<?php
/**
 * AgileBill - Open Billing Software
 *
 * This body of work is free software; you can redistribute it and/or
 * modify it under the terms of the Open AgileBill License
 * License as published at http://www.agileco.com/agilebill/license1-4.txt
 *
 * Originally authored by Tony Landis, AgileBill LLC
 *
 * Recent modifications by Deon George
 *
 * @author Deon George <deonATleenooksDOTnet>
 * @copyright 2009 Deon George
 * @link http://osb.leenooks.net
 *
 * @link http://www.agileco.com/
 * @copyright 2004-2008 Agileco, LLC.
 * @license http://www.agileco.com/agilebill/license1-4.txt
 * @author Tony Landis <tony@agileco.com>
 * @package AgileBill
 * @subpackage Modules:Tax
 */

/**
 * The main AgileBill Tax Class
 *
 * @package AgileBill
 * @subpackage Modules:Tax
 */
class tax extends OSB_module {
	/**
	 * Calculate all applicable taxes for a given product
	 * @return Array
	 */
	public function calculate($taxable_amount,$country_id,$zone) {
		$db = &DB();
		$arr = array();

		$result = $db->Execute(
			sqlSelect($db,'tax','id,description,rate',
				sprintf("(zone='' OR zone IS NULL OR zone=::*:: OR zone=::%s::) AND (country_id=::%s:: OR country_id='' OR country_id IS NULL)",$zone,$country_id),
				'zone'));

		if (! $result || ! $result->RecordCount())
			return false;

		else
			while (! $result->EOF) {
				array_push($arr,
					array('rate'=>round($result->fields['rate']*$taxable_amount,2),
						'name' => $result->fields['description'],
						'id' => $result->fields['id']));

				$result->MoveNext();
			}

		return count($arr) ? $arr : false;
	}

	/**
	 * Insert invoice_item_tax Records
	 */
	public function invoice_item($invoice_id,$invoice_item_id,$account_id,$tax_arr) {
		$db = &DB();

		if (! is_array($tax_arr))
			return false;

		foreach ($tax_arr as $tax)
			$db->Execute(sqlInsert($db,'invoice_item_tax',array('date_orig'=>time(),'invoice_id'=>$invoice_id,'invoice_item_id'=>$invoice_item_id,'account_id'=>$account_id,'tax_id'=>$tax['id'],'amount'=>$tax['rate'])));
	}

	/**
	 * Generate the HTML for tax id collection on account creation/update form
	 */
	public function get_tax_ids() {
		$db = &DB();

		$rs = $db->Execute(sqlSelect($db,'tax','*',array('tax_id_collect'=>1,'zone'=>'*')));

		if ($rs && $rs->RecordCount()) {
			while (! $rs->EOF) {
				$arr[$rs->fields['tax_id_name']] = $rs->fields;
				$rs->MoveNext();
			}

		} else {
			return false;
		}

		$ret = array();
		foreach ($arr as $val)
			array_push($ret,$val);

		global $smarty;
		$smarty->assign('tax_ids',$ret);
	}

	/**
	 * Validate inputted tax id on account addition/update
	 */
	function TaxIdsValidate($country_id, $tax_id, $exempt=false) {
		$db = &DB();

		$rs = $db->Execute(sqlSelect($db,'tax','*',array('country_id'=>$country_id,'zone'=>'*','tax_id_collect'=>1,'tax_id_req'=>1)));

		if ($rs && $rs->RecordCount()) {
			$this->errField = $rs->fields['tax_id_name'];

			if (empty($tax_id))
				if ($rs->fields['tax_id_exempt'] && $exempt)
					return true;
				else
					return false;

			if (! empty($rs->fields['tax_id_regex'])) {
				$regex = $rs->fields['tax_id_regex'];

				if (! preg_match("/$regex/",trim($tax_id)))
					return false;
			}
		}

		return true;
	}
}
?>