using System;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using Object = UnityEngine.Object;

public class SkinDownloadManager : MonoBehaviour
{
    public Shader ShaderAtlas;
	#region Unity Singleton
	private static SkinDownloadManager _instance;

	public static SkinDownloadManager Instance
	{
		get
		{
			if (_instance == null)
			{
				_instance = FindObjectOfType(typeof(SkinDownloadManager)) as SkinDownloadManager;
				if (_instance == null)
				{
					AVDebug.LogError(string.Format("No gameObject with {0} component exists. Make sure to create a gameObject with {0} component", new System.Diagnostics.StackFrame().GetMethod().DeclaringType));
				}
			}

			return _instance;
		}
	}

	void Awake()
	{
        Caching.CleanCache();
        if (_instance != null && _instance != this)
		{
			AVDebug.LogWarning(string.Format("{0} Instance already exists on another gameObject. Destroying this gameObject {1}", this.GetType().Name, gameObject.name));
			Destroy(gameObject);
			return;
		}

		_instance = this;
		DontDestroyOnLoad(gameObject);

        //DownloadBundleDevice.Extract();
        //Debug.LogError("Awake");
	}
	#endregion

	public ScreenBase applyingSkinProgressIndicator;
	public Transform sceneryAnchor;
		
	List<Object> _loadedObjects = new List<Object>();
	
	const int NUM_OF_SUB_PARTS = 1;
	//int _subPartsDownloadedSoFar;
	bool _downloadInProgress;
	public const int BUNDLES_VERSION = 3; //TODO not sure how to use this value properly yet
	
	List<string> _queuedSkinsForDownload = new List<string>();

	bool _isSkinBeingAppliedAtLaunch = true;
	
	public void DownloadSkin(string skinId)
	{
		_queuedSkinsForDownload.Add(skinId);
		if (!_downloadInProgress)
		{
			StartCoroutine(ProcessQueueCoroutine());
		}
	}
	
	IEnumerator ProcessQueueCoroutine()
	{
		while (_queuedSkinsForDownload.Count > 0)
		{
			string skinId = _queuedSkinsForDownload[0];
			_queuedSkinsForDownload.RemoveAt(0);
			yield return StartCoroutine(DownloadSkinCoroutine(skinId));
		}
	}
	
	IEnumerator DownloadSkinCoroutine(string skinId)
	{
        Debug.Log("DownloadSkinCoroutine " + skinId);
		//_subPartsDownloadedSoFar = 0;
		_downloadInProgress = true;
		yield return StartCoroutine(DownloadAndCacheCoroutine(skinId, "Backgrounds"));
		//If the previous sub part failed, the downloadInProgress would have been set to false
		if (_downloadInProgress)
		{
			yield return StartCoroutine(DownloadAndCacheCoroutine(skinId, GetAtlasNameAccordingToResolution()));
		}
		//If the previous sub part failed, the downloadInProgress would have been set to false
		if (_downloadInProgress)
		{
			yield return StartCoroutine(DownloadAndCacheCoroutine(skinId, "Scenery"));
		}
		if (_downloadInProgress)
		{
			//All subparts are available and in cache
			NotificationCenter.Post(NotificationType.SkinDownloadCompleted, skinId);
			_downloadInProgress = false;
		}
	}

	IEnumerator DownloadAndCacheCoroutine(string skinId, string subPart)
	{
		//string url = GetSubPartURL(skinId, subPart);
		//AVDebug.Log("Loading asset bundle from "+url);

		// Wait for the Caching system to be ready
		while (!Caching.ready)
		{
			yield return null;
		}

        NotificationCenter.Post(NotificationType.SkinDownloadProgress, new object[] { skinId, 1 });

        // Load the AssetBundle file from Cache if it exists with the same version or download and store it in the cache
//#if UNITY_EDITOR
//        using (WWW www = new WWW(url)) //don't use caching in editor
//#else
//		using (WWW www = WWW.LoadFromCacheOrDownload (url, BUNDLES_VERSION))
//#endif
//		{
//			while (!www.isDone)
//			{
//				float skinDownloadProgress = (_subPartsDownloadedSoFar/NUM_OF_SUB_PARTS) + (www.progress / NUM_OF_SUB_PARTS);
//				NotificationCenter.Post(NotificationType.SkinDownloadProgress, new object[] {skinId, skinDownloadProgress});
//				yield return null;
//			}
			
//			if (www.error != null)
//			{
//				AVDebug.LogError("WWW download had an error:" + www.error);
//				_downloadInProgress = false;
//				NotificationCenter.Post (NotificationType.SkinDownloadFailed, skinId);
//			} else
//			{
//				AVDebug.Log ("Asset bundle downloaded "+url);
//			}
			
//			++_subPartsDownloadedSoFar;

//			// Frees the memory from the web stream
//			www.Dispose ();
//		}
	}

    public static string GetSubPartPath(string skinId, string subPart)
    {
        string filename = skinId + "_" + subPart;// + ".unity3d";
#if UNITY_EDITOR || UNITY_ANDROID
        filename = "Android/" + filename;
#else
        filename = "iPhone/" + filename;
#endif

        return filename;
        //AssetBundle.CreateFromMemory()
        

//#if !UNITY_WEBPLAYER
//        if (skinId == "default")
//        {
//            string url = Application.persistentDataPath + "/" + AssetBundleUtils.GetBuildTargetPrefix() + "/" + filename;
//#if UNITY_EDITOR || UNITY_IOS || UNITY_ANDROID
//            url = "file:///" + url; //On Android we there is some jar:file// prefix automatically by Application.streamingAssetsPath
//#endif
//            Debug.Log("GetSubPartURL " + url);
//            return url;
//        }
//        else
//#endif
//        {
//            Debug.Log("AssetBundleUtils.GetAssetBundlesURL() filename " + AssetBundleUtils.GetAssetBundlesURL() + "/" + filename);
//            return AssetBundleUtils.GetAssetBundlesURL() + "/" + filename;
//        }
    }

    public static string GetSubPartURL(string skinId, string subPart)
	{
		string filename = skinId+"_"+subPart+".unity3d";
#if !UNITY_WEBPLAYER
		if (skinId == "default")
		{
			string url = Application.persistentDataPath+"/"+AssetBundleUtils.GetBuildTargetPrefix()+"/"+filename;
#if UNITY_EDITOR || UNITY_IOS || UNITY_ANDROID
				url = "file:///"+url; //On Android we there is some jar:file// prefix automatically by Application.streamingAssetsPath
#endif
		    Debug.Log("GetSubPartURL " + url);
            return url;
		} else
#endif
		{
            Debug.Log("AssetBundleUtils.GetAssetBundlesURL() filename " + AssetBundleUtils.GetAssetBundlesURL() + "/" + filename);
            return AssetBundleUtils.GetAssetBundlesURL() + "/"+filename;
		}
	}
	
	public void ApplyCachedSkin(string skinId)
	{
		Debug.Log("Applying skin "+skinId);
		StartCoroutine(ApplyCachedSkinCoroutine(skinId));
	}
	
	IEnumerator ApplyCachedSkinCoroutine(string skinId)
	{
		if (!_isSkinBeingAppliedAtLaunch)
		{
			if(applyingSkinProgressIndicator!=null)
			applyingSkinProgressIndicator.Show();
			yield return new WaitForSeconds(0.5f);
		}
		yield return StartCoroutine(ApplyCachedSkinSubPartCoroutine(skinId, "background", "ApplyBackgroundsCoroutine"));
		NotificationCenter.Post(NotificationType.ApplyingSkinProgress, 0.33f);
		yield return StartCoroutine(ApplyCachedSkinSubPartCoroutine(skinId, GetAtlasNameAccordingToResolution(), "ApplyAtlasCoroutine"));
		NotificationCenter.Post(NotificationType.ApplyingSkinProgress, 0.66f);
		yield return StartCoroutine(ApplyCachedSkinSubPartCoroutine(skinId, "scenery", "ApplySceneryCoroutine"));
		NotificationCenter.Post(NotificationType.ApplyingSkinProgress, 1f);
		if (!_isSkinBeingAppliedAtLaunch)
		{
			if(applyingSkinProgressIndicator!= null)
			applyingSkinProgressIndicator.Hide();
		} else
		{
			_isSkinBeingAppliedAtLaunch = false;
		}
		NotificationCenter.Post(NotificationType.SkinApplied);
		System.GC.Collect();
        Resources.UnloadUnusedAssets();
	}

	IEnumerator ApplyCachedSkinSubPartCoroutine(string skinId, string subPart, string onCompleteCoroutineName)
	{
	    var path = GetSubPartPath(skinId, subPart);
        Debug.Log("Path " + path);
	    var asynk = AssetBundle.LoadFromMemoryAsync(Resources.Load<TextAsset>(path).bytes);
	    yield return asynk;

        yield return StartCoroutine(onCompleteCoroutineName, asynk.assetBundle);
//        string url = GetSubPartURL(skinId, subPart);
//		AVDebug.Log("Loading cached asset bundle from "+url);

//		// Wait for the Caching system to be ready
//		while (!Caching.ready)
//		{
//			yield return null;
//		}
//        Debug.LogWarning(url);
//#if UNITY_EDITOR
//        using (WWW www = new WWW(url)) //don't use caching in editor
        
//#else
//		using (WWW www = WWW.LoadFromCacheOrDownload (url, BUNDLES_VERSION))
//#endif
//        {
//            yield return www;

//            if (www.error != null)
//            {
//                Debug.LogError(www.error);
//                //AVDebug.LogError("WWW cached download for "+url+" had an error:" + www.error);
//            }
//            else
//            {
//                //AVDebug.Log("Successfully downloaded asset bundle from "+url);
//                Debug.LogWarning(www.url);
//                yield return StartCoroutine(onCompleteCoroutineName, www);
//            }

//            // Frees the memory from the web stream
//            www.Dispose();
//        }
	}
	
	IEnumerator ApplyBackgroundsCoroutine(AssetBundle www)
	{
		//Clear anything from the previous loaded asset bundle
		foreach (Object loadedObj in _loadedObjects)
		{
			AVDebug.Log ("Destroying "+loadedObj);
			DestroyImmediate(loadedObj, true);
		}
		_loadedObjects.Clear();
	    //Debug.Log(www.url);
		AssetBundle bundle = www;//.assetBundle;
		
		// Load the object asynchronously
		Texture2D[] textures = new Texture2D[3];
		for (int i = 0; i < 3; i++)
		{
			AssetBundleRequest request = bundle.LoadAssetAsync("texture" + i, typeof(Texture2D));
		
			// Wait for completion
			yield return request;
			
			// Get the reference to the loaded object
			Texture2D texture = (Texture2D)request.asset;
			AVDebug.Log ("texture "+texture.name+" width "+texture.width);
			textures[i] = texture;
			
			_loadedObjects.Add(texture);
		}
		
		NotificationCenter.Post(NotificationType.ApplySkinBackgrounds, textures);

		// Unload the AssetBundles compressed contents to conserve memory
		bundle.Unload (false);
	}

	IEnumerator ApplyAtlasCoroutine(AssetBundle www)
	{
		AssetBundle bundle = www;//.assetBundle;
	    
	   /* foreach (var VARIABLE in bundle.GetAllAssetNames())
	    {
            Debug.Log(VARIABLE);
        }*/
        //Debug.Log(www.url);
		string resolutionSuffix = GetSuffixAccordingToResolution();

		// Load the objects asynchronously
		AtlasBundle atlasBundle = new AtlasBundle();
		AssetBundleRequest request = bundle.LoadAssetAsync("GameAtlas" + resolutionSuffix, typeof(Texture2D));
		yield return request;
		atlasBundle.atlasSheet = request.asset as Texture2D;
		_loadedObjects.Add(atlasBundle.atlasSheet);
		
	    var name = ("GameAtlas" + resolutionSuffix);//.ToLower();
        //Debug.Log(name);
        request = bundle.LoadAssetAsync(name, typeof(GameObject));
        //Debug.Log(request.asset);
        yield return request;
		try
		{
            //Debug.Log(request.asset.name);
            /*for (int i = 0; i < request.asset; i++)
            {
                Debug.Log(request.allAssets[i].name);
            }*/
             //Debug.Log(request.asset);
			atlasBundle.atlasPrefab = ((GameObject)request.asset).GetComponent<UIAtlas>();
		    atlasBundle.atlasPrefab.spriteMaterial.shader = ShaderAtlas;
        }
		catch (Exception)
		{
			

			throw;
		}
		//Debug.Log(((GameObject)request.asset).GetComponent<UIAtlas>());
		
		_loadedObjects.Add(atlasBundle.atlasPrefab);

		request = bundle.LoadAssetAsync("ButtonFont" + resolutionSuffix, typeof(GameObject));
		yield return request;
		atlasBundle.buttonFontPrefab = ((GameObject)request.asset).GetComponent<UIFont>();
		atlasBundle.buttonFontPrefab.atlas = atlasBundle.atlasPrefab;
		_loadedObjects.Add(atlasBundle.buttonFontPrefab);

		request = bundle.LoadAssetAsync("ScoreFont" + resolutionSuffix, typeof(GameObject));
		yield return request;
		atlasBundle.scoreFontPrefab = ((GameObject)request.asset).GetComponent<UIFont>();
		_loadedObjects.Add(atlasBundle.scoreFontPrefab);

		request = bundle.LoadAssetAsync("TextFont" + resolutionSuffix, typeof(GameObject));
		yield return request;
		atlasBundle.textFontPrefab = ((GameObject)request.asset).GetComponent<UIFont>();
		_loadedObjects.Add(atlasBundle.textFontPrefab);

		NotificationCenter.Post(NotificationType.ApplyAtlasBundle, atlasBundle);

		// Unload the AssetBundles compressed contents to conserve memory
		bundle.Unload (false);
	}

	IEnumerator ApplySceneryCoroutine(AssetBundle www)
	{
		AssetBundle bundle = www;//.assetBundle;
	    Debug.Log(www.ToString());
		AssetBundleRequest request = bundle.LoadAssetAsync("Scenery", typeof(GameObject));
		GameObject sceneryPrefab = (GameObject)request.asset;
		_loadedObjects.Add(sceneryPrefab);
		Destroy(GameObject.Find("Scenery"));
		GameObject scenery = (GameObject)Instantiate(sceneryPrefab);
		scenery.name = "Scenery";
		scenery.SetActive(true);

		// Unload the AssetBundles compressed contents to conserve memory
		bundle.Unload (false);
		yield return request;
	}

	public static string GetAtlasNameAccordingToResolution()
	{
		return GetSuffixAccordingToResolution();
	}

	public static string GetSuffixAccordingToResolution()
	{
		if (ResolutionSwitchController.IsSHD)
		{
			return "SHD";
		} else
		if (ResolutionSwitchController.IsHD)
		{
            return "HD";
		} else
		//if (ResolutionSwitchController.IsSD)
		{
			return "SD";
		}
	}


	
	
}