using Chessistics.Engine.Commands;
using Chessistics.Engine.Events;
using Chessistics.Engine.Model;

namespace Chessistics.Engine.Simulation;

public class GameSim
{
    private readonly BoardState _state;

    public GameSim(LevelDef level)
    {
        _state = BoardState.FromLevel(level);
    }

    public GameSim(CampaignDef campaign)
    {
        _state = BoardState.FromCampaign(campaign);
    }

    public IReadOnlyList<IWorldEvent> ProcessCommand(IWorldCommand command)
    {
        var changeList = new List<IWorldEvent>();
        try
        {
            command.Apply(_state, changeList);
        }
        catch (CommandRejectedException ex)
        {
            return [ex.RejectionEvent];
        }
        return changeList;
    }

    public BoardSnapshot GetSnapshot() => new(_state);
}