require 'rubygems'
# not necessary with ruby 1.9 but included for completeness
require 'twilio-ruby'
# put your own credentials here
account_sid = ''
auth_token = ''
#from_number = '+17632960700' # BEST
#from_number = "+17632960600" # Mastery
#sms_filename = 'sms_numbers.csv' # file with CSV data in it

def clean_data(data_row)
  data = data_row.split(",", 2)
  orig_to_number = data[0]
  to_number = data[0].gsub(/[^0-9+]+/, "") #strip everything but numbers and + sign
  sms_message = data[1].strip
  # strip lead/lag " and replace literal "\n" with actual newline
  sms_message.gsub!(/\A"|"\Z/, '')
  sms_message.gsub!('\n', "\n")
  if to_number.length != 12 then
    raise("To number incorrect length: #{to_number} (#{orig_to_number})")
  end
  [to_number, sms_message]
end

def send_message(from_number, to_number, sms_message, sms_client)
  sms_client.messages.create({
    :from => from_number,
    :to => to_number,
    :body => sms_message
  })
end

def prepare_arguments(arguments)
  puts "Arguments used: #{arguments.inspect}"

  if arguments.length != 2 then
    raise "Arguments required: [BEST|Mastery] [filename]"
  end
  school_name = arguments[0]
  case school_name
  when "BEST"
    from_number = '+17632960700' # BEST
  when "Mastery"
    from_number = "+17632960600" # Mastery
  else
    raise "Arg 1: must be either BEST or Mastery"
  end

  sms_filename = arguments[1]
  if !FileTest.file?(sms_filename) then
    raise "Arg 2: File must exist"
  end

  puts "Sending to number: #{sms_filename}"
  [from_number, sms_filename]
end

##MAIIN START

from_number, sms_filename = prepare_arguments(ARGV)

# set up a client to talk to the Twilio REST API
sms_client = Twilio::REST::Client.new account_sid, auth_token
num_sent = 1
File.open(sms_filename, "r") do |file|
  file.each_line do |line|
    begin #rescue
      sleep 1.25 # keep the message sending velocity low
      puts "- Processing line number: #{num_sent}"
      to_number, sms_message = clean_data(line)
      puts "  Fr:#{from_number} To:#{to_number} Msg:#{sms_message}"
      send_message(from_number, to_number, sms_message, sms_client)
      num_sent = num_sent + 1
    rescue Exception => ex
      puts "**Exception raised on number #{to_number}\n  Error: #{ex.message}"
      next # don't re-raise the error, just skip to the next message
    end
  end
end