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

public partial class GameManager : Node
{
   [Signal]
   public delegate void OnGameOverEventHandler();
   [Signal]
   public delegate void ReselectCharacterEventHandler(Player player);

   private bool _gameOver = false;

   [Export]
   private Array<PackedScene> PlayerScenes;

   public Array<Character> P1CharactersOut = new Array<Character>();
   public Array<Character> P2CharactersOut = new Array<Character>();

   public IEnumerable<Player> Players = new List<Player>();

   private int _levelIndex;

   public override void _Ready()
   {
      var main = GetTree().Root.GetNode<Main>("/root/Main");
      for (var i = 0; i < main.NumberOfPlayers; i++)
      {
         var player = PlayerScenes[i].Instantiate();
         Players = Players.Append((Player)player);
         GetTree().Root.AddChild(player);
      }
   }

   public void OnAllEnemiesDefeated()
   {
      GD.Print("All enemies defeated");
      P1CharactersOut.AddRange(Players.ElementAt(0).CharactersLeftOnStage);
      if (Players.Count() == 2)
         P2CharactersOut.AddRange(Players.ElementAt(1).CharactersLeftOnStage);
      OnLevelClear();
   }

   public void OnHandleCharacterSelectUI(Player player)
   {
      EmitSignal(SignalName.ReselectCharacter, player);
   }

   public void SetToNextCharacter(Player player)
   {
      player._characterIndex = (++player._characterIndex) % player.CharactersLeftOnStage.Count();
      GD.Print(player.CharactersLeftOnStage.ElementAt(player._characterIndex));
   }

   public void SetToPreviousCharacter(Player player)
   {
      player._characterIndex = player._characterIndex == 0 ? player.CharactersLeftOnStage.Count() - 1 : --player._characterIndex;
   }

   public void ResetPlayerPosition(Player player)
   {
      player.SpawnPoint.SetPlayerPosition(player.SelectedCharacter);
      GD.Print(player.CharactersLeftOnStage.ElementAt(player._characterIndex));
   }

   public void OnCharacterSelected(Player player)
   {
      GD.Print("Instancing...");
      var names = player.CharactersLeftOnStage.Select(x => x.Name).ToArray();
      GD.Print(names);
      var selectedCharacter = player.CharactersLeftOnStage[player._characterIndex];
      player.SelectedCharacter = selectedCharacter;
      GetTree().Root.AddChild(player.SelectedCharacter);
      player.SpawnPoint.SetPlayerPosition(player.SelectedCharacter);
   }

   public void RemoveCharacter(Player player)
   {
      player.CharactersLeftOnStage.Remove(player.CharactersLeftOnStage.ElementAt(player._characterIndex));
      player.SelectedCharacter?.QueueFree();
      player._characterIndex = 0;
      if (player.CharactersLeftOnStage.Any())
         EmitSignal(SignalName.ReselectCharacter, player);
   }

   public void RemoveCharacterAndAddToExit(Character1 character)
   {
      P1CharactersOut.Add(character);
      Players.ElementAt(0).CharactersLeftOnStage.Remove(character);
      GetTree().Root.RemoveChild(character);
      Players.ElementAt(0)._characterIndex = 0;
      if (Players.ElementAt(0).CharactersLeftOnStage.Any())
         EmitSignal(SignalName.ReselectCharacter, Players.ElementAt(0));
   }

   public void RemoveCharacterAndAddToExit(Character2 character)
   {
      P2CharactersOut.Add(character);
      Players.ElementAt(1).CharactersLeftOnStage.Remove(character);
      GetTree().Root.RemoveChild(character);
      Players.ElementAt(1)._characterIndex = 0;
      if (Players.ElementAt(1).CharactersLeftOnStage.Any())
         EmitSignal(SignalName.ReselectCharacter, Players.ElementAt(1));
   }

   public void SetGameOver(bool isGameOver)
   {
      _gameOver = isGameOver;
      if (isGameOver)
         EmitSignal(SignalName.OnGameOver);
   }

   public void OnLevelClear()
   {
      Players.ElementAt(0).CharactersLeftOnStage.AddRange(P1CharactersOut);
      if (Players.Count() == 2)
         Players.ElementAt(1).CharactersLeftOnStage.AddRange(P2CharactersOut);

      P1CharactersOut.Clear();
      if (Players.Count() == 2)
         P2CharactersOut.Clear();

      Players.ElementAt(0)._characterIndex = 0;
      if (Players.Count() == 2)
         Players.ElementAt(1)._characterIndex = 0;

      var players = GetTree().GetNodesInGroup("Player");
      foreach (var player in players)
         GetTree().Root.RemoveChild(player);

      var main = GetTree().Root.GetNode<Main>("/root/Main");

      main.LoadNextLevel(_levelIndex++);

      foreach (var player in Players)
         EmitSignal(SignalName.ReselectCharacter, player);
   }

   public bool IsGameOver => _gameOver;
}