class Story < Issue
    unloadable

    include RedmineBacklogs::List

    def self.condition(project_id, sprint_id, extras=[])
      c = ["project_id = ? AND tracker_id in (?) AND fixed_version_id = ?",
            project_id, Story.trackers, sprint_id]

      if extras.size > 0
        c[0] += ' ' + extras.shift
        c += extras
      end

      c
    end

    # this forces NULLS-LAST ordering
    ORDER = 'case when issues.position is null then 1 else 0 end ASC, case when issues.position is NULL then issues.id else issues.position end ASC'

    def self.backlog(project_id, sprint_id, options={})
      stories = []

      Story.find(:all,
                 :order => Story::ORDER,
                 :conditions => Story.condition(project_id, sprint_id),
                 :joins => :status,
                 :limit => options[:limit]).each_with_index {|story, i|
                        next if story.ancestors.any? {|ancestor| ancestor.is_task? }
                        story.rank = i + 1
                        stories << story
                      }

      stories
    end

    def self.product_backlog(project, limit=nil)
      return Story.backlog(project.id, nil, :limit => limit)
    end

    def self.sprint_backlog(project, sprint, options={})
      Story.backlog(project.id, sprint.id, options)
    end

    def self.create_and_position(params)
      attribs = params.select{|k,v| k != 'prev_id' and k != 'id' and Story.column_names.include? k }
      attribs = Hash[*attribs.flatten]

      Story.new(attribs).tap do |s|
        if s.save
          s.move_after(params['prev_id'])
        end
      end
    end

    def self.at_rank(project_id, sprint_id, rank)
      return Story.find(:first,
                        :order => Story::ORDER,
                        :conditions => Story.condition(project_id, sprint_id),
                        :joins => :status,
                        :limit => 1,
                        :offset => rank - 1)
    end

    def self.trackers
        trackers = Setting.plugin_redmine_backlogs[:story_trackers]
        return [] if trackers.blank?

        return trackers.map { |tracker| Integer(tracker) }
    end

    def tasks
      return Task.tasks_for(self.id)
    end

    def tasks_and_subtasks
      return [] unless Task.tracker
      self.descendants.find_all_by_tracker_id(Task.tracker)
    end

    def direct_tasks_and_subtasks
      return [] unless Task.tracker
      self.children.find_all_by_tracker_id(Task.tracker).collect { |t| [t] + t.descendants }.flatten
    end

    #def inherit_version_to_subtasks
    #  # we overwrite the version of all descending issues that are tasks
    #  self.direct_tasks_and_subtasks.each do |task|
    #    task.inherit_version_from(self)
    #    task.save! if task.changed?
    #  end
    #end

    def set_points(p)
        self.init_journal(User.current)

        if p.blank? || p == '-'
            self.update_attribute(:story_points, nil)
            return
        end

        if p.downcase == 's'
            self.update_attribute(:story_points, 0)
            return
        end

        p = Integer(p)
        if p >= 0
            self.update_attribute(:story_points, p)
            return
        end
    end

    def task_status
        closed = 0
        open = 0
        self.tasks.each {|task|
            if task.closed?
                closed += 1
            else
                open += 1
            end
        }
        return {:open => open, :closed => closed}
    end

    def update_and_position!(params)
      attribs = params.select{|k,v| k != 'id' and Story.column_names.include? k }
      attribs = Hash[*attribs.flatten]

      journalized_update_attributes(attribs).tap do |result|
        if result and params[:prev]
          reload
          move_after(params[:prev])
        end
      end
    end

  def rank=(r)
    @rank = r
  end

  def rank
    if self.position.blank?
      extras = ['and ((issues.position is NULL and issues.id <= ?) or not issues.position is NULL)', self.id]
    else
      extras = ['and not issues.position is NULL and issues.position <= ?', self.position]
    end

    @rank ||= Issue.count(:conditions => Story.condition(self.project.id, self.fixed_version_id, extras), :joins => :status)

    return @rank
  end
end