package link

import (
	"strings"
	"testing"
	"time"

	"github.com/nats-io/nats.go"
)

// A work-queue stream's dead letters are kept and shown as a restricted stream's are — aged with the
// stream, never with their body or headers — and can only be dropped, never delivered again (novox/hq ADR
// 0436 §6, changing ADR 0363 §7 for such a stream).

// 1178/AC3: a dead letter's headers say it came from a work-queue stream, and reading it back carries that
// (and the restricted flag its aging and hiding already key off, deadLetterOf being the one place both are
// read: see DeadLetter.Restricted's doc).
func TestAWorkQueueDeadLettersHeaderIsReadBack(t *testing.T) {
	agesOut := time.Now().Add(time.Hour).UTC()
	h := nats.Header{}
	h.Set(DeadHeaderStream, "MAIL_SENDS")
	h.Set(DeadHeaderConsumer, "novox_mesh-mail_send")
	h.Set(DeadHeaderSubject, "mesh.stream.mesh-mail.event.mail.send.approved")
	h.Set(DeadHeaderRestricted, "true")
	h.Set(DeadHeaderWorkQueue, "true")
	h.Set(DeadHeaderAgesOut, agesOut.Format(time.RFC3339Nano))

	d := deadLetterOf(42, "mesh.stream.mesh-mail.event.mail.send.approved", h, []byte("secret body"), false)
	if !d.WorkQueue {
		t.Fatalf("a work-queue dead letter read as %+v", d)
	}
	if !d.Restricted {
		t.Fatalf("a work-queue dead letter is not read as restricted, so it would be shown with its body: %+v", d)
	}
	if !d.AgesOut.Equal(agesOut) {
		t.Fatalf("ages out at %v, want %v — it should age with its stream", d.AgesOut, agesOut)
	}
}

// 1178/AC3: asking to deliver a work-queue dead letter again is refused, naming ADR 0436 clause 6 — before
// anything is asked of the bus, so it holds whatever max-deliver or age is left.
func TestAWorkQueueDeadLetterIsNeverDeliveredAgain(t *testing.T) {
	d := DeadLetter{ID: 7, Stream: "MAIL_SENDS", Consumer: "novox_mesh-mail_send",
		Subject: "mesh.stream.mesh-mail.event.mail.send.approved", WorkQueue: true, Restricted: true,
		AgesOut: time.Now().Add(time.Hour)}
	if _, err := AgainTo(nil, d); err == nil || !strings.Contains(err.Error(), "ADR 0436 clause 6") ||
		!strings.Contains(err.Error(), "Drop it") {
		t.Fatalf("delivering a work-queue dead letter again: %v; want a refusal naming ADR 0436 clause 6", err)
	}
}