#--
# Copyright (C) 2007 Dimitrij Denissenko
# Please read LICENSE document for more information.
#++
module SearchHelper
  # Highlights the +words+ where they is found in the +text+ by surrounding it like
  # <strong class="highlight">I'm a highlight phrase</strong>. The highlighter can be specialized by
  # passing +highlighter+ as single-quoted string with \1 where the phrase is supposed to be inserted.
  # N.B.: The +words+ is sanitized to include only letters, digits, and spaces before use.
  def highlight_search_terms(content, words, highlighter = '<span class="highlight">\1</span>')
    text, content_type = content
    if content_type == 1
      text = simple_markup(text)
    elsif content_type == 2
      text = markup(text)    
    end
    text = strip_tags(text)

    unless text.blank? || words.blank?
      CGI::unescape(words) # url un-encode the params
      results = []

      words.gsub(/[\+\-\*]/, '').split(' ').each do |w|        
        regex   = Regexp.escape(w) 
        arounds = text.split(%r{#{regex}}i)        

        text.scan(%r{#{regex}}i).each_with_index do |m, i|       
          before = arounds[i] || ''
          after = arounds[i+1] || ''
          
          results << if before.chars.size > 120
            '...' + before.last(120).gsub(%r{^[^\s]+}, '')
          elsif i == 0
            before
          end

          results << content_tag('span', m, :class => 'highlight')
                
          results << if after.chars.size > 120
            after.first(120).gsub(%r{[^\s]+$}, '') + ' ...<br/>'
          else
            after
          end
        end
      end
      text = results.blank? ? truncate(text, 120) : results.join('')
    end
    text
  end
  
  def result_link(result)
    caption = truncate(result.previewable.title, 100)
    options = result.previewable.permalink_options
    link_to(caption, options)    
  end
  
  def search_type_checkboxes
    checkboxes = []

    check_all = params[:all] == '1' || !params.has_key?(:q)
    opts = { :id => 'search_type_all' }
    label = content_tag :label, _('All'), :for => opts[:id], :class => 'inline'
    checkboxes << check_box_tag('all', 1, check_all, opts) + " #{label}"
    @searchable_classes.each do |klass|
      name = klass.table_name
      opts = { 
        :id => 'search_type_' + name,
        :onclick => "if (this.checked) $('search_type_all').checked = false;"
      }
      label = content_tag :label, _("#{name.humanize}"), :for => opts[:id], :class => 'inline'
      checkboxes << check_box_tag(name, 1, params[name] == '1', opts) + " #{label}"
    end
    row_num = (checkboxes.size.to_f / 6).ceil
    per_row = (checkboxes.size.to_f / row_num).ceil
    
    rows = []
    while rows.size < row_num
      rows << checkboxes[rows.size * per_row, per_row].join('&nbsp;&nbsp;')
    end
    rows.join('<br/>')  
  end
  
end