package catalogue

import (
	"strings"
	"testing"
)

// Replay of novox/hq issue 166: every soft dependency had become a hard requirement. grafana runs without a
// data source, yet a manifest could not say so: a mesh without influxdb could not register a grafana that
// said its influxdb-api was optional, and with influxdb only in the catalogue, assigning grafana installed
// influxdb for it. Written only with what the catalogue had before its fix (mesh-controller #281):
// ParseManifest, Resolve, and the resolve tests' shelf, reachable machine and names, so it is laid over the
// commit before.
func TestReplay166(t *testing.T) {
	grafana, err := ParseManifest([]byte(`{"module":"grafana","version":"1",
		"requires":[{"name":"influxdb-api","optional":true}]}`))
	if err != nil {
		t.Fatalf("a manifest cannot say grafana runs without influxdb-api: %v", err)
	}
	catalogue := shelf(
		Manifest{Module: "influxdb", Version: "1", Provides: FromAnywhere("influxdb-api")},
		grafana,
	)
	// Nothing in the mesh runs influxdb; it is only in the catalogue.
	got, err := Resolve(catalogue, []string{"grafana"}, reachable(), World{})
	if err != nil {
		t.Fatalf("grafana could not be assigned on a mesh without influxdb: %v", err)
	}
	if have := strings.Join(names(got), " "); have != "grafana" {
		t.Fatalf("assigning grafana put %s on the machine; nothing is installed for an optional requirement", have)
	}
	if len(got.Needs) != 0 {
		t.Fatalf("grafana was given a binding with nothing providing it: %+v", got.Needs)
	}
	// And once influxdb runs somewhere, grafana binds to it as before.
	got, err = Resolve(catalogue, []string{"grafana"}, reachable(), World{Offered: map[string][]Provider{
		"influxdb-api": {{Node: "anchor", At: "anchor.internal", Module: "influxdb"}}}})
	if err != nil {
		t.Fatal(err)
	}
	if len(got.Needs) != 1 || got.Needs[0].From != "anchor" || got.Needs[0].For != "grafana" {
		t.Fatalf("grafana did not bind to influxdb on anchor: %+v", got.Needs)
	}
}