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<?php

/***************************************************************************\
 *  SPIP, Systeme de publication pour l'internet                           *
 *                                                                         *
 *  Copyright (c) 2001-2016                                                *
 *  Arnaud Martin, Antoine Pitrou, Philippe Riviere, Emmanuel Saint-James  *
 *                                                                         *
 *  Ce programme est un logiciel libre distribue sous licence GNU/GPL.     *
 *  Pour plus de details voir le fichier COPYING.txt ou l'aide en ligne.   *
\***************************************************************************/


if (!defined('_ECRIRE_INC_VERSION')) {
	return;
}

/*
 * Des fonctions pour les requetes SQL
 * 
 * Voir la liste des fonctions natives : http://www.sqlite.org/lang_corefunc.html
 * Et la liste des evolutions pour : http://sqlite.org/changes.html
 * 
 */
// http://code.spip.net/@_sqlite_init_functions
function _sqlite_init_functions(&$sqlite) {

	if (!$sqlite) {
		return false;
	}


	$fonctions = array(
		'CONCAT' => array('_sqlite_func_concat', -1),
		'CEIL' => array('_sqlite_func_ceil', 1),
		// absent de sqlite2

		'DATE_FORMAT' => array('_sqlite_func_strftime', 2),
		'DAYOFMONTH' => array('_sqlite_func_dayofmonth', 1),

		'EXTRAIRE_MULTI' => array('_sqlite_func_extraire_multi', 2),
		// specifique a SPIP/sql_multi()
		'EXP' => array('exp', 1),
		//exponentielle
		'FIND_IN_SET' => array('_sqlite_func_find_in_set', 2),
		'FLOOR' => array('_sqlite_func_floor', 1),
		// absent de sqlite2

		'IF' => array('_sqlite_func_if', 3),
		'INSERT' => array('_sqlite_func_insert', 4),
		'INSTR' => array('_sqlite_func_instr', 2),

		'LEAST' => array('_sqlite_func_least', 3),
		'_LEFT' => array('_sqlite_func_left', 2),
#		'LENGTH'		=> array( 'strlen'						,1), // present v1.0.4
#		'LOWER'			=> array( 'strtolower'					,1), // present v2.4
#		'LTRIM'			=> array( 'ltrim'						,1), // present en theorie

		'NOW' => array('_sqlite_func_now', 0),

		'MD5' => array('md5', 1),
		'MONTH' => array('_sqlite_func_month', 1),

		'PREG_REPLACE' => array('_sqlite_func_preg_replace', 3),

		'RAND' => array('_sqlite_func_rand', 0),
		// sinon random() v2.4
		'REGEXP' => array('_sqlite_func_regexp_match', 2),
		// critere REGEXP supporte a partir de v3.3.2
		//'REGEXP_MATCH'	=> array( '_sqlite_func_regexp_match'	,2), // critere REGEXP supporte a partir de v3.3.2

		'RIGHT' => array('_sqlite_func_right', 2),
#		'RTRIM'			=> array( 'rtrim'						,1), // present en theorie

		'SETTYPE' => array('settype', 2),
		// CAST present en v3.2.3
		'SQRT' => array('sqrt', 1),
		'SUBSTRING' => array('_sqlite_func_substring'            /*,3*/),
		// peut etre appelee avec 2 ou 3 arguments, index base 1 et non 0

		'TO_DAYS' => array('_sqlite_func_to_days', 1),
#		'TRIM'			=> array( 'trim'						,1), // present en theorie

		'TIMESTAMPDIFF' => array('_sqlite_timestampdiff'    /*,3*/),

		'UNIX_TIMESTAMP' => array('_sqlite_func_unix_timestamp', 1),
#		'UPPER'			=> array( 'strtoupper'					,1), // present v2.4		

		'VIDE' => array('_sqlite_func_vide', 0),
		// du vide pour SELECT 0 as x ... ORDER BY x -> ORDER BY vide()

		'YEAR' => array('_sqlite_func_year', 1)
	);


	foreach ($fonctions as $f => $r) {
		_sqlite_add_function($sqlite, $f, $r);
	}

	#spip_log('functions sqlite chargees ','sqlite.'._LOG_DEBUG);
}

// permet au besoin de charger des fonctions ailleurs par _sqlite_init_functions();
// http://code.spip.net/@_sqlite_add_function
function _sqlite_add_function(&$sqlite, &$f, &$r) {
	if (_sqlite_is_version(3, $sqlite)) {
		isset($r[1])
			? $sqlite->sqliteCreateFunction($f, $r[0], $r[1])
			: $sqlite->sqliteCreateFunction($f, $r[0]);
	} else {
		isset($r[1])
			? sqlite_create_function($sqlite, $f, $r[0], $r[1])
			: sqlite_create_function($sqlite, $f, $r[0]);
	}
}

//
// SQLite : fonctions sqlite -> php
// entre autre auteurs : mlebas
//

function _sqlite_func_ceil($a) {
	return ceil($a);
}

// http://code.spip.net/@_sqlite_func_concat
function _sqlite_func_concat() {
	$args = func_get_args();

	return join('', $args);
}


// http://code.spip.net/@_sqlite_func_dayofmonth
function _sqlite_func_dayofmonth($d) {
	return _sqlite_func_date("d", $d);
}


// http://code.spip.net/@_sqlite_func_find_in_set
function _sqlite_func_find_in_set($num, $set) {
	$rank = 0;
	foreach (explode(",", $set) as $v) {
		if ($v == $num) {
			return (++$rank);
		}
		$rank++;
	}

	return 0;
}

function _sqlite_func_floor($a) {
	return floor($a);
}

// http://code.spip.net/@_sqlite_func_if
function _sqlite_func_if($bool, $oui, $non) {
	return ($bool) ? $oui : $non;
}


/*
 * INSERT(chaine, index, longueur, chaine) 	MySQL
 * Retourne une chaine de caracteres a partir d'une chaine dans laquelle "sschaine"
 *  a ete inseree a la position "index" en remplacant "longueur" caracteres.
 */
// http://code.spip.net/@_sqlite_func_insert
function _sqlite_func_insert($s, $index, $longueur, $chaine) {
	return
		substr($s, 0, $index)
		. $chaine
		. substr(substr($s, $index), $longueur);
}


// http://code.spip.net/@_sqlite_func_instr
function _sqlite_func_instr($s, $search) {
	return strpos($s, $search);
}


// http://code.spip.net/@_sqlite_func_least
function _sqlite_func_least() {
	$arg_list = func_get_args();
	$least = min($arg_list);

	#spip_log("Passage avec LEAST : $least",'sqlite.'._LOG_DEBUG);
	return $least;
}


// http://code.spip.net/@_sqlite_func_left
function _sqlite_func_left($s, $lenght) {
	return substr($s, $lenght);
}


// http://code.spip.net/@_sqlite_func_now
function _sqlite_func_now() {
	static $now = null;
	if (is_null($now)) {
		$now = date("Y-m-d H:i:s");
	}

	#spip_log("Passage avec NOW : $now",'sqlite.'._LOG_DEBUG);
	return $now;
}


// http://code.spip.net/@_sqlite_func_month
function _sqlite_func_month($d) {
	return _sqlite_func_date("m", $d);
}


// http://code.spip.net/@_sqlite_func_preg_replace
function _sqlite_func_preg_replace($quoi, $cherche, $remplace) {
	$return = preg_replace('%' . $cherche . '%', $remplace, $quoi);

	#spip_log("preg_replace : $quoi, $cherche, $remplace, $return",'sqlite.'._LOG_DEBUG);
	return $return;
}

/**
 * Extrait une langue d'un texte <multi>[fr] xxx [en] yyy</multi>
 *
 * @param string $quoi le texte contenant ou non un multi
 * @param string $lang la langue a extraire
 * @return string, l'extrait trouve.
 **/
function _sqlite_func_extraire_multi($quoi, $lang) {
	if (!defined('_EXTRAIRE_MULTI')) {
		include_spip('inc/filtres');
	}
	if (!function_exists('approcher_langue')) {
		include_spip('inc/lang');
	}
	if (preg_match_all(_EXTRAIRE_MULTI, $quoi, $regs, PREG_SET_ORDER)) {
		foreach ($regs as $reg) {
			// chercher la version de la langue courante
			$trads = extraire_trads($reg[1]);
			if ($l = approcher_langue($trads, $lang)) {
				$trad = $trads[$l];
			} else {
				$trad = reset($trads);
			}
			$quoi = str_replace($reg[0], $trad, $quoi);
		}
	}

	return $quoi;
}


// http://code.spip.net/@_sqlite_func_rand
function _sqlite_func_rand() {
	return rand();
}


// http://code.spip.net/@_sqlite_func_right
function _sqlite_func_right($s, $length) {
	return substr($s, 0 - $length);
}


// http://code.spip.net/@_sqlite_func_regexp_match
function _sqlite_func_regexp_match($cherche, $quoi) {
	// optimiser un cas tres courant avec les requetes en base
	if (!$quoi and !strlen($quoi)) {
		return false;
	}
	$u = isset($GLOBALS['meta']['pcre_u']) ? $GLOBALS['meta']['pcre_u'] : 'u';
	$return = preg_match('%' . $cherche . '%imsS' . $u, $quoi);

	#spip_log("regexp_replace : $quoi, $cherche, $remplace, $return",'sqlite.'._LOG_DEBUG);
	return $return;
}

// http://code.spip.net/@_sqlite_func_strftime
function _sqlite_func_strftime($date, $conv) {
	return strftime($conv, is_int($date) ? $date : strtotime($date));
}

/**
 * Nombre de jour entre 0000-00-00 et $d
 * http://code.spip.net/@_sqlite_func_to_days
 * cf http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_to-days
 *
 * @param string $d
 * @return int
 */
function _sqlite_func_to_days($d) {
	static $offset = 719528; // nb de jour entre 0000-00-00 et timestamp 0=1970-01-01
	$result = $offset + (int)ceil(_sqlite_func_unix_timestamp($d) / (24 * 3600));

	#spip_log("Passage avec TO_DAYS : $d, $result",'sqlite.'._LOG_DEBUG);
	return $result;
}

function _sqlite_func_substring($string, $start, $len = null) {
	// SQL compte a partir de 1, php a partir de 0
	$start = ($start > 0) ? $start - 1 : $start;
	if (is_null($len)) {
		return substr($string, $start);
	} else {
		return substr($string, $start, $len);
	}
}

/**
 * Calcul de la difference entre 2 timestamp, exprimes dans l'unite fournie en premier argument
 * emule https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_timestampdiff
 *
 * @param string $unit
 * @param string $date1
 * @param string $date2
 * @return int
 */
function _sqlite_timestampdiff($unit, $date1, $date2) {
	// PHP >= 5.3
	if (function_exists("date_diff")) {
		$d1 = date_create($date1);
		$d2 = date_create($date2);
		$diff = date_diff($d1, $d2);
		$inv = $diff->invert ? -1 : 1;
		switch ($unit) {
			case "YEAR":
				return $inv * $diff->y;
			case "QUARTER":
				return $inv * (4 * $diff->y + intval(floor($diff->m / 3)));
			case "MONTH":
				return $inv * (12 * $diff->y + $diff->m);
			case "WEEK":
				return $inv * intval(floor($diff->days / 7));
			case "DAY":
				#var_dump($inv*$diff->days);
				return $inv * $diff->days;
			case "HOUR":
				return $inv * (24 * $diff->days + $diff->h);
			case "MINUTE":
				return $inv * ((24 * $diff->days + $diff->h) * 60 + $diff->i);
			case "SECOND":
				return $inv * (((24 * $diff->days + $diff->h) * 60 + $diff->i) * 60 + $diff->s);
			case "MICROSECOND":
				return $inv * (((24 * $diff->days + $diff->h) * 60 + $diff->i) * 60 + $diff->s) * 1000000;
		}

		return 0;
	} // PHP < 5.3
	else {
		$d1 = strtotime($date1);
		$d2 = strtotime($date2);
		$diff = $d2 - $d1;
		$sign = ($diff < 0 ? -1 : 1);
		$diff = $sign * $diff;
		switch ($unit) {
			case "YEAR":
				$diff = $d2 - $d1;

				return $sign * (date('Y', abs($diff)) - date('Y', 0));
			case "QUARTER":
				return $sign * (4 * (date('Y', abs($diff)) - date('Y', 0)) + intval(floor((date('m', $diff) - 1) / 3)));
			case "MONTH":
				return $sign * ((date('Y', $diff) - date('Y', 0)) * 12 + date('m', $diff) - 1);
			case "WEEK":
				return intval(floor(($d2 - $d1) / 3600 / 7));
			case "DAY":
				return intval(floor(($d2 - $d1) / 3600 / 24));
			case "HOUR":
				return intval(floor(($d2 - $d1) / 3600));
			case "MINUTE":
				return intval(floor(($d2 - $d1) / 60));
			case "SECOND":
				return $d2 - $d1;
			case "MICROSECOND":
				return $d2 - $d1 * 1000000;
		}
	}
}

// http://code.spip.net/@_sqlite_func_unix_timestamp
function _sqlite_func_unix_timestamp($d) {
	static $mem = array();
	static $n = 0;
	if (isset($mem[$d])) {
		return $mem[$d];
	}
	if ($n++ > 100) {
		$mem = array();
		$n = 0;
	}

	//2005-12-02 20:53:53
	#spip_log("Passage avec UNIX_TIMESTAMP : $d",'sqlite.'._LOG_DEBUG);
	if (!$d) {
		return $mem[$d] = mktime();
	}

	// une pile plus grosse n'accelere pas le calcul
	return $mem[$d] = strtotime($d);
}


// http://code.spip.net/@_sqlite_func_year
function _sqlite_func_year($d) {
	return _sqlite_func_date("Y", $d);
}

/**
 * version optimisee et memoizee de date() utilisee par
 * _sqlite_func_year, _sqlite_func_month, _sqlite_func_dayofmonth
 *
 * @param string $quoi
 *   format : Y, m, ou d
 * @param int $d
 *   timestamp
 * @return int
 */
function _sqlite_func_date($quoi, $d) {
	static $mem = array();
	static $n = 0;
	if (isset($mem[$d])) {
		return $mem[$d][$quoi];
	}
	if ($n++ > 100) {
		$mem = array();
		$n = 0;
	}

	$dec = date("Y-m-d", _sqlite_func_unix_timestamp($d));
	$mem[$d] = array("Y" => substr($dec, 0, 4), "m" => substr($dec, 5, 2), "d" => substr($dec, 8, 2));

	return $mem[$d][$quoi];
}

// http://code.spip.net/@_sqlite_func_vide
function _sqlite_func_vide() {
	return;
}