using System.Drawing.Drawing2D;

namespace Sunfish.WinForms;

/// <summary>
/// Imagenes de la interfaz (las de la 2.0, en Resources/), escaladas a los PPP de la pantalla
/// para que no queden diminutas en monitores con escalado.
/// </summary>
internal static class UiImages
{
    private static readonly Dictionary<(string, int), Image> Cache = new();

    public static float Scale { get; } = GetScale();

    private static float GetScale()
    {
        using var g = Graphics.FromHwnd(IntPtr.Zero);
        return Math.Max(1f, g.DpiX / 96f);
    }

    public static int Px(int size) => (int)Math.Round(size * Scale);

    /// <summary>Imagen "nombre" (sin .png) a <paramref name="size"/> pixeles logicos.</summary>
    public static Image Get(string name, int size = 16)
    {
        int px = Px(size);
        if (Cache.TryGetValue((name, px), out var cached))
            return cached;
        using var stream = typeof(UiImages).Assembly.GetManifestResourceStream($"ui/{name}.png")
            ?? throw new InvalidOperationException("Missing image " + name);
        using var original = Image.FromStream(stream);
        var bitmap = new Bitmap(px, px);
        using (var g = Graphics.FromImage(bitmap))
        {
            g.InterpolationMode = px % original.Width == 0 ? InterpolationMode.NearestNeighbor : InterpolationMode.HighQualityBicubic;
            g.PixelOffsetMode = PixelOffsetMode.Half;
            g.DrawImage(original, 0, 0, px, px);
        }
        Cache[(name, px)] = bitmap;
        return bitmap;
    }

    /// <summary>Boton cuadrado solo con imagen y la descripcion como ayuda emergente.</summary>
    public static Button IconButton(string image, string tooltip, ToolTip tips)
    {
        var button = new Button
        {
            Image = Get(image),
            Size = new Size(26, 26),
            UseVisualStyleBackColor = true,
            AccessibleName = tooltip.Replace("&", ""),
        };
        tips.SetToolTip(button, tooltip.Replace("&", ""));
        return button;
    }
}