package main

// lemurs's shape (novox/hq ADR 0208): it holds node-login-manager; it owns the configuration in
// lemurs 0.4's format and enables the service without ever starting, stopping or restarting it,
// because the running login manager is the operator's way in.

import (
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

type manifest struct {
	Module       string   `json:"module"`
	Capabilities []string `json:"capabilities"`
	Claims       []struct {
		Name   string   `json:"name"`
		Scope  string   `json:"scope"`
		Serves []string `json:"serves"`
	} `json:"claims"`
	Seats     any              `json:"seats"`
	Tools     []string         `json:"tools"`
	Resources []map[string]any `json:"resources"`
	Build     struct {
		Artifacts []map[string]any `json:"artifacts"`
	} `json:"build"`
}

func readManifest(t *testing.T) manifest {
	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
	if err != nil {
		t.Fatal(err)
	}
	var m manifest
	if err := json.Unmarshal(raw, &m); err != nil {
		t.Fatal(err)
	}
	return m
}

func resource(t *testing.T, m manifest, id string) map[string]any {
	for _, r := range m.Resources {
		if r["id"] == id {
			return r
		}
	}
	t.Fatalf("no resource %s", id)
	return nil
}

func TestItHoldsTheLoginManagerSeatAndServesSessions(t *testing.T) {
	m := readManifest(t)
	if m.Seats != nil || len(m.Claims) != 1 || m.Claims[0].Name != "node-login-manager" || strings.Join(m.Claims[0].Serves, ",") != "sessions" {
		t.Fatalf("%+v", m.Claims)
	}
	served := map[string]bool{}
	for _, tool := range tools(lemurs{}) {
		served[tool.Name] = true
	}
	if !served["node-login-manager.sessions"] || len(served) != 1+len(m.Tools) {
		t.Fatalf("served %v, manifest %v", served, m.Tools)
	}
	for _, name := range m.Tools {
		if !served[name] {
			t.Errorf("%s is listed and not served", name)
		}
	}
}

func TestTheOfficialPackageAndItsServiceEnabledButNeverRestarted(t *testing.T) {
	m := readManifest(t)
	if p := resource(t, m, "package"); p["package"] != "lemurs" {
		t.Fatalf("the official package, not lemurs-git: %v", p)
	}
	s := resource(t, m, "service")
	// Running and enabled: the host refuses boot without a state (a stateless service declares only
	// its triggers). Running starts it only where it is not; with no trigger, nothing restarts it.
	if s["unit"] != "lemurs.service" || s["boot"] != "enabled" || s["state"] != "running" {
		t.Fatalf("%v", s)
	}
	for _, k := range []string{"restart-on", "reload-on"} {
		if _, ok := s[k]; ok {
			t.Fatalf("the login manager is never restarted by a push (%s): a change applies at its next start", k)
		}
	}
	if strings.Join(m.Capabilities, ",") != "package-manager,service-manager,seat" {
		t.Fatalf("%v", m.Capabilities)
	}
}

func TestTheConfigurationIsTheModulesFileAndOffersOnlyTheSessionsModulesPlace(t *testing.T) {
	m := readManifest(t)
	c := resource(t, m, "config")
	raw, _ := os.ReadFile(filepath.Join("..", "..", "config", "config.toml"))
	if c["path"] != "/etc/lemurs/config.toml" || c["content"] != string(raw) || c["into"] != nil {
		t.Fatal("the manifest carries config/config.toml whole, as an owned file")
	}
	text := c["content"].(string)
	for _, want := range []string{"[x11]", "[wayland]", `xsetup_path = "/etc/lemurs/xsetup.sh"`, `scripts_path = "/etc/lemurs/wms"`,
		`scripts_path = "/etc/lemurs/wayland"`, `xsessions_path = "/etc/lemurs/xsessions"`, `wayland_sessions_path = "/etc/lemurs/wayland-sessions"`,
		`tty = 2`, `x11_display = ":1"`, `remember = true`} {
		if !strings.Contains(text, want) {
			t.Errorf("the configuration lacks %s", want)
		}
	}
	for _, l := range strings.Split(text, "\n") {
		if (strings.HasPrefix(l, "xsessions_path") || strings.HasPrefix(l, "wayland_sessions_path")) && strings.Contains(l, "/usr/share") {
			t.Fatalf("a package's bare desktop entry would be offered: %s", l)
		}
	}
	for _, id := range []string{"xsessions", "wayland-sessions"} {
		if d := resource(t, m, id); d["type"] != "directory" || d["path"] != "/etc/lemurs/"+id {
			t.Fatalf("%v", d)
		}
	}
}