#!/usr/bin/env ruby

require 'date'
require 'liquid'
require 'optparse'
require 'ostruct'

OPTIONS = OpenStruct.new

# Default options
OPTIONS.format = '%A %d %B'
OPTIONS.subject = ''
OPTIONS.dates = [`LC_ALL=C date +'#{OPTIONS.format}'`.chop!]

opts = OptionParser.new do |opts|
  opts.on('-v', '--verbose') do |verbose|
    OPTIONS.verbose = verbose
  end
  opts.on('-l', '--locale LOCALE') do |locale|
    OPTIONS.locale = locale
  end
  opts.on('-s', '--format FORMAT') do |format|
    OPTIONS.format = format
  end
  opts.on('-t', '--template TEMPLATE') do |template|
    OPTIONS.template = template
  end
  opts.on('-d', '--date DATE', '--dates DATES') do |dates|
    OPTIONS.dates = dates.split
  end
  opts.on('-t', '--to TO') do |to|
    to.gsub!(',', ' ')
    OPTIONS.to = to.split(' ')
    OPTIONS.to.collect! {|to| "'#{to}'"}
  end
  opts.on('-e', '--encrypt-to RECIPIENT') do |recipient|
    OPTIONS.recipient = recipient
  end
  opts.on('-f', '--from FROM') do |from|
    OPTIONS.from = from
  end
  opts.on('-s', '--subject SUBJECT') do |subject|
    OPTIONS.subject = subject
  end
end
opts.parse!(ARGV)

OPTIONS.dates.collect! {|date| `LC_ALL="#{OPTIONS.locale}" date --date='#{date}' +'#{OPTIONS.format}'`.chop!}
file = File.readlines(OPTIONS.template).join()
template = Liquid::Template.parse(file)
email = template.render( 'date' => OPTIONS.dates[0], 'dates' => OPTIONS.dates )

if OPTIONS.recipient
  puts "gpg --encrypt --armor --trust-model always --default-recipient #{OPTIONS.recipient}" if OPTIONS.verbose
  gpg = IO.popen("gpg --encrypt --armor --trust-model always --default-recipient #{OPTIONS.recipient}", 'w+')
  gpg.puts email
  gpg.close_write
  email = gpg.readlines.join()
end

if OPTIONS.to
  if OPTIONS.from
    puts "mutt -e 'set send_charset=utf-8' -e 'set from=#{OPTIONS.from}' -s '#{OPTIONS.subject}' -- #{OPTIONS.to.join(' ')}" if OPTIONS.verbose
    mutt = IO.popen("mutt -e 'set send_charset=utf-8' -e 'set from=#{OPTIONS.from}' -s '#{OPTIONS.subject}' -- #{OPTIONS.to.join(' ')}", 'w+')
  else
    puts "mutt -s '#{OPTIONS.subject}' -- #{OPTIONS.to.join(' ')}" if OPTIONS.verbose
    mutt = IO.popen("mutt -s '#{OPTIONS.subject}' -- #{OPTIONS.to.join(' ')}", 'w+')
  end
  mutt.puts email
  mutt.close_write
else
  if OPTIONS.subject.length > 0
    puts OPTIONS.subject
    puts "="*OPTIONS.subject.length
    puts
  end
  puts email
end