require 'ferret'

require 'pyrosoma/database'
require 'pyrosoma/pattern'

class Pyrosoma
  class Dispatcher
    attr_accessor :paths
    
    def initialize(db)
      @db = db
      db.add_observer self
      update_all
    end

    def update(frame)
      paths.delete_if { |(f, p)| f == frame[:id] }
      if frame[:path]
        paths << [frame[:id], Pattern.new(frame[:path])]
      end

      sort!
    end

    def update_all
      self.paths = []
      @db.search_each(Ferret::Search::WildcardQuery.new(:path, "/*")) { |frame,_|
        update @db[frame]
      }
    end

    def sort!
      self.paths = paths.sort_by { |(f, p)| p.generality }
    end

    def dispatch(path)
      matching_frame, matching_pattern = paths.find { |frame, pattern|
        pattern =~ path
      }

      if matching_frame.nil?
        return nil              # not found
      end

      match = matching_pattern.match(path)
      @db[matching_frame].merge(match)
    end
  end
end