#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2014 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.
#++

require 'forwardable'
require 'cgi'

module ApplicationHelper
  include OpenProject::TextFormatting
  include OpenProject::ObjectLinking
  include Redmine::I18n

  extend Forwardable
  def_delegators :wiki_helper, :wikitoolbar_for, :heads_for_wiki_formatter

  # Return true if user is authorized for controller/action, otherwise false
  def authorize_for(controller, action)
    User.current.allowed_to?({:controller => controller, :action => action}, @project)
  end

  # Display a link if user is authorized
  #
  # @param [String] name Anchor text (passed to link_to)
  # @param [Hash] options Hash params. This will checked by authorize_for to see if the user is authorized
  # @param [optional, Hash] html_options Options passed to link_to
  # @param [optional, Hash] parameters_for_method_reference Extra parameters for link_to
  #
  # When a block is given, skip the name parameter
  def link_to_if_authorized(*args, &block)
    name = args.shift unless block_given?
    options = args.shift || {}
    html_options = args.shift
    parameters_for_method_reference = args

    return unless authorize_for(options[:controller] || params[:controller], options[:action])

    if block_given?
      link_to(options, html_options, *parameters_for_method_reference, &block)
    else
      link_to(name, options, html_options, *parameters_for_method_reference)
    end
  end

  def required_field_name(name = '')
    safe_join [name, ' ', content_tag('span', '*', class: 'required')]
  end

  def li_unless_nil(link)
    content_tag(:li, link) if link
  end

  # Show a sorted linkified (if active) comma-joined list of users
  def list_users(users, options={})
    users.sort.collect{|u| link_to_user(u, options)}.join(", ")
  end

  #returns a class name based on the user's status
  def user_status_class(user)
    'status_' + user.status_name
  end

  def user_status_i18n(user)
    l(('status_' + user.status_name).to_sym)
  end

  def toggle_link(name, id, options = {}, html_options = {})
    onclick = "jQuery('##{id}').toggle(); "
    onclick << (options[:focus] ? "jQuery('##{options[:focus]}').focus(); " : 'this.blur(); ')
    onclick << 'return false;'
    link_to(name, '#', { onclick: onclick }.merge(html_options))
  end

  def delete_link(url, options={})
    options = {
      :method => :delete,
      :data => {:confirm => l(:text_are_you_sure)},
      :class => 'icon icon-delete'
    }.merge(options)

    link_to l(:button_delete), url, options
  end

  def image_to_function(name, function, html_options = {})
    html_options.symbolize_keys!
    tag(:input, html_options.merge({
        :type => "image", :src => image_path(name),
        :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function};"
        }))
  end

  def prompt_to_remote(name, text, param, url, html_options = {})
    html_options[:onclick] = "promptToRemote('#{text}', '#{param}', '#{url_for(url)}'); return false;"
    link_to name, {}, html_options
  end

  def format_activity_title(text)
    h(truncate_single_line(text, :length => 100))
  end

  def format_activity_day(date)
    date == Date.today ? l(:label_today).titleize : format_date(date)
  end

  def format_activity_description(text)
    h(truncate(text.to_s, :length => 120).gsub(%r{[\r\n]*<(pre|code)>.*$}m, '...')).gsub(/[\r\n]+/, "<br />").html_safe
  end

  def format_version_name(version)
    h(version.to_s_for_project(@project))
  end

  def due_date_distance_in_words(date)
    if date
      l((date < Date.today ? :label_roadmap_overdue : :label_roadmap_due_in), distance_of_date_in_words(Date.today, date))
    end
  end

  def render_page_hierarchy(pages, node=nil, options={})
    return '' unless pages[node]

    content_tag :ul, class: 'pages-hierarchy' do
      pages[node].collect do |page|
        content_tag :li do
          concat link_to(page.pretty_title, project_wiki_path(page.project, page),
            title: (options[:timestamp] && page.updated_on ? l(:label_updated_time, distance_of_time_in_words(Time.now, page.updated_on)) : nil))
          concat render_page_hierarchy(pages, page.id, options) if pages[page.id]
        end
      end.join.html_safe
    end
  end

  def error_messages_for(*params)
    objects, options = extract_objects_from_params(params)

    error_messages = objects.map{ |o| o.errors.full_messages }.flatten

    unless error_messages.empty?
      render partial: 'common/validation_error', locals: { error_messages: error_messages,
                                                           object_name: options[:object_name].to_s.gsub('_', '') }
    end
  end

  # Taken from Dynamic Form
  #
  # lib/action_view/helpers/dynamic_form.rb:187-198
  def extract_objects_from_params(params)
    options = params.extract_options!.symbolize_keys

    objects = Array.wrap(options.delete(:object) || params).map do |object|
      object = instance_variable_get("@#{object}") unless object.respond_to?(:to_model)
      object = convert_to_model(object)

      if object.class.respond_to?(:model_name)
        options[:object_name] ||= object.class.model_name.human.downcase
      end

      object
    end

    [objects.compact, options]
  end

  # Renders flash messages
  def render_flash_messages
    flash.map { |k,v| render_flash_message(k, v) }.join.html_safe
  end

  def join_flash_messages(messages)
    if messages.respond_to?(:join)
      messages.join('<br />').html_safe
    else
      messages
    end
  end

  def render_flash_message(type, message, html_options = {})
    css_classes = ["flash #{type} icon icon-#{type}", html_options.delete(:class)].join(' ')
    html_options = { :class => css_classes, role: "alert" }.merge(html_options)
    if User.current.impaired?
      content_tag('div', content_tag('a', join_flash_messages(message), :href => 'javascript:;'), html_options)
    else
      content_tag('div', join_flash_messages(message), html_options)
    end
  end

  # Renders tabs and their content
  def render_tabs(tabs)
    if tabs.any?
      render :partial => 'common/tabs', :locals => {:tabs => tabs}
    else
      content_tag 'p', l(:label_no_data), :class => "nodata"
    end
  end

  def project_tree_options_for_select(projects, options = {}, &block)
    Project.project_level_list(projects).map do |element|

      tag_options = {
        :value => h(element[:project].id),
        :title => h(element[:project].name),
      }

      if options[:selected] == element[:project] ||
         (options[:selected].respond_to?(:include?) &&
          options[:selected].include?(element[:project]))

        tag_options[:selected] = 'selected'
      end

      level_prefix = ''
      level_prefix = ('&nbsp;' * 3 * element[:level] + '&#187; ').html_safe if element[:level] > 0

      tag_options.merge!(yield(element[:project])) if block_given?

      content_tag('option', level_prefix + h(element[:project].name), tag_options)
    end.join('').html_safe
  end

  # Yields the given block for each project with its level in the tree
  #
  # Wrapper for Project#project_tree
  def project_tree(projects, &block)
    Project.project_tree(projects, &block)
  end

  def project_nested_ul(projects, &block)
    s = ''
    if projects.any?
      ancestors = []
      Project.project_tree(projects) do |project, level|
        if (ancestors.empty? || project.is_descendant_of?(ancestors.last))
          s << "<ul>\n"
        else
          ancestors.pop
          s << "</li>"
          while (ancestors.any? && !project.is_descendant_of?(ancestors.last))
            ancestors.pop
            s << "</ul></li>\n"
          end
        end
        s << "<li>"
        s << yield(project).to_s
        ancestors << project
      end
      s << ("</li></ul>\n" * ancestors.size)
    end
    s.html_safe
  end

  def principals_check_box_tags(name, principals)
    labeled_check_box_tags(name, principals,
                                 { :title => :user_status_i18n,
                                   :class => :user_status_class })
  end

  def labeled_check_box_tags(name, collection, options = {})
    collection.sort.collect do |object|
      id = name.gsub(/[\[\]]+/,"_") + object.id.to_s

      object_options = options.inject({}) do |h, (k, v)|
        h[k] = v.is_a?(Symbol) ?
                 send(v, object) :
                 v

        h
      end

      content_tag :div do
        check_box_tag(name, object.id, false, :id => id) +
        label_tag(id, object, object_options)
      end
    end.join.html_safe
  end

  def html_hours(text)
    text.gsub(%r{(\d+)\.(\d+)}, '<span class="hours hours-int">\1</span><span class="hours hours-dec">.\2</span>').html_safe
  end

  def authoring(created, author, options={})
    l(options[:label] || :label_added_time_by, :author => link_to_user(author), :age => time_tag(created)).html_safe
  end

  def time_tag(time)
    text = distance_of_time_in_words(Time.now, time)
    if @project and @project.module_enabled?("activity")
      link_to(text, {:controller => '/activities', :action => 'index', :project_id => @project, :from => time.to_date}, :title => format_time(time))
    else
      content_tag('label', text, :title => format_time(time), :class => "timestamp")
    end
  end

  def syntax_highlight(name, content)
    Redmine::SyntaxHighlighting.highlight_by_filename(content, name)
  end

  def to_path_param(path)
    path.to_s
  end


  def reorder_links(name, url, options = {})
    method = options[:method] || :post

    content_tag(:span,
      link_to(image_tag('2uparrow.png',   :alt => l(:label_sort_highest)), url.merge({"#{name}[move_to]" => 'highest'}), :method => method, :title => l(:label_sort_highest)) +
      link_to(image_tag('1uparrow.png',   :alt => l(:label_sort_higher)),  url.merge({"#{name}[move_to]" => 'higher'}),  :method => method, :title => l(:label_sort_higher)) +
      link_to(image_tag('1downarrow.png', :alt => l(:label_sort_lower)),   url.merge({"#{name}[move_to]" => 'lower'}),   :method => method, :title => l(:label_sort_lower)) +
      link_to(image_tag('2downarrow.png', :alt => l(:label_sort_lowest)),  url.merge({"#{name}[move_to]" => 'lowest'}),  :method => method, :title => l(:label_sort_lowest)),
      :class => "reorder-icons"
    )
  end

  def other_formats_links(&block)
    formats = capture(Redmine::Views::OtherFormatsBuilder.new(self), &block)
    unless formats.nil? || formats.strip.empty?
      content_tag 'p', :class => 'other-formats' do
        (l(:label_export_to) + formats).html_safe
      end
    end
  end

  # this method seems to not be used any more
  def page_header_title
    if @page_header_title.present?
      h(@page_header_title)
    elsif @project.nil? || @project.new_record?
      h(Setting.app_title)
    else
      b = []
      ancestors = (@project.root? ? [] : @project.ancestors.visible)
      if ancestors.any?
        root = ancestors.shift
        b << link_to_project(root, {:jump => current_menu_item}, :class => 'root')
        if ancestors.size > 2
          b << '&#8230;'
          ancestors = ancestors[-2, 2]
        end
        b += ancestors.collect {|p| link_to_project(p, {:jump => current_menu_item}, :class => 'ancestor') }
      end
      b << h(@project)
      b.join(' &#187; ')
    end
  end

  def html_title(*args)
    title = []

    if args.empty?
      title << h(@project.name) if @project
      title += @html_title if @html_title
      title << h(Setting.app_title)
    else
      @html_title ||= []
      @html_title += args
      title += @html_title
    end

    title.select {|t| !t.blank? }.join(' - ').html_safe
  end

  # Returns the theme, controller name, and action as css classes for the
  # HTML body.
  def body_css_classes
    css = ['theme-' + current_theme.identifier.to_s]
    if params[:controller] && params[:action]
      css << 'controller-' + params[:controller]
      css << 'action-' + params[:action]
    end
    css.join(' ')
  end

  def accesskey(s)
    OpenProject::AccessKeys.key_for s
  end

  # Same as Rails' simple_format helper without using paragraphs
  def simple_format_without_paragraph(text)
    text.to_s.
      gsub(/\r\n?/, "\n").                    # \r\n and \r -> \n
      gsub(/\n\n+/, "<br /><br />").          # 2+ newline  -> 2 br
      gsub(/([^\n]\n)(?=[^\n])/, '\1<br />').  # 1 newline   -> br
      html_safe
  end

  def lang_options_for_select(blank=true)
    auto = if (blank && (valid_languages - all_languages) == (all_languages - valid_languages))
            [["(auto)", ""]]
           else
            []
          end
    auto + valid_languages.collect{|lang| [ ll(lang.to_s, :general_lang_name), lang.to_s]}.sort{|x,y| x.last <=> y.last }
  end

  def all_lang_options_for_select(blank=true)
    (blank ? [["(auto)", ""]] : []) +
      all_languages.collect{|lang| [ ll(lang.to_s, :general_lang_name), lang.to_s]}.sort{|x,y| x.last <=> y.last }
  end

  def labelled_tabular_form_for(record, options = {}, &block)
    options.reverse_merge!(:builder => TabularFormBuilder, :lang => current_language, :html => {})
    options[:html][:class] = 'tabular' unless options[:html].has_key?(:class)
    form_for(record, options, &block)
  end

  def back_url_hidden_field_tag
    back_url = params[:back_url] || request.env['HTTP_REFERER']
    back_url = CGI.unescape(back_url.to_s)
    hidden_field_tag('back_url', CGI.escape(back_url)) unless back_url.blank?
  end

  def back_url_to_current_page_hidden_field_tag
    back_url = params[:back_url]
    if back_url.present?
      back_url = back_url.to_s
    elsif request.get? and !params.blank?
      back_url = url_for(params)
    end
    hidden_field_tag('back_url', back_url) unless back_url.blank?
  end

  def check_all_links(form_name)
    link_to_function(l(:button_check_all), "checkAll('#{form_name}', true)") +
    " | " +
    link_to_function(l(:button_uncheck_all), "checkAll('#{form_name}', false)")
  end

  # Generates the HTML for a progress bar
  # Params:
  # * pcts:
  #   * a number indicating the percentage done
  #   * or an array of two numbers -> [percentage_closed, percentage_done]
  #     where percentage_closed <= percentage_done
  #     and   percentage_close + percentage_done <= 100
  # * options:
  #   A hash containing the following keys:
  #   * width: (default '100px') the css-width for the progress bar
  #   * legend: (default: '') the text displayed alond with the progress bar
  def progress_bar(pcts, options={})
    pcts = Array(pcts).map(&:round)
    closed = pcts[0]
    done   = (pcts[1] || closed) - closed
    width = options[:width] || '100px;'
    legend = options[:legend] || ''

    content_tag :span do
      content_tag :span, class: 'progress-bar', style: "width: #{width}" do
        content_tag(:span, '', class: 'inner-progress closed', style: "width: #{closed}%") +
        content_tag(:span, '', class: 'inner-progress done',   style: "width: #{done}%")
      end.<<(content_tag :span, "#{legend}% #{l(:total_progress)}", class: 'progress-bar-legend')
    end
  end

  def checked_image(checked=true)
    if checked
      icon_wrapper('icon-context icon-yes',l(:label_checked))
    end
  end

  def calendar_for(field_id)
    include_calendar_headers_tags
    javascript_tag("jQuery('##{field_id}').datepicker();")
  end

  def include_calendar_headers_tags
    unless @calendar_headers_tags_included
      @calendar_headers_tags_included = true
      content_for :header_tags do
        start_of_week = case Setting.start_of_week.to_i
        when 1
          '1' # Monday
        when 7
          '0' # Sunday
        when 6
          '6' # Saturday
        else
          '' # use language
        end
        js = "var CS = { lang: '#{current_language.to_s.downcase}', firstWeekDay: '#{start_of_week}' };"
        javascript_tag(js)
      end
    end
  end

  # Returns the javascript tags that are included in the html layout head
  def user_specific_javascript_includes
    tags = ''
    tags += javascript_tag(%Q{
      window.openProject = new OpenProject({
        urlRoot : '#{OpenProject::Configuration.rails_relative_url_root}',
        loginUrl: '#{url_for :controller => "/account", :action => "login"}'
      });
      I18n.defaultLocale = "#{I18n.default_locale}";
      I18n.locale = "#{I18n.locale}";
    })
    unless User.current.pref.warn_on_leaving_unsaved == '0'
      tags += javascript_tag(%Q{
        jQuery(document).ready(function(){
          warnLeavingUnsaved('#{escape_javascript(l(:text_warn_on_leaving_unsaved))}');
          jQuery(document).ajaxComplete(function(){
            warnLeavingUnsaved('#{escape_javascript(l(:text_warn_on_leaving_unsaved))}')
          });
        });
      })
    end

    if User.current.impaired? and accessibility_js_enabled?
      tags += javascript_include_tag("accessibility.js")
    end

    tags.html_safe
  end

  # Add a HTML meta tag to control robots (web spiders)
  #
  # @param [optional, String] content the content of the ROBOTS tag.
  #   defaults to no index, follow, and no archive
  def robot_exclusion_tag(content="NOINDEX,FOLLOW,NOARCHIVE")
    "<meta name='ROBOTS' content='#{h(content)}' />".html_safe
  end

  # Returns true if arg is expected in the API response
  def include_in_api_response?(arg)
    unless @included_in_api_response
      param = params[:include]
      @included_in_api_response = param.is_a?(Array) ? param.collect(&:to_s) : param.to_s.split(',')
      @included_in_api_response.collect!(&:strip)
    end
    @included_in_api_response.include?(arg.to_s)
  end

  # Returns options or nil if nometa param or X-OpenProject-Nometa header
  # was set in the request
  def api_meta(options)
    if params[:nometa].present? || request.headers['X-OpenProject-Nometa']
      # compatibility mode for activeresource clients that raise
      # an error when deserializing an array with attributes
      nil
    else
      options
    end
  end

  def disable_accessibility_css!
    @accessibility_css_disabled = true
  end

  def accessibility_css_enabled?
    !@accessibility_css_disabled
  end

  def disable_accessibility_js!
    @accessibility_js_disabled = true
  end

  def accessibility_js_enabled?
    !@accessibility_js_disabled
  end

  #
  # Returns the footer text displayed in the layout file.
  #
  def footer_content
    elements = []
    elements << I18n.t(:text_powered_by, :link => link_to(OpenProject::Info.app_name,
                                                          OpenProject::Info.url))
    unless OpenProject::Footer.content.nil?
      OpenProject::Footer.content.each do |name, value|
        content = value.respond_to?(:call) ? value.call : value
        if content
          elements << content_tag(:span, content, :class => "footer_#{name}")
        end
      end
    end
    elements << Setting.additional_footer_content if Setting.additional_footer_content.present?
    elements.join(", ").html_safe
  end

  private

  def wiki_helper
    helper = Redmine::WikiFormatting.helper_for(Setting.text_formatting)
    extend helper
    return self
  end

  def link_to_content_update(text, url_params = {}, html_options = {})
    link_to(text, url_params, html_options)
  end

  def password_complexity_requirements
    rules = OpenProject::Passwords::Evaluator.rules_description
    # use 0..0, so this doesn't fail if rules is an empty string
    rules[0] = rules[0..0].upcase

    s = raw "<em>" + OpenProject::Passwords::Evaluator.min_length_description + "</em>"
    s += raw "<br /><em>" + rules + "</em>" unless rules.empty?
    s
  end

  def icon_wrapper(icon_class, label)
    content =  content_tag(:span, '', :class => icon_class)
    content += content_tag(:span, label, :class => 'hidden-for-sighted')
  end

end