using System;
using UnityEditor.AnimatedValues;
using UnityEditor.IMGUI.Controls;
using UnityEngine;
using UnityEngine.Experimental.Rendering.HDPipeline;
using Object = UnityEngine.Object;

namespace UnityEditor.Experimental.Rendering.HDPipeline
{
    using _ = CoreEditorUtils;
    using CED = CoreEditorDrawer<ProxyVolumeUI, SerializedProxyVolume>;

    class ProxyVolumeUI : BaseUI<SerializedProxyVolume>
    {
        internal static Color k_GizmoThemeColorProjection = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
        internal static Color k_GizmoThemeColorProjectionFace = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
        internal static Color k_GizmoThemeColorDisabled = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
        internal static Color k_GizmoThemeColorDisabledFace = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);

        static readonly int k_ShapeCount = Enum.GetValues(typeof(InfluenceShape)).Length;

        public static readonly CED.IDrawer SectionShape;

        public static readonly CED.IDrawer SectionShapeBox = CED.Action(Drawer_SectionShapeBox);
        public static readonly CED.IDrawer SectionShapeSphere = CED.Action(Drawer_SectionShapeSphere);

        static ProxyVolumeUI()
        {
            SectionShape = CED.Group(
                    CED.Action(Drawer_FieldShapeType),
                    CED.FadeGroup(
                        (s, d, o, i) => s.IsSectionExpanded_Shape((InfluenceShape)i),
                        FadeOption.Indent,
                        SectionShapeBox,
                        SectionShapeSphere
                        )
                    );
        }

        public BoxBoundsHandle boxProjectionHandle = new BoxBoundsHandle();
        public SphereBoundsHandle sphereProjectionHandle = new SphereBoundsHandle();

        public ProxyVolumeUI()
            : base(k_ShapeCount)
        {
        }

        public override void Update()
        {
            base.Update();
            if (data != null)
                SetIsSectionExpanded_Shape((InfluenceShape)data.shape.intValue);
        }

        void SetIsSectionExpanded_Shape(InfluenceShape shape)
        {
            for (var i = 0; i < k_ShapeCount; i++)
                m_AnimBools[i].target = (int)shape == i;
        }

        public AnimBool IsSectionExpanded_Shape(InfluenceShape shapeType)
        {
            return m_AnimBools[(int)shapeType];
        }

        static void Drawer_FieldShapeType(ProxyVolumeUI s, SerializedProxyVolume d, Editor o)
        {
            EditorGUILayout.PropertyField(d.shape, _.GetContent("Shape Type"));
        }

        static void Drawer_SectionShapeBox(ProxyVolumeUI s, SerializedProxyVolume d, Editor o)
        {
            EditorGUILayout.PropertyField(d.boxSize, _.GetContent("Box Size"));
        }

        static void Drawer_SectionShapeSphere(ProxyVolumeUI s, SerializedProxyVolume d, Editor o)
        {
            EditorGUILayout.PropertyField(d.sphereRadius, _.GetContent("Sphere Radius"));
        }

        public static void DrawHandles_EditBase(Transform transform, ProxyVolume proxyVolume, ProxyVolumeUI ui, Object sourceAsset)
        {
            switch (proxyVolume.shape)
            {
                case ProxyShape.Box:
                    Handles_EditBase_Box(transform, proxyVolume, ui, sourceAsset);
                    break;
                case ProxyShape.Sphere:
                    Handles_EditBase_Sphere(transform, proxyVolume, ui, sourceAsset);
                    break;
            }
        }

        public static void DrawHandles_EditNone(Transform transform, ProxyVolume proxyVolume, ProxyVolumeUI ui, Object sourceAsset)
        {
        }

        static void Handles_EditBase_Sphere(Transform transform, ProxyVolume proxyVolume, ProxyVolumeUI s, Object sourceAsset)
        {
            s.sphereProjectionHandle.center = Vector3.zero;
            s.sphereProjectionHandle.radius = proxyVolume.sphereRadius;

            var mat = Handles.matrix;
            Handles.matrix = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one); 
            Handles.color = k_GizmoThemeColorProjection;
            EditorGUI.BeginChangeCheck();
            s.sphereProjectionHandle.DrawHandle();
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(sourceAsset, "Modified Projection Volume");

                proxyVolume.sphereRadius = s.sphereProjectionHandle.radius;

                EditorUtility.SetDirty(sourceAsset);
            }
            Handles.matrix = mat;
        }

        static void Handles_EditBase_Box(Transform transform, ProxyVolume proxyVolume, ProxyVolumeUI s, Object sourceAsset)
        {
            s.boxProjectionHandle.center = Vector3.zero;
            s.boxProjectionHandle.size = proxyVolume.boxSize;

            var mat = Handles.matrix;
            Handles.matrix = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one);

            Handles.color = k_GizmoThemeColorProjection;
            EditorGUI.BeginChangeCheck();
            s.boxProjectionHandle.DrawHandle();
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(sourceAsset, "Modified Projection Volume AABB");

                proxyVolume.boxSize = s.boxProjectionHandle.size;

                EditorUtility.SetDirty(sourceAsset);
            }

            Handles.matrix = mat;
        }

        public static void DrawGizmos_EditNone(Transform transform, ProxyVolume proxyVolume, ProxyVolumeUI ui, Object sourceAsset)
        {
            switch (proxyVolume.shape)
            {
                case ProxyShape.Box:
                    Gizmos_EditNone_Box(transform, proxyVolume, ui, sourceAsset);
                    break;
                case ProxyShape.Sphere:
                    Gizmos_EditNone_Sphere(transform, proxyVolume, ui, sourceAsset);
                    break;
            }
        }

        static void Gizmos_EditNone_Sphere(Transform t, ProxyVolume d, ProxyVolumeUI s, Object o)
        {
            var mat = Gizmos.matrix;
            Gizmos.matrix = Matrix4x4.TRS(t.position, t.rotation, Vector3.one);

            Gizmos.color = k_GizmoThemeColorProjection;
            Gizmos.DrawWireSphere(Vector3.zero, d.sphereRadius);

            Gizmos.matrix = mat;
        }

        static void Gizmos_EditNone_Box(Transform t, ProxyVolume d, ProxyVolumeUI s, Object o)
        {
            var mat = Gizmos.matrix;
            Gizmos.matrix = Matrix4x4.TRS(t.position, t.rotation, Vector3.one);

            Gizmos.color = k_GizmoThemeColorProjection;
            Gizmos.DrawWireCube(Vector3.zero, d.boxSize);

            Gizmos.matrix = mat;
        }
    }
}