/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/
 
Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
 
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/

#include "OgreException.h"
#include "OgreLogManager.h"
#include "OgreStringConverter.h"
#include "OgreRoot.h"

#include "OgreOSXGLSupport.h"
#include "OgreOSXCarbonWindow.h"
#include "OgreOSXCocoaWindow.h"

#include "OgreGLTexture.h"
#include "OgreOSXRenderTexture.h"

#include <OpenGL/OpenGL.h>
#include <mach-o/dyld.h>

namespace Ogre {

OSXGLSupport::OSXGLSupport() : mAPI(""), mContextType("")
{
}

OSXGLSupport::~OSXGLSupport()
{
}

void OSXGLSupport::addConfig( void )
{
	ConfigOption optFullScreen;
	ConfigOption optVideoMode;
	ConfigOption optBitDepth;
    ConfigOption optFSAA;
	ConfigOption optRTTMode;

	// FS setting possiblities
	optFullScreen.name = "Full Screen";
	optFullScreen.possibleValues.push_back( "Yes" );
	optFullScreen.possibleValues.push_back( "No" );
	optFullScreen.currentValue = "No";
	optFullScreen.immutable = false;

	optBitDepth.name = "Colour Depth";
	optBitDepth.possibleValues.push_back( "32" );
	optBitDepth.possibleValues.push_back( "16" );
	optBitDepth.currentValue = "32";
	optBitDepth.immutable = false;

    mOptions[ optFullScreen.name ] = optFullScreen;
	mOptions[ optBitDepth.name ] = optBitDepth;

	CGLRendererInfoObj rend;
	long nrend;
	CGLQueryRendererInfo(CGDisplayIDToOpenGLDisplayMask(kCGDirectMainDisplay), &rend, &nrend);

	long maxSamples;
	CGLDescribeRenderer(rend, 0, kCGLRPMaxSamples, &maxSamples);

    //FSAA possibilities
    optFSAA.name = "FSAA";
    optFSAA.possibleValues.push_back( "0" );

	switch( maxSamples )
	{
		case 6:
			optFSAA.possibleValues.push_back( "2" );
			optFSAA.possibleValues.push_back( "4" );
			optFSAA.possibleValues.push_back( "6" );
			break;
		case 4:
			optFSAA.possibleValues.push_back( "2" );
			optFSAA.possibleValues.push_back( "4" );
			break;
		case 2:
			optFSAA.possibleValues.push_back( "2" );
			break;
		default: break;
	}

    optFSAA.currentValue = "0";
    optFSAA.immutable = false;

    mOptions[ optFSAA.name ] = optFSAA;

	// Video mode possiblities
	optVideoMode.name = "Video Mode";
	optVideoMode.immutable = false;

	CFArrayRef displayModes = CGDisplayAvailableModes(CGMainDisplayID());
	CFIndex numModes = CFArrayGetCount(displayModes);
	CFMutableArrayRef goodModes = NULL;
	goodModes = CFArrayCreateMutable(kCFAllocatorDefault, numModes, NULL);
	
	// Grab all the available display modes, then weed out duplicates...
	for(int i = 0; i < numModes; ++i)
	{
		CFDictionaryRef modeInfo = (CFDictionaryRef)CFArrayGetValueAtIndex(displayModes, i);
		
		Boolean safeForHardware = _getDictionaryBoolean(modeInfo, kCGDisplayModeIsSafeForHardware);
		Boolean stretched = _getDictionaryBoolean(modeInfo, kCGDisplayModeIsStretched);
		Boolean skipped = false;
		
		if((safeForHardware) || (!stretched))
		{
			long width  = _getDictionaryLong(modeInfo, kCGDisplayWidth);
			long height = _getDictionaryLong(modeInfo, kCGDisplayHeight); 
			
			for(int j = 0; j < CFArrayGetCount(goodModes); ++j)
			{
				CFDictionaryRef otherMode = (CFDictionaryRef)CFArrayGetValueAtIndex(goodModes, j);

				long otherWidth  = _getDictionaryLong(otherMode, kCGDisplayWidth);
				long otherHeight = _getDictionaryLong(otherMode, kCGDisplayHeight);
				
				// If we find a duplicate then skip this mode
				if((otherWidth == width) && (otherHeight == height))
					skipped = true;
			}
			
			// This is a new mode, so add it to our goodModes array
			if(!skipped)
				CFArrayAppendValue(goodModes, modeInfo);
		}
	}
	
	// Sort the modes...
	CFArraySortValues(goodModes, CFRangeMake(0, CFArrayGetCount(goodModes)), 
					  (CFComparatorFunction)_compareModes, NULL);
					  
	// Now pull the modes out and put them into optVideoModes
	for(int i = 0; i < CFArrayGetCount(goodModes); ++i)
	{
		CFDictionaryRef resolution = (CFDictionaryRef)CFArrayGetValueAtIndex(goodModes, i);
		
		long fWidth  = _getDictionaryLong(resolution, kCGDisplayWidth);
		long fHeight = _getDictionaryLong(resolution, kCGDisplayHeight);
		
		String resoString = StringConverter::toString(fWidth) + " x " + StringConverter::toString(fHeight);
		optVideoMode.possibleValues.push_back(resoString);
		
		//LogManager::getSingleton().logMessage( "Added resolution: " + resoString);
	}
	
	optRTTMode.name = "RTT Preferred Mode";
	optRTTMode.possibleValues.push_back( "FBO" );
	optRTTMode.possibleValues.push_back( "PBuffer" );
	optRTTMode.possibleValues.push_back( "Copy" );
	optRTTMode.currentValue = "PBuffer";
	optRTTMode.immutable = false;


	mOptions[optFullScreen.name] = optFullScreen;
	mOptions[optVideoMode.name] = optVideoMode;
    mOptions[optFSAA.name] = optFSAA;
	mOptions[optRTTMode.name] = optRTTMode;

}

String OSXGLSupport::validateConfig( void )
{
	return String( "" );
}

RenderWindow* OSXGLSupport::createWindow( bool autoCreateWindow, GLRenderSystem* renderSystem, const String& windowTitle ) 
{
	if( autoCreateWindow )
	{
		ConfigOptionMap::iterator opt = mOptions.find( "Full Screen" );
		if( opt == mOptions.end() )
			OGRE_EXCEPT( Exception::ERR_RENDERINGAPI_ERROR, "Can't find full screen options!", "OSXGLSupport::createWindow" );
		bool fullscreen = ( opt->second.currentValue == "Yes" );

		opt = mOptions.find( "Video Mode" );
		if( opt == mOptions.end() )
			OGRE_EXCEPT( Exception::ERR_RENDERINGAPI_ERROR, "Can't find video mode options!", "OSXGLSupport::createWindow" );
		String val = opt->second.currentValue;
		String::size_type pos = val.find( 'x' );
		if( pos == String::npos )
			OGRE_EXCEPT( Exception::ERR_RENDERINGAPI_ERROR, "Invalid Video Mode provided", "OSXGLSupport::createWindow" );

		unsigned int w = StringConverter::parseUnsignedInt( val.substr( 0, pos ) );
		unsigned int h = StringConverter::parseUnsignedInt( val.substr( pos + 1 ) );

        // Parse FSAA config
		NameValuePairList winOptions;
		winOptions[ "title" ] = windowTitle;
        int fsaa_x_samples = 0;
        opt = mOptions.find( "FSAA" );
        if( opt != mOptions.end() )
        {
			winOptions[ "FSAA" ] = opt->second.currentValue;
        }

		return renderSystem->createRenderWindow( windowTitle, w, h, fullscreen, &winOptions );
	}
	else
	{
		// XXX What is the else?
		return NULL;
	}
}

RenderWindow* OSXGLSupport::newWindow( const String &name, unsigned int width, unsigned int height, 
	bool fullScreen, const NameValuePairList *miscParams )
{
	//  Does the user want Cocoa or Carbon, default to carbon...
	mAPI = "carbon";
	mContextType = "AGL";
	
	if(miscParams)
	{
		NameValuePairList::const_iterator opt = NULL;
		
		// First we must determine if this is a carbon or a cocoa window
		// that we wish to create
		opt = miscParams->find("macAPI");
		if(opt != miscParams->end() && opt->second == "cocoa")
		{
			// Our user wants a cocoa compatable system
			mAPI = "cocoa";
			mContextType = "NSOpenGL";
		}
	}
	
	// Create the window, if cocoa return a cocoa window
	if(mAPI == "cocoa")
	{
		LogManager::getSingleton().logMessage("Creating a Cocoa Compatible Render System");
		OSXCocoaWindow* window = new OSXCocoaWindow();
		window->create(name, width, height, fullScreen, miscParams);
		return window;
	}
	
	// Otherwise default to carbon
	LogManager::getSingleton().logMessage("Creating a Carbon Compatible Render System");
	OSXCarbonWindow* window = new OSXCarbonWindow();
	window->create(name, width, height, fullScreen, miscParams);
	return window;
}

void OSXGLSupport::start()
{
	LogManager::getSingleton().logMessage(
			"*******************************************\n"
			"***    Starting OSX OpenGL Subsystem    ***\n"
			"*******************************************");
}

void OSXGLSupport::stop()
{
	LogManager::getSingleton().logMessage(
			"*******************************************\n"
			"***    Stopping OSX OpenGL Subsystem    ***\n"
			"*******************************************");
}

void* OSXGLSupport::getProcAddress( const char* name )
{
	NSSymbol symbol;
    char *symbolName;
    // Prepend a '_' for the Unix C symbol mangling convention
    symbolName = (char*)malloc (strlen (name) + 2);
    strcpy(symbolName + 1, name);
    symbolName[0] = '_';
    symbol = NULL;
	// TODO:  dlopen calls, dyld
    if (NSIsSymbolNameDefined (symbolName))
        symbol = NSLookupAndBindSymbol (symbolName);
    free (symbolName);
    return symbol ? NSAddressOfSymbol (symbol) : NULL;
}

void* OSXGLSupport::getProcAddress( const String& procname )
{
	return getProcAddress( procname.c_str() );
}

bool OSXGLSupport::supportsPBuffers()
{
	return true;
}

GLPBuffer* OSXGLSupport::createPBuffer(PixelComponentType format, size_t width, size_t height)
{
//	if(mContextType == "NSOpenGL")
//		return new OSXCocoaPBuffer(format, width, height);
//	if(mContextType == "CGL")
//		return new OSXCGLPBuffer(format, width, height);
//	else
		return new OSXPBuffer(format, width, height);
}

CFComparisonResult OSXGLSupport::_compareModes (const void *val1, const void *val2, void *context)
{
	// These are the values we will be interested in...
	/*
	_getDictionaryLong((mode), kCGDisplayWidth)
	_getDictionaryLong((mode), kCGDisplayHeight)
	_getDictionaryLong((mode), kCGDisplayRefreshRate)
	_getDictionaryLong((mode), kCGDisplayBitsPerPixel)
	_getDictionaryBoolean((mode), kCGDisplayModeIsSafeForHardware)
	_getDictionaryBoolean((mode), kCGDisplayModeIsStretched)
	*/
	
	// CFArray comparison callback for sorting display modes.
	#pragma unused(context)
	CFDictionaryRef thisMode = (CFDictionaryRef)val1;
	CFDictionaryRef otherMode = (CFDictionaryRef)val2;
	
	long width = _getDictionaryLong(thisMode, kCGDisplayWidth);
	long otherWidth = _getDictionaryLong(otherMode, kCGDisplayWidth);
	
	long height = _getDictionaryLong(thisMode, kCGDisplayHeight);
	long otherHeight = _getDictionaryLong(otherMode, kCGDisplayHeight);

	// sort modes in screen size order
	if (width * height < otherWidth * otherHeight)
	{
		return kCFCompareLessThan;
	}
	else if (width * height > otherWidth * otherHeight)
	{
		return kCFCompareGreaterThan;
	}

	// sort modes by bits per pixel
	long bitsPerPixel = _getDictionaryLong(thisMode, kCGDisplayBitsPerPixel);
	long otherBitsPerPixel = _getDictionaryLong(otherMode, kCGDisplayBitsPerPixel);

	if (bitsPerPixel < otherBitsPerPixel)
	{
		return kCFCompareLessThan;
	}
	else if (bitsPerPixel > otherBitsPerPixel)
	{
		return kCFCompareGreaterThan;
	}

	// sort modes by refresh rate.
	long refreshRate = _getDictionaryLong(thisMode, kCGDisplayRefreshRate);
	long otherRefreshRate = _getDictionaryLong(otherMode, kCGDisplayRefreshRate);

	if (refreshRate < otherRefreshRate)
	{
		return kCFCompareLessThan;
	}
	else if (refreshRate > otherRefreshRate)
	{
		return kCFCompareGreaterThan;
	}

	return kCFCompareEqualTo;
}

Boolean OSXGLSupport::_getDictionaryBoolean(CFDictionaryRef dict, const void* key)
{
	Boolean value = false;
	CFBooleanRef boolRef;
	boolRef = (CFBooleanRef)CFDictionaryGetValue(dict, key);
	
	if (boolRef != NULL)
		value = CFBooleanGetValue(boolRef); 	
		
	return value;
}

long OSXGLSupport::_getDictionaryLong(CFDictionaryRef dict, const void* key)
{
	long value = 0;
	CFNumberRef numRef;
	numRef = (CFNumberRef)CFDictionaryGetValue(dict, key);
	
	if (numRef != NULL)
		CFNumberGetValue(numRef, kCFNumberLongType, &value);	
		
	return value;
}


}