import { Meteor } from 'meteor/meteor';
import { Match, check } from 'meteor/check';

import { Users } from '../../../../../app/models';
import { LivechatInquiry, OmnichannelQueue } from '../../../../../app/models/server/raw';
import LivechatUnit from '../../../models/server/models/LivechatUnit';
import LivechatTag from '../../../models/server/models/LivechatTag';
import { LivechatRooms, Subscriptions } from '../../../../../app/models/server';
import LivechatPriority from '../../../models/server/models/LivechatPriority';
import { addUserRoles, removeUserFromRoles } from '../../../../../app/authorization/server';
import { processWaitingQueue, removePriorityFromRooms, updateInquiryQueuePriority, updatePriorityInquiries, updateRoomPriorityHistory } from './Helper';
import { RoutingManager } from '../../../../../app/livechat/server/lib/RoutingManager';
import { settings } from '../../../../../app/settings/server';
import { callbacks } from '../../../../../app/callbacks';
import { AutoCloseOnHoldScheduler } from './AutoCloseOnHoldScheduler';

export const LivechatEnterprise = {
	addMonitor(username) {
		check(username, String);

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

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

		if (addUserRoles(user._id, 'livechat-monitor')) {
			return user;
		}

		return false;
	},

	removeMonitor(username) {
		check(username, String);

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

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

		if (removeUserFromRoles(user._id, 'livechat-monitor')) {
			return true;
		}

		return false;
	},

	removeUnit(_id) {
		check(_id, String);

		const unit = LivechatUnit.findOneById(_id, { fields: { _id: 1 } });

		if (!unit) {
			throw new Meteor.Error('unit-not-found', 'Unit not found', { method: 'livechat:removeUnit' });
		}

		return LivechatUnit.removeById(_id);
	},

	saveUnit(_id, unitData, unitMonitors, unitDepartments) {
		check(_id, Match.Maybe(String));

		check(unitData, {
			name: String,
			visibility: String,
			enabled: Match.Optional(Boolean),
			description: Match.Optional(String),
			email: Match.Optional(String),
			showOnOfflineForm: Match.Optional(Boolean),
		});

		check(unitMonitors, [
			Match.ObjectIncluding({
				monitorId: String,
				username: String,
			}),
		]);

		check(unitDepartments, [
			Match.ObjectIncluding({
				departmentId: String,
			}),
		]);

		let ancestors = [];
		if (_id) {
			const unit = LivechatUnit.findOneById(_id);
			if (!unit) {
				throw new Meteor.Error('error-unit-not-found', 'Unit not found', { method: 'livechat:saveUnit' });
			}

			ancestors = unit.ancestors;
		}

		return LivechatUnit.createOrUpdateUnit(_id, unitData, ancestors, unitMonitors, unitDepartments);
	},

	removeTag(_id) {
		check(_id, String);

		const tag = LivechatTag.findOneById(_id, { fields: { _id: 1 } });

		if (!tag) {
			throw new Meteor.Error('tag-not-found', 'Tag not found', { method: 'livechat:removeTag' });
		}

		return LivechatTag.removeById(_id);
	},

	saveTag(_id, tagData, tagDepartments) {
		check(_id, Match.Maybe(String));

		check(tagData, {
			name: String,
			description: Match.Optional(String),
		});

		check(tagDepartments, [String]);

		return LivechatTag.createOrUpdateTag(_id, tagData, tagDepartments);
	},

	savePriority(_id, priorityData) {
		check(_id, Match.Maybe(String));

		check(priorityData, {
			name: String,
			description: Match.Optional(String),
			dueTimeInMinutes: String,
		});

		const oldPriority = _id && LivechatPriority.findOneById(_id, { fields: { dueTimeInMinutes: 1 } });
		const priority = LivechatPriority.createOrUpdatePriority(_id, priorityData);
		if (!oldPriority) {
			return priority;
		}

		const { dueTimeInMinutes: oldDueTimeInMinutes } = oldPriority;
		const { dueTimeInMinutes } = priority;

		if (oldDueTimeInMinutes !== dueTimeInMinutes) {
			updatePriorityInquiries(priority);
		}

		return priority;
	},

	removePriority(_id) {
		check(_id, String);

		const priority = LivechatPriority.findOneById(_id, { fields: { _id: 1 } });

		if (!priority) {
			throw new Meteor.Error('error-invalid-priority', 'Invalid priority', { method: 'livechat:removePriority' });
		}
		const removed = LivechatPriority.removeById(_id);
		if (removed) {
			removePriorityFromRooms(_id);
		}
		return removed;
	},

	updateRoomPriority(roomId, user, priority) {
		updateInquiryQueuePriority(roomId, priority);
		updateRoomPriorityHistory(roomId, user, priority);
	},

	placeRoomOnHold(room) {
		const { _id: roomId, onHold } = room;
		if (!roomId || onHold) {
			return false;
		}
		LivechatRooms.setOnHold(roomId);
		Subscriptions.setOnHold(roomId);

		Meteor.defer(() => {
			callbacks.run('livechat:afterOnHold', room);
		});

		return true;
	},

	async releaseOnHoldChat(room) {
		const { _id: roomId, onHold } = room;
		if (!roomId || !onHold) {
			return;
		}

		await AutoCloseOnHoldScheduler.unscheduleRoom(roomId);
		LivechatRooms.unsetAllOnHoldFieldsByRoomId(roomId);
		Subscriptions.unsetOnHold(roomId);
	},
};

const RACE_TIMEOUT = 1000;

const queueWorker = {
	running: false,
	queues: [],
	async start() {
		if (this.running) {
			return;
		}

		await this.getActiveQueues();
		await OmnichannelQueue.initQueue();
		this.running = true;
		return this.execute();
	},
	async stop() {
		this.running = false;
		return OmnichannelQueue.stopQueue();
	},
	async getActiveQueues() {
		// undefined = public queue(without department)
		return [undefined].concat(await LivechatInquiry.getDistinctQueuedDepartments());
	},
	async nextQueue() {
		if (!this.queues.length) {
			this.queues = await this.getActiveQueues();
		}

		return this.queues.shift();
	},
	async execute() {
		if (!this.running) {
			return;
		}

		const queue = await this.nextQueue();
		setTimeout(this.checkQueue.bind(this, queue), RACE_TIMEOUT);
	},

	async checkQueue(queue) {
		if (await OmnichannelQueue.lockQueue()) {
			await processWaitingQueue(queue);
			await OmnichannelQueue.unlockQueue();
		}

		this.execute();
	},
};

settings.onload('Livechat_Routing_Method', function() {
	RoutingManager.getConfig().autoAssignAgent ? queueWorker.start() : queueWorker.stop();
});