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# ActsAsWatchable

module Redmine

  module Acts

    module Watchable

      def self.included(base) 

        base.extend ClassMethods

      end 

      module ClassMethods

        def acts_as_watchable(options = {})

          return if self.included_modules.include?(Redmine::Acts::Watchable::InstanceMethods)          

          send :include, Redmine::Acts::Watchable::InstanceMethods

          class_eval do

            has_many :watchers, :as => :watchable, :dependent => :delete_all

            has_many :watcher_users, :through => :watchers, :source => :user, :validate => false

            named_scope :watched_by, lambda { |user_id|

              { :include => :watchers,

                :conditions => ["#{Watcher.table_name}.user_id = ?", user_id] }

            }

            attr_protected :watcher_ids, :watcher_user_ids

          end

        end

      end

      module InstanceMethods

        def self.included(base)

          base.extend ClassMethods

        end

        # Returns an array of users that are proposed as watchers

        def addable_watcher_users

          users = self.project.users.sort - self.watcher_users

          if respond_to?(:visible?)

            users.reject! {|user| !visible?(user)}

          end

          users

        end

        # Adds user as a watcher

        def add_watcher(user)

          self.watchers << Watcher.new(:user => user)

        end

        # Removes user from the watchers list

        def remove_watcher(user)

          return nil unless user && user.is_a?(User)

          Watcher.delete_all "watchable_type = '#{self.class}' AND watchable_id = #{self.id} AND user_id = #{user.id}"

        end

        # Adds/removes watcher

        def set_watcher(user, watching=true)

          watching ? add_watcher(user) : remove_watcher(user)

        end

        # Returns true if object is watched by +user+

        def watched_by?(user)

          !!(user && self.watcher_user_ids.detect {|uid| uid == user.id })

        end

        # Returns an array of watchers' email addresses

        def watcher_recipients

          notified = watcher_users.active

          notified.reject! {|user| user.mail_notification == 'none'}

          if respond_to?(:visible?)

            notified.reject! {|user| !visible?(user)}

          end

          notified.collect(&:mail).compact

        end

        module ClassMethods; end

      end

    end

  end

end