/*-------------------------------------------------------------------------
This source file is a part of OGRE
(Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2013 Torus Knot Software Ltd
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
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE
-------------------------------------------------------------------------*/

#include "OgreFontManager.h"
#include "OgreLogManager.h"
#include "OgreStringConverter.h"
#include "OgreStringVector.h"
#include "OgreException.h"
#include "OgreResourceGroupManager.h"

namespace Ogre
{
    //---------------------------------------------------------------------
    template<> FontManager * Singleton< FontManager >::msSingleton = 0;
    FontManager* FontManager::getSingletonPtr(void)
    {
        return msSingleton;
    }
    FontManager& FontManager::getSingleton(void)
    {  
        assert( msSingleton );  return ( *msSingleton );  
    }
    //---------------------------------------------------------------------
	FontManager::FontManager() : ResourceManager()
	{
        // Loading order
        mLoadOrder = 200.0f;
		// Scripting is supported by this manager
		mScriptPatterns.push_back("*.fontdef");
		// Register scripting with resource group manager
		ResourceGroupManager::getSingleton()._registerScriptLoader(this);

		// Resource type
		mResourceType = "Font";

		// Register with resource group manager
		ResourceGroupManager::getSingleton()._registerResourceManager(mResourceType, this);


	}
	//---------------------------------------------------------------------
	FontManager::~FontManager()
	{
		// Unregister with resource group manager
		ResourceGroupManager::getSingleton()._unregisterResourceManager(mResourceType);
		// Unegister scripting with resource group manager
		ResourceGroupManager::getSingleton()._unregisterScriptLoader(this);

	}
	//---------------------------------------------------------------------
	Resource* FontManager::createImpl(const String& name, ResourceHandle handle, 
		const String& group, bool isManual, ManualResourceLoader* loader,
        const NameValuePairList* params)
	{
		return OGRE_NEW Font(this, name, handle, group, isManual, loader);
	}
	//-----------------------------------------------------------------------
	FontPtr FontManager::getByName(const String& name, const String& groupName)
	{
		return getResourceByName(name, groupName).staticCast<Font>();
	}
	//---------------------------------------------------------------------
	FontPtr FontManager::create (const String& name, const String& group,
									bool isManual, ManualResourceLoader* loader,
									const NameValuePairList* createParams)
	{
		return createResource(name,group,isManual,loader,createParams).staticCast<Font>();
	}
	//---------------------------------------------------------------------
    void FontManager::parseScript(DataStreamPtr& stream, const String& groupName)
    {
        String line;
        FontPtr pFont;

        while( !stream->eof() )
        {
            line = stream->getLine();
            // Ignore blanks & comments
            if( !line.length() || line.substr( 0, 2 ) == "//" )
            {
                continue;
            }
            else
            {
			    if (pFont.isNull())
			    {
				    // No current font
				    // So first valid data should be font name
					if (StringUtil::startsWith(line, "font "))
					{
						// chop off the 'particle_system ' needed by new compilers
						line = line.substr(5);
					}
					pFont = create(line, groupName);
					pFont->_notifyOrigin(stream->getName());
				    // Skip to and over next {
                    stream->skipLine("{");
			    }
			    else
			    {
				    // Already in font
				    if (line == "}")
				    {
					    // Finished 
					    pFont.setNull();
                        // NB font isn't loaded until required
				    }
                    else
                    {
                        parseAttribute(line, pFont);
                    }
                }
            }
        }
    }
    //---------------------------------------------------------------------
    void FontManager::parseAttribute(const String& line, FontPtr& pFont)
    {
        vector<String>::type params = StringUtil::split(line);
        String& attrib = params[0];
		StringUtil::toLowerCase(attrib);
        if (attrib == "type")
        {
            // Check params
            if (params.size() != 2)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
			StringUtil::toLowerCase(params[1]);
            if (params[1] == "truetype")
            {
                pFont->setType(FT_TRUETYPE);
            }
            else
            {
                pFont->setType(FT_IMAGE);
            }

        }
        else if (attrib == "source")
        {
            // Check params
            if (params.size() != 2)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
            pFont->setSource(params[1]);
        }
        else if (attrib == "glyph")
        {
            // Check params
            if (params.size() != 6)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
			// Support numeric and character glyph specification
			Font::CodePoint cp;
			if (params[1].at(0) == 'u' && params[1].size() > 1)
			{
				// Unicode glyph spec
				String trimmed = params[1].substr(1);
				cp = StringConverter::parseUnsignedInt(trimmed);
			}
			else
			{
				// Direct character
				cp = params[1].at(0);
			}
            pFont->setGlyphTexCoords(
                cp, 
                StringConverter::parseReal(params[2]),
                StringConverter::parseReal(params[3]),
                StringConverter::parseReal(params[4]),
                StringConverter::parseReal(params[5]), 1.0 ); // assume image is square
        }
        else if (attrib == "size")
        {
            // Check params
            if (params.size() != 2)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
            pFont->setTrueTypeSize(
                StringConverter::parseReal(params[1]));
        }
        else if (attrib == "character_spacer")
        {
            // Check params
            if (params.size() != 2)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
            pFont->setCharacterSpacer(
                StringConverter::parseUnsignedInt(params[1]));
        }
        else if (attrib == "resolution")
        {
            // Check params
            if (params.size() != 2)
            {
                logBadAttrib(line, pFont);
                return;
            }
            // Set
            pFont->setTrueTypeResolution(
                (uint)StringConverter::parseReal(params[1]) );
        }
        else if (attrib == "antialias_colour")
        {
        	// Check params
        	if (params.size() != 2)
        	{
                logBadAttrib(line, pFont);
                return;
        	}
        	// Set
            pFont->setAntialiasColour(StringConverter::parseBool(params[1]));
        }
		else if (attrib == "code_points")
		{
			for (size_t c = 1; c < params.size(); ++c)
			{
				String& item = params[c];
				StringVector itemVec = StringUtil::split(item, "-");
				if (itemVec.size() == 2)
				{
					pFont->addCodePointRange(Font::CodePointRange(
						StringConverter::parseUnsignedInt(itemVec[0]),
						StringConverter::parseUnsignedInt(itemVec[1])));
				}
			}
		}

    }
    //---------------------------------------------------------------------
    void FontManager::logBadAttrib(const String& line, FontPtr& pFont)
    {
        LogManager::getSingleton().logMessage("Bad attribute line: " + line +
            " in font " + pFont->getName(), LML_CRITICAL);

    }

}
