<?php
// Include config file
require_once "config.php";
 
// Define variables and initialize with empty values
$SKU = $Bezeichnung = $EK = $VK = $Beschreibung = "";
$SKU_err = $Bezeichnung_err = $EK_err = $VK_err = $Beschreibung_err = "";
 
// Processing form data when form is submitted
if(isset($_POST["id"]) && !empty($_POST["id"])){
    // Get hidden input value
    $id = $_POST["id"];
    
   
    // Validate SKU
    $input_SKU = trim($_POST["SKU"]);
    if(empty($input_SKU)){
        $SKU_err = "Hier die Artikelnummer eintragen";
    } else{
        $SKU = $input_SKU;
    }

    // Validate Bezeichnung
    $input_Bezeichnung = trim($_POST["Bezeichnung"]);
    if(empty($input_Bezeichnung)){
        $Bezeichnung_err = "Bezeichnung";     
    } else{
        $Bezeichnung = $input_Bezeichnung;
    }

    // Validate EK
    $input_EK = trim($_POST["EK"]);
    if(empty($input_EK)){
        $EK_err = "EK";     
    } else{
        $EK = $input_EK;
    }

    // Validate VK
    $input_VK = trim($_POST["VK"]);
    if(empty($input_VK)){
        $VK_err = "VK";     
    } else{
        $VK = $input_VK;
    }

    // Validate Beschreibung
    $input_Beschreibung = trim($_POST["Beschreibung"]);
    if(empty($input_Beschreibung)){
        $Beschreibung_err = "Beschreibung";     
    } else{
        $Beschreibung = $input_Beschreibung;
    }
    
    // Check input errors before inserting in database
    if(empty($SKU_err) && empty($Bezeichnung_err) && empty($EK_err) && empty($VK_err) && empty($Beschreibung_err)){
        // Prepare an update statement
        $sql = "UPDATE mytable SET SKU=?, Bezeichnung=?, EK=?, VK=?, Beschreibung=? WHERE id=?";
         
        if($stmt = mysqli_prepare($link, $sql)){
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "ssssi", $param_SKU, $param_Bezeichnung, $param_EK, $param_VK, $param_Beschreibung,  $param_id);
            
            // Set parameters
            $param_SKU = $SKU;
            $param_Bezeichnung = $Bezeichnung;
            $param_EK = $EK;
            $param_VK = $VK;
            $param_BeschreibungK = $BeschreibungK;
            $param_id = $id;
            
            // Attempt to execute the prepared statement
            if(mysqli_stmt_execute($stmt)){
                // Records updated successfully. Redirect to landing page
                header("location: index.php");
                exit();
            } else{
                echo "Something went wrong. Please try again later.";
            }
        }
         
        // Close statement
        mysqli_stmt_close($stmt);
    }
    
    // Close connection
    mysqli_close($link);
} else{
    // Check existence of id parameter before processing further
    if(isset($_GET["id"]) && !empty(trim($_GET["id"]))){
        // Get URL parameter
        $id =  trim($_GET["id"]);
        
        // Prepare a select statement
        $sql = "SELECT * FROM employees WHERE id = ?";
        if($stmt = mysqli_prepare($link, $sql)){
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "i", $param_id);
            
            // Set parameters
            $param_id = $id;
            
            // Attempt to execute the prepared statement
            if(mysqli_stmt_execute($stmt)){
                $result = mysqli_stmt_get_result($stmt);
    
                if(mysqli_num_rows($result) == 1){
                    /* Fetch result row as an associative array. Since the result set
                    contains only one row, we don't need to use while loop */
                    $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
                    
                    // Retrieve individual field value
                    $SKU = $row["SKU"];
                    $Bezeichnung = $row["Bezeichnung"];
                    $EK = $row["EK"];
                    $VK = $row["VK"];
                    $Beschreibung= $row["Beschreibung"];
                } else{
                    // URL doesn't contain valid id. Redirect to error page
                    header("location: error.php");
                    exit();
                }
                
            } else{
                echo "Oops! Something went wrong. Please try again later.";
            }
        }
        
        

        // Close statement
        mysqli_stmt_close($stmt);
        
        // Close connection
        mysqli_close($link);
    }  else{
        // URL doesn't contain id parameter. Redirect to error page
        header("location: error.php");
        exit();
    }
}




?>
 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Update Record</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
    <style type="text/css">
        .wrapper{
            width: 100%;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <div class="container-fluid">
            <div class="row">
                <div class="col-md-12">
                    <div class="page-header">
                        <h2>Artikel updaten</h2>
                       


                    </div>
                    <p>Please edit the input values and submit to update the record.</p>
                    <form action="<?php echo htmlspecialchars(basename($_SERVER['REQUEST_URI'])); ?>" method="post">
                        <div class="form-group <?php echo (!empty($SKU_err)) ? 'has-error' : ''; ?>">
                            <label>SKU</label>
                            <input type="text" name="SKU" class="form-control" value="<?php echo $SKU; ?>" placeholder="<?php echo $id; ?>">
                            <span class="help-block"><?php echo $SKU_err;?></span>
                        </div>
                        <div class="form-group <?php echo (!empty($Bezeichnung_err)) ? 'has-error' : ''; ?>">
                            <label>Bezeichnung</label>
                            <textarea name="Bezeichnung" class="form-control" value="<?php echo $VK; ?>"> </textarea>
                            <span class="help-block"><?php echo $Bezeichnung_err;?></span>
                        </div>
                        <div class="form-group <?php echo (!empty($EK_err)) ? 'has-error' : ''; ?>">
                            <label>EK</label>
                            <input type="text" name="EK" class="form-control" value="<?php echo $EK; ?>">
                            <span class="help-block"><?php echo $EK_err;?></span>
                        </div>
                        <div class="form-group <?php echo (!empty($VK_err)) ? 'has-error' : ''; ?>">
                            <label>VK</label>
                            <input type="text" name="VK" class="form-control" value="<?php echo $VK; ?>">
                            <span class="help-block"><?php echo $VK_err;?></span>
                        </div>
                        <div class="form-group <?php echo (!empty($Beschreibung_err)) ? 'has-error' : ''; ?>">
                            <label>Beschreibung</label>
                            <input type="text" name="Beschreibung" class="form-control" value="<?php echo $Beschreibung; ?>">
                            <span class="help-block"><?php echo $Beschreibung_err;?></span>
                        </div>
                        <input type="hidden" name="id" value="<?php echo $id; ?>"/>
                        <input type="submit" class="btn btn-primary" value="Submit">
                        <a href="index.php" class="btn btn-default">Cancel</a>
                    </form>
                </div>
            </div>        
        </div>
    </div>
</body>
</html>