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#if UNITY_EDITOR

using System;

using System.Collections.Generic;

using System.IO;

using System.Threading;

using UnityEngine;

using UnityEngine.Networking;

namespace UnityEditor.Experimental.EditorVR.Modules

{

public class WebModule : MonoBehaviour

{

class DownloadRequest

{

public string key; // For queuing

public UnityWebRequest request;

public event Action<DownloadHandler> completed;

public void Complete()

{

var handler = request.downloadHandler;

if (completed != null)

completed(handler);

}

}

class TextureRequest

{

public string key; // For queuing

public UnityWebRequest request;

public event Action<DownloadHandlerTexture> completed;

public void Complete()

{

var handler = (DownloadHandlerTexture)request.downloadHandler;

if (completed != null)

completed(handler);

}

}

class FileTransfer

{

public bool isDone;

public event Action completed;

public void Complete()

{

if (completed != null)

completed();

}

}

// Assume all requests to the same url are the same. If this changes, use entire header as the key

const int k_MaxSimultaneousRequests = 8;

const int k_MaxSimultaneousTransfers = 8;

readonly Dictionary<string, DownloadRequest> m_Requests = new Dictionary<string, DownloadRequest>();

readonly Queue<DownloadRequest> m_QueuedRequests = new Queue<DownloadRequest>();

readonly Dictionary<string, TextureRequest> m_TextureRequests = new Dictionary<string, TextureRequest>();

readonly Queue<TextureRequest> m_QueuedTextureRequests = new Queue<TextureRequest>();

readonly List<FileTransfer> m_Transfers = new List<FileTransfer>();

readonly Queue<FileTransfer> m_QueuedTransfers = new Queue<FileTransfer>();

List<string> m_CompletedRequests = new List<string>(20);

List<FileTransfer> m_CompletedTransfers = new List<FileTransfer>(20);

/// <summary>

/// Download a resource at the given URL and call a method on completion, providing the DownloadHandler

/// </summary>

/// <param name="url">The URL of the resource</param>

/// <param name="completed">The completion callback</param>

public void Download(string url, Action<DownloadHandler> completed)

{

DownloadRequest request;

if (!m_Requests.TryGetValue(url, out request))

{

var webRequest = UnityWebRequest.Get(url);

webRequest.SendWebRequest();

request = new DownloadRequest { key = url, request = webRequest };

if (m_Requests.Count < k_MaxSimultaneousRequests)

m_Requests.Add(url, request);

else

m_QueuedRequests.Enqueue(request);

}

request.completed += completed;

}

/// <summary>

/// Download a texture at a given URL and call a method on completion, providing the DownloadTextureHandler

/// </summary>

/// <param name="url">The URL of the resource</param>

/// <param name="completed">The completion callback</param>

public void DownloadTexture(string url, Action<DownloadHandlerTexture> completed)

{

TextureRequest request;

if (!m_TextureRequests.TryGetValue(url, out request))

{

var webRequest = UnityWebRequest.Get(url);

webRequest.downloadHandler = new DownloadHandlerTexture();

webRequest.SendWebRequest();

request = new TextureRequest { key = url, request = webRequest };

if (m_Requests.Count < k_MaxSimultaneousRequests)

m_TextureRequests.Add(url, request);

else

m_QueuedTextureRequests.Enqueue(request);

}

request.completed += completed;

}

/// <summary>

/// Download a resource at the given URL to the given destination file and call a method on completion

/// </summary>

/// <param name="url">The URL of the resource</param>

/// <param name="destination">The destination file path</param>

/// <param name="completed">The completion callback</param>

public void Download(string url, string destination, Action completed)

{

Download(url, handler =>

{

var transfer = new FileTransfer();

transfer.completed += completed;

m_Transfers.Add(transfer);

var data = handler.data;

new Thread(() =>

{

File.WriteAllBytes(destination, data);

transfer.isDone = true;

}).Start();

});

}

void Update()

{

foreach (var kvp in m_Requests)

{

var request = kvp.Value;

var webRequest = request.request;

if (webRequest.isDone && webRequest.downloadHandler.isDone)

{

var error = webRequest.error;

if (!string.IsNullOrEmpty(error))

Debug.LogWarning(error);

request.Complete();

m_CompletedRequests.Add(kvp.Key);

}

}

foreach (var request in m_CompletedRequests)

{

m_Requests.Remove(request);

}

while (m_Requests.Count < k_MaxSimultaneousRequests && m_QueuedRequests.Count > 0)

{

var first = m_QueuedRequests.Dequeue();

m_Requests.Add(first.key, first);

}

//TODO: Generalize Request class

m_CompletedRequests.Clear();

foreach (var kvp in m_TextureRequests)

{

var request = kvp.Value;

var webRequest = request.request;

if (webRequest.isDone && webRequest.downloadHandler.isDone)

{

var error = webRequest.error;

if (!string.IsNullOrEmpty(error))

Debug.LogWarning(error);

request.Complete();

m_CompletedRequests.Add(kvp.Key);

}

}

foreach (var request in m_CompletedRequests)

{

m_TextureRequests.Remove(request);

}

while (m_TextureRequests.Count < k_MaxSimultaneousRequests && m_QueuedTextureRequests.Count > 0)

{

var first = m_QueuedTextureRequests.Dequeue();

m_TextureRequests.Add(first.key, first);

}

foreach (var transfer in m_Transfers)

{

if (transfer.isDone)

{

transfer.Complete();

m_CompletedTransfers.Add(transfer);

}

}

foreach (var transfer in m_CompletedTransfers)

{

m_Transfers.Remove(transfer);

}

while (m_Transfers.Count < k_MaxSimultaneousTransfers && m_QueuedTransfers.Count > 0)

{

var first = m_QueuedTransfers.Dequeue();

m_Transfers.Add(first);

}

m_CompletedRequests.Clear();

m_CompletedTransfers.Clear();

}

}

}

#endif