MoveManager.cs

using System.Collections.Generic;
using System.Diagnostics;
using BulletMLLib.SharedProject;
using Godot;

namespace bulletmltemplate
{
  /// <summary>
  /// MoveManager - represents a bullet manager, i.e. something generating bullets such as an enemy character.
  /// </summary>
  public partial class MoveManager : IBulletManager
  {
    private const float timeSpeed = 1.0f;
    private const float scale = 1.0f;

    private readonly List<Mover> movers = new List<Mover>();
    private readonly List<Mover> topLevelMovers = new List<Mover>();

    private readonly PositionDelegate GetPlayerPosition;

    public MoveManager(PositionDelegate playerPosition)
    {
      Debug.Assert(playerPosition != null);
      GetPlayerPosition = playerPosition;
    }

    public void Update(float delta)
    {
      for (var i = 0; i < movers.Count; i++)
      {
        movers[i].Update();
      }

      for (var i = 0; i < topLevelMovers.Count; i++)
      {
        topLevelMovers[i].Update();
      }

      FreeMovers();
    }

    private void FreeMovers()
    {
      for (var i = 0; i < movers.Count; i++)
      {
        if (movers[i].Used) continue;
        movers.RemoveAt(i);
        i--;
      }

      //clear out top level bullets
      for (var i = 0; i < topLevelMovers.Count; i++)
      {
        if (!topLevelMovers[i].TasksFinished()) continue;
        topLevelMovers.RemoveAt(i);
        i--;
      }
    }

    public Vector2 PlayerPosition(IBullet targettedBullet)
    {
      //just give the player's position
      Debug.Assert(null != GetPlayerPosition);
      return GetPlayerPosition();
    }

    public void RemoveBullet(IBullet deadBullet)
    {
      if (deadBullet is Mover myMover)
      {
        myMover.Used = false;
      }
    }

    public IBullet CreateBullet()
    {
      var mover = new Mover(this) { TimeSpeed = timeSpeed, Scale = scale };

      //initialize, store in our list, and return the bullet
      mover.Init();
      movers.Add(mover);
      return mover;
    }

    public IBullet CreateTopBullet()
    {
      var mover = new Mover(this) { TimeSpeed = timeSpeed, Scale = scale };

      //initialize, store in our list, and return the bullet
      mover.Init();
      topLevelMovers.Add(mover);
      return mover;
    }

    public double Tier()
    {
      return 0.0;
    }

    public void Clear()
    {
      movers.Clear();
      topLevelMovers.Clear();
    }

    public void PostUpdate()
    {
      // TODO: use godot game loop
      foreach (var t in movers)
      {
        t.PostUpdate();
      }

      foreach (var t in topLevelMovers)
      {
        t.PostUpdate();
      }
    }
  }
}