using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace Escape_Room_Engine.Engine.Scripts
{
    public class Engine : MonoBehaviour
    {
        public static Engine DefaultEngine => FindObjectOfType<Engine>();

        public Material roomMaterial;

        public int NumberOfRooms => _rooms.Count;

        private List<Room> _rooms = new(1);

        public void GenerateRoom()
        {
            // get the last entrance from the newest room or create a spawn passage with no entrance door for where the player will start
            var entrance = NumberOfRooms > 0 ? _rooms[0].exit : new Passage();
            
            var room = new Room(entrance);
            _rooms.Add(room);
            
            GenerateSpace(room, entrance); // TODO: rooms with more than one space
            room.InstantiateRoom(transform, (_rooms.Count - 1).ToString());
        }

        void GenerateSpace(Room room, Passage from)
        {
            var exit = new Passage();
            var size = new SpaceSize(Random.Range(2, 6), Random.Range(2, 6)); // TODO: no hardcoded space size
            var space = new Space(size, from, exit);
            room.AddSpace(space, exit);
        }

        /// <summary>
        /// Dispose of the oldest room to save resources.
        /// </summary>
        public void DisposeOldestRoom()
        {
            if (NumberOfRooms > 0)
            {
                _rooms[NumberOfRooms - 1].Destroy();
                _rooms.RemoveAt(NumberOfRooms - 1);
            }
        }
    }
}