//========================================================================
// GLFW - An OpenGL framework
// Platform:    Cocoa/NSOpenGL
// API Version: 2.7
// WWW:         http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2009-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// 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 <sys/param.h>

#include "internal.h"

@interface GLFWThread : NSThread
@end

@implementation GLFWThread

- (void)main
{
}

@end

//========================================================================
// Change to our application bundle's resources directory, if present
//========================================================================

static void changeToResourcesDirectory( void )
{
    char resourcesPath[MAXPATHLEN];

    CFBundleRef bundle = CFBundleGetMainBundle();
    if( !bundle )
        return;

    CFURLRef resourcesURL = CFBundleCopyResourcesDirectoryURL( bundle );

    CFStringRef last = CFURLCopyLastPathComponent( resourcesURL );
    if( CFStringCompare( CFSTR( "Resources" ), last, 0 ) != kCFCompareEqualTo )
    {
        CFRelease( last );
        CFRelease( resourcesURL );
        return;
    }

    CFRelease( last );

    if( !CFURLGetFileSystemRepresentation( resourcesURL,
                                           true,
                                           (UInt8*) resourcesPath,
                                           MAXPATHLEN) )
    {
        CFRelease( resourcesURL );
        return;
    }

    CFRelease( resourcesURL );

    chdir( resourcesPath );
}


//========================================================================
// Terminate GLFW when exiting application
//========================================================================

static void glfw_atexit( void )
{
    glfwTerminate();
}


//========================================================================
// Initialize GLFW thread package
//========================================================================

static void initThreads( 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;
}


//************************************************************************
//****               Platform implementation functions                ****
//************************************************************************

//========================================================================
// Initialize the GLFW library
//========================================================================

int _glfwPlatformInit( void )
{
    _glfwLibrary.autoreleasePool = [[NSAutoreleasePool alloc] init];

    _glfwLibrary.OpenGLFramework =
        CFBundleGetBundleWithIdentifier( CFSTR( "com.apple.opengl" ) );
    if( _glfwLibrary.OpenGLFramework == NULL )
    {
        return GL_FALSE;
    }

    GLFWThread* thread = [[GLFWThread alloc] init];
    [thread start];
    [thread release];

    changeToResourcesDirectory();

    _glfwPlatformGetDesktopMode( &_glfwLibrary.desktopMode );

    // Install atexit routine
    atexit( glfw_atexit );

    initThreads();

    _glfwInitTimer();

    _glfwInitJoysticks();

    _glfwLibrary.eventSource = CGEventSourceCreate( kCGEventSourceStateHIDSystemState );
    if( !_glfwLibrary.eventSource )
    {
        return GL_FALSE;
    }

    CGEventSourceSetLocalEventsSuppressionInterval( _glfwLibrary.eventSource,
                                                    0.0 );

    _glfwPlatformSetTime( 0.0 );

    return GL_TRUE;
}


//========================================================================
// Close window, if open, and shut down GLFW
//========================================================================

int _glfwPlatformTerminate( void )
{
    if( pthread_self() != _glfwThrd.First.PosixID )
    {
        return GL_FALSE;
    }

    glfwCloseWindow();

    // TODO: Kill all non-main threads?
    // TODO: Probably other cleanup

    if( _glfwLibrary.eventSource )
    {
        CFRelease( _glfwLibrary.eventSource );
        _glfwLibrary.eventSource = NULL;
    }

    _glfwTerminateJoysticks();

    [_glfwLibrary.autoreleasePool release];
    _glfwLibrary.autoreleasePool = nil;

    return GL_TRUE;
}