package transportcfg

import "testing"

func TestBackendUnitSingBoxUsesInstanceTemplateByDefault(t *testing.T) {
	client := Client{
		ID:   "sg-realnetns",
		Kind: KindSingBox,
	}
	got := BackendUnit(client)
	if got != "singbox@sg-realnetns.service" {
		t.Fatalf("unexpected singbox unit: %q", got)
	}
}

func TestBackendUnitSingBoxTemplateConfigExpandsInstance(t *testing.T) {
	client := Client{
		ID:   "sg-1",
		Kind: KindSingBox,
		Config: map[string]any{
			"unit": "singbox@.service",
		},
	}
	got := BackendUnit(client)
	if got != "singbox@sg-1.service" {
		t.Fatalf("unexpected template unit: %q", got)
	}
}

func TestBackendUnitSingBoxKeepsExplicitNonTemplateUnit(t *testing.T) {
	client := Client{
		ID:   "sg-realnetns",
		Kind: KindSingBox,
		Config: map[string]any{
			"unit": "custom-singbox.service",
		},
	}
	got := BackendUnit(client)
	if got != "custom-singbox.service" {
		t.Fatalf("unexpected custom unit: %q", got)
	}
}

func TestBackendUnitNonSingBoxUnchanged(t *testing.T) {
	client := Client{
		ID:   "dn-1",
		Kind: KindDNSTT,
		Config: map[string]any{
			"unit": "dnstt-custom.service",
		},
	}
	got := BackendUnit(client)
	if got != "dnstt-custom.service" {
		t.Fatalf("unexpected non-singbox unit: %q", got)
	}
}

func TestBackendUnitSingBoxSanitizesInstanceID(t *testing.T) {
	client := Client{
		ID:   " SG Real/NetNS ",
		Kind: KindSingBox,
	}
	got := BackendUnit(client)
	if got != "singbox@sg-real-netns.service" {
		t.Fatalf("unexpected sanitized singbox unit: %q", got)
	}
}