# The methods added to this helper will be available to all templates in the
# application.
module ApplicationHelper

  def group_view_by_menu_entry
    # not set, no menu entry
    return "" if @group_view_by.nil?

    # if view == context, the menu shows Order By Project
    menu_name = @group_view_by == 'context' ? 'project' : 'context'

    content_tag(:li) do
      link_to( 
        t("layouts.navigation.group_view_by_#{menu_name}"), 
        '#', 
        {:id => "group_view_by_link", :accesskey => "g", :title => t('layouts.navigation.group_view_by_title'), :x_current_group_by => @group_view_by} )
    end
  end

  def container_toggle(id)
    link_to(
      image_tag("blank.png", :alt => t('common.collapse_expand')),
      "#", 
      {:class => "container_toggle", :id => id} )
  end
  
  def navigation_link(name, options = {}, html_options = nil, *parameters_for_method_reference)
    link_to name, options, html_options
  end
  
  def days_from_today(date)
    (date.in_time_zone.to_date - current_user.time.to_date).to_i
  end
  
  # Check due date in comparison to today's date Flag up date appropriately with
  # a 'traffic light' colour code
  #
  def due_date(due)
    return "" if due.nil?

    days = days_from_today(due)

    colors = ['amber','amber','orange','orange','orange','orange','orange','orange']
    color = :red if days < 0
    color = :green if days > 7
    color = colors[days] if color.nil?
    
    return content_tag(:a, {:title => format_date(due)}) {
      content_tag(:span, {:class => color}) {
        case days
        when 0
          t('todos.next_actions_due_date.due_today')
        when 1
          t('todos.next_actions_due_date.due_tomorrow')
        when 2..7
          if prefs.due_style == Preference.due_styles[:due_on]
            # TODO: internationalize strftime here
            t('models.preference.due_on', :date => due.strftime("%A"))
          else
            t('models.preference.due_in', :days => days)
          end
        else
          # overdue or due very soon! sound the alarm!
          if days == -1
            t('todos.next_actions_due_date.overdue_by', :days => days * -1)
          elsif days < -1
            t('todos.next_actions_due_date.overdue_by_plural', :days => days * -1)
          else
            # more than a week away - relax
            t('models.preference.due_in', :days => days)
          end
        end
      }
    }
  end

  # Check due date in comparison to today's date Flag up date appropriately with
  # a 'traffic light' colour code Modified method for mobile screen
  #
  def due_date_mobile(due)
    if due == nil
      return ""
    end

    days = days_from_today(due)
       
    case days
    when 0
      "<span class=\"amber\">"+ format_date(due) + "</span>"
    when 1
      "<span class=\"amber\">" + format_date(due) + "</span>"
      # due 2-7 days away
    when 2..7
      "<span class=\"orange\">" + format_date(due) + "</span>"
    else
      # overdue or due very soon! sound the alarm!
      if days < 0
        "<span class=\"red\">" + format_date(due) +"</span>"
      else
        # more than a week away - relax
        "<span class=\"green\">" + format_date(due) + "</span>"
      end
    end
  end
  
  # Returns a count of next actions in the given context or project. The result
  # is count and a string descriptor, correctly pluralised if there are no
  # actions or multiple actions
  #
  def count_undone_todos_phrase(todos_parent)
    controller.count_undone_todos_phrase(todos_parent).html_safe
  end

  def count_undone_todos_phrase_text(todos_parent)
    count_undone_todos_phrase(todos_parent).gsub("&nbsp;"," ").html_safe
  end

  def count_undone_todos_and_notes_phrase(project)
    s = count_undone_todos_phrase(project)
    s += ", #{t('common.note', :count => project.note_count)}" unless project.note_count == 0
    s.html_safe
  end
  
  def link_to_context(context, descriptor = sanitize(context.name))
    link_to( descriptor, context, :title => "View context: #{context.name}" )
  end
  
  def link_to_project(project, descriptor = sanitize(project.name))
    link_to( descriptor, project, :title => "View project: #{project.name}" )
  end

  def link_to_edit_note (note, descriptor = sanitize(note.id.to_s))
    link_to(descriptor, edit_note_path(note),
      {:id => "link_edit_#{dom_id(note)}", :class => "note_edit_settings"})
  end
  
  def link_to_project_mobile(project, accesskey, descriptor = sanitize(project.name))
    link_to( descriptor, project_path(project, :format => 'm'), {:title => "View project: #{project.name}", :accesskey => accesskey} )
  end
  
  def item_link_to_context(item)
    link_to_context( item.context, prefs.verbose_action_descriptors ? "[#{item.context.name}]" : "[C]" )
  end
  
  def item_link_to_project(item)
    link_to_project( item.project, prefs.verbose_action_descriptors ? "[#{item.project.name}]" : "[P]" )
  end
  
  def render_flash
    render :partial => 'shared/flash', :object => flash
  end

  def time_span_text(date, i18n_text)
    return (date ? "#{i18n_text} #{format_date(date)}" : "").html_safe
  end
  
  def recurrence_time_span(rt)
    case rt.ends_on
    when "no_end_date"
      return time_span_text(rt.start_from, I18n.t("todos.recurrence.pattern.from"))
    when "ends_on_number_of_times"
      return I18n.t("todos.recurrence.pattern.times", :number => rt.number_of_occurences)
    when "ends_on_end_date"
      starts = time_span_text(rt.start_from, I18n.t("todos.recurrence.pattern.from"))
      ends = time_span_text(rt.end_date, I18n.t("todos.recurrence.pattern.until"))
      return starts+ends
    else
      raise Exception.new, "unknown recurrence time span selection (#{rt.ends_on})"
    end
  end

  def recurrence_pattern_as_text(recurring_todo)
    rt = recurring_todo.recurring_target_as_text
    rp = recurring_todo.recurrence_pattern
    rp = " " + rp unless rp.nil?
    rts = recurrence_time_span(recurring_todo)
    # only add space if recurrence_time_span has content
    rts = " " + rts unless rts == ""
    return rt+rp+rts
  end

  def date_format_for_date_picker()
    [
      ['%m', 'mm'],
      ['%b', 'M'],
      ['%B', 'MM'],
      ['%d', 'dd'],
      ['%a', 'D'],
      ['%A', 'DD'],
      ['%y', 'y'],
      ['%Y', 'yy']
    ].inject(current_user.prefs.date_format) { |str, translation| str.gsub(*translation) }
  end

  def sidebar_html_for_titled_list (list, title)
    return content_tag(:h3, title+" (#{list.size})")  + content_tag(:ul, sidebar_html_for_list(list))
  end

  def link_to_sidebar_item(item)
    item.is_a?(Project) ? link_to_project( item ) : link_to_context( item )
  end
  
  def sidebar_html_for_item(item)
    content_tag(:li, link_to_sidebar_item(item) + " (" + count_undone_todos_phrase(item)+")")
  end
  
  def sidebar_html_for_list(list)
    return content_tag(:li, t('sidebar.list_empty')).html_safe if list.empty?
    return list.inject("") { |html, item| html << sidebar_html_for_item(item) }.html_safe
  end

  def generate_i18n_strings
    js = "i18n_locale='#{I18n.locale}';\n"
    js << "i18n = new Array();\n"
    %w{
    shared.toggle_multi       shared.toggle_multi_title
    shared.hide_form          shared.hide_action_form_title
    shared.toggle_single      shared.toggle_single_title
    projects.hide_form        projects.hide_form_title
    projects.show_form        projects.show_form_title
    contexts.hide_form        contexts.hide_form_title
    contexts.show_form        contexts.show_form_title
    contexts.new_context_pre  contexts.new_context_post
    common.cancel             common.ok
    common.update             common.create
    common.ajaxError          todos.unresolved_dependency
    }.each do |s|
      js << "i18n['#{s}'] = '#{ t(s).gsub(/'/, "\\\\'") }';\n"
    end
    return js.html_safe
  end

  def javascript_tag_for_i18n_datepicker
    locale = I18n.locale
    # do not include en as locale since this the available by default
    if locale && locale != :en
      javascript_include_tag("i18n/jquery.ui.datepicker-#{locale}.js")
    end
  end
  
  def determine_done_path
    case controller.controller_name
    when "contexts"
      done_todos_context_path(@context)
    when "projects"
      done_todos_project_path(@project)
    when "todos"
      if source_view_is(:tag)
        done_tag_path(@tag_name)
      else
        done_todos_path
      end
    else
      done_todos_path
    end
  end
  
  def determine_all_done_path
    case controller.controller_name
    when "contexts"
      all_done_todos_context_path(@context)
    when "projects"
      all_done_todos_project_path(@project)
    when "todos"
      if source_view_is(:tag)
        all_done_tag_path(@tag_name)
      else
        all_done_todos_path
      end
    else
      all_done_todos_path
    end
  end
  
  def get_list_of_error_messages_for(model)
    if model.errors.any?
      content_tag(:div, {:id=>"errorExplanation"}) do
        content_tag(:ul) do
          model.errors.full_messages.collect { |msg| concat(content_tag(:li, msg)) }
        end
      end
    end
  end
  
end