using System.Threading.Tasks;
using UnityEngine;
using BaseGames.Core.Events;

namespace BaseGames.Core.Save
{
    public class EmergencySaveService : MonoBehaviour
    {
        private const int EmergencySlot = 99;

        [SerializeField] private float              _intervalSeconds = 120f;
        [SerializeField] private SaveManager        _saveManager;
        [SerializeField] private BoolEventChannelSO _onGameplayActive;

        private bool  _gameplayActive;
        private float _timer;

        private void OnEnable()
        {
            if (_onGameplayActive != null) _onGameplayActive.OnEventRaised += OnGameplayActiveChanged;
        }

        private void OnDisable()
        {
            if (_onGameplayActive != null) _onGameplayActive.OnEventRaised -= OnGameplayActiveChanged;
        }

        private void OnGameplayActiveChanged(bool value) => _gameplayActive = value;

        private void Update()
        {
            if (!_gameplayActive || _saveManager == null) return;
            _timer += Time.deltaTime;
            if (_timer >= _intervalSeconds)
            {
                _timer = 0f;
                _ = _saveManager.SaveAsync(EmergencySlot);
            }
        }

        public bool HasEmergencySave()
            => _saveManager != null && _saveManager.SlotExists(EmergencySlot);

        public async Task PromoteToSlot(int targetSlot)
        {
            if (_saveManager == null) return;
            // Phase 1 stub：完整实现在 Phase 2 LocalFileStorage API
            await Task.CompletedTask;
        }
    }
}