module RBS
  module AST
    module Members
      type t = MethodDefinition
             | InstanceVariable | ClassInstanceVariable | ClassVariable
             | Include | Extend | Prepend
             | AttrReader | AttrWriter | AttrAccessor
             | Public | Private
             | Alias

      # Base class for members.
      class Base
      end

      type visibility = :public | :private

      class MethodDefinition < Base
        type kind = :instance | :singleton | :singleton_instance

        # def foo: () -> void
        # ^^^                    keyword
        #     ^^^                name
        #
        # private def self.bar: () -> void | ...
        # ^^^^^^^                                  visibility
        #         ^^^                              keyword
        #             ^^^^^                        kind
        #                  ^^^                     name
        #                                    ^^^   overload
        #
        type loc = Location[:keyword | :name, :kind | :overload | :visibility]

        attr_reader name: Symbol
        attr_reader kind: kind
        attr_reader types: Array[MethodType]
        attr_reader annotations: Array[Annotation]
        attr_reader location: loc?
        attr_reader comment: Comment?
        attr_reader overload: bool
        attr_reader visibility: visibility?

        def initialize: (name: Symbol, kind: kind, types: Array[MethodType], annotations: Array[Annotation], location: loc?, comment: Comment?, overload: boolish, ?visibility: visibility?) -> void

        include _HashEqual
        include _ToJson

        def instance?: () -> bool

        def singleton?: () -> bool

        def overload?: () -> bool

        def update: (?name: Symbol, ?kind: kind, ?types: Array[MethodType], ?annotations: Array[Annotation], ?location: loc?, ?comment: Comment?, ?overload: boolish, ?visibility: visibility?) -> MethodDefinition
      end

      module Var
        # @foo: String
        # ^^^^            name
        #     ^           colon
        #
        # self.@all: Array[String]
        # ^^^^^                        kind
        #      ^^^^                    name
        #          ^                   colon
        #
        type loc = Location[:name | :colon, :kind]

        attr_reader name: Symbol
        attr_reader type: Types::t
        attr_reader location: loc?
        attr_reader comment: Comment?

        def initialize: (name: Symbol, type: Types::t, location: loc?, comment: Comment?) -> void

        include _HashEqual
      end

      class InstanceVariable < Base
        include Var
        include _ToJson
      end

      class ClassInstanceVariable < Base
        include Var
        include _ToJson
      end

      class ClassVariable < Base
        include Var
        include _ToJson
      end

      module Mixin
        # include Foo
        # ^^^^^^^       keyword
        #         ^^^   name
        #
        # include Array[String]
        # ^^^^^^^                keyword
        #         ^^^^^          name
        #              ^         arg_open
        #                     ^  arg_close
        #
        type loc = Location[:name | :keyword, :args]

        attr_reader name: TypeName
        attr_reader args: Array[Types::t]
        attr_reader annotations: Array[Annotation]
        attr_reader location: loc?
        attr_reader comment: Comment?

        def initialize: (name: TypeName, args: Array[Types::t], annotations: Array[Annotation], location: loc?, comment: Comment?) -> void

        include _HashEqual
      end

      class Include < Base
        include Mixin
        include _ToJson
      end

      class Extend < Base
        include Mixin
        include _ToJson
      end

      class Prepend < Base
        include Mixin
        include _ToJson
      end

      module Attribute
        type kind = :instance | :singleton

        # attr_reader name: String
        # ^^^^^^^^^^^                  keyword
        #             ^^^^             name
        #                 ^            colon
        #
        # public attr_accessor self.name (@foo) : String
        # ^^^^^^                                           visibility
        #        ^^^^^^^^^^^^^                             keyword
        #                      ^^^^^                       kind
        #                           ^^^^                   name
        #                                ^^^^^^            ivar
        #                                 ^^^^             ivar_name
        #                                       ^          colon
        #
        type loc = Location[:keyword | :name | :colon, :kind | :ivar | :ivar_name | :visibility]

        attr_reader name: Symbol
        attr_reader type: Types::t
        attr_reader kind: kind
        attr_reader ivar_name: Symbol | false | nil
        attr_reader annotations: Array[Annotation]
        attr_reader location: loc?
        attr_reader comment: Comment?
        attr_reader visibility: visibility?

        def initialize: (name: Symbol, type: Types::t, ivar_name: Symbol | false | nil, kind: kind, annotations: Array[Annotation], location: loc?, comment: Comment?, ?visibility: visibility?) -> void

        include _HashEqual

        def update: (?name: Symbol, ?type: Types::t, ?ivar_name: Symbol | false | nil, ?kind: kind, ?annotations: Array[Annotation], ?location: loc?, ?comment: Comment?, ?visibility: visibility?) -> instance
      end

      class AttrReader < Base
        include Attribute
        include _ToJson
      end

      class AttrAccessor < Base
        include Attribute
        include _ToJson
      end

      class AttrWriter < Base
        include Attribute
        include _ToJson
      end

      module LocationOnly
        attr_reader location: Location[bot, bot]?

        def initialize: (location: Location[bot, bot]?) -> void

        include _HashEqual
      end

      class Public < Base
        include LocationOnly
        include _ToJson
      end

      class Private < Base
        include LocationOnly
        include _ToJson
      end

      class Alias < Base
        type kind = :instance | :singleton

        # alias foo bar
        # ^^^^^           keyword
        #       ^^^       new_name
        #           ^^^   old_name
        #
        # alias self.foo self.bar
        # ^^^^^                      keyword
        #       ^^^^^                new_kind
        #            ^^^             new_name
        #                ^^^^^       old_kind
        #                     ^^^    old_name
        #
        type loc = Location[:keyword | :new_name | :old_name, :new_kind | :old_kind]

        attr_reader new_name: Symbol
        attr_reader old_name: Symbol
        attr_reader kind: kind
        attr_reader annotations: Array[Annotation]
        attr_reader location: loc?
        attr_reader comment: Comment?

        def initialize: (new_name: Symbol, old_name: Symbol, kind: kind, annotations: Array[Annotation], location: loc?, comment: Comment?) -> void

        include _HashEqual
        include _ToJson

        def instance?: () -> bool

        def singleton?: () -> bool
      end
    end
  end
end