package process

import (
	"context"
	"strings"
	"testing"

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

func TestTheHubMatchesSubjectsAndRefusesOverlappingPatterns(t *testing.T) {
	for _, c := range []struct {
		a, b           string
		match, overlap bool
	}{
		{"mesh.mod.*.event.views.*", "mesh.mod.o.event.views.x", true, true},
		{"mesh.mod.p.event.>", "mesh.mod.p.event", false, false},
		{"mesh.mod.p.event.a", "mesh.mod.q.event.a", false, false},
		{"mesh.mod.p.event.>", "mesh.mod.*.event.a", false, true},
		{"mesh.mod.p.event.a", "mesh.mod.p.event.a.b", false, false},
	} {
		if got := subjectMatches(c.a, c.b); got != c.match && c.match {
			t.Errorf("%s should match %s", c.a, c.b)
		}
		if got := subjectsOverlap(c.a, c.b); got != c.overlap {
			t.Errorf("overlap(%s, %s) = %v", c.a, c.b, got)
		}
	}
	h := NewEventHub(nil)
	nop := func(jetstream.Msg) {}
	if err := h.Handle("mesh.mod.p.event.>", nop); err != nil {
		t.Fatal(err)
	}
	if err := h.Handle("mesh.mod.*.event.a", nop); err == nil {
		t.Fatal("an overlapping pattern was accepted")
	}
	if err := h.Handle("mesh.mod.q.event.>", nop); err != nil {
		t.Fatal(err)
	}
	// W1.12: a seat's event kept in a stream of its own is heard on one bus name and one durable, the maker's and the
	// hearer's alike; an event kept last per subject is delivered from the last of each subject. The name is the
	// contract's Stream<E> as it stands (seatdef.KeptStream), never made again here: a dotted or unprefixed name is
	// refused by name before the bus is asked.
	a := Account{Node: "ace", Module: "mesh-grants"}
	for _, stream := range []string{"node-engine.running", "SEAT_node-engine.running", "SEAT_", "EVENTS"} {
		if _, err := a.HearSeatEvents(context.Background(), nil, stream, func(jetstream.Msg) {}, nil); err == nil ||
			!strings.Contains(err.Error(), "is not the bus's name of a seat event's stream") {
			t.Errorf("hearing %q: %v", stream, err)
		}
	}
	cfg := a.SeatEventConsumerConfig([]string{"mesh.seat.node-engine.event.running.>"}, true)
	if cfg.Durable != "ace_mesh-grants" || cfg.DeliverPolicy != jetstream.DeliverLastPerSubjectPolicy ||
		cfg.AckPolicy != jetstream.AckExplicitPolicy || len(cfg.FilterSubjects) != 1 {
		t.Errorf("the durable on a stream kept last per subject: %+v", cfg)
	}
	if cfg := a.SeatEventConsumerConfig(nil, false); cfg.DeliverPolicy != jetstream.DeliverAllPolicy {
		t.Errorf("the durable on a stream kept with an age starts from its first message, got %v", cfg.DeliverPolicy)
	}
}