using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace UDE_HAND_INTERACTION
{
    [CustomEditor(typeof(HandInteraction))]
    public class HandInteractionEditor : Editor
    {
        private HandInteraction _handInteraction;

        private VirtualHand virtualHand;

        public HandPerfabResource _HPResource;
        private Handedness _lastHandedness;

        private const float GIZMO_SCALE = 0.007f;

        private void Awake()
        {
            _handInteraction = target as HandInteraction;
        }

        private void OnEnable()
        {
            AssignMissingGhostProvider();
        }

        private void OnDisable()
        {
            DestroyGhost();
        }

        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();

            _handInteraction._relativeTo = _handInteraction.transform.parent;

            DrawGhostMenu(_handInteraction.HandPose);
            serializedObject.ApplyModifiedProperties();
        }

        public void OnSceneGUI()
        {
            if (SceneView.currentDrawingSceneView == null)
            {
                return;
            }

            if (virtualHand == null)
            {
                return;
            }

            EditFingers();
        }

        private void DrawGhostMenu(HandPose handPose)
        {
            HandPerfabResource resource = _handInteraction._HPResource; //EditorGUILayout.ObjectField("Ghost Provider", _HPResource, typeof(HandPerfabResource), false) as HandPerfabResource; 
            if (virtualHand == null || _HPResource != resource || _lastHandedness != handPose.Handedness)
            {
                RegenerateGhost();
            }
            _HPResource = resource;
            _lastHandedness = handPose.Handedness;
        }

        private void EditFingers()
        {
            DollHand puppet = virtualHand.GetComponent<DollHand>();
            if (puppet != null && puppet.JointSets != null)
            {
                DrawBonesRotator(puppet.JointSets);
            }
        }

        private void DrawBonesRotator(List<HandJointsSet> bones)
        {
            bool anyChanged = false;
            for (int i = 0; i < FingersData.HAND_JOINT_IDS.Length; i++)
            {
                bool changed = false;
                HandJointId joint = FingersData.HAND_JOINT_IDS[i];
                HandFinger finger = FingersData.JOINT_TO_FINGER[(int)joint];

                if (_handInteraction.HandPose.FingersFreedom[(int)finger] == JointFreedom.Free)
                {
                    continue;
                }

                HandJointsSet jointSet = bones.Find(b => b.id == joint);
                if (jointSet == null)
                {
                    continue;
                }

                Transform transform = jointSet.transform;
                transform.localRotation = jointSet.RotationOffset * _handInteraction.HandPose.JointRotations[i];

                float scale = GIZMO_SCALE * _handInteraction.transform.lossyScale.x;
                Handles.color = EditorConstants.PRIMARY_COLOR;
                Quaternion entryRotation = transform.rotation;
                Quaternion rotation = Handles.Disc(entryRotation, transform.position,
                   transform.forward, scale, false, 0);
                if (rotation != entryRotation)
                {
                    changed = true;
                }

                if (FingersData.HAND_JOINT_CAN_SPREAD[i])
                {
                    Handles.color = EditorConstants.SECONDARY_COLOR;
                    Quaternion curlRotation = rotation;
                    rotation = Handles.Disc(curlRotation, transform.position,
                        transform.up, scale, false, 0);
                    if (rotation != curlRotation)
                    {
                        changed = true;
                    }
                }

                if (!changed)
                {
                    continue;
                }

                transform.rotation = rotation;
                Undo.RecordObject(_handInteraction, "Bone Rotation");
                _handInteraction.HandPose.JointRotations[i] = jointSet.TrackedRotation;
                anyChanged = true;
            }

            if (anyChanged)
            {
                EditorUtility.SetDirty(_handInteraction);
            }
        }

        private void RegenerateGhost()
        {
            DestroyGhost();
            CreateGhost();
        }

        private void CreateGhost()
        {
            if (_HPResource == null)
            {
                return;
            }
            Transform relativeTo = _handInteraction.RelativeTo;
            VirtualHand ghostPrototype = _HPResource.GetHand(_handInteraction.HandPose.Handedness);
            if(relativeTo != null)
            {
                virtualHand = Instantiate(ghostPrototype, _handInteraction.transform);
            }
            else
            {
                virtualHand = Instantiate(ghostPrototype);
            }
            virtualHand.gameObject.hideFlags = HideFlags.HideAndDontSave;
            Pose relativePose = _handInteraction.RelativePose;
            Pose pose = PoseManager.GlobalPoseScaled(relativeTo, relativePose);
            virtualHand.SetPose(_handInteraction.HandPose, pose);
        }

        private void DestroyGhost()
        {
            if (virtualHand == null)
            {
                return;
            }

            DestroyImmediate(virtualHand.gameObject);
        }

        void AssignMissingGhostProvider()
        {
            if (_HPResource != null)
            {
                return;
            }

            TryGetDefaultResProvider(out _HPResource);
        }

        bool TryGetDefaultResProvider(out HandPerfabResource provider)
        {
            provider = null;
            HandPerfabResource[] providers = Resources.FindObjectsOfTypeAll<HandPerfabResource>();
            if (providers != null && providers.Length > 0)
            {
                provider = providers[0];
                return true;
            }

            string[] assets = AssetDatabase.FindAssets($"t:{nameof(HandPerfabResource)}");
            if (assets != null && assets.Length > 0)
            {
                string pathPath = AssetDatabase.GUIDToAssetPath(assets[0]);
                provider = AssetDatabase.LoadAssetAtPath<HandPerfabResource>(pathPath);
            }


            return provider != null;
        }

        [MenuItem("UDE Interaction/Clear All Redundant Virtual Hand")]
        static void Clear()
        {
            var VirtualHands = FindObjectsOfType<SkinnedMeshRenderer>();
            foreach (var VirtualHand in VirtualHands)
            {
                if (VirtualHand.name.Split("_")[0] == "vr" && VirtualHand.transform.parent.name.Contains("(Clone)"))
                {
                    DestroyImmediate(VirtualHand);
                }
            }
        }
    }

    public class EditorConstants
    {
        public static readonly Color PRIMARY_COLOR = new Color(0f, 1f, 1f, 0.5f);
        public static readonly Color PRIMARY_COLOR_DISABLED = new Color(0f, 1f, 1f, 0.1f);
        public static readonly Color RED_COLOR = new Color(1f, 0f, 0f, 1f);
        public static readonly Color YELLOW_COLOR = new Color(1f, 1f, 0f, 1f);

        public static readonly Color SECONDARY_COLOR = new Color(0.5f, 0.3f, 1f, 0.5f);
        public static readonly Color SECONDARY_COLOR_DISABLED = new Color(0.5f, 0.3f, 1f, 0.1f);

        public static readonly float LINE_THICKNESS = 2f;

        public static readonly float ROW_HEIGHT = 20f;
    }

    [CustomPropertyDrawer(typeof(HandPose))]
    public class HandPoseEditor : PropertyDrawer
    {
        private bool _foldedFreedom = true;
        private bool _foldedRotations = false;

        public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
        {
            float multiplier = 4;

            if (_foldedFreedom)
            {
                multiplier += Constants.NUM_FINGERS;
            }
            if (_foldedRotations)
            {
                multiplier += FingersData.HAND_JOINT_IDS.Length;
            }

            return EditorConstants.ROW_HEIGHT * multiplier;
        }

        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            EditorGUI.BeginProperty(position, label, property);
            Rect labelPos = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);
            EditorGUI.indentLevel++;

            Rect rowRect = new Rect(position.x, labelPos.y + EditorConstants.ROW_HEIGHT, position.width, EditorConstants.ROW_HEIGHT);
            DrawFlagProperty<Handedness>(property, rowRect, "Handedness:", "_handedness", false);
            rowRect.y += EditorConstants.ROW_HEIGHT;
            rowRect = DrawFingersFreedomMenu(property, rowRect);
            rowRect = DrawJointAngles(property, rowRect);
            EditorGUI.indentLevel--;
            EditorGUI.EndProperty();

        }

        private Rect DrawFingersFreedomMenu(SerializedProperty property, Rect position)
        {
            _foldedFreedom = EditorGUI.Foldout(position, _foldedFreedom, "Fingers Freedom", true);
            position.y += EditorConstants.ROW_HEIGHT;
            if (_foldedFreedom)
            {
                SerializedProperty fingersFreedom = property.FindPropertyRelative("_fingersFreedom");
                EditorGUI.indentLevel++;
                for (int i = 0; i < Constants.NUM_FINGERS; i++)
                {
                    SerializedProperty finger = fingersFreedom.GetArrayElementAtIndex(i);
                    HandFinger fingerID = (HandFinger)i;
                    JointFreedom current = (JointFreedom)finger.intValue;
                    JointFreedom selected = (JointFreedom)EditorGUI.EnumPopup(position, $"{fingerID}", current);
                    finger.intValue = (int)selected;
                    position.y += EditorConstants.ROW_HEIGHT;
                }
                EditorGUI.indentLevel--;
            }
            return position;
        }

        private Rect DrawJointAngles(SerializedProperty property, Rect position)
        {
            _foldedRotations = EditorGUI.Foldout(position, _foldedRotations, "Joint Angles", true);
            position.y += EditorConstants.ROW_HEIGHT;
            if (_foldedRotations)
            {
                SerializedProperty jointRotations = property.FindPropertyRelative("_jointRotations");
                EditorGUI.indentLevel++;
                for (int i = 0; i < FingersData.HAND_JOINT_IDS.Length; i++)
                {
                    SerializedProperty finger = jointRotations.GetArrayElementAtIndex(i);
                    HandJointId jointID = FingersData.HAND_JOINT_IDS[i];
                    Vector3 current = finger.quaternionValue.eulerAngles;
                    Vector3 rotation = EditorGUI.Vector3Field(position, $"{jointID}", current);
                    finger.quaternionValue = Quaternion.Euler(rotation);
                    position.y += EditorConstants.ROW_HEIGHT;
                }
                EditorGUI.indentLevel--;
            }

            return position;
        }

        private void DrawFlagProperty<TEnum>(SerializedProperty parentProperty, Rect position, string title, string fieldName, bool isFlags) where TEnum : Enum
        {
            SerializedProperty fieldProperty = parentProperty.FindPropertyRelative(fieldName);
            TEnum value = (TEnum)Enum.ToObject(typeof(TEnum), fieldProperty.intValue);
            Enum selectedValue = isFlags ?
                EditorGUI.EnumFlagsField(position, title, value)
                : EditorGUI.EnumPopup(position, title, value);
            fieldProperty.intValue = (int)Enum.ToObject(typeof(TEnum), selectedValue);
        }
    }
}