using UnityEngine;
using System.Linq;

/// <summary>
/// 角色验收场景：对带 Animator 且含 int 参数 Motion 的单位轮播 Idle/Walk/Attack。
/// Edit Mode（Scene 视图）与 Play Mode 均可预览。
/// </summary>
[DisallowMultipleComponent]
[ExecuteAlways]
public sealed class CharacterReviewAnimCycle : MonoBehaviour
{
    [SerializeField] float secondsPerMotion = 2.8f;
    [SerializeField] string motionParam = "Motion";
    [SerializeField] string[] motionNames = { "Idle", "Walk", "Attack" };
    [SerializeField] int fixedMotion = -1;

    Animator _animator;
    TextMesh _label;
    string _baseLabel;
    int _motionIndex;
    float _elapsed;
    double _lastEditorTime = -1;

    void OnEnable()
    {
        CacheRefs();
        _elapsed = 0f;
        _motionIndex = 0;
        ApplyMotion(fixedMotion >= 0 ? fixedMotion : 0);
#if UNITY_EDITOR
        if (!Application.isPlaying)
        {
            _lastEditorTime = UnityEditor.EditorApplication.timeSinceStartup;
            UnityEditor.EditorApplication.update -= EditorTick;
            UnityEditor.EditorApplication.update += EditorTick;
        }
#endif
    }

    void OnDisable()
    {
#if UNITY_EDITOR
        UnityEditor.EditorApplication.update -= EditorTick;
#endif
    }

    void Update()
    {
        if (!Application.isPlaying) return;
        Tick(Time.deltaTime);
        UpdateStateLabel();
    }

#if UNITY_EDITOR
    void EditorTick()
    {
        if (this == null || Application.isPlaying || !isActiveAndEnabled) return;
        double now = UnityEditor.EditorApplication.timeSinceStartup;
        float dt = _lastEditorTime < 0 ? 0.016f : (float)(now - _lastEditorTime);
        _lastEditorTime = now;
        if (dt <= 0f) return;
        if (dt > 0.1f) dt = 0.033f;
        Tick(dt);
        if (_animator != null && _animator.isActiveAndEnabled)
            _animator.Update(dt);
        UpdateStateLabel();
        UnityEditor.SceneView.RepaintAll();
    }
#endif

    void CacheRefs()
    {
        if (_animator == null)
            _animator = GetComponentInChildren<Animator>(true);
        if (_label == null)
        {
            var labelTf = transform.Find("NameLabel");
            if (labelTf != null) _label = labelTf.GetComponent<TextMesh>();
        }
        if (_label != null && string.IsNullOrEmpty(_baseLabel))
        {
            var t = _label.text ?? "";
            var cut = t.IndexOf(" [", System.StringComparison.Ordinal);
            _baseLabel = cut >= 0 ? t.Substring(0, cut) : t;
        }
    }

    void Tick(float dt)
    {
        CacheRefs();
        if (_animator == null || _animator.runtimeAnimatorController == null) return;
        if (!HasMotionParam()) return;

        _elapsed += dt;
        if (_elapsed < Mathf.Max(0.5f, secondsPerMotion)) return;
        _elapsed = 0f;
        int count = motionNames != null && motionNames.Length > 0 ? motionNames.Length : 3;
        _motionIndex = fixedMotion >= 0 ? fixedMotion : (_motionIndex + 1) % count;
        ApplyMotion(_motionIndex);
    }

    bool HasMotionParam()
    {
        if (_animator == null) return false;
        foreach (var p in _animator.parameters)
            if (p.name == motionParam && p.type == AnimatorControllerParameterType.Int)
                return true;
        return false;
    }

    void ApplyMotion(int index)
    {
        if (_animator == null) return;
        string selected = motionNames != null && index >= 0 && index < motionNames.Length
            ? motionNames[index] : index.ToString();
        bool attackTrigger = _animator.parameters.Any(p=>p.name=="Attack" && p.type==AnimatorControllerParameterType.Trigger);
        int value = selected == "Walk" ? 1 : selected == "Attack" && !attackTrigger ? 2 : 0;
        if (HasMotionParam())
            _animator.SetInteger(motionParam, value);
        if(selected=="Attack" && attackTrigger) _animator.SetTrigger("Attack");
        if (_label != null)
        {
            string name = motionNames != null && index >= 0 && index < motionNames.Length
                ? motionNames[index]
                : index.ToString();
            _label.text = string.IsNullOrEmpty(_baseLabel)
                ? name
                : _baseLabel + " [" + name + "]";
        }
    }

    void UpdateStateLabel()
    {
        if(_animator==null || _label==null || _animator.runtimeAnimatorController==null) return;
        var state=_animator.GetCurrentAnimatorStateInfo(0);
        string name=state.IsName("Attack") ? "Attack" : state.IsName("Walk") ? "Walk" : "Idle";
        _label.text=_baseLabel+" ["+name+"]";
    }
}