using System;
using System.Collections.Generic;
using MedievalParty.Core;
using UnityEngine;

namespace MedievalParty.Map.States
{
    public class MapManager_SpawnState: IState
    {
        public event EventHandler onSpawnOver; 
        
        private readonly List<Transform> _spawnPoints;
        private readonly GameObject _tmp;
        private readonly float _delayBeforeFirstSpawn;
        private readonly float _delayBetweenSpawn;

        private float _delay;
        private int _index;

        public MapManager_SpawnState(List<Transform> spawnPoints, GameObject tmp, float delayBeforeFirstSpawn, float delayBetweenSpawn)
        {
            _spawnPoints = spawnPoints;
            _tmp = tmp;
            _delayBeforeFirstSpawn = delayBeforeFirstSpawn;
            _delayBetweenSpawn = delayBetweenSpawn;
        }

        public void OnEnter()
        {
            _delay = _delayBeforeFirstSpawn;
            _index = 0;
        }
        public void OnExit() { }

        public void OnUpdate()
        {
            _delay -= Time.deltaTime;

            if (_delay <= 0)
            {
                GameObject.Instantiate(_tmp, _spawnPoints[_index].position, Quaternion.identity);

                _delay = _delayBetweenSpawn;
                _index ++;
                
                if(_index >= _spawnPoints.Count)
                    onSpawnOver?.Invoke(this, EventArgs.Empty);
            }
        }
    }
}