From 5704a06e22a2913604486b5ee4560d28a8df64c1 Mon Sep 17 00:00:00 2001
From: Demian Katz <demian.katz@villanova.edu>
Date: Thu, 19 Dec 2024 12:31:03 -0500
Subject: [PATCH] Implement menu navigation.

---
 .../Command/Menu/MenuCommand.php              | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/module/VuFindConsole/src/VuFindConsole/Command/Menu/MenuCommand.php b/module/VuFindConsole/src/VuFindConsole/Command/Menu/MenuCommand.php
index 4f771237ab7..3332c0cae8c 100644
--- a/module/VuFindConsole/src/VuFindConsole/Command/Menu/MenuCommand.php
+++ b/module/VuFindConsole/src/VuFindConsole/Command/Menu/MenuCommand.php
@@ -29,10 +29,15 @@
 
 namespace VuFindConsole\Command\Menu;
 
+use Exception;
 use Symfony\Component\Console\Attribute\AsCommand;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+use function count;
+use function in_array;
 
 /**
  * Console command: interactive menu.
@@ -71,6 +76,50 @@ protected function configure()
         $this->setHelp('Display an interactive menu of commands.');
     }
 
+    /**
+     * Display a submenu.
+     *
+     * @param InputInterface  $input   Input object
+     * @param OutputInterface $output  Output object
+     * @param array           $options Menu options
+     *
+     * @return int
+     */
+    protected function displaySubmenu(InputInterface $input, OutputInterface $output, array $options): int
+    {
+        $legalOptions = [];
+        foreach ($options as $i => $option) {
+            if (!isset($option['label'])) {
+                throw new Exception("Option $i is unlabeled!");
+            }
+            if (in_array($option['label'], $legalOptions)) {
+                throw new Exception('Duplicate label!');
+            }
+            $legalOptions[] = $option['label'];
+        }
+        $exitOption = 'Exit Menu';
+        if (in_array($exitOption, $legalOptions)) {
+            throw new Exception("Reserved label '$exitOption' used in configuration.");
+        }
+        $legalOptions[] = $exitOption;
+
+        $question = new ChoiceQuestion(
+            'Choose an option: ',
+            $legalOptions,
+            count($legalOptions) - 1
+        );
+        while (true) {
+            $choice = $this->getHelper('question')->ask($input, $output, $question);
+            if ($choice === $exitOption) {
+                return 0;
+            }
+            $index = array_search($choice, $legalOptions);
+            if ($index !== false) {
+                $this->displayOptions($input, $output, $options[$index]);
+            }
+        }
+    }
+
     /**
      * Display a menu or prompt for the provided configuration.
      *
@@ -82,10 +131,12 @@ protected function configure()
      */
     protected function displayOptions(InputInterface $input, OutputInterface $output, array $config): int
     {
+        $output->writeln($config['label'] ?? '');
         $type = $config['type'] ?? 'unknown';
         $label = $config['label'] ?? 'none';
         switch ($type) {
             case 'menu':
+                return $this->displaySubmenu($input, $output, $config['contents'] ?? []);
             case 'command':
             default:
                 $output->writeln("Unknown menu type '$type' with label '$label'");