<?php
/* Copyright (C) 2005      Rodolphe Quiedeville <rodolphe@quiedeville.org>
 * Copyright (C) 2004-2018 Laurent Destailleur  <eldy@users.sourceforge.net>
 *
 * 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 <https://www.gnu.org/licenses/>.
 */

/**
 *		\file       htdocs/core/class/discount.class.php
 * 		\ingroup    core propal facture commande
 *		\brief      File of class to manage absolute discounts
 */


/**
 *		Class to manage absolute discounts
 */
class DiscountAbsolute
{
	/**
	 * @var DoliDB Database handler.
	 */
	public $db;

	/**
	 * @var string Error code (or message)
	 */
	public $error;

	/**
	 * @var string[]	Array of error strings
	 */
	public $errors = array();

	/**
	 * @var int ID discount
	 */
	public $id;

	/**
	 * @var int Thirdparty ID
	 */
	public $fk_soc;

	public $discount_type; // 0 => customer discount, 1 => supplier discount
	public $amount_ht; //
	public $amount_tva; //
	public $amount_ttc; //
	public $multicurrency_amount_ht;
	public $multicurrency_amount_tva;
	public $multicurrency_amount_ttc;
	// Vat rate
	public $tva_tx;
	public $vat_src_code;

	/**
	 * @var int User ID Id utilisateur qui accorde la remise
	 */
	public $fk_user;

	/**
	 * @var string description
	 */
	public $description;

	/**
	 * Date creation record (datec)
	 *
	 * @var integer
	 */
	public $datec;

	/**
	 * @var int ID invoice line when a discount is used into an invoice line (for absolute discounts)
	 */
	public $fk_facture_line;

	/**
	 * @var int ID invoice when a discount line is used into an invoice (for credit note)
	 */
	public $fk_facture;

	/**
	 * @var int ID credit note or deposit used to create the discount
	 */
	public $fk_facture_source;
	public $ref_facture_source; // Ref credit note or deposit used to create the discount
	public $type_facture_source;

	public $fk_invoice_supplier_source;
	public $ref_invoice_supplier_source; // Ref credit note or deposit used to create the discount
	public $type_invoice_supplier_source;

	/**
	 *	Constructor
	 *
	 *  @param  	DoliDB		$db		Database handler
	 */
	public function __construct($db)
	{
		$this->db = $db;
	}


	/**
	 *	Load object from database into memory
	 *
	 *  @param      int		$rowid       					id discount to load
	 *  @param      int		$fk_facture_source				fk_facture_source
	 *  @param		int		$fk_invoice_supplier_source		fk_invoice_supplier_source
	 *	@return		int										<0 if KO, =0 if not found, >0 if OK
	 */
	public function fetch($rowid, $fk_facture_source = 0, $fk_invoice_supplier_source = 0)
	{
		global $conf;

		// Check parameters
		if (!$rowid && !$fk_facture_source && !$fk_invoice_supplier_source)
		{
			$this->error = 'ErrorBadParameters';
			return -1;
		}

		$sql = "SELECT sr.rowid, sr.fk_soc, sr.discount_type,";
		$sql .= " sr.fk_user,";
		$sql .= " sr.amount_ht, sr.amount_tva, sr.amount_ttc, sr.tva_tx, sr.vat_src_code,";
		$sql .= " sr.multicurrency_amount_ht, sr.multicurrency_amount_tva, sr.multicurrency_amount_ttc,";
		$sql .= " sr.fk_facture_line, sr.fk_facture, sr.fk_facture_source, sr.fk_invoice_supplier_line, sr.fk_invoice_supplier, sr.fk_invoice_supplier_source, sr.description,";
		$sql .= " sr.datec,";
		$sql .= " f.ref as ref_facture_source, f.type as type_facture_source,";
		$sql .= " fsup.ref as ref_invoice_supplier_source, fsup.type as type_invoice_supplier_source";
		$sql .= " FROM ".MAIN_DB_PREFIX."societe_remise_except as sr";
		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."facture as f ON sr.fk_facture_source = f.rowid";
		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."facture as fsup ON sr.fk_invoice_supplier_source = fsup.rowid";
		$sql .= " WHERE sr.entity IN (".getEntity('invoice').")";
		if ($rowid) $sql .= " AND sr.rowid=".$rowid;
		if ($fk_facture_source) $sql .= " AND sr.fk_facture_source=".$fk_facture_source;
		if ($fk_invoice_supplier_source) $sql .= " AND sr.fk_invoice_supplier_source=".$fk_invoice_supplier_source;

		dol_syslog(get_class($this)."::fetch", LOG_DEBUG);
		$resql = $this->db->query($sql);
		if ($resql)
		{
			if ($this->db->num_rows($resql))
			{
				$obj = $this->db->fetch_object($resql);

				$this->id = $obj->rowid;
				$this->fk_soc = $obj->fk_soc;
				$this->discount_type = $obj->discount_type;

				$this->amount_ht = $obj->amount_ht;
				$this->amount_tva = $obj->amount_tva;
				$this->amount_ttc = $obj->amount_ttc;

				$this->multicurrency_amount_ht = $this->multicurrency_subprice = $obj->multicurrency_amount_ht;
				$this->multicurrency_amount_tva = $obj->multicurrency_amount_tva;
				$this->multicurrency_amount_ttc = $obj->multicurrency_amount_ttc;

				$this->tva_tx = $obj->tva_tx;
				$this->vat_src_code = $obj->vat_src_code;

				$this->fk_user = $obj->fk_user;
				$this->fk_facture_line = $obj->fk_facture_line;
				$this->fk_facture = $obj->fk_facture;
				$this->fk_facture_source = $obj->fk_facture_source; // Id credit note or deposit source
				$this->ref_facture_source = $obj->ref_facture_source; // Ref credit note or deposit  source
				$this->type_facture_source = $obj->type_facture_source; // Type credit note or deposit  source
				$this->fk_invoice_supplier_line = $obj->fk_invoice_supplier_line;
				$this->fk_invoice_supplier = $obj->fk_invoice_supplier;
				$this->fk_invoice_supplier_source = $obj->fk_invoice_supplier_source; // Id credit note or deposit source
				$this->ref_invoice_supplier_source = $obj->ref_invoice_supplier_source; // Ref credit note or deposit  source
				$this->type_invoice_supplier_source = $obj->type_invoice_supplier_source; // Type credit note or deposit  source
				$this->description = $obj->description;
				$this->datec = $this->db->jdate($obj->datec);

				$this->db->free($resql);
				return 1;
			} else {
				$this->db->free($resql);
				return 0;
			}
		} else {
			$this->error = $this->db->error();
			return -1;
		}
	}


	/**
	 *      Create a discount into database
	 *
	 *      @param      User	$user       User that create
	 *      @return     int         		<0 if KO, >0 if OK
	 */
	public function create($user)
	{
		global $conf, $langs;

		// Clean parameters
		$this->amount_ht = price2num($this->amount_ht);
		$this->amount_tva = price2num($this->amount_tva);
		$this->amount_ttc = price2num($this->amount_ttc);

		$this->tva_tx = price2num($this->tva_tx);

		$this->multicurrency_amount_ht = price2num($this->multicurrency_amount_ht);
		$this->multicurrency_amount_tva = price2num($this->multicurrency_amount_tva);
		$this->multicurrency_amount_ttc = price2num($this->multicurrency_amount_ttc);

		if (empty($this->multicurrency_amount_ht)) $this->multicurrency_amount_ht = 0;
		if (empty($this->multicurrency_amount_tva)) $this->multicurrency_amount_tva = 0;
		if (empty($this->multicurrency_amount_ttc)) $this->multicurrency_amount_ttc = 0;
		if (empty($this->tva_tx)) $this->tva_tx = 0;

		// Check parameters
		if (empty($this->description))
		{
			$this->error = 'BadValueForPropertyDescription';
			dol_syslog(get_class($this)."::create ".$this->error, LOG_ERR);
			return -1;
		}

		$userid = $user->id;
		if (!($userid > 0))		// For example when record is saved into an anonymous context with a not loaded object $user.
		{
			include_once DOL_DOCUMENT_ROOT.'/compta/facture/class/facture.class.php';
			$tmpinvoice = new Facture($this->db);
			$tmpinvoice->fetch($this->fk_facture_source);
			$userid = $tmpinvoice->fk_user_author; // We use the author of invoice
		}

		// Insert request
		$sql = "INSERT INTO ".MAIN_DB_PREFIX."societe_remise_except";
		$sql .= " (entity, datec, fk_soc, discount_type, fk_user, description,";
		$sql .= " amount_ht, amount_tva, amount_ttc, tva_tx, vat_src_code,";
		$sql .= " multicurrency_amount_ht, multicurrency_amount_tva, multicurrency_amount_ttc,";
		$sql .= " fk_facture_source, fk_invoice_supplier_source";
		$sql .= ")";
		$sql .= " VALUES (".$conf->entity.", '".$this->db->idate($this->datec != '' ? $this->datec : dol_now())."', ".$this->fk_soc.", ".(empty($this->discount_type) ? 0 : intval($this->discount_type)).", ".$userid.", '".$this->db->escape($this->description)."',";
		$sql .= " ".$this->amount_ht.", ".$this->amount_tva.", ".$this->amount_ttc.", ".$this->tva_tx.", '".$this->db->escape($this->vat_src_code)."',";
		$sql .= " ".$this->multicurrency_amount_ht.", ".$this->multicurrency_amount_tva.", ".$this->multicurrency_amount_ttc.", ";
		$sql .= " ".($this->fk_facture_source ? "'".$this->db->escape($this->fk_facture_source)."'" : "null").",";
		$sql .= " ".($this->fk_invoice_supplier_source ? "'".$this->db->escape($this->fk_invoice_supplier_source)."'" : "null");
		$sql .= ")";

		dol_syslog(get_class($this)."::create", LOG_DEBUG);
		$resql = $this->db->query($sql);
		if ($resql)
		{
			$this->id = $this->db->last_insert_id(MAIN_DB_PREFIX."societe_remise_except");
			return $this->id;
		} else {
			$this->error = $this->db->lasterror().' - sql='.$sql;
			return -1;
		}
	}


	/**
	 *  Delete object in database. If fk_facture_source is defined, we delete all familiy with same fk_facture_source. If not, only with id is removed
	 *
	 *  @param      User    $user       Object of user asking to delete
	 *  @return     int                 <0 if KO, >0 if OK
	 */
	public function delete($user)
	{
		global $conf, $langs;

		// Check if we can remove the discount
		if ($this->fk_facture_source)
		{
			$sql = "SELECT COUNT(rowid) as nb";
			$sql .= " FROM ".MAIN_DB_PREFIX."societe_remise_except";
			$sql .= " WHERE (fk_facture_line IS NOT NULL"; // Not used as absolute simple discount
			$sql .= " OR fk_facture IS NOT NULL)"; // Not used as credit note and not used as deposit
			$sql .= " AND fk_facture_source = ".$this->fk_facture_source;
			//$sql.=" AND rowid != ".$this->id;

			dol_syslog(get_class($this)."::delete Check if we can remove discount", LOG_DEBUG);
			$resql = $this->db->query($sql);
			if ($resql)
			{
				$obj = $this->db->fetch_object($resql);
				if ($obj->nb > 0)
				{
					$this->error = 'ErrorThisPartOrAnotherIsAlreadyUsedSoDiscountSerieCantBeRemoved';
					return -2;
				}
			} else {
				dol_print_error($this->db);
				return -1;
			}
		}

		// Check if we can remove the discount
		if ($this->fk_invoice_supplier_source)
		{
			$sql = "SELECT COUNT(rowid) as nb";
			$sql .= " FROM ".MAIN_DB_PREFIX."societe_remise_except";
			$sql .= " WHERE (fk_invoice_supplier_line IS NOT NULL"; // Not used as absolute simple discount
			$sql .= " OR fk_invoice_supplier IS NOT NULL)"; // Not used as credit note and not used as deposit
			$sql .= " AND fk_invoice_supplier_source = ".$this->fk_invoice_supplier_source;
			//$sql.=" AND rowid != ".$this->id;

			dol_syslog(get_class($this)."::delete Check if we can remove discount", LOG_DEBUG);
			$resql = $this->db->query($sql);
			if ($resql)
			{
				$obj = $this->db->fetch_object($resql);
				if ($obj->nb > 0)
				{
					$this->error = 'ErrorThisPartOrAnotherIsAlreadyUsedSoDiscountSerieCantBeRemoved';
					return -2;
				}
			} else {
				dol_print_error($this->db);
				return -1;
			}
		}

		$this->db->begin();

		// Delete but only if not used
		$sql = "DELETE FROM ".MAIN_DB_PREFIX."societe_remise_except ";
		if ($this->fk_facture_source) $sql .= " WHERE fk_facture_source = ".$this->fk_facture_source; // Delete all lines of same serie
		elseif ($this->fk_invoice_supplier_source) $sql .= " WHERE fk_invoice_supplier_source = ".$this->fk_invoice_supplier_source; // Delete all lines of same serie
		else $sql .= " WHERE rowid = ".$this->id; // Delete only line
		$sql .= " AND (fk_facture_line IS NULL"; // Not used as absolute simple discount
		$sql .= " AND fk_facture IS NULL)"; // Not used as credit note and not used as deposit
		$sql .= " AND (fk_invoice_supplier_line IS NULL"; // Not used as absolute simple discount
		$sql .= " AND fk_invoice_supplier IS NULL)"; // Not used as credit note and not used as deposit

		dol_syslog(get_class($this)."::delete Delete discount", LOG_DEBUG);
		$result = $this->db->query($sql);
		if ($result)
		{
			// If source of discount was a credit note or deposit, we change source statut.
			if ($this->fk_facture_source)
			{
				$sql = "UPDATE ".MAIN_DB_PREFIX."facture";
				$sql .= " set paye=0, fk_statut=1";
				$sql .= " WHERE (type = 2 or type = 3) AND rowid=".$this->fk_facture_source;

				dol_syslog(get_class($this)."::delete Update credit note or deposit invoice statut", LOG_DEBUG);
				$result = $this->db->query($sql);
				if ($result)
				{
					$this->db->commit();
					return 1;
				} else {
					$this->error = $this->db->lasterror();
					$this->db->rollback();
					return -1;
				}
			} elseif ($this->fk_invoice_supplier_source) {
				$sql = "UPDATE ".MAIN_DB_PREFIX."facture_fourn";
				$sql .= " set paye=0, fk_statut=1";
				$sql .= " WHERE (type = 2 or type = 3) AND rowid=".$this->fk_invoice_supplier_source;

				dol_syslog(get_class($this)."::delete Update credit note or deposit invoice statut", LOG_DEBUG);
				$result = $this->db->query($sql);
				if ($result)
				{
					$this->db->commit();
					return 1;
				} else {
					$this->error = $this->db->lasterror();
					$this->db->rollback();
					return -1;
				}
			} else {
				$this->db->commit();
				return 1;
			}
		} else {
			$this->error = $this->db->lasterror();
			$this->db->rollback();
			return -1;
		}
	}



	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Link the discount to a particular invoice line or a particular invoice.
	 *	When discount is a global discount used as an invoice line, we link using rowidline.
	 *	When discount is from a credit note used to reduce payment of an invoice, we link using rowidinvoice
	 *
	 *	@param		int		$rowidline		Invoice line id (To use discount into invoice lines)
	 *	@param		int		$rowidinvoice	Invoice id (To use discount as a credit note to reduc payment of invoice)
	 *	@return		int						<0 if KO, >0 if OK
	 */
	public function link_to_invoice($rowidline, $rowidinvoice)
	{
		// phpcs:enable
		// Check parameters
		if (!$rowidline && !$rowidinvoice)
		{
			$this->error = 'ErrorBadParameters';
			return -1;
		}
		if ($rowidline && $rowidinvoice)
		{
			$this->error = 'ErrorBadParameters';
			return -2;
		}

		$sql = "UPDATE ".MAIN_DB_PREFIX."societe_remise_except";
		if (!empty($this->discount_type)) {
			if ($rowidline)    $sql .= " SET fk_invoice_supplier_line = ".$rowidline;
			if ($rowidinvoice) $sql .= " SET fk_invoice_supplier = ".$rowidinvoice;
		} else {
			if ($rowidline)    $sql .= " SET fk_facture_line = ".$rowidline;
			if ($rowidinvoice) $sql .= " SET fk_facture = ".$rowidinvoice;
		}
		$sql .= " WHERE rowid = ".$this->id;

		dol_syslog(get_class($this)."::link_to_invoice", LOG_DEBUG);
		$resql = $this->db->query($sql);
		if ($resql)
		{
			if (!empty($this->discount_type)) {
				$this->fk_invoice_supplier_line = $rowidline;
				$this->fk_invoice_supplier = $rowidinvoice;
			} else {
				$this->fk_facture_line = $rowidline;
				$this->fk_facture = $rowidinvoice;
			}
			return 1;
		} else {
			$this->error = $this->db->error();
			return -3;
		}
	}


	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Link the discount to a particular invoice line or a particular invoice.
	 *	Do not call this if discount is linked to a reconcialiated invoice
	 *
	 *	@return		int							<0 if KO, >0 if OK
	 */
	public function unlink_invoice()
	{
		// phpcs:enable
		$sql = "UPDATE ".MAIN_DB_PREFIX."societe_remise_except";
		if (!empty($this->discount_type)) {
			$sql .= " SET fk_invoice_supplier_line = NULL, fk_invoice_supplier = NULL";
		} else {
			$sql .= " SET fk_facture_line = NULL, fk_facture = NULL";
		}
		$sql .= " WHERE rowid = ".$this->id;

		dol_syslog(get_class($this)."::unlink_invoice", LOG_DEBUG);
		$resql = $this->db->query($sql);
		if ($resql)
		{
			return 1;
		} else {
			$this->error = $this->db->error();
			return -3;
		}
	}


	/**
	 *  Return amount (with tax) of discounts currently available for a company, user or other criteria
	 *
	 *	@param		Societe		$company		Object third party for filter
	 *	@param		User		$user			Filtre sur un user auteur des remises
	 * 	@param		string		$filter			Filtre autre
	 * 	@param		int			$maxvalue		Filter on max value for discount
	 *  @param      int			$discount_type  0 => customer discount, 1 => supplier discount
	 *  @param      int			$multicurrency  Return multicurrency_amount instead of amount
	 * 	@return		int						<0 if KO, amount otherwise
	 */
	public function getAvailableDiscounts($company = '', $user = '', $filter = '', $maxvalue = 0, $discount_type = 0, $multicurrency = 0)
	{
		global $conf;

		dol_syslog(get_class($this)."::getAvailableDiscounts discount_type=".$discount_type, LOG_DEBUG);

		$sql = "SELECT SUM(rc.amount_ttc) as amount, SUM(rc.multicurrency_amount_ttc) as multicurrency_amount";
		$sql .= " FROM ".MAIN_DB_PREFIX."societe_remise_except as rc";
		$sql .= " WHERE rc.entity = ".$conf->entity;
		$sql .= " AND rc.discount_type=".intval($discount_type);
		if (!empty($discount_type)) {
			$sql .= " AND (rc.fk_invoice_supplier IS NULL AND rc.fk_invoice_supplier_line IS NULL)"; // Available from supplier
		} else {
			$sql .= " AND (rc.fk_facture IS NULL AND rc.fk_facture_line IS NULL)"; // Available to customer
		}
		if (is_object($company)) $sql .= " AND rc.fk_soc = ".$company->id;
		if (is_object($user))    $sql .= " AND rc.fk_user = ".$user->id;
		if ($filter)   $sql .= ' AND ('.$filter.')';
		if ($maxvalue) $sql .= ' AND rc.amount_ttc <= '.price2num($maxvalue);

		$resql = $this->db->query($sql);
		if ($resql)
		{
			$obj = $this->db->fetch_object($resql);
			//while ($obj)
			//{
			//print 'zz'.$obj->amount;
			//$obj = $this->db->fetch_object($resql);
			//}
			if ($multicurrency)
			{
				return $obj->amount_multicurrency;
			}

			return $obj->amount;
		}
		return -1;
	}


	/**
	 *  Return amount (with tax) of all deposits invoices used by invoice as a payment.
	 *  Should always be empty, except if option FACTURE_DEPOSITS_ARE_JUST_PAYMENTS is on (not recommended).
	 *
	 *	@param		CommonInvoice	$invoice		Object invoice (customer of supplier)
	 *  @param 		int 		    $multicurrency 	1=Return multicurrency_amount instead of amount
	 *	@return		int				     			<0 if KO, Sum of credit notes and deposits amount otherwise
	 */
	public function getSumDepositsUsed($invoice, $multicurrency = 0)
	{
		dol_syslog(get_class($this)."::getSumDepositsUsed", LOG_DEBUG);

		if ($invoice->element == 'facture' || $invoice->element == 'invoice')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc, '.MAIN_DB_PREFIX.'facture as f';
			$sql .= ' WHERE rc.fk_facture_source=f.rowid AND rc.fk_facture = '.$invoice->id;
			$sql .= ' AND f.type = 3';
		} elseif ($invoice->element == 'invoice_supplier')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc, '.MAIN_DB_PREFIX.'facture_fourn as f';
			$sql .= ' WHERE rc.fk_invoice_supplier_source=f.rowid AND rc.fk_invoice_supplier = '.$invoice->id;
			$sql .= ' AND f.type = 3';
		} else {
			$this->error = get_class($this)."::getSumDepositsUsed was called with a bad object as a first parameter";
			dol_print_error($this->error);
			return -1;
		}

		$resql = $this->db->query($sql);
		if ($resql)
		{
			$obj = $this->db->fetch_object($resql);
			if ($multicurrency == 1) return $obj->multicurrency_amount;
			else return $obj->amount;
		} else {
			$this->error = $this->db->lasterror();
			return -1;
		}
	}

	/**
	 *  Return amount (with tax) of all credit notes invoices + excess received used by invoice as a payment
	 *
	 *	@param      CommonInvoice	  $invoice	    	Object invoice
	 *	@param      int			      $multicurrency	1=Return multicurrency_amount instead of amount
	 *	@return     int					        		<0 if KO, Sum of credit notes and excess received amount otherwise
	 */
	public function getSumCreditNotesUsed($invoice, $multicurrency = 0)
	{
		dol_syslog(get_class($this)."::getSumCreditNotesUsed", LOG_DEBUG);

		if ($invoice->element == 'facture' || $invoice->element == 'invoice')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc, '.MAIN_DB_PREFIX.'facture as f';
			$sql .= ' WHERE rc.fk_facture_source=f.rowid AND rc.fk_facture = '.$invoice->id;
			$sql .= ' AND f.type IN ('.$invoice::TYPE_STANDARD.', '.$invoice::TYPE_CREDIT_NOTE.', '.$invoice::TYPE_SITUATION.')'; // Find discount coming from credit note or excess received
		} elseif ($invoice->element == 'invoice_supplier')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc, '.MAIN_DB_PREFIX.'facture_fourn as f';
			$sql .= ' WHERE rc.fk_invoice_supplier_source=f.rowid AND rc.fk_invoice_supplier = '.$invoice->id;
			$sql .= ' AND f.type IN ('.$invoice::TYPE_STANDARD.', '.$invoice::TYPE_CREDIT_NOTE.')'; // Find discount coming from credit note or excess paid
		} else {
			$this->error = get_class($this)."::getSumCreditNotesUsed was called with a bad object as a first parameter";
			dol_print_error($this->error);
			return -1;
		}

		$resql = $this->db->query($sql);
		if ($resql)
		{
			$obj = $this->db->fetch_object($resql);
			if ($multicurrency == 1) return $obj->multicurrency_amount;
			else return $obj->amount;
		} else {
			$this->error = $this->db->lasterror();
			return -1;
		}
	}
	/**
	 *    	Return amount (with tax) of all converted amount for this credit note
	 *
	 *	@param		CommonInvoice	  $invoice	    	Object invoice
	 *	@param		int			      $multicurrency	Return multicurrency_amount instead of amount
	 *	@return		int					        		<0 if KO, Sum of credit notes and deposits amount otherwise
	 */
	public function getSumFromThisCreditNotesNotUsed($invoice, $multicurrency = 0)
	{
		dol_syslog(get_class($this)."::getSumCreditNotesUsed", LOG_DEBUG);

		if ($invoice->element == 'facture' || $invoice->element == 'invoice')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc';
			$sql .= ' WHERE rc.fk_facture IS NULL AND rc.fk_facture_source = '.$invoice->id;
		} elseif ($invoice->element == 'invoice_supplier')
		{
			$sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
			$sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc';
			$sql .= ' WHERE rc.fk_invoice_supplier IS NULL AND rc.fk_invoice_supplier_source = '.$invoice->id;
		} else {
			$this->error = get_class($this)."::getSumCreditNotesUsed was called with a bad object as a first parameter";
			dol_print_error($this->error);
			return -1;
		}

		$resql = $this->db->query($sql);
		if ($resql)
		{
			$obj = $this->db->fetch_object($resql);
			if ($multicurrency) return $obj->multicurrency_amount;
			else return $obj->amount;
		} else {
			$this->error = $this->db->lasterror();
			return -1;
		}
	}

	/**
	 *  Return clickable ref of object (with picto or not)
	 *
	 *  @param		int		$withpicto		0=No picto, 1=Include picto into link, 2=Picto only
	 *  @param		string	$option			Where to link to ('invoice' or 'discount')
	 *  @return		string					String with URL
	 */
	public function getNomUrl($withpicto, $option = 'invoice')
	{
		global $langs;

		$result = '';
		$link = '';
		$linkend = '';
		$label = '';
		$picto = '';
		$ref = '';

		if ($option == 'invoice') {
			$facid = !empty($this->discount_type) ? $this->fk_invoice_supplier_source : $this->fk_facture_source;
			$link = !empty($this->discount_type) ? '/fourn/facture/card.php' : '/compta/facture/card.php';
			$label = $langs->trans("ShowSourceInvoice").': '.$this->ref_facture_source;
			$link = '<a href="'.DOL_URL_ROOT.$link.'?facid='.$facid.'" title="'.dol_escape_htmltag($label, 1).'" class="classfortooltip">';
			$linkend = '</a>';
			$ref = !empty($this->discount_type) ? $this->ref_invoice_supplier_source : $this->ref_facture_source;
			$picto = 'bill';
		}
		if ($option == 'discount') {
			$label = $langs->trans("Discount");
			$link = '<a href="'.DOL_URL_ROOT.'/comm/remx.php?id='.$this->fk_soc.'" title="'.dol_escape_htmltag($label, 1).'" class="classfortooltip">';
			$linkend = '</a>';
			$ref = $langs->trans("Discount");
			$picto = 'generic';
		}


		if ($withpicto) $result .= ($link.img_object($label, $picto, 'class="classfortooltip"').$linkend);
		if ($withpicto && $withpicto != 2) $result .= ' ';
		$result .= $link.$ref.$linkend;
		return $result;
	}


	/**
	 *  Initialise an instance with random values.
	 *  Used to build previews or test instances.
	 *	id must be 0 if object instance is a specimen.
	 *
	 *  @return	void
	 */
	public function initAsSpecimen()
	{
		global $user, $langs, $conf;

		$this->fk_soc         = 1;
		$this->amount_ht      = 10;
		$this->amount_tva     = 1.96;
		$this->amount_ttc     = 11.96;
		$this->tva_tx         = 19.6;
		$this->description    = 'Specimen discount';
	}
}
