package broker

import (
	"flag"
	"os"
	"path/filepath"
	"testing"
)

var update = flag.Bool("update", false, "rewrite the golden composition")

// The composed file is the mesh's whole authority model, so a change to it should be visible in a
// review rather than inferred from a diff of Go. The fixture is also the exact text checked
// against the real server's parser (`nats-server -t`), which is what says this syntax is the
// server's and not one we invented.
func TestTheComposedConfigMatchesTheGolden(t *testing.T) {
	seat := Seat{Name: "telegram-sender", Accepts: []string{"send"}, Emits: []string{"delivered", "failed"}}
	got, err := Compose(
		Server{ClientPort: 4222, MonitoringPort: 8222, StoreDir: "/data",
			TLSCert: "/tls/tls.crt", TLSKey: "/tls/tls.key", TLSCA: "/tls/ca.crt"},
		[]Principal{
			{Kind: KindController, PasswordHash: "$2a$11$cccccccccccccccccccccc"},
			{Kind: KindEnrolment, PasswordHash: "$2a$11$eeeeeeeeeeeeeeeeeeeeee"},
			{Kind: KindNode, Node: "one", PasswordHash: "$2a$11$nnnnnnnnnnnnnnnnnnnnnn"},
			{Kind: KindModule, Node: "one", Module: "telegram", Holds: []Seat{seat},
				Serves: []string{"status"}, PasswordHash: "$2a$11$tttttttttttttttttttttt"},
			{Kind: KindModule, Node: "two", Module: "shop", Uses: []Seat{seat},
				Emits: []string{"order.placed"}, PasswordHash: "$2a$11$ssssssssssssssssssssss"},
			{Kind: KindModule, Node: "two", Module: "audit",
				Consumes: []string{"shop.order.placed"}, PasswordHash: "$2a$11$aaaaaaaaaaaaaaaaaaaaaa"},
		})
	if err != nil {
		t.Fatal(err)
	}
	golden := filepath.Join("testdata", "composed.conf")
	if *update {
		if err := os.WriteFile(golden, []byte(got), 0o644); err != nil {
			t.Fatal(err)
		}
		return
	}
	want, err := os.ReadFile(golden)
	if err != nil {
		t.Fatal(err)
	}
	if got != string(want) {
		t.Errorf("composition changed; re-run with -update and read the diff:\n%s", got)
	}
}