function b64Encode(obj) {
  return btoa(unescape(encodeURIComponent(JSON.stringify(obj))))
}

function b64Decode(str) {
  try {
    return JSON.parse(decodeURIComponent(escape(atob(str))))
  } catch {
    return null
  }
}

export function encodeSessionConfig(config) {
  return b64Encode(config)
}

export function decodeSessionConfig(encoded) {
  return b64Decode(encoded)
}

export function buildInterviewUrl(sessionId, config) {
  const base = `${window.location.origin}${window.location.pathname}`
  return `${base}#/interview/${sessionId}?cfg=${b64Encode(config)}`
}

export function buildWatchUrl(sessionId) {
  return `${window.location.origin}${window.location.pathname}#/watch/${sessionId}`
}