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# redMine - project management software

# Copyright (C) 2006-2007  Jean-Philippe Lang

#

# 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.

require 'tree' # gem install rubytree

# Monkey patch the TreeNode to add on a few more methods :nodoc:

module TreeNodePatch

  def self.included(base)

    base.class_eval do

      attr_reader :last_items_count

      alias :old_initilize :initialize

      def initialize(name, content = nil)

        old_initilize(name, content)

        @last_items_count = 0

        extend(InstanceMethods)

      end

    end

  end

  module InstanceMethods

    # Adds the specified child node to the receiver node.  The child node's

    # parent is set to be the receiver.  The child is added as the first child in

    # the current list of children for the receiver node.

    def prepend(child)

      raise "Child already added" if @childrenHash.has_key?(child.name)

      @childrenHash[child.name]  = child

      @children = [child] + @children

      child.parent = self

      return child

    end

    # Adds the specified child node to the receiver node.  The child node's

    # parent is set to be the receiver.  The child is added at the position

    # into the current list of children for the receiver node.

    def add_at(child, position)

      raise "Child already added" if @childrenHash.has_key?(child.name)

      @childrenHash[child.name]  = child

      @children = @children.insert(position, child)

      child.parent = self

      return child

    end

    def add_last(child)

      raise "Child already added" if @childrenHash.has_key?(child.name)

      @childrenHash[child.name]  = child

      @children <<  child

      @last_items_count += 1

      child.parent = self

      return child

    end

    # Adds the specified child node to the receiver node.  The child node's

    # parent is set to be the receiver.  The child is added as the last child in

    # the current list of children for the receiver node.

    def add(child)

      raise "Child already added" if @childrenHash.has_key?(child.name)

      @childrenHash[child.name]  = child

      position = @children.size - @last_items_count

      @children.insert(position, child)

      child.parent = self

      return child

    end

    # Wrapp remove! making sure to decrement the last_items counter if

    # the removed child was a last item

    def remove!(child)

      @last_items_count -= +1 if child && child.last

      super

    end

    # Will return the position (zero-based) of the current child in

    # it's parent

    def position

      self.parent.children.index(self)

    end

  end

end

Tree::TreeNode.send(:include, TreeNodePatch)

module Redmine

  module MenuManager

    class MenuError < StandardError #:nodoc:

    end

    module MenuController

      def self.included(base)

        base.extend(ClassMethods)

      end

      module ClassMethods

        @@menu_items = Hash.new {|hash, key| hash[key] = {:default => key, :actions => {}}}

        mattr_accessor :menu_items

        # Set the menu item name for a controller or specific actions

        # Examples:

        #   * menu_item :tickets # => sets the menu name to :tickets for the whole controller

        #   * menu_item :tickets, :only => :list # => sets the menu name to :tickets for the 'list' action only

        #   * menu_item :tickets, :only => [:list, :show] # => sets the menu name to :tickets for 2 actions only

        #   

        # The default menu item name for a controller is controller_name by default

        # Eg. the default menu item name for ProjectsController is :projects

        def menu_item(id, options = {})

          if actions = options[:only]

            actions = [] << actions unless actions.is_a?(Array)

            actions.each {|a| menu_items[controller_name.to_sym][:actions][a.to_sym] = id}

          else

            menu_items[controller_name.to_sym][:default] = id

          end

        end

      end

      def menu_items

        self.class.menu_items

      end

      # Returns the menu item name according to the current action

      def current_menu_item

        @current_menu_item ||= menu_items[controller_name.to_sym][:actions][action_name.to_sym] ||

                                 menu_items[controller_name.to_sym][:default]

      end

      # Redirects user to the menu item of the given project

      # Returns false if user is not authorized

      def redirect_to_project_menu_item(project, name)

        item = Redmine::MenuManager.items(:project_menu).detect {|i| i.name.to_s == name.to_s}

        if item && User.current.allowed_to?(item.url, project) && (item.condition.nil? || item.condition.call(project))

          redirect_to({item.param => project}.merge(item.url))

          return true

        end

        false

      end

    end

    module MenuHelper

      # Returns the current menu item name

      def current_menu_item

        @controller.current_menu_item

      end

      # Renders the application main menu

      def render_main_menu(project)

        render_menu((project && !project.new_record?) ? :project_menu : :application_menu, project)

      end

      def display_main_menu?(project)

        menu_name = project && !project.new_record? ? :project_menu : :application_menu

        Redmine::MenuManager.items(menu_name).size > 1 # 1 element is the root

      end

      def render_menu(menu, project=nil)

        links = []

        menu_items_for(menu, project) do |node|

          links << render_menu_node(node, project)

        end

        links.empty? ? nil : content_tag('ul', links.join("\n"))

      end

      def render_menu_node(node, project=nil)

        if node.hasChildren? || !node.child_menus.nil?

          return render_menu_node_with_children(node, project)

        else

          caption, url, selected = extract_node_details(node, project)

          return content_tag('li',

                               render_single_menu_node(node, caption, url, selected))

        end

      end

      def render_menu_node_with_children(node, project=nil)

        caption, url, selected = extract_node_details(node, project)

        html = [].tap do |html|

          html << '<li>'

          # Parent

          html << render_single_menu_node(node, caption, url, selected)

          # Standard children

          standard_children_list = "".tap do |child_html|

            node.children.each do |child|

              child_html << render_menu_node(child, project)

            end

          end

          html << content_tag(:ul, standard_children_list, :class => 'menu-children') unless standard_children_list.empty?

          # Unattached children

          unattached_children_list = render_unattached_children_menu(node, project)

          html << content_tag(:ul, unattached_children_list, :class => 'menu-children unattached') unless unattached_children_list.blank?

          html << '</li>'

        end

        return html.join("\n")

      end

      # Returns a list of unattached children menu items

      def render_unattached_children_menu(node, project)

        return nil unless node.child_menus

        "".tap do |child_html|

          unattached_children = node.child_menus.call(project)

          # Tree nodes support #each so we need to do object detection

          if unattached_children.is_a? Array

            unattached_children.each do |child|

              child_html << content_tag(:li, render_unattached_menu_item(child, project)) 

            end

          else

            raise MenuError, ":child_menus must be an array of MenuItems"

          end

        end

      end

      def render_single_menu_node(item, caption, url, selected)

        link_to(h(caption), url, item.html_options(:selected => selected))

      end

      def render_unattached_menu_item(menu_item, project)

        raise MenuError, ":child_menus must be an array of MenuItems" unless menu_item.is_a? MenuItem

        if User.current.allowed_to?(menu_item.url, project)

          link_to(h(menu_item.caption),

                  menu_item.url,

                  menu_item.html_options)

        end

      end

      def menu_items_for(menu, project=nil)

        items = []

        Redmine::MenuManager.items(menu).root.children.each do |node|

          if allowed_node?(node, User.current, project)

            if block_given?

              yield node

            else

              items << node  # TODO: not used?

            end

          end

        end

        return block_given? ? nil : items

      end

      def extract_node_details(node, project=nil)

        item = node

        url = case item.url

        when Hash

          project.nil? ? item.url : {item.param => project}.merge(item.url)

        when Symbol

          send(item.url)

        else

          item.url

        end

        caption = item.caption(project)

        return [caption, url, (current_menu_item == item.name)]

      end

      # Checks if a user is allowed to access the menu item by:

      #

      # * Checking the conditions of the item

      # * Checking the url target (project only)

      def allowed_node?(node, user, project)

        if node.condition && !node.condition.call(project)

          # Condition that doesn't pass

          return false

        end

        if project

          return user && user.allowed_to?(node.url, project)

        else

          # outside a project, all menu items allowed

          return true

        end

      end

    end

    class << self

      def map(menu_name)

        @items ||= {}

        mapper = Mapper.new(menu_name.to_sym, @items)

        if block_given?

          yield mapper

        else

          mapper

        end

      end

      def items(menu_name)

        @items[menu_name.to_sym] || Tree::TreeNode.new(:root, {})

      end

    end

    class Mapper

      def initialize(menu, items)

        items[menu] ||= Tree::TreeNode.new(:root, {})

        @menu = menu

        @menu_items = items[menu]

      end

      @@last_items_count = Hash.new {|h,k| h[k] = 0}

      # Adds an item at the end of the menu. Available options:

      # * param: the parameter name that is used for the project id (default is :id)

      # * if: a Proc that is called before rendering the item, the item is displayed only if it returns true

      # * caption that can be:

      #   * a localized string Symbol

      #   * a String

      #   * a Proc that can take the project as argument

      # * before, after: specify where the menu item should be inserted (eg. :after => :activity)

      # * parent: menu item will be added as a child of another named menu (eg. :parent => :issues)

      # * children: a Proc that is called before rendering the item. The Proc should return an array of MenuItems, which will be added as children to this item.

      #   eg. :children => Proc.new {|project| [Redmine::MenuManager::MenuItem.new(...)] }

      # * last: menu item will stay at the end (eg. :last => true)

      # * html_options: a hash of html options that are passed to link_to

      def push(name, url, options={})

        options = options.dup

        if options[:parent]

          subtree = self.find(options[:parent])

          if subtree

            target_root = subtree

          else

            target_root = @menu_items.root

          end

        else

          target_root = @menu_items.root

        end

        # menu item position

        if first = options.delete(:first)

          target_root.prepend(MenuItem.new(name, url, options))

        elsif before = options.delete(:before)

          if exists?(before)

            target_root.add_at(MenuItem.new(name, url, options), position_of(before))

          else

            target_root.add(MenuItem.new(name, url, options))

          end

        elsif after = options.delete(:after)

          if exists?(after)

            target_root.add_at(MenuItem.new(name, url, options), position_of(after) + 1)

          else

            target_root.add(MenuItem.new(name, url, options))

          end

        elsif options[:last] # don't delete, needs to be stored

          target_root.add_last(MenuItem.new(name, url, options))

        else

          target_root.add(MenuItem.new(name, url, options))

        end

      end

      # Removes a menu item

      def delete(name)

        if found = self.find(name)

          @menu_items.remove!(found)

        end

      end

      # Checks if a menu item exists

      def exists?(name)

        @menu_items.any? {|node| node.name == name}

      end

      def find(name)

        @menu_items.find {|node| node.name == name}

      end

      def position_of(name)

        @menu_items.each do |node|

          if node.name == name

            return node.position

          end

        end

      end

    end

    class MenuItem < Tree::TreeNode

      include Redmine::I18n

      attr_reader :name, :url, :param, :condition, :parent, :child_menus, :last

      def initialize(name, url, options)

        raise ArgumentError, "Invalid option :if for menu item '#{name}'" if options[:if] && !options[:if].respond_to?(:call)

        raise ArgumentError, "Invalid option :html for menu item '#{name}'" if options[:html] && !options[:html].is_a?(Hash)

        raise ArgumentError, "Cannot set the :parent to be the same as this item" if options[:parent] == name.to_sym

        raise ArgumentError, "Invalid option :children for menu item '#{name}'" if options[:children] && !options[:children].respond_to?(:call)

        @name = name

        @url = url

        @condition = options[:if]

        @param = options[:param] || :id

        @caption = options[:caption]

        @html_options = options[:html] || {}

        # Adds a unique class to each menu item based on its name

        @html_options[:class] = [@html_options[:class], @name.to_s.dasherize].compact.join(' ')

        @parent = options[:parent]

        @child_menus = options[:children]

        @last = options[:last] || false

        super @name.to_sym

      end

      def caption(project=nil)

        if @caption.is_a?(Proc)

          c = @caption.call(project).to_s

          c = @name.to_s.humanize if c.blank?

          c

        else

          if @caption.nil?

            l_or_humanize(name, :prefix => 'label_')

          else

            @caption.is_a?(Symbol) ? l(@caption) : @caption

          end

        end

      end

      def html_options(options={})

        if options[:selected]

          o = @html_options.dup

          o[:class] += ' selected'

          o

        else

          @html_options

        end

      end

    end    

  end

end