#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2013 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

module SearchHelper
  def highlight_tokens(text, tokens)
    return text unless text && tokens && !tokens.empty?
    re_tokens = tokens.collect {|t| Regexp.escape(t)}
    regexp = Regexp.new "(#{re_tokens.join('|')})", Regexp::IGNORECASE
    result = ''
    text.split(regexp).each_with_index do |words, i|
      if result.length > 1200
        # maximum length of the preview reached
        result << '...'
        break
      end
      words = words.mb_chars
      if i.even?
        result << h(words.length > 100 ? "#{words.slice(0..44)} ... #{words.slice(-45..-1)}" : words)
      else
        t = (tokens.index(words.downcase) || 0) % 4
        result << content_tag('span', h(words), :class => "highlight token-#{t}")
      end
    end
    result.html_safe
  end

  def type_label(t)
    l("label_#{t.singularize}_plural", :default => t.to_s.humanize)
  end

  def project_select_tag
    options = [[l(:label_project_all), 'all']]
    options << [l(:label_my_projects), 'my_projects'] unless User.current.memberships.empty?
    options << [l(:label_and_its_subprojects, @project.name), 'subprojects'] unless @project.nil? || @project.descendants.active.empty?
    options << [@project.name, 'current_project'] unless @project.nil?
    label_tag("scope", l(:description_project_scope), :class => "hidden-for-sighted") +
    select_tag('scope', options_for_select(options, current_scope)) if options.size > 1
  end

  def render_results_by_type(results_by_type)
    links = []
    # Sorts types by results count
    results_by_type.keys.sort {|a, b| results_by_type[b] <=> results_by_type[a]}.each do |t|
      c = results_by_type[t]
      next if c == 0
      text = "#{type_label(t)} (#{c})"
      target = {
        :controller => 'search',
        :project_id => (@project.identifier if @project),
        :action => 'index',
        :q => params[:q],
        :titles_only => params[:title_only],
        :all_words => params[:all_words],
        :scope => current_scope,
        t => 1
      }
      links << link_to(h(text), target)
    end
    ('<ul>' + links.map {|link| content_tag('li', link)}.join(' ') + '</ul>').html_safe unless links.empty?
  end

  def current_scope
    params[:scope] || ('current_project' unless @project.nil?)
  end

  def link_to_previous_search_page(pagination_previous_date)
    link_to_content_update(l(:label_previous),
                           params.merge(:previous => 1, :offset => pagination_previous_date.strftime("%Y%m%d%H%M%S")), :class => 'navigate-left')
  end

  def link_to_next_search_page(pagination_next_date)
    link_to_content_update(l(:label_next),
                           params.merge(:previous => nil, :offset => pagination_next_date.strftime("%Y%m%d%H%M%S")), :class => 'navigate-right')
  end
end