const axios = require('axios');
const config = require('../config');

const merakiAxios = axios.create({
  baseURL: config.meraki.baseUrl,
  headers: {
    'X-Cisco-Meraki-API-Key': config.meraki.apiKey,
    'Content-Type': 'application/json'
  }
});

// In-memory cache
let cachedNetworks = [];
let lastCacheTime = 0;
const CACHE_TTL_MS = 4 * 60 * 60 * 1000; // 4 hours

async function refreshMerakiNetworksCache() {
  const start = Date.now();
  console.log('🔄 Refreshing Meraki networks cache...');

  try {
    const url = `/organizations/${config.meraki.orgId}/networks?perPage=5000`;
    const res = await merakiAxios.get(url);
    cachedNetworks = res.data || [];
    lastCacheTime = Date.now();

    console.log(`✅ Cached ${cachedNetworks.length} Meraki networks (${Date.now() - start}ms)`);
  } catch (err) {
    console.error('❌ Failed to refresh Meraki networks cache:', err.message);
  }
}

async function getMerakiNetworks(forceRefresh = false) {
  const now = Date.now();
  if (forceRefresh || cachedNetworks.length === 0 || (now - lastCacheTime > CACHE_TTL_MS)) {
    await refreshMerakiNetworksCache();
  }
  return cachedNetworks;
}

async function findMerakiNetwork(storeNum) {
  if (!storeNum) return null;

  const raw = String(storeNum).trim();
  const match = raw.match(/\d+/);
  if (!match) return null;

  let searchTerm = match[0].padStart(5, '0').slice(-5);

  const networks = await getMerakiNetworks();

  console.log(`🔍 Searching for store "${raw}" → 5-digit term "${searchTerm}"`);

  let bestMatch = null;
  let bestScore = -1;

  for (const net of networks) {
    const name = (net.name || '').toLowerCase();
    const term = searchTerm.toLowerCase();

    if (name.includes(term)) {
      const score = (name.includes(` ${term}`) || name.includes(`-${term}`) || name.includes(term + ' ')) ? 100 : 50;
      if (score > bestScore) {
        bestScore = score;
        bestMatch = net;
      }
    }
  }

  if (bestMatch) {
    console.log(`✅ Best Meraki match: ${bestMatch.name} (ID: ${bestMatch.id})`);
    return bestMatch;
  }

  console.log(`❌ No Meraki network found for store ${storeNum}`);
  return null;
}

async function getNetworkClients(networkId) {
  if (!networkId) return [];
  try {
    const res = await merakiAxios.get(`/networks/${networkId}/clients?timespan=7200`); // last 2 hours
    return res.data || [];
  } catch (err) {
    console.error(`❌ Failed to get clients for network ${networkId}:`, err.message);
    return [];
  }
}

async function getAllMerakiDevices(networkId) {
  if (!networkId) return [];
  try {
    const res = await merakiAxios.get(`/networks/${networkId}/devices`);
    return res.data || [];
  } catch (err) {
    console.error(`❌ Failed to get devices for network ${networkId}:`, err.message);
    return [];
  }
}

async function getMerakiDeviceAvailabilities(networkId) {
  if (!networkId || !config.meraki.orgId) return [];

  try {
    const res = await merakiAxios.get(
      `/organizations/${config.meraki.orgId}/devices/availabilities`,
      {
        params: { networkIds: [networkId] }
      }
    );
    return res.data || [];
  } catch (err) {
    console.error(`❌ Device availabilities failed:`, err.message);
    return [];
  }
}

async function getMerakiClients(networkId) {
  if (!networkId) return [];

  try {
    // 7 days = much better chance of catching registers & printers
    const timespanSeconds = 7 * 24 * 60 * 60;   // 604800

    const res = await merakiAxios.get(
      `/networks/${networkId}/clients?perPage=1000&timespan=${timespanSeconds}`
    );

    const clients = res.data || [];
    console.log(`✅ Fetched ${clients.length} Meraki clients (7-day timespan) [getMerakiClients]`);
    
    return clients;
  } catch (err) {
    console.error(`❌ Failed to fetch Meraki clients:`, err.message);
    return [];
  }
}

module.exports = {
  findMerakiNetwork,
  getNetworkClients,
  getMerakiClients,
  getAllMerakiDevices,
  getMerakiDeviceAvailabilities,
  refreshMerakiNetworksCache
};