package resolution

import (
	"strings"
	"testing"

	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
)

// The catalogue's module: /etc/hostname is the operator's `hostname` setting. Without it the module is
// left out, naming the key — the mesh never renames a machine on its own — and a mesh-wide setting
// naming ${machine:name} gives every machine its mesh name.
func TestTheMachinesNameIsItsSetting(t *testing.T) {
	cat := map[string]mcat.Manifest{"hostname": catalogueManifest(t, "hostname")}
	got, err := Resolve(cat, []string{"hostname"}, mcat.Node{Name: "ace", At: "ace.internal"}, mcat.World{})
	if err != nil {
		t.Fatal(err)
	}
	machines := map[string]string{"ace.internal": "10.42.0.2"}
	nameOf := func(settings mcat.SettingsBy) (string, string) {
		t.Helper()
		composed, err := Compose(got, mcat.Rendering{Names: machines, Machines: machines, Suffix: "internal",
			Settings: settings})
		if err != nil {
			t.Fatal(err)
		}
		if why := composed.LeftOut["hostname"]; why != "" {
			return "", why
		}
		for _, r := range composed.Resources {
			if r["path"] == "/etc/hostname" {
				return r["content"].(string), ""
			}
		}
		t.Fatal("no /etc/hostname composed")
		return "", ""
	}

	if _, why := nameOf(nil); !strings.Contains(why, "hostname") {
		t.Errorf("with no setting the machine's name was written, or left out for another reason: %q", why)
	}
	if name, why := nameOf(mcat.SettingsBy{"hostname": {{From: "ace", Values: map[string]any{"hostname": "Ace"}}}}); name != "Ace\n" {
		t.Errorf("the operator's name for the machine gave %q (%s)", name, why)
	}
	mesh := mcat.Layer{From: "the mesh", Values: map[string]any{"hostname": "${machine:name}"}}
	if name, why := nameOf(mcat.SettingsBy{"hostname": {mesh}}); name != "ace\n" {
		t.Errorf("a mesh-wide ${machine:name} gave %q (%s)", name, why)
	}
	node := mcat.Layer{From: "ace", Values: map[string]any{"hostname": "Ace"}}
	if name, why := nameOf(mcat.SettingsBy{"hostname": {mesh, node}}); name != "Ace\n" {
		t.Errorf("a machine's own name over the mesh-wide one gave %q (%s)", name, why)
	}
}