using Svg;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.Json;

namespace McsrGraphImageDownloader;

internal class Program {
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
    public const int SPI_SETDESKWALLPAPER = 20;
    public const int SPIF_UPDATEINIFILE = 1;
    public const int SPIF_SENDCHANGE = 2;
    private const string outputFilename = "mcsrChart.png";

    private static async Task Main(string[] args) {
        using var hc = new HttpClient();
        while (true) {
            var svgJson = await hc.GetStringAsync("https://mcsr.ghxx.dev/api/chart");
            var svgText = JsonDocument.Parse(svgJson).RootElement.GetProperty("data").GetString();
            var svg = SvgDocument.Open<SvgDocument>(new MemoryStream(Encoding.UTF8.GetBytes(svgText!)));
            using (var bitmap = svg.Draw(1920, 1080)) {
                bitmap.Save(outputFilename);
            }
            SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Path.GetFullPath(outputFilename), SPIF_UPDATEINIFILE | SPIF_SENDCHANGE);

            await Task.Delay(TimeSpan.FromMinutes(15));
        }
    }
}