import * as dotenv from 'dotenv';
import {Event} from './Event.interface';
import {PartyPlanerDB} from '../PartyPlaner.db';

dotenv.config();

/**
 * Returns all events of the given user
 * @param useDev If the dev or prod database should be used
 * @param userId The userId of the user to fetch the friends for
 * @return Event[] A list of events
 */
export const getEventData = async (useDev: boolean, userId: string): Promise<Event[]> => {
    let conn = PartyPlanerDB.getConnection(useDev);
    try {
        let eventRows = await conn.query('SELECT event_id, name, description, takes_place_date, registration_until_date, max_participants FROM events WHERE creator_id = ?', userId);

        let eventsMap = new Map<string, Event>();
        let eventIds: string[] = [];

        for (let row of eventRows) {
            eventIds.push(row.event_id);
            let event = {
                eventId: row.event_id,
                name: row.name,
                description: row.description,
                takesPlaceDate: row.takes_place_date,
                registrationUntilDate: row.registration_until_date,
                maxParticipants: row.max_participants,
                invites: [],
                registrations: []
            };
            eventsMap.set(row.event_id, event);
        }

        let registrationRows = await conn.query('SELECT registration_id, name, registered_date, takes_part, comment, event_id FROM event_registration WHERE event_id IN (?)', eventIds);

        for (let row of registrationRows) {
            let event = eventsMap.get(row.event_id);
            if (!event) continue;
            event.registrations.push({
                registrationId: row.registration_id,
                name: row.name,
                registeredDate: row.registered_date,
                takesPart: row.takes_part,
                comment: row.comment
            });
        }

        let inviteRows = await conn.query('SELECT invite_id, invite_key, valid_until, already_used, invited_person_name, event_id FROM invitations WHERE event_id IN (?)', eventIds);

        for (let row of inviteRows) {
            let event = eventsMap.get(row.event_id);
            if (!event) continue;
            event.invites.push({
                inviteId: row.invite_id,
                inviteKey: row.invite_key,
                validUntil: row.valid_until,
                alreadyUsed: row.already_used,
                invitedPersonName: row.invited_person_name
            });
        }

        let eventsList: Event[] = [];
        for (let event of eventsMap.values()) {
            eventsList.push(event);
        }

        return eventsList;
    } catch (err) {
        throw err;
    }
};