using UnityEngine;
using UnityEditor.Rendering;
using UnityEngine.Rendering.Universal;

namespace UnityEditor.Rendering.Universal
{
    [CustomEditor(typeof(ScreenSpaceLensFlare))]
    class ScreenSpaceLensFlareEditor : VolumeComponentEditor
    {
        protected SerializedDataParameter m_Intensity;
        protected SerializedDataParameter m_TintColor;
        protected SerializedDataParameter m_BloomMip;
        protected SerializedDataParameter m_FirstFlareIntensity;
        protected SerializedDataParameter m_SecondaryFlareIntensity;
        protected SerializedDataParameter m_WarpedFlareIntensity;
        protected SerializedDataParameter m_WarpedFlareScale;
        protected SerializedDataParameter m_Samples;
        protected SerializedDataParameter m_SampleDimmer;
        protected SerializedDataParameter m_VignetteEffect;
        protected SerializedDataParameter m_StartingPosition;
        protected SerializedDataParameter m_Scale;
        protected SerializedDataParameter m_ChromaticAbberationIntensity;
        protected SerializedDataParameter m_StreaksIntensity;
        protected SerializedDataParameter m_StreaksLength;
        protected SerializedDataParameter m_StreaksOrientation;
        protected SerializedDataParameter m_StreaksThreshold;
        protected SerializedDataParameter m_Resolution;

        static GUIContent s_Intensity = EditorGUIUtility.TrTextContent("Intensity", "Sets the global intensity of the Screen Space Lens Flare effect. When set to 0, the pass is skipped. ");
        static GUIContent s_TintColor = EditorGUIUtility.TrTextContent("Tint Color", "Sets the color used to tint all the flares. ");
        static GUIContent s_BloomMip = EditorGUIUtility.TrTextContent("Bloom Mip Bias", "Controls the Bloom mip used as a source for the Lens Flare effect. A high value will result in a blurrier result for all the flares.");
        static GUIContent s_FirstFlareIntensity = EditorGUIUtility.TrTextContent("Regular Multiplier", "Controls the intensity of the Regular Flare sample. Those flares are sampled using scaled screen coordinates.");
        static GUIContent s_SecondaryFlareIntensity = EditorGUIUtility.TrTextContent("Reversed Multiplier", "Controls the intensity of the Reversed Flare sample. Those flares are sampled using scaled and flipped screen coordinates.");
        static GUIContent s_WarpedFlareIntensity = EditorGUIUtility.TrTextContent("Warped Multiplier", "Controls the intensity of the Warped Flare sample. Those flares are sampled using polar screen coordinates.");
        static GUIContent s_WarpedFlareScale = EditorGUIUtility.TrTextContent("Scale", "Sets the scale of the Warped Flare sample. A value of 1,1 will keep this flare circular. Set values below 1 can lead to stretching artifacts on the side of the screen.");
        static GUIContent s_Samples = EditorGUIUtility.TrTextContent("Samples", "Controls the number of times the flare effect is repeated for each flare type (regular, reversed, warped). This parameter has a strong impact on performance.");
        static GUIContent s_SampleDimmer = EditorGUIUtility.TrTextContent("Sample Dimmer", "Controls the value by which each additionnal sample is multiplied. This parameter has an effect only after the first sample.");
        static GUIContent s_VignetteEffect = EditorGUIUtility.TrTextContent("Vignette Effect", "Controls the intensity of the vignette effect to occlude the Lens Flare effect at the center of the screen.");
        static GUIContent s_StartingPosition = EditorGUIUtility.TrTextContent("Starting Position", "Controls the starting position of the flares in screen space relative to their source.");
        static GUIContent s_Scale = EditorGUIUtility.TrTextContent("Scale", "Controls the scale at which the flares are sampled. This parameter only impacts regular, reversed and warped flares.");
        static GUIContent s_ChromaticAbberationIntensity = EditorGUIUtility.TrTextContent("Intensity", "Controls the strength of the Chromatic Aberration effect. The higher the value, the more light is dispersed on the sides of the screen.");
        static GUIContent s_StreaksIntensity = EditorGUIUtility.TrTextContent("Multiplier", "Controls the intensity of streaks effect. This effect has an impact on performance when above zero. When this intensity is zero, this effect is not evaluated to save costs.");
        static GUIContent s_StreaksOrientation = EditorGUIUtility.TrTextContent("Orientation", "Controls the orientation streaks effect in degrees. A value of 0 creates horizontal streaks.");
        static GUIContent s_StreaksLength = EditorGUIUtility.TrTextContent("Length", "Controls the length of streaks effect. A value of one creates streaks about the width of the screen.");
        static GUIContent s_StreaksThreshold = EditorGUIUtility.TrTextContent("Threshold", "Controls the threshold of streak effect. A high value makes the effect more localised on the high intensity areas of the screen. When using a non HDR Camera, a high threshold can remove streaks entirely.");
        static GUIContent s_Resolution = EditorGUIUtility.TrTextContent("Resolution", "Specifies the resolution ratio at which the streaks effect is computed.");

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

            m_Intensity = Unpack(o.Find(x => x.intensity));
            m_TintColor = Unpack(o.Find(x => x.tintColor));
            m_BloomMip = Unpack(o.Find(x => x.bloomMip));
            m_FirstFlareIntensity = Unpack(o.Find(x => x.firstFlareIntensity));
            m_SecondaryFlareIntensity = Unpack(o.Find(x => x.secondaryFlareIntensity));
            m_WarpedFlareIntensity = Unpack(o.Find(x => x.warpedFlareIntensity));
            m_WarpedFlareScale = Unpack(o.Find(x => x.warpedFlareScale));
            m_Samples = Unpack(o.Find(x => x.samples));
            m_SampleDimmer = Unpack(o.Find(x => x.sampleDimmer));
            m_VignetteEffect = Unpack(o.Find(x => x.vignetteEffect));
            m_StartingPosition = Unpack(o.Find(x => x.startingPosition));
            m_Scale = Unpack(o.Find(x => x.scale));
            m_ChromaticAbberationIntensity = Unpack(o.Find(x => x.chromaticAbberationIntensity));
            m_StreaksIntensity = Unpack(o.Find(x => x.streaksIntensity));
            m_StreaksLength = Unpack(o.Find(x => x.streaksLength));
            m_StreaksOrientation = Unpack(o.Find(x => x.streaksOrientation));
            m_StreaksThreshold = Unpack(o.Find(x => x.streaksThreshold));
            m_Resolution = Unpack(o.Find(x => x.resolution));

        }

        public override void OnInspectorGUI()
        {
            PropertyField(m_Intensity, s_Intensity);
            PropertyField(m_TintColor, s_TintColor);
            PropertyField(m_BloomMip, s_BloomMip);

            //Regular Flares
            PropertyField(m_FirstFlareIntensity, s_FirstFlareIntensity);
            PropertyField(m_SecondaryFlareIntensity, s_SecondaryFlareIntensity);
            PropertyField(m_WarpedFlareIntensity, s_WarpedFlareIntensity);

            if(showAdditionalProperties)
            {
                using (new IndentLevelScope())
                {
                    PropertyField(m_WarpedFlareScale, s_WarpedFlareScale);
                }
            }

            //Parameters for Regular Flares
            PropertyField(m_Samples, s_Samples);
            if(showAdditionalProperties)
            {
                using (new IndentLevelScope())
                {
                    PropertyField(m_SampleDimmer, s_SampleDimmer);
                }
            }
            PropertyField(m_VignetteEffect, s_VignetteEffect);
            PropertyField(m_StartingPosition, s_StartingPosition);
            PropertyField(m_Scale, s_Scale);

            //Streaks
            PropertyField(m_StreaksIntensity, s_StreaksIntensity);
            using (new IndentLevelScope())
            {
                PropertyField(m_StreaksLength, s_StreaksLength);
                PropertyField(m_StreaksOrientation, s_StreaksOrientation);
                PropertyField(m_StreaksThreshold, s_StreaksThreshold);
                PropertyField(m_Resolution, s_Resolution);
            }

            //Chromatic Aberration
            PropertyField(m_ChromaticAbberationIntensity, s_ChromaticAbberationIntensity);
        }

    }
}