class GpsdBaudRate

# File lib/gpsd_baud_rate.rb, line 104
def self.baud_rate
  %x| sudo stty -F "#{@@device}"|.split('; ')[0].split(/\W+/)[1].to_i
end

# File lib/gpsd_baud_rate.rb, line 108
def self.baud_rate?(b_rate)
  b_rate==baud_rate
end

# File lib/gpsd_baud_rate.rb, line 75
def self.check_device?
  # Does the @@device exist and is it a character device
  # [[ ]] returns true (0) if 'file' exists
  "0\n" == %x| [ -c "#{@@device}" ] ; echo $?|

end

# File lib/gpsd_baud_rate.rb, line 82
def self.gpsd_active?
  arry = %x|sudo systemctl status "#{@@socket}"|.split(/\n/)
  s = arry.select!{ |e| e.include? "Active:"}[0].split(/\W+/)[2]
  s == 'active'
end

# File lib/gpsd_baud_rate.rb, line 95
def self.gpsd_start
  %x|sudo systemctl start "#{@@service}"|
  %x|sudo systemctl start "#{@@socket}"|
  sleep 1
  %x|sudo systemctl daemon-reload|
end

# File lib/gpsd_baud_rate.rb, line 88
def self.gpsd_stop
  %x|sudo systemctl stop "#{@@socket}"|
  %x|sudo systemctl stop "#{@@service}"|
  sleep 1
  %x|sudo systemctl daemon-reload|
end

# File lib/gpsd_baud_rate.rb, line 18
  def initialize goal_rate = @@baud_rates[0]

    @logger = new_logger path: "log/GpsdBaudRate.log", progname: "GpsdBaudRate", time_format: "'%Y-%m-%d %T.%N %z %Z'", level: Logger::DEBUG
    @logger.info "GpsdBaudRate Gem - Version: #{@@version}"

    unless self.class.check_device?
      msg = "Device: #{@@device} not found"
      @logger.error msg
      raise StandardError.new msg
    else
      @logger.info "Device: #{@@device} Okay"
    end
#    pid= %x|pgrep -f "ruby /home/deploy/bin/set_baud.rb"|
#    @logger.debug "Pid:  #{pid}, $$: #{$$}, $BASHPID: #{$BASHPID}"

    @goal_rate = goal_rate.to_i
    @logger.debug  "Goal_rate: #{@goal_rate}"
  end

# File lib/gpsd_baud_rate.rb, line 113
def baud_rate=( b_rate)
  msg= %x| sudo stty #{b_rate} -F "#{@@device}"|
  msg.each {|m| @logger.debug m}
end

# File lib/gpsd_baud_rate.rb, line 37
  def set_baud_rate b_rate = @goal_rate
    @logger.debug "In set_baud_rate"
    GpsdBaudRate::gpsd_start unless GpsdBaudRate::gpsd_active?   #make sure it's running

    @logger.debug "Service Status: #{GpsdBaudRate::gpsd_active?}"
    @logger.debug "Baud Rate: #{active_rate = GpsdBaudRate::baud_rate}"
    GpsdBaudRate::gpsd_stop
    @logger.debug "Service Status: #{GpsdBaudRate::gpsd_active?}"
    @logger.debug "Baud Rate: #{inactive_rate = GpsdBaudRate::baud_rate}"

    if active_rate == b_rate
      @logger.debug "Already at Goal Baud Rate"
    else
      @logger.debug "~~~~~~~~~~~~ Read at #{active_rate} baud ~~~~~~~~~~~~~~"
      unless (read_from_device active_rate)
        @logger.debug "Read at #{active_rate} baud Failed"
      else
        @logger.debug "Setting Goal Rate (#{b_rate})"
        set_PMTK_baud_rate active_rate, b_rate
        @logger.debug "Attempting Read at #{b_rate}"
        if read_from_device b_rate
          @logger.debug "Baud Rate Modification Successful"
          @logger.debug "Goal Baud Rate (#{b_rate}) has been set"
        else
          @logger.debug "Setting Baud Rate Failed"
        end
      end
    end
#
#   Cleanup
    GpsdBaudRate::gpsd_start
    @logger.debug "Service Status: #{GpsdBaudRate::gpsd_active?}"

  end

# File lib/gpsd_baud_rate.rb, line 120
def test_baud_rate b_rate
  read_from_device b_rate
end

# File lib/gpsd_baud_rate.rb, line 196
def find_baud_rate
  @logger.debug %x| sudo stty -F "#{@@device}"|
  GpsdBaudRate::gpsd_stop
  @logger.debug %x|sudo stty -F "#{@@device}"|
  GpsdBaudRate::gpsd_start
end

# File lib/gpsd_baud_rate.rb, line 223
def new_logger( progname: nil, path:, format: nil, time_format: nil, level:  LOG_LEVELS[:debug])
  logger = Logger.new(path)
  logger.progname = progname if progname
  logger.format = format if format
  logger.level = level if level
  logger.datetime_format = time_format if time_format
  logger
end

# File lib/gpsd_baud_rate.rb, line 210
def nmea_checksum cmmd
  @logger.debug "In nmea_checksum, cmmd: #{cmmd}"
  sum=0
  cmmd.each_byte { |i| sum = sum ^ i.ord}
  sum = sum & 0xff
  new_cmmd = "\$#{cmmd}*#{sum.to_s(16)}".upcase
  @logger.debug "new_cmmd: #{new_cmmd}"
  new_cmmd
end

# File lib/gpsd_baud_rate.rb, line 130
def read_from_device( baud)
  GpsdBaudRate::gpsd_stop
  begin
    results = []
    count = 0
    ser = SerialPort.open(@@device, baud.to_i, 8, 1, SerialPort::NONE ) { |ser|
      ser.read_timeout = 900
      @logger.debug "ReadTimeout: #{ser.read_timeout} ms"
      5.times { results << ser.readline(100)}
      results.each { |s| @logger.debug s.strip!}
      results.each do |r|
        count += 1 if @@NMEA_sentences.any? { |s| s == r[0,6]}
      end
      @logger.debug "Count: #{count}"
    }
  rescue IOError => e
    @logger.debug "IOError: #{e.inspect}"
  rescue  => e
    @logger.debug "Error: #{e.inspect}"
  end
  @logger.debug "SerialPort Closed"
  GpsdBaudRate::gpsd_start
  count >= 2
end

# File lib/gpsd_baud_rate.rb, line 203
def set_PMTK_baud_rate active_rate, goal_rate
  @logger.debug "In set_PMTK_baud_rate"
  type = 251
  cmmd = nmea_checksum("PMTK#{type},#{goal_rate}")
  write_to_device cmmd, active_rate
end

# File lib/gpsd_baud_rate.rb, line 155
def write_to_device cmmd, active_rate
  count=0
  results=[]
  GpsdBaudRate::gpsd_stop

  begin
    @logger.debug "In write_to_device"
    @logger.debug "cmmd: #{cmmd}, class: #{cmmd.class}"
    @logger.debug "baud: #{active_rate}, class: #{active_rate.class}"
    @logger.debug "Send to device @ #{active_rate}"
    ser = SerialPort.open( @@device, active_rate, 8, 1, SerialPort::NONE) { |ser|
      count = ser.write cmmd+"\r\n"
    }
  rescue IOError => e
    @logger.debug "IOError: #{e.inspect}"
  rescue  => e
    @logger.debug "Error: #{e.inspect}"
  end
  @logger.debug "Bytes Written: #{count}"

  @logger.debug "Sleeping 1/2 second..."
  sleep 0.5

  begin
    @logger.debug "Receive response @ #{@goal_rate}, #{@goal_rate.class}"
    ser = SerialPort.open( @@device, @goal_rate, 8, 1, SerialPort::NONE) { |ser|
      ser.read_timeout = 900
      10.times {results << ser.readline(100)}
    }
  rescue IOError => e
    @logger.debug "IOError: #{e.inspect}"
  rescue  => e
    @logger.debug "Error: #{e.inspect}"
  end
  results.each { |r| @logger.debug "Results: #{r.strip!}"}

  GpsdBaudRate::gpsd_start

end