using System;
using UnityEditor;
using UnityEngine;

namespace UnityStandardAssets.ImageEffects
{
    [CustomEditor (typeof(BloomAndFlares))]
    class BloomAndFlaresEditor : Editor
    {
        SerializedProperty tweakMode;
        SerializedProperty screenBlendMode;

        SerializedObject serObj;

        SerializedProperty hdr;
        SerializedProperty sepBlurSpread;
        SerializedProperty useSrcAlphaAsMask;

        SerializedProperty bloomIntensity;
        SerializedProperty bloomthreshold;
        SerializedProperty bloomBlurIterations;

        SerializedProperty lensflares;

        SerializedProperty hollywoodFlareBlurIterations;

        SerializedProperty lensflareMode;
        SerializedProperty hollyStretchWidth;
        SerializedProperty lensflareIntensity;
        SerializedProperty lensflarethreshold;
        SerializedProperty flareColorA;
        SerializedProperty flareColorB;
        SerializedProperty flareColorC;
        SerializedProperty flareColorD;

        SerializedProperty lensFlareVignetteMask;

        void OnEnable () {
            serObj = new SerializedObject (target);

            screenBlendMode = serObj.FindProperty("screenBlendMode");
            hdr = serObj.FindProperty("hdr");

            sepBlurSpread = serObj.FindProperty("sepBlurSpread");
            useSrcAlphaAsMask = serObj.FindProperty("useSrcAlphaAsMask");

            bloomIntensity = serObj.FindProperty("bloomIntensity");
            bloomthreshold = serObj.FindProperty("bloomThreshold");
            bloomBlurIterations = serObj.FindProperty("bloomBlurIterations");

            lensflares = serObj.FindProperty("lensflares");

            lensflareMode = serObj.FindProperty("lensflareMode");
            hollywoodFlareBlurIterations = serObj.FindProperty("hollywoodFlareBlurIterations");
            hollyStretchWidth = serObj.FindProperty("hollyStretchWidth");
            lensflareIntensity = serObj.FindProperty("lensflareIntensity");
            lensflarethreshold = serObj.FindProperty("lensflareThreshold");
            flareColorA = serObj.FindProperty("flareColorA");
            flareColorB = serObj.FindProperty("flareColorB");
            flareColorC = serObj.FindProperty("flareColorC");
            flareColorD = serObj.FindProperty("flareColorD");
            lensFlareVignetteMask = serObj.FindProperty("lensFlareVignetteMask");

            tweakMode = serObj.FindProperty("tweakMode");
        }


        public override void OnInspectorGUI () {
            serObj.Update();

            GUILayout.Label("HDR " + (hdr.enumValueIndex == 0 ? "auto detected, " : (hdr.enumValueIndex == 1 ? "forced on, " : "disabled, ")) + (useSrcAlphaAsMask.floatValue < 0.1f ? " ignoring alpha channel glow information" : " using alpha channel glow information"), EditorStyles.miniBoldLabel);

            EditorGUILayout.PropertyField (tweakMode, new GUIContent("Tweak mode"));
            EditorGUILayout.PropertyField (screenBlendMode, new GUIContent("Blend mode"));
            EditorGUILayout.PropertyField (hdr, new GUIContent("HDR"));

            // display info text when screen blend mode cannot be used
            Camera cam = (target as BloomAndFlares).GetComponent<Camera>();
            if (cam != null) {
#if UNITY_5_6_OR_NEWER
                if (screenBlendMode.enumValueIndex==0 && ((cam.allowHDR && hdr.enumValueIndex==0) || (hdr.enumValueIndex==1))) {
#else
                if (screenBlendMode.enumValueIndex==0 && ((cam.hdr && hdr.enumValueIndex==0) || (hdr.enumValueIndex==1))) {
#endif
                EditorGUILayout.HelpBox("Screen blend is not supported in HDR. Using 'Add' instead.", MessageType.Info);
                }
            }

            if (1 == tweakMode.intValue)
                EditorGUILayout.PropertyField (lensflares, new GUIContent("Cast lens flares"));

            EditorGUILayout.Separator ();

            EditorGUILayout.PropertyField (bloomIntensity, new GUIContent("Intensity"));
            bloomthreshold.floatValue = EditorGUILayout.Slider ("threshold", bloomthreshold.floatValue, -0.05f, 4.0f);
            bloomBlurIterations.intValue = EditorGUILayout.IntSlider ("Blur iterations", bloomBlurIterations.intValue, 1, 4);
            sepBlurSpread.floatValue = EditorGUILayout.Slider ("Blur spread", sepBlurSpread.floatValue, 0.1f, 10.0f);

            if (1 == tweakMode.intValue)
                useSrcAlphaAsMask.floatValue = EditorGUILayout.Slider (new  GUIContent("Use alpha mask", "Make alpha channel define glowiness"), useSrcAlphaAsMask.floatValue, 0.0f, 1.0f);
            else
                useSrcAlphaAsMask.floatValue = 0.0f;

            if (1 == tweakMode.intValue) {
                EditorGUILayout.Separator ();

                if (lensflares.boolValue) {

                    // further lens flare tweakings
                    if (0 != tweakMode.intValue)
                        EditorGUILayout.PropertyField (lensflareMode, new GUIContent("Lens flare mode"));
                    else
                        lensflareMode.enumValueIndex = 0;

                    EditorGUILayout.PropertyField(lensFlareVignetteMask, new GUIContent("Lens flare mask", "This mask is needed to prevent lens flare artifacts"));

                    EditorGUILayout.PropertyField (lensflareIntensity, new GUIContent("Local intensity"));
                    lensflarethreshold.floatValue = EditorGUILayout.Slider ("Local threshold", lensflarethreshold.floatValue, 0.0f, 1.0f);

                    if (lensflareMode.intValue == 0) {
                        // ghosting
                        EditorGUILayout.BeginHorizontal ();
                        EditorGUILayout.PropertyField (flareColorA, new GUIContent("1st Color"));
                        EditorGUILayout.PropertyField (flareColorB, new GUIContent("2nd Color"));
                        EditorGUILayout.EndHorizontal ();

                        EditorGUILayout.BeginHorizontal ();
                        EditorGUILayout.PropertyField (flareColorC, new GUIContent("3rd Color"));
                        EditorGUILayout.PropertyField (flareColorD, new GUIContent("4th Color"));
                        EditorGUILayout.EndHorizontal ();
                    }
                    else if (lensflareMode.intValue == 1) {
                        // hollywood
                        EditorGUILayout.PropertyField (hollyStretchWidth, new GUIContent("Stretch width"));
                        hollywoodFlareBlurIterations.intValue = EditorGUILayout.IntSlider ("Blur iterations", hollywoodFlareBlurIterations.intValue, 1, 4);

                        EditorGUILayout.PropertyField (flareColorA, new GUIContent("Tint Color"));
                    }
                    else if (lensflareMode.intValue == 2) {
                        // both
                        EditorGUILayout.PropertyField (hollyStretchWidth, new GUIContent("Stretch width"));
                        hollywoodFlareBlurIterations.intValue = EditorGUILayout.IntSlider ("Blur iterations", hollywoodFlareBlurIterations.intValue, 1, 4);

                        EditorGUILayout.BeginHorizontal ();
                        EditorGUILayout.PropertyField (flareColorA, new GUIContent("1st Color"));
                        EditorGUILayout.PropertyField (flareColorB, new GUIContent("2nd Color"));
                        EditorGUILayout.EndHorizontal ();

                        EditorGUILayout.BeginHorizontal ();
                        EditorGUILayout.PropertyField (flareColorC, new GUIContent("3rd Color"));
                        EditorGUILayout.PropertyField (flareColorD, new GUIContent("4th Color"));
                        EditorGUILayout.EndHorizontal ();
                    }
                }
            } else
                lensflares.boolValue = false; // disable lens flares in simple tweak mode

            serObj.ApplyModifiedProperties();
        }
    }
}