/**
 * SocioWire frontend API client
 */

const API_BASE = "/api";

/**
 * Récupère la liste des posts, avec filtres optionnels.
 */
export async function fetchPosts(filters = {}) {
  const params = new URLSearchParams();

  if (filters.category) params.set("category", filters.category);
  if (filters.subCategory) params.set("sub_category", filters.subCategory);
  if (filters.time) params.set("time", filters.time);
  if (typeof filters.lat === "number") params.set("lat", String(filters.lat));
  if (typeof filters.lon === "number") params.set("lon", String(filters.lon));
  if (typeof filters.radiusKm === "number") {
    params.set("radius_km", String(filters.radiusKm));
  }

  const qs = params.toString();
  const url = qs ? `${API_BASE}/posts?${qs}` : `${API_BASE}/posts`;

  const res = await fetch(url, {
    credentials: "include",
  });

  if (!res.ok) {
    console.error("fetchPosts failed", res.status);
    throw new Error("Failed to load posts");
  }

  const data = await res.json();
  return Array.isArray(data) ? data : data.items || [];
}

/**
 * Récupère la position approx de l'utilisateur depuis le backend.
 */
export async function fetchIpLocation() {
  try {
    const res = await fetch(`${API_BASE}/ip-location`, {
      credentials: "include",
    });

    if (!res.ok) {
      console.warn("fetchIpLocation: HTTP", res.status);
      return null;
    }

    const text = await res.text();
    if (!text || text === "null") {
      return null;
    }

    let data;
    try {
      data = JSON.parse(text);
    } catch (e) {
      console.warn("fetchIpLocation: JSON parse error", e, text);
      return null;
    }

    const lat = data.lat;
    const lon = data.lon;

    if (
      typeof lat === "number" &&
      typeof lon === "number" &&
      !Number.isNaN(lat) &&
      !Number.isNaN(lon)
    ) {
      return [lon, lat]; // [lng, lat]
    }

    console.warn("fetchIpLocation: invalid payload", data);
    return null;
  } catch (err) {
    console.warn("fetchIpLocation: network error", err);
    return null;
  }
}

/**
 * Crée un nouveau post
 * token: access token Keycloak (string) ou null
 */
export async function createPost(payload, token) {
  const headers = {
    "Content-Type": "application/json",
  };
  if (token) {
    headers["Authorization"] = `Bearer ${token}`;
  }

  const res = await fetch(`${API_BASE}/post`, {
    method: "POST",
    headers,
    credentials: "include",
    body: JSON.stringify(payload),
  });

  if (!res.ok) {
    const text = await res.text().catch(() => "");
    console.error("createPost failed", res.status, text);
    throw new Error("Failed to create post");
  }

  return res.json().catch(() => ({}));
}

/**
 * Crée un nouvel utilisateur via le backend
 * (backend: POST /api/signup)
 * payload: { username, email, password, firstName, lastName }
 */
export async function registerUser(payload) {
  const res = await fetch(`${API_BASE}/signup`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    credentials: "include",
    body: JSON.stringify(payload),
  });

  if (!res.ok) {
    const text = await res.text().catch(() => "");
    console.error("registerUser failed", res.status, text);
    throw new Error(text || "Failed to register user");
  }

  return res.json().catch(() => ({}));
}