using Sandbox;
using Sandbox.Rendering;

/// <summary>
/// Directional blur - motion blur effect along specific angle
/// </summary>
[Title( "Directional Blur" )]
[Category( "Post Processing" )]
[Icon( "blur_on" )]
public sealed class CCSDirectionalBlur : BasePostProcess<CCSDirectionalBlur>
{
	/// <summary>
	/// Direction angle in degrees (0 = right, 90 = up, 180 = left, 270 = down)
	/// </summary>
	[Property, Title("Angle"), Range(0.0f, 360.0f)]
	public float Angle { get; set; } = 0.0f;

	/// <summary>
	/// Blur length in pixels
	/// </summary>
	[Property, Title("Length"), Range(0.0f, 50.0f)]
	public float Length { get; set; } = 10.0f;

	/// <summary>
	/// Number of samples (higher = better quality, slower)
	/// </summary>
	[Property, Title("Samples"), Range(1, 32)]
	public int Samples { get; set; } = 8;

	/// <summary>
	/// Effect strength (0 = original, 1 = full blur)
	/// </summary>
	[Property, Title("Strength"), Range(0.0f, 1.0f)]
	public float Strength { get; set; } = 1.0f;

	public override void Render()
	{
		Attributes.Set("Angle", Angle);
		Attributes.Set("Length", Length);
		Attributes.Set("Samples", Samples);
		Attributes.Set("Strength", Strength);

		var material = Material.FromShader("postprocess/fl4_directionalblur.shader");
		if (material == null)
		{
			Log.Error("CCSDirectionalBlur: Shader not found!");
			return;
		}

		var blit = BlitMode.WithBackbuffer(material, Stage.AfterPostProcess, 4000, false);
		Blit(blit, "CCSDirectionalBlur");
	}
}