feat: add editable system prompts from web UI

server.mjs

@@ -26,6 +26,8 @@ import {
   buildStylePrompt,
   buildSystemPrompt,
   buildUserMessage,
+  setActivePrompts,
+  DEFAULT_PROMPTS,
 } from './server/prompts.mjs';
 
 // ──────────────────────────────────────────────────────────────────────────────
@@ -38,6 +40,7 @@ const PORT = parseInt(process.env.PORT || '3000', 10);
 const CORS_ORIGIN = process.env.CORS_ORIGIN || '*';
 const DATA_DIR = process.env.DATA_DIR || join(__dirname, 'data');
 const HISTORY_FILE = join(DATA_DIR, 'history.json');
+const PROMPTS_FILE = join(DATA_DIR, 'prompts.json');
 const MAX_HISTORY = 500;
 
 const LLM = {
@@ -58,8 +61,20 @@ if (!LLM.endpoint || !LLM.apiKey) {
 // Ensure data directory exists
 await mkdir(DATA_DIR, { recursive: true });
 
-console.log(`[startup] LLM endpoint: ${LLM.endpoint}`);
-console.log(`[startup] LLM model:    ${LLM.model}`);
+// Load prompts
+try {
+  const customPromptsStr = await readFile(PROMPTS_FILE, 'utf-8');
+  const customPrompts = JSON.parse(customPromptsStr);
+  setActivePrompts(customPrompts);
+  console.log('[startup] Custom system prompts loaded');
+} catch (err) {
+  if (err.code !== 'ENOENT') {
+    console.error('[startup] Failed to read prompts.json:', err.message);
+  }
+}
+
+console.log(`[startup] Model:        ${LLM.model}`);
+console.log(`[startup] Endpoint:     ${LLM.endpoint}`);
 console.log(`[startup] Data dir:     ${DATA_DIR}`);
 console.log(`[startup] Listening on:  http://0.0.0.0:${PORT}`);
 
@@ -512,6 +527,45 @@ async function handleGenerate(req, res) {
   json(res, { error: lastErr?.message || 'Generation failed' }, 500);
 }
 
+// ──────────────────────────────────────────────────────────────────────────────
+// System Prompts Config Handlers
+// ──────────────────────────────────────────────────────────────────────────────
+import { activePrompts } from './server/prompts.mjs';
+import { unlink } from 'node:fs/promises';
+
+function handleGetSystemPrompts(req, res) {
+  json(res, activePrompts);
+}
+
+async function handlePostSystemPrompts(req, res) {
+  try {
+    const body = await parseJsonBody(req);
+    // Merge with defaults to ensure all keys exist
+    const newPrompts = { ...DEFAULT_PROMPTS, ...body };
+    setActivePrompts(newPrompts);
+    await writeFile(PROMPTS_FILE, JSON.stringify(newPrompts, null, 2), 'utf-8');
+    json(res, { success: true });
+  } catch (err) {
+    console.error('[prompts] failed to save', err);
+    json(res, { error: 'Failed to save prompts' }, 500);
+  }
+}
+
+async function handleDeleteSystemPrompts(req, res) {
+  try {
+    try {
+      await unlink(PROMPTS_FILE);
+    } catch (e) {
+      if (e.code !== 'ENOENT') throw e;
+    }
+    setActivePrompts(DEFAULT_PROMPTS);
+    json(res, { success: true });
+  } catch (err) {
+    console.error('[prompts] failed to delete', err);
+    json(res, { error: 'Failed to restore default prompts' }, 500);
+  }
+}
+
 // ──────────────────────────────────────────────────────────────────────────────
 // Server
 // ──────────────────────────────────────────────────────────────────────────────
@@ -532,6 +586,18 @@ const server = createServer(async (req, res) => {
   if (req.method === 'GET' && req.url.split('?')[0] === '/api/config') {
     return handleConfig(req, res);
   }
+  
+  // System Prompts endpoints
+  if (req.method === 'GET' && req.url.split('?')[0] === '/api/system-prompts') {
+    return handleGetSystemPrompts(req, res);
+  }
+  if (req.method === 'POST' && req.url.split('?')[0] === '/api/system-prompts') {
+    return handlePostSystemPrompts(req, res);
+  }
+  if (req.method === 'DELETE' && req.url.split('?')[0] === '/api/system-prompts') {
+    return handleDeleteSystemPrompts(req, res);
+  }
+
   if (req.method === 'POST' && req.url.split('?')[0] === '/api/generate') {
     return handleGenerate(req, res);
   }