# Generates a JSON Web Token (JWT) for a given user. Typically placed in the
# `Authorization` header, or used a password to gain access to the MQTT server.
class SessionToken < AbstractJwtToken
  MUST_VERIFY = "Verify account first"
  MQTT = ENV.fetch("MQTT_HOST")
  # No beta URL provided? Then provide the latest stable.
  DEFAULT_BETA_URL =
    "https://api.github.com/repos/FarmBot/farmbot_os/releases/latest"
  # If you are not using the standard MQTT broker (eg: you use a 3rd party
  # MQTT vendor), you will need to change this line.
  DEFAULT_MQTT_WS =
    "#{ENV["FORCE_SSL"] ? "wss://" : "ws://"}#{ENV.fetch("MQTT_HOST")}:3002/ws"
  MQTT_WS = ENV["MQTT_WS"] || DEFAULT_MQTT_WS
  EXPIRY = 40.days
  VHOST = ENV.fetch("MQTT_VHOST") { "/" }
  BETA_OS_URL   = ENV["BETA_OTA_URL"] || DEFAULT_BETA_URL
  DEFAULT_OS    = "https://api.github.com/repos/farmbot/farmbot_os/releases" +
  "/latest"
  # Originally imported from `CalculateVersion` mutation (check source control
  # for context) - RC
  OS_RELEASE_SERVER = ENV.fetch("OS_UPDATE_SERVER", DEFAULT_OS)

  def self.issue_to(user,
                    iat: Time.now.to_i,
                    exp: EXPIRY.from_now.to_i,
                    iss: $API_URL,
                    aud: AbstractJwtToken::UNKNOWN_AUD,
                    fbos_version:) # Gem::Version
    unless user.verified?
      Rollbar.info("Verification Error", email: user.email)
      raise Errors::Forbidden, MUST_VERIFY
    end
    jti = SecureRandom.uuid
    TokenIssuance.create!(device_id: user.device.id, exp: exp, jti: jti)
    self.new([{ aud: aud,
               sub: user.id,
               iat: iat,
               jti: jti,
               iss: iss,
               exp: exp,
               mqtt: MQTT,
               bot: "device_#{user.device.id}",
               vhost: VHOST,
               mqtt_ws: MQTT_WS,
               os_update_server: OS_RELEASE_SERVER,
               beta_os_update_server: BETA_OS_URL }])
  end

  def self.as_json(user, aud, fbos_version, exp = EXPIRY.from_now.to_i)
    { token: SessionToken.issue_to(user, iss: $API_URL,
                                         aud: aud,
                                         exp: exp,
                                         fbos_version: fbos_version),
      user: user }
  end
end