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#!/usr/bin/env ruby
# Ag -- archiving all the 'golden' flamewars on -dev
# Alex Legler <a3li@gentoo.org>

require 'bundler/setup'
require 'mail'
require 'maildir'
require 'elasticsearch'
require 'optparse'
require_relative 'lib/utils'
require_relative 'lib/threading'
require_relative 'lib/rendering'
require_relative 'lib/storage'
require_relative 'lib/hotfixes'

$options = OpenStruct.new
$options.action = nil
$options.name = nil
$options.index_only = false
$options.no_threading = false
$options.debug = false
$options.readonly = false

op = OptionParser.new do |opts|
  opts.banner = "Usage: ag <<--index-full|--index-new|--delete|--reindex|--info> <--list listname>> <maildir/file/hash/messageid> [options]"

  opts.on('--index-full', 'Read the full past archive from the .cur Maildir') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_full
  end

  opts.on('--index-new', 'Read new messages from .new and move them to .cur') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_incremental
  end

  opts.on('--delete', 'Delete message. Needs --file, --msgid, or --hash') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_delete
  end

  opts.on('--reindex', 'Reindex message. Needs --file') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_reindex
  end

  opts.on('--list NAME', 'Name of the mailing list to work with') do |name|
    if name =~ /^[0-9a-zA-Z-]+$/
      $options.name = name
    else
      abort 'List name can only consist of letters, numbers and hyphens.'
    end
  end

  opts.on('--file', 'The argument is a file') do
    $options.argmode = :file
  end

  opts.on('--msgid', 'The argument is a Message-Id') do
    $options.argmode = :msgid
  end

  opts.on('--hash', 'The argument is a X-Archives-Hash') do
    $options.argmode = :hash
  end

  opts.on('--index-only', 'Only delete the message from the index, not from disk') do
    $options.index_only = true
  end

  opts.on('--no-threading', 'Only index, don\'t update threading') do
    $options.no_threading = true
  end

  opts.on('--debug', 'Print debug messages') do
    $options.debug = true
  end

  opts.on('--readonly', 'Do not alter the maildir in any way') do
    $options.readonly = true
  end
end
op.parse!

abort op.help unless $options.action
abort 'List name required' unless $options.name
$options.dir = ARGV[0] or abort 'Need a Maildir/File/Hash/Message-Id to work with'

$listname = ARGV[0] or abort 'List name required'

# Open maildir and set serializer
$maildir = Maildir.new(File.join($options.dir), false)
$maildir.serializer = Maildir::Serializer::Mail.new

# Connect to Elasticsearch
$es = Elasticsearch::Client.new(log: false)
$es.transport.reload_connections!

###############################################################################

def do_full
  Ag::Storage.create_index($options.name)

  $maildir.list(:cur).each do |maildir_message|
    mail = maildir_message.data

    begin
      Ag::Storage.store($options.name, mail)
    rescue => e
      $stderr.puts "Cannot save message #{mail.message_id}: #{e.message}"
      next
    end
  end

  Ag::Threading.calc($options.name) unless $options.no_threading
end

def do_incremental
  $maildir.list(:new).each do |maildir_message|
    mail = maildir_message.data

    begin
      Ag::Storage.store($options.name, mail)
      maildir_message.process unless $options.readonly
    rescue => e
      $stderr.puts "Cannot save message #{mail.message_id}: #{e.message}"
      next
    end
  end

  Ag::Threading.calc($options.name) unless $options.no_threading
end

def do_delete
  abort 'Come back later.'
end

def do_reindex
  abort 'Come back later.'
end

def do_info
  abort 'Come back later.'
end

###############################################################################

begin
  send $options.action
rescue NoMethodError
  abort 'Internal Error: Unknown action'
end