package aerotun

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

func TestManagerPersistenceValidationAndStartupErrors(t *testing.T) {
	m := &Manager{instances: map[string]TunnelInstance{}, runners: map[string]*TunnelRunner{}, errors: map[string]string{}, filePath: filepath.Join(t.TempDir(), "instances.json")}
	cfg := TunnelInstance{Name: "atest", Mode: "client", LocalAddress: "10.99.0.1/24", PeerAddress: "10.99.0.2/24", RemoteEndpoint: "192.0.2.1:51830", PSK: testPSK, Disabled: true}
	saved, err := m.Save(cfg)
	if err != nil {
		t.Fatal(err)
	}
	info, err := os.Stat(m.filePath)
	if err != nil || info.Mode().Perm() != 0600 {
		t.Fatalf("config permissions: %v %v", info, err)
	}
	m2 := &Manager{instances: map[string]TunnelInstance{}, filePath: m.filePath}
	if err = m2.load(); err != nil {
		t.Fatal(err)
	}
	if got := m2.instances[saved.ID]; got.PSK != testPSK || !got.Disabled {
		t.Fatal("configuration did not roundtrip")
	}
	duplicate := cfg
	duplicate.ID = "duplicate"
	if _, err = m.Save(duplicate); err == nil {
		t.Fatal("duplicate interface name accepted")
	}
	// A bad endpoint fails before any interface creation, and surfaces to the UI.
	m.instances[saved.ID] = saved
	saved.RemoteEndpoint = "bad endpoint"
	m.instances[saved.ID] = saved
	if err = m.StartTunnel(saved.ID); err == nil {
		t.Fatal("startup failure hidden")
	}
	if got, _ := m.Get(saved.ID); got.Running || got.LastError == "" {
		t.Fatal("startup failure not exposed in telemetry")
	}
}
func TestManagerFailedPersistenceDoesNotChangeConfig(t *testing.T) {
	dir := t.TempDir()
	m := &Manager{instances: map[string]TunnelInstance{}, runners: map[string]*TunnelRunner{}, errors: map[string]string{}, filePath: filepath.Join(dir, "missing", "instances.json")}
	cfg := TunnelInstance{ID: "test", Name: "atest", Mode: "server", LocalAddress: "10.99.0.1/24", PSK: testPSK, Disabled: true}
	m.instances[cfg.ID] = cfg
	changed := cfg
	changed.Comment = "new"
	if _, err := m.Save(changed); err == nil {
		t.Fatal("expected persistence error")
	}
	if m.instances[cfg.ID].Comment != "" {
		t.Fatal("failed save changed in-memory configuration")
	}
	if err := m.ToggleState(cfg.ID, false); err == nil {
		t.Fatal("expected persistence error")
	}
	if !m.instances[cfg.ID].Disabled {
		t.Fatal("failed persistence enabled the tunnel")
	}
}