#if UNITY_EDITOR
/*******************************************************************************
The content of this file includes portions of the proprietary AUDIOKINETIC Wwise
Technology released in source code form as part of the game integration package.
The content of this file may not be used without valid licenses to the
AUDIOKINETIC Wwise Technology.
Note that the use of the game engine is subject to the Unity(R) Terms of
Service at https://unity3d.com/legal/terms-of-service
 
License Usage
 
Licensees holding valid licenses to the AUDIOKINETIC Wwise Technology may use
this file in accordance with the end user license agreement provided with the
software or, alternatively, in accordance with the terms contained
in a written agreement between you and Audiokinetic Inc.
Copyright (c) 2023 Audiokinetic Inc.
*******************************************************************************/

using System.Threading;

public class AkWwiseFileWatcher
{
	private static readonly AkWwiseFileWatcher instance = new AkWwiseFileWatcher();
	public static AkWwiseFileWatcher Instance { get { return instance; } }

	private System.IO.FileSystemWatcher XmlWatcher;
	private System.IO.FileSystemWatcher WprojWatcher;
	private bool XmlExceptionOccurred;
	private bool ProjectExceptionOccurred;
	private bool xmlChanged;
	private bool wprojChanged;

	public event System.Action XMLUpdated;
	public event System.Action<string> WwiseProjectUpdated;
	public System.Func<bool> PopulateXML;
	private string generatedSoundbanksPath;
	private string wwiseProjectPath;

	private AkWwiseFileWatcher()
	{
		if (UnityEditor.EditorApplication.isPlayingOrWillChangePlaymode && !UnityEditor.EditorApplication.isPlaying)
		{
			return;
		}

		StartWatchers();
	}

	public void StartWatchers()
	{
		generatedSoundbanksPath = AkBasePathGetter.GetPlatformBasePath();
		wwiseProjectPath = AkBasePathGetter.GetWwiseProjectDirectory();

		new Thread(CreateXmlWatcher).Start();
		new Thread(CreateProjectWatcher).Start();

		WwiseProjectUpdated += AkUtilities.SoundBankDestinationsUpdated;
		UnityEditor.EditorApplication.update += OnEditorUpdate;
	}

	public void CreateXmlWatcher()
	{

		try
		{
			if (XmlWatcher != null)
			{
				XmlWatcher.Dispose();
			}

			XmlWatcher = new System.IO.FileSystemWatcher(generatedSoundbanksPath) {Filter = "*.xml", IncludeSubdirectories = true, };
			// Event handlers that are watching for specific event
			XmlWatcher.Created += RaiseXmlFlag;
			XmlWatcher.Changed += RaiseXmlFlag;

			XmlWatcher.NotifyFilter = System.IO.NotifyFilters.LastWrite;
			XmlWatcher.EnableRaisingEvents = true;
			XmlExceptionOccurred = false;
		}
		catch
		{
			XmlExceptionOccurred = true;
		}
	}

	public void CreateProjectWatcher()
	{

		try
		{
			if (WprojWatcher != null)
			{
				WprojWatcher.Dispose();
			}

			WprojWatcher = new System.IO.FileSystemWatcher(wwiseProjectPath) { Filter = "*.wproj", IncludeSubdirectories = false, };
			// Event handlers that are watching for specific event
			WprojWatcher.Created += RaiseProjectFlag;
			WprojWatcher.Changed += RaiseProjectFlag;

			WprojWatcher.NotifyFilter = System.IO.NotifyFilters.LastWrite;
			WprojWatcher.EnableRaisingEvents = true;
			ProjectExceptionOccurred= false;
		}
		catch
		{
			ProjectExceptionOccurred = true;
		}
	}


	private void OnEditorUpdate()
	{
		HandleXmlChange();
		HandleWprojChange();
	}

	private void HandleXmlChange()
	{
		var logWarnings = AkBasePathGetter.LogWarnings;
		AkBasePathGetter.LogWarnings = false;
		generatedSoundbanksPath = AkBasePathGetter.GetPlatformBasePath();

		if (XmlExceptionOccurred || generatedSoundbanksPath != XmlWatcher?.Path)
		{
			if (!System.IO.Directory.Exists(generatedSoundbanksPath))
			{
				return;
			}
			new Thread(CreateXmlWatcher).Start();
		}
		
		if (!xmlChanged)
			return;

		xmlChanged = false;

		var populate = PopulateXML;
		if (populate == null || !populate())
			return;

		var callback = XMLUpdated;
		if (callback != null)
		{
			callback();
		}
	}


	private void HandleWprojChange()
	{
		wwiseProjectPath = AkBasePathGetter.GetWwiseProjectDirectory();

		if (ProjectExceptionOccurred || wwiseProjectPath != WprojWatcher?.Path)
		{
			if (!System.IO.Directory.Exists(wwiseProjectPath))
            {
				return;
			}
			new Thread(CreateProjectWatcher).Start();
		}

		if (!wprojChanged)
			return;

		wprojChanged = false;
		WwiseProjectUpdated?.Invoke(WprojWatcher.Path);
	}

	private void RaiseXmlFlag(object sender, System.IO.FileSystemEventArgs e)
	{
		xmlChanged = true;
	}


	private void RaiseProjectFlag(object sender, System.IO.FileSystemEventArgs e)
	{
		wprojChanged = true;
	}
}
#endif