<?php
    require_once("../../php/db_utils.php");
    
    try {
        // Connect to the database
        $database = db_connect();
        
        // Incoming data
        $canvasId = $_POST["canvas_id"];
        
        // Check if the tag already exists
        $query = 'SELECT canvas_public FROM canvas WHERE canvas_id = "' . $canvasId . '";';
        
        $recordSet = db_query_return($database, $query);
        
        $record = mysqli_fetch_assoc($recordSet);
        $public = $record["canvas_public"];
        mysqli_free_result($recordSet);
        
        // If the canvas is public
        if($public == "0") {
            // Update description
            $query = 'UPDATE canvas SET canvas_public="1" WHERE canvas_id="' . $canvasId . '";';
            echo("1");
        }
        // Else if the canvas is not public
        else if($public == "1") {
            // Add new tag with the description
            $query = 'UPDATE canvas SET canvas_public="0" WHERE canvas_id="' . $canvasId . '";';
            echo("0");
        }
        
        // Update old project title
        db_query_no_return($database, $query);
        
        // Close the connection to the database
        db_close($database);
    }
    catch(Exception $e) {
        $errorMsg = $e->getMessage();
        print_r($errorMsg);
    }
?>