/*
 * Copyright 2011-2014 Branimir Karadzic. All rights reserved.
 * License: http://www.opensource.org/licenses/BSD-2-Clause
 */

#include "entry_p.h"

#if ENTRY_CONFIG_USE_NATIVE && BX_PLATFORM_OSX

#import <Cocoa/Cocoa.h>

#include <bgfxplatform.h>

#include <bx/uint32_t.h>
#include <bx/thread.h>
#include <bx/os.h>

#define DEFAULT_WIDTH 1280
#define DEFAULT_HEIGHT 720

@interface AppDelegate : NSObject<NSApplicationDelegate>
{
	bool terminated;
}

+ (AppDelegate *)sharedDelegate;
- (id)init;
- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender;
- (bool)applicationHasTerminated;

@end

@implementation AppDelegate

+ (AppDelegate *)sharedDelegate
{
	static id delegate = [AppDelegate new];
	return delegate;
}

- (id)init
{
	self = [super init];

	if (nil == self)
	{
		return nil;
	}

	self->terminated = false;
	return self;
}

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
	BX_UNUSED(sender);
	self->terminated = true;
	return NSTerminateCancel;
}

- (bool)applicationHasTerminated
{
	return self->terminated;
}

@end

@interface Window : NSObject<NSWindowDelegate>
{
	unsigned int windowCount;
}

+ (Window *)sharedDelegate;
- (id)init;
- (void)windowCreated:(NSWindow *)window;
- (BOOL)windowShouldClose:(NSWindow *)window;

@end

@implementation Window

+ (Window *)sharedDelegate
{
	static id windowDelegate = [Window new];
	return windowDelegate;
}

- (id)init
{
	self = [super init];
	if (nil == self)
	{
		return nil;
	}

	self->windowCount = 0;
	return self;
}

- (void)windowCreated:(NSWindow *)window
{
	assert(window);

	[window setDelegate:self];

	assert(self->windowCount < ~0u);
	self->windowCount += 1;
}

- (BOOL)windowShouldClose:(NSWindow *)window
{
	assert(window);

	[window setDelegate:nil];

	assert(self->windowCount);
	self->windowCount -= 1;

	if (self->windowCount == 0)
	{
		[NSApp terminate:self];
		return false;
	}

	return true;
}
@end

namespace entry
{
	struct MainThreadEntry
	{
		int m_argc;
		char** m_argv;

		static int32_t threadFunc(void* _userData)
		{
			MainThreadEntry* self = (MainThreadEntry*)_userData;
			return main(self->m_argc, self->m_argv);
		}
	};

	struct Context
	{
		Context()
			: m_exit(false)
		{
		}

		NSEvent* WaitEvent()
		{
			return [NSApp
				nextEventMatchingMask:NSAnyEventMask
				untilDate:[NSDate distantFuture] // wait for event
				inMode:NSDefaultRunLoopMode
				dequeue:YES
				];
		}

		NSEvent* PeekEvent()
		{
			return [NSApp
				nextEventMatchingMask:NSAnyEventMask
				untilDate:[NSDate distantPast] // do not wait for event
				inMode:NSDefaultRunLoopMode
				dequeue:YES
				];
		}

		bool DispatchEvent(NSEvent* event)
		{
			if (event)
			{
				[NSApp sendEvent:event];
				[NSApp updateWindows];
				return true;
			}

			return false;
		}

		int32_t run(int _argc, char** _argv)
		{
			[NSApplication sharedApplication];

			id dg = [AppDelegate sharedDelegate];
			[NSApp setDelegate:dg];
			[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
			[NSApp activateIgnoringOtherApps:YES];
			[NSApp finishLaunching];

			[[NSNotificationCenter defaultCenter]
				postNotificationName:NSApplicationWillFinishLaunchingNotification
				object:NSApp];

			[[NSNotificationCenter defaultCenter]
				postNotificationName:NSApplicationDidFinishLaunchingNotification
				object:NSApp];

			id quitMenuItem = [NSMenuItem new];
			[quitMenuItem
				initWithTitle:@"Quit"
				action:@selector(terminate:)
				keyEquivalent:@"q"];

			id appMenu = [NSMenu new];
			[appMenu addItem:quitMenuItem];

			id appMenuItem = [NSMenuItem new];
			[appMenuItem setSubmenu:appMenu];

			id menubar = [[NSMenu new] autorelease];
			[menubar addItem:appMenuItem];
			[NSApp setMainMenu:menubar];

			NSRect rect = NSMakeRect(0, 0, DEFAULT_WIDTH, DEFAULT_HEIGHT);
			NSWindow* window = [NSWindow alloc];
			[window
				initWithContentRect:rect
				styleMask:0
				|NSTitledWindowMask
				|NSClosableWindowMask
				|NSMiniaturizableWindowMask
				|NSResizableWindowMask
				backing:NSBackingStoreBuffered defer:NO
				];
			NSString* appName = [[NSProcessInfo processInfo] processName];
			[window setTitle:appName];
			[window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
			[window makeKeyAndOrderFront:window];
			[window setContentView:nil];
			[[Window sharedDelegate] windowCreated:window];

			bgfx::osxSetNSWindow(window);

			MainThreadEntry mte;
			mte.m_argc = _argc;
			mte.m_argv = _argv;

			bx::Thread thread;
			thread.init(mte.threadFunc, &mte);

			while (!(m_exit = [dg applicationHasTerminated]) )
			{
				//DispatchEvent(WaitEvent() );
				if (bgfx::RenderFrame::Exiting == bgfx::renderFrame() )
				{
					break;
				}
				while (DispatchEvent(PeekEvent() ) ) {};
			}


			m_eventQueue.postExitEvent();

			while (bgfx::RenderFrame::NoContext != bgfx::renderFrame() ) {};
			thread.shutdown();

			return 0;
		}

		EventQueue m_eventQueue;

		bool m_exit;
	};

	static Context s_ctx;

	const Event* poll()
	{
		return s_ctx.m_eventQueue.poll();
	}

	void release(const Event* _event)
	{
		s_ctx.m_eventQueue.release(_event);
	}

	void setWindowSize(WindowHandle _handle, uint32_t _width, uint32_t _height)
	{
		BX_UNUSED(_handle, _width, _height);
	}

	void setWindowTitle(WindowHandle _handle, const char* _title)
	{
		BX_UNUSED(_handle, _title);
	}

	void toggleWindowFrame(WindowHandle _handle)
	{
		BX_UNUSED(_handle);
	}

	void setMouseLock(WindowHandle _handle, bool _lock)
	{
		BX_UNUSED(_handle, _lock);
	}

} // namespace entry

int main(int _argc, char** _argv)
{
	using namespace entry;
	return s_ctx.run(_argc, _argv);
}

#endif // BX_PLATFORM_OSX