namespace Chessistics.Engine.Model;

/// <summary>
/// Deep copy of every mutable field needed to restore a BoardState to an
/// earlier point. Used by QuickSave/QuickLoad for rapid iteration during
/// UI/UX testing and by the harness to restore checkpoints.
///
/// Immutable refs (defs, CampaignDef) are shared; mutable state (Pieces,
/// DemandState, buffers, stock, campaign progression) is copied by value.
/// </summary>
public sealed class WorldSave
{
    public int Width { get; init; }
    public int Height { get; init; }
    public CellType[,] Grid { get; init; } = new CellType[0, 0];
    public SimPhase Phase { get; init; }
    public int TurnNumber { get; init; }
    public int NextPieceId { get; init; }

    public Dictionary<Coords, ProductionDef> Productions { get; init; } = new();
    public Dictionary<Coords, int> ProductionBuffers { get; init; } = new();
    public Dictionary<Coords, DemandState> Demands { get; init; } = new();
    public Dictionary<Coords, TransformerDef> Transformers { get; init; } = new();
    public Dictionary<Coords, int> TransformerInputBuffers { get; init; } = new();
    public Dictionary<Coords, int> TransformerOutputBuffers { get; init; } = new();
    public List<PieceState> Pieces { get; init; } = new();
    public List<PieceState> DestroyedPieces { get; init; } = new();
    public Dictionary<PieceKind, int> RemainingStock { get; init; } = new();
    public HashSet<Coords> OccupiedCells { get; init; } = new();

    public CampaignSaveData? Campaign { get; init; }
}

public sealed class CampaignSaveData
{
    public int CurrentMissionIndex { get; init; }
    public List<int> CompletedMissions { get; init; } = new();
    public HashSet<PieceKind> AvailablePieceKinds { get; init; } = new();
    public HashSet<PieceUpgrade> AvailableLevels { get; init; } = new();
}