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

namespace LiloStitcher;
public static class Program
{
    public static async Task<int> Main(string[] args)
    {
        try
        {
            Stopwatch sw = Stopwatch.StartNew();
            var begin = sw.ElapsedMilliseconds;
            var opt = new Options
            {
                CanvasRect = "A1:AE55",
                CropOffset = [0.0, 0.0],
                CropSize = [1.0, 1.0],
                OutputScale = 1.0,
                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 = 256L * 1024 * 1024 });
            var tileCache = new TileCache(memCache);
            var loader = new TileLoader(tileCache, assetDir);
            var stitcher = new LiloStitcher(loader);

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

            Console.WriteLine("Stitching...");
            var pngBytes = await stitcher.CreateImageAsync(req, CancellationToken.None);

            File.WriteAllBytes(opt.OutputPath!, pngBytes);
            Console.WriteLine($"Done. Wrote {opt.OutputPath}  ({pngBytes.Length / 1024.0:F1} KB)");

            Console.WriteLine(begin - sw.ElapsedMilliseconds);
            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; }
    }
}