%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/strsplit % (ajbjc) (j) -> [ (a) (b) (c) ]
{
    1 dict begin
    /sep exch def
    [ exch
      {
          dup length 0 eq {
              pop
              exit
          } {
              sep search {
                  exch pop
                  dup length 0 eq {
                      pop
                  } {
                      exch
                  } ifelse
              } {
                  ()
              } ifelse
          } ifelse
      } loop
    ]
    end
} bind def

/deepeq {
    2 dict begin
    /a exch def
    /b exch def
    a type b type eq {
        a type /dicttype eq {
            a length b length eq {
                <<
                    a {
                        pop
                        true
                    } forall
                    b {
                        pop
                        true
                    } forall
                >>
                true exch
                {
                    pop
                    dup a exch known {
                        dup b exch known {
                            dup a exch get exch b exch get deepeq not {
                                pop false
                            } if
                        } {
                            false
                        } ifelse
                    } {
                        false
                    } ifelse
                } forall
            } {
                false
            } ifelse
        } {
            a type dup /arraytype eq exch /stringtype eq or {
                a length b length eq {
                    true
                    0 1 a length 1 sub {
                        dup a exch get exch b exch get deepeq not {
                            pop false
                            exit
                        } if
                    } for
                } {
                    false
                } ifelse
            } {
                a b eq
            } ifelse
        } ifelse
    } {
        false
    } ifelse
    end
} bind def

/apush.right { % [a b] c -> [a b c]
    exch
    [ exch aload length 2 add -1 roll ]
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def

/toset { % array -> dict of (value, true)
    << exch
       {
           true
       } forall
    >>
} bind def


% end included library code

/secretsanta {
    0 dict begin
    /name exch def
    /family [
        name {
            ( ) strsplit 1 get
        } forall
    ] def
    /receivers [ 0 1 name length 1 sub { } for ] toset def
    /gifting 0 array def
    0 1 name length 1 sub {
        /giver exch def
        /done false def
        /r 0 def
        receivers keys {
            /recipient exch def
            family giver get family recipient get deepeq not {
                /r recipient def
                /done true def
                exit
            } if
        } forall
        done not {
            receivers keys {
                /recipient exch def
                recipient giver ne {
                    /r recipient def
                    exit
                } if
            } forall
        } if
        receivers r undef
        /gifting gifting [ name giver get name r get ] apush.right def
    } for
    gifting {
        /p exch def
        p 0 get print
        ( -> ) print
        p 1 get =
    } forall
    () =
    true
    end
} bind def

(secretsanta) test.start
[(Mr. Wall) (Mrs. Wall) (Mr. Anwar) (Mrs. Anwar) (Mr. Conway) (Mr. Cross)] secretsanta test
[(Mr. Wall) (Mrs. Wall) (Mr. Anwar)] secretsanta test
test.end