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Add meta box to post edit for products, calculate gross margin, markup
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@1bigidea
1bigidea committed May 2, 2013
1 parent dd0afe4 commit 3628305
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<?php
/*
Plugin Name: WPSC Simple Margins
Plugin URI: http://geek.1bigidea.com/
Description: Extends WP-e-commerce with product cost to calculate gross margins from product sales
Version: 1.0
Author: Tom Ransom
Author URI: http://1bigidea.com
Network Only: false
Copyright 2013 Tom Ransom (email: transom@1bigidea.com)
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

class onebigidea_WPSC_SimpleMargins {
private static $_this;
var $plugin_slug = "onebigidea_WPSC_SimpleMargins";
var $plugin_name = "WPSC Simple Margins";
var $plugin_version = "1.0";

function __construct() {

register_activation_hook( __FILE__, array( __CLASS__, 'activate' ) );
register_deactivation_hook( __FILE__, array( __CLASS__, 'deactivate' ) );

add_action('init', array($this, 'init'));

}
function __destruct(){
}
function activate() {
// Add options, initiate cron jobs here
register_uninstall_hook( __FILE__, array( __CLASS__, 'uninstall' ) );
}
function deactivate() {
// Remove cron jobs here
}
function uninstall() {
// Delete options here
}
static function this(){
// enables external management of filters/actions
// http://hardcorewp.com/2012/enabling-action-and-filter-hook-removal-from-class-based-wordpress-plugins/
// enables external management of filters/actions
// http://hardcorewp.com/2012/enabling-action-and-filter-hook-removal-from-class-based-wordpress-plugins/
// http://7php.com/how-to-code-a-singleton-design-pattern-in-php-5/
if( !is_object(self::$_this) ) self::$_this = new onebigidea_WPSC_SimpleMargins();

return self::$_this;
}
/*
* Functions below actually do the work
*/
function init(){
add_action( 'admin_init', array($this, 'add_metabox_controls') );
}

function add_metabox_controls(){
add_meta_box( 'simplemargin_form', __('Cost of Goods', 'wpsc'), array($this, 'margin_input_box'), 'wpsc-product', 'side', 'low' );
}
function margin_input_box(){
global $post, $wpdb, $variations_processor, $wpsc_product_defaults;
$product_data = get_post_custom( $post->ID );
$product_data['meta'] = maybe_unserialize( $product_data );

$price = $product_data['meta']['_wpsc_price'][0];
$cogs = (empty($product_data['meta']['_wpsc_cogs'])) ? '' : $product_data['meta']['_wpsc_cogs'][0];
if( !empty($cogs) ){
$markup = self::markup($cogs, $price);
$gross_margin = self::gross_margin($cogs, $price);
}
?>
<?php /* Check product if a product has variations */ ?>
<?php if ( wpsc_product_has_children( $post->ID ) ) : ?>
<?php $cogs = self::wpsc_product_cogs_price_from( $post->ID ); ?>
<p><?php printf( __( 'This Product has variations, to edit the COG please use the <a href="%s">Variation Controls</a>.' , 'wpsc' ), '#wpsc_product_variation_forms' ); ?></p>
<p><?php printf( __( 'Cost: %s and above.' , 'wpsc' ) , $cogs ); ?></p>
<?php else: ?>
<div class='wpsc_floatleft'>
<label><?php esc_html_e( 'Cost of Goods', 'wpsc-simple-margins' ); ?>:</label><br />
<input type="text" class="text" size='10' name="meta[_wpsc_cogs]" value="<?php echo esc_attr( wpsc_format_number($cogs) ); ?>" />
<br style="clear:both" />
<?php printf('%.2f%% %s', $gross_margin, __('Gross Margin', 'wpsc-simple-margins')); ?><br style="clear:both" />
<?php printf('%.2f%% %s', $markup, __('Markup', 'wpsc-simple-margins')); ?><br style="clear:both" />
</div>
<br style="clear:both" />
<br style="clear:both" />
<?php
endif;
}
/**
* WPSC Product Variation Price From
* Gets the formatted lowest price of a product's variations.
*
* @since 3.8.10
*
* @param $product_id (int) Product ID
* @param $args (array) Array of options
* @return (string) Number formatted price
*
* @uses apply_filters() Calls 'wpsc_do_convert_price' passing price and product ID.
* @uses wpsc_currency_display() Passing price and args.
*/
function wpsc_product_cogs_price_from( $product_id, $args = null ) {
global $wpdb;
$args = wp_parse_args( $args, array(
'from_text' => false,
'only_normal_price' => false,
'only_in_stock' => false
) );

static $price_data = array();

if ( isset( $price_data[$product_id] ) ) {
$results = $price_data[$product_id];
} else {
$stock_sql = '';
if ( $args['only_in_stock'] )
$stock_sql = "INNER JOIN {$wpdb->postmeta} AS pm3 ON pm3.post_id = p.id AND pm3.meta_key = '_wpsc_stock' AND pm3.meta_value != '0'";
$sql = $wpdb->prepare( "
SELECT pm.meta_value AS price
FROM {$wpdb->posts} AS p
INNER JOIN {$wpdb->postmeta} AS pm ON pm.post_id = p.id AND pm.meta_key = '_wpsc_cogs'
$stock_sql
WHERE p.post_type = 'wpsc-product'
AND p.post_parent = %d
", $product_id );

$results = $wpdb->get_results( $sql );
$price_data[$product_id] = $results;
}

$prices = wp_list_pluck($results, 'price');

sort( $prices );
if ( empty( $prices ) )
$prices[] = 0;
$price = apply_filters( 'wpsc_do_convert_price', $prices[0], $product_id );
$price = wpsc_currency_display( $price, array( 'display_as_html' => false ) );

if ( isset( $prices[0] ) && $prices[0] == $prices[count( $prices ) - 1] )
$args['from_text'] = false;

if ( $args['from_text'] )
$price = sprintf( $args['from_text'], $price );

return $price;
}

function gross_margin($cost, $price){
return round(($price - $cost) / $price, 2) * 100;
}
function markup($cost, $price){
return round(($price - $cost) / $cost, 2) * 100;
}
}
new onebigidea_WPSC_SimpleMargins();


if ( ! class_exists( 'Autoload_WP' ) ) {
/**
* Generic autoloader for classes named in WordPress coding style.
*/
class Autoload_WP {

public $dir = __DIR__;

function __construct( $dir = '' ) {

if ( ! empty( $dir ) )
$this->dir = $dir;

spl_autoload_register( array( $this, 'spl_autoload_register' ) );
}

function spl_autoload_register( $class_name ) {

$class_path = $this->dir . '/class-' . strtolower( str_replace( '_', '-', $class_name ) ) . '.php';

if ( file_exists( $class_path ) )
include $class_path;
}
}
}

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