vibn-frontend/app/api/chat/threads/route.ts

/**
 * GET  /api/chat/threads  — list user's threads
 * POST /api/chat/threads  — create a new thread
 */
import { NextResponse } from 'next/server';
import { authSession } from '@/lib/auth/session-server';
import { query } from '@/lib/db-postgres';

export async function GET(request: Request) {
  const session = await authSession();
  if (!session?.user?.email) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

  const { searchParams } = new URL(request.url);
  const workspace = searchParams.get('workspace') || '';

  const rows = await query<any>(
    `SELECT id, data, created_at, updated_at
     FROM fs_chat_threads
     WHERE user_id = $1 AND workspace = $2
     ORDER BY updated_at DESC
     LIMIT 50`,
    [session.user.email, workspace],
  );

  return NextResponse.json({
    threads: rows.map((r: any) => ({
      id: r.id,
      title: r.data?.title || 'New conversation',
      updatedAt: r.updated_at,
      createdAt: r.created_at,
    })),
  });
}

export async function POST(request: Request) {
  const session = await authSession();
  if (!session?.user?.email) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

  const { workspace, title } = await request.json().catch(() => ({}));
  if (!workspace) return NextResponse.json({ error: 'workspace required' }, { status: 400 });

  const rows = await query<any>(
    `INSERT INTO fs_chat_threads (user_id, workspace, data)
     VALUES ($1, $2, $3)
     RETURNING id, data, created_at, updated_at`,
    [
      session.user.email,
      workspace,
      JSON.stringify({ title: title || 'New conversation', createdAt: new Date().toISOString(), updatedAt: new Date().toISOString() }),
    ],
  );

  const r = rows[0];
  return NextResponse.json({ thread: { id: r.id, title: r.data?.title || 'New conversation', createdAt: r.created_at, updatedAt: r.updated_at } });
}