//========================================================================
// 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.
//
//========================================================================

// Needed for _NSGetProgname
#include <crt_externs.h>

#include "internal.h"

@interface GLFWThread : NSThread
@end

@implementation GLFWThread

- (void)main
{
}

@end

@interface GLFWApplication : NSApplication
@end

@implementation GLFWApplication

// From http://cocoadev.com/index.pl?GameKeyboardHandlingAlmost
// This works around an AppKit bug, where key up events while holding
// down the command key don't get sent to the key window.
- (void)sendEvent:(NSEvent *)event
{
    if( [event type] == NSKeyUp && ( [event modifierFlags] & NSCommandKeyMask ) )
    {
        [[self keyWindow] sendEvent:event];
    }
    else
    {
        [super sendEvent:event];
    }
}

@end

// Prior to Snow Leopard, we need to use this oddly-named semi-private API
// to get the application menu working properly.  Need to be careful in
// case it goes away in a future OS update.
@interface NSApplication (NSAppleMenu)
- (void)setAppleMenu:(NSMenu *)m;
@end

// Keys to search for as potential application names
NSString *GLFWNameKeys[] =
{
    @"CFBundleDisplayName",
    @"CFBundleName",
    @"CFBundleExecutable",
};

//========================================================================
// Try to figure out what the calling application is called
//========================================================================
static NSString *findAppName( void )
{
    NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

    unsigned int i;
    for( i = 0; i < sizeof(GLFWNameKeys) / sizeof(GLFWNameKeys[0]); i++ )
    {
        id name = [infoDictionary objectForKey:GLFWNameKeys[i]];
        if (name &&
            [name isKindOfClass:[NSString class]] &&
            ![@"" isEqualToString:name])
        {
            return name;
        }
    }

    // If we get here, we're unbundled
    if( !_glfwLibrary.Unbundled )
    {
        // Could do this only if we discover we're unbundled, but it should
        // do no harm...
        ProcessSerialNumber psn = { 0, kCurrentProcess };
        TransformProcessType( &psn, kProcessTransformToForegroundApplication );

        // Having the app in front of the terminal window is also generally
        // handy.  There is an NSApplication API to do this, but...
        SetFrontProcess( &psn );

        _glfwLibrary.Unbundled = GL_TRUE;
    }

    char **progname = _NSGetProgname();
    if( progname && *progname )
    {
        // TODO: UTF8?
        return [NSString stringWithUTF8String:*progname];
    }

    // Really shouldn't get here
    return @"GLFW Application";
}

//========================================================================
// Set up the menu bar (manually)
// This is nasty, nasty stuff -- calls to undocumented semi-private APIs that
// could go away at any moment, lots of stuff that really should be
// localize(d|able), etc.  Loading a nib would save us this horror, but that
// doesn't seem like a good thing to require of GLFW's clients.
//========================================================================
static void setUpMenuBar( void )
{
    NSString *appName = findAppName();

    NSMenu *bar = [[NSMenu alloc] init];
    [NSApp setMainMenu:bar];

    NSMenuItem *appMenuItem =
        [bar addItemWithTitle:@"" action:NULL keyEquivalent:@""];
    NSMenu *appMenu = [[NSMenu alloc] init];
    [appMenuItem setSubmenu:appMenu];

    [appMenu addItemWithTitle:[NSString stringWithFormat:@"About %@", appName]
                       action:@selector(orderFrontStandardAboutPanel:)
                keyEquivalent:@""];
    [appMenu addItem:[NSMenuItem separatorItem]];
    NSMenu *servicesMenu = [[NSMenu alloc] init];
    [NSApp setServicesMenu:servicesMenu];
    [[appMenu addItemWithTitle:@"Services"
                       action:NULL
                keyEquivalent:@""] setSubmenu:servicesMenu];
    [appMenu addItem:[NSMenuItem separatorItem]];
    [appMenu addItemWithTitle:[NSString stringWithFormat:@"Hide %@", appName]
                       action:@selector(hide:)
                keyEquivalent:@"h"];
    [[appMenu addItemWithTitle:@"Hide Others"
                       action:@selector(hideOtherApplications:)
                keyEquivalent:@"h"]
        setKeyEquivalentModifierMask:NSAlternateKeyMask | NSCommandKeyMask];
    [appMenu addItemWithTitle:@"Show All"
                       action:@selector(unhideAllApplications:)
                keyEquivalent:@""];
    [appMenu addItem:[NSMenuItem separatorItem]];
    [appMenu addItemWithTitle:[NSString stringWithFormat:@"Quit %@", appName]
                       action:@selector(terminate:)
                keyEquivalent:@"q"];

    NSMenuItem *windowMenuItem =
        [bar addItemWithTitle:@"" action:NULL keyEquivalent:@""];
    NSMenu *windowMenu = [[NSMenu alloc] initWithTitle:@"Window"];
    [NSApp setWindowsMenu:windowMenu];
    [windowMenuItem setSubmenu:windowMenu];

    [windowMenu addItemWithTitle:@"Miniaturize"
                          action:@selector(performMiniaturize:)
                   keyEquivalent:@"m"];
    [windowMenu addItemWithTitle:@"Zoom"
                          action:@selector(performZoom:)
                   keyEquivalent:@""];
    [windowMenu addItem:[NSMenuItem separatorItem]];
    [windowMenu addItemWithTitle:@"Bring All to Front"
                          action:@selector(arrangeInFront:)
                   keyEquivalent:@""];

    // At least guard the call to private API to avoid an exception if it
    // goes away.  Hopefully that means the worst we'll break in future is to
    // look ugly...
    if( [NSApp respondsToSelector:@selector(setAppleMenu:)] )
    {
        [NSApp setAppleMenu:appMenu];
    }
}

//========================================================================
// 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];

    // Implicitly create shared NSApplication instance
    [GLFWApplication sharedApplication];

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

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

    NSString* resourcePath = [[NSBundle mainBundle] resourcePath];

    if( access( [resourcePath cStringUsingEncoding:NSUTF8StringEncoding], R_OK ) == 0 )
    {
        chdir( [resourcePath cStringUsingEncoding:NSUTF8StringEncoding] );
    }

    // Setting up menu bar must go exactly here else weirdness ensues
    setUpMenuBar();

    [NSApp finishLaunching];

    // Install atexit routine
    atexit( glfw_atexit );

    initThreads();

    _glfwPlatformSetTime( 0.0 );

    _glfwLibrary.DesktopMode =
	(NSDictionary *)CGDisplayCurrentMode( CGMainDisplayID() );

    return GL_TRUE;
}

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

int _glfwPlatformTerminate( void )
{
    // TODO: Fail unless this is the main thread

    glfwCloseWindow();

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

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

    return GL_TRUE;
}