using UnityEngine;
using UnityEngine.Rendering;

namespace Vanguard.Board3D
{
    /// <summary>
    /// Карта на столе: тонкая коробка с отдельными материалами лица, рубашки
    /// и торца. Rest — поворот вокруг Y, закрытость — переворот вокруг X.
    /// </summary>
    public sealed class Card3D : MonoBehaviour
    {
        private PlaymatLayoutConfig _config;
        private MeshRenderer _front;
        private MeshRenderer _back;
        private MeshRenderer _edge;
        private MeshRenderer _highlight;
        private BoxCollider _collider;
        private MaterialPropertyBlock _block;

        private bool _faceUp = true;
        private bool _rested;
        private Quaternion _baseRotation = Quaternion.identity;
        private Quaternion _targetRotation = Quaternion.identity;
        private Vector3 _targetPosition;
        private Vector3 _targetScale = Vector3.one;
        private bool _immediate;

        private bool _dragging;
        private Vector3 _dragOriginPosition;
        private Quaternion _dragOriginRotation;

        public BoardCardRef Ref { get; private set; }
        public bool IsFaceUp => _faceUp;
        public bool IsRested => _rested;
        public bool IsDragging => _dragging;
        public Vector3 TargetPosition => _targetPosition;
        public float TargetYaw => _targetRotation.eulerAngles.y;
        public Quaternion TargetRotation => _targetRotation;

        public static Card3D Create(Transform parent, PlaymatLayoutConfig config)
        {
            var go = new GameObject("Card3D");
            go.transform.SetParent(parent, false);
            var card = go.AddComponent<Card3D>();
            card.Build(config != null ? config : PlaymatLayoutConfig.Default);
            return card;
        }

        private void Build(PlaymatLayoutConfig config)
        {
            _config = config;
            _block = new MaterialPropertyBlock();

            var width = _config.cardWidth;
            var height = _config.cardHeight;
            var thickness = _config.cardThickness;

            var edgeGo = GameObject.CreatePrimitive(PrimitiveType.Cube);
            edgeGo.name = "Edge";
            RemoveCollider(edgeGo);
            edgeGo.transform.SetParent(transform, false);
            edgeGo.transform.localScale = new Vector3(width, thickness, height);
            _edge = edgeGo.GetComponent<MeshRenderer>();
            _edge.sharedMaterial = BoardMaterials.Edge;
            BoardMaterials.SetShadows(_edge, true);

            var frontGo = new GameObject("Front");
            frontGo.transform.SetParent(transform, false);
            frontGo.transform.localPosition = new Vector3(0f, (thickness * 0.5f) + 0.0008f, 0f);
            var frontFilter = frontGo.AddComponent<MeshFilter>();
            frontFilter.sharedMesh = BoardMeshLibrary.CardFace(width, height, front: true);
            _front = frontGo.AddComponent<MeshRenderer>();
            _front.sharedMaterial = BoardMaterials.White;
            BoardMaterials.SetShadows(_front, false);

            var backGo = new GameObject("Back");
            backGo.transform.SetParent(transform, false);
            backGo.transform.localPosition = new Vector3(0f, -(thickness * 0.5f) - 0.0008f, 0f);
            var backFilter = backGo.AddComponent<MeshFilter>();
            backFilter.sharedMesh = BoardMeshLibrary.CardFace(width, height, front: false);
            _back = backGo.AddComponent<MeshRenderer>();
            _back.sharedMaterial = BoardMaterials.Back;
            BoardMaterials.SetShadows(_back, false);

            var highlightGo = new GameObject("Highlight");
            highlightGo.transform.SetParent(transform, false);
            highlightGo.transform.localPosition = new Vector3(0f, -(thickness * 0.5f) - 0.0015f, 0f);
            var filter = highlightGo.AddComponent<MeshFilter>();
            filter.sharedMesh = BoardMeshLibrary.Frame(
                width * 1.16f,
                height * 1.16f,
                Mathf.Max(0.025f, width * 0.035f));
            _highlight = highlightGo.AddComponent<MeshRenderer>();
            _highlight.sharedMaterial = BoardMaterials.Highlight;
            BoardMaterials.SetShadows(_highlight, false);
            _highlight.gameObject.SetActive(false);

            _collider = gameObject.AddComponent<BoxCollider>();
            _collider.size = new Vector3(
                width * 1.02f,
                Mathf.Max(thickness + 0.02f, 0.03f),
                height * 1.02f);
        }

        public void Bind(BoardCardRef reference)
        {
            Ref = reference;
            name = "Card3D " + reference;
        }

        public void SetArt(Texture2D texture, Color accent)
        {
            if (_front == null)
                return;

            _front.GetPropertyBlock(_block);
            _block.Clear();
            BoardMaterials.SetTexture(
                _block,
                _front.sharedMaterial,
                texture != null ? texture : BoardTextures.White);
            BoardMaterials.SetColor(
                _block,
                _front.sharedMaterial,
                texture != null ? Color.white : accent);
            _front.SetPropertyBlock(_block);
        }

        public void SetState(
            Quaternion baseRotation,
            bool faceUp,
            bool rested,
            bool damageLayout = false)
        {
            _baseRotation = baseRotation;
            _faceUp = faceUp;
            _rested = rested;

            // Атака/Rest — по часовой стрелке (+90°), урон лежит против (-90°).
            var restYaw = rested ? (damageLayout ? -90f : 90f) : 0f;
            var rest = Quaternion.Euler(0f, restYaw, 0f);
            var flip = Quaternion.Euler(faceUp ? 0f : 180f, 0f, 0f);
            _targetRotation = rest * baseRotation * flip;
        }

        public void SetPose(
            Vector3 position,
            Quaternion baseRotation,
            bool faceUp,
            bool rested,
            bool immediate,
            bool damageLayout = false)
        {
            SetState(baseRotation, faceUp, rested, damageLayout);
            _targetPosition = position;
            _targetScale = Vector3.one;
            _immediate = immediate;

            if (_dragging)
                return;

            if (immediate)
                Snap();
        }

        public void SetVisible(bool visible)
        {
            gameObject.SetActive(visible);
        }

        public void SetHighlight(Color? color)
        {
            if (_highlight == null)
                return;

            var active = color.HasValue;
            _highlight.gameObject.SetActive(active);
            if (!active)
                return;

            _highlight.GetPropertyBlock(_block);
            _block.Clear();
            BoardMaterials.SetColor(_block, _highlight.sharedMaterial, color.Value);
            _highlight.SetPropertyBlock(_block);
        }

        public void BeginDrag()
        {
            if (_dragging)
                return;

            _dragging = true;
            _dragOriginPosition = transform.position;
            _dragOriginRotation = transform.rotation;
            _targetScale = Vector3.one * 1.05f;
            if (_collider != null)
                _collider.enabled = false;
            SetHighlight(null);
        }

        public void DragTo(Vector3 worldPosition)
        {
            if (!_dragging)
                return;

            var yaw = _targetRotation.eulerAngles.y;
            transform.position = new Vector3(
                worldPosition.x,
                _config.dragLift + (_config.cardThickness * 0.5f),
                worldPosition.z);
            transform.rotation = Quaternion.Euler(0f, yaw, 0f);
            transform.localScale = Vector3.one * 1.05f;
        }

        public void DropAt(Vector3 position, Quaternion rotation)
        {
            _dragging = false;
            if (_collider != null)
                _collider.enabled = true;
            _targetPosition = position;
            _targetRotation = rotation;
            _targetScale = Vector3.one;
            _immediate = false;
        }

        public void ReturnToOrigin()
        {
            _dragging = false;
            if (_collider != null)
                _collider.enabled = true;
            _targetPosition = _dragOriginPosition;
            _targetRotation = _dragOriginRotation;
            _targetScale = Vector3.one;
            _immediate = false;
        }

        public void Snap()
        {
            transform.position = _targetPosition;
            transform.rotation = _targetRotation;
            transform.localScale = _targetScale;
            _immediate = false;
        }

        public void Tick(float deltaTime)
        {
            if (_dragging || deltaTime <= 0f)
                return;

            if (_immediate)
            {
                Snap();
                return;
            }

            var move = 1f - Mathf.Exp(-_config.smoothMoveSpeed * deltaTime);
            var rotate = 1f - Mathf.Exp(-_config.smoothRotateSpeed * deltaTime);
            transform.position = Vector3.Lerp(transform.position, _targetPosition, move);
            transform.rotation = Quaternion.Slerp(transform.rotation, _targetRotation, rotate);
            transform.localScale = Vector3.Lerp(transform.localScale, _targetScale, move);

            if (Vector3.SqrMagnitude(transform.position - _targetPosition) < 0.0000004f
                && Quaternion.Angle(transform.rotation, _targetRotation) < 0.1f)
            {
                Snap();
            }
        }

        private static void RemoveCollider(GameObject target)
        {
            var collider = target.GetComponent<Collider>();
            if (collider == null)
                return;

            if (Application.isPlaying)
                Destroy(collider);
            else
                DestroyImmediate(collider);
        }
    }
}