using OctoberStudio.Easing;
using OctoberStudio.Rendering;
using OctoberStudio.VAT;
using UnityEngine;
using UnityEngine.Events;

namespace OctoberStudio
{
    public class CharacterBehavior : MonoBehaviour, ICharacterBehavior
    {
        protected static readonly int DEFEAT_TRIGGER = Animator.StringToHash("Defeat");
        protected static readonly int REVIVE_TRIGGER = Animator.StringToHash("Revive");
        protected static readonly int SPEED_FLOAT = Animator.StringToHash("Speed");

        protected static readonly int _Overlay = Shader.PropertyToID("_Overlay");

        // 把"角色逻辑事件"翻译成"VAT clip 名"。3D 模式下挂 controller 即可,2D 模式留空不影响。
        protected const string VAT_CLIP_IDLE = "Idle";
        protected const string VAT_CLIP_RUN  = "Run";
        protected const string VAT_CLIP_DIE  = "Die";
        protected const float  VAT_SPEED_THRESHOLD = 0.01f;

        [Tooltip("可选：挂载 RendererAdapter 切换 2D/3D 渲染。未挂时回退到下方 SpriteRenderer 字段。")]
        [SerializeField] protected RendererAdapter rendererAdapter;
        [SerializeField] protected SpriteRenderer playerSpriteRenderer;
        [SerializeField] protected Animator animator;
        [Tooltip("可选：3D VAT 模式下使用。SetSpeed/PlayDefeatAnimation/PlayReviveAnimation 会同步切换 VAT clip。")]
        [SerializeField] protected VATAnimationController vatAnimationController;
        [SerializeField] protected Color hitColor;
        [SerializeField] protected Transform centerTransform;
        public Transform CenterTransform => centerTransform;

        public Transform Transform => transform;

        protected IEasingCoroutine damageCoroutine;

        /// <summary>
        /// 优先用 RendererAdapter 的 Material，否则回退到 SpriteRenderer.material。
        /// </summary>
        protected virtual Material HitMaterial
        {
            get => rendererAdapter != null ? rendererAdapter.Material : playerSpriteRenderer.material;
            set
            {
                if (rendererAdapter != null) rendererAdapter.Material = value;
                else playerSpriteRenderer.material = value;
            }
        }

        protected virtual void Reset()
        {
            if (rendererAdapter == null) rendererAdapter = GetComponent<RendererAdapter>();
            if (vatAnimationController == null) vatAnimationController = GetComponentInChildren<VATAnimationController>(true);
        }

        protected virtual void Awake()
        {
            // 编辑器没拖时,运行时再尝试自动找(支持 nested prefab 中后挂上来的情况)
            if (vatAnimationController == null) vatAnimationController = GetComponentInChildren<VATAnimationController>(true);
        }

        public virtual void SetSpeed(float speed)
        {
            if (animator != null) animator.SetFloat(SPEED_FLOAT, speed);
            if (vatAnimationController != null)
            {
                vatAnimationController.Play(speed > VAT_SPEED_THRESHOLD ? VAT_CLIP_RUN : VAT_CLIP_IDLE);
            }
        }

        public virtual void SetLocalScale(Vector3 scale)
        {
            // VAT 3D 模式: PlayerBehavior 传过来的 scale.x=±1 是 2D 翻转语义,
            // 3D 模型不能用 scale.x=-1 (会翻转法线 / culling),改用 VATAnimationController.SetFacing 旋转
            if (vatAnimationController != null)
            {
                vatAnimationController.SetFacing(scale.x >= 0 ? 1 : -1);
                return;
            }
            transform.localScale = scale;
        }

        public virtual void PlayReviveAnimation()
        {
            if (animator != null) animator.SetTrigger(REVIVE_TRIGGER);
            if (vatAnimationController != null) vatAnimationController.Play(VAT_CLIP_IDLE);
        }

        public virtual void PlayDefeatAnimation()
        {
            if (animator != null) animator.SetTrigger(DEFEAT_TRIGGER);
            if (vatAnimationController != null) vatAnimationController.Play(VAT_CLIP_DIE, loop: false);
        }

        public virtual void SetSortingOrder(int order)
        {
            if (rendererAdapter != null) rendererAdapter.SortingOrder = order;
            else if (playerSpriteRenderer != null) playerSpriteRenderer.sortingOrder = order;
        }

        public virtual void FlashHit(UnityAction onFinish = null)
        {
            if (damageCoroutine.ExistsAndActive()) return;

            var transparentColor = hitColor;
            transparentColor.a = 0;

            var mat = HitMaterial;
            if (mat == null || !mat.HasProperty(_Overlay))
            {
                onFinish?.Invoke();
                return;
            }
            mat.SetColor(_Overlay, transparentColor);

            damageCoroutine = mat.DoColor(_Overlay, hitColor, 0.05f).SetOnFinish(() =>
            {
                damageCoroutine = mat.DoColor(_Overlay, transparentColor, 0.05f).SetOnFinish(onFinish);
            });
        }
    }
}