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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.

module Redmine #:nodoc:

  class PluginNotFound < StandardError; end

  class PluginRequirementError < StandardError; end

  # Base class for Redmine plugins.

  # Plugins are registered using the <tt>register</tt> class method that acts as the public constructor.

  # 

  #   Redmine::Plugin.register :example do

  #     name 'Example plugin'

  #     author 'John Smith'

  #     description 'This is an example plugin for Redmine'

  #     version '0.0.1'

  #     settings :default => {'foo'=>'bar'}, :partial => 'settings/settings'

  #   end

  # 

  # === Plugin attributes

  # 

  # +settings+ is an optional attribute that let the plugin be configurable.

  # It must be a hash with the following keys:

  # * <tt>:default</tt>: default value for the plugin settings

  # * <tt>:partial</tt>: path of the configuration partial view, relative to the plugin <tt>app/views</tt> directory

  # Example:

  #   settings :default => {'foo'=>'bar'}, :partial => 'settings/settings'

  # In this example, the settings partial will be found here in the plugin directory: <tt>app/views/settings/_settings.rhtml</tt>.

  # 

  # When rendered, the plugin settings value is available as the local variable +settings+

  class Plugin

    @registered_plugins = {}

    class << self

      attr_reader :registered_plugins

      private :new

      def def_field(*names)

        class_eval do 

          names.each do |name|

            define_method(name) do |*args| 

              args.empty? ? instance_variable_get("@#{name}") : instance_variable_set("@#{name}", *args)

            end

          end

        end

      end

    end

    def_field :name, :description, :url, :author, :author_url, :version, :settings

    attr_reader :id

    # Plugin constructor

    def self.register(id, &block)

      p = new(id)

      p.instance_eval(&block)

      # Set a default name if it was not provided during registration

      p.name(id.to_s.humanize) if p.name.nil?

      # Adds plugin locales if any

      # YAML translation files should be found under <plugin>/config/locales/

      ::I18n.load_path += Dir.glob(File.join(RAILS_ROOT, 'vendor', 'plugins', id.to_s, 'config', 'locales', '*.yml'))

      registered_plugins[id] = p

    end

    # Returns an array off all registered plugins

    def self.all

      registered_plugins.values.sort

    end

    # Finds a plugin by its id

    # Returns a PluginNotFound exception if the plugin doesn't exist

    def self.find(id)

      registered_plugins[id.to_sym] || raise(PluginNotFound)

    end

    # Clears the registered plugins hash

    # It doesn't unload installed plugins

    def self.clear

      @registered_plugins = {}

    end

    # Checks if a plugin is installed

    #

    # @param [String] id name of the plugin

    def self.installed?(id)

      registered_plugins[id.to_sym].present?

    end

    def initialize(id)

      @id = id.to_sym

    end

    def <=>(plugin)

      self.id.to_s <=> plugin.id.to_s

    end

    # Sets a requirement on Redmine version

    # Raises a PluginRequirementError exception if the requirement is not met

    #

    # Examples

    #   # Requires Redmine 0.7.3 or higher

    #   requires_redmine :version_or_higher => '0.7.3'

    #   requires_redmine '0.7.3'

    #

    #   # Requires a specific Redmine version

    #   requires_redmine :version => '0.7.3'              # 0.7.3 only

    #   requires_redmine :version => ['0.7.3', '0.8.0']   # 0.7.3 or 0.8.0

    def requires_redmine(arg)

      arg = { :version_or_higher => arg } unless arg.is_a?(Hash)

      arg.assert_valid_keys(:version, :version_or_higher)

      current = Redmine::VERSION.to_a

      arg.each do |k, v|

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

        versions = v.collect {|s| s.split('.').collect(&:to_i)}

        case k

        when :version_or_higher

          raise ArgumentError.new("wrong number of versions (#{versions.size} for 1)") unless versions.size == 1

          unless (current <=> versions.first) >= 0

            raise PluginRequirementError.new("#{id} plugin requires Redmine #{v} or higher but current is #{current.join('.')}")

          end

        when :version

          unless versions.include?(current.slice(0,3))

            raise PluginRequirementError.new("#{id} plugin requires one the following Redmine versions: #{v.join(', ')} but current is #{current.join('.')}")

          end

        end

      end

      true

    end

    # Sets a requirement on a Redmine plugin version

    # Raises a PluginRequirementError exception if the requirement is not met

    #

    # Examples

    #   # Requires a plugin named :foo version 0.7.3 or higher

    #   requires_redmine_plugin :foo, :version_or_higher => '0.7.3'

    #   requires_redmine_plugin :foo, '0.7.3'

    #

    #   # Requires a specific version of a Redmine plugin

    #   requires_redmine_plugin :foo, :version => '0.7.3'              # 0.7.3 only

    #   requires_redmine_plugin :foo, :version => ['0.7.3', '0.8.0']   # 0.7.3 or 0.8.0

    def requires_redmine_plugin(plugin_name, arg)

      arg = { :version_or_higher => arg } unless arg.is_a?(Hash)

      arg.assert_valid_keys(:version, :version_or_higher)

      plugin = Plugin.find(plugin_name)

      current = plugin.version.split('.').collect(&:to_i)

      arg.each do |k, v|

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

        versions = v.collect {|s| s.split('.').collect(&:to_i)}

        case k

        when :version_or_higher

          raise ArgumentError.new("wrong number of versions (#{versions.size} for 1)") unless versions.size == 1

          unless (current <=> versions.first) >= 0

            raise PluginRequirementError.new("#{id} plugin requires the #{plugin_name} plugin #{v} or higher but current is #{current.join('.')}")

          end

        when :version

          unless versions.include?(current.slice(0,3))

            raise PluginRequirementError.new("#{id} plugin requires one the following versions of #{plugin_name}: #{v.join(', ')} but current is #{current.join('.')}")

          end

        end

      end

      true

    end

    # Adds an item to the given +menu+.

    # The +id+ parameter (equals to the project id) is automatically added to the url.

    #   menu :project_menu, :plugin_example, { :controller => 'example', :action => 'say_hello' }, :caption => 'Sample'

    #   

    # +name+ parameter can be: :top_menu, :account_menu, :application_menu or :project_menu

    # 

    def menu(menu, item, url, options={})

      Redmine::MenuManager.map(menu).push(item, url, options)

    end

    alias :add_menu_item :menu

    # Removes +item+ from the given +menu+.

    def delete_menu_item(menu, item)

      Redmine::MenuManager.map(menu).delete(item)

    end

    # Defines a permission called +name+ for the given +actions+.

    # 

    # The +actions+ argument is a hash with controllers as keys and actions as values (a single value or an array):

    #   permission :destroy_contacts, { :contacts => :destroy }

    #   permission :view_contacts, { :contacts => [:index, :show] }

    # 

    # The +options+ argument can be used to make the permission public (implicitly given to any user)

    # or to restrict users the permission can be given to.

    # 

    # Examples

    #   # A permission that is implicitly given to any user

    #   # This permission won't appear on the Roles & Permissions setup screen

    #   permission :say_hello, { :example => :say_hello }, :public => true

    # 

    #   # A permission that can be given to any user

    #   permission :say_hello, { :example => :say_hello }

    #   

    #   # A permission that can be given to registered users only

    #   permission :say_hello, { :example => :say_hello }, :require => :loggedin

    #   

    #   # A permission that can be given to project members only

    #   permission :say_hello, { :example => :say_hello }, :require => :member

    def permission(name, actions, options = {})

      if @project_module

        Redmine::AccessControl.map {|map| map.project_module(@project_module) {|map|map.permission(name, actions, options)}}

      else

        Redmine::AccessControl.map {|map| map.permission(name, actions, options)}

      end

    end

    # Defines a project module, that can be enabled/disabled for each project.

    # Permissions defined inside +block+ will be bind to the module.

    # 

    #   project_module :things do

    #     permission :view_contacts, { :contacts => [:list, :show] }, :public => true

    #     permission :destroy_contacts, { :contacts => :destroy }

    #   end

    def project_module(name, &block)

      @project_module = name

      self.instance_eval(&block)

      @project_module = nil

    end

    # Registers an activity provider.

    #

    # Options:

    # * <tt>:class_name</tt> - one or more model(s) that provide these events (inferred from event_type by default)

    # * <tt>:default</tt> - setting this option to false will make the events not displayed by default

    # 

    # A model can provide several activity event types.

    # 

    # Examples:

    #   register :news

    #   register :scrums, :class_name => 'Meeting'

    #   register :issues, :class_name => ['Issue', 'Journal']

    # 

    # Retrieving events:

    # Associated model(s) must implement the find_events class method.

    # ActiveRecord models can use acts_as_activity_provider as a way to implement this class method.

    # 

    # The following call should return all the scrum events visible by current user that occured in the 5 last days: 

    #   Meeting.find_events('scrums', User.current, 5.days.ago, Date.today)

    #   Meeting.find_events('scrums', User.current, 5.days.ago, Date.today, :project => foo) # events for project foo only

    # 

    # Note that :view_scrums permission is required to view these events in the activity view.

    def activity_provider(*args)

      Redmine::Activity.register(*args)

    end

    # Registers a wiki formatter.

    #

    # Parameters:

    # * +name+ - human-readable name

    # * +formatter+ - formatter class, which should have an instance method +to_html+

    # * +helper+ - helper module, which will be included by wiki pages

    def wiki_format_provider(name, formatter, helper)

      Redmine::WikiFormatting.register(name, formatter, helper)

    end

    # Returns +true+ if the plugin can be configured.

    def configurable?

      settings && settings.is_a?(Hash) && !settings[:partial].blank?

    end

  end

end