<?php

class Orange35_CustomInvoicesGenerator_Model_Order extends Mage_Core_Model_Abstract
{
    const DEFAULT_CODE_LENGTH        = 6;
    const CODE_GENERATION_ITERATIONS = 30;

    protected $_allOrders = array();

    protected function _construct()
    {
        $this->_init('orange35_custominvoicesgenerator/order');
    }

    protected function _beforeSave()
    {
        parent::_beforeSave();
        if ($this->isObjectNew() || !$this->getData('alias')) {
            $this->setData('date', Varien_Date::now());
            $this->setData('alias', $this->generateCode());

        }
        if ($this->isObjectNew()){
            $this->setData('payment_status', 0);
        }
        return $this;
    }

    public function getPaymentsSum()
    {
        return $this->getAmount() - Mage::getModel('orange35_custominvoicesgenerator/invoice')->getPaymentsSum($this->getId());
    }

    protected function generateCode()
    {
        $iterations = self::CODE_GENERATION_ITERATIONS;
        $code       = '';
        $unique     = false;
        while ($unique == false && $iterations > 0) {
            $code = strtoupper(substr(md5(rand() . microtime(true) . rand()), 0, self::DEFAULT_CODE_LENGTH));
            $code = strtoupper($code);
            if ($this->isValid($code)) {
                $unique = true;
            } else {
                $code = '';
            }
            $iterations--;
        }
        return $code;
    }

    protected function isValid($code)
    {
        if (empty($this->_allOrders)) {
            $this->_allOrders = Mage::getModel('orange35_custominvoicesgenerator/order')->getCollection();
        }
        foreach ($this->_allOrders as $order) {
            if ($order->getData('alias') == $code) {
                return false;
            }
        }
        return true;
    }

    public function getLink()
    {
        return Mage::getBaseUrl() . "admin/sales_custom_order/edit/id/" . $this->getId() . "/";
    }
    public function getDescription(){
        return nl2br($this->getData('description'));
    }
}