module Rmega
  module Errors

    # Check out the error codes list at https://mega.co.nz/#doc (section 11)
    CODES = {
      -1  => 'An internal error has occurred. Please submit a bug report, detailing the exact circumstances in which this error occurred.',
      -2  => 'You have passed invalid arguments to this command.',
      -3  => 'A temporary congestion or server malfunction prevented your request from being processed. No data was altered. Retry. Retries must be spaced with exponential backoff.',
      -4  => 'You have exceeded your command weight per time quota. Please wait a few seconds, then try again (this should never happen in sane real-life applications).',
      -5  => 'The upload failed. Please restart it from scratch.',
      -6  => 'Too many concurrent IP addresses are accessing this upload target URL.',
      -7  => 'The upload file packet is out of range or not starting and ending on a chunk boundary.',
      -8  => 'The upload target URL you are trying to access has expired. Please request a fresh one.',
      -9  => 'Object (typically, node or user) not found',
      -10 => 'Circular linkage attempted',
      -11 => 'Access violation (e.g., trying to write to a read-only share)',
      -12 => 'Trying to create an object that already exists',
      -13 => 'Trying to access an incomplete resource',
      -14 => 'A decryption operation failed (never returned by the API)',
      -15 => 'Invalid or expired user session, please relogin',
      -16 => 'User blocked',
      -17 => 'Request over quota',
      -18 => 'Resource temporarily not available, please try again later',
      -19 => 'Too many connections on this resource',
      -20 => 'Write failed',
      -21 => 'Read failed',
      -22 => 'Invalid application key; request not processed',
    }.freeze

    class ServerError < StandardError
      attr_reader :code, :message
      attr_accessor :temporary

      def initialize(value, opts = {})
        if msg = Errors::CODES[value.to_i]
          @code = value.to_i
          @message = msg || "Error code #{@code}"
        else
          @message = value
        end

        self.temporary = opts[:temporary] || false

        super(@message)
      end

      def temporary?
        self.temporary || [-3, -18, -6].include?(@code)
      end
    end
  end

  # Backward compatibility
  RequestError = Errors::ServerError
end