using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using GLFrameworkEngine;

namespace MapStudio.UI

{

public class StudioSystem

{

/// <summary>

/// The active instance of the studio system.

/// </summary>

public static StudioSystem Instance;

/// <summary>

/// A list of actors in the scene.

/// </summary>

public List<ActorBase> Actors = new List<ActorBase>();

/// <summary>

/// Determines if the game timer is playing or not.

/// </summary>

public bool IsPlaying => Timer.IsPlaying;

private GameTimer Timer = new GameTimer();

public StudioSystem() {

Timer.OnFrameUpdate += OnFrameUpdate;

}

/// <summary>

/// Runs the current scene during the calculation loop.

/// </summary>

public void Run() { Timer.Play(); }

/// <summary>

/// Pauses all current scene calculations.

/// </summary>

public void Pause() { Timer.Pause(); }

public void AddActor(ActorBase actor)

{

if (Actors.Contains(actor)) //Actor already added

return;

actor.CreateIdx = Actors.Count;

actor.Age = 0;

Actors.Add(actor);

}

public void RemoveActor(ActorBase actor)

{

if (!Actors.Contains(actor)) //Actor already removed

return;

Actors.Remove(actor);

actor.CreateIdx = -1;

}

private bool updating = false;

private void OnFrameUpdate(object sender, EventArgs e)

{

if (updating) return;

updating = true;

//Make sure the list is set as another list to prevent conflicts if the actor list is updated

var actors = Actors.ToList();

Begin(actors);

CalculateScene(actors);

updating = false;

}

private void Begin(List<ActorBase> actors)

{

//Reset the default settings

for (int i = 0; i < actors.Count; i++)

actors[i].BeginFrame();

}

/// <summary>

/// Calculates the current scene and is calculated each frame.

/// </summary>

public void CalculateScene(List<ActorBase> actors)

{

//Force update the viewport to update the render cache

GLContext.ActiveContext.UpdateViewport = true;

AnimationStats.Reset();

foreach (var actor in actors)

actor.Calc();

//Make sure to update the window directly during scene calculation.

//This is due to these being calculated on another thread so it is better to store them in the window.

MapStudio.UI.StatisticsWindow.SkeletalAnims = AnimationStats.SkeletalAnims;

MapStudio.UI.StatisticsWindow.MaterialAnims = AnimationStats.MaterialAnims;

}

public void Dispose()

{

this.Timer?.Dispose();

foreach (var actor in Actors)

actor.Dispose();

}

}

}