import { Omnichannel } from '@rocket.chat/core-services';
import type {
	ILivechatAgent,
	IOmnichannelInquiryExtraData,
	IOmnichannelRoom,
	IUser,
	SelectedAgent,
	TransferByData,
	TransferData,
} from '@rocket.chat/core-typings';
import { isOmnichannelRoom, OmnichannelSourceType } from '@rocket.chat/core-typings';
import { LivechatVisitors, Users, LivechatRooms } from '@rocket.chat/models';
import {
	isLiveChatRoomForwardProps,
	isPOSTLivechatRoomCloseParams,
	isPOSTLivechatRoomSurveyParams,
	isLiveChatRoomJoinProps,
	isLiveChatRoomSaveInfoProps,
	isPOSTLivechatRoomCloseByUserParams,
	isPOSTLivechatRoomsCloseAll,
	isPOSTLivechatRoomsCloseAllSuccessResponse,
	POSTLivechatRemoveRoomSuccess,
	isPOSTLivechatRemoveRoomParams,
	validateBadRequestErrorResponse,
	validateUnauthorizedErrorResponse,
	validateForbiddenErrorResponse,
	ajv,
} from '@rocket.chat/rest-typings';
import { isPOSTLivechatVisitorDepartmentTransferParams } from '@rocket.chat/rest-typings/src/v1/omnichannel';
import { check, Match } from 'meteor/check';
import { Meteor } from 'meteor/meteor';

import { API } from '../..';
import { findGuest, findRoom, settings, findAgent, onCheckRoomParams } from './lib/livechat';
import { canAccessRoomAsync } from '../../../lib/authorization';
import { hasPermissionAsync } from '../../../lib/authorization/hasPermission';
import { callbacks } from '../../../lib/callbacks';
import { i18n } from '../../../lib/i18n';
import { normalizeTransferredByData } from '../../../lib/omnichannel/Helper';
import { closeLivechatRoom } from '../../../lib/omnichannel/closeLivechatRoom';
import { closeRoom } from '../../../lib/omnichannel/closeRoom';
import { saveGuest } from '../../../lib/omnichannel/guests';
import type { CloseRoomParams } from '../../../lib/omnichannel/localTypes';
import { livechatLogger } from '../../../lib/omnichannel/logger';
import { createRoom, removeOmnichannelRoom, saveRoomInfo } from '../../../lib/omnichannel/rooms';
import { transfer } from '../../../lib/omnichannel/transfer';
import { addUserToRoom } from '../../../lib/rooms/addUserToRoom';
import { settings as rcSettings } from '../../../settings';
import type { ExtractRoutesFromAPI } from '../../ApiClass';
import { isWidget } from '../../lib/isWidget';

const isAgentWithInfo = (agentObj: ILivechatAgent | { hiddenInfo: boolean }): agentObj is ILivechatAgent => !('hiddenInfo' in agentObj);

API.v1.addRoute(
	'livechat/room',
	{
		rateLimiterOptions: {
			numRequestsAllowed: 5,
			intervalTimeInMS: 60000,
		},
	},
	{
		async get() {
			// I'll temporary use check for validation, as validateParams doesnt support what's being done here
			const extraCheckParams = onCheckRoomParams({
				token: String,
				rid: Match.Maybe(String),
				agentId: Match.Maybe(String),
			});

			check(this.queryParams, extraCheckParams);

			const { token, rid, agentId, ...extraParams } = this.queryParams;

			const guest = token && (await findGuest(token));
			if (!guest) {
				throw new Error('invalid-token');
			}

			if (!rid) {
				const room = await LivechatRooms.findOneOpenByVisitorToken(token, {});
				if (room) {
					return API.v1.success({ room, newRoom: false });
				}

				let agent: SelectedAgent | undefined;
				const agentObj = agentId && (await findAgent(agentId));
				if (agentObj) {
					if (isAgentWithInfo(agentObj)) {
						const { username = undefined } = agentObj;
						agent = { agentId, username };
					} else {
						agent = { agentId };
					}
				}

				const roomInfo = {
					source: {
						...(isWidget(this.request.headers)
							? { type: OmnichannelSourceType.WIDGET, destination: this.request.headers.get('host')! }
							: { type: OmnichannelSourceType.API }),
					},
				};

				const newRoom = await createRoom({
					visitor: guest,
					roomInfo,
					agent,
					extraData: extraParams as IOmnichannelInquiryExtraData,
				});

				return API.v1.success({
					room: newRoom,
					newRoom: true,
				});
			}

			const froom = await LivechatRooms.findOneOpenByRoomIdAndVisitorToken(rid, token, {});
			if (!froom) {
				throw new Error('invalid-room');
			}

			return API.v1.success({ room: froom, newRoom: false });
		},
	},
);

// Note: use this route if a visitor is closing a room
// If a RC user(like eg agent) is closing a room, use the `livechat/room.closeByUser` route
API.v1.addRoute(
	'livechat/room.close',
	{ validateParams: isPOSTLivechatRoomCloseParams },
	{
		async post() {
			const { rid, token } = this.bodyParams;

			if (!rcSettings.get('Omnichannel_allow_visitors_to_close_conversation')) {
				throw new Error('error-not-allowed-to-close-conversation');
			}

			const visitor = await findGuest(token);
			if (!visitor) {
				throw new Error('invalid-token');
			}

			const room = await findRoom(token, rid);
			if (!room) {
				throw new Error('invalid-room');
			}

			if (!room.open) {
				throw new Error('room-closed');
			}

			const language = rcSettings.get<string>('Language') || 'en';
			const comment = i18n.t('Closed_by_visitor', { lng: language });

			const options: CloseRoomParams['options'] = {};
			if (room.servedBy) {
				const servingAgent: Pick<IUser, '_id' | 'name' | 'username' | 'utcOffset' | 'settings' | 'language'> | null =
					await Users.findOneById(room.servedBy._id, {
						projection: {
							name: 1,
							username: 1,
							utcOffset: 1,
							settings: 1,
							language: 1,
						},
					});

				if (servingAgent?.settings?.preferences?.omnichannelTranscriptPDF) {
					options.pdfTranscript = {
						requestedBy: servingAgent._id,
					};
				}

				// We'll send the transcript by email only if the setting is disabled (that means, we're not asking the user if he wants to receive the transcript by email)
				// And the agent has the preference enabled to send the transcript by email and the visitor has an email address
				// When Livechat_enable_transcript is enabled, the email will be sent via livechat/transcript route
				if (
					!rcSettings.get<boolean>('Livechat_enable_transcript') &&
					servingAgent?.settings?.preferences?.omnichannelTranscriptEmail &&
					visitor.visitorEmails?.length &&
					visitor.visitorEmails?.[0]?.address
				) {
					const visitorEmail = visitor.visitorEmails?.[0]?.address;

					const language = servingAgent.language || rcSettings.get<string>('Language') || 'en';
					const t = i18n.getFixedT(language);
					const subject = t('Transcript_of_your_livechat_conversation');

					options.emailTranscript = {
						sendToVisitor: true,
						requestData: {
							email: visitorEmail,
							requestedAt: new Date(),
							requestedBy: servingAgent,
							subject,
						},
					};
				}
			}

			await closeRoom({ visitor, room, comment, options });

			return API.v1.success({ rid, comment });
		},
	},
);

API.v1.addRoute(
	'livechat/room.closeByUser',
	{
		validateParams: isPOSTLivechatRoomCloseByUserParams,
		authRequired: true,
		permissionsRequired: ['close-livechat-room'],
	},
	{
		async post() {
			const { rid, comment, tags, generateTranscriptPdf, transcriptEmail, forceClose } = this.bodyParams;

			const allowForceClose = rcSettings.get<boolean>('Omnichannel_allow_force_close_conversations');
			const isForceClosing = allowForceClose && forceClose;

			if (isForceClosing) {
				livechatLogger.warn({ msg: 'Force closing a conversation', user: this.userId, room: rid });
			}

			await closeLivechatRoom(this.user, rid, {
				comment,
				tags,
				generateTranscriptPdf,
				transcriptEmail,
				forceClose: isForceClosing,
			});

			return API.v1.success();
		},
	},
);

API.v1.addRoute(
	'livechat/room.survey',
	{ validateParams: isPOSTLivechatRoomSurveyParams },
	{
		async post() {
			const { rid, token, data } = this.bodyParams;

			const visitor = await findGuest(token);
			if (!visitor) {
				throw new Error('invalid-token');
			}

			const room = await findRoom(token, rid);
			if (!room) {
				throw new Error('invalid-room');
			}

			const config = await settings();
			if (!config.survey?.items || !config.survey.values) {
				throw new Error('invalid-livechat-config');
			}

			const updateData: { [k: string]: string } = {};
			for (const item of data) {
				if ((config.survey.items.includes(item.name) && config.survey.values.includes(item.value)) || item.name === 'additionalFeedback') {
					updateData[item.name] = item.value;
				}
			}

			if (Object.keys(updateData).length === 0) {
				throw new Error('invalid-data');
			}

			if (!(await LivechatRooms.updateSurveyFeedbackById(room._id, updateData))) {
				return API.v1.failure();
			}

			return API.v1.success({ rid, data: updateData });
		},
	},
);

API.v1.addRoute(
	'livechat/room.forward',
	{ authRequired: true, permissionsRequired: ['view-l-room', 'transfer-livechat-guest'], validateParams: isLiveChatRoomForwardProps },
	{
		async post() {
			const transferData = this.bodyParams as typeof this.bodyParams & {
				transferredBy: TransferByData;
				transferredTo?: { _id: string; username?: string; name?: string };
			};

			const room = await LivechatRooms.findOneById(this.bodyParams.roomId);
			if (room?.t !== 'l') {
				throw new Error('error-invalid-room');
			}

			if (!room.open) {
				throw new Error('This_conversation_is_already_closed');
			}

			if (!(await Omnichannel.isWithinMACLimit(room))) {
				throw new Error('error-mac-limit-reached');
			}

			const guest = await LivechatVisitors.findOneEnabledById(room.v?._id);
			if (!guest) {
				throw new Error('error-invalid-visitor');
			}

			transferData.transferredBy = normalizeTransferredByData(this.user, room);
			if (transferData.userId) {
				const userToTransfer = await Users.findOneById(transferData.userId);
				if (userToTransfer) {
					transferData.transferredTo = {
						_id: userToTransfer._id,
						username: userToTransfer.username,
						name: userToTransfer.name,
					};
				}
			}

			const chatForwardedResult = await transfer(room, guest, transferData);
			if (!chatForwardedResult) {
				throw new Error('error-forwarding-chat');
			}

			return API.v1.success();
		},
	},
);

const livechatVisitorDepartmentTransfer = API.v1.post(
	'livechat/visitor/department.transfer',
	{
		response: {
			200: ajv.compile<void>({
				type: 'object',
				properties: {
					success: {
						type: 'boolean',
						enum: [true],
					},
				},
				required: ['success'],
				additionalProperties: false,
			}),
			400: validateBadRequestErrorResponse,
		},
		body: isPOSTLivechatVisitorDepartmentTransferParams,
	},
	async function action() {
		const { rid, token, department } = this.bodyParams;

		const visitor = await findGuest(token);
		if (!visitor) {
			return API.v1.failure('invalid-token');
		}
		const room = await LivechatRooms.findOneById(rid);

		if (room?.t !== 'l') {
			return API.v1.failure('error-invalid-room');
		}

		if (!room.open) {
			return API.v1.failure('This_conversation_is_already_closed');
		}

		// As this is a visitor endpoint, we should not show the mac limit error
		if (!(await Omnichannel.isWithinMACLimit(room))) {
			return API.v1.failure('error-transefing-chat');
		}

		const guest = await LivechatVisitors.findOneEnabledById(room.v?._id);
		if (!guest) {
			return API.v1.failure('error-invalid-visitor');
		}

		const transferredBy = normalizeTransferredByData(
			{ _id: guest._id, username: guest.username, name: guest.name, userType: 'visitor' },
			room,
		);

		const transferData: TransferData = { transferredBy, departmentId: department };

		const chatForwardedResult = await transfer(room, guest, transferData);
		if (!chatForwardedResult) {
			return API.v1.failure('error-transfering-chat');
		}

		return API.v1.success();
	},
);

type LivechatAnalyticsEndpoints = ExtractRoutesFromAPI<typeof livechatVisitorDepartmentTransfer>;
declare module '@rocket.chat/rest-typings' {
	// eslint-disable-next-line @typescript-eslint/naming-convention, @typescript-eslint/no-empty-interface
	interface Endpoints extends LivechatAnalyticsEndpoints {}
}

API.v1.addRoute(
	'livechat/room.join',
	{ authRequired: true, permissionsRequired: ['view-l-room'], validateParams: isLiveChatRoomJoinProps },
	{
		async get() {
			const { roomId } = this.queryParams;

			const { user } = this;

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

			const room = await LivechatRooms.findOneById(roomId);

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

			if (!room.open) {
				throw new Error('room-closed');
			}

			if (!(await Omnichannel.isWithinMACLimit(room))) {
				throw new Error('error-mac-limit-reached');
			}

			if (!(await canAccessRoomAsync(room, user))) {
				throw new Error('error-not-allowed');
			}

			await addUserToRoom(roomId, user);

			return API.v1.success();
		},
	},
);

API.v1.addRoute(
	'livechat/room.saveInfo',
	{ authRequired: true, permissionsRequired: ['view-l-room'], validateParams: isLiveChatRoomSaveInfoProps },
	{
		async post() {
			const { roomData, guestData } = this.bodyParams;
			const room = await LivechatRooms.findOneById(roomData._id);
			if (!room || !isOmnichannelRoom(room)) {
				throw new Error('error-invalid-room');
			}

			if (
				(!room.servedBy || room.servedBy._id !== this.userId) &&
				!(await hasPermissionAsync(this.user, 'save-others-livechat-room-info'))
			) {
				return API.v1.forbidden();
			}

			if (room.sms) {
				delete guestData.phone;
			}

			// We want this both operations to be concurrent, so we have to go with Promise.allSettled
			const result = await Promise.allSettled([saveGuest(guestData, this.userId), saveRoomInfo(roomData)]);

			const firstError = result.find((item) => item.status === 'rejected');
			if (firstError) {
				throw new Error(firstError.reason.error);
			}

			await callbacks.run('livechat.saveInfo', await LivechatRooms.findOneById(roomData._id), {
				user: this.user,
				oldRoom: room,
			});

			return API.v1.success();
		},
	},
);

const livechatRoomsEndpoints = API.v1
	.post(
		'livechat/rooms.delete',
		{
			response: {
				200: POSTLivechatRemoveRoomSuccess,
				400: validateBadRequestErrorResponse,
				401: validateUnauthorizedErrorResponse,
				403: validateForbiddenErrorResponse,
			},
			authRequired: true,
			permissionsRequired: ['remove-closed-livechat-room'],
			body: isPOSTLivechatRemoveRoomParams,
		},
		async function action() {
			const { roomId } = this.bodyParams;

			try {
				await removeOmnichannelRoom(roomId);
				return API.v1.success();
			} catch (error: unknown) {
				if (error instanceof Meteor.Error) {
					return API.v1.failure(error.reason);
				}

				return API.v1.failure('error-removing-room');
			}
		},
	)
	.post(
		'livechat/rooms.removeAllClosedRooms',
		{
			response: {
				200: isPOSTLivechatRoomsCloseAllSuccessResponse,
			},
			authRequired: true,
			permissionsRequired: ['remove-closed-livechat-rooms'],
			body: isPOSTLivechatRoomsCloseAll,
		},
		async function action() {
			livechatLogger.info({ msg: 'User is removing all closed rooms', userId: this.userId });

			const params = this.bodyParams;

			const extraQuery = await callbacks.run('livechat.applyRoomRestrictions', {}, { userId: this.userId });
			const promises: Promise<void>[] = [];
			await LivechatRooms.findClosedRooms(params?.departmentIds, {}, extraQuery).forEach(({ _id }: IOmnichannelRoom) => {
				promises.push(removeOmnichannelRoom(_id));
			});
			await Promise.all(promises);

			livechatLogger.info({ msg: 'User removed closed rooms', userId: this.userId, removedRooms: promises.length });
			return API.v1.success({ removedRooms: promises.length });
		},
	);

type LivechatRoomsEndpoints = ExtractRoutesFromAPI<typeof livechatRoomsEndpoints>;

declare module '@rocket.chat/rest-typings' {
	// eslint-disable-next-line @typescript-eslint/naming-convention, @typescript-eslint/no-empty-interface
	interface Endpoints extends LivechatRoomsEndpoints {}
}