```xml using System; using System.Collections.Generic; using UnityEngine; public class MissionManager : MonoBehaviour { public static MissionManager Instance { get; private set; } [SerializeField] private TruckController truckController; [SerializeField] private List missions = new List(); [SerializeField] private Mission currentMission; private void Awake() { if (Instance == null) { Instance = this; DontDestroyOnLoad(gameObject); } else { Destroy(gameObject); } } private void Start() { if (missions.Count > 0) { StartMission(missions[0]); } } public void StartMission(Mission mission) { currentMission = mission; currentMission.OnMissionStarted(); } public void CompleteCurrentMission() { if (currentMission != null) { currentMission.OnMissionCompleted(); SaveGameState(); } } private void SaveGameState() { // Save truck position PlayerPrefs.SetFloat("TruckPosX", truckController.transform.position.x); PlayerPrefs.SetFloat("TruckPosY", truckController.transform.position.y); PlayerPrefs.SetFloat("TruckPosZ", truckController.transform.position.z); // Save current mission progress PlayerPrefs.SetInt("CurrentMissionIndex", missions.IndexOf(currentMission)); PlayerPrefs.Save(); } public void LoadGameState() { if (PlayerPrefs.HasKey("TruckPosX")) { Vector3 savedPosition = new Vector3( PlayerPrefs.GetFloat("TruckPosX"), PlayerPrefs.GetFloat("TruckPosY"), PlayerPrefs.GetFloat("TruckPosZ")); truckController.transform.position = savedPosition; } if (PlayerPrefs.HasKey("CurrentMissionIndex")) { int missionIndex = PlayerPrefs.GetInt("CurrentMissionIndex"); if (missionIndex < missions.Count) { StartMission(missions[missionIndex]); } } } } using UnityEngine; public abstract class Mission : MonoBehaviour { public string missionName; public string description; public bool isCompleted; public abstract void OnMissionStarted(); public abstract void OnMissionCompleted(); public abstract bool CheckMissionComplete(); } using UnityEngine; public class DeliverTrailerMission : Mission { [SerializeField] private TrailerController trailer; [SerializeField] private Transform deliveryPoint; [SerializeField] private float deliveryRadius = 5f; public override void OnMissionStarted() { isCompleted = false; Debug.Log($"Mission started: {missionName}"); } public override void OnMissionCompleted() { isCompleted = true; Debug.Log($"Mission completed: {missionName}"); } public override bool CheckMissionComplete() { if (trailer == null || deliveryPoint == null) return false; // Check if trailer is detached and near delivery point bool isTrailerDetached = !trailer.IsAttached; bool isNearDeliveryPoint = Vector3.Distance(trailer.transform.position, deliveryPoint.position) <= deliveryRadius; return isTrailerDetached && isNearDeliveryPoint; } private void Update() { if (!isCompleted && CheckMissionComplete()) { OnMissionCompleted(); MissionManager.Instance.CompleteCurrentMission(); } } private void OnDrawGizmos() { if (deliveryPoint != null) { Gizmos.color = Color.green; Gizmos.DrawWireSphere(deliveryPoint.position, deliveryRadius); } } } using UnityEngine; public class TruckController : MonoBehaviour { [Header("Movement")] [SerializeField] private float moveSpeed = 10f; [SerializeField] private float turnSpeed = 100f; [Header("Trailer")] [SerializeField] private Transform trailerAttachPoint; [SerializeField] private float attachDistance = 2f; [SerializeField] private LayerMask trailerLayer; private Rigidbody rb; private TrailerController attachedTrailer; private float horizontalInput; private float verticalInput; private void Awake() { rb = GetComponent(); } private void Update() { GetInput(); HandleTrailerAttachment(); } private void FixedUpdate() { Move(); Turn(); } private void GetInput() { horizontalInput = Input.GetAxis("Horizontal"); verticalInput = Input.GetAxis("Vertical"); } private void Move() { Vector3 moveDirection = transform.forward * verticalInput * moveSpeed * Time.fixedDeltaTime; rb.MovePosition(rb.position + moveDirection); } private void Turn() { float turnAmount = horizontalInput * turnSpeed * Time.fixedDeltaTime; Quaternion turnRotation = Quaternion.Euler(0f, turnAmount, 0f); rb.MoveRotation(rb.rotation * turnRotation); } private void HandleTrailerAttachment() { if (Input.GetKeyDown(KeyCode.E)) { if (attachedTrailer == null) { TryAttachTrailer(); } else { DetachTrailer(); } } } private void TryAttachTrailer() { Collider[] trailers = Physics.OverlapSphere(trailerAttachPoint.position, attachDistance, trailerLayer); if (trailers.Length > 0) { TrailerController trailer = trailers[0].GetComponent(); if (trailer != null && !trailer.IsAttached) { AttachTrailer(trailer); } } } private void AttachTrailer(TrailerController trailer) { attachedTrailer = trailer; trailer.AttachToTruck(this, trailerAttachPoint); } private void DetachTrailer() { if (attachedTrailer != null) { attachedTrailer.DetachFromTruck(); attachedTrailer = null; } } private void OnDrawGizmos() { if (trailerAttachPoint != null) { Gizmos.color = Color.yellow; Gizmos.DrawWireSphere(trailerAttachPoint.position, attachDistance); } } } using UnityEngine; public class TrailerController : MonoBehaviour { public bool IsAttached { get; private set; } private Rigidbody rb; private Transform attachPoint; private TruckController attachedTruck; private Vector3 offset; private void Awake() { rb = GetComponent(); } private void FixedUpdate() { if (IsAttached && attachedTruck != null) { Vector3 targetPosition = attachedTruck.transform.TransformPoint(offset); rb.MovePosition(targetPosition); rb.MoveRotation(attachedTruck.transform.rotation); } } public void AttachToTruck(TruckController truck, Transform attachPoint) { attachedTruck = truck; this.attachPoint = attachPoint; offset = truck.transform.InverseTransformPoint(transform.position); IsAttached = true; rb.isKinematic = true; } public void DetachFromTruck() { IsAttached = false; attachedTruck = null; rb.isKinematic = false; } } ```