// 大神接单心跳：工作台/接单大厅/雷达页在前台时每 60 秒上报一次
// 服务端以 last_active_at 判断是否真实在线（10 分钟无心跳自动移出匹配池）
import { getUserLocation } from './location.js';
import { sendCompanionHeartbeat, normalizeUserId } from './api.js';

let timer = null;
let inFlight = false;
let lastSentAt = 0;
let coords = null;
let coordsAt = 0;

const COORD_TTL_MS = 5 * 60 * 1000;

async function resolveCoords() {
  if (coords && Date.now() - coordsAt < COORD_TTL_MS) return coords;
  try {
    const pos = await getUserLocation();
    coords = { lat: pos.latitude, lng: pos.longitude };
    coordsAt = Date.now();
    return coords;
  } catch (_) {
    // 用户拒绝定位时仍上报活跃时间，只是没有距离信息
    return coords;
  }
}

export async function sendHeartbeat(force = false) {
  if (inFlight) return;
  if (!force && Date.now() - lastSentAt < 45 * 1000) return;
  if (!normalizeUserId()) return;
  inFlight = true;
  try {
    const pos = await resolveCoords();
    await sendCompanionHeartbeat(pos || {});
    lastSentAt = Date.now();
  } catch (_) {
  } finally {
    inFlight = false;
  }
}

export function startHeartbeat(intervalMs = 60 * 1000) {
  if (timer) return;
  void sendHeartbeat(true);
  timer = setInterval(() => {
    void sendHeartbeat();
  }, Math.max(30 * 1000, Number(intervalMs) || 60 * 1000));
  if (timer && typeof timer.unref === 'function') timer.unref();
}

export function stopHeartbeat() {
  if (timer) {
    clearInterval(timer);
    timer = null;
  }
}

export function resetHeartbeatLocation() {
  coords = null;
  coordsAt = 0;
}