import { getToken } from './auth';

const API_BASE = (import.meta.env.VITE_API_BASE || '').replace(/\/$/, '');

async function request(path, options = {}) {
  const headers = {
    Accept: 'application/json',
    'Content-Type': 'application/json',
    ...(options.headers || {}),
  };
  const token = getToken();
  if (token && !headers.Authorization) {
    headers.Authorization = `Bearer ${token}`;
  }

  let res;
  try {
    res = await fetch(`${API_BASE}${path}`, {
      ...options,
      headers,
    });
  } catch (networkErr) {
    const err = new Error(
      `Cannot reach TGICS API at ${API_BASE || '(missing VITE_API_BASE)'}. Is the backend running, and is CORS allowing this origin?`
    );
    err.cause = networkErr;
    throw err;
  }
  const data = await res.json().catch(() => ({}));
  if (!res.ok) {
    const err = new Error(data.message || `Request failed (${res.status})`);
    err.status = res.status;
    err.data = data;
    throw err;
  }
  return data;
}

export function fetchDoctor(userId, contactId) {
  return request(`/api/doctors/${encodeURIComponent(userId)}/${encodeURIComponent(contactId)}`);
}

export function loginDoctorByPhone(userId, phone) {
  return request(`/api/doctors/${encodeURIComponent(userId)}/login`, {
    method: 'POST',
    body: JSON.stringify({ phone }),
  });
}

export function submitSurvey(payload) {
  return request('/api/surveys', {
    method: 'POST',
    body: JSON.stringify(payload),
  });
}

export function fetchPatients(contactId, limit = 100, offset = 0) {
  const qs = new URLSearchParams({
    contact_id: contactId,
    limit: String(limit),
    offset: String(offset),
  });
  return request(`/api/surveys?${qs.toString()}`);
}

export function login(email, password) {
  return request('/api/auth/login', {
    method: 'POST',
    body: JSON.stringify({ email, password }),
  });
}

export function fetchMe() {
  return request('/api/auth/me');
}

export function fetchDashboardStats() {
  return request('/api/dashboard/stats');
}

export function fetchDashboardSurveys(limit = 50, offset = 0) {
  return request(`/api/dashboard/surveys?limit=${limit}&offset=${offset}`);
}

export function fetchTmUsers(refresh = false) {
  return request(`/api/dashboard/tm-users${refresh ? '?refresh=1' : ''}`);
}

export function fetchDashboardDoctors(refresh = false) {
  return request(`/api/dashboard/doctors${refresh ? '?refresh=1' : ''}`);
}

export function updateDashboardDoctor(contactId, payload) {
  return request(`/api/dashboard/doctors/${encodeURIComponent(contactId)}`, {
    method: 'PATCH',
    body: JSON.stringify(payload),
  });
}

export function fetchSurveyDraft(contactId, userId) {
  const qs = new URLSearchParams({
    contact_id: contactId,
    user_id: userId,
  });
  return request(`/api/surveys/draft?${qs.toString()}`);
}

export function saveSurveyDraft(payload) {
  return request('/api/surveys/draft', {
    method: 'PUT',
    body: JSON.stringify(payload),
  });
}

export function deleteSurveyDraft(contactId, userId) {
  const qs = new URLSearchParams({
    contact_id: contactId,
    user_id: userId,
  });
  return request(`/api/surveys/draft?${qs.toString()}`, {
    method: 'DELETE',
  });
}

export function fetchDashboardPatients(refresh = false) {
  return request(`/api/dashboard/patients${refresh ? '?refresh=1' : ''}`);
}