$lifetime = 60 * 3; // Set the lifetime to 3 minutes for instructor ease to grade assignments.
    session_set_cookie_params($lifetime);
    session_start();
    require_once('*********/*********.php');
    require_once('*********/*********.php');
    require_once('*********/*********.php');
    require_once('*********/*********.php');
    require_once('*********/*********.php');

    $action = filter_input(INPUT_POST, 'action');
    if ($action == null) {
        $action = filter_input(INPUT_GET, 'action');
        if ($action == null) {
            $action = 'getListView';
        }
    }

    if (!isset($_SESSION['userName'])) {
        if ($action == 'requestAccount' || $action == 'loginRequest' || $action == 'createAccount' || $action == 'logout') {}
        else $action = 'login_required'; }

    do {
        switch($action) {
            case 'login_required': // default for users who have not logged into the web page
                include('View/*********.php');
                exit();
                break;


            case 'logout': // User clicks the logout button
                unset($_COOKIE['usercookie']);
                unset($_COOKIE);
                $_SESSION = array(); // Seems to cause an error with session_destroy() because the session is no longer initalized
                //session_destroy();
                header('Location: .');
                exit();
                break;


            case 'loginRequest': // if the users submit login information, validate the user login information
                include('View/*********.php');
                if (!empty($errorMsg_userID) || !empty($errorMsg_userPassword)) {
                    //$vendors = get_vendor_list();
                    include('View/*********.php');
                    exit();
                    break;
                } else {
                    $results = userCredentials($userID);
                    if (isset($results['userid'])) {
                        if (password_verify($userPassword, $results['password'])) {
                            // Cookie Information
                            setcookie('usercookie[userName]', $results['name'], time() + 60 * 60);
                            setcookie('usercookie[account_type]', $results['account_type'], time() + 60 * 60);
                            // Session Information
                            $_SESSION['account_type'] = $results['account_type'];
                            $_SESSION['userName'] = $results['name'];
                            session_write_close(); // Write and Close the Session so that it stays if the browser refreshes.
                            $action='getListView'; // No redirect, placed switch inside do/while loop, for this instance only!
                            break;
                        } else {
                            $errorMsg_userPassword = 'User Password is incorrect.';
                            include('View/*********.php');
                            exit();
                            break;
                        }
                    } else {
                        $errorMsg_userID = 'User ID is not valid';
                        include('View/*********.php');
                        exit();
                        break;
                    }
                }
                break; // just in case, but honestly it should 'exit' or 'redirect' above.


            case 'requestAccount': // If the user goes to create an account
                include('View/*********.php');
                exit();
                break;


            case 'createAccount':
                include('View/*********.php');
                if (!empty($errorMsg_userID) || !empty($errorMsg_userName) || !empty($errorMsg_userPassword) ||
                        !empty($errorMsg_PasswordConfirmation) || !empty($errorMsg_AccountType)) {
                    include('View/*********.php');
                    exit();
                    break;
                } else {
                    add_user($userID, $userName, $userPassword, $userAcctType);
                    header('.?action=login_required');
                }
                break;

            case 'getListView': // This is the default page once a user has logged in, and is also requested after doing anything with the database.
                $products = get_product_list();
                $countProducts = countProducts();
                $vendors = get_vendor_list();
                $countVendors = countVendors();
                include('View/*********.php');
                exit();
                break;


            case 'newProduct': // This is the form sent if the user requests to add a new item.
                $vendors = get_vendor_list();
                include('View/*********.php');
                exit();
                break;


            case 'insertProduct': // If the user submits a new item, it is validated and dealt with here.
                include('View/*********.php');
                if (!empty($errorMsg_ProdID) || !empty($errorMsg_ProdVendID) || !empty($errorMsg_ProdName) ||
                    !empty($errorMsg_ProdDesc) || !empty($errorMsg_ProdPrice)) {
                    $vendors = get_vendor_list();
                    include('View/*********.php');
                    exit();
                    break;
                } else {
                    insert_product($ProdID, $ProdVendID, $ProdName, $ProdPrice, $ProdDesc);
                    // redirect takes place in the function
                }
                break; // just in case, but honestly it should 'exit' or 'redirect' above.


            case 'show_Update_Form': // This is the form sent if the user requests to update an item.
                $vendors = get_vendor_list();
                $product_ID = filter_input(INPUT_POST, 'prod_id', FILTER_SANITIZE_STRIPPED);
                $updated = get_product($product_ID);
                include('View/*********.php');
                break;


            case 'updateProduct': // If the user updates an item, it is validated and dealt with here.
                include('View/*********.php');
                if (!empty($errorMsg_ProdID) || !empty($errorMsg_ProdVendID) || !empty($errorMsg_ProdName) ||
                    !empty($errorMsg_ProdDesc) || !empty($errorMsg_ProdPrice)) {
                    $vendors = get_vendor_list();
                    include('View/*********.php');
                    exit();
                } else {
                    update_product($ProdID, $ProdVendID, $ProdName, $ProdPrice, $ProdDesc);
                    // redirect takes place in the function
                }
                break;


            case 'show_Delete_Confirm': // if the user requests to delete an item, they are sent to confirm their choice.
                $product_ID = filter_input(INPUT_POST, 'prod_id', FILTER_SANITIZE_STRIPPED);
                $updated = get_product($product_ID);
                include('View/*********.php');
                exit();
                break;


            case 'deleteProduct': // if the user has confirmed their choice to delete an item, they are sent here.
                $product_ID = filter_input(INPUT_POST, 'txtProdID', FILTER_SANITIZE_STRIPPED);
                delete_product($product_ID);
                break; // redirect takes place in the function


            case 'filterProducts':
                $vendors = get_vendor_list();
                if (isset($_POST['btnFilter'])) {
                    include('View/*********.php');
                    $products = product_filter($sqlQuery);
                } else {
                    $products = get_product_list();
                }
                include('View/*********.php');
                exit();
                break;


            case 'newVendor': // If the user wishes to add a new Vendor, they are sent here.
                include('vendorView/*********.php');
                exit();
                break;


            case 'update_Vendor_Form': // If the user wishes to update Vendor information, they are sent here.
                $txtVendID = filter_input(INPUT_POST, 'vend_id', FILTER_SANITIZE_STRIPPED);
                $updated = get_vendor($txtVendID);
                include('vendorView/*********.php');
                break;


            case 'delete_Vendor_Form': // If the user wishes to delete a Vendor, they are sent here to confirm the decision
                $txtVendID = filter_input(INPUT_POST, 'vend_id', FILTER_SANITIZE_STRIPPED);
                $updated = get_vendor($txtVendID);
                include('vendorView/*********.php');
                break;


            case 'insertVendor': // If the user wishes to add a new Vendor, after inputing the information they are sent here to validate and process
                include('vendorView/*********.php');
                if (!empty($errorMsg_VendName) || !empty($errorMsg_VendAddr) || !empty($errorMsg_VendCity) ||
                    !empty($errorMsg_VendState) || !empty($errorMsg_VendZIP) || !empty($errorMsg_VendCountry)){
                    include('vendorView/*********.php');
                    exit();
                } else {
                    insert_vendor($VendName, $VendAddress, $VendCity, $VendState, $VendZIP, $VendCountry);
                    // redirect takes place in the function
                }
                break;


            case 'updateVendor':// If the user wishes to update Vendor information, after inputing the information they are sent here to validate and process
                include('vendorView/*********.php');
                if (!empty($errorMsg_VendName) || !empty($errorMsg_VendAddr) || !empty($errorMsg_VendCity) ||
                    !empty($errorMsg_VendState) || !empty($errorMsg_VendZIP) || !empty($errorMsg_VendCountry)){
                    include('vendorView/*********.php');
                    exit();
                } else {
                    update_vendor($VendID, $VendName, $VendAddress, $VendCity, $VendState, $VendZIP, $VendCountry);
                    // redirect takes place in the function
                }
                break;


            case 'deleteVendor': // This is the php that deletes the vender from the table.
                $vendor_range = array("options" => array("min_range" => 1, "max_range" => 2147483647));
                $VendID = filter_input(INPUT_POST, 'txtVendID', FILTER_VALIDATE_INT, $vendor_range);
                delete_vendor($VendID);
                break;
        }
    } while ($action != 'today');