using lilo_stitcher_console;
using System.Diagnostics;
using Microsoft.Extensions.Caching.Memory;

namespace LiloStitcher;

public static class Program
{
  public static async Task<int> Main( string[] args )
  {
    try
    {
      NetVips.NetVips.Init();
      NetVips.NetVips.Concurrency = 3;
      
      Stopwatch sw = Stopwatch.StartNew();
      var begin = sw.ElapsedMilliseconds;
      var opt = new Options
      {
        CanvasRect = "A1:AE55",
        CropOffset = new[] { 0.4, 0.4 },
        CropSize = new[] { 0.8, 0.8 },
        OutputScale = 0.5,
        OutputPath = "stitched.png"
      };

      string tileFilePath = "../tiles1705"; // should later be directed to the read-only `ASSET_PATH_RO` environment variable
      string assetDir = Path.GetFullPath(Path.Combine(Directory.GetCurrentDirectory(), tileFilePath));

      using var memCache = new MemoryCache(new MemoryCacheOptions { SizeLimit = 128L * 1024 * 1024 });
      var tileCache = new TileCache(memCache);
      var loader = new TileLoader(tileCache, assetDir);
      var stitcher = new lilo_stitcher_console.LiloStitcher(loader);

      var req = new GenerateRequest(
        opt.CanvasRect!,
        opt.CropOffset!,
        opt.CropSize!,
        opt.OutputScale
      );

      Console.WriteLine("Stitching...");
      var png = await stitcher.CreateImageAsync(req, CancellationToken.None);
      File.Move( png, opt.OutputPath!, overwrite: true );
      
      long bytes = new FileInfo( opt.OutputPath! ).Length;
      Console.WriteLine($"Done. Wrote {opt.OutputPath}  ({bytes / 1024.0:F1} KB)");

      Console.WriteLine(sw.ElapsedMilliseconds - begin);
      
      return 0;
    }
    catch( Exception ex )
    {
      Console.Error.WriteLine( "ERROR: " + ex.Message );
      return 1;
    }
  }

  private struct Options
  {
    public string? CanvasRect { get; set; }
    public double[]? CropOffset { get; set; }
    public double[]? CropSize { get; set; }
    public double OutputScale { get; set; }
    public string? OutputPath { get; set; }
  }
}