using SkiaSharp;
using System.Threading.Tasks;

public class MatrixRenderer
{
    private readonly WledDdpClient _wled;
    private readonly int _width = 64;
    private readonly int _height = 64;
    private readonly string _fontType = "monospace";

    public MatrixRenderer(string wledIp)
    {
        _wled = new WledDdpClient(wledIp);
    }

    //
    public async Task DrawAndSendFrameAsync(float currentTemp, int currentWater, DateTime currentTime)
    //public async Task DrawAndSendFrameAsync(string currentTemp)
    {
        using SKBitmap bitmap = new SKBitmap(_width, _height, SKColorType.Rgba8888, SKAlphaType.Premul);
        using SKCanvas canvas = new SKCanvas(bitmap);

        canvas.Clear(SKColors.Black);

        // --- DRAW CLOCK ---
        using SKPaint clockPaint = new SKPaint { Color = SKColors.Red, IsAntialias = false };
        using SKTypeface typeface = SKTypeface.FromFamilyName(_fontType);
        using SKFont clockFont = new SKFont(typeface, 14);
        //string timeFormat = (currentTime.Second % 2 == 0) ? "HH:mm" : "HH mm";
        string timeFormat = "HH:mm:ss";
        string timeString = currentTime.ToString(timeFormat);
        canvas.DrawText(timeString, 4, 16, SKTextAlign.Left, clockFont, clockPaint);

        // --- DRAW TEMPERATURE ---
        using SKPaint textPaintTemp = new SKPaint { Color = SKColors.Green, IsAntialias = false };
        using SKTypeface typefaceTemp = SKTypeface.FromFamilyName(_fontType);
        using SKFont textFont = new SKFont { Size = 14 };
        canvas.DrawText($"{currentTemp:F1}ºc", 4, 33, SKTextAlign.Left, textFont, textPaintTemp);
        //Water
        using SKPaint textPaintWater = new SKPaint { Color = SKColors.Blue, IsAntialias = false };
        using SKTypeface typefaceWater = SKTypeface.FromFamilyName(_fontType);
        using SKFont textFontWater = new SKFont { Size = 14 };
        canvas.DrawText($"{currentWater:F1}%", 4, 50, SKTextAlign.Left, textFontWater, textPaintWater);

        // 4. Convert 32-bit RGBA to 24-bit RGB for WLED
        byte[] rgbaBytes = bitmap.Bytes;
        byte[] rgbBytes = new byte[_width * _height * 3];

        int rgbIndex = 0;
        for (int i = 0; i < rgbaBytes.Length; i += 4)
        {
            rgbBytes[rgbIndex++] = rgbaBytes[i];     // R
            rgbBytes[rgbIndex++] = rgbaBytes[i + 1]; // G
            rgbBytes[rgbIndex++] = rgbaBytes[i + 2]; // B
            // We ignore rgbaBytes[i + 3] (Alpha channel)
        }

        // 5. Fire it over UDP!
        await _wled.SendFrameAsync(rgbBytes);
    }
}