peggle-roguelike/EnemyController.cs

using Godot;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

public partial class EnemyController : TurnController
{
    
    public PackedScene _enemyScene = GD.Load<PackedScene>("res://Enemy.tscn");
    public List<Enemy> _enemies = new();
    public PlayerController _playerController;

    public Tween _movementTween;

    public void AddEnemies(int ENEMY_COUNT = 1)
    {
        for (int i = 0; i < ENEMY_COUNT; i++)
        {
            Enemy newEnemy = _enemyScene.Instantiate<Enemy>();
            newEnemy.Death += RemoveEnemy;
            newEnemy.Clicked += HandleEnemyClick;
            newEnemy.RightClicked += HandleEnemyRightClick;

            newEnemy._stamina = Globals._rng.Next(2,4+1);
            newEnemy.Modulate = new Color(newEnemy._stamina == 2 ? "#FF0000" : newEnemy._stamina == 3 ? "#00FF00" : "#0000FF");
            newEnemy._enemyController = this;
            List<Vector2I> unoccupied = [.. _playArea._map._bottomRow.Where(c => _enemies.All(e => e._address != c))];
            Vector2I randomCell = unoccupied[Globals._rng.Next(unoccupied.Count)];
            SetEnemy(newEnemy, randomCell);
            _enemies.Add(newEnemy);
            AddChild(newEnemy);
        }
    }
    public void AddEnemies(List<Vector2I> POSITIONS)
    {
        for (int i = 0; i < POSITIONS.Count; i++)
        {
            Enemy newEnemy = _enemyScene.Instantiate<Enemy>();
            newEnemy.Death += RemoveEnemy;
            newEnemy.Clicked += HandleEnemyClick;
            newEnemy.RightClicked += HandleEnemyRightClick;

            newEnemy._stamina = Globals._rng.Next(2,4+1);
            newEnemy._hitRange = Globals._rng.Next(1,2+1);
            newEnemy.Modulate = new Color(newEnemy._stamina == 2 ? "#FF0000" : newEnemy._stamina == 3 ? "#00FF00" : "#0000FF");
            newEnemy._enemyController = this;
            
            SetEnemy(newEnemy, POSITIONS[i]);
            _enemies.Add(newEnemy);
            AddChild(newEnemy);
        }
        
    }

    public void EnemyAttacks()
    {
        List<Enemy> attackingEnemies = [.. _enemies.Where(e => e.CanAttack())];
        for (int i = 0; i < attackingEnemies.Count; i++)
        {
            Enemy enemy = attackingEnemies[i];
            enemy.Attack(_playerController);
            enemy._staminaRemaining = Math.Max(enemy._staminaRemaining - 2, 0);
        }
    }

    public async Task BuildEnemyPaths()
    {
        Map map = _playArea._map;
        
        for (int i = 0; i < _enemies.Count; i++)
        {
            Enemy enemy = _enemies[i];
            enemy.GetRemainingStamina(map);
        }

        _enemies.ForEach(e => e._path.Clear());

        if (_enemies.All(e => e._staminaRemaining <= 0))
        {
            return;
        }

        while (_enemies.Any(e => e._staminaRemaining > 0))
        {
            for (int i = 0; i < _enemies.Count; i++)
            {
                Enemy enemy = _enemies[i];
                if (enemy._staminaRemaining <= 0)
                {
                    enemy.RemainInPlace();
                    continue;
                }
                if (enemy._address.Y <= map.GetFirstOpenRow())
                {
                    enemy.RemainInPlace();
                    enemy._staminaRemaining = 0;
                    continue;
                }

                List<Vector2I> path = enemy.GetBestPath(map);

                if (path.Count == 0)
                {
                    enemy.RemainInPlace();
                    continue;
                }

                Vector2I cell = path[0];
                if (cell.Y <= enemy._address.Y) // if path would move enemy forward
                {
                    map.SetCellEnemy(cell, enemy);
                    enemy._path.Add(cell);
                }
                else
                {
                    enemy.RemainInPlace();
                }
                
                enemy._staminaRemaining--;
            }
        }
    }

    public void HandleEnemyClick(Enemy ENEMY)
    {
        if (ENEMY._staminaRemaining <= 0){
            return;
        }
        TileMapLayer pathLayer = _playArea.GetNode<TileMapLayer>("PathLayer");
        List<Vector2I> newPath = ENEMY.GetBestPath(_playArea._map);


        pathLayer.GetUsedCells().ToList().ForEach(c => pathLayer.SetCell(c,0,Vector2I.Down*4));
        for (int i = 0; i < newPath.Count; i++)
        {
            pathLayer.SetCell(newPath[i],0,Vector2I.One);
        }
    }

    public void HandleEnemyRightClick(Enemy ENEMY)
    {
        RemoveEnemy(ENEMY);
    }

    public void Initiate()
    {
        List<Vector2I> positions = [.. _playArea.GetNode<TileMapLayer>("InitialPositions").GetUsedCells()];

        AddEnemies(positions);
    }

    public void StepEnemies(int STEP)
    {
        Map map = _playArea._map;
        if (_movementTween != null)
        {
            _movementTween.Kill();
        }
        _movementTween = CreateTween();
        _movementTween.TweenInterval(0.5f);

        for (int i= 0; i < _enemies.Count; i++)
        {
            Enemy enemy = _enemies[i];
            _movementTween.Parallel().TweenProperty(enemy, "global_position", map.GetCellPositionFromAddress(enemy._path[STEP]), 0.25f);
        }
        if (STEP < _enemies[0]._path.Count - 1)
        {
            _movementTween.TweenCallback(Callable.From(() => StepEnemies(STEP + 1)));
        }
        else
        {
            _movementTween.TweenCallback(Callable.From(() => EndTurn()));
        }
    }

    public void RemoveEnemy(Enemy ENEMY_TO_REMOVE)
    {
        _enemies.Remove(ENEMY_TO_REMOVE);
        _playArea._map.SetCellEnemy(ENEMY_TO_REMOVE._address, null);
        ENEMY_TO_REMOVE.QueueFree();
    }

    public void SortEnemies()
    {
        _enemies = [.. _enemies.OrderByDescending(e => e._priority).ThenBy(e => e._address.Y).ThenBy(e => e._path.Count).ThenBy(e => Math.Abs(e._address.X - _playArea._map._maxX / 2))];
    }

    public override async Task StartTurn()
    {
        AddEnemies(1);

        SortEnemies();
        
        EnemyAttacks();

        await BuildEnemyPaths();
        
        StepEnemies(0);
    }

    public void SetEnemy(Enemy ENEMY, Vector2I CELL)
    {
        if (CELL == new Vector2I(16, 14))
        {
            ENEMY._track = true;
        }
        _playArea._map.SetCellEnemy(CELL, ENEMY);
        ENEMY.GlobalPosition = _playArea._map.GetCellPositionFromAddress(CELL);
    }

}