Add callback management API/UI and theme support

- Add callback CRUD endpoints (create, update, delete, list)
- Add callback management UI with all 11 callback events support
- Add light/dark theme switcher with localStorage persistence
- Improve button styling (wider buttons, simplified text)
- Extend ConfigManager with callback operations

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

media_server/static/index.html

@@ -18,6 +18,19 @@
             --error: #e74c3c;
         }
 
+        :root[data-theme="light"] {
+            --bg-primary: #ffffff;
+            --bg-secondary: #f5f5f5;
+            --bg-tertiary: #e8e8e8;
+            --text-primary: #1a1a1a;
+            --text-secondary: #4a4a4a;
+            --text-muted: #888888;
+            --accent: #1db954;
+            --accent-hover: #1ed760;
+            --border: #d0d0d0;
+            --error: #e74c3c;
+        }
+
         * {
             margin: 0;
             padding: 0;
@@ -71,6 +84,30 @@
             background: var(--accent);
         }
 
+        .theme-toggle {
+            background: var(--bg-tertiary);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 0.5rem;
+            cursor: pointer;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            transition: all 0.3s;
+            width: 40px;
+            height: 40px;
+        }
+
+        .theme-toggle:hover {
+            background: var(--border);
+        }
+
+        .theme-toggle svg {
+            width: 20px;
+            height: 20px;
+            fill: var(--text-primary);
+        }
+
         .player-container {
             background: var(--bg-secondary);
             border-radius: 12px;
@@ -352,7 +389,7 @@
         }
 
         .add-script-btn {
-            padding: 0.5rem 1rem;
+            padding: 0.5rem 1.5rem;
             border-radius: 6px;
             background: var(--accent);
             border: none;
@@ -361,6 +398,7 @@
             font-size: 0.875rem;
             font-weight: 600;
             transition: background 0.2s;
+            min-width: 140px;
         }
 
         .add-script-btn:hover {
@@ -459,7 +497,8 @@
         }
 
         .dialog-body input,
-        .dialog-body textarea {
+        .dialog-body textarea,
+        .dialog-body select {
             display: block;
             width: 100%;
             padding: 0.5rem;
@@ -478,7 +517,8 @@
         }
 
         .dialog-body input:focus,
-        .dialog-body textarea:focus {
+        .dialog-body textarea:focus,
+        .dialog-body select:focus {
             outline: none;
             border-color: var(--accent);
         }
@@ -723,9 +763,19 @@
     <div class="container">
         <header>
             <h1>Media Server</h1>
-            <div class="status-indicator">
-                <span class="status-dot" id="status-dot"></span>
-                <span id="status-text">Disconnected</span>
+            <div style="display: flex; align-items: center; gap: 1rem;">
+                <button class="theme-toggle" onclick="toggleTheme()" title="Toggle theme" id="theme-toggle">
+                    <svg id="theme-icon-sun" viewBox="0 0 24 24" style="display: none;">
+                        <path d="M12 7c-2.76 0-5 2.24-5 5s2.24 5 5 5 5-2.24 5-5-2.24-5-5-5zM2 13h2c.55 0 1-.45 1-1s-.45-1-1-1H2c-.55 0-1 .45-1 1s.45 1 1 1zm18 0h2c.55 0 1-.45 1-1s-.45-1-1-1h-2c-.55 0-1 .45-1 1s.45 1 1 1zM11 2v2c0 .55.45 1 1 1s1-.45 1-1V2c0-.55-.45-1-1-1s-1 .45-1 1zm0 18v2c0 .55.45 1 1 1s1-.45 1-1v-2c0-.55-.45-1-1-1s-1 .45-1 1zM5.99 4.58c-.39-.39-1.03-.39-1.41 0-.39.39-.39 1.03 0 1.41l1.06 1.06c.39.39 1.03.39 1.41 0s.39-1.03 0-1.41L5.99 4.58zm12.37 12.37c-.39-.39-1.03-.39-1.41 0-.39.39-.39 1.03 0 1.41l1.06 1.06c.39.39 1.03.39 1.41 0 .39-.39.39-1.03 0-1.41l-1.06-1.06zm1.06-10.96c.39-.39.39-1.03 0-1.41-.39-.39-1.03-.39-1.41 0l-1.06 1.06c-.39.39-.39 1.03 0 1.41s1.03.39 1.41 0l1.06-1.06zM7.05 18.36c.39-.39.39-1.03 0-1.41-.39-.39-1.03-.39-1.41 0l-1.06 1.06c-.39.39-.39 1.03 0 1.41s1.03.39 1.41 0l1.06-1.06z"/>
+                    </svg>
+                    <svg id="theme-icon-moon" viewBox="0 0 24 24">
+                        <path d="M9 2c-1.05 0-2.05.16-3 .46 4.06 1.27 7 5.06 7 9.54 0 4.48-2.94 8.27-7 9.54.95.3 1.95.46 3 .46 5.52 0 10-4.48 10-10S14.52 2 9 2z"/>
+                    </svg>
+                </button>
+                <div class="status-indicator">
+                    <span class="status-dot" id="status-dot"></span>
+                    <span id="status-text">Disconnected</span>
+                </div>
             </div>
         </header>
 
@@ -801,7 +851,7 @@
         <div class="script-management">
             <div class="script-management-header">
                 <h2>Script Management</h2>
-                <button class="add-script-btn" onclick="showAddScriptDialog()">+ Add Script</button>
+                <button class="add-script-btn" onclick="showAddScriptDialog()">+ Add</button>
             </div>
             <table class="scripts-table">
                 <thead>
@@ -820,6 +870,32 @@
                 </tbody>
             </table>
         </div>
+
+        <!-- Callback Management Section -->
+        <div class="script-management">
+            <div class="script-management-header">
+                <h2>Callback Management</h2>
+                <button class="add-script-btn" onclick="showAddCallbackDialog()">+ Add</button>
+            </div>
+            <p style="color: var(--text-secondary); font-size: 0.875rem; margin-bottom: 1rem;">
+                Callbacks are scripts triggered automatically by media control events (play, pause, volume, etc.)
+            </p>
+            <table class="scripts-table">
+                <thead>
+                    <tr>
+                        <th>Event</th>
+                        <th>Command</th>
+                        <th>Timeout</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody id="callbacksTableBody">
+                    <tr>
+                        <td colspan="4" class="empty-state">No callbacks configured. Click "Add Callback" to create one.</td>
+                    </tr>
+                </tbody>
+            </table>
+        </div>
     </div>
 
     <!-- Add/Edit Script Dialog -->
@@ -870,10 +946,87 @@
         </form>
     </dialog>
 
+    <!-- Add/Edit Callback Dialog -->
+    <dialog id="callbackDialog">
+        <div class="dialog-header">
+            <h3 id="callbackDialogTitle">Add Callback</h3>
+        </div>
+        <form id="callbackForm" onsubmit="saveCallback(event)">
+            <div class="dialog-body">
+                <input type="hidden" id="callbackIsEdit">
+
+                <label>
+                    Event *
+                    <select id="callbackName" required>
+                        <option value="">Select event...</option>
+                        <option value="on_play">on_play - After play succeeds</option>
+                        <option value="on_pause">on_pause - After pause succeeds</option>
+                        <option value="on_stop">on_stop - After stop succeeds</option>
+                        <option value="on_next">on_next - After next track succeeds</option>
+                        <option value="on_previous">on_previous - After previous track succeeds</option>
+                        <option value="on_volume">on_volume - After volume change</option>
+                        <option value="on_mute">on_mute - After mute toggle</option>
+                        <option value="on_seek">on_seek - After seek succeeds</option>
+                        <option value="on_turn_on">on_turn_on - Callback-only action</option>
+                        <option value="on_turn_off">on_turn_off - Callback-only action</option>
+                        <option value="on_toggle">on_toggle - Callback-only action</option>
+                    </select>
+                </label>
+
+                <label>
+                    Command *
+                    <input type="text" id="callbackCommand" required placeholder="e.g., shutdown /s /t 0">
+                </label>
+
+                <label>
+                    Timeout (seconds)
+                    <input type="number" id="callbackTimeout" value="30" min="1" max="300">
+                </label>
+
+                <label>
+                    Working Directory
+                    <input type="text" id="callbackWorkingDir" placeholder="Optional">
+                </label>
+            </div>
+            <div class="dialog-footer">
+                <button type="button" class="btn-secondary" onclick="closeCallbackDialog()">Cancel</button>
+                <button type="submit" class="btn-primary">Save</button>
+            </div>
+        </form>
+    </dialog>
+
     <!-- Toast Notification -->
     <div class="toast" id="toast"></div>
 
     <script>
+        // Theme management
+        function initTheme() {
+            const savedTheme = localStorage.getItem('theme') || 'dark';
+            setTheme(savedTheme);
+        }
+
+        function setTheme(theme) {
+            document.documentElement.setAttribute('data-theme', theme);
+            localStorage.setItem('theme', theme);
+
+            const sunIcon = document.getElementById('theme-icon-sun');
+            const moonIcon = document.getElementById('theme-icon-moon');
+
+            if (theme === 'light') {
+                sunIcon.style.display = 'none';
+                moonIcon.style.display = 'block';
+            } else {
+                sunIcon.style.display = 'block';
+                moonIcon.style.display = 'none';
+            }
+        }
+
+        function toggleTheme() {
+            const currentTheme = document.documentElement.getAttribute('data-theme') || 'dark';
+            const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
+            setTheme(newTheme);
+        }
+
         let ws = null;
         let reconnectTimeout = null;
         let currentState = 'idle';
@@ -889,11 +1042,15 @@
 
         // Initialize on page load
         window.addEventListener('DOMContentLoaded', () => {
+            // Initialize theme
+            initTheme();
+
             const token = localStorage.getItem('media_server_token');
             if (token) {
                 connectWebSocket(token);
                 loadScripts();
                 loadScriptsTable();
+                loadCallbacksTable();
             } else {
                 showAuthForm();
             }
@@ -980,6 +1137,7 @@
                 hideAuthForm();
                 loadScripts();
                 loadScriptsTable();
+                loadCallbacksTable();
             };
 
             ws.onmessage = (event) => {
@@ -1515,6 +1673,178 @@
                 showToast('Error deleting script', 'error');
             }
         }
+
+        // Callback Management Functions
+
+        async function loadCallbacksTable() {
+            const token = localStorage.getItem('media_server_token');
+            const tbody = document.getElementById('callbacksTableBody');
+
+            try {
+                const response = await fetch('/api/callbacks/list', {
+                    headers: { 'Authorization': `Bearer ${token}` }
+                });
+
+                if (!response.ok) {
+                    throw new Error('Failed to fetch callbacks');
+                }
+
+                const callbacksList = await response.json();
+
+                if (callbacksList.length === 0) {
+                    tbody.innerHTML = '<tr><td colspan="4" class="empty-state">No callbacks configured. Click "Add Callback" to create one.</td></tr>';
+                    return;
+                }
+
+                tbody.innerHTML = callbacksList.map(callback => `
+                    <tr>
+                        <td><code>${callback.name}</code></td>
+                        <td style="max-width: 400px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;"
+                            title="${escapeHtml(callback.command)}">${escapeHtml(callback.command)}</td>
+                        <td>${callback.timeout}s</td>
+                        <td>
+                            <button class="action-btn" onclick="showEditCallbackDialog('${callback.name}')">Edit</button>
+                            <button class="action-btn delete" onclick="deleteCallbackConfirm('${callback.name}')">Delete</button>
+                        </td>
+                    </tr>
+                `).join('');
+            } catch (error) {
+                console.error('Error loading callbacks:', error);
+                tbody.innerHTML = '<tr><td colspan="4" class="empty-state" style="color: var(--error);">Failed to load callbacks</td></tr>';
+            }
+        }
+
+        function showAddCallbackDialog() {
+            const dialog = document.getElementById('callbackDialog');
+            const form = document.getElementById('callbackForm');
+            const title = document.getElementById('callbackDialogTitle');
+
+            // Reset form
+            form.reset();
+            document.getElementById('callbackIsEdit').value = 'false';
+            document.getElementById('callbackName').disabled = false;
+            title.textContent = 'Add Callback';
+
+            dialog.showModal();
+        }
+
+        async function showEditCallbackDialog(callbackName) {
+            const token = localStorage.getItem('media_server_token');
+            const dialog = document.getElementById('callbackDialog');
+            const title = document.getElementById('callbackDialogTitle');
+
+            try {
+                // Fetch current callback details
+                const response = await fetch('/api/callbacks/list', {
+                    headers: { 'Authorization': `Bearer ${token}` }
+                });
+
+                if (!response.ok) {
+                    throw new Error('Failed to fetch callback details');
+                }
+
+                const callbacksList = await response.json();
+                const callback = callbacksList.find(c => c.name === callbackName);
+
+                if (!callback) {
+                    showToast('Callback not found', 'error');
+                    return;
+                }
+
+                // Populate form
+                document.getElementById('callbackIsEdit').value = 'true';
+                document.getElementById('callbackName').value = callbackName;
+                document.getElementById('callbackName').disabled = true; // Can't change event name
+                document.getElementById('callbackCommand').value = callback.command;
+                document.getElementById('callbackTimeout').value = callback.timeout;
+                document.getElementById('callbackWorkingDir').value = callback.working_dir || '';
+
+                title.textContent = 'Edit Callback';
+                dialog.showModal();
+            } catch (error) {
+                console.error('Error loading callback for edit:', error);
+                showToast('Failed to load callback details', 'error');
+            }
+        }
+
+        function closeCallbackDialog() {
+            const dialog = document.getElementById('callbackDialog');
+            dialog.close();
+        }
+
+        async function saveCallback(event) {
+            event.preventDefault();
+
+            const token = localStorage.getItem('media_server_token');
+            const isEdit = document.getElementById('callbackIsEdit').value === 'true';
+            const callbackName = document.getElementById('callbackName').value;
+
+            const data = {
+                command: document.getElementById('callbackCommand').value,
+                timeout: parseInt(document.getElementById('callbackTimeout').value) || 30,
+                working_dir: document.getElementById('callbackWorkingDir').value || null,
+                shell: true
+            };
+
+            const endpoint = isEdit ?
+                `/api/callbacks/update/${callbackName}` :
+                `/api/callbacks/create/${callbackName}`;
+
+            const method = isEdit ? 'PUT' : 'POST';
+
+            try {
+                const response = await fetch(endpoint, {
+                    method,
+                    headers: {
+                        'Authorization': `Bearer ${token}`,
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify(data)
+                });
+
+                const result = await response.json();
+
+                if (response.ok && result.success) {
+                    showToast(`Callback ${isEdit ? 'updated' : 'created'} successfully`, 'success');
+                    closeCallbackDialog();
+                    loadCallbacksTable();
+                } else {
+                    showToast(result.detail || `Failed to ${isEdit ? 'update' : 'create'} callback`, 'error');
+                }
+            } catch (error) {
+                console.error('Error saving callback:', error);
+                showToast(`Error ${isEdit ? 'updating' : 'creating'} callback`, 'error');
+            }
+        }
+
+        async function deleteCallbackConfirm(callbackName) {
+            if (!confirm(`Are you sure you want to delete the callback "${callbackName}"?`)) {
+                return;
+            }
+
+            const token = localStorage.getItem('media_server_token');
+
+            try {
+                const response = await fetch(`/api/callbacks/delete/${callbackName}`, {
+                    method: 'DELETE',
+                    headers: {
+                        'Authorization': `Bearer ${token}`
+                    }
+                });
+
+                const result = await response.json();
+
+                if (response.ok && result.success) {
+                    showToast('Callback deleted successfully', 'success');
+                    loadCallbacksTable();
+                } else {
+                    showToast(result.detail || 'Failed to delete callback', 'error');
+                }
+            } catch (error) {
+                console.error('Error deleting callback:', error);
+                showToast('Error deleting callback', 'error');
+            }
+        }
     </script>
 </body>
 </html>