package catalogue

import (
	"strings"
	"testing"
)

// A zone names the listen that answers it, or there is nothing to forward to (novox/hq ADR 0199).
func TestAZoneMustNameOneOfTheModulesListens(t *testing.T) {
	_, err := ParseManifest([]byte(`{"module":"lab","version":"1",
		"listens":[{"name":"dns","port":5353,"protocol":"udp","from":"mesh","why":"the lab's names"}],
		"zone":{"name":"${setting:zone}","listen":"web"}}`))
	if err == nil || !strings.Contains(err.Error(), `has no listen of that name`) {
		t.Fatalf("a zone answered by a listen the module does not have was accepted: %v", err)
	}
	if _, err := ParseManifest([]byte(`{"module":"lab","version":"1",
		"listens":[{"name":"dns","port":5353,"protocol":"udp","from":"mesh","why":"the lab's names"}],
		"zone":{"name":"${setting:zone}","listen":"dns"}}`)); err != nil {
		t.Fatalf("a well-formed zone was refused: %v", err)
	}
}

// The zone is the operator's (a setting) and the port is where this machine publishes the listen —
// neither is the definition's to state.
func TestAZoneIsPlacedFromTheNodesSettingAndPublishedPort(t *testing.T) {
	m := Manifest{Module: "lab", Zone: &Zone{Name: "${setting:zone}", Listen: "dns"},
		Listens: []Listening{{Name: "dns", Port: 5353, From: FromMesh}}}
	z, err := ZoneOn(m, []Layer{{From: "node", Values: map[string]any{"zone": "Incus."}}},
		map[int]int{5353: 15353}, "workstation", "10.77.0.3")
	if err != nil {
		t.Fatal(err)
	}
	if z.Zone != "incus" || z.Address != "10.77.0.3" || z.Port != 15353 || z.Node != "workstation" {
		t.Fatalf("the zone was placed as %+v", *z)
	}
	if _, err := ZoneOn(m, nil, nil, "workstation", "10.77.0.3"); err == nil {
		t.Fatal("a zone nobody named was placed")
	}
}

// One module answers a zone, and none may shadow the mesh's names or a public domain.
func TestTheMeshRefusesAZoneTwiceOrOneThatShadows(t *testing.T) {
	one := ZoneAt{Zone: "incus", Node: "workstation", Module: "lab", Address: "10.77.0.3", Port: 53}
	if p := ZonesProblems([]ZoneAt{one}, "internal", []string{"example.tld"}); len(p) != 0 {
		t.Fatalf("one ordinary zone was refused: %v", p)
	}
	twice := one
	twice.Node, twice.Module = "laptop", "other"
	cases := map[string][]ZoneAt{
		"declared by":       {one, twice},
		"mesh's own suffix": {{Zone: "lab.internal", Node: "a", Module: "m"}},
		"public domain":     {{Zone: "dev.example.tld", Node: "a", Module: "m"}},
	}
	for want, zones := range cases {
		p := strings.Join(ZonesProblems(zones, "internal", []string{"example.tld"}), "\n")
		if !strings.Contains(p, want) {
			t.Errorf("not refused for %q: %q", want, p)
		}
	}
}

// The resolver's template sees every zone with where it is answered, in zone order.
func TestTheResolversTemplateRangesTheZones(t *testing.T) {
	m := Manifest{Module: "dnsmasq", Facts: map[string]RosterFile{"zones": {
		Path:     "/etc/mesh-resolver/zones.conf",
		Template: "{{range .Zones}}server=/{{.Zone}}/{{.Address}}#{{.Port}}\n{{end}}",
	}}}
	out, err := FactsWithZonesInto(m, Resolution{Node: "anchor"}, nil, nil, nil, "", []ZoneAt{
		{Zone: "zeta", Address: "10.77.0.2", Port: 53},
		{Zone: "incus", Address: "10.77.0.3", Port: 15353},
	})
	if err != nil {
		t.Fatal(err)
	}
	if got := out[0]["content"]; got != "server=/incus/10.77.0.3#15353\nserver=/zeta/10.77.0.2#53\n" {
		t.Fatalf("the resolver was told %q", got)
	}
}