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src/servers/api/settings/settings.ts

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+import { createRouter } from '../../create-router';
+import { mkdir } from 'node:fs/promises';
+import { dirname } from 'node:path';
+import { getUserSettingsFile, getUserStateFile } from '@@/data-path';
+
+const DEFAULT_SETTINGS = {
+  chat: {
+    defaultProvider: 'claude',
+    defaultModel: null,
+    systemPrompt: '',
+    temperature: 1,
+    defaultPwd: '~',
+  },
+  appearance: {
+    theme: 'light',
+  },
+};
+
+const ensureDir = (filePath: string) => mkdir(dirname(filePath), { recursive: true });
+
+export const settingsRouter = createRouter();
+
+// GET /settings — return settings.json, auto-create with defaults if missing
+settingsRouter.get('/settings', async (ctx) => {
+  const email = ctx.get('user').email;
+  const filePath = getUserSettingsFile(email);
+  const file = Bun.file(filePath);
+
+  if (await file.exists()) {
+    const data = await file.json();
+    return ctx.json(data);
+  }
+
+  await ensureDir(filePath);
+  await Bun.write(file, JSON.stringify(DEFAULT_SETTINGS, null, 2));
+  return ctx.json(DEFAULT_SETTINGS);
+});
+
+// PUT /settings — full replacement
+settingsRouter.put('/settings', async (ctx) => {
+  const email = ctx.get('user').email;
+  const body = ctx.get('body');
+  const filePath = getUserSettingsFile(email);
+
+  await ensureDir(filePath);
+  await Bun.write(filePath, JSON.stringify(body, null, 2));
+  return ctx.json(body);
+});
+
+// GET /state — return state.json, auto-create with {} if missing
+settingsRouter.get('/state', async (ctx) => {
+  const email = ctx.get('user').email;
+  const filePath = getUserStateFile(email);
+  const file = Bun.file(filePath);
+
+  if (await file.exists()) {
+    const data = await file.json();
+    return ctx.json(data);
+  }
+
+  await ensureDir(filePath);
+  await Bun.write(file, JSON.stringify({}, null, 2));
+  return ctx.json({});
+});
+
+// PATCH /state — shallow-merge incoming keys
+settingsRouter.patch('/state', async (ctx) => {
+  const email = ctx.get('user').email;
+  const body = ctx.get('body');
+  const filePath = getUserStateFile(email);
+  const file = Bun.file(filePath);
+
+  let existing: Record<string, unknown> = {};
+  if (await file.exists()) {
+    existing = await file.json();
+  }
+
+  const merged = { ...existing, ...body };
+  await ensureDir(filePath);
+  await Bun.write(filePath, JSON.stringify(merged, null, 2));
+  return ctx.json(merged);
+});