Makes theme setting per-user

app/classes/user.php

@@ -12,6 +12,11 @@ class User {
     private $db;
     private $rateLimiter;
     private $twoFactorAuth;
+    /**
+     * Cache for database schema checks
+     * @var array<string,bool>
+     */
+    private static $schemaCache = [];
 
     /**
      * User constructor.
@@ -32,6 +37,79 @@ class User {
         $this->twoFactorAuth = new TwoFactorAuthentication($database);
     }
 
+    /**
+     * Check if a column exists in a given table. Results are cached per request.
+     *
+     * @param string $table
+     * @param string $column
+     * @return bool
+     */
+    private function columnExists(string $table, string $column): bool {
+        $cacheKey = $table . '.' . $column;
+        if (isset(self::$schemaCache[$cacheKey])) {
+            return self::$schemaCache[$cacheKey];
+        }
+        try {
+            $stmt = $this->db->prepare("SHOW COLUMNS FROM `$table` LIKE :column");
+            $stmt->execute([':column' => $column]);
+            $exists = (bool)$stmt->fetch(PDO::FETCH_ASSOC);
+            self::$schemaCache[$cacheKey] = $exists;
+            return $exists;
+        } catch (Exception $e) {
+            // On error, assume column doesn't exist to be safe
+            self::$schemaCache[$cacheKey] = false;
+            return false;
+        }
+    }
+
+    /**
+     * Get the user's preferred theme if stored in DB (user_meta.theme). Returns null if not set.
+     *
+     * @param int $userId
+     * @return string|null
+     */
+    public function getUserTheme(int $userId): ?string {
+        if (!$this->columnExists('user_meta', 'theme')) {
+            return null;
+        }
+        try {
+            $sql = 'SELECT theme FROM user_meta WHERE user_id = :user_id LIMIT 1';
+            $stmt = $this->db->prepare($sql);
+            $stmt->execute([':user_id' => $userId]);
+            $row = $stmt->fetch(PDO::FETCH_ASSOC);
+            if (!$row) {
+                return null;
+            }
+            $theme = $row['theme'] ?? null;
+            return ($theme !== null && $theme !== '') ? $theme : null;
+        } catch (Exception $e) {
+            return null;
+        }
+    }
+
+    /**
+     * Persist the user's preferred theme in DB (user_meta.theme) when the column exists.
+     * Silently no-ops if the column is missing.
+     *
+     * @param int $userId
+     * @param string $theme
+     * @return bool True when stored or safely skipped; false only on explicit DB error.
+     */
+    public function setUserTheme(int $userId, string $theme): bool {
+        if (!$this->columnExists('user_meta', 'theme')) {
+            // Column not present; treat as success to avoid breaking UX
+            return true;
+        }
+        try {
+            $sql = 'UPDATE user_meta SET theme = :theme WHERE user_id = :user_id';
+            $stmt = $this->db->prepare($sql);
+            $ok = $stmt->execute([':theme' => $theme, ':user_id' => $userId]);
+            return (bool)$ok;
+        } catch (Exception $e) {
+            return false;
+        }
+    }
+
 
     /**
      * Logs in a user by verifying credentials.

app/helpers/theme.php

@@ -150,9 +150,25 @@ EOT;
         if ($sessionTheme && isset(self::$config['available_themes'][$sessionTheme])) {
             self::$currentTheme = $sessionTheme;
         } else {
-            // Fall back to default theme
+            // Attempt to load per-user theme from DB if user is logged in and userObject is available
+            if (Session::isValidSession() && isset($_SESSION['user_id']) && isset($GLOBALS['userObject']) && is_object($GLOBALS['userObject']) && method_exists($GLOBALS['userObject'], 'getUserTheme')) {
+                try {
+                    $dbTheme = $GLOBALS['userObject']->getUserTheme((int)$_SESSION['user_id']);
+                    if ($dbTheme && isset(self::$config['available_themes'][$dbTheme]) && self::themeExists($dbTheme)) {
+                        // Set session and current theme to the user's stored preference
+                        $_SESSION['theme'] = $dbTheme;
+                        self::$currentTheme = $dbTheme;
+                    }
+                } catch (\Throwable $e) {
+                    // Ignore and continue to default fallback
+                }
+            }
+
+            // Fall back to default theme if still not determined
+            if (self::$currentTheme === null) {
                 self::$currentTheme = self::$config['active_theme'];
             }
+        }
 
         return self::$currentTheme;
     }
@@ -202,7 +218,7 @@ EOT;
      * @param string $themeName
      * @return bool
      */
-    public static function setCurrentTheme(string $themeName): bool
+    public static function setCurrentTheme(string $themeName, bool $persist = true): bool
     {
         if (!self::themeExists($themeName)) {
             return false;
@@ -218,49 +234,16 @@ EOT;
         // Clear the current theme cache
         self::$currentTheme = null;
 
-        // Update config file
+        // Persist per-user preference in DB when available and requested
-        $configFile = __DIR__ . '/../config/theme.php';
+        if ($persist && Session::isValidSession() && isset($_SESSION['user_id'])) {
-
+            // Try to use existing user object if available
-        // Check if config file exists and is writable
+            if (isset($GLOBALS['userObject']) && is_object($GLOBALS['userObject']) && method_exists($GLOBALS['userObject'], 'setUserTheme')) {
-        if (!file_exists($configFile)) {
+                try {
-            error_log("Theme config file not found: $configFile");
+                    $GLOBALS['userObject']->setUserTheme((int)$_SESSION['user_id'], $themeName);
-            return false;
+                } catch (\Throwable $e) {
+                    // Non-fatal: keep session theme even if DB save fails
+                    error_log('Failed to persist user theme: ' . $e->getMessage());
                 }
-
-        if (!is_writable($configFile)) {
-            error_log("Theme config file is not writable: $configFile");
-            if (isset($GLOBALS['feedback_messages'])) {
-                $GLOBALS['feedback_messages'][] = [
-                    'type' => 'error',
-                    'message' => 'Cannot save theme preference: configuration file is not writable.'
-                ];
-            }
-            return false;
-        }
-
-        $config = file_get_contents($configFile);
-        if ($config === false) {
-            error_log("Failed to read theme config file: $configFile");
-            return false;
-        }
-
-        // Update the active_theme in the config
-        $newConfig = preg_replace(
-            "/'active_theme'\s*=>\s*'[^']*'/",
-            "'active_theme' => '" . addslashes($themeName) . "'",
-            $config
-        );
-
-        if ($newConfig !== $config) {
-            if (file_put_contents($configFile, $newConfig) === false) {
-                error_log("Failed to write to theme config file: $configFile");
-                if (isset($GLOBALS['feedback_messages'])) {
-                    $GLOBALS['feedback_messages'][] = [
-                        'type' => 'error',
-                        'message' => 'Failed to save theme preference due to a system error.'
-                    ];
-                }
-                return false;
             }
         }
 

doc/database/main.sql

@@ -32,6 +32,7 @@ CREATE TABLE `user_meta` (
   `timezone` varchar(255) DEFAULT NULL,
   `avatar` varchar(255) DEFAULT NULL,
   `bio` text DEFAULT NULL,
+  `theme` varchar(255) DEFAULT NULL,
   PRIMARY KEY (`id`,`user_id`) USING BTREE,
   KEY `user_id` (`user_id`),
   CONSTRAINT `user_meta_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`)

public_html/index.php

@@ -210,6 +210,18 @@ if (!$pipeline->run()) {
     exit;
 }
 
+// Apply per-user theme from DB into session (without persisting) once user is known
+if ($validSession && isset($userId) && isset($userObject) && is_object($userObject) && method_exists($userObject, 'getUserTheme')) {
+    try {
+        $dbTheme = $userObject->getUserTheme((int)$userId);
+        if ($dbTheme) {
+            \App\Helpers\Theme::setCurrentTheme($dbTheme, false);
+        }
+    } catch (\Throwable $e) {
+        // Non-fatal if theme load fails
+    }
+}
+
 // get platforms details
 require '../app/classes/platform.php';
 $platformObject = new Platform($db);