import { version } from './version'

/** Current session will be checked for refresh at this interval. */
export const AUTO_REFRESH_TICK_DURATION_MS = 30 * 1000

/**
 * A token refresh will be attempted this many ticks before the current session expires. */
export const AUTO_REFRESH_TICK_THRESHOLD = 3

/*
 * Earliest time before an access token expires that the session should be refreshed.
 */
export const EXPIRY_MARGIN_MS = AUTO_REFRESH_TICK_THRESHOLD * AUTO_REFRESH_TICK_DURATION_MS

/**
 * After a refresh fails, serial callers (including the next auto-refresh
 * tick) within this window receive the cached failure instead of firing
 * another /token request. Two ticks: each outage burns at most one /token
 * call per cooldown window. Cleared on any successful refresh (locally or
 * via BroadcastChannel from another tab) and on `_removeSession`.
 */
export const REFRESH_FAILURE_COOLDOWN_MS = 2 * AUTO_REFRESH_TICK_DURATION_MS

export const GOTRUE_URL = 'http://localhost:9999'
export const STORAGE_KEY = 'supabase.auth.token'
export const AUDIENCE = ''
export const DEFAULT_HEADERS = { 'X-Client-Info': `gotrue-js/${version}` }
export const NETWORK_FAILURE = {
  MAX_RETRIES: 10,
  RETRY_INTERVAL: 2, // in deciseconds
}

export const API_VERSION_HEADER_NAME = 'X-Supabase-Api-Version'
export const API_VERSIONS = {
  '2024-01-01': {
    timestamp: Date.parse('2024-01-01T00:00:00.0Z'),
    name: '2024-01-01',
  },
}

export const BASE64URL_REGEX = /^([a-z0-9_-]{4})*($|[a-z0-9_-]{3}$|[a-z0-9_-]{2}$)$/i

/**
 * Reserved query parameter appended to `redirectTo` URLs (behind
 * `experimental.appendPkceFlowIdToRedirects`) that correlates a PKCE callback
 * with the code verifier stored when its flow started. It round-trips through
 * the auth server untouched and identifies a verifier slot in storage — the
 * verifier itself never appears in a URL.
 */
export const PKCE_FLOW_ID_PARAM = 'sb_flow_id'

/**
 * Maximum number of PKCE code verifiers kept in storage at once. Starting a
 * new flow beyond this evicts the oldest pending verifier.
 */
export const PKCE_MAX_CONCURRENT_FLOWS = 5

export const JWKS_TTL = 10 * 60 * 1000 // 10 minutes