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

$VERBOSE=nil

require 'bundler/setup'
require 'mail'
require 'maildir'
require 'elasticsearch'
require 'optparse'
require 'parallel'
require 'ruby-progressbar'
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
$options.jobs = false
$options.progress = true
$options.need_argument = true
$options.argmode = nil

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

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

    $options.action = :do_full
    $options.argmode = :dir
  end

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

    $options.action = :do_incremental
    $options.argmode = :dir
  end

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

    $options.action = :do_delete_msg
  end
  
  opts.on('--create-index', 'Create index but do not populate. Needs --list') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_create_index
    $options.need_argument = false
  end
  
  opts.on('--rethread', 'Rethread messages. Needs --list') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_rethread
    $options.need_argument = false
  end

  opts.on('--delete-index', 'Delete index. Needs --list') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_delete_index
    $options.need_argument = false
  end

  opts.on('--info', 'Display message details. Needs --list and one of --file, --msgid, or --hash') do
    abort 'Can only select one action' if $options.action != nil

    $options.action = :do_info
  end

  opts.on('--reindex', 'Reindex message. Needs --list and --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

  opts.on('--jobs JOBS', 'Number of parallel jobs to run (defaults to 75% of core count)') do |jobs|
    $options.jobs = jobs.to_i
  end

  opts.on('--progress', 'Display the progress bar') do
    $options.progress = true
  end
  opts.on('--no-progress', 'Do not display the progress bar') do
    $options.progress = false
  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' if $options.need_argument

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

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

Ag::Utils.proc_count = $options.jobs

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

def do_full
  abort "Wrong argument type: #{$options.argmode.to_s}" unless $options.argmode == :dir
  begin
    Ag::Storage.delete_index($options.name)
  rescue Elasticsearch::Transport::Transport::Errors::NotFound => e
    $stderr.puts "Index did not exist yet. Creating." if $options.debug
  end
  Ag::Storage.create_index($options.name)

  messages = $maildir.list(:cur)

  opts = {
    :in_processes => Ag::Utils.proc_count,
  }
  opts[:progress] = "Importing #{$options.name}" if $options.progress
  Parallel.each(messages, opts) do |maildir_message|
    mail = maildir_message.data

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

  do_rethread
end

def do_incremental
  abort "Wrong argument type: #{$options.argmode.to_s}" unless $options.argmode == :dir
  messages = $maildir.list(:new)

  opts = {
    :in_processes => Ag::Utils.proc_count,
  }
  opts[:progress] = "Importing #{$options.name}" if $options.progress
  Parallel.each(messages, opts) do |maildir_message|
    mail = maildir_message.data

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

  do_rethread
end

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

def do_delete_msg
  id = Ag::Utils.resolve_id

  begin
    Ag::Storage.delete($options.name, id)
  rescue => e
    $stderr.puts "Cannot delete message: #{e}"
  end
end

def do_delete_index
  begin
    Ag::Storage.delete_index($options.name)
  rescue Elasticsearch::Transport::Transport::Errors::NotFound => e
    $stderr.puts "Index does not exist: #{e}"
  rescue => e
    $stderr.puts "Cannot delete index: #{e}"
  end
end

def do_create_index
  Ag::Storage.create($options.name)
end

def do_reindex
  # http://babinho.net/2014/07/refresh-your-elasticsearch-index-with-zero-downtime/
  abort 'Come back later.'
end

def do_info
  id = Ag::Utils.resolve_id

  begin
    message = Ag::Storage.get($options.name, id)

    raise 'No such message' unless message

    require 'pp'
    str = "Message #{id}"
    $stderr.puts str
    $stderr.puts '-' * str.length

    pp message['_source']
  rescue => e
    $stderr.puts "Cannot display message: #{e}"
  end
end

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

if self.private_methods.include? $options.action
  send $options.action
else
  abort "Internal Error: Unknown action: #{$options.action}"
end
# vim: ts=2 sts=2 et ft=ruby: