Mortgage Calculator / Loan Calculator Shortcode

function display_mlcalc($options = array(), $content = null, $code = "") {
	global $mlcalcURL;
	if(!empty($code) || (!empty($options) && !empty($options[0]) && ($options[0] == 'mlcalc'))){
		$shortcode = true;

		// $atts    ::= array of attributes
		// examples: [mlcalc]
		//           [mlcalc default='mortgage' size='narrow']
		extract( shortcode_atts( array(
			// default parameters
			'default' => 'mortgage_only', // mortgage|loan|mortgage_only|loan_only
			'size' => 'wide', // wide|narrow
			'currency' => 'usd', // usd|eur|gbp|ENTER_YOURS
			'rate' => '4.5', // interest rate
			'price' => '300,000', // purchase price
			'mterm' => '30', // mortgage term
			'down' => '20', // downpayment in %
			'tax' => '3,000', // property tax
			'insurance' => '1,500', // property insurance
			'pmi' => '0.52',
			'amount' => '175,000', // loan amount
			'lterm' => '15', // loan term
			'schedule' => 'year_nc', // month|year|month_nc|year_nc|none (_nc stands for "no choice" for visitor)
			'language' => substr(get_bloginfo('language'), 0, 2), // en|de|es|fr|it|pt|ru
		), $options ) );
		
		$default_calculator = $default;
		$form_size          = ($size == 'narrow' ? 'small' : $size);
		$currency_code      = $currency;
		$interest_rate      = $rate;
		$purchase_price     = $price;
		$mortgage_term      = $mterm;
		$down_payment       = $down;
		$property_tax       = $tax;
		$property_insurance = $insurance;
		$pmi                = $pmi;
		$loan_amount        = $amount;
		$loan_term          = $lterm;
		$amortization       = sanitize_text_field($schedule);
	} else {
		$shortcode = false;

		$options = get_option( 'widget_mlcalc' );
		$title              = empty( $options['title'] ) ? __('Loan Calculator') : $options['title'];
		$default_calculator = empty( $options['default_calculator'] ) ? 'loan' : $options['default_calculator'];
		$form_size          = empty( $options['form_size'] ) ? 'small' : $options['form_size'];
		$currency_code      = empty( $options['currency_code'] ) ? 'usd' : $options['currency_code'];
		$interest_rate      = empty( $options['interest_rate'] ) ? '4.5' : $options['interest_rate'];
		$purchase_price     = empty( $options['purchase_price'] ) ? '300,000' : $options['purchase_price'];
		$mortgage_term      = empty( $options['mortgage_term'] ) ? '30' : $options['mortgage_term'];
		$down_payment       = empty( $options['down_payment'] ) ? '10' : $options['down_payment'];
		$property_tax       = empty( $options['property_tax'] ) ? '3,000' : $options['property_tax'];
		$property_insurance = empty( $options['property_insurance'] ) ? '1,500' : $options['property_insurance'];
		$pmi                = empty( $options['pmi'] ) ? '0.52' : $options['pmi'];
		$loan_amount        = empty( $options['loan_amount'] ) ? '175,000' : $options['loan_amount'];
		$loan_term          = empty( $options['loan_term'] ) ? '15' : $options['loan_term'];
		$amortization       = empty( $options['amortization'] ) ? 'year_nc' : $options['amortization'];
		$language           = empty( $options['language'] ) ? substr(get_bloginfo('language'), 0, 2) : $options['language'];
	};

	if($currency_code == 'eur') $currency_symbol = '€';
	if($currency_code == 'gbp') $currency_symbol = '£';
	if($currency_code == 'usd') $currency_symbol = '$';
	if(empty($currency_symbol)) $currency_symbol = substr(sanitize_text_field($currency_code), 0, 3);

    if (!in_array($language, array('en', 'de', 'es', 'fr', 'it', 'pt', 'ru', 'al'))) {
        $language = 'en';
    }

	$display_mortgage_form = $display_loan_form = $display_loan_only = $display_mortgage_only = $display_loan = $display_mortgage = 'style="display:none"';

	switch ($default_calculator){
		case 'mortgage':
			$display_mortgage = $display_mortgage_form = '';
		break;
		case 'loan_only':
			$display_loan_only = $display_loan_form = '';
		break;
		case 'mortgage_only':
			$display_mortgage_only = $display_mortgage_form = '';
		break;
		case 'loan':
		default:
			$display_loan = $display_loan_form = '';
		break;
	}

	$hidden = '';
	$display_amortization = '';

    if (!in_array($amortization, array('month', 'year', 'month_nc', 'year_nc', 'none'))) {
        $amortization = 'year_nc';
    }

	if ((preg_match('/_nc/i', $amortization)) || $amortization == 'none') {
		$display_amortization = 'style="display:none"';
		$hidden .= '<input type="hidden" name="as" value="' . str_replace('_nc', '', $amortization) . '" />';
	}

	$as_year  = (preg_match('/year/i', $amortization)) ? 'checked="checked"' : '';
	$as_month = (preg_match('/month/i', $amortization)) ? 'checked="checked"' : '';
	
	$WL_DIR_PREFIX = $language."/";
	
	// LOAD SCRIPTS
	wp_enqueue_script( 'mlcalc-widget-script', plugins_url($WL_DIR_PREFIX.'widget-nj.js', __FILE__), array('jquery') );
	
	// LOAD STYLES
	wp_register_style( 'mlcalc-form-small-style', plugins_url('widget-form-small.css', __FILE__) );
	wp_register_style( 'mlcalc-form-style', plugins_url('widget-form.css', __FILE__) );
	if($form_size == 'small'){
		wp_enqueue_style( 'mlcalc-form-small-style' );
	} else {
		wp_enqueue_style( 'mlcalc-form-style' );
	}
	
	if($shortcode) ob_start();
	
	echo "<!-- MLCALC BEGIN -->\r\n";
	echo "<script type=\"text/javascript\"><!--\r\n";
	echo "mlcalc_currency_symbol = '$currency_symbol';\r\n";
	echo "mlcalc_amortization    = '$amortization';\r\n";
	echo "var _mlcalc_preload_img = new Image(312,44);\r\n";
	echo "_mlcalc_preload_img.src='".plugins_url('images/ajax-loader.gif', __FILE__)."';\r\n";
	echo "--></script>\r\n";

	include($WL_DIR_PREFIX."forms.inc.php");
	echo "<!-- MLCALC END -->\r\n";
	if($shortcode){
		$result = ob_get_contents();
		ob_end_clean();
		if(is_null($content)){
			return $result;
		} else {
			return $content . $result;
		}
	}
}