require 'fedux_org/stdlib/logging'
require 'fedux_org/stdlib/models/exceptions'

module FeduxOrg
  module Stdlib
    module Models
      class BaseModel

        include Comparable

        @instances = ::Set.new

        attr_reader :name

        def self.inherited(base)
          base.instance_variable_set(:@instances, Set.new)
        end

        def initialize(name)
          @name = name.to_sym
          @enabled = false
        end

        #enable action
        def enable
          @enabled = true
        end

        #check if action is enabled
        def enabled?(val=true)
          @enabled == val
        end

        def name?(name)
          @name == name
        end

        def <=>(other)
          name <=> other.name
        end

        def eql?(other)
          name == other.name
        end

        def hash
          self.name.to_s.hash 
        end

        class << self
          #attr_accessor :instances

          def register(element)
            @instances << element

            element
          end

          def create( *args, &block )
            if block_given?
              register( new( *args, &block ) )
            else
              register( new( *args ) )
            end
          end

          def delete( val )
            element = self.find( val.to_s.to_sym )
            raise FeduxOrg::Stdlib::Exceptions::InstanceNotFound unless element
            @instances.delete element

            element
          end

          def clear
            @instances = Set.new
          end

          def all
            @instances.to_a
          end

          #return all names as string
          def all_names_as_string(connector=", ")
            find_all(enabled: true).map(&:name).sort.join(connector)
          end

          def first
            @instances.to_a.first
          end

          def last
            @instances.to_a.last
          end

          #enables a specific instance
          def enable(name)
            find(name: name).enable
          rescue NoMethodError => e
            raise FeduxOrg::Stdlib::Models::Exceptions::InvalidSearchCriteria, "Sorry I'm not able to enable \"#{name}\". You need to create an instance with name \"#{name}\" first."
          end

          #finds a single instance
          def find( criteria={} )
            find_all( criteria ).first
          end

          #finds all instances
          def find_all( criteria={} )
            FeduxOrg::Stdlib.logger.debug(self) { "Criteria for search: #{ criteria }" }
            criteria = { name: criteria.to_sym } if criteria.kind_of? Symbol or criteria.kind_of? String

            FeduxOrg::Stdlib.logger.debug(self) { "Instances to be searched for: #{ @instances.map { |i| "#{i.name} (#{i.class})" }.join(", ") }" }
            @instances.find_all do |i| 
              criteria.all? do |c,v|

                FeduxOrg::Stdlib.logger.debug(self) { "Check method for search: #{ c }" }
                i.send( "#{c}?".to_sym , v )
              end
            end
          rescue NameError => e
            raise FeduxOrg::Stdlib::Models::Exceptions::InvalidSearchCriteria, e.message
          end
        end

      end
    end
  end
end