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<?php
    if (!isset($product_description)) { $product_description = ''; }
    if (!isset($list_price)) { $list_price = ''; }
    if (!isset($discount_percent)) { $discount_percent = ''; }
    if (!isset($Sales_Tax_Rate)) { $Sales_Tax_Rate = ''; }


	if ($_SERVER["REQUEST_METHOD"]== "POST") {
	    $product_description= FILTER_input(INPUT_POST, '$product_description',FILTER_VALIDATE_FLOAT );
		$list_price= FILTER_input(INPUT_POST, '$list_price' , FILTER_VALIDATE_FLOAT) ;
		$discount_percent = FILTER_input(INPUT_POST ,'$discount_percent', FILTER_VALIDATE_INT);
		$Sales_Tax_Rate = FILTER_input(INPUT_POST, '$Sales_Tax_Rate', FILTER_VALIDATE_INT);
	}

?>


<!DOCTYPE html>
<html>
<head>
    <title>Product Discount Calculator</title>
    <link rel="stylesheet" type="text/css" href="main.css">
</head>

<body>
    <main>
        <h1>Product Discount Calculator</h1>
        <?php if (!empty($error_message)) { ?>
            <p class="error"><?php echo $error_message; ?></p>
        <?php } // end if ?>
        <form action="display_discount.php" method="post">


            <div id="data">
                <label>Product Description:</label>
                <input type="text" name="product_description"
                       value="<?php echo htmlspecialchars($product_description); ?>"><br>

                <label>List Price:</label>
                <input type="text" name="list_price"
                       value="<?php echo htmlspecialchars($list_price); ?>"><br>

                <label>Discount Percent:</label>
                <input type="text" name="discount_percent"
                       value="<?php echo htmlspecialchars($discount_percent); ?>">

                <label>Sales Tax:</label>
                <input type="text" name="Sales_Tax_Rate"
                       value="<?php echo htmlspecialchars($Sales_Tax_Rate); ?>">

                <span>%</span><br>
				<input type="checkbox" value="8" name="chk_tax"/><label for="latest-events">Tax Percentage</label>

            </div>

            <div id="buttons">
                <label>&nbsp;</label>
                <input type="submit" value="Calculate Discount"><br>

            </div>


        </form>

    </main>
</body>
</html>