using System;
using UnityEngine;

/// <summary>
/// 起飞炮台（TurretData 子类）：
/// 平时是一门正常炮台（照常手动瞄准开火/自动开火/锁定瞄准）；
/// 额外支持起飞模式：轻点空白处 → 炮台飞到该点（点到哪飞到哪）→ 到达后持续向上发射子弹，
/// upFireDuration 到时自动降落回原位恢复正常开火；起飞时播放特殊 spine 动画
/// （takeoffAnim 播一次，flyLoopAnim 循环衔接）。
/// 交互判定在 GameMainPanel_FishBase.HandleInput（轻点=按下短+几乎没移动；按住扫射不触发起飞）。
/// 挂在 XJMH 座位炮台（xjmhTurretList 中的子对象）上即可，无需改预制体结构。
/// 注意：不要在本类定义 Awake/OnEnable，会隐藏基类的同名私有初始化逻辑。
/// </summary>
public class FlyTurretData : TurretData
{
    [Header("起飞（点哪飞哪）")]
    [Tooltip("起飞特殊 spine 动画名（起飞时播一次；为空则直接播飞行循环动画）")]
    public string takeoffAnim;
    [Tooltip("飞行/悬停循环 spine 动画名（为空则起飞动画播完后循环自身）")]
    public string flyLoopAnim;
    [Tooltip("飞行到目标点的时长(秒)")]
    public float flyDuration = 0.6f;
    [Tooltip("飞行插值：0=匀速 1=平滑缓入缓出")]
    [Range(0f, 1f)]
    public float flySmooth = 1f;
    [Tooltip("目标点距画布边缘的最小内边距(画布本地单位)，防止炮台飞出屏幕")]
    public float edgePadding = 60f;

    [Header("向上发射子弹")]
    [Tooltip("向上开火间隔(秒)")]
    public float upFireInterval = 0.4f;
    [Tooltip("向上开火总时长(秒)，<=0 表示一直开火（手动点击别处可改变目标）")]
    public float upFireDuration = 0f;
    [Tooltip("到达目标点后延迟多久开始向上开火(秒)，通常等起飞动画收尾")]
    public float upFireDelay = 0f;

    /// <summary>向上开火回调：由 GameMainPanel_FishBase 注入（走服务端同步链路 SyncFire）</summary>
    [NonSerialized] public Action onUpwardFire;

    /// <summary>是否处于飞行/悬停状态（含飞回降落途中）</summary>
    public bool IsFlying { get; private set; }

    private RectTransform _rect;
    private RectTransform _parentRect;
    private RectTransform _canvasRect;
    private Camera _uiCam;

    private Vector2 _originAnchoredPos;   // 首次起飞前的原位（降落飞回这里）
    private Vector2 _flyFrom;
    private Vector2 _flyTo;
    private float _flyTimer;
    private bool _returning;              // true=正在飞回原位降落

    private float _fireDelayTimer;
    private float _fireTimer;
    private float _fireTotalTimer;
    private bool _firing;

    /// <summary>懒加载引用（不用 Awake，避免隐藏基类私有 Awake）</summary>
    private void EnsureRefs()
    {
        if (_rect != null) return;

        _rect = GetComponent<RectTransform>();
        _parentRect = transform.parent as RectTransform;

        Canvas canvas = null;
        if (UIManager.Instance != null && UIManager.Instance.uiRoot != null)
            canvas = UIManager.Instance.uiRoot.GetComponent<Canvas>();
        if (canvas != null)
        {
            _canvasRect = canvas.GetComponent<RectTransform>();
            if (canvas.renderMode != RenderMode.ScreenSpaceOverlay)
                _uiCam = canvas.worldCamera;
        }
    }

    private void Update()
    {
        if (!IsFlying) return;

        UpdateFly();
        UpdateUpFire();
    }

    /// <summary>
    /// 起飞/移动到目标屏幕点（点到哪飞到哪）。
    /// 首次调用=起飞；飞行中再次调用=改目标点；降落中调用=取消降落改飞新目标。
    /// 返回 false 表示未起飞（节点不是 UGUI 或画布引用缺失）。
    /// </summary>
    public bool TakeoffToScreenPos(Vector2 screenPos)
    {
        EnsureRefs();
        if (_rect == null || _parentRect == null || _canvasRect == null) return false;

        if (!IsFlying)
        {
            _originAnchoredPos = _rect.anchoredPosition;
            IsFlying = true;
            PlayTakeoffAnim();
            PointUp();
        }

        _returning = false;
        _flyFrom = _rect.anchoredPosition;
        _flyTo = ScreenPosToAnchoredPos(screenPos);
        _flyTimer = 0f;

        // 改目标瞬间先停火，到达新目标后按延迟恢复
        _firing = false;
        _fireDelayTimer = 0f;
        return true;
    }

    /// <summary>降落：停火并飞回起飞前的原位</summary>
    public void Land()
    {
        if (!IsFlying || _returning) return;

        _firing = false;
        _returning = true;
        _flyFrom = _rect.anchoredPosition;
        _flyTo = _originAnchoredPos;
        _flyTimer = 0f;
    }

    // ==================== 内部逻辑 ====================

    private void UpdateFly()
    {
        _flyTimer += Time.deltaTime;
        float t = flyDuration > 0f ? Mathf.Clamp01(_flyTimer / flyDuration) : 1f;
        if (flySmooth > 0f)
            t = Mathf.Lerp(t, t * t * (3f - 2f * t), flySmooth);

        _rect.anchoredPosition = Vector2.LerpUnclamped(_flyFrom, _flyTo, t);

        if (_flyTimer < flyDuration) return;

        _rect.anchoredPosition = _flyTo;
        if (_returning)
        {
            // 落地：恢复待机动画，退出飞行状态
            IsFlying = false;
            _returning = false;
            RestoreIdleAnim();
        }
        else
        {
            StartUpFire();
        }
    }

    private void StartUpFire()
    {
        _firing = true;
        _fireDelayTimer = upFireDelay;
        _fireTimer = upFireInterval; // 延迟结束后立即打第一发
        _fireTotalTimer = 0f;
    }

    private void UpdateUpFire()
    {
        if (!_firing) return;

        // 到达后延迟（等起飞动画收尾）
        if (_fireDelayTimer > 0f)
        {
            _fireDelayTimer -= Time.deltaTime;
            return;
        }

        // 总时长限制（<=0 = 一直开火）
        if (upFireDuration > 0f)
        {
            _fireTotalTimer += Time.deltaTime;
            if (_fireTotalTimer >= upFireDuration)
            {
                Land();
                return;
            }
        }

        _fireTimer += Time.deltaTime;
        if (_fireTimer < upFireInterval) return;
        _fireTimer = 0f;

        onUpwardFire?.Invoke();
    }

    /// <summary>屏幕坐标 → 炮台父节点下的 anchoredPosition（限制在画布范围内）</summary>
    private Vector2 ScreenPosToAnchoredPos(Vector2 screenPos)
    {
        // 屏幕坐标 → 画布根节点本地坐标（相机解析模式与扇形切换一致）
        RectTransformUtility.ScreenPointToLocalPointInRectangle(
            _canvasRect, screenPos, _uiCam, out Vector2 canvasLocal);

        // 限制在画布内（留边距），防止炮台飞出屏幕
        Rect r = _canvasRect.rect;
        float xMin = r.xMin + edgePadding;
        float xMax = r.xMax - edgePadding;
        float yMin = r.yMin + edgePadding;
        float yMax = r.yMax - edgePadding;
        if (xMax < xMin) { xMin = xMax = r.center.x; }
        if (yMax < yMin) { yMin = yMax = r.center.y; }
        canvasLocal = new Vector2(
            Mathf.Clamp(canvasLocal.x, xMin, xMax),
            Mathf.Clamp(canvasLocal.y, yMin, yMax));

        // 画布本地 → 世界 → 用“世界增量”换算成父节点下的 anchoredPosition。
        // 增量法兼容父节点的翻转/旋转/缩放（上方座位 180° 翻转也能正确落点），
        // 且不依赖炮台自身的锚点设置。
        Vector3 targetWorld = _canvasRect.TransformPoint(canvasLocal);
        Vector3 deltaLocal = _parentRect.InverseTransformVector(targetWorld - _rect.position);
        return _rect.anchoredPosition + (Vector2)deltaLocal;
    }

    /// <summary>炮口固定朝上：SetRotation 的 angle 约定 0=正上方（aim-90）</summary>
    private void PointUp()
    {
        if (setPosData != null)
        {
            setPosData.SetRotation(0f);
            return;
        }

        Transform pivot = tra_RotationPivot != null ? tra_RotationPivot : transform.parent;
        if (pivot != null)
            pivot.rotation = Quaternion.Euler(0f, 0f, 0f);
    }

    /// <summary>起飞动画：takeoffAnim 播一次，flyLoopAnim 循环衔接（为空则循环自身兜底）</summary>
    private void PlayTakeoffAnim()
    {
        if (skeletonAnimation == null || skeletonAnimation.AnimationState == null) return;

        if (!string.IsNullOrEmpty(takeoffAnim))
        {
            skeletonAnimation.AnimationState.SetAnimation(0, takeoffAnim, false);
            if (!string.IsNullOrEmpty(flyLoopAnim))
                skeletonAnimation.AnimationState.AddAnimation(0, flyLoopAnim, true, 0f);
            else
                skeletonAnimation.AnimationState.AddAnimation(0, takeoffAnim, true, 0f);
        }
        else if (!string.IsNullOrEmpty(flyLoopAnim))
        {
            skeletonAnimation.AnimationState.SetAnimation(0, flyLoopAnim, true);
        }
    }

    /// <summary>落地后恢复待机动画（先 None 再 Idle，避免 currState 相同被基类短路）</summary>
    private void RestoreIdleAnim()
    {
        base.ChangeState(TurretState.None);
        base.ChangeState(TurretState.Idle);
    }

    public override void ChangeState(TurretState newState)
    {
        // 飞行/悬停期间拦截状态动画（Attack/Idle 切换不打断起飞动画）
        if (IsFlying) return;

        base.ChangeState(newState);
    }

    private void OnDisable()
    {
        // 切炮台/座位被禁用时兜底复位（基类无 OnDisable，不会冲突）
        if (!IsFlying) return;

        IsFlying = false;
        _returning = false;
        _firing = false;
        if (_rect != null)
            _rect.anchoredPosition = _originAnchoredPos;
    }
}