Fishing2/Assets/Scripts/Fishing/New/View/FishingLine/FishingLineSolver.cs

using System;
using System.Collections.Generic;
using System.Text;
using UnityEngine;

namespace NBF
{
    public enum LineType
    {
        Hand,
        HandDouble,
        Spinning,
        SpinningFloat,
    }

    public class FishingLineSolver : FGearBase
    {
        [SerializeField] public LineType LineType;


        [Header("References")] [SerializeField]
        private Transform anchorTransform;

        [SerializeField] private FishingLineNode[] logicalNodes = Array.Empty<FishingLineNode>();

        public JointPinchController PinchController;

        private void FixedUpdate()
        {
            UpdateAnchorNode();
            CalculateLineRealLength(Time.fixedDeltaTime);
        }

        #region Start Node

        private void ConfigureStartNode()
        {
            if (logicalNodes == null || logicalNodes.Length == 0 || logicalNodes[0] == null)
            {
                return;
            }

            var startNode = logicalNodes[0];
            startNode.Type = FishingLineNode.NodeType.Start;

            if (startNode.Body != null)
            {
                startNode.Body.isKinematic = true;
                startNode.Body.interpolation = RigidbodyInterpolation.Interpolate;
                startNode.Body.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
            }

            UpdateAnchorNode();
        }

        private void UpdateAnchorNode()
        {
            if (anchorTransform == null || logicalNodes == null || logicalNodes.Length == 0 || logicalNodes[0] == null)
            {
                return;
            }

            var startNode = logicalNodes[0];
            startNode.transform.SetPositionAndRotation(anchorTransform.position, anchorTransform.rotation);

            if (startNode.Body != null)
            {
                if (!startNode.Body.isKinematic)
                {
                    startNode.Body.linearVelocity = Vector3.zero;
                    startNode.Body.angularVelocity = Vector3.zero;
                }
            }
        }

        #endregion

        #region Line

        /// <summary>
        /// 当前逻辑链总长度超出配置总长度的部分，小于等于零时记为 0。
        /// </summary>
        public float CurrentStretchLength { get; private set; }

        /// <summary>
        /// 设置指定逻辑段的配置长度。
        /// segmentIndex 为 0 时表示第一段；大于 0 时表示对应逻辑节点到下一个逻辑节点的线长。
        /// </summary>
        public void SetLenght(float length, int segmentIndex = 0)
        {
            ConfigureStartNode();
            CalculateLineRealLength(0f);
        }

        private void CalculateLineRealLength(float deltaTime)
        {
        }

        #endregion

        #region LineNode

        /// <summary>
        /// 当前配置的逻辑节点只读列表。
        /// 外部可读取节点顺序，但不应直接修改数组内容。
        /// </summary>
        public IReadOnlyList<FishingLineNode> LogicalNodes => logicalNodes;

        /// <summary>
        /// 根据类型获取逻辑节点类型
        /// </summary>
        /// <param name="nodeType"></param>
        /// <returns></returns>
        public FishingLineNode GetLogicalNode(FishingLineNode.NodeType nodeType)
        {
            foreach (var fishingLineNode in logicalNodes)
            {
                if (fishingLineNode.Type == nodeType)
                {
                    return fishingLineNode;
                }
            }

            return null;
        }

        /// <summary>
        /// 获取指定顺序索引的逻辑节点。
        /// 索引基于 logicalNodes 配置顺序；超出范围或节点为空时返回 null。
        /// </summary>
        public FishingLineNode GetLogicalNode(int logicalIndex)
        {
            if (logicalNodes == null || logicalIndex < 0 || logicalIndex >= logicalNodes.Length)
            {
                return null;
            }

            return logicalNodes[logicalIndex];
        }

        /// <summary>
        /// 获取当前起点逻辑节点。
        /// 会返回配置顺序中第一个非空节点。
        /// </summary>
        public FishingLineNode GetStartNode()
        {
            return FindFirstValidLogicalNode();
        }

        /// <summary>
        /// 获取当前终点逻辑节点。
        /// 会返回配置顺序中最后一个非空节点。
        /// </summary>
        public FishingLineNode GetEndNode()
        {
            return FindLastValidLogicalNode();
        }

        private FishingLineNode FindFirstValidLogicalNode()
        {
            if (logicalNodes == null)
            {
                return null;
            }

            for (var i = 0; i < logicalNodes.Length; i++)
            {
                if (logicalNodes[i] != null)
                {
                    return logicalNodes[i];
                }
            }

            return null;
        }

        private FishingLineNode FindLastValidLogicalNode()
        {
            if (logicalNodes == null)
            {
                return null;
            }

            for (var i = logicalNodes.Length - 1; i >= 0; i--)
            {
                if (logicalNodes[i] != null)
                {
                    return logicalNodes[i];
                }
            }

            return null;
        }

        #endregion

        #region 极限判定

        [Header("Limit Detection")]
        [Min(0f)]
        // 极限判定的长度容差，允许链路在总长或单段长度上存在少量误差。
        [SerializeField]
        private float lengthLimitTolerance = 0.01f;

        [Min(0f)]
        // 达到极限后，只有当前超长值大于该阈值时，才开始进入断线候选计时。
        [SerializeField]
        private float breakStretchThreshold = 0.05f;

        /// <summary>
        /// 当鱼线达到断线条件时发出的一次性消息。
        /// 外部可订阅该事件，在回调中执行切线、播放表现或状态切换。
        /// </summary>
        public event Action<FishingLineSolver> OnLineBreakRequested;

        /// <summary>
        /// 当前断线候选状态的累计时间。
        /// 只有在处于极限状态，且 CurrentStretchLength 大于断线阈值时才会累加；否则重置为 0。
        /// </summary>
        public float LimitStateTime { get; private set; }

        /// <summary>
        /// 当前拉力极限百分比。
        /// 当超长值小于等于 lengthLimitTolerance 时为 0；
        /// 当超长值大于等于 breakStretchThreshold 时为 100；
        /// 中间区间按线性比例映射，供 UI 显示使用。
        /// </summary>
        public float CurrentBreakStretchPercent => EvaluateBreakStretchPercent(CurrentStretchLength);


        private float EvaluateBreakStretchPercent(float stretchLength)
        {
            if (stretchLength <= lengthLimitTolerance)
            {
                return 0f;
            }

            if (stretchLength >= breakStretchThreshold)
            {
                return 100f;
            }

            if (breakStretchThreshold <= lengthLimitTolerance)
            {
                return 100f;
            }

            return Mathf.InverseLerp(lengthLimitTolerance, breakStretchThreshold, stretchLength) * 100f;
        }

        #endregion

        protected override void OnInit()
        {
            var tipRb = Rod.Asset.LineConnectorRigidbody;
            anchorTransform = tipRb.transform;
        }
    }
}