<?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>.
***********************************************************************/
function add_tax_type($name, $sales_gl_code, $purchasing_gl_code, $rate)
{
	$sql = "INSERT INTO ".TB_PREF."tax_types (name, sales_gl_code, purchasing_gl_code, rate)
		VALUES (".db_escape($name).", ".db_escape($sales_gl_code)
		.", ".db_escape($purchasing_gl_code).", $rate)";

	db_query($sql, "could not add tax type");
}

function update_tax_type($type_id, $name, $sales_gl_code, $purchasing_gl_code, $rate)
{
	$sql = "UPDATE ".TB_PREF."tax_types SET name=".db_escape($name).",
		sales_gl_code=".db_escape($sales_gl_code).",
		purchasing_gl_code=".db_escape($purchasing_gl_code).",
		rate=$rate
		WHERE id=".db_escape($type_id);

	db_query($sql, "could not update tax type");
}

function get_all_tax_types($all=false)
{
	$sql = "SELECT tax_type.*,
				Chart1.account_name AS SalesAccountName,
				Chart2.account_name AS PurchasingAccountName
			FROM ".TB_PREF."tax_types tax_type,"
				.TB_PREF."chart_master AS Chart1,"
				.TB_PREF."chart_master AS Chart2
			WHERE tax_type.sales_gl_code = Chart1.account_code
				AND tax_type.purchasing_gl_code = Chart2.account_code";

	if (!$all) $sql .= " AND !tax_type.inactive";
	return db_query($sql, "could not get all tax types");
}

function get_all_tax_types_simple()
{
	$sql = "SELECT * FROM ".TB_PREF."tax_types WHERE !inactive";

	return db_query($sql, "could not get all tax types");
}

function get_tax_type($type_id)
{
	$sql = "SELECT tax_type.*,
				Chart1.account_name AS SalesAccountName,
				Chart2.account_name AS PurchasingAccountName
			FROM ".TB_PREF."tax_types tax_type,"
				.TB_PREF."chart_master AS Chart1,"
				.TB_PREF."chart_master AS Chart2
			WHERE tax_type.sales_gl_code = Chart1.account_code
		AND tax_type.purchasing_gl_code = Chart2.account_code AND id=".db_escape($type_id);

	$result = db_query($sql, "could not get tax type");
	return db_fetch($result);
}

function get_tax_type_rate($type_id)
{
	$sql = "SELECT rate FROM ".TB_PREF."tax_types WHERE id=".db_escape($type_id);

	$result = db_query($sql, "could not get tax type rate");

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

function delete_tax_type($type_id)
{
	begin_transaction();

	$sql = "DELETE FROM ".TB_PREF."tax_types WHERE id=".db_escape($type_id);

	db_query($sql, "could not delete tax type");

	// also delete any item tax exemptions associated with this type
	$sql = "DELETE FROM ".TB_PREF."item_tax_type_exemptions WHERE tax_type_id=".db_escape($type_id);

	db_query($sql, "could not delete item tax type exemptions");

	commit_transaction();
}

/*
	Check if gl_code is used by more than 2 tax types,
	or check if the two gl codes are not used by any other 
	than selected tax type.
	Necessary for pre-2.2 installations.
*/
function is_tax_gl_unique($gl_code, $gl_code2=-1, $selected_id=-1) {

	$purch_code = $gl_code2== -1 ? $gl_code : $gl_code2;

	$sql = "SELECT count(*) FROM "
			.TB_PREF."tax_types	
		WHERE (sales_gl_code=" .db_escape($gl_code)
			." OR purchasing_gl_code=" .db_escape($purch_code). ")";

	if ($selected_id != -1)
		$sql .= " AND id!=".db_escape($selected_id);

	$res = db_query($sql, "could not query gl account uniqueness");
	$row = db_fetch($res);

	return $gl_code2 == -1 ? ($row[0] <= 1) : ($row[0] == 0);
}

function is_tax_account($account_code)
{
	$sql= "SELECT id FROM ".TB_PREF."tax_types WHERE 
		sales_gl_code=".db_escape($account_code)." OR purchasing_gl_code=".db_escape($account_code);
	$result = db_query($sql, "checking account is tax account");
	if (db_num_rows($result) > 0) {
		$acct = db_fetch($result);
		return $acct['id'];
	} else
		return false;
}