<?php
/* Copyright (C) 2003		Rodolphe Quiedeville	<rodolphe@quiedeville.org>
 * Copyright (c) 2008-2013	Laurent Destailleur		<eldy@users.sourceforge.net>
 * Copyright (C) 2012		Regis Houssin			<regis.houssin@capnetworks.com>
 * Copyright (C) 2012       Marcos García           <marcosgdf@gmail.com>
 *
 * 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/>.
 */

/**
 *  \file       htdocs/core/class/stats.class.php
 *  \ingroup    core
 *  \brief      Common class to manage statistics reports
 */

/**
 * 	Parent class of statistics class
 */
abstract class Stats
{
	protected $db;
	var $_lastfetchdate=array();	// Dates of cache file read by methods
	var $cachefilesuffix='';		// Suffix to add to name of cache file (to avoid file name conflicts)

	/**
	 * Return nb of elements by month for several years
	 *
	 * @param 	int		$endyear		Start year
	 * @param 	int		$startyear		End year
	 * @param	int		$cachedelay		Delay we accept for cache file (0=No read, no save of cache, -1=No read but save)
	 * @return 	array					Array of values
	 */
	function getNbByMonthWithPrevYear($endyear,$startyear,$cachedelay=0)
	{
		global $conf,$user,$langs;

	    if ($startyear > $endyear) return -1;

		$datay=array();

		// Search into cache
		if (! empty($cachedelay))
	    {
	    	include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
	    	include_once DOL_DOCUMENT_ROOT.'/core/lib/json.lib.php';
	    }

		$newpathofdestfile=$conf->user->dir_temp.'/'.get_class($this).'_'.__FUNCTION__.'_'.(empty($this->cachefilesuffix)?'':$this->cachefilesuffix.'_').$langs->defaultlang.'_entity.'.$conf->entity.'_user'.$user->id.'.cache';
		$newmask='0644';

		$nowgmt = dol_now();

		$foundintocache=0;
		if ($cachedelay > 0)
		{
			$filedate=dol_filemtime($newpathofdestfile);
			if ($filedate >= ($nowgmt - $cachedelay))
			{
				$foundintocache=1;

				$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$filedate;
			}
			else
			{
				dol_syslog(get_class($this).'::'.__FUNCTION__." cache file ".$newpathofdestfile." is not found or older than now - cachedelay (".$nowgmt." - ".$cachedelay.") so we can't use it.");
			}
		}

		// Load file into $data
		if ($foundintocache)    // Cache file found and is not too old
		{
			dol_syslog(get_class($this).'::'.__FUNCTION__." read data from cache file ".$newpathofdestfile." ".$filedate.".");
			$data = json_decode(file_get_contents($newpathofdestfile), true);
		}
		else
		{
			$year=$startyear;
			while ($year <= $endyear)
			{
				$datay[$year] = $this->getNbByMonth($year);
				$year++;
			}

			$data = array();

			for ($i = 0 ; $i < 12 ; $i++)
			{
				$data[$i][]=$datay[$endyear][$i][0];
				$year=$startyear;
				while($year <= $endyear)
				{
					$data[$i][]=$datay[$year][$i][1];
					$year++;
				}
			}
		}

		// Save cache file
		if (empty($foundintocache) && ($cachedelay > 0 || $cachedelay == -1))
		{
			dol_syslog(get_class($this).'::'.__FUNCTION__." save cache file ".$newpathofdestfile." onto disk.");
			if (! dol_is_dir($conf->user->dir_temp)) dol_mkdir($conf->user->dir_temp);
			$fp = fopen($newpathofdestfile, 'w');
			fwrite($fp, json_encode($data));
			fclose($fp);
			if (! empty($conf->global->MAIN_UMASK)) $newmask=$conf->global->MAIN_UMASK;
			@chmod($newpathofdestfile, octdec($newmask));

			$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$nowgmt;
		}

		// return array(array('Month',val1,val2,val3),...)
		return $data;
	}

	/**
	 * Return amount of elements by month for several years.
	 * Criterias used to build request are defined into the constructor of parent class into xxx/class/xxxstats.class.php
	 * The caller of class can add more filters into sql request by adding criteris into the $stats->where property just after
	 * calling constructor.
	 *
	 * @param	int		$endyear		Start year
	 * @param	int		$startyear		End year
	 * @param	int		$cachedelay		Delay we accept for cache file (0=No read, no save of cache, -1=No read but save)
	 * @return 	array					Array of values
	 */
	function getAmountByMonthWithPrevYear($endyear,$startyear,$cachedelay=0)
	{
		global $conf,$user,$langs;

        if ($startyear > $endyear) return -1;

        $datay=array();

        // Search into cache
        if (! empty($cachedelay))
        {
        	include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
        	include_once DOL_DOCUMENT_ROOT.'/core/lib/json.lib.php';
        }

        $newpathofdestfile=$conf->user->dir_temp.'/'.get_class($this).'_'.__FUNCTION__.'_'.(empty($this->cachefilesuffix)?'':$this->cachefilesuffix.'_').$langs->defaultlang.'_entity.'.$conf->entity.'_user'.$user->id.'.cache';
        $newmask='0644';

        $nowgmt = dol_now();

        $foundintocache=0;
        if ($cachedelay > 0)
        {
        	$filedate=dol_filemtime($newpathofdestfile);
        	if ($filedate >= ($nowgmt - $cachedelay))
        	{
        		$foundintocache=1;

        		$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$filedate;
        	}
        	else
        	{
        		dol_syslog(get_class($this).'::'.__FUNCTION__." cache file ".$newpathofdestfile." is not found or older than now - cachedelay (".$nowgmt." - ".$cachedelay.") so we can't use it.");
        	}
        }

        // Load file into $data
        if ($foundintocache)    // Cache file found and is not too old
        {
        	dol_syslog(get_class($this).'::'.__FUNCTION__." read data from cache file ".$newpathofdestfile." ".$filedate.".");
        	$data = json_decode(file_get_contents($newpathofdestfile), true);
        }
        else
		{
			$year=$startyear;
			while($year <= $endyear)
			{
				$datay[$year] = $this->getAmountByMonth($year);
				$year++;
			}

			$data = array();
			// $data = array('xval'=>array(0=>xlabel,1=>yval1,2=>yval2...),...)
			for ($i = 0 ; $i < 12 ; $i++)
			{
				$data[$i][]=$datay[$endyear][$i][0];	// set label
				$year=$startyear;
				while($year <= $endyear)
				{
					$data[$i][]=$datay[$year][$i][1];	// set yval for x=i
					$year++;
				}
			}
		}

		// Save cache file
		if (empty($foundintocache) && ($cachedelay > 0 || $cachedelay == -1))
		{
			dol_syslog(get_class($this).'::'.__FUNCTION__." save cache file ".$newpathofdestfile." onto disk.");
			if (! dol_is_dir($conf->user->dir_temp)) dol_mkdir($conf->user->dir_temp);
			$fp = fopen($newpathofdestfile, 'w');
			if ($fp)
			{
				fwrite($fp, json_encode($data));
				fclose($fp);
				if (! empty($conf->global->MAIN_UMASK)) $newmask=$conf->global->MAIN_UMASK;
				@chmod($newpathofdestfile, octdec($newmask));
			}
			else dol_syslog("Failed to write cache file", LOG_ERR);
			$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$nowgmt;
		}

		return $data;
	}

	/**
	 * Return average of entity by month for several years
	 *
	 * @param	int		$endyear		Start year
	 * @param	int		$startyear		End year
	 * @return 	array					Array of values
	 */
	function getAverageByMonthWithPrevYear($endyear,$startyear)
	{
        if ($startyear > $endyear) return -1;

        $datay=array();

		$year=$startyear;
		while($year <= $endyear)
		{
			$datay[$year] = $this->getAverageByMonth($year);
			$year++;
		}

		$data = array();

		for ($i = 0 ; $i < 12 ; $i++)
		{
			$data[$i][]=$datay[$endyear][$i][0];
			$year=$startyear;
			while($year <= $endyear)
			{
				$data[$i][]=$datay[$year][$i][1];
				$year++;
			}
		}

		return $data;
	}

	/**
	 * Return count, and sum of products
	 *
	 * @param	int		$year			Year
	 * @param	int		$cachedelay		Delay we accept for cache file (0=No read, no save of cache, -1=No read but save)
	 * @return 	array					Array of values
	 */
	function getAllByProductEntry($year,$cachedelay=0)
	{
		global $conf,$user,$langs;

        $datay=array();

        // Search into cache
        if (! empty($cachedelay))
        {
        	include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
        	include_once DOL_DOCUMENT_ROOT.'/core/lib/json.lib.php';
        }

        $newpathofdestfile=$conf->user->dir_temp.'/'.get_class($this).'_'.__FUNCTION__.'_'.(empty($this->cachefilesuffix)?'':$this->cachefilesuffix.'_').$langs->defaultlang.'_entity.'.$conf->entity.'_user'.$user->id.'.cache';
        $newmask='0644';

        $nowgmt = dol_now();

        $foundintocache=0;
        if ($cachedelay > 0)
        {
        	$filedate=dol_filemtime($newpathofdestfile);
        	if ($filedate >= ($nowgmt - $cachedelay))
        	{
        		$foundintocache=1;

        		$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$filedate;
        	}
        	else
        	{
        		dol_syslog(get_class($this).'::'.__FUNCTION__." cache file ".$newpathofdestfile." is not found or older than now - cachedelay (".$nowgmt." - ".$cachedelay.") so we can't use it.");
        	}
        }

        // Load file into $data
        if ($foundintocache)    // Cache file found and is not too old
        {
        	dol_syslog(get_class($this).'::'.__FUNCTION__." read data from cache file ".$newpathofdestfile." ".$filedate.".");
        	$data = json_decode(file_get_contents($newpathofdestfile), true);
        }
        else
		{
			$data=$this->getAllByProduct($year);
			//					$data[$i][]=$datay[$year][$i][1];	// set yval for x=i
		}

		// Save cache file
		if (empty($foundintocache) && ($cachedelay > 0 || $cachedelay == -1))
		{
			dol_syslog(get_class($this).'::'.__FUNCTION__." save cache file ".$newpathofdestfile." onto disk.");
			if (! dol_is_dir($conf->user->dir_temp)) dol_mkdir($conf->user->dir_temp);
			$fp = fopen($newpathofdestfile, 'w');
			if ($fp)
			{
				fwrite($fp, json_encode($data));
				fclose($fp);
				if (! empty($conf->global->MAIN_UMASK)) $newmask=$conf->global->MAIN_UMASK;
				@chmod($newpathofdestfile, octdec($newmask));
			}
			$this->_lastfetchdate[get_class($this).'_'.__FUNCTION__]=$nowgmt;
		}

		return $data;
	}


	// Here we have low level of shared code called by XxxStats.class.php


	/**
	 * 	Return nb of elements by year
	 *
	 *	@param	string	$sql		SQL request
	 * 	@return	array
	 */
	function _getNbByYear($sql)
	{
		$result = array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);
		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0;
			while ($i < $num)
			{
				$row = $this->db->fetch_row($resql);
				$result[$i] = $row;
				$i++;
			}
			$this->db->free($resql);
		}
		else {
			dol_print_error($this->db);
		}
		return $result;
	}

	/**
	 * 	Return nb of elements, total amount and avg amount each year
	 *
	 *	@param	string	$sql	SQL request
	 * 	@return	array			Array with nb, total amount, average for each year
	 */
	function _getAllByYear($sql)
	{
		$result = array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);
		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0;
			while ($i < $num)
			{
				$row = $this->db->fetch_object($resql);
				$result[$i]['year'] = $row->year;
				$result[$i]['nb'] = $row->nb;
				if($i>0 && $row->nb) $result[$i-1]['nb_diff'] = ($result[$i-1]['nb'] - $row->nb) / $row->nb * 100;
				$result[$i]['total'] = $row->total;
				if($i>0 && $row->total) $result[$i-1]['total_diff'] = ($result[$i-1]['total'] - $row->total) / $row->total * 100;
				$result[$i]['avg'] = $row->avg;
				if($i>0 && $row->avg) $result[$i-1]['avg_diff'] = ($result[$i-1]['avg'] - $row->avg) / $row->avg * 100;
				// For some $sql only
				if (isset($row->weighted))
				{
				    $result[$i]['weighted'] = $row->weighted;
				    if($i>0 && $row->weighted) $result[$i-1]['avg_weighted'] = ($result[$i-1]['weighted'] - $row->weighted) / $row->weighted * 100;
				}
				$i++;
			}
			$this->db->free($resql);
		}
		else {
			dol_print_error($this->db);
		}
		return $result;
	}

	/**
	 *     Renvoie le nombre de proposition par mois pour une annee donnee
	 *
     *     @param   int		$year       Year
     *     @param   string	$sql        SQL
     *     @param	int		$format		0=Label of absiss is a translated text, 1=Label of absiss is a number
     *     @return	array				Array of nb each month
	 */
	function _getNbByMonth($year, $sql, $format=0)
	{
		$result=array();
		$res=array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);
		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0; $j = 0;
			while ($i < $num)
			{
				$row = $this->db->fetch_row($resql);
				$j = $row[0] * 1;
				$result[$j] = $row[1];
				$i++;
			}
			$this->db->free($resql);
		}
		else
		{
			dol_print_error($this->db);
		}

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$res[$i] = (isset($result[$i])?$result[$i]:0);
		}

		$data = array();

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$month=dol_print_date(dol_mktime(12,0,0,$i,1,$year),($format?"%m":"%b"));
			$month=dol_substr($month,0,3);
			$data[$i-1] = array($month, $res[$i]);
		}

		return $data;
	}


	/**
	 *     Renvoie le nombre d'element par mois pour une annee donnee
	 *
	 *     @param	int		$year       Year
	 *     @param   string	$sql		SQL
     *     @param	int		$format		0=Label of absiss is a translated text, 1=Label of absiss is a number
	 *     @return	array
	 */
	function _getAmountByMonth($year, $sql, $format=0)
	{
		$result=array();
		$res=array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);

		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0;
			while ($i < $num)
		  	{
		  		$row = $this->db->fetch_row($resql);
		  		$j = $row[0] * 1;
		  		$result[$j] = $row[1];
		  		$i++;
		  	}
		  	$this->db->free($resql);
		}
        else dol_print_error($this->db);

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$res[$i] = (int) round((isset($result[$i])?$result[$i]:0));
		}

		$data = array();

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$month=dol_print_date(dol_mktime(12,0,0,$i,1,$year),($format?"%m":"%b"));
			$month=dol_substr($month,0,3);
			$data[$i-1] = array($month, $res[$i]);
		}

		return $data;
	}

	/**
	 *	   Renvoie le montant moyen par mois pour une annee donnee
	 *
     *     @param	int		$year       Year
     *     @param  	string	$sql        SQL
	 *     @param	int		$format		0=Label of absiss is a translated text, 1=Label of absiss is a number
	 *     @return	array
	 */
	function _getAverageByMonth($year, $sql, $format=0)
	{
		$result=array();
		$res=array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);
		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0; $j = 0;
			while ($i < $num)
			{
		  		$row = $this->db->fetch_row($resql);
		  		$j = $row[0] * 1;
		  		$result[$j] = $row[1];
		  		$i++;
		  	}
		  	$this->db->free($resql);
		}
        else dol_print_error($this->db);

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$res[$i] = (isset($result[$i])?$result[$i]:0);
		}

		$data = array();

		for ($i = 1 ; $i < 13 ; $i++)
		{
			$month=dol_print_date(dol_mktime(12,0,0,$i,1,$year),($format?"%m":"%b"));
			$month=dol_substr($month,0,3);
			$data[$i-1] = array($month, $res[$i]);
		}

		return $data;
	}


	/**
	 *	   Return number or total of product refs
	 *
     *     @param  	string	$sql        SQL
     *     @param	int		$limit		Limit
     *     @return	array
	 */
	function _getAllByProduct($sql, $limit=10)
	{
		global $langs;

		$result=array();
		$res=array();

		dol_syslog(get_class($this).'::'.__FUNCTION__."", LOG_DEBUG);
		$resql=$this->db->query($sql);
		if ($resql)
		{
			$num = $this->db->num_rows($resql);
			$i = 0; $other=0;
			while ($i < $num)
			{
		  		$row = $this->db->fetch_row($resql);
		  		if ($i < $limit || $num == $limit) $result[$i] = array($row[0],$row[1]);	// Ref of product, nb
		  		else $other += $row[1];
		  		$i++;
		  	}
		  	if ($num > $limit) $result[$i] = array($langs->transnoentitiesnoconv("Other"),$other);
		  	$this->db->free($resql);
		}
        else dol_print_error($this->db);

		return $result;
	}
}

