lsh4/Assets/Scripts/Mechanics/GameSystems/CheckpointTrigger.cs

using UnityEngine;

/// <summary>
/// Place this component on a GameObject to create a checkpoint zone.
/// When the player enters, it will save the current game state.
/// </summary>
[RequireComponent(typeof(BoxCollider))]
public class CheckpointTrigger : MonoBehaviour
{
    [Header("Checkpoint Settings")]
    [Tooltip("Show a visual effect when checkpoint is activated")]
    public bool showVisualFeedback = true;
    
    [Tooltip("Only trigger once, or every time player enters")]
    public bool oneTimeUse = false;
    
    [Tooltip("Custom checkpoint message")]
    public string checkpointMessage = "Checkpoint Saved";
    
    [Header("Visual Feedback")]
    public GameObject checkpointVFX;
    public AudioClip checkpointSound;
    
    private bool hasBeenTriggered = false;
    private BoxCollider triggerCollider;
    private AudioSource audioSource;

    private void Awake()
    {
        // Ensure collider is trigger
        triggerCollider = GetComponent<BoxCollider>();
        if (triggerCollider != null)
        {
            triggerCollider.isTrigger = true;
        }
        
        // Setup audio source if sound is assigned
        if (checkpointSound != null)
        {
            audioSource = gameObject.AddComponent<AudioSource>();
            audioSource.clip = checkpointSound;
            audioSource.playOnAwake = false;
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        // Check if player entered
        if (other.CompareTag("Player"))
        {
            // If one-time use and already triggered, ignore
            if (oneTimeUse && hasBeenTriggered)
                return;
            
            ActivateCheckpoint();
        }
    }

    /// <summary>
    /// Activate this checkpoint and save game state
    /// </summary>
    public void ActivateCheckpoint()
    {
        CheckpointSystem checkpointSystem = CheckpointSystem.Instance;
        
        if (checkpointSystem != null)
        {
            // Save checkpoint at this position
            checkpointSystem.SaveCheckpointAt(transform.position, transform.rotation);
            
            Debug.Log($"[Checkpoint] {checkpointMessage} at {transform.position}");
            
            // Show feedback
            if (showVisualFeedback)
            {
                ShowFeedback();
            }
            
            hasBeenTriggered = true;
        }
        else
        {
            Debug.LogWarning("[Checkpoint] CheckpointSystem not found!");
        }
    }

    private void ShowFeedback()
    {
        // Play sound
        if (audioSource != null && checkpointSound != null)
        {
            audioSource.Play();
        }
        
        // Spawn VFX
        if (checkpointVFX != null)
        {
            GameObject vfx = Instantiate(checkpointVFX, transform.position, Quaternion.identity);
            Destroy(vfx, 3f); // Auto-cleanup after 3 seconds
        }
        
        // Optional: Show UI message (you can implement this with your UI system)
        Debug.Log($"[Checkpoint] ✓ {checkpointMessage}");
    }

    /// <summary>
    /// Reset this checkpoint so it can be triggered again
    /// </summary>
    public void ResetCheckpoint()
    {
        hasBeenTriggered = false;
    }

    // Visualize checkpoint in editor
    private void OnDrawGizmos()
    {
        Gizmos.color = hasBeenTriggered ? Color.green : Color.yellow;
        Gizmos.DrawWireCube(transform.position, Vector3.one * 2f);
        
        Gizmos.color = Color.cyan;
        Gizmos.DrawLine(transform.position, transform.position + Vector3.up * 3f);
    }
}