using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEngine.Experimental.Rendering.HDPipeline;
using UnityEditor.Experimental.Rendering;

namespace UnityEditor.Experimental.Rendering.HDPipeline
{
    [VolumeComponentEditor(typeof(VolumetricFog))]
    public class VolumetricFogEditor : AtmosphericScatteringEditor
    {
        private SerializedDataParameter m_Albedo;
        private SerializedDataParameter m_MeanFreePath;
        private SerializedDataParameter m_Anisotropy;
        private SerializedDataParameter m_GlobalLightProbeDimmer;

        static GUIContent s_AlbedoLabel                 = new GUIContent("Single Scattering Albedo", "Hue and saturation control the color of the fog (the wavelength of in-scattered light). Value controls scattering (0 = max absorption & no scattering, 1 = no absorption & max scattering).");
        static GUIContent s_MeanFreePathLabel           = new GUIContent("Mean Free Path", "Controls the density, which determines how far you can seen through the fog. It's the distance in meters at which 50% of background light is lost in the fog (due to absorption and out-scattering).");
        static GUIContent s_AnisotropyLabel             = new GUIContent("Anisotropy", "Controls the angular distribution of scattered light. 0 is isotropic, 1 is forward scattering, -1 is backward scattering.");
        static GUIContent s_GlobalLightProbeDimmerLabel = new GUIContent("Global Light Probe Dimmer", "Reduces the intensity of the global light probe.");

        public override void OnEnable()
        {
            base.OnEnable();
            var o = new PropertyFetcher<VolumetricFog>(serializedObject);

            m_Albedo                 = Unpack(o.Find(x => x.albedo));
            m_MeanFreePath           = Unpack(o.Find(x => x.meanFreePath));
            m_Anisotropy             = Unpack(o.Find(x => x.anisotropy));
            m_GlobalLightProbeDimmer = Unpack(o.Find(x => x.globalLightProbeDimmer));
        }

        public override void OnInspectorGUI()
        {
            PropertyField(m_Albedo,                 s_AlbedoLabel);
            PropertyField(m_MeanFreePath,           s_MeanFreePathLabel);
            PropertyField(m_Anisotropy,             s_AnisotropyLabel);
            PropertyField(m_GlobalLightProbeDimmer, s_GlobalLightProbeDimmerLabel);
        }
    }
}