ashby-games/Unity/CarsDash/Assets/Scripts/AI/AICarDriver.cs

using System;
using DG.Tweening;
using Unity.VisualScripting;
using UnityEditor.Callbacks;
using UnityEngine;

public class AICarDriver : MonoBehaviour 
{

    [SerializeField] private Transform targetPositionTranform;

    private AICarController carDriver;
    private Vector3 targetPosition;

    private void Awake()
    {
        carDriver = GetComponent<AICarController>();
        impactTimer = new TimerSystem();

        // SetImpactTimer();
    }

    private TimerSystem impactTimer;
    private float forwardAmount = 0f;
    private float turnAmount = 0f;

    public void UpdateMovement(Action onComplete = null) 
    {
        // provide a roamPoint
        SetTargetPosition(targetPositionTranform.position);

        float targetDistReach = 2f;
        float distanceToTarget = Vector3.Distance(transform.position, targetPosition);

        Debug.Log($"distanceToTarget :: {distanceToTarget}");

        if (distanceToTarget > targetDistReach)
        {
            // Still too far, keep going
            Vector3 dirToMovePosition = (targetPosition - transform.position).normalized;
            float dot = Vector3.Dot(transform.forward, dirToMovePosition);

            if (dot > 0)
            {
                // Target in front
                forwardAmount = 1f;

                float stoppingDistance = 2f;
                float stoppingSpeed = 5f;

                // if (onImpact)
                // {
                    // the target location should be set to next roam point or to another enemy/player 
                    // and then DoReverse()
                //     DoReverse();
                // }
                // else if (canCheck)
                // {
                    if (distanceToTarget < stoppingDistance && carDriver.GetSpeed() > stoppingSpeed) 
                    {
                        // Within stopping distance and moving forward too fast
                        forwardAmount = -1f;
                    }
                // }

                // after impact reverse for about 0.5 seconds
            } 
            else 
            {
                // Target behind
                float reverseDistance = 25f;
                if (distanceToTarget > reverseDistance) 
                {
                    // Too far to reverse
                    forwardAmount = 1f;
                    // if (onImpact)
                    // {
                        // the target location should be set to next roam point or to another enemy/player 
                        // and then DoReverse()
                    //     DoReverse();
                    // }
                } 
                else 
                {
                    forwardAmount = -1f;
                    // Check if DoReverse can be called instead
                }
            }

            turnAmount = FindTurnAmt();
        } 
        else 
        {
            // Reached target
            Debug.Log($"Target reached: {forwardAmount}");
            if (forwardAmount == 1)
                onComplete?.Invoke();

            forwardAmount = carDriver.GetSpeed() > 15f ? -1f : 0f;
            turnAmount = 0f;
        }

        carDriver.SetInputs(forwardAmount, turnAmount);
    }

    public void DoReverse(Action onComplete)
    {
        // TODO :: Set target position before doing reverse

        Debug.Log($"CarDriverAI :: onImpact");

        if (impactTimer.IsTimerComplete)
        {
            impactTimer.Init(0.5f, onComplete: () =>
            {
                Debug.Log($"ImpactTimer :: OnTimerComplete");
                
                forwardAmount = 1f;
                turnAmount = FindTurnAmt();
                carDriver.SetInputs(forwardAmount, turnAmount);
                onComplete?.Invoke();
            });
        }

        impactTimer.UpdateTimer(Time.deltaTime);
        forwardAmount = -1f;
        turnAmount = FindTurnAmt();
        carDriver.SetInputs(forwardAmount, turnAmount);
    }

    private float FindTurnAmt()
    {
        Vector3 dirToMovePosition = (targetPosition - transform.position).normalized;
        float angleToDir = Vector3.SignedAngle(transform.forward, dirToMovePosition, Vector3.up);
        return angleToDir > 0 ? 1f : -1f;
    }

    public void SetTargetPosition(Vector3 targetPosition) 
    {
        this.targetPosition = targetPosition;
    }
}