/**
 * Required External Modules and Interfaces
 */

import express, {Request, Response} from 'express';
import * as EventService from './events.service';
import * as iCalService from './icalgenerator.service';
import {Guid} from 'guid-typescript';
import logger from '../../../middleware/logger';

import * as dotenv from 'dotenv';


/**
 * Router Definition
 */

export const eventsRouter = express.Router();

/**
 * Constants
 */
const fileNames = ['Nachklang_calendar', 'Nachklang_internal_calendar', 'Nachklang_management_calendar'];


/**
 * Controller Definitions
 */

eventsRouter.get('/json', async (req: Request, res: Response) => {
	try {
		// Get request params
		let calendarId: number = parseInt(req.query.calendar as string ?? '', 10);

		// Get events
		let events = await EventService.getAllEvents(calendarId);

		// Send the events back
		res.status(200).send(events);
	} catch (e: any) {
		console.log('Error handling a request: ' + e.message);
		res.status(500).send(JSON.stringify({'message': 'Internal Server Error. Try again later.'}));
	}
});

eventsRouter.get('/ical', async (req: Request, res: Response) => {
	try {
		// Get request params
		let calendarId: number = parseInt(req.query.calendar as string ?? '', 10);

		// Get events
		let events = await EventService.getAllEvents(calendarId);

		// generate file name
		let fileName = fileNames[calendarId];
		let file = await iCalService.convertToIcal(events);

		// Send the ical file back
		res.set({'Content-Disposition': 'attachment; filename=' + fileName + '.ics'});
		res.status(200).send(file);
	} catch (e: any) {
		let errorGuid = Guid.create().toString();
		logger.error('Error handling a request: ' + e.message, {reference: errorGuid});
		logger.error('DB Username from dotenv: ' + process.env.DB_USER, {reference: errorGuid});
		res.status(500).send({
			'status': 'PROCESSING_ERROR',
			'message': 'Internal Server Error. Try again later.',
			'reference': errorGuid
		});
	}
});