satellite-provider/SatelliteProvider.Common/Configs/StorageConfig.cs

namespace SatelliteProvider.Common.Configs;

public class StorageConfig
{
    public string TilesDirectory { get; set; } = "/tiles";
    public string ReadyDirectory { get; set; } = "/ready";

    public string GetTileSubdirectoryPath(int zoomLevel, int tileX, int tileY)
    {
        var xBucket = tileX / 1000;
        var yBucket = tileY / 1000;
        return Path.Combine(TilesDirectory, zoomLevel.ToString(), xBucket.ToString(), yBucket.ToString());
    }

    public string GetTileFilePath(int zoomLevel, int tileX, int tileY, string timestamp)
    {
        var subdirectory = GetTileSubdirectoryPath(zoomLevel, tileX, tileY);
        var fileName = $"tile_{zoomLevel}_{tileX}_{tileY}_{timestamp}.jpg";
        return Path.Combine(subdirectory, fileName);
    }

    // Inverse of GetTileFilePath: parses tile_{zoom}_{x}_{y}_{ts}.jpg.
    // Co-located with the writer per AZ-366 / C13 so format changes can never
    // drift between the two ends. Pure: no I/O, no logging, no exceptions for
    // malformed input — caller decides how to react to a `false` return.
    public static bool TryExtractTileCoordinates(string filePath, out int tileX, out int tileY)
    {
        tileX = -1;
        tileY = -1;
        ArgumentNullException.ThrowIfNull(filePath);

        var filename = Path.GetFileNameWithoutExtension(filePath);
        var parts = filename.Split('_');

        if (parts.Length >= 4 && parts[0] == "tile" &&
            int.TryParse(parts[2], out var x) &&
            int.TryParse(parts[3], out var y))
        {
            tileX = x;
            tileY = y;
            return true;
        }

        return false;
    }
}