using System.Collections.Generic;
using System.Linq;
using Components;
using Core;
using UnityEngine;
using Application = Core.Application;

namespace Systems
{
    public class TileManager : SystemBase
    {
        [SerializeField] private Transform spawnPoint;
        
        [SerializeField] private int visibleTiles;
        [SerializeField] private float tileLength;

        public float TileOffset => tileLength;

        private Queue<GroundTile> _tiles;

        private PoolSystem _pool;
        private PoolSystem ObjectPool
        {
            get
            {
                if (_pool == null) _pool = Application.GetSystem<PoolSystem>();
                return _pool;
            }
        }

        protected override void ReleaseReferences()
        {
            PlayerHolder.OnLoopOffsetReach -= SwapTiles;
        }

        public override void Initialize()
        {
            _tiles = new Queue<GroundTile>();
            PlayerHolder.OnLoopOffsetReach += SwapTiles;
        }

        public override void StartSystem()
        {
            GenerateTiles();
            base.StartSystem();
        }

        private void GenerateTiles()
        {
            for (var i = 0; i < visibleTiles; i++)
            {
                var tile = ObjectPool.Spawn<GroundTile>(ObjectList.Tile, spawnPoint);
                tile.SetPosition(i, tileLength);
                _tiles.Enqueue(tile);
            }
        }

        private void SwapTiles()
        {
            if (_tiles.IsNullOrEmpty()) return;
            var currentTile = _tiles.Dequeue();
            var lastTile = _tiles.LastOrDefault();
            if (ReferenceEquals(lastTile, null)) return;
            currentTile.SetPosition(lastTile.GroundIndex + 1, tileLength);
            _tiles.Enqueue(currentTile);
        }
    }
}