ashby-games/Unity/CarsDash/Assets/Scripts/Gameplay/Car/PlayerCarController.cs

using System;
using UnityEngine;
using System.Collections;
using System.ComponentModel;
using UnityEngine.SceneManagement;

public class PlayerCarController : MonoBehaviour, ICar
{
    [SerializeField] private bool isDebugTest = false;

    [SerializeField] private Transform[] tireTransforms;
    [SerializeField] private Transform[] frontTireTransforms;
    [SerializeField] private Transform[] tireMeshes;
        
    [SerializeField] private Rigidbody carRigidbody;

    [SerializeField] private PlayerCarSpecs carSpecs;
    [SerializeField] private Vector3 customCenterOfMass;
    [SerializeField] private AnimationCurve steerLeftAnimCurve;
    [SerializeField] private AnimationCurve steerRightAnimCurve;
    [SerializeField] private AnimationCurve accelAnimCurve;

    [Category("Input Attributes")]
    private float steeringInput;
    private float accelInput;

    [Category("Global-Script-Attributes")]
    private int tiresCount = 0;
    private float remTime = 0f;
    private float tiresInGround = 0f;

    [Category("Script-Object-Refs.")]
    private PlayerCarSystem carSystem;
    private TimerSystem timerSystem;

    [Category("Tags.")]
    private const string checkpointTag = "Checkpoint";
    private const string finishCheckpointTag = "Finish";

    private RaycastHit hitInfo;
    private bool isGameOver = false;
    private Coroutine GroundCheckCoroutine = null;

    [Category("Action Delegates")]
    public static Action<float> OnCheckpointReached;
    public Action<float, Transform, float, Transform> OnApplyForce;
    public Action<float> OnCarRotate;
    public Action<string> OnGameOver;

    public GameplayManager GameplayManager
    {
        get;
        private set;
    }

    public void Init(GameplayManager gameplayManager)
    {
        this.GameplayManager = gameplayManager;

        isGameOver = false;
        tiresCount = tireTransforms.Length;

        timerSystem = new TimerSystem();
        // remTime = timerSystem.Timer;
        carSystem = new PlayerCarSystem(this, carRigidbody, carSpecs, frontTireTransforms, steerLeftAnimCurve: steerLeftAnimCurve, steerRightAnimCurve: steerRightAnimCurve, accelAnimCurve: accelAnimCurve);
    }

    private void EnableGameOverState()
    {
        return;
        
        OnGameOver?.Invoke("");
        isGameOver = true;
    }

    /* Editor movement inputs */
    private void ProcessInputs()
    {
        accelInput = Input.GetAxis("Vertical");
        steeringInput = Input.GetAxis("Horizontal");
    }

    private void CheckGameOverStates()
    {
        if (isGameOver)
            return;

        /* Check for Time run out */
        if (remTime < 1)
        {
            EnableGameOverState();
            return;
        }

        /* Check for Tires out of bounds (ground/platform) */
        if (tiresInGround < 3 && GroundCheckCoroutine == null)
            GroundCheckCoroutine = StartCoroutine(CheckTiresInGround());
    }

    /* Check if car/rigidbody is out of bounds/ground/platform */
    private IEnumerator CheckTiresInGround()
    {
        yield return new WaitForSeconds(3f);
        if (tiresInGround >= 3)
        {
            StopCoroutine();
        }

        /* Check for dealing with edge cases where 
           car would be moving through the edge of the platforms */
        yield return new WaitForSeconds(2f);

        if (tiresInGround < 3 && !isGameOver)
        {
            EnableGameOverState();
            StopCoroutine();
        }
    }

    private void StopCoroutine()
    {
        if (GroundCheckCoroutine != null)
        {
            StopCoroutine(GroundCheckCoroutine);
            GroundCheckCoroutine = null;
        }
    }

    /* Functions mapped to event triggers of associated buttons */
    public void MoveInput(float input) => accelInput = input;
    public void SteerInput(float input) => steeringInput = input;

    public void RestartLevel()
    {
        StopCoroutine();
        SceneManager.LoadSceneAsync(SceneManager.GetActiveScene().buildIndex);
    }

    #region  Monobehaviour Callbacks

    private void Awake()
    {
        Debug.Log($" Default Center of mass: {carRigidbody.centerOfMass} ");
        carRigidbody.centerOfMass = customCenterOfMass;
    }
    
    /* Apply force to Car's rigidbody for Suspension(Y-Axis), 
       steering(X-Axis), and acceleration(Z-Axis) for each tire. */
    private void FixedUpdate()
    {
        tiresInGround = 0;
        for (int tireIndex = 0; tireIndex < tiresCount; tireIndex++)
        {
            if (Physics.Raycast(tireTransforms[tireIndex].position, -tireTransforms[tireIndex].up, out hitInfo, carSpecs.hitDist))
            {
                tiresInGround++;
                Debug.Log($"## Input :: accelInput: {accelInput}");
                OnApplyForce?.Invoke(hitInfo.distance, tireTransforms[tireIndex], accelInput, tireMeshes[tireIndex]);
            }
        }

        CheckGameOverStates();
    }

    // Updates the timer for UI and Rotation of the wheels (transforms) according to input
    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.R))
            RestartLevel();

        OnCarRotate?.Invoke(steeringInput);

#if UNITY_EDITOR
        if (isDebugTest)
            ProcessInputs();
#endif
    }

    #endregion
}