/**
 * Application constants with environment variable support.
 */

// Timeouts (milliseconds)
export const COT_AUTH_TIMEOUT_MS = Number(process.env.COT_AUTH_TIMEOUT_MS) || 15_000
export const LIVE_SESSION_TTL_MS = Number(process.env.LIVE_SESSION_TTL_MS) || 60_000
export const COT_ENTITY_TTL_MS = Number(process.env.COT_ENTITY_TTL_MS) || 90_000
export const POLL_INTERVAL_MS = Number(process.env.POLL_INTERVAL_MS) || 1500
export const SHUTDOWN_TIMEOUT_MS = Number(process.env.SHUTDOWN_TIMEOUT_MS) || 30_000

// Ports
export const COT_PORT = Number(process.env.COT_PORT) || 8089
export const WEBSOCKET_PATH = process.env.WEBSOCKET_PATH || '/ws'

// Limits
export const MAX_PAYLOAD_BYTES = Number(process.env.MAX_PAYLOAD_BYTES) || 64 * 1024
export const MAX_STRING_LENGTH = Number(process.env.MAX_STRING_LENGTH) || 1000
export const MAX_IDENTIFIER_LENGTH = Number(process.env.MAX_IDENTIFIER_LENGTH) || 255

// Mediasoup
export const MEDIASOUP_RTC_MIN_PORT = Number(process.env.MEDIASOUP_RTC_MIN_PORT) || 40000
export const MEDIASOUP_RTC_MAX_PORT = Number(process.env.MEDIASOUP_RTC_MAX_PORT) || 49999

// Session
const [MIN_DAYS, MAX_DAYS, DEFAULT_DAYS] = [1, 365, 7]
export function getSessionMaxAgeDays() {
  const raw = Number.parseInt(process.env.SESSION_MAX_AGE_DAYS ?? '', 10)
  return Number.isFinite(raw) ? Math.max(MIN_DAYS, Math.min(MAX_DAYS, raw)) : DEFAULT_DAYS
}