using System;
using UnityEditor;
using UnityEngine;

namespace UnityStandardAssets.ImageEffects
{
    [CustomEditor (typeof(Tonemapping))]
    class TonemappingEditor : Editor
    {
        SerializedObject serObj;

        SerializedProperty type;

        // CURVE specific parameter
        SerializedProperty remapCurve;

        SerializedProperty exposureAdjustment;

        // REINHARD specific parameter
        SerializedProperty middleGrey;
        SerializedProperty white;
        SerializedProperty adaptionSpeed;
        SerializedProperty adaptiveTextureSize;

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

            type = serObj.FindProperty ("type");
            remapCurve = serObj.FindProperty ("remapCurve");
            exposureAdjustment = serObj.FindProperty ("exposureAdjustment");
            middleGrey = serObj.FindProperty ("middleGrey");
            white = serObj.FindProperty ("white");
            adaptionSpeed = serObj.FindProperty ("adaptionSpeed");
            adaptiveTextureSize = serObj.FindProperty("adaptiveTextureSize");
        }


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

            GUILayout.Label("Mapping HDR to LDR ranges since 1982", EditorStyles.miniLabel);

            Camera cam = (target as Tonemapping).GetComponent<Camera>();
            if (cam != null) {
#if UNITY_5_6_OR_NEWER
                if (!cam.allowHDR) {
#else
                if (!cam.hdr) {
#endif
                EditorGUILayout.HelpBox("The camera is not HDR enabled. This will likely break the Tonemapper.", MessageType.Warning);
                }
                else if (!(target as Tonemapping).validRenderTextureFormat) {
                    EditorGUILayout.HelpBox("The input to Tonemapper is not in HDR. Make sure that all effects prior to this are executed in HDR.", MessageType.Warning);
                }
            }

            EditorGUILayout.PropertyField (type, new GUIContent ("Technique"));

            if (type.enumValueIndex == (int) Tonemapping.TonemapperType.UserCurve) {
                EditorGUILayout.PropertyField (remapCurve, new GUIContent ("Remap curve", "Specify the mapping of luminances yourself"));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.SimpleReinhard) {
                EditorGUILayout.PropertyField (exposureAdjustment, new GUIContent ("Exposure", "Exposure adjustment"));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.Hable) {
                EditorGUILayout.PropertyField (exposureAdjustment, new GUIContent ("Exposure", "Exposure adjustment"));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.Photographic) {
                EditorGUILayout.PropertyField (exposureAdjustment, new GUIContent ("Exposure", "Exposure adjustment"));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.OptimizedHejiDawson) {
                EditorGUILayout.PropertyField (exposureAdjustment, new GUIContent ("Exposure", "Exposure adjustment"));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.AdaptiveReinhard) {
                EditorGUILayout.PropertyField (middleGrey, new GUIContent ("Middle grey", "Middle grey defines the average luminance thus brightening or darkening the entire image."));
                EditorGUILayout.PropertyField (white, new GUIContent ("White", "Smallest luminance value that will be mapped to white"));
                EditorGUILayout.PropertyField (adaptionSpeed, new GUIContent ("Adaption Speed", "Speed modifier for the automatic adaption"));
                EditorGUILayout.PropertyField (adaptiveTextureSize, new GUIContent ("Texture size", "Defines the amount of downsamples needed."));
            } else if (type.enumValueIndex == (int) Tonemapping.TonemapperType.AdaptiveReinhardAutoWhite) {
                EditorGUILayout.PropertyField (middleGrey, new GUIContent ("Middle grey", "Middle grey defines the average luminance thus brightening or darkening the entire image."));
                EditorGUILayout.PropertyField (adaptionSpeed, new GUIContent ("Adaption Speed", "Speed modifier for the automatic adaption"));
                EditorGUILayout.PropertyField (adaptiveTextureSize, new GUIContent ("Texture size", "Defines the amount of downsamples needed."));
            }

            GUILayout.Label("All following effects will use LDR color buffers", EditorStyles.miniBoldLabel);

            serObj.ApplyModifiedProperties();
        }
    }
}