using System;
using System.Collections.Generic;
using System.Linq;
using Godot;
using Entity = Babushka.scripts.CSharp.GameEntity.Entities.Entity;
using PositionalEntity = Babushka.scripts.CSharp.GameEntity.Entities.PositionalEntity;

namespace Babushka.scripts.CSharp.GameEntity.Management;

public partial class EntityManager : Node
{
    [Export] private EntityNodeCreator _nodeCreator = null!;
    
    public EntityNodeCreator NodeCreator => _nodeCreator;

    private EntitySceneContainer? _currentEntitySceneContainer;
    
    public static EntityManager Instance;

    private readonly List<Entity> _allEntities = new();

    public IEnumerable<Entity> AllEntities => _allEntities;

    public IEnumerable<PositionalEntity> AllPositionalEntities => _allEntities.OfType<PositionalEntity>();

    public override void _EnterTree()
    {
        Instance = this;
    }

    public override void _Input(InputEvent @event)
    {
        if (@event.IsActionPressed("DebugEntities"))
        {
            GD.Print("Entities:");
            foreach (var entity in AllEntities)
            {
                GD.Print(entity.EntityType + " " + entity.id);
            }
        }
    }

    public void UnloadScene()
    {
        if (_currentEntitySceneContainer == null) return;
        _currentEntitySceneContainer = null;
    }

    public void LoadScene(EntitySceneContainer sceneContainer)
    {
        _currentEntitySceneContainer = sceneContainer;
        foreach (var entity in AllPositionalEntities)
        {
            _currentEntitySceneContainer.AddIfNeeded(entity);
        }
    }

    public void AddEntity(Entity entity)
    {
        if(!_allEntities.Contains(entity))
            _allEntities.Add(entity);
        if(entity is PositionalEntity positionalEntity && positionalEntity.sceneName == _currentEntitySceneContainer?.sceneName)
            CreateEntityNode(positionalEntity);
    }

    public void CreateEntityNode(PositionalEntity entity)
    {
        if(_currentEntitySceneContainer == null) return;
        entity.AddEntity(_currentEntitySceneContainer);
    }
    
    public EntitySceneContainer? CurrentEntitySceneContainer => _currentEntitySceneContainer;
    
    public void SetSceneContainer(EntitySceneContainer sceneContainer)
    {
        _currentEntitySceneContainer = sceneContainer;
    }
    
    public void UnsetSceneContainer()
    {
        _currentEntitySceneContainer = null;
    }
}