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<?php

include('config/constants.php');

//Get the Current Values of Selected List
    if(isset($_GET['list_id']))
    {
        //Get the List ID value
        $list_id = $_GET['list_id'];
        
        //Connect to Database
        $conn = mysqli_connect(LOCALHOST, DB_USERNAME, DB_PASSWORD) or die(mysqli_error());
        
        //SElect DAtabase
        $db_select = mysqli_select_db($conn, DB_NAME) or die(mysqli_error());
        
        //Query to Get the Values from Database
        $sql = "SELECT * FROM tbl_lists WHERE list_id=$list_id";
        
        //Execute Query
        $res = mysqli_query($conn, $sql);
        
        //CHekc whether the query executed successfully or not
        if($res==true)
        {
            //Get the Value from Database
            $row = mysqli_fetch_assoc($res); //Value is in array
            
            //printing $row array
            //print_r($row);
            
            //Create Individual Variable to save the data
            $list_name = $row['list_name'];
            $list_description = $row['list_description'];
        }
        else
        {
            //Go Back to Manage List Page
            header('location:'.SITEURL.'manage-list.php');
        }
    }

<html>

<head>
        <title>Task Manager</title>
        <link rel="stylesheet" href="<?php echo SITEURL; ?>css/style.css" />
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
    </head>
    
    <body>
        
        <div class="container">
    
            <div class="row">

<h1 class="text-center">Task Manager Application</h1>

<a class="btn-secondary" href="<?php echo SITEURL; ?>">Home</a>
                <a class="btn-secondary" href="<?php echo SITEURL; ?>manage-list.php">Manage Lists</a>

<h3>Update List Page</h3>

<form method="POST" action="">
                <div class="mb-3">
                    <label for="exampleLabel" class="form-label">List Name</label>
                    <input type="text" name="list_name" class="form-control" value="<?php echo $list_name; ?>" required="required" />
                   
                </div>

<div class="mb-3">
                    <label for="exampleDesc" class="form-label">List Description</label>
                    <textarea name="list_description" class="form-control">
                            <?php echo $list_description; ?>
                        </textarea>
                </div>

<button type="submit" name="submit" class="btn btn-primary">Make Changes</button>
                </form>

</div>

</div>

</div>
        
        
    
    </body>

</html>

<?php

//Check whether the Update is Clicked or Not
    if(isset($_POST['submit']))
    {
        //echo "Button Clicked";
        
        //Get the Updated Values from our Form
        $list_name = $_POST['list_name'];
        $list_description = $_POST['list_description'];
        
        //Connect Database
        $conn2 = mysqli_connect(LOCALHOST, DB_USERNAME, DB_PASSWORD) or die(mysqli_error());
        
        //SElect the Database
        $db_select2 = mysqli_select_db($conn2, DB_NAME);
        
        //QUERY to Update List
        $sql2 = "UPDATE tbl_lists SET 
            list_name = '$list_name',
            list_description = '$list_description' 
            WHERE list_id=$list_id
        ";
        
        //Execute the Query
        $res2 = mysqli_query($conn2, $sql2);
        
        //Check whether the query executed successfully or not
        if($res2==true)
        {
            //Update Successful
            //SEt the Message
            $_SESSION['update'] = "List Updated Successfully";
            
            //Redirect to Manage List PAge
            header('location:'.SITEURL.'manage-list.php');
        }
        else
        {
            //FAiled to Update
            //SEt Session Message
            $_SESSION['update_fail'] = "Failed to Update List";
            //Redirect to the Update List PAge
            header('location:'.SITEURL.'update-list.php?list_id='.$list_id);
        }
        
    }
?>