<?php
/**
 * functions_taxes
 *
 * @package functions
 * @copyright Copyright 2003-2006 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: functions_taxes.php 6789 2007-08-24 15:46:37Z drbyte $
 */

////
// Returns the tax rate for a zone / class
// TABLES: tax_rates, zones_to_geo_zones
  function zen_get_tax_rate($class_id, $country_id = -1, $zone_id = -1) {
    global $db;

    if ( ($country_id == -1) && ($zone_id == -1) ) {
      if (isset($_SESSION['customer_id'])) {
        $country_id = $_SESSION['customer_country_id'];
        $zone_id = $_SESSION['customer_zone_id'];
      } else {
        $country_id = STORE_COUNTRY;
        $zone_id = STORE_ZONE;
      }
    }

    if (STORE_PRODUCT_TAX_BASIS == 'Store') {
      if ($zone_id != STORE_ZONE) return 0;
    }

    $tax_query = "select sum(tax_rate) as tax_rate
                  from (" . TABLE_TAX_RATES . " tr
                  left join " . TABLE_ZONES_TO_GEO_ZONES . " za on (tr.tax_zone_id = za.geo_zone_id)
                  left join " . TABLE_GEO_ZONES . " tz on (tz.geo_zone_id = tr.tax_zone_id) )
                  where (za.zone_country_id is null
                  or za.zone_country_id = 0
                  or za.zone_country_id = '" . (int)$country_id . "')
                  and (za.zone_id is null
                  or za.zone_id = 0
                  or za.zone_id = '" . (int)$zone_id . "')
                  and tr.tax_class_id = '" . (int)$class_id . "'
                  group by tr.tax_priority";

    $tax = $db->Execute($tax_query);

    if ($tax->RecordCount() > 0) {
      $tax_multiplier = 1.0;
      while (!$tax->EOF) {
        $tax_multiplier *= 1.0 + ($tax->fields['tax_rate'] / 100);
        $tax->MoveNext();
      }
      return ($tax_multiplier - 1.0) * 100;
    } else {
      return 0;
    }
  }

////
// Return the tax description for a zone / class
// TABLES: tax_rates;
  function zen_get_tax_description($class_id, $country_id = -1, $zone_id = -1) {
    global $db;

    if ( ($country_id == -1) && ($zone_id == -1) ) {
      if (isset($_SESSION['customer_id'])) {
        $country_id = $_SESSION['customer_country_id'];
        $zone_id = $_SESSION['customer_zone_id'];
      } else {
        $country_id = STORE_COUNTRY;
        $zone_id = STORE_ZONE;
      }
    }

    $tax_query = "select tax_description
                  from (" . TABLE_TAX_RATES . " tr
                  left join " . TABLE_ZONES_TO_GEO_ZONES . " za on (tr.tax_zone_id = za.geo_zone_id)
                  left join " . TABLE_GEO_ZONES . " tz on (tz.geo_zone_id = tr.tax_zone_id) )
                  where (za.zone_country_id is null or za.zone_country_id = 0
                  or za.zone_country_id = '" . (int)$country_id . "')
                  and (za.zone_id is null
                  or za.zone_id = 0
                  or za.zone_id = '" . (int)$zone_id . "')
                  and tr.tax_class_id = '" . (int)$class_id . "'
                  order by tr.tax_priority";

    $tax = $db->Execute($tax_query);

    if ($tax->RecordCount() > 0) {
      $tax_description = '';
      while (!$tax->EOF) {
        $tax_description .= $tax->fields['tax_description'] . ' + ';
        $tax->MoveNext();
      }
      $tax_description = substr($tax_description, 0, -3);

      return $tax_description;
    } else {
      return TEXT_UNKNOWN_TAX_RATE;
    }
  }
////
// Return the tax rates for each defined tax for the given class and zone
// @returns array(description => tax_rate)
  function zen_get_multiple_tax_rates($class_id, $country_id, $zone_id, $tax_description=array()) {
    global $db;

    if ( ($country_id == -1) && ($zone_id == -1) ) {
      if (isset($_SESSION['customer_id'])) {
        $country_id = $_SESSION['customer_country_id'];
        $zone_id = $_SESSION['customer_zone_id'];
      } else {
        $country_id = STORE_COUNTRY;
        $zone_id = STORE_ZONE;
      }
    }

    $tax_query = "select tax_description, tax_rate, tax_priority
                  from (" . TABLE_TAX_RATES . " tr
                  left join " . TABLE_ZONES_TO_GEO_ZONES . " za on (tr.tax_zone_id = za.geo_zone_id)
                  left join " . TABLE_GEO_ZONES . " tz on (tz.geo_zone_id = tr.tax_zone_id) )
                  where (za.zone_country_id is null or za.zone_country_id = 0
                  or za.zone_country_id = '" . (int)$country_id . "')
                  and (za.zone_id is null
                  or za.zone_id = 0
                  or za.zone_id = '" . (int)$zone_id . "')
                  and tr.tax_class_id = '" . (int)$class_id . "'
                  order by tr.tax_priority";
    $tax = $db->Execute($tax_query);

    // calculate appropriate tax rate respecting priorities and compounding
    if ($tax->RecordCount() > 0) {
      $tax_aggregate_rate = 1;
      $tax_rate_factor = 1;
      $tax_prior_rate = 1;
      $tax_priority = 0;
      while (!$tax->EOF) {
        if ((int)$tax->fields['tax_priority'] > $tax_priority) {
          $tax_priority = $tax->fields['tax_priority'];
          $tax_prior_rate = $tax_aggregate_rate;
          $tax_rate_factor = 1 + ($tax->fields['tax_rate'] / 100);
          $tax_rate_factor *= $tax_aggregate_rate;
          $tax_aggregate_rate = 1;
        } else {
          $tax_rate_factor = $tax_prior_rate * ( 1 + ($tax->fields['tax_rate'] / 100));
        }
        $rates_array[$tax->fields['tax_description']] = 100 * ($tax_rate_factor - $tax_prior_rate);
        $tax_aggregate_rate += $tax_rate_factor - 1;
        $tax->MoveNext();
      }
    } else {
      // no tax at this level, set rate to 0 and description of unknown
      $rates_array[0] = TEXT_UNKNOWN_TAX_RATE;
    }
    return $rates_array;
  }

////
// Add tax to a products price based on whether we are displaying tax "in" the price
  function zen_add_tax($price, $tax) {
    global $currencies;

    if ( (DISPLAY_PRICE_WITH_TAX == 'true') && ($tax > 0) ) {
      return zen_round($price, $currencies->currencies[DEFAULT_CURRENCY]['decimal_places']) + zen_calculate_tax($price, $tax);
    } else {
      return zen_round($price, $currencies->currencies[DEFAULT_CURRENCY]['decimal_places']);
    }
  }

// Calculates Tax rounding the result
  function zen_calculate_tax($price, $tax) {
    global $currencies;
//    $result = bcmul($price, $tax, $currencies->currencies[DEFAULT_CURRENCY]['decimal_places']);
//    $result = bcdiv($result, 100, $currencies->currencies[DEFAULT_CURRENCY]['decimal_places']);
//    return $result;
    return zen_round($price * $tax / 100, $currencies->currencies[DEFAULT_CURRENCY]['decimal_places']);
  }


////
// Output the tax percentage with optional padded decimals
  function zen_display_tax_value($value, $padding = TAX_DECIMAL_PLACES) {
    if (strpos($value, '.')) {
      $loop = true;
      while ($loop) {
        if (substr($value, -1) == '0') {
          $value = substr($value, 0, -1);
        } else {
          $loop = false;
          if (substr($value, -1) == '.') {
            $value = substr($value, 0, -1);
          }
        }
      }
    }

    if ($padding > 0) {
      if ($decimal_pos = strpos($value, '.')) {
        $decimals = strlen(substr($value, ($decimal_pos+1)));
        for ($i=$decimals; $i<$padding; $i++) {
          $value .= '0';
        }
      } else {
        $value .= '.';
        for ($i=0; $i<$padding; $i++) {
          $value .= '0';
        }
      }
    }

    return $value;
  }

////
// Get tax rate from tax description
 function zen_get_tax_rate_from_desc($tax_desc) {
    global $db;
    $tax_rate = 0.00;

    $tax_descriptions = explode(' + ', $tax_desc);
    foreach ($tax_descriptions as $tax_description) {
      $tax_query = "SELECT tax_rate
                    FROM " . TABLE_TAX_RATES . "
                    WHERE tax_description = :taxDescLookup";
      $tax_query = $db->bindVars($tax_query, ':taxDescLookup', $tax_description, 'string');

      $tax = $db->Execute($tax_query);

      $tax_rate += $tax->fields['tax_rate'];
    }

    return $tax_rate;
  }

 function zen_get_tax_locations($store_country = -1, $store_zone = -1) {
  global $db;
    switch (STORE_PRODUCT_TAX_BASIS) {

      case 'Shipping':
        $tax_address_query = "select ab.entry_country_id, ab.entry_zone_id
                                from " . TABLE_ADDRESS_BOOK . " ab
                                left join " . TABLE_ZONES . " z on (ab.entry_zone_id = z.zone_id)
                                where ab.customers_id = '" . (int)$_SESSION['customer_id'] . "'
                                and ab.address_book_id = '" . (int)$_SESSION['sendto'] . "'";
        $tax_address_result = $db->Execute($tax_address_query);
      break;
      case 'Billing':

        $tax_address_query = "select ab.entry_country_id, ab.entry_zone_id
                                from " . TABLE_ADDRESS_BOOK . " ab
                                left join " . TABLE_ZONES . " z on (ab.entry_zone_id = z.zone_id)
                                where ab.customers_id = '" . (int)$_SESSION['customer_id'] . "'
                                and ab.address_book_id = '" . (int)$_SESSION['billto'] . "'";
        $tax_address_result = $db->Execute($tax_address_query);
      break;
      case 'Store':
        $tax_address_query = "select ab.entry_country_id, ab.entry_zone_id
                                from " . TABLE_ADDRESS_BOOK . " ab
                                left join " . TABLE_ZONES . " z on (ab.entry_zone_id = z.zone_id)
                                where ab.customers_id = '" . (int)$_SESSION['customer_id'] . "'
                                and ab.address_book_id = '" . (int)$_SESSION['billto'] . "'";
        $tax_address_result = $db->Execute($tax_address_query);

        if ($tax_address_result ->fields['entry_zone_id'] == STORE_ZONE) {

        } else {
          $tax_address_query = "select ab.entry_country_id, ab.entry_zone_id
                                  from " . TABLE_ADDRESS_BOOK . " ab
                                  left join " . TABLE_ZONES . " z on (ab.entry_zone_id = z.zone_id)
                                  where ab.customers_id = '" . (int)$_SESSION['customer_id'] . "'
                                  and ab.address_book_id = '" . (int)$_SESSION['sendto'] . "'";
        $tax_address_result = $db->Execute($tax_address_query);
       }
     }
     $tax_address['zone_id'] = $tax_address_result->fields['entry_zone_id'];
     $tax_address['country_id'] = $tax_address_result->fields['entry_country_id'];
     return $tax_address;
 }
?>