#include "fgui/fgui.h"
#include "input.h"
#include "mainmenu.h"
#include "networking.h"
#include "tier0/network.h"
#include "tier0/platform.h"
#include "tier1/commandline.h"
#include "tier1/utlstring.h"
#include "tier0/lib.h"
#include "console.h"
#include "filesystem.h"
#include "rendering.h"
#include "engine.h"
#include "baseentity.h"
#include "server.h"
#include "physics.h"
#include "signal.h"
#include "steam/steam_api.h"
#include "steam/isteamgameserver.h"
#include "steam/steam_gameserver.h"
#include "networking.h"

double fPrev = 0;
double fCurrent = 0;

funnyphysics *px;

IIClient *g_localClient;

CUtlVector<IIClient*> g_clients = {};

//-----------------------------------------------------------------------------
// Purpose: Engine entry point
//-----------------------------------------------------------------------------
extern "C" void FunnyMain( int argc, char **argv ) {
	
	ICommandLine::CreateCommandLine(argc, argv);
	IEngine::Init();
	for (;;)
	{
		fPrev = fCurrent;
		fCurrent = Plat_GetTime();
		IEngine::Frame(fCurrent-fPrev);
	};
	/* deinit is handled explicitly */
};

//-----------------------------------------------------------------------------
// Purpose: Recieves signals from the system
//-----------------------------------------------------------------------------
void IEngine_Signal(int sig)
{
	printf("Trapped signal %i\n",sig);
	switch (sig)
	{
	case SIGSEGV:
	case SIGILL:
	case SIGABRT:
		printf("Consider running app with debugger attached\n");
		Plat_Backtrace();
		break;
	default:
		break;
	};
	IEngine::Shutdown();
	Plat_Exit(0);
};

//-----------------------------------------------------------------------------
// Purpose: Initializes engine
//-----------------------------------------------------------------------------
void IEngine::Init()
{
	/* trap signals */
	#ifdef __linux__
	signal(SIGHUP, IEngine_Signal);
	signal(SIGINT, IEngine_Signal);
	signal(SIGQUIT, IEngine_Signal);
	signal(SIGILL, IEngine_Signal);
	signal(SIGTRAP, IEngine_Signal);
	signal(SIGIOT, IEngine_Signal);
	signal(SIGBUS, IEngine_Signal);
	signal(SIGFPE, IEngine_Signal);
	signal(SIGSEGV, IEngine_Signal);
	signal(SIGTERM, IEngine_Signal);
	#endif
	#ifdef __WIN32__
	signal(SIGINT, IEngine_Signal);
	signal(SIGILL, IEngine_Signal);
	signal(SIGFPE, IEngine_Signal);
	signal(SIGSEGV, IEngine_Signal);
	signal(SIGTERM, IEngine_Signal);
	#endif

#ifdef STEAM_ENABLED
	if (!SteamAPI_Init())
	{
		Plat_FatalErrorFunc("Failed to init Steam\n");
	}
#endif

	FileSystem()->InitFilesystem();
	px = px_init();

	if (!ICommandLine::CheckParam("-dedicated"))
	{
		// Run local client
		g_localClient = new IIClient();
		IIEngine::ConnectClient(g_localClient);

		// Init IO
		IVideo::Init();
		IInput::Init();
		IInput::SetInputMode(INPUT_MODE_MENU);
		IFGUI::Init();
	};

	INetworking::Init();

	// load game
	IServer::LoadGame("funnygame");

	// create pipelines for rendering
	if (!ICommandLine::CheckParam("-dedicated"))
		IVideo::CreatePipelines();

	// execute default config
	Console()->AddCommand("exec default.cfg;");
	Console()->Execute();
		
	MainMenu()->Init();
	
	IConsoleUI::Init();
	

};
//-----------------------------------------------------------------------------
// Purpose: Updates every frame
//-----------------------------------------------------------------------------
void IEngine::Frame(float fDelta)
{
	IServer::Think(fDelta);
	if (!ICommandLine::CheckParam("-dedicated"))
	{
		MainMenu()->Frame();
		IFGUI::Frame();
		IVideo::Frame(fDelta);
	}
};

//-----------------------------------------------------------------------------
// Purpose: Deinitializes engine 
//-----------------------------------------------------------------------------
void IEngine::Shutdown()
{
	MainMenu()->Deinit();
	INetworking::Deinit();
};

//-----------------------------------------------------------------------------
// Purpose: Spawns entity in the world
//-----------------------------------------------------------------------------

uint64_t g_lastServerID = 1;
uint64_t g_lastPredictedID = 1;
CBaseEntity *IIEngine::SpawnEntity( const char *szName )
{
	for (auto &entity: EntityManager()->m_RegisteredEntities)
	{
		if (!V_strcmp(entity->m_szName, szName))
		{
			CBaseEntity *pEnt = entity->m_pfn();
			pEnt->m_id = g_lastPredictedID+=1;
			EntityManager()->m_entities.AppendTail(pEnt);
			if (ICommandLine::CheckParam("-dedicated"))
				return pEnt;
			if (entity->m_pClientfn)
			{
				pEnt->pClientEntity = entity->m_pClientfn();
				pEnt->pClientEntity->pEntity = pEnt;
			}
			return pEnt;
		}
	}
	return 0;
};

//-----------------------------------------------------------------------------
// Purpose: Spawns entity without any parameters
//-----------------------------------------------------------------------------
void IIEngine::InitEntity( CBaseEntity *pEntity )
{
	if (!pEntity)
		return;
	pEntity->Spawn();
	if (pEntity->pClientEntity)
		pEntity->pClientEntity->Spawn();
};

//-----------------------------------------------------------------------------
// Purpose: Destroys entity 
//-----------------------------------------------------------------------------
void IIEngine::DestroyEntity( CBaseEntity *pEntity )
{
	uint32_t i = 0;
	if (pEntity == NULL)
		return;
	for (auto &entity: EntityManager()->m_entities)
	{
		if (pEntity == entity)
		{
			pEntity->Destroy();
			if (pEntity->pClientEntity)
				pEntity->pClientEntity->Destroy();
			EntityManager()->m_entities.RemoveAt(i);
			return;
		}
		i++;
	}
};

//-----------------------------------------------------------------------------
// Purpose: Connects client to the server
//-----------------------------------------------------------------------------
void IIEngine::ConnectClient( IIClient *pClient )
{
	g_clients.AppendTail(pClient);
}

//-----------------------------------------------------------------------------
// Purpose: Disconnects client from the server
//-----------------------------------------------------------------------------
void IIEngine::DisconnectClient( IIClient *pClient )
{
	DisconnectClient(pClient->playerID);
}

void IIEngine::DisconnectClient( uint64_t playerID )
{
	uint32_t i = 0;
	for (auto &client: g_clients)
	{
		if (client->playerID == playerID)
		{
			g_clients.RemoveAt(i);
			break;
		}
		i++;
	}
};

void IIEngine::DisconnectClientByHandle( uint32_t playerHandle )
{
	uint32_t i = 0;
	for (auto &client: g_clients)
	{
		if (client->playerHandle == playerHandle)
		{
			IIEngine::DestroyEntity((CBaseEntity*)client->pBasePlayer);
			g_clients.RemoveAt(i);
			break;
		}
		i++;
	}
};