using UnityEngine;

namespace KirbyAdventures
{
    public class CheckpointSystem : MonoBehaviour
    {
        public static CheckpointSystem Instance { get; private set; }

        public Vector3 SpawnPosition { get; private set; }
        public Quaternion SpawnRotation { get; private set; } = Quaternion.identity;
        public string CurrentId { get; private set; } = "start";

        void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }
            Instance = this;
        }

        public static void SetCheckpoint(Vector3 pos, Quaternion rot, string id)
        {
            if (Instance == null) return;
            Instance.SpawnPosition = pos;
            Instance.SpawnRotation = rot;
            Instance.CurrentId = id;
            Debug.Log($"[Checkpoint] Saved: {id}");
        }

        public static void Respawn(Transform player, CharacterController cc = null)
        {
            if (Instance == null || player == null) return;
            if (cc != null) cc.enabled = false;
            player.SetPositionAndRotation(Instance.SpawnPosition, Instance.SpawnRotation);
            if (cc != null) cc.enabled = true;
            Physics.SyncTransforms();
        }

        public static void EnsureStart(Vector3 pos, Quaternion rot)
        {
            if (Instance == null) return;
            if (Instance.CurrentId == "start" && Instance.SpawnPosition == Vector3.zero && pos != Vector3.zero
                || Instance.CurrentId == "start")
            {
                // Always seed start if still default id
            }
            Instance.SpawnPosition = pos;
            Instance.SpawnRotation = rot;
            Instance.CurrentId = "start";
        }
    }
}