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

/// <summary>
/// 叉车
/// </summary>
public class ForkliftController : MonoBehaviour
{
    public float moveSpeed = 1500;
    public float maxAngle = 35;
    public float angleSpeed = 50;
    public float breakMove = 1000f;
    public float boostMultiplier = 2f;   // 加速倍数（Shift 键）
    public WheelCollider leftF;
    public WheelCollider leftB;
    public WheelCollider rightF;
    public WheelCollider rightB;
    public Transform model_leftF;
    public Transform model_leftB;
    public Transform model_rightF;
    public Transform model_rightB;
    void Update()
    {
        WheelsControl_Update();
        WheelRot();
    }
    void WheelsControl_Update()
    {
        //垂直轴和水平轴
        float h = Input.GetAxisRaw("Horizontal");
        float v = Input.GetAxisRaw("Vertical");

        // 默认速度 = moveSpeed
        float currentSpeed = moveSpeed;
        //前轮角度，后轮驱动
        leftB.motorTorque = v * moveSpeed;
        rightB.motorTorque = v * moveSpeed;
        WheelsModel_Update(model_leftF, leftF);
        WheelsModel_Update(model_leftB, leftB);
        WheelsModel_Update(model_rightF, rightF);
        WheelsModel_Update(model_rightB, rightB);
        //if (Input.GetKeyDown(KeyCode.LeftShift))
        //{
        //    leftB.motorTorque += v * moveSpeed*2;
        //    rightB.motorTorque += v * moveSpeed*2;
        //}
        float targetSpeed = Input.GetKey(KeyCode.LeftShift) ? moveSpeed * boostMultiplier : moveSpeed;
        currentSpeed = Mathf.Lerp(currentSpeed, targetSpeed, Time.deltaTime * 10f); // 5f 控制平滑速度
    }
    void WheelsModel_Update(Transform t, WheelCollider wheel)
    {
        Vector3 pos = t.position;
        Quaternion rot = t.rotation;
        wheel.GetWorldPose(out pos, out rot);
        t.position = pos;
        t.rotation = rot;
    }
    void WheelRot()
    {
        //左转向
        if (Input.GetKey(KeyCode.A))
        {
            //Debug.Log(leftF.steerAngle);
            leftF.steerAngle -= Time.deltaTime * angleSpeed;
            rightF.steerAngle -= Time.deltaTime * angleSpeed;
            if (leftF.steerAngle < (0 - maxAngle) || rightF.steerAngle < (0 - maxAngle))
            {
                //到最大值后就不能继续加角度了
                leftF.steerAngle = (0 - maxAngle);
                rightF.steerAngle = (0 - maxAngle);
            }
        }
        //右转向
        if (Input.GetKey(KeyCode.D))
        {
            leftF.steerAngle += Time.deltaTime * angleSpeed;
            rightF.steerAngle += Time.deltaTime * angleSpeed;
            if (leftF.steerAngle > maxAngle || rightF.steerAngle > maxAngle)
            {
                leftF.steerAngle = maxAngle;
                rightF.steerAngle = maxAngle;
            }
        }
        //松开转向后，方向打回
        if (Input.GetKeyUp(KeyCode.A) || Input.GetKeyUp(KeyCode.D))
            leftF.steerAngle = rightF.steerAngle = 0;

        bool isBraking = Input.GetKey(KeyCode.Space);
        leftB.brakeTorque = isBraking ? breakMove : 0f;
        rightB.brakeTorque = isBraking ? breakMove : 0f;
    }
}