import type { IMessage } from '@rocket.chat/core-typings';

import { t } from '../../../../app/utils/lib/i18n';
import { closeUnclosedCodeBlock } from '../../../../lib/utils/closeUnclosedCodeBlock';
import { Messages, Rooms } from '../../../stores';
import { onClientBeforeSendMessage } from '../../onClientBeforeSendMessage';
import { dispatchToastMessage } from '../../toast';
import type { ChatAPI } from '../ChatAPI';
import { afterSendMessageCallback } from './afterSendMessageCallback';
import { processMessageEditing } from './processMessageEditing';
import { processMessageUploads } from './processMessageUploads';
import { processSetReaction } from './processSetReaction';
import { processSlashCommand } from './processSlashCommand';
import { processTooLongMessage } from './processTooLongMessage';
import { trim } from '../../../../lib/utils/stringUtils';
import { sdk } from '../../SDKClient';
import { onClientMessageReceived } from '../../onClientMessageReceived';
import { settings } from '../../settings';
import { getUserId, getUser } from '../../user';
import { upsertThreadMessageInCache } from '../../utils/threadMessageUtils';

const runOptimisticSendMessage = async (message: Partial<IMessage> & { rid: IMessage['rid']; msg: IMessage['msg'] }): Promise<void> => {
	const uid = getUserId();
	if (!uid || trim(message.msg) === '') {
		return;
	}
	const messageAlreadyExists = message._id && Messages.state.get(message._id);
	if (messageAlreadyExists) {
		dispatchToastMessage({ type: 'error', message: t('Message_Already_Sent') });
		return;
	}
	const user = getUser();
	if (!user?.username) {
		return;
	}

	const room = Rooms.state.get(message.rid);
	if (room?.federated) {
		return;
	}

	const optimistic: IMessage = {
		...(message as IMessage),
		ts: new Date(),
		u: {
			_id: uid,
			username: user.username,
			name: user.name || '',
		},
		temp: true,
		...(settings.peek('Message_Read_Receipt_Enabled') ? { unread: true } : {}),
	};

	const processed = await onClientMessageReceived(optimistic);
	Messages.state.store(processed);

	if (processed.tmid) {
		upsertThreadMessageInCache(processed, processed.rid, processed.tmid);
	}
};

const process = async (chat: ChatAPI, message: IMessage, previewUrls?: string[], isSlashCommandAllowed?: boolean): Promise<void> => {
	const mid = chat.currentEditingMessage.getMID();

	if (await processSetReaction(chat, message)) {
		return;
	}

	if (await processTooLongMessage(chat, message)) {
		return;
	}

	if (isSlashCommandAllowed && (await processSlashCommand(chat, message))) {
		return;
	}

	if (await processMessageUploads(chat, message)) {
		chat.composer?.clear();
		return;
	}

	message = (await onClientBeforeSendMessage({ ...message, isEditing: !!mid })) as IMessage & { isEditing?: boolean };

	// e2e should be a client property only
	delete message.e2e;
	delete (message as IMessage & { isEditing?: boolean }).isEditing;

	if (await processMessageEditing(chat, message, previewUrls)) {
		return;
	}

	chat.composer?.clear();
	await runOptimisticSendMessage(message);

	await sdk.rest.post('/v1/chat.sendMessage', { message, previewUrls });

	// Clear the optimistic `temp` flag only if the messages stream hasn't already
	// replaced the record. Overwriting with the server response can clobber stream
	// updates that arrive first — e.g. read-receipt-driven `unread: false`, async
	// URL/quote attachments, or E2EE decrypt — leading to stale UI state.
	Messages.state.update(
		(record) => record._id === message._id && record.temp === true,
		({ temp: _, ...record }) => record,
	);
};

export const sendMessage = async (
	chat: ChatAPI,
	{
		text,
		tshow,
		previewUrls,
		isSlashCommandAllowed,
	}: { text: string; tshow?: boolean; previewUrls?: string[]; isSlashCommandAllowed?: boolean; tmid?: IMessage['tmid'] },
): Promise<boolean> => {
	if (!(await chat.data.isSubscribedToRoom())) {
		try {
			await chat.data.joinRoom();
		} catch (error) {
			dispatchToastMessage({ type: 'error', message: error });
			return false;
		}
	}

	chat.readStateManager.clearUnreadMark();

	const uploadsStore = chat.composer?.uploads;

	text = text.trim();
	text = closeUnclosedCodeBlock(text);
	const mid = chat.currentEditingMessage.getMID();

	const hasFiles = uploadsStore && uploadsStore.get().length > 0;
	if (!text && !mid && !hasFiles) {
		// Nothing to do
		return false;
	}

	if (text || hasFiles) {
		const message = await chat.data.composeMessage(text, {
			sendToChannel: tshow,
			quotedMessages: chat.composer?.quotedMessages.get() ?? [],
			originalMessage: mid ? await chat.data.findMessageByID(mid) : null,
		});

		// When editing an encrypted message with files, preserve the original attachments/files
		// This ensures they're included in the re-encryption process
		if (mid) {
			const originalMessage = await chat.data.findMessageByID(mid);

			if (originalMessage?.t === 'e2e' && originalMessage.attachments && originalMessage.attachments.length > 0) {
				message.attachments = originalMessage.attachments;
				message.file = originalMessage.file;
			}
		}

		try {
			// Dismiss quoted messages optimistically — they are already baked into
			// `message` by composeMessage above, so the composer preview must unmount
			// regardless of whether the send request resolves. Keeping it coupled to a
			// resolved request leaves the quote stuck in the composer when the REST call
			// rejects even though the message was already broadcast over the stream.
			chat.composer?.dismissAllQuotedMessages();
			await process(chat, message, previewUrls, isSlashCommandAllowed);
			await afterSendMessageCallback(message, message.rid);
		} catch (error) {
			dispatchToastMessage({ type: 'error', message: error });
		}
		return true;
	}

	if (mid) {
		const originalMessage = await chat.data.findMessageByID(mid);

		if (!originalMessage) {
			dispatchToastMessage({ type: 'warning', message: t('Message_not_found') });
			return false;
		}

		try {
			if (await chat.flows.processMessageEditing({ ...originalMessage, msg: '' }, previewUrls)) {
				chat.currentEditingMessage.stop();
				return false;
			}

			await chat.currentEditingMessage.reset();
			await chat.flows.requestMessageDeletion(originalMessage);
			return false;
		} catch (error) {
			dispatchToastMessage({ type: 'error', message: error });
		}
	}

	return false;
};