// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using ClassicalSharp.Blocks;
using OpenTK;

namespace ClassicalSharp {

	public enum SoundType : byte {
		None, Wood, Gravel, Grass, Stone,
		Metal, Glass, Cloth, Sand, Snow,
	}
	
	public enum BlockDraw : byte {
		Opaque, Transparent, TransparentLeaves,
		Translucent, Gas, Sprite,
	}
	
	public enum CollideType : byte {
		WalkThrough, // i.e. gas or sprite
		SwimThrough, // i.e. liquid
		Solid,       // i.e. solid
	}
	
	/// <summary> Stores various properties about the blocks in Minecraft Classic. </summary>
	public partial class BlockInfo {
		
		/// <summary> Gets whether the given block id is transparent/fully see through. </summary>
		/// <remarks> Alpha values are treated as either 'fully see through' or 'fully solid'. </remarks>
		public bool[] IsTransparent = new bool[Block.Count];
		
		/// <summary> Gets whether the given block id is translucent/partially see through. </summary>
		/// <remarks>Colour values are blended into both the transparent and opaque blocks behind them. </remarks>
		public bool[] IsTranslucent = new bool[Block.Count];
		
		/// <summary> Gets whether the given block id is opaque/not partially see through. </summary>
		public bool[] IsOpaque = new bool[Block.Count];
		
		// <summary> Gets whether the given block id is opaque/not partially see through on the y axis. </summary>
		//public bool[] IsOpaqueY = new bool[Block.Count];
		
		/// <summary> Gets whether the given block id is a sprite. (e.g. flowers, saplings, fire) </summary>
		public bool[] IsSprite = new bool[Block.Count];
		
		/// <summary> Gets whether the given block id is a liquid. (water and lava) </summary>
		public bool IsLiquid( byte block ) { return block >= Block.Water && block <= Block.StillLava; }
		
		/// <summary> Gets whether the given block blocks sunlight. </summary>
		public bool[] BlocksLight = new bool[Block.Count];
		
		/// <summary> Gets whether the given block should draw all it faces with a full white colour component. </summary>
		public bool[] FullBright = new bool[Block.Count];
		
		public string[] Name = new string[Block.Count];
		
		/// <summary> Gets the custom fog colour that should be used when the player is standing within this block.
		/// Note that this is only used for exponential fog mode. </summary>
		public FastColour[] FogColour = new FastColour[Block.Count];
		
		public float[] FogDensity = new float[Block.Count];
		
		public CollideType[] Collide = new CollideType[Block.Count];
		
		public float[] SpeedMultiplier = new float[Block.Count];
		
		public bool[] CullWithNeighbours = new bool[Block.Count];
		
		public byte[] LightOffset = new byte[Block.Count];
		
		public uint[] DefinedCustomBlocks = new uint[Block.Count >> 5];
		
		public SoundType[] DigSounds = new SoundType[Block.Count];
		
		public SoundType[] StepSounds = new SoundType[Block.Count];
		
		public void Reset( Game game ) {
			Init();
			// TODO: Make this part of TerrainAtlas2D maybe?
			using( FastBitmap fastBmp = new FastBitmap( game.TerrainAtlas.AtlasBitmap, true, true ) )
				RecalculateSpriteBB( fastBmp );
		}
		
		public void Init() {
			for( int i = 0; i < DefinedCustomBlocks.Length; i++ ) 
				DefinedCustomBlocks[i] = 0;			
			for( int block = 0; block < Block.Count; block++ )
				ResetBlockProps( (byte)block );
			UpdateCulling();
		}

		public void SetDefaultBlockPerms( InventoryPermissions place, 
		                                 InventoryPermissions delete ) {
			for( int block = Block.Stone; block <= Block.MaxDefinedBlock; block++ ) {
				place[block] = true;
				delete[block] = true;
			}
			place[Block.Lava] = false;
			place[Block.Water] = false;
			place[Block.StillLava] = false;
			place[Block.StillWater] = false;
			place[Block.Bedrock] = false;
			
			delete[Block.Bedrock] = false;
			delete[Block.Lava] = false;
			delete[Block.Water] = false;
			delete[Block.StillWater] = false;
			delete[Block.StillLava] = false;
		}
		
		public void SetBlockDraw( byte id, BlockDraw draw ) {
			IsTranslucent[id] = draw == BlockDraw.Translucent;
			IsAir[id] = draw == BlockDraw.Gas;
			IsSprite[id] = draw == BlockDraw.Sprite;
			CullWithNeighbours[id] = draw != BlockDraw.TransparentLeaves;
			
			IsTransparent[id] = draw != BlockDraw.Opaque && draw != BlockDraw.Translucent;
			IsOpaque[id] = draw == BlockDraw.Opaque;
		}
		
		public void ResetBlockProps( byte id ) {
			BlocksLight[id] = DefaultSet.BlocksLight( id );
			FullBright[id] = DefaultSet.FullBright( id );
			CullWithNeighbours[id] = id != Block.Leaves;
			FogColour[id] = DefaultSet.FogColour( id );
			FogDensity[id] = DefaultSet.FogDensity( id );
			Collide[id] = DefaultSet.Collide( id );
			DigSounds[id] = DefaultSet.DigSound( id );
			StepSounds[id] = DefaultSet.StepSound( id );
			SetBlockDraw( id, DefaultSet.Draw( id ) );
			SpeedMultiplier[id] = 1;
			Name[id] = DefaultName( id );
			
			if( IsSprite[id] ) {
				MinBB[id] = new Vector3( 2.50f/16f, 0, 2.50f/16f );
				MaxBB[id] = new Vector3( 13.5f/16f, 1, 13.5f/16f );
			} else {
				MinBB[id] = Vector3.Zero;
				MaxBB[id] = Vector3.One;
				MaxBB[id].Y = DefaultSet.Height( id );
			}
			LightOffset[id] = CalcLightOffset( id );
			
			if( id >= Block.CpeCount ) {
				SetTex( 0, Side.Top, id );
				SetTex( 0, Side.Bottom, id );
				SetSide( 0, id );
			} else {
				SetTex( topTex[id], Side.Top, id );
				SetTex( bottomTex[id], Side.Bottom, id );
				SetSide( sideTex[id], id );
			}
		}
		
		static StringBuffer buffer = new StringBuffer( 64 );
		static string DefaultName( byte block ) {
			if( block >= Block.CpeCount ) return "Invalid";
			
			// Find start and end of this particular block name
			int start = 0;
			for( int i = 0; i < block; i++)
				start = Block.Names.IndexOf( ' ', start ) + 1;
			int end = Block.Names.IndexOf( ' ', start );
			if( end == -1 ) end = Block.Names.Length;
			
			buffer.Clear();
			SplitUppercase( buffer, start, end );
			return buffer.ToString();
		}
		
		static void SplitUppercase( StringBuffer buffer, int start, int end ) {
			int index = 0;
			for( int i = start; i < end; i++ ) {
				char c = Block.Names[i];
				bool upper = Char.IsUpper( c ) && i > start;
				bool nextLower = i < end - 1 && !Char.IsUpper( Block.Names[i + 1] );
				
				if( upper && nextLower ) {
					buffer.Append( ref index, ' ' );
					buffer.Append( ref index, Char.ToLower( c ) );
				} else {
					buffer.Append( ref index, c );
				}
			}
		}
	}
}