package catalogue

import (
	"strings"
	"testing"
)

// novox/hq ADR 0066 — public routing is name-agnostic.
//
// A route contribution carries a label (the subdomain the operator chose); the node carries its
// public domain; the mesh composes <label>.<public-domain> and interprets neither half. The
// checks here are the ADR's own: the same catalogue resolves against two domains by changing one
// node setting and nothing else, and a legacy full-name contribution passes through untouched so
// the catalogue can migrate module by module.

// labelled is a module that asks to be published under a subdomain rather than a full hostname.
func labelled(module, label string, port int) Manifest {
	return Manifest{Module: module, Version: "1",
		Contributes: map[string]map[string]any{
			"reverse-proxy": {"label": label, "port": port},
		}}
}

// withDomain is a workstation that composes its routed names under one public domain.
func withDomain(domain string) Node {
	n := workstation()
	n.PublicDomain = domain
	return n
}

func TestALabelComposesWithTheNodesPublicDomain(t *testing.T) {
	got, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
		[]string{"board"}, withDomain("example.tld"), World{})
	if err != nil {
		t.Fatal(err)
	}
	given := received(t, mustDeclare(t, got))
	if len(given) != 1 {
		t.Fatalf("the proxy was told about %d of 1: %v", len(given), given)
	}
	if given[0].Values["name"] != "git.example.tld" {
		t.Fatalf("the label did not compose with the domain: %v", given[0].Values)
	}
	// The port the module gave is still there — composing the name must not drop what the proxy
	// needs to reach the workload.
	if given[0].Values["port"] != float64(8080) {
		t.Fatalf("composing the name dropped the port: %v", given[0].Values)
	}
}

func TestTheApexLabelComposesToTheBareDomain(t *testing.T) {
	got, err := Resolve(shelf(proxy(), labelled("board", "@", 4000)),
		[]string{"board"}, withDomain("example.tld"), World{})
	if err != nil {
		t.Fatal(err)
	}
	given := received(t, mustDeclare(t, got))
	if len(given) != 1 {
		t.Fatalf("the proxy was told about %d of 1: %v", len(given), given)
	}
	// `@` is the zone-file apex: served at the bare public domain, no subdomain, no leading dot.
	if given[0].Values["name"] != "example.tld" {
		t.Fatalf("the apex label did not compose to the bare domain: %v", given[0].Values)
	}
}

func TestOneNodeSettingMovesTheCatalogueBetweenDomains(t *testing.T) {
	// The ADR's name-agnostic check: the same catalogue resolves against two different public
	// domains by changing one node setting and nothing else.
	one, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
		[]string{"board"}, withDomain("example.tld"), World{})
	if err != nil {
		t.Fatal(err)
	}
	two, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
		[]string{"board"}, withDomain("other.example"), World{})
	if err != nil {
		t.Fatal(err)
	}

	first := received(t, mustDeclare(t, one))[0].Values
	second := received(t, mustDeclare(t, two))[0].Values

	if first["name"] != "git.example.tld" || second["name"] != "git.other.example" {
		t.Fatalf("the name did not track the domain: %v then %v", first["name"], second["name"])
	}
	// And nothing else moved: same label, same port. The domain is the one fact that changed.
	if first["label"] != second["label"] || first["label"] != "git" {
		t.Fatalf("the label changed with the domain: %v then %v", first["label"], second["label"])
	}
	if first["port"] != second["port"] {
		t.Fatalf("the port changed with the domain: %v then %v", first["port"], second["port"])
	}
}

func TestALegacyFullNameContributionPassesThroughUnchanged(t *testing.T) {
	// Backward compatibility: a contribution that still carries a full `name` and no `label` is
	// granted that name as-is, even on a node that has a public domain. This is what lets the
	// catalogue migrate one module at a time while the running mesh keeps working.
	legacy := Manifest{Module: "board", Version: "1",
		Contributes: map[string]map[string]any{
			"reverse-proxy": {"name": "git.pinned.example", "port": 8080},
		}}
	got, err := Resolve(shelf(proxy(), legacy), []string{"board"}, withDomain("example.tld"), World{})
	if err != nil {
		t.Fatal(err)
	}
	given := received(t, mustDeclare(t, got))
	if given[0].Values["name"] != "git.pinned.example" {
		t.Fatalf("a full name was rewritten: %v", given[0].Values)
	}
	if _, grewLabel := given[0].Values["label"]; grewLabel {
		t.Fatalf("a legacy contribution grew a label: %v", given[0].Values)
	}
}

func TestALabelWithNoPublicDomainComposesNothing(t *testing.T) {
	// A routed module on a node with no public domain has nothing to join its label to. It composes
	// no name — which reads downstream exactly as a route that named no host, the same as before
	// this existed — rather than an fabricated `git.` with a dangling dot.
	got, err := Resolve(shelf(proxy(), labelled("board", "git", 8080)),
		[]string{"board"}, workstation(), World{})
	if err != nil {
		t.Fatal(err)
	}
	given := received(t, mustDeclare(t, got))
	if _, named := given[0].Values["name"]; named {
		t.Fatalf("a name was composed with no domain to compose it from: %v", given[0].Values)
	}
	if given[0].Values["label"] != "git" {
		t.Fatalf("the label was lost: %v", given[0].Values)
	}
}

func TestARoutedNameResolvesToTheServingNode(t *testing.T) {
	// novox/hq ADR 0066 propagate: a granted route name is published into internal resolution,
	// mapped to the node that serves it, alongside the `<node>.internal` names — so every
	// container, and an in-mesh ACME validator, resolves a routed name to the proxy that serves it.
	// The names map is what withMeshNames writes into every container as `--add-host`; a route name
	// mapped to the serving node's address rides the same mechanism.
	got := containersOf(t, Resolution{Node: "anchor", Modules: []Manifest{{
		Module: "app",
		Resources: []map[string]any{{"id": "web", "type": "container", "name": "web",
			"image": "registry.example/web@sha256:" + strings.Repeat("a", 64)}},
	}}}, Rendering{Names: map[string]string{
		"anchor.internal": "10.42.0.1",
		"git.example.tld": "10.42.0.1",
	}})
	if len(got) != 1 {
		t.Fatalf("expected one container, got %d", len(got))
	}
	given := namesOf(got[0])
	var sawNode, sawRoute bool
	for _, h := range given {
		if h == "anchor.internal:10.42.0.1" {
			sawNode = true
		}
		if h == "git.example.tld:10.42.0.1" {
			sawRoute = true
		}
	}
	if !sawNode {
		t.Fatalf("the container lost the mesh's node names: %v", given)
	}
	if !sawRoute {
		t.Fatalf("the routed name was not published to the serving node: %v", given)
	}
}