<?php
/**********************************************************************
    Copyright (C) FrontAccounting, LLC.
	Released under the terms of the GNU General Public License, GPL, 
	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 License here <http://www.gnu.org/licenses/gpl-3.0.html>.
***********************************************************************/
include_once($path_to_root . "/gl/includes/gl_db.inc");

//----------------------------------------------------------------------------------
//	Check if given account is used by any bank_account. 
//	Returns id of first bank_account using account_code, null otherwise.
//
//	Keep in mind that direct posting to bank account is depreciated
//	because we have no way to select right bank account if 
//	there is more than one using given gl account.
//
function is_bank_account($account_code)
{
	$sql= "SELECT id FROM ".TB_PREF."bank_accounts WHERE account_code='$account_code'";
	$result = db_query($sql, "checking account is bank account");
	if (db_num_rows($result) > 0) {
		$acct = db_fetch($result);
		return $acct['id'];
	} else
		return false;
}

//----------------------------------------------------------------------------------

function is_company_currency($currency)
{
	return (get_company_currency() == $currency);
}

//----------------------------------------------------------------------------------

function get_company_currency()
{
	$sql= "SELECT curr_default FROM ".TB_PREF."company";
	$result = db_query($sql, "retreive company currency");

	if (db_num_rows($result) == 0)
		display_db_error("Could not find the requested currency. Fatal.", $sql);

	$myrow = db_fetch_row($result);
	return $myrow[0];
}

//----------------------------------------------------------------------------------

function get_bank_account_currency($id)
{
	$sql= "SELECT bank_curr_code FROM ".TB_PREF."bank_accounts WHERE id='$id'";
	$result = db_query($sql, "retreive bank account currency");

	$myrow = db_fetch_row($result);
	return $myrow[0];
}

//----------------------------------------------------------------------------------

function get_customer_currency($customer_id)
{
    $sql = "SELECT curr_code FROM ".TB_PREF."debtors_master WHERE debtor_no = '$customer_id'";

	$result = db_query($sql, "Retreive currency of customer $customer_id");

	$myrow=db_fetch_row($result);
	return $myrow[0];
}

//----------------------------------------------------------------------------------

function get_supplier_currency($supplier_id)
{
    $sql = "SELECT curr_code FROM ".TB_PREF."suppliers WHERE supplier_id = '$supplier_id'";

	$result = db_query($sql, "Retreive currency of supplier $supplier_id");

	$myrow=db_fetch_row($result);
	return $myrow[0];
}

//----------------------------------------------------------------------------------

function get_exchange_rate_from_home_currency($currency_code, $date_)
{
	if ($currency_code == get_company_currency() || $currency_code == null)
		return 1.0000;

	$date = date2sql($date_);

	$sql = "SELECT rate_buy, max(date_) as date_ FROM ".TB_PREF."exchange_rates WHERE curr_code = '$currency_code'
				AND date_ <= '$date' GROUP BY rate_buy ORDER BY date_ Desc LIMIT 1";

	$result = db_query($sql, "could not query exchange rates");

	if (db_num_rows($result) == 0)
	{
		// no stored exchange rate, just return 1
		display_error(
			sprintf(_("Cannot retrieve exchange rate for currency %s as of %s. Please add exchange rate manually on Exchange Rates page."),
				 $currency_code, $date_));
		return 1.000;
	}

	$myrow = db_fetch_row($result);
	return $myrow[0];
}

//----------------------------------------------------------------------------------

function get_exchange_rate_to_home_currency($currency_code, $date_)
{
	return 1 / get_exchange_rate_from_home_currency($currency_code, $date_);
}

//----------------------------------------------------------------------------------

function to_home_currency($amount, $currency_code, $date_)
{
	$ex_rate = get_exchange_rate_to_home_currency($currency_code, $date_);
	return round2($amount / $ex_rate,  user_price_dec());
}

//----------------------------------------------------------------------------------

function get_exchange_rate_from_to($from_curr_code, $to_curr_code, $date_)
{
//	echo "converting from $from_curr_code to $to_curr_code <BR>";
	if ($from_curr_code == $to_curr_code)
		return 1.0000;

	$home_currency = get_company_currency();
	if ($to_curr_code == $home_currency)
	{
		return get_exchange_rate_to_home_currency($from_curr_code, $date_);
	}

	if ($from_curr_code == $home_currency)
	{
		return get_exchange_rate_from_home_currency($to_curr_code, $date_);
	}

	// neither from or to are the home currency
	 return get_exchange_rate_to_home_currency($from_curr_code, $date_) / get_exchange_rate_to_home_currency($to_curr_code, $date_);
}

//--------------------------------------------------------------------------------

function exchange_from_to($amount, $from_curr_code, $to_curr_code, $date_)
{
	$ex_rate = get_exchange_rate_from_to($from_curr_code, $to_curr_code, $date_);
	return $amount / $ex_rate;
}

//--------------------------------------------------------------------------------
// Exchange Variations Joe Hunt 2008-09-20 ////////////////////////////////////////

function exchange_variation($pyt_type, $pyt_no, $type, $trans_no, $pyt_date, $amount, $person_type, $neg=false)
{
	global $systypes_array;
	
	if ($person_type == PT_CUSTOMER)
	{
		$trans = get_customer_trans($trans_no, $type);
		$pyt_trans = get_customer_trans($pyt_no, $pyt_type);
		$ar_ap_act = $trans['receivables_account'];
		$person_id = $trans['debtor_no'];
		$curr = $trans['curr_code'];
		$date = sql2date($trans['tran_date']);
	}
	else
	{
		$trans = get_supp_trans($trans_no, $type);
		$pyt_trans = get_supp_trans($pyt_no, $pyt_type);
		$supp_accs = get_supplier_accounts($trans['supplier_id']);
		$ar_ap_act = $supp_accs['payable_account'];
		$person_id = $trans['supplier_id'];
		$curr = $trans['SupplierCurrCode'];
		$date = sql2date($trans['tran_date']);
	}
	if (is_company_currency($curr))
		return;
	$inv_amt = round2($amount * $trans['rate'], user_price_dec()); 
	$pay_amt = round2($amount * $pyt_trans['rate'], user_price_dec());
	if ($inv_amt != $pay_amt)
	{
		$diff = $inv_amt - $pay_amt;
		if ($person_type == PT_SUPPLIER)
			$diff = -$diff;
		if ($neg)
			$diff = -$diff;
		$exc_var_act = get_company_pref('exchange_diff_act');
		if (date1_greater_date2($date, $pyt_date))
		{
			$memo = $systypes_array[$pyt_type]." ".$pyt_no;
			add_gl_trans($type, $trans_no, $date, $ar_ap_act, 0, 0, $memo, -$diff, null, $person_type, $person_id);
			add_gl_trans($type, $trans_no, $date, $exc_var_act, 0, 0, $memo, $diff, null, $person_type, $person_id);
		}
		else
		{
			$memo = $systypes_array[$type]." ".$trans_no;
			add_gl_trans($pyt_type, $pyt_no, $pyt_date, $ar_ap_act, 0, 0, $memo, -$diff, null, $person_type, $person_id);
			add_gl_trans($pyt_type, $pyt_no, $pyt_date, $exc_var_act, 0, 0, $memo, $diff, null, $person_type, $person_id);
		}
	}
}

?>