#!/usr/bin/env ruby

require 'optparse'
require 'gls_agent'
require 'json'

options = {}

# Get defaults from ~/.gls_agent
begin
  filecontent = File.open("#{Dir.home}/.gls_agent").read
  # from option=value\noption2=value2 make {'option':'value','option2':'value2'}
  filecontent.gsub!(/ *= */, ':')
  filecontent.gsub!(/(\w+)/, '"\1"')
  filecontent.gsub!("\n", ",\n")
  filecontent.chomp!("\n")
  filecontent.chomp!(',')
  filecontent = "{ #{filecontent} }"
  begin
    j_options = JSON.parse filecontent
    j_options.each {|o,v| options[o.to_sym] = v}
    puts "Info: read configuration parameters from ~/.gls_agent, may be overriden with cmd line options."
  rescue
    STDERR.puts "Error: configuration file in ~/.gls_agent found but could not be parsed."
    STDERR.puts $!.inspect,$@
  end
rescue
  STDERR.puts "Info: No configuration file in ~/.gls_agent found, all options need to be specified on command line."
end

optparse = OptionParser.new do |opts|
  opts.on('-l', '--label-data DATA', 'label data, comma-separated.') do |l|
    fields = l.split(',')
    if fields.length != 6
      STDERR.puts 'Error: label data has to be in format "John Doe,Home Street,1,1234,City,1".'
      exit 1
    end
    options[:name] = fields.shift
    options[:street] = fields.shift
    options[:streetno] = fields.shift
    options[:zip] = fields.shift
    options[:city] = fields.shift
    options[:weight] = fields.shift
  end
  opts.on('-u', '--gls-user GLSUSER', 'username of GLS account.') do |u|
    options[:user] = u
  end
  opts.on('-p', '--gls-password GLSPASSWORD', 'password of GLS account.') do |p|
    options[:pass] = p
  end
  opts.on('-o', '--output-file FILE', 'Write output (pdf) to FILE') do |o|
    options[:output_file] = o
  end
  opts.on('-h', '--help', 'Show help.') do
    puts opts
    exit 0
  end
end

optparse.parse!

if !options[:user] || !options[:pass]
  STDERR.puts 'Error: Need to specify user and pass in ~/.gls_agent or -u -p .'
  exit 1
end

if !options[:name] || !options[:street] || !options[:streetno] || !options[:zip] || !options[:city] || !options[:weight]
  STDERR.puts 'Error: Need to specify delivery data in ~/.gls_agent or -l .'
  exit 1
end

options[:output_file] ||= 'gls-label.pdf'

parcel = GLSAgent::ParcelJob.new(options[:name], options[:street], options[:streetno], options[:zip], options[:city], options[:weight])

mech = GLSMech.new
mech.user = options[:user]
mech.pass = options[:pass]

pdf_file_path = mech.save_parcel_label parcel, options[:output_file]
if pdf_file_path != options[:output_file]
  STDERR.puts "Warning: #{options[:output_file]} already exists, saved to #{pdf_file_path} instead!."
else
  puts "Success: Saved label to #{pdf_file_path}."
end

# Be cool, explicitely.
exit 0