namespace API.Models.Game;

public readonly struct Coordinates(int x, int y)
{
    public readonly int X = x;
    public readonly int Y = y;
}

public enum PlaceResult
{
    OutOfGameField,
    NotAllowedPlayer,
    OccupiedRed,
    OccupiedYellow,
    InvalidFieldValue,
    Placed
}

public enum FieldState
{
    OutOfGameField,
    Empty,
    OccupiedRed,
    OccupiedYellow,
    InvalidFieldValue
}

public class GameField(Coordinates gFs)
{
    public int[,] CurrentField { get; } = new int[gFs.Y, gFs.X];
    public int[,] BackupField { get; } = new int[gFs.Y, gFs.X];

    public PlaceResult Place(Coordinates coordinates, int player)
    {
        if (coordinates.X < 0 || coordinates.X >= CurrentField.GetLength(1) ||
            coordinates.Y < 0 || coordinates.Y >= CurrentField.GetLength(0))
            return PlaceResult.OutOfGameField;

        if (player != 1 && player != 2)
            return PlaceResult.NotAllowedPlayer;

        var currentValue = CurrentField[coordinates.Y, coordinates.X];

        if (currentValue != 0)
            return currentValue switch
            {
                1 => PlaceResult.OccupiedRed,
                2 => PlaceResult.OccupiedYellow,
                _ => PlaceResult.InvalidFieldValue
            };

        CreateSave();
        CurrentField[coordinates.Y, coordinates.X] = player;

        return PlaceResult.Placed;
    }

    public FieldState CheckField(Coordinates coordinates)
    {
        if (coordinates.X < 0 || coordinates.X >= CurrentField.GetLength(1) ||
            coordinates.Y < 0 || coordinates.Y >= CurrentField.GetLength(0))
            return FieldState.OutOfGameField;

        var currentValue = CurrentField[coordinates.Y, coordinates.X];

        return currentValue switch
        {
            0 => FieldState.Empty,
            1 => FieldState.OccupiedRed,
            2 => FieldState.OccupiedYellow,
            _ => FieldState.InvalidFieldValue
        };
    }

    private void CreateSave()
    {
        Array.Copy(CurrentField, BackupField, CurrentField.Length);
    }
}