require 'rinku'
require 'erb'

GMANE_FIND = 'http://news.gmane.org/find-root.php?message_id='
MARC_FIND = 'https://marc.info/?i='

helpers do
  def list_check
    unless [$config['active_lists'], $config['frozen_lists']].flatten.include?(params[:list])
      status 404
      body "List not found"
      return false
    end

    true
  end

  def monthint_to_link(monthint)
    date = DateTime.parse("%s-%s-01" % [monthint[0..3], monthint[4..5]])

    "<a href=\"threads/%s/\">%s</a>" % [date.strftime('%Y-%m'), date.strftime('%Y %B')]
  end

  def date_format(date)
    DateTime.iso8601(date).strftime('%a, %d %b %Y %T')
  end

  def to_monthint(year, month)
    ("%i%02i" % [year.to_i, month.to_i]).to_i
  end

  def to_month(year, month)
    date = DateTime.parse("%s-%s-01" % [year, month])
    date.strftime('%B %Y')
  end

  def h(text)
    Rack::Utils.escape_html(text)
  end

  def u(text)
    ERB::Util::url_encode(text)
  end

  def strip_email_domain(str)
    str.split(/,\s*/).map do |email|
      email.gsub(/@(.*?)(>|$)/) do |s|
        if $1 == 'gentoo.org'
          "@g.o#{$2}"
        elsif $1 == 'lists.gentoo.org'
          "@l.g.o#{$2}"
        else
          "@#{'×' * $1.length}#{$2}"
        end
      end
    end.join(', ')
  end

  def strip_email(str)
    str.split(/,\s*/).map do |email|
      email.gsub(/([a-zA-Z0-9._%+-]+)@([a-zA-Z0-9.-]+)\.([a-zA-Z]{2,10})/) do |s|
        if $2 == 'gentoo' and $3 == 'org'
          "#{$1}@g.o"
        elsif $2 == 'lists.gentoo' and $3 == 'org'
          "#{$1}@l.g.o"
        else
          "#{$1}@#{'×' * $2.length}.#{$3}"
        end
      end
    end.join(', ')
  end

  def linkize(str)
    Rinku.auto_link(str, :urls, 'rel="nofollow"')
  end

  def msgid_to_gmane(msgid)
    GMANE_FIND + ERB::Util::url_encode(msgid)
  end

  def msgid_to_marc(msgid)
    # We have to transform the msg-id first
    # CAK86ViRgefgrb0qUyjQdYa+6C5BTiNvn8UKZwQsMvcJmY-L0mg@mail.gmail.com
    # CAK86ViRgefgrb0qUyjQdYa+6C5BTiNvn8UKZwQsMvcJmY-L0mg () mail ! gmail ! com
    # http://marc.info/?i=CAK86ViRgefgrb0qUyjQdYa+6C5BTiNvn8UKZwQsMvcJmY-L0mg%20()%20mail%20!%20gmail%20!%20com
    # pan.2009.08.28.00.00.38@cox.net
    # http://marc.info/?i=pan.2009.08.28.00.00.38%20()%20cox%20!%20net
    local, host = msgid.split('@', 2)
    new_msgid = local + ' () ' + host.gsub('.',' ! ')
    MARC_FIND + ERB::Util::url_encode(new_msgid)
  end
end