# -*- encoding : utf-8 -*-
class RailsInflectionUpdates < Card::CoreMigration
  def word ar
    return [/(?<=\W|_|^)#{ar[0]}(?=\W|_|$)/i, /(?<=\W|_|^)#{ar[1]}(?=\W|_|$)/i, ar[2]]
  end
  def word_end ar
    return [/#{ar[0]}(?=\W|_|$)/i, /#{ar[1]}(?=\W|_|$)/i, ar[2]]
  end

  def keep_the_s word
    return [ "#{word}s", word, "#{word}s" ]
  end

  def unless_name_collision card
    if (twin = Card.find_by_key(card.cardname.key) and twin.id != card.id)
      if twin.trash
        twin.destroy
        yield
      elsif !card.trash
        raise Card::Oops.new("Your deck has two different cards with names '#{card.name}' and '#{twin.name}'. After this update it's no longer possible to differentiate between those two names. Please rename or delete one of the two cards and run the update again." )
      end
    else
      yield
    end
  end

  def up
    card_names = Card.pluck(:name)
    apply_to_content = ::Set.new
    corrections =   [
             # plural,     wrong singular,  correct singular
      word([ '(\w+)lice',  '(\w+)louse',    '\1lice' ]),
      word([ '(\w+)mice',  '(\w+)mouse',    '\1mice' ]),
      word_end([ 'kine',   'cow',           'kine']),
      word( keep_the_s('analysi') ),
      word( keep_the_s('axi') )
    ]
    %w( statu crisi alia bu octopu viru analysi basi diagnosi parenthesi prognosi synopsi thesi ).each do |word|
      corrections << word_end( keep_the_s(word) )
    end


    corrections.each_with_index do |cors, i|
      plural, wrong_sing, correct_sing = cors

      card_names.reject! do |name|  # change a name only once
        if name =~ plural
          # can't use fetch, because it uses the wrong key
          # find_by_name is case-insensitve and finds the wrong cards for camel case names
          card = Card.where(name: name).select {|card| card.name == name}.first

          unless_name_collision(card) do
            apply_to_content << i
            new_key = name.to_name.key
            if card.key == new_key
              # noop.  probably means this was already migrated?
            elsif Card.find_by_key new_key
              puts "Could not update #{name}. Key '#{new_key}' already exists."
            else
              card.update_attributes! key: new_key
            end
          end
        end
      end
    end

    cards_with_css = Card.search type: ['in','html', 'css', 'scss']
    cards_with_css.each do |card|
      new_content = card.content
      content_changed = false

      apply_to_content.each do |i|
        plural, wrong_sing, correct_sing = corrections[i]
        if card.content =~ wrong_sing
          content_changed = true
          new_content = new_content.gsub(wrong_sing, correct_sing)
        end
      end
      if content_changed
        card.update_attributes! content: new_content
      end
    end
  end
end