using System;
using GodotHostTest.Interfaces;
using R3;

namespace GodotHostTest.Game.Score;

public class TotalScore : IScore, IDisposable
{
    public TotalScore(ITargetEventBus targetEventBus)
    {
        Score =
            // map every hit target to +20 points
            targetEventBus.Hit.Select(_ => 20)
                // map every missed target to -5 points
                .Merge(targetEventBus.TimedOut.Select(_ => -5))
                // sum them all (starting with 0)
                .Scan(0, (x1, x2) => x1 + x2)
                .ToReadOnlyReactiveProperty();
    }

    public void Dispose()
    {
        Score.Dispose();
        GC.SuppressFinalize(this);
    }

    public ReadOnlyReactiveProperty<int> Score { get; }
}