/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

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Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/
#include "CCTileMapAtlas.h"
#include "CCXFileUtils.h"
#include "CCTextureAtlas.h"

namespace cocos2d {


	// implementation CCTileMapAtlas

	CCTileMapAtlas * CCTileMapAtlas::tileMapAtlasWithTileFile(const char *tile, const char *mapFile, int tileWidth, int tileHeight)
	{
		CCTileMapAtlas *pRet = new CCTileMapAtlas();
		if (initWithTileFile(tile, mapFile, tileWidth, tileHeight))
		{
			pRet->autorelease();
			return pRet;
		}
		CCX_SAFE_DELETE(pRet);
		return NULL;
	}
	bool CCTileMapAtlas::initWithTileFile(const char *tile, const char *mapFile, int tileWidth, int tileHeight)
	{
		this->loadTGAfile(mapFile);
		this->calculateItemsToRender();
		if( __super::initWithTileFile(tile, tileWidth, tileHeight, m_nItemsToRender) )
		{
			m_pPosToAtlasIndex = new StringToIntegerDictionary();
			this->updateAtlasValues();
			this->setContentSize(CGSizeMake((float)(m_pTGAInfo->width*m_nItemWidth),
											(float)(m_pTGAInfo->height*m_nItemHeight)));
			return true;
		}
		return false;
	}
	CCTileMapAtlas::~CCTileMapAtlas()
	{
		if (m_pTGAInfo)
		{
			tgaDestroy(m_pTGAInfo);
		}
		if (m_pPosToAtlasIndex)
		{
			m_pPosToAtlasIndex->clear();
			delete m_pPosToAtlasIndex;
		}
	}
	void CCTileMapAtlas::releaseMap()
	{
		if (m_pTGAInfo)
		{
			tgaDestroy(m_pTGAInfo);
		}
		m_pTGAInfo = NULL;

		if (m_pPosToAtlasIndex)
		{
			m_pPosToAtlasIndex->clear();
			delete m_pPosToAtlasIndex;
			m_pPosToAtlasIndex = NULL;
		}
	}
	void CCTileMapAtlas::calculateItemsToRender()
	{
		NSAssert( m_pTGAInfo != NULL, "tgaInfo must be non-nil");

		m_nItemsToRender = 0;
		for(int x=0;x < m_pTGAInfo->width; x++ ) 
		{
			for( int y=0; y < m_pTGAInfo->height; y++ ) 
			{
				ccColor3B *ptr = (ccColor3B*) m_pTGAInfo->imageData;
				ccColor3B value = ptr[x + y * m_pTGAInfo->width];
				if( value.r )
				{
					++m_nItemsToRender;
				}
			}
		}
	}
	void CCTileMapAtlas::loadTGAfile(const char *file)
	{
		NSAssert( file != NULL, "file must be non-nil");

		//	//Find the path of the file
		//	NSBundle *mainBndl = [CCDirector sharedDirector].loadingBundle;
		//	NSString *resourcePath = [mainBndl resourcePath];
		//	NSString * path = [resourcePath stringByAppendingPathComponent:file];

		m_pTGAInfo = tgaLoad( CCFileUtils::fullPathFromRelativePath(file) );
	#if 1
		if( m_pTGAInfo->status != TGA_OK ) 
		{
			NSAssert(0, "TileMapAtlasLoadTGA : TileMapAtas cannot load TGA file");
		}
	#endif
	}

	// CCTileMapAtlas - Atlas generation / updates
	void CCTileMapAtlas::setTile(ccColor3B tile, ccGridSize position)
	{
		NSAssert( m_pTGAInfo != NULL, "tgaInfo must not be nil");
		NSAssert( m_pPosToAtlasIndex != NULL, "posToAtlasIndex must not be nil");
		NSAssert( position.x < m_pTGAInfo->width, "Invalid position.x");
		NSAssert( position.y < m_pTGAInfo->height, "Invalid position.x");
		NSAssert( tile.r != 0, "R component must be non 0");

		ccColor3B *ptr = (ccColor3B*)m_pTGAInfo->imageData;
		ccColor3B value = ptr[position.x + position.y * m_pTGAInfo->width];
		if( value.r == 0 )
		{
			CCLOG("cocos2d: Value.r must be non 0.");
		} 
		else
		{
			ptr[position.x + position.y * m_pTGAInfo->width] = tile;

			// XXX: this method consumes a lot of memory
			// XXX: a tree of something like that shall be impolemented
			char buffer[32];
			std::string key = itoa(position.x, buffer, 10);
			key += ",";
			key += itoa(position.y, buffer, 10);
			int num = m_pPosToAtlasIndex->find(key)->second;
			this->updateAtlasValueAt(position, tile, num);
		}	
	}
	ccColor3B CCTileMapAtlas::tileAt(ccGridSize position)
	{
		NSAssert( m_pTGAInfo != NULL, "tgaInfo must not be nil");
		NSAssert( position.x < m_pTGAInfo->width, "Invalid position.x");
		NSAssert( position.y < m_pTGAInfo->height, "Invalid position.y");

		ccColor3B *ptr = (ccColor3B*)m_pTGAInfo->imageData;
		ccColor3B value = ptr[position.x + position.y * m_pTGAInfo->width];

		return value;	
	}
	void CCTileMapAtlas::updateAtlasValueAt(ccGridSize pos, ccColor3B value, int index)
	{
		ccV3F_C4B_T2F_Quad quad;

		int x = pos.x;
		int y = pos.y;
		float row = (value.r % m_nItemsPerRow) * m_fTexStepX;
		float col = (value.r / m_nItemsPerRow) * m_fTexStepY;

		quad.tl.texCoords.u = row;
		quad.tl.texCoords.v = col;
		quad.tr.texCoords.u = row + m_fTexStepX;
		quad.tr.texCoords.v = col;
		quad.bl.texCoords.u = row;
		quad.bl.texCoords.v = col + m_fTexStepY;
		quad.br.texCoords.u = row + m_fTexStepX;
		quad.br.texCoords.v = col + m_fTexStepY;

		quad.bl.vertices.x = (float) (x * m_nItemWidth);
		quad.bl.vertices.y = (float) (y * m_nItemHeight);
		quad.bl.vertices.z = 0.0f;
		quad.br.vertices.x = (float)(x * m_nItemWidth + m_nItemWidth);
		quad.br.vertices.y = (float)(y * m_nItemHeight);
		quad.br.vertices.z = 0.0f;
		quad.tl.vertices.x = (float)(x * m_nItemWidth);
		quad.tl.vertices.y = (float)(y * m_nItemHeight + m_nItemHeight);
		quad.tl.vertices.z = 0.0f;
		quad.tr.vertices.x = (float)(x * m_nItemWidth + m_nItemWidth);
		quad.tr.vertices.y = (float)(y * m_nItemHeight + m_nItemHeight);
		quad.tr.vertices.z = 0.0f;

		m_pTextureAtlas->updateQuad(&quad, index);
	}
	void CCTileMapAtlas::updateAtlasValues()
	{
		NSAssert( m_pTGAInfo != NULL, "tgaInfo must be non-nil");

		int total = 0;

		for(int x=0;x < m_pTGAInfo->width; x++ ) 
		{
			for( int y=0; y < m_pTGAInfo->height; y++ ) 
			{
				if( total < m_nItemsToRender ) 
				{
					ccColor3B *ptr = (ccColor3B*) m_pTGAInfo->imageData;
					ccColor3B value = ptr[x + y * m_pTGAInfo->width];

					if( value.r != 0 )
					{
						this->updateAtlasValueAt(ccg(x,y), value, total);

						char buffer[32];
						std::string key = itoa(x, buffer, 10);
						key += ",";
						key += itoa(y, buffer, 10);
						m_pPosToAtlasIndex->insert(StringToIntegerPair(key, total));

						total++;
					}
				}
			}
		}
	}
	void CCTileMapAtlas::setTGAInfo(tImageTGA* var)
	{
		m_pTGAInfo = var;
	}
	tImageTGA * CCTileMapAtlas::getTGAInfo()
	{
		return m_pTGAInfo;
	}

} // namespace cocos2d