import { api } from '@rocket.chat/core-services';
import type { UserStatus, IUser } from '@rocket.chat/core-typings';
import { LivechatDepartment, LivechatDepartmentAgents, LivechatRooms, Users } from '@rocket.chat/models';
import { removeEmpty } from '@rocket.chat/tools';

import { updateDepartmentAgents } from './Helper';
import { afterAgentAdded, afterRemoveAgent } from './hooks';
import { settings } from '../../settings';
import { callbacks } from '../callbacks';
import { addUserRolesAsync } from '../roles/addUserRoles';
import { removeUserFromRolesAsync } from '../roles/removeUserFromRoles';

export async function notifyAgentStatusChanged(userId: string, status?: UserStatus) {
	if (!status) {
		return;
	}

	void callbacks.runAsync('livechat.agentStatusChanged', { userId, status });
	if (!settings.get('Livechat_show_agent_info')) {
		return;
	}

	for await (const room of LivechatRooms.findOpenByAgent(userId, { projection: { _id: 1 } })) {
		void api.broadcast('omnichannel.room', room._id, {
			type: 'agentStatus',
			status,
		});
	}
}

export async function addManager(username: string) {
	const user = await Users.findOneByUsername(username, { projection: { _id: 1, username: 1 } });

	if (!user) {
		throw new Error('error-invalid-user');
	}

	if (await addUserRolesAsync(user._id, ['livechat-manager'])) {
		return user;
	}

	return false;
}

export async function addAgent(username: string) {
	// `status` is deliberately not projected: this endpoint has always turned the new agent available
	// regardless of the user's presence, and `afterAgentAdded` relies on the field being absent to do so.
	const user = await Users.findOneByUsername(username, { projection: { _id: 1, username: 1 } });

	if (!user) {
		throw new Error('error-invalid-user');
	}

	if (await addUserRolesAsync(user._id, ['livechat-agent'])) {
		return afterAgentAdded(user);
	}

	return false;
}

export async function removeAgent(id: IUser['_id']) {
	const user = await Users.findOneById<Pick<IUser, '_id' | 'username'>>(id, { projection: { _id: 1, username: 1 } });

	if (!user) {
		throw new Error('error-invalid-user');
	}
	const { _id } = user;

	if (await removeUserFromRolesAsync(_id, ['livechat-agent'])) {
		return afterRemoveAgent(user);
	}

	return false;
}

export async function removeManager(id: IUser['_id']) {
	const user = await Users.findOneById<Pick<IUser, '_id' | 'username'>>(id, { projection: { _id: 1 } });

	if (!user) {
		throw new Error('error-invalid-user');
	}

	return removeUserFromRolesAsync(user._id, ['livechat-manager']);
}

export async function saveAgentInfo(_id: string, agentData: any, agentDepartments: string[]) {
	await Users.setLivechatData(_id, removeEmpty(agentData));

	const currentDepartmentsForAgent = await LivechatDepartmentAgents.findByAgentId(_id).toArray();

	const toRemoveIds = currentDepartmentsForAgent
		.filter((dept) => !agentDepartments.includes(dept.departmentId))
		.map((dept) => dept.departmentId);
	const toAddIds = agentDepartments.filter((d) => !currentDepartmentsForAgent.some((c) => c.departmentId === d));

	await Promise.all(
		await LivechatDepartment.findInIds([...toRemoveIds, ...toAddIds], {
			projection: {
				_id: 1,
				enabled: 1,
			},
		})
			.map((dep) => {
				return updateDepartmentAgents(
					dep._id,
					{
						...(toRemoveIds.includes(dep._id) ? { remove: [{ agentId: _id }] } : { upsert: [{ agentId: _id, count: 0, order: 0 }] }),
					},
					dep.enabled,
				);
			})
			.toArray(),
	);

	return true;
}