/*

Dla każdej osoby w każdy dzień losować czy uda się do hotelu.
Jeśli tak, to do jakiego.

Optymalizacja: Jak odnotować kolizję:
    np. słownik (para osób, liczba)

*/

const numPeople = 1000;
const matchProbability = 1;
const numHotels = 100;
const numDays = 100;

const numPeopleInHotel = [];
const people = [];
const hotels = [];
const meetings = {};

let currentSimulationDay = 0;

class Person {
    constructor(personID) {
        this.ID = personID;
        this.currentHotel = null;
    }

    selectHotel() {
        this.currentHotel = Math.floor(Math.random()*numHotels);
        console.log(`[${currentSimulationDay}] ${this.ID} -> ${this.currentHotel}`)
        return this.currentHotel;
    };
}

class Hotel {
    constructor(hotelID) {
        this.ID = hotelID;
        this.currentNumPeople = 0;
        this.peopleInside = [];
    }

    visitHotel(personID) {
        this.currentNumPeople++;
        this.peopleInside.push(personID);
    }

    newDay() {
        this.currentNumPeople = 0;
        this.peopleInside = [];
    }
}


for (let i=0; i<numPeople; i++) {
    people[i] = new Person(i);
}

for (let i=0; i<numHotels; i++) {
    hotels[i] = new Hotel(i);
}

while (currentSimulationDay++ < numDays) {
    
    // all people decide to go to hotel or not
    people.forEach(person => {

        if (Math.random() < matchProbability) {
            // if the person goes to the hotel, select a random hotel he goes to
            const selectedHotel = person.selectHotel();
            hotels[selectedHotel].visitHotel(person.ID);
        }

    });

    // console.log('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~');
    // console.log('Podsumowanie dnia ' + currentSimulationDay);
    hotels.forEach(hotel => {
        // console.log(`${hotel.ID} -> ${hotel.currentNumPeople}.`);
        
        hotel.peopleInside.forEach(personA => {
            hotel.peopleInside.forEach(personB => {
                if (personA !== personB) {
                    if (!meetings[[personA, personB]]) {
                        meetings[[personA, personB]] = 0;
                    };
                    meetings[[personA, personB]]++;
                }
            });
        });

        hotel.newDay();
    });   
}

console.log(meetings);