import type { INewIncomingIntegration, IIncomingIntegration } from '@rocket.chat/core-typings';
import type { ServerMethods } from '@rocket.chat/ddp-client';
import { Integrations, Subscriptions, Users, Rooms } from '@rocket.chat/models';
import { Random } from '@rocket.chat/random';
import { removeEmpty } from '@rocket.chat/tools';
import { Match, check } from 'meteor/check';
import { Meteor } from 'meteor/meteor';

import { hasPermissionAsync, hasAllPermissionAsync } from '../../../lib/authorization/hasPermission';
import { methodDeprecationLogger } from '../../../lib/deprecationWarningLogger';
import { compileIntegrationScript } from '../../../lib/integrations/lib/compileIntegrationScript';
import { validateScriptEngine, isScriptEngineFrozen } from '../../../lib/integrations/lib/validateScriptEngine';
import { notifyOnIntegrationChanged } from '../../../lib/notifyListener';

const validChannelChars = ['@', '#'];

declare module '@rocket.chat/ddp-client' {
	// eslint-disable-next-line @typescript-eslint/naming-convention
	interface ServerMethods {
		addIncomingIntegration(integration: INewIncomingIntegration): Promise<IIncomingIntegration>;
	}
}

export const addIncomingIntegration = async (userId: string, integration: INewIncomingIntegration): Promise<IIncomingIntegration> => {
	check(
		integration,
		Match.ObjectIncluding({
			type: String,
			name: String,
			enabled: Boolean,
			username: String,
			channel: String,
			alias: Match.Maybe(String),
			emoji: Match.Maybe(String),
			scriptEnabled: Boolean,
			scriptEngine: Match.Maybe(String),
			overrideDestinationChannelEnabled: Match.Maybe(Boolean),
			script: Match.Maybe(String),
			avatar: Match.Maybe(String),
		}),
	);

	if (
		!userId ||
		(!(await hasPermissionAsync(userId, 'manage-incoming-integrations')) &&
			!(await hasPermissionAsync(userId, 'manage-own-incoming-integrations')))
	) {
		throw new Meteor.Error('not_authorized', 'Unauthorized', {
			method: 'addIncomingIntegration',
		});
	}

	if (!integration.channel || typeof integration.channel.valueOf() !== 'string') {
		throw new Meteor.Error('error-invalid-channel', 'Invalid channel', {
			method: 'addIncomingIntegration',
		});
	}

	if (integration.channel.trim() === '') {
		throw new Meteor.Error('error-invalid-channel', 'Invalid channel', {
			method: 'addIncomingIntegration',
		});
	}

	const channels = integration.channel.split(',').map((channel) => channel.trim());

	for (const channel of channels) {
		if (!validChannelChars.includes(channel[0])) {
			throw new Meteor.Error('error-invalid-channel-start-with-chars', 'Invalid channel. Start with @ or #', {
				method: 'updateIncomingIntegration',
			});
		}
	}

	if (!integration.username || typeof integration.username.valueOf() !== 'string' || integration.username.trim() === '') {
		throw new Meteor.Error('error-invalid-username', 'Invalid username', {
			method: 'addIncomingIntegration',
		});
	}

	if (integration.script?.trim()) {
		validateScriptEngine(integration.scriptEngine ?? 'isolated-vm');
	}

	const user = await Users.findOneByUsername(integration.username, { projection: { _id: 1 } });

	if (!user) {
		throw new Meteor.Error('error-invalid-user', 'Invalid user', {
			method: 'addIncomingIntegration',
		});
	}

	if (!(await hasPermissionAsync(user._id, 'message-impersonate'))) {
		throw new Meteor.Error(
			'error-user-lacks-message-impersonate-permission',
			"User selected for the incoming integration lacks the 'message-impersonate' permission.",
			{
				method: 'addIncomingIntegration',
			},
		);
	}

	// Default to transpiling with Babel for backwards compatibility; integrations
	// can opt-out per-record by setting `skipTranspile: true` (removed in 9.0.0).
	const skipTranspile = integration.skipTranspile === true;

	const integrationData: IIncomingIntegration = {
		...integration,
		scriptEngine: integration.scriptEngine ?? 'isolated-vm',
		skipTranspile,
		type: 'webhook-incoming',
		channel: channels,
		overrideDestinationChannelEnabled: integration.overrideDestinationChannelEnabled ?? false,
		token: Random.id(48),
		userId: user._id,
		_createdAt: new Date(),
		_createdBy: await Users.findOne({ _id: userId }, { projection: { username: 1 } }),
	};

	if (
		!isScriptEngineFrozen(integrationData.scriptEngine) &&
		integration.scriptEnabled === true &&
		integration.script &&
		integration.script.trim() !== ''
	) {
		const { script, error } = compileIntegrationScript(integration.script, { transpile: !skipTranspile });
		if (error) {
			integrationData.scriptCompiled = undefined;
			integrationData.scriptError = error;
		} else {
			integrationData.scriptCompiled = script;
			delete integrationData.scriptError;
		}
	}

	for (let channel of channels) {
		let record;
		const channelType = channel[0];
		channel = channel.substr(1);

		switch (channelType) {
			case '#':
				record = await Rooms.findOne({
					$or: [{ _id: channel }, { name: channel }],
				});
				break;
			case '@':
				record = await Users.findOne({
					$or: [{ _id: channel }, { username: channel }],
				});
				break;
		}

		if (!record) {
			throw new Meteor.Error('error-invalid-room', 'Invalid room', {
				method: 'addIncomingIntegration',
			});
		}

		if (
			!(await hasAllPermissionAsync(userId, ['manage-incoming-integrations', 'manage-own-incoming-integrations'])) &&
			!(await Subscriptions.findOneByRoomIdAndUserId(record._id, userId, { projection: { _id: 1 } }))
		) {
			throw new Meteor.Error('error-invalid-channel', 'Invalid Channel', {
				method: 'addIncomingIntegration',
			});
		}
	}

	const strippedIntegrationData = removeEmpty(integrationData);

	const { insertedId } = await Integrations.insertOne(strippedIntegrationData);

	const integrationStored = await Integrations.findOne({ _id: insertedId });

	if (!integrationStored) {
		throw new Error('Error inserting integration');
	}
	void notifyOnIntegrationChanged({ ...integrationStored, _id: insertedId }, 'inserted');

	return integrationStored as IIncomingIntegration;
};

Meteor.methods<ServerMethods>({
	async addIncomingIntegration(integration: INewIncomingIntegration): Promise<IIncomingIntegration> {
		methodDeprecationLogger.method('addIncomingIntegration', '9.0.0', '/v1/integrations.create');
		const { userId } = this;

		if (!userId) {
			throw new Meteor.Error('invalid-user', 'Invalid User', {
				method: 'addIncomingIntegration',
			});
		}

		return addIncomingIntegration(userId, integration);
	},
});