module Sapos
  module Print
    class Printer
      
      def initialize(config)
        @config = config
      end
      
      def print(raw_message)        
        puts "Print =>"
        filename = SecureRandom.hex
        result = false
        raw = raw_message.force_encoding("UTF-8")
        begin
          printable = data(raw_message)
          File.open(filename, 'w'){|f| f.write(printable)}
          result  = send_to_printer({file: filename})
          puts "Result: #{result}"
        rescue => e
          puts "#{e.message}"
          self.errors = e.message
          result = false
        ensure
          File.delete(filename) if File.exists?(filename)
          return result
        end        
        
      end
      
      def data(raw_message)
        puts "data: #{@config.interface}"
        case @config.interface
        when 'text'
          return raw_message
        when 'escp'
          esc = "\x1B" #ESC byte in hex notation
          newLine = "\x0A" #LF byte in hex notation
          cmds  = esc + "@"
          cmds += esc + "!"+"\00"
          cmds += raw_message
          cmds += newLine + newLine
          cmds += "\x1D\x56\x42\x03" # Cut Paper
          cmds += "\x1B\x70\x00\x19\xFA" # Open drawer
          return cmds
        else
          raise "Unknown interface: #{@config.interface}"
        end
      end
      
      def send_to_printer(opts = {})
        case @config.adapter
        when 'console'
          puts "=> CONSOLE: file: #{opts[:file]}<="
          puts File.read(opts[:file])
          puts "=> END CONSOLE =<"
          return true
        when 'cups'
          file = opts.delete(:file)
          command_options = []
          command_options << "-d #{@printer_name}"
          command_options << "-o raw" if opts[:raw].present?
          command = "lp #{command_options.join(" ")} #{file}"
          puts "CMD => #{command}"
          if !system(command)
            puts "Not executed"
            return false
          end
          return true
          
        when 'windows'
          command = "copy #{opts[:file]} "+'"\\\\%COMPUTERNAME%\\'+@config.printer
          if !system(command)
            puts "Not executed"
            return false
          end
          return true
          
        end
      end
      
    end
  end
end