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

namespace UDE_HAND_INTERACTION
{
    [CustomEditor(typeof(HandStaticPose))]
    public class HandStaticPoseEditor : Editor
    {
        private HandStaticPose _handStaticPose;

        private VirtualHand virtualHand;

        private Handedness _lastHandedness;

        private const float GIZMO_SCALE = 0.007f;

        SerializedProperty _virtualHand;

        private void OnEnable()
        {
            _handStaticPose = target as HandStaticPose;
            _virtualHand = serializedObject.FindProperty("_virtualHand");
            AssignMissingGhostProvider();
        }

        private void OnDisable()
        {
            DestroyGhost();
        }


        public override void OnInspectorGUI()
        {
            base.OnInspectorGUI();
            GUILayout.Space(10);
            if (GUILayout.Button("Create Visual Pose Model"))
            {
                _handStaticPose.CreateVisualModel();
            }
            if(_handStaticPose._virtualHand != null)
            {
                EditorGUILayout.PropertyField(_virtualHand);
            }
            DrawGhostMenu(_handStaticPose.HandPose);
            serializedObject.ApplyModifiedProperties();
        }

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

            if (virtualHand == null)
            {
                return;
            }

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

            DestroyImmediate(virtualHand.gameObject);
        }

        private void DrawGhostMenu(HandPose handPose)
        {
            if (virtualHand == null || _lastHandedness != handPose.Handedness)
            {
                RegenerateGhost();
            }
            _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 (_handStaticPose.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 * _handStaticPose.HandPose.JointRotations[i];

                float scale = GIZMO_SCALE * _handStaticPose.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(_handStaticPose, "Bone Rotation");
                _handStaticPose.HandPose.JointRotations[i] = jointSet.TrackedRotation;
                anyChanged = true;
            }

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

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

        private void CreateGhost()
        {
            if (_handStaticPose._HPResource == null || PrefabUtility.IsPartOfPrefabAsset(_handStaticPose))
            {
                return;
            }
            Transform relativeTo = _handStaticPose.transform;
            VirtualHand ghostPrototype = _handStaticPose._HPResource.GetHand(_handStaticPose.HandPose.Handedness);
            virtualHand = Instantiate(ghostPrototype, relativeTo);
            virtualHand.gameObject.hideFlags = HideFlags.HideAndDontSave;
            Pose relativePose = _handStaticPose.transform.GetPose(Space.World);
            Pose pose = PoseManager.GlobalPoseScaled(relativeTo, relativePose);
            virtualHand.SetPose(_handStaticPose.HandPose, relativePose);
        }

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

            TryGetDefaultResProvider(out _handStaticPose._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;
        }
    }
}