module Flucti
  module Utilities
    module Miscellaneous
      extend self
      
      BOGUS_ERROR_MESSAGES = ['error']
      
      def try_save(*resources)
        resources.each do |resource|
          begin
            resource.save
          rescue WebService::ResourceInvalid
            error! $!.response.data, "(While attempting to save resource #{q resource}: #{resource.inspect}.)"
          end
        end
        yield
      end

      def error!(messages, note=nil, io=$stderr)
        messages = messages['errors'] if messages.respond_to?(:[]) && messages.include?('errors')
        messages = messages['error']  if messages.respond_to?(:[]) && messages.include?('error')
        messages = [messages].flatten.compact - BOGUS_ERROR_MESSAGES
        messages << "An unknown error occured while processing your request." if messages.empty?
        if method(:exit).arity == -1
          puts_title(messages.size == 1 ? "Error" : "Errors", io)
          io.puts(note, "\n") if note
          messages.each do |message|
            puts_long("! #{message.lstrip}", io)
          end
          exit 1
        else
          raise messages.map { |msg| msg.split("\n") }.flatten.map { |line| line.strip }.join(' ')
        end
      end
      
      def command(task_name=nil)
        @program ||= ((path = Pathname($0)).absolute? ? path.basename : path).to_s
        [@program, task_name].compact.join(' ')
      end

      def sh(command)
        command = command.to_s
        displayable_command = command[0,20]
        displayable_command += "..." if command.length > 20

        print "Running locally: #{displayable_command} "
        succeeded = system(command)

        if succeeded
          print "Done\n"
        else
          raise "command #{q displayable_command} failed (status: #{$?.exitstatus})"
        end
      end
      
      def clean_name(name)
        name.to_s.
          gsub(/["']/, '').
          gsub(/[^a-z0-9]+/i, "-").
          gsub(/^\-|\-$/, '').
          downcase
      end
    end
  end
end