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using Microsoft.EntityFrameworkCore;
using BackendPIA.Models;
namespace BackendPIA.Services {
public class GameService : IGameService {
private readonly ApplicationDbContext _context;
public GameService(ApplicationDbContext context) {
_context = context;
}
public async Task<IEnumerable<RaffleWinner>> GetWinners(long raffle_id) {
var raffle = await _context.Raffles.Include(r => r.Tickets).ThenInclude(t => t.Owner).FirstOrDefaultAsync(r => r.Id == raffle_id);
Queue<long> prizes = new Queue<long>(_context.Prizes.Where(p => p.RaffleId == raffle_id).OrderBy(p => p.Tier).Select(p => p.Id));
// var tickets = await _context.Tickets.Where(t => t.RaffleId == raffle_id).Select(t => t.Number).ToListAsync();
List<int> winners = GetTicketNumbers(raffle.Winners, raffle.Tickets);
foreach(int winner in winners) {
var raffle_winner = new RaffleWinner { UserAccountId = raffle.Tickets.Where(t => t.Number == winner).First().UserAccountId,
PrizeId = prizes.Dequeue(), RaffleId = raffle_id };
await _context.AddAsync(raffle_winner);
}
raffle.IsClosed = true;
await _context.SaveChangesAsync();
return await _context.RaffleWinners.Include(rw => rw.UserAccount).Include(rw => rw.Raffle).Include(rw => rw.Prize)
.Where(rw => rw.RaffleId == raffle_id).ToListAsync();
}
private List<int> GetTicketNumbers(int limit, ICollection<Ticket> tickets) {
List<int> winners = new List<int>();
Random rng = new Random();
while(winners.Count < limit) {
int i = rng.Next(tickets.Count - 1);
if(winners.Contains(tickets.ElementAt(i).Number)) // Check for duplicate numbers.
continue;
winners.Add(tickets.ElementAt(i).Number);
tickets.ElementAt(i).IsWinner = true;
}
return winners;
}
}
}
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