/****************************************************************************
 * Copyright (C) 2015 Dimok
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/
#ifndef CTHREAD_H_
#define CTHREAD_H_


#include <malloc.h>
#include <unistd.h>
#include <dynamic_libs/os_functions.h>
#include "utils/logger.h"

class CThread
{
public:
	typedef void (* Callback)(CThread *thread, void *arg);

	//! constructor
	CThread(s32 iAttr, s32 iPriority = 16, s32 iStackSize = 0x8000, CThread::Callback callback = NULL, void *callbackArg = NULL)
		: pThread(NULL)
		, pThreadStack(NULL)
		, pCallback(callback)
		, pCallbackArg(callbackArg)
	{
	    //! save attribute assignment
	    iAttributes = iAttr;
		//! allocate the thread
		pThread = (OSThread*) memalign(8, 0x1000);
		//! allocate the stack
		pThreadStack = (u8 *) memalign(0x20, iStackSize);
        //! create the thread
		if(pThread && pThreadStack)
            OSCreateThread(pThread, &CThread::threadCallback, 1, this, (u32)pThreadStack+iStackSize, iStackSize, iPriority, iAttributes);
	}

	//! destructor
	virtual ~CThread() { shutdownThread(); }

	static CThread *create(CThread::Callback callback, void *callbackArg, s32 iAttr = eAttributeNone, s32 iPriority = 16, s32 iStackSize = 0x8000)
	{
	    return ( new CThread(iAttr, iPriority, iStackSize, callback, callbackArg) );
	}

	//! Get thread ID
	virtual void* getThread() const { return pThread; }
	//! Thread entry function
	virtual void executeThread(void)
	{
	    if(pCallback)
            pCallback(this, pCallbackArg);
	}
	//! Suspend thread
	virtual void suspendThread(void) { if(isThreadSuspended()) return; if(pThread) OSSuspendThread(pThread); }
	//! Resume thread
	virtual void resumeThread(void) { if(!isThreadSuspended()) return; if(pThread) OSResumeThread(pThread); }
	//! Set thread priority
	virtual void setThreadPriority(s32 prio) { if(pThread) OSSetThreadPriority(pThread, prio); }
	//! Check if thread is suspended
	virtual bool isThreadSuspended(void) const { if(pThread) return OSIsThreadSuspended(pThread); return false; }
	//! Check if thread is terminated
	virtual bool isThreadTerminated(void) const { if(pThread) return OSIsThreadTerminated(pThread); return false; }
	//! Check if thread is running
	virtual bool isThreadRunning(void) const { return !isThreadSuspended() && !isThreadRunning(); }
	//! Shutdown thread
	virtual void shutdownThread(void)
	{
		//! wait for thread to finish
		if(pThread && !(iAttributes & eAttributeDetach))
		{
		    while(isThreadSuspended()){
                resumeThread();
            }
			OSJoinThread(pThread, NULL);
		}
		//! free the thread stack buffer
		if(pThreadStack){
			free(pThreadStack);
        }
		if(pThread)
			free(pThread);
		pThread = NULL;
		pThreadStack = NULL;
	}
    //! Thread attributes
	enum eCThreadAttributes
	{
	    eAttributeNone              = 0x07,
	    eAttributeAffCore0          = 0x01,
	    eAttributeAffCore1          = 0x02,
	    eAttributeAffCore2          = 0x04,
	    eAttributeDetach            = 0x08,
	    eAttributePinnedAff         = 0x10
	};
private:
	static s32 threadCallback(s32 argc, void *arg)
	{
		//! After call to start() continue with the internal function
		((CThread *) arg)->executeThread();
		return 0;
	}
    s32 iAttributes;
	OSThread *pThread;
	u8 *pThreadStack;
	Callback pCallback;
	void *pCallbackArg;
};

#endif