sunnysideup / silverstripe-ecommerce_stockcontrol

code/modifiers/MinMaxModifier.php

<?php

/**
 * @author Nicolaas [at] sunnysideup.co.nz
 * @package: ecommerce
 * @sub-package: ecommerce_stockcontrol
 * @description: makes sure that a buyable quantity in cart stays between a min and a max
 */
class MinMaxModifier extends OrderModifier

PSR1 recommends that each class must be in a namespace of at least one level to avoid collisions.

{

//--------------------------------------------------------------------*** static variables

    private static $db = array(
        "Adjustments" => "HTMLText"
    );

    private static $singular_name = "Stock Adjustment";
    public function i18n_singular_name()
    {
        self::$singular_name;
    }

    private static $plural_name = "Stock Adjustments";
    public function i18n_plural_name()
    {
        return self::$plural_name;
    }

    private static $title = "MinMaxModifier";

    private static $default_min_quantity = 1;

    private static $default_max_quantity = 9999;

    private static $min_field = "MinQuantity";

    private static $max_field = "MaxQuantity";

    private static $adjustment_message = "Based on stock availability, quantities have been adjusted as follows: ";

    private static $sorry_message = "Sorry, your selected value not is available.";

    private static $use_stock_quantities = true;

    private static $ids_of_items_adjusted = array();

//-------------------------------------------------------------------- *** static functions

    public static function show_form()
    {
        self::apply_min_max();
        return false;
    }

    public static function get_form($controller)
    {
        return false;
    }

//-------------------------------------------------------------------- *** cms fuctions

    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        $fields->removeByName("Adjustments");
        $fields->addFieldToTab("Root.Debug", new ReadonlyField("AdjustmentsShown", "Adjustments", $this->Adjustments));
        return $fields;
    }
//-------------------------------------------------------------------- *** display functions
    public function CanBeRemoved()
    {
        return false;
    }

    public function ShowInTable()
    {
        return false;
    }


//--------------------------------------------------------------------*** table values
    public function LiveCalculatedTotal()
    {
        self::apply_min_max();
        return 0;
    }

    public function LiveTableValue()
    {
        return "";
    }


//--------------------------------------------------------------------*** table titles
    public function LiveName()
    {
        return "";
    }

//-------------------------------------------------------------------- *** calculations
    public static function apply_min_max()
    {
        if (self::$min_field || self::$max_field  || self::$default_min_quantity || self::$default_max_quantity) {
            $msgArray = array();
            $minFieldName = self::$min_field;
            $maxFieldName = self::$max_field;
            $currentOrder = ShoppingCart::current_order();
            if ($currentOrder->IsSubmitted()) {
                //too late!
                return;
            }
            $items = $currentOrder->Items();
            $i = 0;
            if ($items) {
                foreach ($items as $item) {
                    $buyable = $item->Buyable();
                    if ($buyable) {
                        $quantity = $item->Quantity;
                        $absoluteMin = self::$default_min_quantity;
                        $absoluteMax = self::$default_max_quantity;
                        $parent = $buyable->Parent();
                        if ($minFieldName) {
                            if (isset($buyable->$minFieldName) && $buyable->$minFieldName > 0) {
                                $absoluteMin = $buyable->$minFieldName;
                            }
                            //product variations
                            elseif (!isset($buyable->$minFieldName)) {
                                if ($parent && isset($parent->$minFieldName) && $parent->$minFieldName > 0) {
                                    $absoluteMin = $parent->$minFieldName;
                                }
                            }
                        }
                        if ($maxFieldName) {
                            if (isset($buyable->$maxFieldName) && $buyable->$maxFieldName > 0) {
                                $absoluteMax = $buyable->$maxFieldName;
                            }
                            //product variations
                            elseif (!isset($buyable->$maxFieldName)) {
                                if ($parent && isset($parent->$maxFieldName) && $parent->$maxFieldName > 0) {
                                    $absoluteMax = $parent->$maxFieldName;
                                }
                            }
                        }
                        if ($buyable->UnlimitedStock) {
                            //nothing more to do
                        } elseif (self::$use_stock_quantities) {
                            $maxStockQuantity = $buyable->getActualQuantity();
                            if ($absoluteMax > $maxStockQuantity) {
                                $absoluteMax = $maxStockQuantity;
                            }
                            if ($absoluteMin > $maxStockQuantity) {
                                $absoluteMax = 0;
                                $maxStockQuantity = 0;
                            }
                        }
                        $absoluteMin = intval($absoluteMin) - 0;
                        $absoluteMax = intval($absoluteMax) - 0;
                        $newValue = $quantity;
                        if ($quantity < $absoluteMin && $absoluteMin > 0) {
                            debug::log("adjusting for MIN: $quantity < $absoluteMin");
                            $newValue = $absoluteMin;
                        }
                        if ($quantity > $absoluteMax && $absoluteMax > 0) {
                            debug::log("adjusting for MAX: $quantity > $absoluteMax");
                            $newValue = $absoluteMax;
                        }
                        if ($quantity != $newValue) {
                            $item->Quantity = $newValue;
                            ShoppingCart::singleton()->setQuantity($buyable, $newValue);
                            $msgArray[$i] = $buyable->Title." changed from ".$quantity." to ".$newValue;
                            $i++;
                            $quantity = $newValue;
                            self::$ids_of_items_adjusted[$item->ID] = $item->ID;
                        }
                        if (Director::is_ajax()) {
                            //do nothing
                        } else {
                            //IS THIS WORKING?
                            $fieldName = $item->AJAXDefinitions()->QuantityFieldName();
                            $js = 'MinMaxModifier.add_item("input[name=\''.$fieldName.'\']", '.intval($absoluteMin).', '.intval($absoluteMax).', "'.addslashes(self::$sorry_message).'");';
                            Requirements::javascript("ecommerce_stockcontrol/javascript/MinMaxModifier.js");
                            Requirements::customScript($js, $fieldName);
                        }
                    }
                }
            }
        }
        if (count($msgArray)) {
            if (self::$adjustment_message) {
                $msg = self::$adjustment_message."\n".implode("\n", $msgArray);
                if ($msg && !Director::is_ajax()) {
                    Requirements::customScript('alert("'.Convert::raw2js($msg).'");', "MinMaxModifierAlert");
                }
                //$this->Adjustments = $msg;
            }
        }
    }

    public function updateForAjax(array $js)
    {
        parent::updateForAjax($js);
        self::apply_min_max();
        if (is_array(self::$ids_of_items_adjusted) && count(self::$ids_of_items_adjusted)) {
            $items = OrderItem::get()->filter(array('ID' => self::$ids_of_items_adjusted));
            if ($items->count()) {
                foreach ($items as $item) {
                    $item->updateForAjax($js);
                }
            }
        }
        return $js;
    }


//--------------------------------------------------------------------*** database functions
}