import type { ILivechatAgent, ILivechatDepartment, SelectedAgent } from '@rocket.chat/core-typings';
import { Users, LivechatDepartmentAgents, LivechatDepartment } from '@rocket.chat/models';
import type { FindCursor } from 'mongodb';

import { checkOnlineForDepartment, getOnlineForDepartment } from './departmentsLib';
import { livechatLogger } from './logger';
import { settings } from '../../settings';

export async function getOnlineAgents(department?: string, agent?: SelectedAgent | null): Promise<FindCursor<ILivechatAgent> | undefined> {
	if (agent?.agentId) {
		return Users.findOnlineAgents(
			agent.agentId,
			settings.get<boolean>('Livechat_enabled_when_agent_idle'),
			settings.get<boolean>('Livechat_accept_chats_with_no_agents'),
		);
	}

	if (department) {
		return getOnlineForDepartment(department);
	}
	return Users.findOnlineAgents(
		undefined,
		settings.get<boolean>('Livechat_enabled_when_agent_idle'),
		settings.get<boolean>('Livechat_accept_chats_with_no_agents'),
	);
}

export async function online(department?: string, skipNoAgentSetting = false, skipFallbackCheck = false): Promise<boolean> {
	livechatLogger.debug({ msg: 'Checking online agents', department });
	if (!skipNoAgentSetting && settings.get('Livechat_accept_chats_with_no_agents')) {
		livechatLogger.debug('Can accept without online agents: true');
		return true;
	}

	if (settings.get('Livechat_assign_new_conversation_to_bot')) {
		livechatLogger.debug({ msg: 'Fetching online bot agents for department', department });
		// get & count where doing the same, but get was getting data, while count was only counting.  We only need the count here
		const botAgents = await countBotAgents(department);
		if (botAgents) {
			livechatLogger.debug({ msg: 'Found online bot agents', botAgents });
			if (botAgents > 0) {
				return true;
			}
		}
	}

	const agentsOnline = await checkOnlineAgents(department, undefined, skipFallbackCheck);
	livechatLogger.debug({ msg: 'Online agents status', department, agentsOnline });
	return agentsOnline;
}

export async function checkOnlineAgents(department?: string, agent?: { agentId: string }, skipFallbackCheck = false): Promise<boolean> {
	if (agent?.agentId) {
		return Users.checkOnlineAgents(
			agent.agentId,
			settings.get<boolean>('Livechat_enabled_when_agent_idle'),
			settings.get<boolean>('Livechat_accept_chats_with_no_agents'),
		);
	}

	if (department) {
		const onlineForDep = await checkOnlineForDepartment(department);
		if (onlineForDep || skipFallbackCheck) {
			return !!onlineForDep;
		}

		const dep = await LivechatDepartment.findOneById<Pick<ILivechatDepartment, '_id' | 'fallbackForwardDepartment'>>(department, {
			projection: { fallbackForwardDepartment: 1 },
		});
		if (!dep?.fallbackForwardDepartment) {
			return !!onlineForDep;
		}

		return checkOnlineAgents(dep?.fallbackForwardDepartment);
	}

	return Users.checkOnlineAgents(
		undefined,
		settings.get<boolean>('Livechat_enabled_when_agent_idle'),
		settings.get<boolean>('Livechat_accept_chats_with_no_agents'),
	);
}

async function countBotAgents(department?: string) {
	if (department) {
		return LivechatDepartmentAgents.countBotsForDepartment(department);
	}

	return Users.countBotAgents();
}