#lang typed/racket

(require "utils.rkt" typed/graph)

(provide dds%)

(define dds%
  (class object%
    #:forall (State Modality)
    (super-new)

    (: step (-> State (Listof State)))
    (define/public (step st)
      (map (inst cdr Modality State) (step/annotated st)))

    (: step/annotated (-> State (Listof (Pairof Modality State))))
    (define/abstract/error (step/annotated st))

    (: step* (-> (Listof State) (Listof State)))
    (define/public (step* sts)
      (remove-duplicates
       (apply append
              (for/list : (Listof (Listof State)) ([s sts])
                (step s)))))

    (: build-state-graph (-> (Listof State) Graph))
    (define/abstract/error (build-state-graph sts))

    (: build-state-graph/annotated (-> (Listof State) Graph))
    (define/abstract/error (build-state-graph/annotated sts))

    (: build-state-graph* (-> (Listof State) (U Integer 'full) Graph))
    (define/abstract/error (build-state-graph* sts nsteps))

    (: build-state-graph*/annotated (-> (Listof State) (U Integer 'full) Graph))
    (define/abstract/error (build-state-graph*/annotated nsteps sts))
    ))