using Godot;
using Godot.Collections;
using System.Linq;

public partial class Main : Node
{
   [Export]
   public Array<PackedScene> Levels;
   [Export]
   public PackedScene GameManager;

   public int NumberOfPlayers = 0;

   public void LoadLevel(int indexToLoad, int numberOfPlayers)
   {
      var sceneToLoad = Levels.ElementAt(indexToLoad);
      CallDeferred(nameof(DeferredGoToScene), sceneToLoad);
      
      NumberOfPlayers = numberOfPlayers;

      var gameManager = GameManager.Instantiate();
      AddChild(gameManager);
      var gameManagerInstance = (GameManager)gameManager;

      gameManagerInstance.OnHandleCharacterSelectUI(gameManagerInstance.Players.ElementAt(0));
      if (numberOfPlayers == 2)
         gameManagerInstance.OnHandleCharacterSelectUI(gameManagerInstance.Players.ElementAt(1));

      var bgmPlayer = GetTree().Root.GetNode<BGMPlayer>("BgmPlayer");
      bgmPlayer.ProcessMode = ProcessModeEnum.Always;
      bgmPlayer.SetBGMFromFilepath("Audio/BGM/LevelTheme.ogg");
      bgmPlayer.PlayBGM();

      GetTree().Paused = true;
   }

   public void LoadNextLevel(int currentSceneIndex)
   {
      if (currentSceneIndex < Levels.Count())
      {
         var currentScene = Levels.ToList().ElementAt(currentSceneIndex);
         var nextScene = currentSceneIndex + 1;
         CallDeferred(nameof(DeferredGoToScene), Levels.ElementAt(nextScene), currentScene);
      }
   }

   private void DeferredGoToScene(PackedScene sceneToAdd)
   {
      var nextScene = GD.Load<PackedScene>(sceneToAdd.ResourcePath);
      var newScene = nextScene.Instantiate();
      GetTree().Root.AddChild(newScene);
      GetTree().Paused = true;
   }

   private void DeferredGoToScene(PackedScene sceneToAdd, PackedScene sceneToRemove)
   {
      GetTree().GetFirstNodeInGroup("Level").QueueFree();
      var nextScene = GD.Load<PackedScene>(sceneToAdd.ResourcePath);
      var newScene = nextScene.Instantiate();
      GetTree().Root.AddChild(newScene);
      GetTree().Paused = true;
   }
}