using UnityEngine;

public class FloatBobberControllerPro : MonoBehaviour
{
    [Header("Water")]
    public float waterLevel = 0f;
    public float waterDensity = 1f;

    [Header("Bobber Physical")]
    public float bobberVolume = 30f;   // 浮漂最大浮力 (cm³)
    public float bobberMass = 1f;      // 浮漂自重 (g)
    public float bobberHeight = 0.25f; // 浮漂长度，用来决定躺漂角度

    [Header("Tackle Weight")]
    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 angleLaySpeed = 2f;     // 躺漂速度
    public float uprightSpeed = 2f;      // 立漂速度
    public float bottomDrag = 1.2f;      // 铅坠触底阻力（越大越难被浮漂拉起）

    [Header("Angles")]
    public float maxLayAngle = 75f;      // 最大躺漂角度
    float currentAngle = 0f;

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

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

    void Update()
    {
        SimulateBobber();
    }

    void SimulateBobber()
    {
        float totalWeight = bobberMass + sinkerWeight + baitWeight + hookWeight;
        float netBuoyancy = bobberVolume - totalWeight;    // 正 → 上浮；负 → 下拉

        // -----------------------------
        // ① 计算浮漂底部 Y 的高度
        // -----------------------------
        float bobberBottomY = transform.position.y - bobberHeight * 0.5f;
        float bottomY = waterLevel - 0.02f;  // 水底高度（可替换真实地形）

        bool sinkerOnBottom = (bobberBottomY <= bottomY);

        // -----------------------------
        // ② 计算 targetY
        // -----------------------------
        float targetY;

        if (!sinkerOnBottom)
        {
            // 铅坠悬浮 → 浮漂直立
            if (netBuoyancy > 0)
            {
                float rise = Mathf.Clamp01(netBuoyancy / bobberVolume) * 0.1f;
                targetY = waterLevel + rise;
            }
            else
            {
                float sink = Mathf.Abs(netBuoyancy) * 0.02f;
                targetY = waterLevel - sink;
            }
        }
        else
        {
            // 铅坠触底 → 浮漂无法再被向下拉
            if (netBuoyancy > bottomDrag)
            {
                // 浮漂浮力足够将其立起来
                float rise = Mathf.Clamp01((netBuoyancy - bottomDrag) / bobberVolume) * 0.1f;
                targetY = waterLevel + rise;    // 轻轻立起
            }
            else
            {
                // 浮漂浮力不足 → 躺漂
                targetY = waterLevel + 0.01f; // 漂身贴水
            }
        }

        // 水波噪声
        targetY += Mathf.Sin(Time.time * noiseFreq) * noiseAmp;

        // 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);

        // -----------------------------
        // ④ 浮漂角度控制
        // -----------------------------
        float targetAngle = 0f;

        if (sinkerOnBottom)
        {
            // 触底 → 判断是否能立漂
            if (netBuoyancy > bottomDrag)
            {
                targetAngle = 0f; // 立漂
            }
            else
            {
                // 躺漂
                targetAngle = maxLayAngle;
            }
        }
        else
        {
            // 铅坠在水中 → 漂直立
            targetAngle = 0f;
        }

        // 平滑角度
        currentAngle = Mathf.Lerp(
            currentAngle,
            targetAngle,
            Time.deltaTime * (targetAngle == 0 ? uprightSpeed : angleLaySpeed)
        );

        transform.rotation = Quaternion.Euler(currentAngle, 0, 0);
    }

    // ----------------------------------------
    // 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;
    }
}