class KPM::TenantConfig

def call_client(key_prefix)
  KillBillClient.url = @killbill_url
  KillBillClient.logger = @logger
  options = {
    username: @killbill_user,
    password: @killbill_password,
    api_key: @killbill_api_key,
    api_secret: @killbill_api_secret
  }
  begin
    KillBillClient::Model::Tenant.search_tenant_config(key_prefix, options)
  rescue KillBillClient::API::Unauthorized
    raise ArgumentError, "Unable to export tenant details, wrong credentials? username=#{@killbill_user}, password=#{mask(@killbill_password)}, api_key=#{@killbill_api_key}, api_secret=#{mask(@killbill_api_secret)}"
  end
end

def export(key_prefix = nil)
  export_data = fetch_export_data(key_prefix)
  raise ArgumentError, "Data for key_prefix=#{key_prefix} not found" if export_data.empty?
  export_file = store_into_file(export_data)
  @logger.info "\e[32mData exported under #{export_file}\e[0m"
  export_file
end

def fetch_export_data(key_prefix)
  tenant_config = []
  pefixes = key_prefix.nil? ? KEY_PREFIXES : [key_prefix]
  pefixes.each do |prefix|
    config_data = call_client(prefix)
    if !config_data.empty?
      config_data.each { |data| tenant_config << data }
      @logger.debug "Data for key prefix \e[1m#{prefix}\e[0m was \e[1mfound and is ready to be exported\e[0m."
    else
      @logger.debug "Data for key prefix \e[1m#{prefix}\e[0m was \e[31mnot found\e[0m."
    end
  end
  tenant_config
end

def initialize(killbill_api_credentials = nil, killbill_credentials = nil, killbill_url = nil, logger = nil)
  @killbill_api_key = KILLBILL_API_KEY
  @killbill_api_secret = KILLBILL_API_SECRET
  @killbill_url = KILLBILL_URL
  @killbill_user = KILLBILL_USER
  @killbill_password = KILLBILL_PASSWORD
  @logger = logger
  set_killbill_options(killbill_api_credentials, killbill_credentials, killbill_url)
end

def mask(string, all_but = 3, char = '*')
  string.gsub(/.(?=.{#{all_but}})/, char)
end

def set_killbill_options(killbill_api_credentials, killbill_credentials, killbill_url)
  unless killbill_api_credentials.nil?
    @killbill_api_key = killbill_api_credentials[0]
    @killbill_api_secret = killbill_api_credentials[1]
  end
  unless killbill_credentials.nil?
    @killbill_user = killbill_credentials[0]
    @killbill_password = killbill_credentials[1]
  end
  @killbill_url = killbill_url unless killbill_url.nil?
end

def store_into_file(export_data)
  export_file = TMP_DIR + File::SEPARATOR + 'kbdump'
  File.open(export_file, 'w') { |io| io.puts export_data.to_json }
  export_file
end