namespace MatrixImageEditor;

internal static class ResponsiveLayout
{
    public static void FitAndCenter(Form form, Size preferredLogical, Size minimumLogical, double workingAreaFraction, Screen? screen = null)
    {
        screen ??= Screen.FromControl(form);
        var workingArea = screen.WorkingArea;
        var scale = Math.Max(form.DeviceDpi, 96) / 96F;
        var preferred = Scale(preferredLogical, scale);
        var minimum = Scale(minimumLogical, scale);
        var maximum = new Size(
            Math.Max(320, (int)Math.Floor(workingArea.Width * workingAreaFraction)),
            Math.Max(240, (int)Math.Floor(workingArea.Height * workingAreaFraction)));

        var width = Math.Min(preferred.Width, maximum.Width);
        var height = Math.Min(preferred.Height, maximum.Height);
        form.MinimumSize = new Size(Math.Min(minimum.Width, maximum.Width), Math.Min(minimum.Height, maximum.Height));
        form.Size = new Size(Math.Max(width, form.MinimumSize.Width), Math.Max(height, form.MinimumSize.Height));
        form.Location = new Point(
            workingArea.Left + Math.Max(0, (workingArea.Width - form.Width) / 2),
            workingArea.Top + Math.Max(0, (workingArea.Height - form.Height) / 2));
    }

    private static Size Scale(Size logical, float scale) => new(
        Math.Max(1, (int)Math.Round(logical.Width * scale)),
        Math.Max(1, (int)Math.Round(logical.Height * scale)));
}