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

namespace ClassicalSharp {
	
	public static class OptionsKey {
		
		public const string ViewDist = "viewdist";
		public const string DefaultTexturePack = "defaulttexpack";
		public const string SingleplayerPhysics = "singleplayerphysics";
		public const string UseMusic = "usemusic";
		public const string UseSound = "usesound";
		public const string NamesMode = "namesmode";
		public const string InvertMouse = "invertmouse";
		public const string Sensitivity = "mousesensitivity";
		public const string FpsLimit = "fpslimit";
		public const string AutoCloseLauncher = "autocloselauncher";
		public const string ViewBobbing = "viewbobbing";
		public const string EntityShadow = "entityshadow";
		public const string RenderType = "normal";
		public const string SmoothLighting = "gfx-smoothlighting";
		
		public const string HacksEnabled = "hacks-hacksenabled";
		public const string FieldOfView = "hacks-fov";
		public const string Speed = "hacks-speedmultiplier";
		public const string ModifiableLiquids = "hacks-liquidsbreakable";
		public const string PushbackPlacing = "hacks-pushbackplacing";
		public const string NoclipSlide = "hacks-noclipslide";
		public const string CameraClipping = "hacks-cameraclipping";
		public const string DoubleJump = "hacks-doublejump";
		public const string FullBlockStep = "hacks-fullblockstep";
		
		public const string TabAutocomplete = "gui-tab-autocomplete";
		public const string ShowBlockInHand = "gui-blockinhand";
		public const string ChatLines = "gui-chatlines";
		public const string ClickableChat = "gui-chatclickable";
		public const string ArialChatFont = "gui-arialchatfont";
		public const string HotbarScale = "gui-hotbarscale";
		public const string InventoryScale = "gui-inventoryscale";
		public const string ChatScale = "gui-chatscale";
		public const string ShowFPS = "gui-showfps";
		public const string FontName = "gui-fontname";
		public const string BlackTextShadows = "gui-blacktextshadows";
		
		public const string AllowCustomBlocks = "nostalgia-customblocks";
		public const string UseCPE = "nostalgia-usecpe";
		public const string AllowServerTextures = "nostalgia-servertextures";
		public const string UseClassicGui = "nostalgia-classicgui";
		public const string SimpleArmsAnim = "nostalgia-simplearms";
		public const string UseClassicTabList = "nostalgia-classictablist";
		public const string UseClassicOptions = "nostalgia-classicoptions";
		public const string AllowClassicHacks = "nostalgia-hacks";
	}
	
	public enum FpsLimitMethod {
		LimitVSync, Limit30FPS, Limit60FPS, Limit120FPS, LimitNone,
	}
	
	public static class Options {
		
		public static Dictionary<string, string> OptionsSet = new Dictionary<string, string>();
		public static List<string> OptionsChanged = new List<string>();
		const string Filename = "options.txt";
		
		static bool TryGetValue( string key, out string value ) {
			if( OptionsSet.TryGetValue( key, out value ) ) return true;
			int index = key.IndexOf( '-' );
			
			if( index == -1 ) return false;
			return OptionsSet.TryGetValue( key.Substring( index + 1 ), out value );
		}
		
		public static string Get( string key ) {
			string value;
			return TryGetValue( key, out value ) ? value : null;
		}
		
		public static int GetInt( string key, int min, int max, int defValue ) {
			string value;
			int valueInt = 0;
			if( !TryGetValue( key, out value ) || !Int32.TryParse( value, out valueInt ) )
				return defValue;

			Utils.Clamp( ref valueInt, min, max );
			return valueInt;
		}
		
		public static bool GetBool( string key, bool defValue ) {
			string value;
			bool valueBool = false;
			if( !TryGetValue( key, out value ) || !Boolean.TryParse( value, out valueBool ) )
				return defValue;
			return valueBool;
		}
		
		public static float GetFloat( string key, float min, float max, float defValue ) {
			string value;
			float valueFloat = 0;
			if( !TryGetValue( key, out value ) || !Single.TryParse( value, out valueFloat ) )
				return defValue;
			Utils.Clamp( ref valueFloat, min, max );
			return valueFloat;
		}
		
		public static T GetEnum<T>( string key, T defValue ) {
			string value = Get( key.ToLower() );
			if( value == null ) {
				Set( key, defValue );
				return defValue;
			}
			
			T mapping;
			if( !Utils.TryParseEnum( value, defValue, out mapping ) )
				Set( key, defValue );
			return mapping;
		}
		
		public static void Set( string key, string value ) {
			key = key.ToLower();
			if( value != null ) {
				OptionsSet[key] = value;
			} else {
				OptionsSet.Remove( key );
			}
			
			if( !OptionsChanged.Contains( key ) )
				OptionsChanged.Add( key );
		}
		
		public static void Set<T>( string key, T value ) {
			key = key.ToLower();
			if( value != null ) {
				OptionsSet[key] = value.ToString();
			} else {
				OptionsSet.Remove( key );
			}
			
			if( !OptionsChanged.Contains( key ) )
				OptionsChanged.Add( key );
		}
		
		public static bool Load() {
			// Both of these are from when running from the launcher
			if( Program.AppDirectory == null )
				Program.AppDirectory = AppDomain.CurrentDomain.BaseDirectory;
			string defZip = Path.Combine( Program.AppDirectory, "default.zip" );
			string texDir = Path.Combine( Program.AppDirectory, TexturePack.Dir );
			if( File.Exists( defZip ) || !Directory.Exists( texDir ) )
				Program.CleanupMainDirectory();
			
			try {
				string path = Path.Combine( Program.AppDirectory, Filename );
				using( Stream fs = File.OpenRead( path ) )
					using( StreamReader reader = new StreamReader( fs, false ) )
						LoadFrom( reader );
				return true;
			} catch( FileNotFoundException ) {
				return true;
			} catch( IOException ex ) {
				ErrorHandler.LogError( "loading options", ex );
				return false;
			}
		}
		
		static void LoadFrom( StreamReader reader ) {
			string line;
			// remove all the unchanged options
			List<string> toRemove = new List<string>();
			foreach( KeyValuePair<string, string> kvp in OptionsSet ) {
				if( !OptionsChanged.Contains( kvp.Key ) )
					toRemove.Add( kvp.Key );
			}
			for( int i = 0; i < toRemove.Count; i++ )
				OptionsSet.Remove( toRemove[i] );
			
			while( (line = reader.ReadLine()) != null ) {
				if( line.Length == 0 || line[0] == '#' ) continue;
				
				int sepIndex = line.IndexOf( '=' );
				if( sepIndex <= 0 ) continue;
				string key = Utils.ToLower( line.Substring( 0, sepIndex ) );
				
				sepIndex++;
				if( sepIndex == line.Length ) continue;
				string value = line.Substring( sepIndex, line.Length - sepIndex );
				if( !OptionsChanged.Contains( key ) )
					OptionsSet[key] = value;
			}
		}
		
		public static bool Save() {
			try {
				string path = Path.Combine( Program.AppDirectory, Filename );
				using( Stream fs = File.Create( path ) )
					using( StreamWriter writer = new StreamWriter( fs ) )
				{
					SaveTo( writer );
				}
				
				OptionsChanged.Clear();
				return true;
			} catch( IOException ex ) {
				ErrorHandler.LogError( "saving options", ex );
				return false;
			}
		}
		
		static void SaveTo( StreamWriter writer ) {
			foreach( KeyValuePair<string, string> pair in OptionsSet ) {
				writer.Write( pair.Key );
				writer.Write( '=' );
				writer.Write( pair.Value );
				writer.WriteLine();
			}
		}
	}
}