const BASE = '/api';

function token() { return localStorage.getItem('token') || ''; }
function authHeaders() { return { 'Authorization': `Bearer ${token()}`, 'Content-Type': 'application/json; charset=utf-8' }; }

export interface SmsMessage {
  id: number;
  phone_number: string;
  contact_name: string | null;
  content: string;
  type: 'received' | 'sent';
  sms_date: string;
  created_at: string;
}

export interface SmsListResponse {
  messages: SmsMessage[];
  total: number;
  page: number;
  limit: number;
  totalPages: number;
}

async function parseError(res: Response): Promise<string> {
  try {
    const data = await res.json();
    return data.error || `${res.status} ${res.statusText}`;
  } catch {
    return `${res.status} ${res.statusText}`;
  }
}

export async function verifyToken(t: string) {
  const res = await fetch(`${BASE}/auth/verify`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json; charset=utf-8' },
    body: JSON.stringify({ token: t }),
  });
  if (!res.ok) throw new Error(await parseError(res));
  return res.json();
}

export async function fetchSms(params: Record<string, string> = {}): Promise<SmsListResponse> {
  const qs = new URLSearchParams(params).toString();
  const res = await fetch(`${BASE}/sms?${qs}`, { headers: authHeaders() });
  if (!res.ok) throw new Error('Failed to fetch');
  return res.json();
}

export async function deleteSms(id: number) {
  const res = await fetch(`${BASE}/sms/${id}`, { method: 'DELETE', headers: authHeaders() });
  if (!res.ok) throw new Error('Delete failed');
}