using Fengling.RiskControl.Domain.Aggregates.RiskScores;
using Fengling.RiskControl.Domain.Events;
using Fengling.RiskControl.Domain.Repositories;
using MediatR;

namespace Fengling.RiskControl.Application.Events;

public class LotteryCompletedEventHandler : INotificationHandler<LotteryCompletedEvent>
{
    private const int BIG_WIN_MULTIPLIER = 5;

    private readonly IRiskScoreRepository _scoreRepository;

    public LotteryCompletedEventHandler(IRiskScoreRepository scoreRepository)
    {
        _scoreRepository = scoreRepository;
    }

    public async Task Handle(LotteryCompletedEvent notification, CancellationToken cancellationToken)
    {
        var score = RiskScore.Create(
            notification.MemberId,
            "lottery_result",
            notification.ActivityId.ToString(),
            expiresAt: DateTime.UtcNow.AddDays(1));

        if (notification.IsWin && notification.WinAmount > notification.StakePoints * BIG_WIN_MULTIPLIER)
        {
            score.AddRiskFactor("big_win", 20, "赢得超过投入5倍");
        }

        await _scoreRepository.AddAsync(score);
    }
}