using System;
using UnityEngine;

namespace EndingSystem
{
    public class EndingWinConditionService : MonoBehaviour
    {
        public static EndingWinConditionService Instance { get; private set; }

        [Header("Win Condition")]
        [SerializeField] private bool canTriggerEnding = false;

        [Header("Lifetime")]
        [SerializeField] private bool dontDestroyOnLoad = true;

        public event Action<bool> CanTriggerEndingChanged;

        public bool CanTriggerEnding => canTriggerEnding;

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

            Instance = this;
            if (dontDestroyOnLoad) { DontDestroyOnLoad(gameObject); }
        }

        public void SetCanTriggerEnding(bool value)
        {
            if (canTriggerEnding == value) { return; }
            canTriggerEnding = value;
            CanTriggerEndingChanged?.Invoke(canTriggerEnding);
        }

        public void UnlockEnding()
        {
            SetCanTriggerEnding(true);
        }

        public void DebugUnlockEnding()
        {
            EnsureInstance().UnlockEnding();
        }

        public void LockEnding()
        {
            SetCanTriggerEnding(false);
        }

        public void DebugLockEnding()
        {
            EnsureInstance().LockEnding();
        }

        public static EndingWinConditionService EnsureInstance()
        {
            if (Instance != null) { return Instance; }

            EndingWinConditionService existing = FindObjectOfType<EndingWinConditionService>(true);
            if (existing != null)
            {
                Instance = existing;
                return Instance;
            }

            var go = new GameObject("EndingWinConditionService");
            var service = go.AddComponent<EndingWinConditionService>();
            Instance = service;
            return service;
        }
    }
}