//========================================================================
// GLFW - An OpenGL framework
// File:        macosx_init.c
// Platform:    Mac OS X
// API Version: 2.6
// WWW:         http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Camilla Berglund
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================

#include "internal.h"

#include <unistd.h>

//========================================================================
// Global variables
//========================================================================

// KCHR resource pointer for keycode translation
void *KCHRPtr;


//========================================================================
// _glfwInitThreads() - Initialize GLFW thread package
//========================================================================

static void _glfwInitThreads( void )
{
    // Initialize critical section handle
    (void) pthread_mutex_init( &_glfwThrd.CriticalSection, NULL );

    // The first thread (the main thread) has ID 0
    _glfwThrd.NextID = 0;

    // Fill out information about the main thread (this thread)
    _glfwThrd.First.ID       = _glfwThrd.NextID ++;
    _glfwThrd.First.Function = NULL;
    _glfwThrd.First.PosixID  = pthread_self();
    _glfwThrd.First.Previous = NULL;
    _glfwThrd.First.Next     = NULL;
}

#define NO_BUNDLE_MESSAGE \
    "Working in unbundled mode.  " \
    "You should build a .app wrapper for your Mac OS X applications.\n"

#define UNBUNDLED \
    fprintf(stderr, NO_BUNDLE_MESSAGE); \
    _glfwLibrary.Unbundled = 1; \
    return

void _glfwChangeToResourcesDirectory( void )
{
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef resourcesURL = CFBundleCopyResourcesDirectoryURL( mainBundle );
    char resourcesPath[ _GLFW_MAX_PATH_LENGTH ];
    
    CFStringRef lastComponent = CFURLCopyLastPathComponent( resourcesURL );
    if ( kCFCompareEqualTo != CFStringCompare(
            CFSTR( "Resources" ),
            lastComponent,
            0 ) )
    {
        UNBUNDLED;
    }
    
    CFRelease( lastComponent );

    if( !CFURLGetFileSystemRepresentation( resourcesURL,
                                           TRUE,
                                           (UInt8*)resourcesPath,
                                           _GLFW_MAX_PATH_LENGTH ) )
    {
        CFRelease( resourcesURL );
        UNBUNDLED;
    }

    CFRelease( resourcesURL );

    if( chdir( resourcesPath ) != 0 )
    {
        UNBUNDLED;
    }
}

int _glfwPlatformInit( void )
{
    struct timeval tv;
    UInt32 nullDummy = 0;

    _glfwWin.MacWindow = NULL;
    _glfwWin.AGLContext = NULL;
    _glfwWin.CGLContext = NULL;
    _glfwWin.WindowFunctions = NULL;
    _glfwWin.MouseUPP = NULL;
    _glfwWin.CommandUPP = NULL;
    _glfwWin.KeyboardUPP = NULL;
    _glfwWin.WindowUPP = NULL;
    
    _glfwInput.Modifiers = 0;
    
    _glfwLibrary.Unbundled = 0;
    
    _glfwLibrary.Libs.OpenGLFramework
        = CFBundleGetBundleWithIdentifier( CFSTR( "com.apple.opengl" ) );
    if( _glfwLibrary.Libs.OpenGLFramework == NULL )
    {
        fprintf(
            stderr,
            "glfwInit failing because you aren't linked to OpenGL\n" );
        return GL_FALSE;
    }

    _glfwDesktopVideoMode = CGDisplayCurrentMode( kCGDirectMainDisplay );
    if( _glfwDesktopVideoMode == NULL )
    {
        fprintf(
            stderr,
            "glfwInit failing because it kind find the desktop display mode\n" );
        return GL_FALSE;
    }

    _glfwInitThreads();

    _glfwChangeToResourcesDirectory();

    if( !_glfwInstallEventHandlers() )
    {
    	fprintf(
            stderr,
            "glfwInit failing because it can't install event handlers\n" );
        _glfwPlatformTerminate();
        return GL_FALSE;
    }

    // Ugly hack to reduce the nasty jump that occurs at the first non-
    // sys keypress, caused by OS X loading certain meta scripts used
    // for lexical- and raw keycode translation - instead of letting
    // this happen while our application is running, we do some blunt
    // function calls in advance just to get the script caching out of
    // the way BEFORE our window/screen is opened. These calls might
    // generate err return codes, but we don't care in this case.
    // NOTE: KCHRPtr is declared globally, because we need it later on.
    KCHRPtr = (void *)GetScriptVariable( smCurrentScript, smKCHRCache );
    KeyTranslate( KCHRPtr, 0, &nullDummy );
    UppercaseText( (char *)&nullDummy, 0, smSystemScript );

    gettimeofday( &tv, NULL );
    _glfwLibrary.Timer.t0 = tv.tv_sec + (double) tv.tv_usec / 1000000.0;

    return GL_TRUE;
}

int _glfwPlatformTerminate( void )
{
    if( _glfwWin.MouseUPP != NULL )
    {
        DisposeEventHandlerUPP( _glfwWin.MouseUPP );
        _glfwWin.MouseUPP = NULL;
    }
    if( _glfwWin.CommandUPP != NULL )
    {
        DisposeEventHandlerUPP( _glfwWin.CommandUPP );
        _glfwWin.CommandUPP = NULL;
    }
    if( _glfwWin.KeyboardUPP != NULL )
    {
        DisposeEventHandlerUPP( _glfwWin.KeyboardUPP );
        _glfwWin.KeyboardUPP = NULL;
    }
    
    return GL_TRUE;
}