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/*

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This file is part of CanFestival, a library implementing CanOpen Stack. 

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Copyright (C): Edouard TISSERANT and Francis DUPIN

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See COPYING file for copyrights details.

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This library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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This library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with this library; if not, write to the Free Software

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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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*/

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/* #define DEBUG_WAR_CONSOLE_ON */

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/* #define DEBUG_ERR_CONSOLE_ON */

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#include <applicfg.h>

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#include "timer.h"

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/*  ---------  The timer table --------- */

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s_timer_entry timers[MAX_NB_TIMER] = {{TIMER_FREE, NULL, NULL, 0, 0, 0},};

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TIMEVAL total_sleep_time = TIMEVAL_MAX;

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TIMER_HANDLE last_timer_raw = -1;

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#define minval(a,b) ((a<b)?a:b)

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/* ---------  Use this to declare a new alarm --------- */

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TIMER_HANDLE SetAlarm(CO_Data* d, UNS32 id, TimerCallback_t callback, TIMEVAL value, TIMEVAL period)

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{

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	/*printf("SetAlarm(UNS32 id=%d, TimerCallback_t callback=%x, TIMEVAL value=%d, TIMEVAL period=%d)\n", id, callback, value, period); */

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	TIMER_HANDLE i;

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	TIMER_HANDLE row_number = TIMER_NONE;

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	/* in order to decide new timer setting we have to run over all timer rows */

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	for(i=0; i <= last_timer_raw + 1 && i < MAX_NB_TIMER; i++)

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	{

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		s_timer_entry *row = (timers+i);

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		if (callback && 	/* if something to store */

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		   row->state == TIMER_FREE) /* and empty row */

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		{	/* just store */

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			row->callback = callback;

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			row->d = d;

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			row->id = id;

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			row->val = value;

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			row->interval = period;

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			row->state = TIMER_ARMED;

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			row_number = i;

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			break;

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		}

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	}

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	if (row_number != TIMER_NONE) /* if successfull **/

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	{

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		TIMEVAL real_timer_value;

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		TIMEVAL elapsed_time;

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		if (row_number == last_timer_raw + 1) last_timer_raw++;

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		/* set next wakeup alarm if new entry is sooner than others, or if it is alone */

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		real_timer_value = minval(value, TIMEVAL_MAX);

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		elapsed_time = getElapsedTime();

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		/*printf("elapsed_time=%d real_timer_value=%d total_sleep_time=%d\n", elapsed_time, real_timer_value, total_sleep_time); */

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		if (total_sleep_time > elapsed_time && total_sleep_time - elapsed_time > real_timer_value)

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		{

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			total_sleep_time = elapsed_time + real_timer_value;

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			setTimer(real_timer_value);

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		}

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		/*printf("SetAlarm() return %d\n", row_number); */

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		return row_number;

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	}

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	return TIMER_NONE;

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}

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/* ---------  Use this to remove an alarm --------- */

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TIMER_HANDLE DelAlarm(TIMER_HANDLE handle)

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{

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	/* Quick and dirty. system timer will continue to be trigged, but no action will be preformed. */

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	MSG_WAR(0x3320, "DelAlarm. handle = ", handle);

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	if(handle != TIMER_NONE)

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	{

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		if(handle == last_timer_raw) 

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			last_timer_raw--;

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		timers[handle].state = TIMER_FREE; 		

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	}

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	else {

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	}

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	return TIMER_NONE;

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}

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/* ---------  TimeDispatch is called on each timer expiration --------- */

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void TimeDispatch()

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{

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	TIMER_HANDLE i;

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	TIMEVAL next_wakeup = TIMEVAL_MAX; /* used to compute when should normaly occur next wakeup */

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	/* First run : change timer state depending on time */

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	/* Get time since timer signal */

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	TIMEVAL overrun = getElapsedTime();

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	TIMEVAL real_total_sleep_time = total_sleep_time + overrun;

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	/*printf("total_sleep_time %d + overrun %d\n", total_sleep_time , overrun); */

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	for(i=0; i <= last_timer_raw; i++)

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	{

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		s_timer_entry *row = (timers+i);

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		if (row->state & TIMER_ARMED) /* if row is active */

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		{

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			if (row->val <= real_total_sleep_time) /* to be trigged */

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			{

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				/*printf("row->val(%d) <= (%d)real_total_sleep_time\n", row->val, real_total_sleep_time); */

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				if (!row->interval) /* if simply outdated */

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				{

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					row->state = TIMER_TRIG; /* ask for trig */

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				}

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				else /* or period have expired */

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				{

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					/* set val as interval, with overrun correction */

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					row->val = row->interval - (overrun % row->interval);

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					row->state = TIMER_TRIG_PERIOD; /* ask for trig, periodic */

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					/* Check if this new timer value is the soonest */

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					next_wakeup = minval(row->val,next_wakeup);

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				}

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			}

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			else

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			{

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				/* Each armed timer value in decremented. */

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				row->val -= real_total_sleep_time;

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				/* Check if this new timer value is the soonest */

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				next_wakeup = minval(row->val,next_wakeup);

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			}

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		}

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	}

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	/* Remember how much time we should sleep. */

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	total_sleep_time = next_wakeup;

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	/* Set timer to soonest occurence */

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	setTimer(next_wakeup);

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	/* Then trig them or not. */

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	for(i=0; i<=last_timer_raw; i++)

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	{

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		s_timer_entry *row = (timers+i);

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		if (row->state & TIMER_TRIG)

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		{

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			row->state &= ~TIMER_TRIG; /* reset trig state (will be free if not periodic) */

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			(*row->callback)(row->d, row->id); /* trig ! */

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		}

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	}

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}

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