using UnityEngine;

public class FloatBobberController : MonoBehaviour
{
    [SerializeField] private Rigidbody _rigidbody;
    [Header("水属性")] public float waterLevel = 0f;

    [Header("浮漂最大浮力")] public float bobberVolume = 30f; // 浮漂最大浮力 (cm³)

    public float bobberHeight = 0.25f; // 浮漂长度，用来决定躺漂角度

    [Header("配件重量")] public float sinkerWeight = 2f;
    public float baitWeight = 0.5f;
    public float hookWeight = 0.2f;

    [Header("Behaviour")] public float fallSpeed = 8f;
    public float riseSpeed = 3f;
    // public float smoothDamping = 8f; // 插值平滑

    [Header("Noise")] public float noiseAmp = 0.015f;
    public float noiseFreq = 1.5f;

    float impulseForce = 0f;
    float impulseDecay = 4f;

    void FixedUpdate()
    {
        SimulateBobber();
    }

    void SimulateBobber()
    {
        if (!_rigidbody.isKinematic) return;
        float totalDownwardWeight = sinkerWeight + baitWeight + hookWeight;

        float maxBuoyancy = bobberVolume; // 最大浮力 = 体积
        float netBuoyancy = maxBuoyancy - totalDownwardWeight;

        float targetY;

        // -------------------------
        // 1. 判断浮漂应该沉多少（吃水深度）
        // -------------------------
        if (netBuoyancy > 0)
        {
            float buoyPercent = Mathf.Clamp01(netBuoyancy / maxBuoyancy);
            float rise = buoyPercent * 0.1f; // 浮漂露出水面的高度

            targetY = waterLevel + rise;
        }
        else
        {
            // 净浮力为负 → 说明浮漂整体被拉下，沉入水中
            float sinkDistance = Mathf.Abs(netBuoyancy) * 0.03f;
            targetY = waterLevel - sinkDistance;
        }

        targetY += Mathf.Sin(Time.time * noiseFreq) * noiseAmp; // 微扰模拟波浪

        // 顿口/顶漂力
        if (impulseForce != 0f)
        {
            targetY += impulseForce * Time.deltaTime;
            impulseForce = Mathf.Lerp(impulseForce, 0, Time.deltaTime * impulseDecay);
        }

        // -----------------------------
        // ③ 上浮 / 下沉差速
        // -----------------------------
        float y = transform.position.y;
        float diff = targetY - y;

        if (diff > 0) // 上浮
            y += diff * Time.deltaTime * riseSpeed;
        else
            y += diff * Time.deltaTime * fallSpeed;

        transform.position = new Vector3(transform.position.x, y, transform.position.z);
    }


    // ----------------------------------------
    // 外部控制接口
    // ----------------------------------------

    public void TriggerDownPulse(float s = 0.8f)
    {
        impulseForce -= Mathf.Abs(s);
    }

    public void TriggerUpPulse(float s = 0.8f)
    {
        impulseForce += Mathf.Abs(s);
    }

    public void AddFishPull(float v)
    {
        sinkerWeight += v;
    }

    public void ReleaseFishPull(float v)
    {
        sinkerWeight -= v;
    }
}