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#
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#
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module Qpid::Proton::Util

  # Provides mixin functionality for dealing with exception conditions.
  #
  # @private
  module ErrorHandler

    def self.included(other) other.extend(self); end

    def can_raise_error(method_names, options = {})
      error_class = options[:error_class]
      below = options[:below] || 0
      # coerce the names to be an array
      Array(method_names).each do |method_name|
        raise "missing method #{method_name.inspect}" unless method_defined?(method_name) || private_method_defined?(method_name)
        create_exception_handler_wrapper(method_name, error_class, below)
      end
    end

    def create_exception_handler_wrapper(method_name, error_class = nil, below = 0)
      original_method_name = method_name.to_s
      wrapped_method_name = "_excwrap_#{original_method_name}"
      alias_method wrapped_method_name, original_method_name
      define_method original_method_name do |*args, &block|
        # need to get a reference to the method object itself since
        # calls to Class.send interfere with Messenger.send
        method = self.method(wrapped_method_name.to_sym)
        rc = method.call(*args, &block)
        check_for_error(rc, error_class) if rc < below
        return rc
      end
    end

    # Raises an Proton-specific error if a return code is non-zero.
    #
    # Expects the class to provide an +error+ method.
    def check_for_error(code, error_class = nil)

      raise ::ArgumentError.new("Invalid error code: #{code}") if code.nil?

      return code if code > 0

      case(code)

      when Qpid::Proton::Error::NONE
        return

      when Qpid::Proton::Error::EOS
        raise Qpid::Proton::EOSError.new(self.error)

      when Qpid::Proton::Error::ERROR
        raise Qpid::Proton::ProtonError.new(self.error)

      when Qpid::Proton::Error::OVERFLOW
        raise Qpid::Proton::OverflowError.new(self.error)

      when Qpid::Proton::Error::UNDERFLOW
        raise Qpid::Proton::UnderflowError.new(self.error)

      when Qpid::Proton::Error::ARGUMENT
        raise Qpid::Proton::ArgumentError.new(self.error)

      when Qpid::Proton::Error::STATE
        raise Qpid::Proton::StateError.new(self.error)

      when Qpid::Proton::Error::TIMEOUT
        raise Qpid::Proton::TimeoutError.new(self.error)

      when Qpid::Proton::Error::INPROGRESS
        return

      when Qpid::Proton::Error::INTERRUPTED
        raise Qpid::Proton::InterruptedError.new(self.error)

      when Qpid::Proton::Error::INPROGRESS
        raise Qpid::Proton::InProgressError.new(self.error)

      else

        raise ::ArgumentError.new("Unknown error code: #{code}")

      end

    end

  end

end