package buscompose

import (
	"slices"
	"testing"
)

// A reader of a stream kept last per subject is granted what an ordered consumer of that stream uses, and a reader of
// another stream only its own durable (design 47 G §556, A-4).
func TestAReaderOfAStreamKeptLastPerSubjectIsGrantedItsOrderedConsumer(t *testing.T) {
	p := Principal{Module: "m", Node: "a"}
	ordered := []string{"$JS.API.CONSUMER.CREATE.S", "$JS.API.CONSUMER.MSG.NEXT.S.*", "$JS.API.CONSUMER.INFO.S.*", "$JS.API.CONSUMER.DELETE.S.*"}
	last := heardGrants(p, []Heard{{Stream: "S", Filters: []string{"f"}, LastPerSubject: true}})
	for _, w := range ordered {
		if !slices.Contains(last, w) {
			t.Errorf("a last-per-subject reader is not granted %s: %v", w, last)
		}
	}
	plain := heardGrants(p, []Heard{{Stream: "S", Filters: []string{"f"}}})
	if slices.Contains(plain, ordered[0]) {
		t.Errorf("a reader of another stream is granted an ordered consumer: %v", plain)
	}
}

// A reader of a seat's kept event is granted the info of that stream, which process.HearSeatEvents reads to see whether the
// stream is kept last per subject, and no stream's info besides (design 47 G §641, A-19).
func TestAReaderOfASeatsKeptEventIsGrantedItsStreamInfo(t *testing.T) {
	p := Principal{Module: "m", Node: "a"}
	kept := heardGrants(p, []Heard{{Stream: "SEAT_mesh-delivery_owed", Filters: []string{"f"}}})
	if !slices.Contains(kept, "$JS.API.STREAM.INFO.SEAT_mesh-delivery_owed") {
		t.Errorf("a reader of a seat's kept event is not granted its stream's info: %v", kept)
	}
	own := heardGrants(p, []Heard{{Stream: "BUILDER_BUILDS", Filters: []string{"f"}, LastPerSubject: true}})
	if !slices.Contains(own, "$JS.API.STREAM.INFO.BUILDER_BUILDS") {
		t.Errorf("a reader of a module's stream kept last per subject is not granted its info: %v", own)
	}
	other := heardGrants(p, []Heard{{Stream: "mesh-x-events", Filters: []string{"f"}}})
	if slices.Contains(other, "$JS.API.STREAM.INFO.mesh-x-events") {
		t.Errorf("a reader of a module's stream is granted its info: %v", other)
	}
}