (data.historySets.chats[chatId]) {
                    delete data.historySets.chats[chatId];
                }
            }
            break;
        case 'contacts.upsert':
            for (const contact of eventData) {
                let upsert = data.contactUpserts[contact.id];
                if (!upsert) {
                    upsert = data.historySets.contacts[contact.id];
                    if (upsert) {
                        logger.debug({ contactId: contact.id }, 'absorbed contact upsert in contact set');
                    }
                }
                if (upsert) {
                    upsert = Object.assign(upsert, trimUndefined(contact));
                }
                else {
                    upsert = contact;
                    data.contactUpserts[contact.id] = upsert;
                }
                if (data.contactUpdates[contact.id]) {
                    upsert = Object.assign(data.contactUpdates[contact.id], trimUndefined(contact));
                    delete data.contactUpdates[contact.id];
                }
            }
            break;
        case 'contacts.update':
            const contactUpdates = eventData;
            for (const update of contactUpdates) {
                const id = update.id;
                // merge into prior upsert
                const upsert = data.historySets.contacts[id] || data.contactUpserts[id];
                if (upsert) {
                    Object.assign(upsert, update);
                }
                else {
                    // merge into prior update
                    const contactUpdate = data.contactUpdates[id] || {};
                    data.contactUpdates[id] = Object.assign(contactUpdate, update);
                }
            }
            break;
        case 'messages.upsert':
            const { messages, type } = eventData;
            for (const message of messages) {
                const key = stringifyMessageKey(message.key);
                let existing = data.messageUpserts[key]?.message;
                if (!existing) {
                    existing = data.historySets.messages[key];
                    if (existing) {
                        logger.debug({ messageId: key }, 'absorbed message upsert in message set');
                    }
                }
                if (existing) {
                    message.messageTimestamp = existing.messageTimestamp;
                }
                if (data.messageUpdates[key]) {
                    logger.debug('absorbed prior message update in message upsert');
                    Object.assign(message, data.messageUpdates[key].update);
                    delete data.messageUpdates[key];
                }
                if (data.historySets.messages[key]) {
                    data.historySets.messages[key] = message;
                }
                else {
                    data.messageUpserts[key] = {
                        message,
                        type: type === 'notify' || data.messageUpserts[key]?.type === 'notify' ? 'notify' : type
                    };
                }
            }
            break;
        case 'messages.update':
            const msgUpdates = eventData;
            for (const { key, update } of msgUpdates) {
                const keyStr = stringifyMessageKey(key);
                const existing = data.historySets.messages[keyStr] || data.messageUpserts[keyStr]?.message;
                if (existing) {
                    Object.assign(existing, update);
                    // if the message was received & read by us
                    // the chat counter must have been incremented
                    // so we need to decrement it
                    if (update.status === WAMessageStatus.READ && !key.fromMe) {
                        decrementChatReadCounterIfMsgDidUnread(existing);
                    }
                }
                else {
                    const msgUpdate = data.messageUpdates[keyStr] || { key, update: {} };
                    Object.assign(msgUpdate.update, update);
                    data.messageUpdates[keyStr] = msgUpdate;
                }
            }
            break;
        case 'messages.delete':
            const deleteData = eventData;
            if ('keys' in deleteData) {
                const { keys } = deleteData;
                for (const key of keys) {
                    const keyStr = stringifyMessageKey(key);
                    if (!data.messageDeletes[keyStr]) {
                        data.messageDeletes[keyStr] = key;
                    }
                    if (data.messageUpserts[keyStr]) {
                        delete data.messageUpserts[keyStr];
                    }
                    if (data.messageUpdates[keyStr]) {
                        delete data.messageUpdates[keyStr];
                    }
                }
            }
            else {
                // TODO: add support
            }
            break;
        case 'messages.reaction':
            const reactions = eventData;
            for (const { key, reaction } of reactions) {
                const keyStr = stringifyMessageKey(key);
                const existing = data.messageUpserts[keyStr];
                if (existing) {
                    updateMessageWithReaction(existing.message, reaction);
                }
                else {
                    data.messageReactions[keyStr] = data.messageReactions[keyStr] || { key, reactions: [] };
                    updateMessageWithReaction(data.messageReactions[keyStr], reaction);
                }
            }
            break;
        case 'message-receipt.update':
            const receipts = eventData;
            for (const { key, receipt } of receipts) {
                const keyStr = stringifyMessageKey(key);
                const existing = data.messageUpserts[keyStr];
                if (existing) {
                    updateMessageWithReceipt(existing.message, receipt);
                }
                else {
                    data.messageReceipts[keyStr] = data.messageReceipts[keyStr] || { key, userReceipt: [] };
                    updateMessageWithReceipt(data.messageReceipts[keyStr], receipt);
                }
            }
            break;
        case 'groups.update':
            const groupUpdates = eventData;
            for (const update of groupUpdates) {
                const id = update.id;
                const groupUpdate = data.groupUpdates[id] || {};
                if (!data.groupUpdates[id]) {
                    data.groupUpdates[id] = Object.assign(groupUpdate, update);
                }
            }
            break;
        default:
            throw new Error(`"${event}" cannot be buffered`);
    }
    function absorbingChatUpdate(existing) {
        const chatId = existing.id || '';
        const update = data.chatUpdates[chatId];
        if (update) {
            const conditionMatches = update.conditional ? update.conditional(data) : true;
            if (conditionMatches) {
                delete update.conditional;
                logger.debug({ chatId }, 'absorbed chat update in existing chat');
                Object.assign(existing, concatChats(update, existing));
                delete data.chatUpdates[chatId];
            }
            else if (conditionMatches === false) {
                logger.debug({ chatId }, 'chat update condition fail, removing');
                delete data.chatUpdates[chatId];
            }
        }
    }
    function decrementChatReadCounterIfMsgDidUnread(message) {
        // decrement chat unread counter
        // if the message has already been marked read by us
        const chatId = message.key.remoteJid;
        const chat = data.chatUpdates[chatId] || data.chatUpserts[chatId];
        if (isRealMessage(message) &&
            shouldIncrementChatUnread(message) &&
            typeof chat?.unreadCount === 'number' &&
            chat.unreadCount > 0) {
            logger.debug({ chatId: chat.id }, 'decrementing chat counter');
            chat.unreadCount -= 1;
            if (chat.unreadCount === 0) {
                delete chat.unreadCount;
            }
        }
    }
}
function consolidateEvents(data) {
    const map = {};
    if (!data.historySets.empty) {
        map['messaging-history.set'] = {
            chats: Object.values(data.historySets.chats),
            messages: Object.values(data.historySets.messages),
            contacts: Object.values(data.historySets.contacts),
            pastParticipants: data.historySets.pastParticipants,
            syncType: data.historySets.syncType,
            progress: data.historySets.progress,
            isLatest: data.historySets.isLatest,
            chunkOrder: data.historySets.chunkOrder,
            peerDataRequestSessionId: data.historySets.peerDataRequestSessionId
        };
    }
    const chatUpsertList = Object.values(data.chatUpserts);
    if (chatUpsertList.length) {
        map['chats.upsert'] = chatUpsertList;
    }
    const chatUpdateList = Object.values(data.chatUpdates);
    if (chatUpdateList.length) {
        map['chats.update'] = chatUpdateList;
    }
    const chatDeleteList = Array.from(data.chatDeletes);
    if (chatDeleteList.length) {
        map['chats.delete'] = chatDeleteList;
    }
    const messageUpsertList = Object.values(data.messageUpserts);
    if (messageUpsertList.length) {
        const type = messageUpsertList[0].type;
        map['messages.upsert'] = {
            messages: messageUpsertList.map(m => m.message),
            type
        };
    }
    const messageUpdateList = Object.values(data.messageUpdates);
    if (messageUpdateList.length) {
        map['messages.update'] = messageUpdateList;
    }
    const messageDeleteList = Object.values(data.messageDeletes);
    if (messageDeleteList.length) {
        map['messages.delete'] = { keys: messageDeleteList };
    }
    const messageReactionList = Object.values(data.messageReactions).flatMap(({ key, reactions }) => reactions.flatMap(reaction => ({ key, reaction })));
    if (messageReactionList.length) {
        map['messages.reaction'] = messageReactionList;
    }
    const messageReceiptList = Object.values(data.messageReceipts).flatMap(({ key, userReceipt }) => userReceipt.flatMap(receipt => ({ key, receipt })));
    if (messageReceiptList.length) {
        map['message-receipt.update'] = messageReceiptList;
    }
    const contactUpsertList = Object.values(data.contactUpserts);
    if (contactUpsertList.length) {
        map['contacts.upsert'] = contactUpsertList;
    }
    const contactUpdateList = Object.values(data.contactUpdates);
    if (contactUpdateList.length) {
        map['contacts.update'] = contactUpdateList;
    }
    const groupUpdateList = Object.values(data.groupUpdates);
    if (groupUpdateList.length) {
        map['groups.update'] = groupUpdateList;
    }
    return map;
}
function concatChats(a, b) {
    if (b.unreadCount === null && // neutralize unread counter
        a.unreadCount < 0) {
        a.unreadCount = undefined;
        b.unreadCount = undefined;
    }
    if (typeof a.unreadCount === 'number' && typeof b.unreadCount === 'number') {
        b = { ...b };
        if (b.unreadCount >= 0) {
            b.unreadCount = Math.max(b.unreadCount, 0) + Math.max(a.unreadCount, 0);
        }
    }
    return Object.assign(a, b);
}
const stringifyMessageKey = (key) => `${key.remoteJid},${key.id},${key.fromMe ? '1' : '0'}`;
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