From d022d19eeacb2be431d8c041b304138c4fa439d1 Mon Sep 17 00:00:00 2001
From: Fabian Schieder <fabian.schieder.1010@gmail.com>
Date: Mon, 30 Mar 2026 20:31:35 +0200
Subject: [PATCH] Add user management functionality in admin_users.php

---
 account.php     |  3 ++
 admin_users.php | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 admin_users.php

diff --git a/account.php b/account.php
index fc00ac5..888a2e1 100644
--- a/account.php
+++ b/account.php
@@ -116,6 +116,9 @@ include 'header.php';
                             <a href="productAdder.php" class="auth__submit account__action-link">
                                 Produkt hinzufügen
                             </a>
+                            <a href="admin_users.php" class="auth__submit account__action-link" style="margin-top: 10px; background-color: #3b82f6;">
+                                Benutzerverwaltung
+                            </a>
                         <?php endif; ?>
                         <a href="wunschliste.php"
                            class="auth__submit account__action-link account__action-link--secondary">
diff --git a/admin_users.php b/admin_users.php
new file mode 100644
index 0000000..0ac4cb9
--- /dev/null
+++ b/admin_users.php
@@ -0,0 +1,93 @@
+<?php
+// admin_users.php
+
+require_once __DIR__ . '/lib/bootstrap.php';
+
+// 1) Zugriffskontrolle – nur ADMIN
+if (empty($_SESSION['user_id']) || empty($_SESSION['user_roles']) || !in_array('ADMIN', $_SESSION['user_roles'], true)) {
+    die("Zugriff verweigert. Nur Administratoren dürfen diese Seite sehen.");
+}
+
+$conn = db_connect();
+
+// 2) Aktion: Benutzer löschen
+if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['delete_user_id'])) {
+    $deleteId = (int)$_POST['delete_user_id'];
+    
+    // Vermeide Selbstlöschung zur Sicherheit
+    if ($deleteId !== (int)$_SESSION['user_id']) {
+        $delStmt = $conn->prepare("DELETE FROM users WHERE userID = ?");
+        $delStmt->bind_param("i", $deleteId);
+        $delStmt->execute();
+        $delStmt->close();
+        
+        $successMsg = "Benutzer erfolgreich gelöscht.";
+    } else {
+        $errorMsg = "Du kannst dich nicht selbst löschen.";
+    }
+}
+
+// 3) Alle Benutzer laden
+$usersResult = $conn->query("SELECT userID, email, displayname, profilePicture, isActive FROM users ORDER BY userID ASC");
+
+?>
+
+<?php include 'header.php'; ?>
+
+<main class="auth auth--admin">
+    <div class="auth__wrapper" style="max-width: 800px;">
+        <h1 class="auth__title">Benutzerverwaltung</h1>
+        <p class="auth__subtitle">Hier siehst du alle registrierten Benutzer.</p>
+
+        <?php if (!empty($successMsg)): ?>
+            <div class="auth__message auth__message--success"><?= htmlspecialchars($successMsg) ?></div>
+        <?php endif; ?>
+        <?php if (!empty($errorMsg)): ?>
+            <div class="auth__message auth__message--error"><?= htmlspecialchars($errorMsg) ?></div>
+        <?php endif; ?>
+
+        <div class="auth__card" style="padding: 20px;">
+            <table style="width: 100%; border-collapse: collapse; text-align: left;">
+                <thead>
+                    <tr style="border-bottom: 2px solid #334155;">
+                        <th style="padding: 10px;">ID</th>
+                        <th style="padding: 10px;">Profil</th>
+                        <th style="padding: 10px;">Name</th>
+                        <th style="padding: 10px;">E-Mail</th>
+                        <th style="padding: 10px;">Aktionen</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    <?php while ($user = $usersResult->fetch_assoc()): ?>
+                        <tr style="border-bottom: 1px solid #1e293b;">
+                            <td style="padding: 10px;"><?= $user['userID'] ?></td>
+                            <td style="padding: 10px;">
+                                <img src="<?= !empty($user['profilePicture']) ? htmlspecialchars($user['profilePicture']) : 'assets/images/placeholder.png' ?>" 
+                                     alt="Profil" style="width: 40px; height: 40px; border-radius: 50%; object-fit: cover;">
+                            </td>
+                            <td style="padding: 10px;"><?= htmlspecialchars($user['displayname']) ?></td>
+                            <td style="padding: 10px;"><?= htmlspecialchars($user['email']) ?></td>
+                            <td style="padding: 10px;">
+                                <?php if ((int)$user['userID'] !== (int)$_SESSION['user_id']): ?>
+                                    <form method="post" action="admin_users.php" onsubmit="return confirm('Benutzer wirklich löschen?');" style="margin: 0;">
+                                        <input type="hidden" name="delete_user_id" value="<?= $user['userID'] ?>">
+                                        <button type="submit" style="background-color: #ef4444; color: white; border: none; padding: 5px 10px; border-radius: 4px; cursor: pointer; font-size: 0.8rem;">Löschen</button>
+                                    </form>
+                                <?php else: ?>
+                                    <span style="color: #94a3b8; font-size: 0.8rem;">Das bist du</span>
+                                <?php endif; ?>
+                            </td>
+                        </tr>
+                    <?php endwhile; ?>
+                </tbody>
+            </table>
+        </div>
+        
+        <div class="auth__actions" style="margin-top: 20px;">
+            <a href="account.php" style="color: #cbd5e1; text-decoration: none;">&larr; Zurück zum Profil</a>
+        </div>
+    </div>
+</main>
+
+<?php include 'footer.php'; ?>
+