require "sensitive"

class Config
  attr_accessor :cat

  attr_reader :jwt_secret, :session_secret

  def initialize(prefix = ENV_PREFIX, jwt_secret = nil, session_secret = nil, cat = nil)
    @prefix = prefix
    @cat = cat

    session_secret ||= ENV.fetch "SESSION_SECRET" do
      SecureRandom.hex SESSION_SECRET_HEX_LENGTH
    end

    jwt_secret ||= fetch_env "JWT_SECRET" do
      SecureRandom.hex JWT_SECRET_HEX_LENGTH
    end

    @session_secret = Sensitive.new session_secret
    @jwt_secret = Sensitive.new jwt_secret
    @cat ||= ENV.fetch "#{@prefix}_CAT", nil
  end

  def fetch_env(name, &)
    ENV.fetch "#{@prefix}_#{name}", &
  end

  def as_json(options = nil)
    {jwt_secret: jwt_secret, session_secret: @session_secret, cat: @cat}
  end

  def to_json(options = nil)
    if options&.key?(:pretty) &&
        options[:pretty] == true
      JSON.pretty_generate as_json(options)
    else
      JSON.generate as_json(options)
    end
  end

  def session_secret=(v)
    @session_secret = Sensitive.new v
  end

  def jwt_secret=(v)
    @jwt_secret = Sensitive.new v
  end
end