using RobotNet10.RobotApp.Shared;

namespace RobotNet10.RobotApp.SLAM.Cartographer.Helpers;

/// <summary>
/// Shared helper for map name sanitization and legacy metadata migration.
/// Used by CartographerService and MapSaveProcessor.
/// </summary>
public static class MapNameHelper
{
    /// <summary>
    /// Sanitize map name for use as directory name.
    /// Removes invalid filename characters and trims spaces/dots.
    /// </summary>
    public static string Sanitize(string mapName)
    {
        if (string.IsNullOrWhiteSpace(mapName))
            throw new ArgumentException("Map name cannot be null or empty", nameof(mapName));

        var invalidChars = Path.GetInvalidFileNameChars();
        var sanitized = mapName;

        foreach (var c in invalidChars)
        {
            sanitized = sanitized.Replace(c, '_');
        }

        sanitized = sanitized.Trim(' ', '.');

        if (string.IsNullOrWhiteSpace(sanitized))
            throw new ArgumentException("Map name is invalid after sanitization", nameof(mapName));

        return sanitized;
    }

    /// <summary>
    /// Ensures MapInfo has Size calculated from Bounds for legacy map.json files
    /// that don't have Size field populated.
    /// </summary>
    public static MapInfo EnsureMapSize(MapInfo metadata)
    {
        if (metadata.Size.Width == 0 && metadata.Size.Height == 0)
        {
            var width = metadata.Bounds.MaxX - metadata.Bounds.MinX;
            var height = metadata.Bounds.MaxY - metadata.Bounds.MinY;
            return new MapInfo
            {
                Name = metadata.Name,
                FolderPath = metadata.FolderPath,
                CreatedDate = metadata.CreatedDate,
                Resolution = metadata.Resolution,
                Size = new MapSize(width, height),
                Origin = metadata.Origin,
                Bounds = metadata.Bounds,
                TrajectoryNodeCount = metadata.TrajectoryNodeCount
            };
        }
        return metadata;
    }
}