// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.IO;
using ClassicalSharp.Network;

namespace Launcher.Patcher {
	
	public sealed class ResourceFetcher {
		
		public bool Done = false;
		internal AsyncDownloader downloader;
		SoundPatcher digPatcher, stepPatcher;
		
		const string jarClassicUri = "http://s3.amazonaws.com/Minecraft.Download/versions/c0.30_01c/c0.30_01c.jar";
		const string jar162Uri = "http://s3.amazonaws.com/Minecraft.Download/versions/1.6.2/1.6.2.jar";
		const string pngTerrainPatchUri = "http://static.classicube.net/terrain-patch.png";
		const string pngGuiPatchUri = "http://static.classicube.net/gui.png";
		const string digSoundsUri = "http://s3.amazonaws.com/MinecraftResources/sound3/dig/";
		const string altDigSoundsUri = "http://s3.amazonaws.com/MinecraftResources/sound3/random/";
		const string stepSoundsUri = "http://s3.amazonaws.com/MinecraftResources/newsound/step/";
		const string altStepSoundsUri = "http://s3.amazonaws.com/MinecraftResources/sound3/step/";
		const string musicUri = "http://s3.amazonaws.com/MinecraftResources/music/";
		const string newMusicUri = "http://s3.amazonaws.com/MinecraftResources/newmusic/";
		
		ushort flags;
		public void DownloadItems( AsyncDownloader downloader, Action<string> setStatus ) {
			this.downloader = downloader;
			DownloadMusicFiles();
			digPatcher = new SoundPatcher( ResourceList.DigSounds, "dig_", "step_cloth1" );
			digPatcher.FetchFiles( digSoundsUri, altDigSoundsUri, this, DigSoundsExist );
			stepPatcher = new SoundPatcher( ResourceList.StepSounds, "step_", "classic jar" );
			stepPatcher.FetchFiles( stepSoundsUri, altStepSoundsUri, this, StepSoundsExist );
			
			flags = 0;
			foreach( var entry in ResourceList.Files )
				flags |= entry.Value;
			
			if( (flags & ResourceList.cMask) != 0 )
				downloader.DownloadData( jarClassicUri, false, "classic_jar" );
			if( (flags & ResourceList.mMask) != 0 )
				downloader.DownloadData( jar162Uri, false, "162_jar" );
			if( (flags & ResourceList.gMask) != 0 )
				downloader.DownloadData( pngGuiPatchUri, false, "gui_patch" );
			if( (flags & ResourceList.tMask) != 0 )
				downloader.DownloadData( pngTerrainPatchUri, false, "terrain_patch" );
			SetFirstStatus( setStatus );
		}
		
		void DownloadMusicFiles() {
			string[] files = ResourceList.MusicFiles;
			for( int i = 0; i < files.Length; i++ ) {
				if( musicExists[i] ) continue;
				string baseUri = i < 3 ? musicUri : newMusicUri;
				string url = baseUri + files[i] + ".ogg";
				downloader.DownloadData( url, false, files[i] );
			}
		}
		
		public void AddDownload( string url, string identifier ) {
			downloader.DownloadData( url, false, identifier );
		}
		
		void SetFirstStatus( Action<string> setStatus ) {
			for( int i = 0; i < musicExists.Length; i++ ) {
				if( musicExists[i] ) continue;
				setStatus( MakeNext( ResourceList.MusicFiles[i] ) );
				return;
			}
			setStatus( MakeNext( FirstItem() ) );
		}
		
		
		internal byte[] jarClassic, jar162, pngTerrainPatch, pngGuiPatch;
		public bool Check( Action<string> setStatus ) {
			if( Done ) return true;
			
			if( !CheckMusicFiles( setStatus ) )
				return false;
			if( !digPatcher.CheckDownloaded( this, setStatus ) )
				return false;
			if( !stepPatcher.CheckDownloaded( this, setStatus ) )
				return false;
			
			if( !Download( "classic_jar", "classic jar", "1.6.2 jar", ref jarClassic, setStatus ) )
				return false;
			if( !Download( "162_jar", "1.6.2 jar", "gui.png", ref jar162, setStatus ) )
				return false;
			if( !Download( "gui_patch", "gui.png patch", "terrain.png patch", ref pngGuiPatch, setStatus ) )
				return false;
			if( !Download( "terrain_patch", "terrain.png patch", null, ref pngTerrainPatch, setStatus ) )
				return false;

			Done |= IsDone();
			return true;
		}
		
		string FirstItem() {
			if( !DigSoundsExist ) return "dig_cloth1";
			if( !StepSoundsExist ) return "step_cloth1";
			
			if( (flags & ResourceList.cMask) != 0 ) 
				return "classic jar";
			if( (flags & ResourceList.mMask) != 0 ) 
				return "1.6.2 jar";
			if( (flags & ResourceList.gMask) != 0 ) 
				return "gui.png patch";
			if( (flags & ResourceList.tMask) != 0 ) 
				return "terrain.png patch";
			return "(unknown)";
		}
		
		bool IsDone() {
			if( flags == 0 ) return stepPatcher.Done;
			if( (flags & ResourceList.tMask) != 0 ) 
				return pngTerrainPatch != null;
			if( (flags & ResourceList.gMask) != 0 ) 
				return pngGuiPatch != null;
			if( (flags & ResourceList.mMask) != 0 ) 
				return jar162 != null;
			if( (flags & ResourceList.cMask) != 0 ) 
				return jarClassic != null;
			return true;
		}
		
		bool Download( string identifier, string name, string next,
		              ref byte[] data, Action<string> setStatus ) {
			DownloadedItem item;
			if( downloader.TryGetItem( identifier, out item ) ) {
				Console.WriteLine( "got resource " + identifier );
				if( item.Data == null ) {
					setStatus( "&cFailed to download " + name );
					return false;
				}
				
				if( next != null )
					setStatus( MakeNext( next ) );
				else
					setStatus( "&eCreating default.zip.." );
				data = (byte[])item.Data;
				return true;
			}
			return true;
		}
		
		const string lineFormat = "&eFetching {0}.. ({1}/{2})";
		public string MakeNext( string next ) {
			CurrentResource++;
			return String.Format( lineFormat, next,
			                     CurrentResource, ResourcesCount );
		}
		
		bool CheckMusicFiles( Action<string> setStatus ) {
			string[] files = ResourceList.MusicFiles;
			for( int i = 0; i < files.Length; i++ ) {
				string next = i < files.Length - 1 ? files[i + 1] : "dig_cloth1";
				string name = files[i];
				byte[] data = null;
				if( !Download( name, name, next, ref data, setStatus ) )
					return false;
				
				if( data == null ) continue;
				string path = Path.Combine( Program.AppDirectory, "audio" );
				path = Path.Combine( path, name + ".ogg" );
				File.WriteAllBytes( path, data );
			}
			return true;
		}
		
		public void CheckResourceExistence() {
			ResourceChecker checker = new ResourceChecker();
			checker.CheckResourceExistence();
			
			AllResourcesExist = checker.AllResourcesExist;
			DigSoundsExist = checker.DigSoundsExist;
			StepSoundsExist = checker.StepSoundsExist;
			
			DownloadSize = checker.DownloadSize;
			ResourcesCount = checker.ResourcesCount;
			musicExists = checker.musicExists;
		}
		
		public bool AllResourcesExist, DigSoundsExist, StepSoundsExist;
		public float DownloadSize;
		public int ResourcesCount, CurrentResource;
		bool[] musicExists = new bool[7];
	}
}