const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://45.93.137.91/api';

async function apiFetch(endpoint, options = {}) {
  const token = typeof window !== 'undefined' ? localStorage.getItem('token') : null;

  const headers = {
    'Content-Type': 'application/json',
    ...(token && { Authorization: `Bearer ${token}` }),
    ...options.headers,
  };

  console.log('[API] Request:', `${API_BASE}${endpoint}`, options.method || 'GET');

  const res = await fetch(`${API_BASE}${endpoint}`, {
    ...options,
    headers,
  });

  console.log('[API] Response:', res.status, endpoint);

  if (!res.ok && res.status !== 206) {
    const text = await res.text().catch(() => '');
    console.error('[API] Error:', res.status, text);
    throw new Error(`API ${res.status}: ${text || res.statusText}`);
  }

  const text = await res.text();
  if (!text) return null;

  try {
    const json = JSON.parse(text);
    if (json && typeof json === 'object' && 'data' in json) {
      return json.data;
    }
    return json;
  } catch {
    return text;
  }
}

// Raw fetch for auth (no token, returns full response for status code handling)
async function authFetch(endpoint, body) {
  console.log('[Auth] Request:', `${API_BASE}${endpoint}`);

  const res = await fetch(`${API_BASE}${endpoint}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(body),
  });

  console.log('[Auth] Response status:', res.status, endpoint);

  const text = await res.text();
  let data = null;
  try {
    data = text ? JSON.parse(text) : null;
    if (data && typeof data === 'object' && 'data' in data) {
      data = data.data;
    }
  } catch {
    data = text;
  }

  return { status: res.status, data, ok: res.ok || res.status === 206 };
}

// ─── Rent Properties ───

export async function getRentProperties() {
  return apiFetch('/RentProperties/GetRentProperties');
}

export async function getRentProperty(id) {
  const items = await apiFetch('/RentProperties/GetRentProperties');
  if (!Array.isArray(items)) return items;
  return items.find(p => p.id == id) || items[0];
}

export async function getRentPropertyLocations(params = {}) {
  const qs = new URLSearchParams();
  if (params.maxOffset != null) qs.set('maxOffset', params.maxOffset);
  if (params.minOffset != null) qs.set('minOffset', params.minOffset);
  const query = qs.toString();
  return apiFetch(`/RentProperties/GetRentPropertiesLocations${query ? `?${query}` : ''}`);
}

// ─── Sale Properties ───

export async function getSaleProperties() {
  return apiFetch('/SaleProperties/GetSaleProperties');
}

export async function getSaleProperty(id) {
  const items = await apiFetch('/SaleProperties/GetSaleProperties');
  if (!Array.isArray(items)) return items;
  return items.find(p => p.id == id) || items[0];
}

// ─── Properties (generic) ───

export async function getProperty(id) {
  return apiFetch(`/Properties/Get/${id}`);
}

// ─── Recommendations ───

export async function getRecommendations() {
  return apiFetch('/Recommendations/GetRecommendations');
}

export async function getTopRecommendations(count = 10) {
  return apiFetch(`/Recommendations/GetTopRecommendations?count=${count}`);
}

// ─── Reservations ───

export async function getReservations() {
  return apiFetch('/Reservations/GetReservations');
}

export async function getReservation(id) {
  return apiFetch(`/Reservations/GetReservation?id=${id}`);
}

export async function checkAvailability(propertyId, fromDate = null, toDate = null) {
  const qs = new URLSearchParams();
  if (fromDate) qs.set('fromDate', fromDate);
  if (toDate) qs.set('toDate', toDate);
  const query = qs.toString();
  return apiFetch(`/Reservations/GetAvailable/${propertyId}${query ? `?${query}` : ''}`);
}

export async function bookReservation(data) {
  return apiFetch('/Reservations/Book', {
    method: 'POST',
    body: JSON.stringify(data),
  });
}

// ─── Terms ───

export async function getTerms() {
  return apiFetch('/Terms/GetTerms');
}

// ─── Auth ───

export async function loginWithEmail(credential, password) {
  return authFetch('/Auth/LogInWithEmail', {
    credential,
    password,
    device: 0,
    appVersion: '1.0',
  });
}

export async function loginWithPhone(credential, password) {
  return authFetch('/Auth/LogInWithPhoneNumber', {
    credential,
    password,
    device: 0,
    appVersion: '1.0',
  });
}

export async function sendEmailOTP() {
  console.log('[Auth] Sending email OTP...');
  return apiFetch('/Auth/SendEmailOTP', { method: 'POST' });
}

export async function sendPhoneOTP() {
  console.log('[Auth] Sending phone OTP...');
  return apiFetch('/Auth/SendPhoneNumberOTP', { method: 'POST' });
}

export async function verifyEmail(code) {
  console.log('[Auth] Verifying email with code:', code);
  return authFetch(`/Auth/VerifyEmail?code=${encodeURIComponent(code)}`, {});
}

export async function verifyPhone(code) {
  console.log('[Auth] Verifying phone with code:', code);
  return authFetch(`/Auth/VerifyPhoneNumber?code=${encodeURIComponent(code)}`, {});
}

// Helpers
export function isEmail(value) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
}

export function isPhoneNumber(value) {
  return /^\+?\d{7,15}$/.test(value.replace(/[\s\-()]/g, ''));
}