/**
 * Staff presence detection — checks Discord presence status for staff members.
 * Requires GuildPresences intent enabled in Discord Developer Portal.
 */
const { CONFIG } = require('../config');

/**
 * Get categorized availability of all configured staff members.
 * @param {import('discord.js').Guild} guild
 * @returns {{ online: string[], dnd: string[], offline: string[], unknown: string[] }}
 */
function getStaffAvailability(guild) {
  const results = {
    online: [],
    dnd: [],
    offline: [],
    unknown: []
  };

  for (const staffId of CONFIG.STAFF_IDS) {
    const member = guild.members.cache.get(staffId);
    if (!member) { results.offline.push(staffId); continue; }

    const status = member.presence?.status;
    if (!status) { results.unknown.push(staffId); continue; }

    if (status === 'online' || status === 'idle') results.online.push(staffId);
    else if (status === 'dnd') results.dnd.push(staffId);
    else results.offline.push(staffId);
  }

  return results;
}

/**
 * Check if any staff member is currently available.
 * @param {import('discord.js').Guild} guild
 * @returns {{ available: boolean|null, source: string }}
 */
function isAnyStaffAvailable(guild) {
  const { online, dnd, unknown } = getStaffAvailability(guild);
  if (online.length > 0) return { available: true, source: 'presence' };
  if (CONFIG.STAFF_DND_COUNTS_AS_AVAILABLE && dnd.length > 0) return { available: true, source: 'presence_dnd' };
  if (unknown.length === CONFIG.STAFF_IDS.length) return { available: null, source: 'unknown' };
  return { available: false, source: 'presence' };
}

module.exports = { getStaffAvailability, isAnyStaffAvailable };