package initsys

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

	"github.com/warkanum/unitdore/config"
)

func TestDetect(t *testing.T) {
	tests := []struct {
		name  string
		paths []string
		want  string
	}{
		{"systemd", []string{"run/systemd/system"}, Systemd},
		{"openrc", []string{"run/openrc"}, OpenRC},
		{"openrc binary", []string{"sbin/openrc-run"}, OpenRC},
		{"runit", []string{"etc/runit"}, Runit},
		{"systemd wins", []string{"run/systemd/system", "etc/runit"}, Systemd},
		{"fallback", nil, Systemd},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			root := t.TempDir()
			for _, p := range tt.paths {
				if err := os.MkdirAll(filepath.Dir(filepath.Join(root, p)), 0755); err != nil {
					t.Fatal(err)
				}
				if err := os.WriteFile(filepath.Join(root, p), nil, 0644); err != nil {
					t.Fatal(err)
				}
			}
			if got := Detect(root); got != tt.want {
				t.Errorf("Detect() = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestNew(t *testing.T) {
	for _, name := range []string{Systemd, OpenRC, Runit} {
		ini, err := New(&config.Config{Init: name})
		if err != nil || ini.Name() != name {
			t.Errorf("New(%q) = %v, %v", name, ini, err)
		}
	}
	if _, err := New(&config.Config{Init: "sysv"}); err == nil {
		t.Error("New() should reject an unknown init")
	}
}