using System;
using System.Collections.Generic;
using DG.Tweening;
using SLSFramework.General;
using UnityEngine;

namespace Continentis.MainGame.Character
{
    /// <summary>
    /// Tier 1 动画驱动器：静态图片切换 + DOTween 位移。
    /// 不使用 AnimationClip，通过切换 SpriteRenderer.sprite 表现不同动作。
    /// 适合尚无帧动画资源的角色，或仅有立绘/静态图片的简易角色。
    /// </summary>
    public class StaticSpriteAnimator : MonoBehaviour, ICharacterAnimator
    {
        [Header("Sprite 映射")]
        [Tooltip("动作名称 → Sprite 映射表，Key 需与 CharacterData.animations 的 Key 对齐（如 Idle、Attack、Hit）")]
        public SerializableDictionary<string, Sprite> actionSprites;

        [Header("DOTween 参数")]
        [Tooltip("攻击时前冲距离")]
        [SerializeField] private float attackLungeDistance = 0.5f;

        [Tooltip("攻击前冲时长")]
        [SerializeField] private float attackLungeDuration = 0.15f;

        [Tooltip("受击抖动强度")]
        [SerializeField] private float hitShakeStrength = 0.3f;

        [Tooltip("受击抖动时长")]
        [SerializeField] private float hitShakeDuration = 0.2f;

        private SpriteRenderer _mainSpriteRenderer;
        private Sprite _idleSprite;
        private Vector3 _originalLocalPosition;
        private Tween _currentTween;

        // ── ICharacterAnimator ──────────────────────────────────────────────

        /// <summary>
        /// 初始化：缓存主 SpriteRenderer 和 Idle Sprite。
        /// </summary>
        public void InitializeAnimator(CombatCharacterViewBase view)
        {
            _mainSpriteRenderer = view.mainView.GetComponent<SpriteRenderer>();
            if (_mainSpriteRenderer == null)
                _mainSpriteRenderer = view.mainView.GetComponentInChildren<SpriteRenderer>();

            _originalLocalPosition = view.mainView.transform.localPosition;

            // 尝试从映射表获取 Idle sprite，回退为当前显示的 sprite
            _idleSprite = actionSprites != null && actionSprites.TryGetValue("Idle", out Sprite idle)
                ? idle
                : _mainSpriteRenderer != null ? _mainSpriteRenderer.sprite : null;

            // 应用 Idle Sprite
            if (_mainSpriteRenderer != null && _idleSprite != null)
                _mainSpriteRenderer.sprite = _idleSprite;
        }

        /// <summary>
        /// 播放动作：切换 Sprite + DOTween 动效，完毕后自动回 Idle。
        /// </summary>
        public void PlayAction(string actionName, float speed = 1f, Action onComplete = null)
        {
            KillCurrentTween();

            // 切换 Sprite
            if (_mainSpriteRenderer != null && actionSprites != null &&
                actionSprites.TryGetValue(actionName, out Sprite sprite))
            {
                _mainSpriteRenderer.sprite = sprite;
            }

            // 根据动作类型执行 DOTween 动效
            float adjustedDuration = 1f / Mathf.Max(speed, 0.01f);
            Transform mainTransform = _mainSpriteRenderer != null
                ? _mainSpriteRenderer.transform
                : transform;

            switch (actionName)
            {
                case "Attack":
                case "Skill":
                    PlayLungeAnimation(mainTransform, adjustedDuration, onComplete);
                    break;

                case "Hit":
                    PlayShakeAnimation(mainTransform, adjustedDuration, onComplete);
                    break;

                default:
                    // 无特殊动效，短暂延迟后回 Idle
                    float holdDuration = DefaultActionHoldDuration * adjustedDuration;
                    _currentTween = DOVirtual.DelayedCall(holdDuration, () =>
                    {
                        ReturnToIdle();
                        onComplete?.Invoke();
                    });
                    break;
            }
        }

        /// <summary>
        /// 立即切回 Idle Sprite 并复位位置。
        /// </summary>
        public void ReturnToIdle()
        {
            KillCurrentTween();

            if (_mainSpriteRenderer != null && _idleSprite != null)
                _mainSpriteRenderer.sprite = _idleSprite;

            if (_mainSpriteRenderer != null)
                _mainSpriteRenderer.transform.localPosition = _originalLocalPosition;
        }

        /// <summary>
        /// 暂停或恢复当前 Tween。
        /// </summary>
        public void SetPause(bool isPaused)
        {
            if (_currentTween != null && _currentTween.IsActive())
            {
                if (isPaused) _currentTween.Pause();
                else _currentTween.Play();
            }
        }

        // ── 内部动效 ────────────────────────────────────────────────────────

        private const float DefaultActionHoldDuration = 0.3f;

        private void PlayLungeAnimation(Transform target, float durationScale, Action onComplete)
        {
            float duration = attackLungeDuration * durationScale;
            Vector3 lungeOffset = target.right * attackLungeDistance;

            _currentTween = DOTween.Sequence()
                .Append(target.DOLocalMove(_originalLocalPosition + lungeOffset, duration).SetEase(Ease.OutQuad))
                .Append(target.DOLocalMove(_originalLocalPosition, duration).SetEase(Ease.InQuad))
                .OnComplete(() =>
                {
                    ReturnToIdle();
                    onComplete?.Invoke();
                });
        }

        private void PlayShakeAnimation(Transform target, float durationScale, Action onComplete)
        {
            float duration = hitShakeDuration * durationScale;

            _currentTween = target.DOShakePosition(duration, hitShakeStrength, vibrato: 10, randomness: 90, fadeOut: true)
                .OnComplete(() =>
                {
                    target.localPosition = _originalLocalPosition;
                    ReturnToIdle();
                    onComplete?.Invoke();
                });
        }

        private void KillCurrentTween()
        {
            if (_currentTween != null && _currentTween.IsActive())
            {
                _currentTween.Kill();
                _currentTween = null;
            }
        }

        private void OnDestroy()
        {
            KillCurrentTween();
        }
    }
}