package service

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"strings"
	"testing"

	"github.com/op/go-logging"

	"github.com/mhsanaei/3x-ui/v3/internal/amneziawg"
	"github.com/mhsanaei/3x-ui/v3/internal/amneziawgkern"
	"github.com/mhsanaei/3x-ui/v3/internal/amneziawgnet"
	"github.com/mhsanaei/3x-ui/v3/internal/database"
	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
	"github.com/mhsanaei/3x-ui/v3/internal/logger"
	wgutil "github.com/mhsanaei/3x-ui/v3/internal/util/wireguard"
)

// A real X25519 pair, so PublicKeyFromPrivate agrees with the stored value.
var awgTestPrivateKey, awgTestPublicKey = func() (string, string) {
	priv, pub, err := wgutil.GenerateWireguardKeypair()
	if err != nil {
		panic(err)
	}
	return priv, pub
}()

func TestNormalizeAmneziaWGSettingsRejectsKernelSubnetMismatch(t *testing.T) {
	setupConflictDB(t)
	for _, remote := range []bool{false, true} {
		t.Run(fmt.Sprintf("remote=%t", remote), func(t *testing.T) {
			server, err := defaultAmneziaWGServer()
			if err != nil {
				t.Fatal(err)
			}
			server.SubnetIP = "10.9.1.0"
			client := model.Client{Email: "restored@awg", Enable: true, PublicKey: awgTestPublicKey, AllowedIPs: []string{"10.8.1.2/32"}}
			settings := amneziawg.InboundSettings{Server: server, Clients: []model.Client{client}}
			marshal := func() string {
				b, err := json.Marshal(settings)
				if err != nil {
					t.Fatal(err)
				}
				return string(b)
			}
			old := &model.Inbound{Protocol: model.AmneziaWG, Enable: true, Settings: marshal()}
			if remote {
				old.NodeID = new(7)
			}
			if err := (&InboundService{}).normalizeAmneziaWGSettings(old, nil); err != nil {
				t.Fatalf("embedded mode must remain editable: %v", err)
			}
			server.KernelMode = true
			inbound := *old
			inbound.Settings = marshal()
			err = (&InboundService{}).normalizeAmneziaWGSettings(&inbound, old)
			if err == nil || !strings.Contains(err.Error(), `peer "restored@awg" allowedIPs "10.8.1.2/32" is outside kernel interface subnets [10.9.1.0/24]`) {
				t.Fatalf("kernel-mode save error = %v, want the mismatched peer and server subnet", err)
			}
			inbound.Enable = false
			if err := (&InboundService{}).normalizeAmneziaWGSettings(&inbound, old); err != nil {
				t.Fatalf("disabling a broken inbound must remain possible: %v", err)
			}
		})
	}
}

func TestCheckForwardedPortsConflict_EmptySpecNoConflict(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	if hit := svc.checkForwardedPortsConflict(ctx, ""); hit != "" {
		t.Fatalf("an empty spec must never conflict; got hit=%q", hit)
	}
}

func TestCheckForwardedPortsConflict_CollidesWithPanelPort(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	// getString falls back to defaultValueMap's "webPort": "2053" on a fresh
	// DB with no explicit setting row.
	hit := svc.checkForwardedPortsConflict(ctx, "2053")
	if !strings.Contains(hit, "panel") {
		t.Fatalf("expected a collision naming the panel's own port, got %q", hit)
	}
}

func TestCheckForwardedPortsConflict_CollidesWithEnabledInboundPort(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "vless-8080", "0.0.0.0", 8080, model.VLESS, `{"network":"tcp"}`, `{}`)

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	hit := svc.checkForwardedPortsConflict(ctx, "8075-8085")
	if !strings.Contains(hit, "vless-8080") {
		t.Fatalf("expected a collision naming the colliding inbound, got %q", hit)
	}
}

func TestCheckForwardedPortsConflict_IgnoresDisabledInboundPort(t *testing.T) {
	setupConflictDB(t)
	disabled := &model.Inbound{Tag: "vless-8080-off", Enable: false, Listen: "0.0.0.0", Port: 8080, Protocol: model.VLESS, StreamSettings: `{"network":"tcp"}`}
	if err := database.GetDB().Create(disabled).Error; err != nil {
		t.Fatalf("seed disabled inbound: %v", err)
	}

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	if hit := svc.checkForwardedPortsConflict(ctx, "8080"); hit != "" {
		t.Fatalf("a disabled inbound's port must not be reserved; got hit=%q", hit)
	}
}

func TestCheckForwardedPortsConflict_NoCollisionWhenPortsDontOverlap(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "vless-8080", "0.0.0.0", 8080, model.VLESS, `{"network":"tcp"}`, `{}`)

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	if hit := svc.checkForwardedPortsConflict(ctx, "9075-9085"); hit != "" {
		t.Fatalf("unrelated ports must not conflict; got hit=%q", hit)
	}
}

// A port-forward spec matching a port used only by an inbound hosted on a
// DIFFERENT node must not conflict: that inbound's DNAT/listen socket lives
// on the node's own host, never on this panel's, so there is nothing here
// for the forwarded port to actually collide with. Mirrors
// TestCheckPortConflict_NodeScope's own reasoning for the general port-
// conflict check.
func TestCheckForwardedPortsConflict_IgnoresPortOnDifferentNode(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflictNode(t, "node1-8080", "0.0.0.0", 8080, model.VLESS, `{"network":"tcp"}`, `{}`, new(1))

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	if hit := svc.checkForwardedPortsConflict(ctx, "8080"); hit != "" {
		t.Fatalf("a port used only on a different node must not conflict; got hit=%q", hit)
	}
}

// inboundAmneziaWGServer is pure (no DB), so it needs neither setupConflictDB
// nor CGO/sqlite -- it can run in any Go environment.
func TestInboundAmneziaWGServer_RedactsPrivateKey(t *testing.T) {
	settings := `{"server":{"privateKey":"super-secret","publicKey":"pub","mtu":1420,"headerProtectionKey":"MCPfRGcDGotJ6TcnIdDqsemj2cMIiGHnPUHM5ivXN18="},"clients":[]}`
	got := inboundAmneziaWGServer(string(model.AmneziaWG), settings)
	if got == nil {
		t.Fatal("expected a non-nil server block")
	}
	if got.PrivateKey != "" {
		t.Fatalf("PrivateKey must be redacted, got %q", got.PrivateKey)
	}
	if got.PublicKey != "pub" || got.MTU != 1420 {
		t.Fatalf("non-secret fields must still come through unchanged, got %+v", got)
	}
	// Unlike the private key, the header-protection key is shared with every
	// client config, so the clients page must receive it.
	if got.HeaderProtectionKey != "MCPfRGcDGotJ6TcnIdDqsemj2cMIiGHnPUHM5ivXN18=" {
		t.Fatalf("HeaderProtectionKey must NOT be redacted, got %q", got.HeaderProtectionKey)
	}
}

func TestNormalizeAmneziaWGSettings_GeneratesFull31Set(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{Protocol: model.AmneziaWG, Port: 51820, Settings: ""}
	if err := svc.normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("normalize empty settings: %v", err)
	}

	var parsed amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &parsed); err != nil || parsed.Server == nil {
		t.Fatalf("normalized settings must carry a server block (err=%v): %s", err, inbound.Settings)
	}
	srv := parsed.Server

	key, err := base64.StdEncoding.DecodeString(srv.HeaderProtectionKey)
	if err != nil || len(key) != 32 {
		t.Fatalf("headerProtectionKey = %q, must be base64 of 32 bytes (err=%v)", srv.HeaderProtectionKey, err)
	}
	for field, v := range map[string]string{
		"contentPaddingAddition": srv.ContentPaddingAddition,
		"rekeyAfterTime":         srv.RekeyAfterTime,
		"rekeyTimeout":           srv.RekeyTimeout,
		"rejectAfterTime":        srv.RejectAfterTime,
		"keepaliveTimeout":       srv.KeepaliveTimeout,
		"maxHandshakeAttempts":   srv.MaxHandshakeAttempts,
		"i1":                     srv.I1,
	} {
		if v == "" {
			t.Errorf("fresh server block must fill %s", field)
		}
	}
	if !srv.RandomTrailers || !srv.DisableCookies {
		t.Errorf("fresh server block defaults RandomTrailers/DisableCookies on, got %v/%v", srv.RandomTrailers, srv.DisableCookies)
	}
	if srv.I2 != "" || srv.I3 != "" || srv.I4 != "" || srv.I5 != "" {
		t.Errorf("generated sets must leave I2-I5 empty, got %q/%q/%q/%q", srv.I2, srv.I3, srv.I4, srv.I5)
	}
}

func TestNormalizeAmneziaWGSettings_RejectsBad31Values(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	cases := []struct {
		name    string
		snippet string
	}{
		{"bad headerProtectionKey", `"headerProtectionKey":"short"`},
		{"zero rekeyTimeout", `"rekeyTimeout":"0"`},
		{"S1 past what an iOS client can receive", `"s1":1553`},
		{"rekey overlapping reject", `"rekeyAfterTime":"100-200","rejectAfterTime":"150-300"`},
		{"control chars in i2", `"i2":"<r 64>\nPostUp = evil"`},
		{"line-wrapped headerProtectionKey", `"headerProtectionKey":"MCPfRGcDGotJ6Tcn\r\nIdDqsemj2cMIiGHnPUHM5ivXN18="`},
	}
	for _, c := range cases {
		inbound := &model.Inbound{
			Protocol: model.AmneziaWG,
			Port:     51820,
			Settings: `{"server":{"privateKey":"x","publicKey":"y","subnetIp":"10.8.1.0","subnetCidr":24,` + c.snippet + `},"clients":[]}`,
		}
		if err := svc.normalizeAmneziaWGSettings(inbound, nil); err == nil {
			t.Errorf("%s must be rejected", c.name)
		}
	}
}

func TestNormalizeAmneziaWGSettings_CanonicalizesRangeValues(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{
		Protocol: model.AmneziaWG,
		Port:     51820,
		Settings: `{"server":{"privateKey":"x","publicKey":"y","subnetIp":"10.8.1.0","subnetCidr":24,` +
			`"rekeyAfterTime":"110 - 140","rejectAfterTime":"190-250","keepaliveTimeout":"   "},"clients":[]}`,
	}
	if err := svc.normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("normalize: %v", err)
	}
	var parsed amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &parsed); err != nil || parsed.Server == nil {
		t.Fatalf("re-parse normalized settings (err=%v): %s", err, inbound.Settings)
	}
	if parsed.Server.RekeyAfterTime != "110-140" {
		t.Errorf("rekeyAfterTime = %q, want canonical \"110-140\"", parsed.Server.RekeyAfterTime)
	}
	// A whitespace-only value must collapse to "feature off", not be stored
	// as a value the server emitter renders into an invalid blank line.
	if parsed.Server.KeepaliveTimeout != "" {
		t.Errorf("keepaliveTimeout = %q, want collapsed to empty", parsed.Server.KeepaliveTimeout)
	}
}

func TestInboundAmneziaWGServer_NonAmneziaWGReturnsNil(t *testing.T) {
	if got := inboundAmneziaWGServer(string(model.VLESS), `{"server":{"privateKey":"x"}}`); got != nil {
		t.Fatalf("a non-AmneziaWG protocol must return nil, got %+v", got)
	}
}

func TestInboundAmneziaWGServer_MissingServerBlockReturnsNil(t *testing.T) {
	if got := inboundAmneziaWGServer(string(model.AmneziaWG), `{"clients":[]}`); got != nil {
		t.Fatalf("settings with no server block must return nil, got %+v", got)
	}
}

// A newline inside a client's allowedIPs used to reach the rendered .conf,
// where a following "[Interface]\nPostUp = ..." runs as root the moment
// whoever applies that config (client app, or awg-quick directly) does so.
func TestNormalizeAmneziaWGSettings_RejectsInjectedClientAllowedIPs(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{
		Protocol: model.AmneziaWG,
		Port:     51820,
		Settings: `{"server":{"privateKey":"x","publicKey":"y","subnetIp":"10.8.1.0","subnetCidr":24},` +
			`"clients":[{"email":"a@x","enable":true,"publicKey":"pk",` +
			`"allowedIPs":["10.8.1.2/32\n[Interface]\nPostUp = touch /tmp/pwned"]}]}`,
	}
	err := svc.normalizeAmneziaWGSettings(inbound, nil)
	if err == nil {
		t.Fatalf("an allowedIPs entry carrying a config-injection payload must be rejected; settings became:\n%s", inbound.Settings)
	}
	if !strings.Contains(err.Error(), "allowedIPs") {
		t.Errorf("error should name the offending field, got %q", err)
	}
}

// A protocol switch keeps the stored clients, re-injected after the AmneziaWG
// normalize ran, so a WireGuard row's bad allowedIPs skipped every check.
func TestUpdateInbound_ProtocolSwitchRejectsStoredClientAllowedIPs(t *testing.T) {
	setupConflictDB(t)
	stored := mkInbound(t, 51830, model.WireGuard, `{"secretKey":"`+awgTestPrivateKey+`","clients":[{"email":"sw@x","enable":true,`+
		`"privateKey":"`+awgTestPrivateKey+`","publicKey":"`+awgTestPublicKey+`","allowedIPs":["10.8.1.2/32\n[Interface]\nPostUp = touch /tmp/pwned"]}]}`)

	update := *stored
	update.Protocol = model.AmneziaWG
	update.Settings = `{"server":{"privateKey":"x","publicKey":"y","subnetIp":"10.8.1.0","subnetCidr":24},"clients":[]}`
	_, _, err := (&InboundService{}).UpdateInbound(&update)
	if err == nil || !strings.Contains(err.Error(), "invalid allowedIPs entry") {
		t.Fatalf("UpdateInbound err = %v, want an invalid allowedIPs entry error", err)
	}

	var after model.Inbound
	if err := database.GetDB().First(&after, stored.Id).Error; err != nil {
		t.Fatalf("reload: %v", err)
	}
	if after.Protocol != model.WireGuard {
		t.Fatalf("rejected switch was persisted: protocol = %q", after.Protocol)
	}
}

func TestNormalizeAmneziaWGSettings_CanonicalizesClientAllowedIPs(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{
		Protocol: model.AmneziaWG,
		Port:     51820,
		Settings: `{"server":{"privateKey":"x","publicKey":"y","subnetIp":"10.8.1.0","subnetCidr":24},` +
			`"clients":[{"email":"a@x","enable":true,"publicKey":"pk","allowedIPs":[" 10.8.1.2 "]}]}`,
	}
	if err := svc.normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("normalize: %v", err)
	}
	var parsed amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &parsed); err != nil {
		t.Fatalf("re-parse normalized settings: %v", err)
	}
	if len(parsed.Clients) != 1 || len(parsed.Clients[0].AllowedIPs) != 1 || parsed.Clients[0].AllowedIPs[0] != "10.8.1.2/32" {
		t.Fatalf("allowedIPs = %v, want [\"10.8.1.2/32\"]", parsed.Clients)
	}
}

func TestGetAmneziaWGLogs_ClampsCountAndFiltersEvents(t *testing.T) {
	// GetAmneziaWGLogs appends peer handshake activity, which reads the DB;
	// own a throwaway one so -shuffle can't leave us the global nil DB.
	setupConflictDB(t)
	logger.InitLogger(logging.DEBUG)
	logger.Info("amneziawg: started interface awg1 for inbound 1")
	logger.Info("xray: unrelated line that must never show up here")
	logger.Warning("amneziawgnet: reconcile failed for inbound 2: handshake timeout")

	svc := &ServerService{}
	logs := svc.GetAmneziaWGLogs("not-a-number", "")
	if logs == nil {
		t.Fatal("GetAmneziaWGLogs must never return nil")
	}
	for _, line := range logs.Events {
		if !strings.Contains(strings.ToLower(line), "amneziawg") {
			t.Fatalf("non-AmneziaWG line leaked into the event list: %q", line)
		}
	}
	if len(logs.Events) < 2 {
		t.Fatalf("both AmneziaWG lines should be present, got %v", logs.Events)
	}

	// count caps the event list, so an operator asking for 1 gets 1.
	if one := svc.GetAmneziaWGLogs("1", ""); len(one.Events) != 1 {
		t.Fatalf("count=1 must cap the event list, got %d", len(one.Events))
	}
	// filter narrows further, case-insensitively.
	filtered := svc.GetAmneziaWGLogs("100", "RECONCILE")
	if len(filtered.Events) != 1 || !strings.Contains(filtered.Events[0], "reconcile") {
		t.Fatalf("filter must narrow to the matching line, got %v", filtered.Events)
	}
}

func TestCheckForwardedPortsConflict_RejectsSpecOverCap(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	spec := fmt.Sprintf("20000-%d", 20000+amneziawg.MaxForwardedPorts)
	hit := svc.checkForwardedPortsConflict(ctx, spec)
	if !strings.Contains(hit, fmt.Sprintf("%d", amneziawg.MaxForwardedPorts)) {
		t.Fatalf("expected a collision naming the %d-port cap, got %q", amneziawg.MaxForwardedPorts, hit)
	}
}

// A spec covering exactly MaxForwardedPorts ports is AT the cap, not over
// it, and must be accepted -- ExpandForwardedPorts truncates there by
// design, so a naive len(...) >= cap comparison can't tell the two apart.
func TestCheckForwardedPortsConflict_AcceptsSpecExactlyAtCap(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	spec := fmt.Sprintf("20000-%d", 20000+amneziawg.MaxForwardedPorts-1)
	if hit := svc.checkForwardedPortsConflict(ctx, spec); hit != "" {
		t.Fatalf("a spec covering exactly %d ports must be accepted, got collision %q", amneziawg.MaxForwardedPorts, hit)
	}
}

// The SOCKS5 relay port an enabled AmneziaWG inbound gets (SOCKSPortForInbound)
// is a phantom, non-DB-row port -- ctx.inbounds alone can't see it, so
// checkForwardedPortsConflict must check it explicitly.
func TestCheckForwardedPortsConflict_CollidesWithAmneziawgnetSocksPort(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "awg-1", "0.0.0.0", 51820, model.AmneziaWG, ``, `{}`)

	var awgInbound model.Inbound
	if err := database.GetDB().Where("tag = ?", "awg-1").First(&awgInbound).Error; err != nil {
		t.Fatalf("read seeded row: %v", err)
	}
	relayPort := amneziawgnet.SOCKSPortForInbound(awgInbound.Id)

	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	hit := svc.checkForwardedPortsConflict(ctx, fmt.Sprintf("%d", relayPort))
	if !strings.Contains(hit, "SOCKS5") {
		t.Fatalf("expected a collision naming the AmneziaWG inbound's SOCKS5 relay port, got %q", hit)
	}
}

func TestCheckForwardedPortsConflict_KernelAmneziaWGHasNoEmbeddedRelay(t *testing.T) {
	setupConflictDB(t)
	seedInboundConflict(t, "awg-kernel", "0.0.0.0", 51820, model.AmneziaWG, ``,
		`{"server":{"privateKey":"priv","publicKey":"pub","subnetIp":"10.8.1.0","subnetCidr":24,"kernelMode":true},"clients":[]}`)

	var awgInbound model.Inbound
	if err := database.GetDB().Where("tag = ?", "awg-kernel").First(&awgInbound).Error; err != nil {
		t.Fatalf("read seeded row: %v", err)
	}
	svc := &InboundService{}
	ctx, err := svc.loadPortConflictContext(database.GetDB(), nil)
	if err != nil {
		t.Fatalf("loadPortConflictContext: %v", err)
	}
	relayPort := amneziawgnet.SOCKSPortForInbound(awgInbound.Id)
	if hit := svc.checkForwardedPortsConflict(ctx, fmt.Sprintf("%d", relayPort)); hit != "" {
		t.Fatalf("kernel-mode AmneziaWG must not reserve embedded relay port %d, got collision %q", relayPort, hit)
	}
}

// A cleared DNS field is meaningful (no DNS line in client configs) and must
// survive the save round-trip instead of resurrecting the frontend defaults.
func TestNormalizeAmneziaWGSettingsKeepsClearedDNS(t *testing.T) {
	setupConflictDB(t)
	server, err := defaultAmneziaWGServer()
	if err != nil {
		t.Fatalf("defaultAmneziaWGServer: %v", err)
	}
	server.PrimaryDNS = ""
	server.SecondaryDNS = ""
	bs, err := json.Marshal(amneziawg.InboundSettings{Server: server, Clients: []model.Client{}})
	if err != nil {
		t.Fatalf("marshal settings: %v", err)
	}
	inbound := &model.Inbound{Protocol: model.AmneziaWG, Settings: string(bs)}
	if err := (&InboundService{}).normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("normalizeAmneziaWGSettings: %v", err)
	}
	for _, key := range []string{`"primaryDns"`, `"secondaryDns"`} {
		if !strings.Contains(inbound.Settings, key) {
			t.Fatalf("cleared %s dropped from persisted settings:\n%s", key, inbound.Settings)
		}
	}
}

// An enabled peer with no address is skipped by InstanceFromInbound, and when it
// is the only one the entire inbound never starts, with nothing logged anywhere.
func TestNormalizeAmneziaWGSettings_RejectsEmptyClientAllowedIPs(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{Protocol: model.AmneziaWG, Port: 51823, Settings: `{
		"server": {"privateKey":"` + awgTestPrivateKey + `","publicKey":"` + awgTestPublicKey + `","subnetIp":"10.8.1.0","subnetCidr":24},
		"clients": [{"email":"ghost","enable":true,"publicKey":"` + awgTestPublicKey + `","allowedIPs":[]}]
	}`}
	err := svc.normalizeAmneziaWGSettings(inbound, nil)
	if err == nil || !strings.Contains(err.Error(), "allowedIPs is required") {
		t.Fatalf("err = %v, want an allowedIPs refusal naming the client", err)
	}
	if !strings.Contains(fmt.Sprint(err), "ghost") {
		t.Fatalf("error must name the offending client, got %v", err)
	}
}

// Omitting the server keys on update means "unchanged": minting a fresh pair
// invalidates every client config already distributed, with no warning.
func TestNormalizeAmneziaWGSettings_KeepsStoredServerKeysWhenOmitted(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	stored := `{"server":{"privateKey":"` + awgTestPrivateKey + `","publicKey":"` + awgTestPublicKey + `","subnetIp":"10.8.1.0","subnetCidr":24}}`

	inbound := &model.Inbound{Protocol: model.AmneziaWG, Port: 51824, Settings: `{"server":{"subnetIp":"10.8.1.0","subnetCidr":24,"randomTrailers":true}}`}
	if err := svc.normalizeAmneziaWGSettings(inbound, &model.Inbound{Settings: stored}); err != nil {
		t.Fatalf("normalize: %v", err)
	}
	var parsed amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &parsed); err != nil || parsed.Server == nil {
		t.Fatalf("normalized settings must carry a server block (err=%v): %s", err, inbound.Settings)
	}
	if parsed.Server.PrivateKey != awgTestPrivateKey || parsed.Server.PublicKey != awgTestPublicKey {
		t.Fatalf("server keypair was rotated by an unrelated edit: private=%q public=%q", parsed.Server.PrivateKey, parsed.Server.PublicKey)
	}
}

// A payload carrying only the private half used to pass straight through, so
// every rendered client config got "PublicKey = " with nothing after it.
func TestNormalizeAmneziaWGSettings_DerivesServerPublicKeyFromPrivate(t *testing.T) {
	setupConflictDB(t)
	svc := &InboundService{}
	inbound := &model.Inbound{Protocol: model.AmneziaWG, Port: 51825, Settings: `{"server":{"privateKey":"` + awgTestPrivateKey + `","subnetIp":"10.8.1.0","subnetCidr":24}}`}
	if err := svc.normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("normalize: %v", err)
	}
	var parsed amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &parsed); err != nil || parsed.Server == nil {
		t.Fatalf("normalized settings must carry a server block (err=%v): %s", err, inbound.Settings)
	}
	want, err := wgutil.PublicKeyFromPrivate(awgTestPrivateKey)
	if err != nil {
		t.Fatalf("derive expected key: %v", err)
	}
	if parsed.Server.PublicKey != want {
		t.Fatalf("server publicKey = %q, want %q derived from the supplied private key", parsed.Server.PublicKey, want)
	}
}

func TestNormalizeAmneziaWGSettingsDefersNodeKernelPreflightToRemoteHost(t *testing.T) {
	setupConflictDB(t)
	server, err := defaultAmneziaWGServer()
	if err != nil {
		t.Fatalf("defaultAmneziaWGServer: %v", err)
	}
	server.KernelMode = true
	settings, err := json.Marshal(amneziawg.InboundSettings{Server: server, Clients: []model.Client{}})
	if err != nil {
		t.Fatalf("marshal settings: %v", err)
	}
	inbound := &model.Inbound{
		Protocol: model.AmneziaWG,
		NodeID:   new(7),
		Port:     51820,
		Settings: string(settings),
	}
	if err := (&InboundService{}).normalizeAmneziaWGSettings(inbound, nil); err != nil {
		t.Fatalf("master must defer kernel readiness to the target node: %v", err)
	}
	var normalized amneziawg.InboundSettings
	if err := json.Unmarshal([]byte(inbound.Settings), &normalized); err != nil {
		t.Fatalf("decode normalized settings: %v", err)
	}
	if normalized.Server == nil || !normalized.Server.KernelMode {
		t.Fatalf("normalized node settings lost kernel mode: %+v", normalized.Server)
	}
}

// TestNormalizeAmneziaWGSettingsGatesHostReadinessOnlyWhenEnablingKernelMode:
// a host that loses its module after enabling must not lock the inbound's edits.
func TestNormalizeAmneziaWGSettingsGatesHostReadinessOnlyWhenEnablingKernelMode(t *testing.T) {
	setupConflictDB(t)
	if amneziawgkern.HostReadiness().Ready {
		t.Skip("this host can run kernel mode, so host readiness cannot refuse anything here")
	}
	server, err := defaultAmneziaWGServer()
	if err != nil {
		t.Fatalf("defaultAmneziaWGServer: %v", err)
	}
	embeddedServer := *server
	server.KernelMode = true
	kernelSettings, err := json.Marshal(amneziawg.InboundSettings{Server: server, Clients: []model.Client{}})
	if err != nil {
		t.Fatal(err)
	}
	embeddedSettings, err := json.Marshal(amneziawg.InboundSettings{Server: &embeddedServer, Clients: []model.Client{}})
	if err != nil {
		t.Fatal(err)
	}
	kernelRow := func(enable bool) *model.Inbound {
		return &model.Inbound{Protocol: model.AmneziaWG, Enable: enable, Settings: string(kernelSettings)}
	}
	cases := []struct {
		name        string
		enable      bool
		old         *model.Inbound
		wantRefused bool
	}{
		{"new inbound turns kernel mode on", true, nil, true},
		{"embedded inbound switches to kernel mode", true, &model.Inbound{Protocol: model.AmneziaWG, Enable: true, Settings: string(embeddedSettings)}, true},
		{"disabled kernel inbound is enabled", true, kernelRow(false), true},
		{"running kernel inbound is edited", true, kernelRow(true), false},
		{"running kernel inbound is disabled", false, kernelRow(true), false},
		{"disabled inbound saved with kernel mode", false, nil, false},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			inbound := &model.Inbound{Protocol: model.AmneziaWG, Port: 51820, Enable: tc.enable, Settings: string(kernelSettings)}
			err := (&InboundService{}).normalizeAmneziaWGSettings(inbound, tc.old)
			if refused := err != nil && strings.Contains(err.Error(), "kernel mode unavailable"); refused != tc.wantRefused {
				t.Fatalf("refused = %v (err %v), want %v", refused, err, tc.wantRefused)
			}
		})
	}
}

func inboundForwardedPorts(t *testing.T, inboundSvc *InboundService, ibId int, email string) string {
	t.Helper()
	ib, err := inboundSvc.GetInbound(ibId)
	if err != nil {
		t.Fatalf("GetInbound %d: %v", ibId, err)
	}
	clients, err := inboundSvc.GetClients(ib)
	if err != nil {
		t.Fatalf("GetClients %d: %v", ibId, err)
	}
	for i := range clients {
		if clients[i].Email == email {
			return clients[i].ForwardedPortsSpec()
		}
	}
	t.Fatalf("email %q not found on inbound %d", email, ibId)
	return ""
}

// seedForwardedPortsClient attaches one AmneziaWG client already holding a
// port forward, and returns its inbound and client-record id.
func seedForwardedPortsClient(t *testing.T, email, forwardedPorts string) (*model.Inbound, int) {
	t.Helper()
	svc := &ClientService{}

	seeded := model.Client{
		Email:          email,
		SubID:          "sub-" + email,
		Enable:         true,
		PublicKey:      "QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUE=",
		AllowedIPs:     []string{"10.8.1.2/32"},
		ForwardedPorts: model.ForwardedPortsPtr(forwardedPorts),
	}
	ib := mkInbound(t, 51830, model.AmneziaWG, clientsSettings(t, []model.Client{seeded}))
	if err := svc.SyncInbound(nil, ib.Id, []model.Client{seeded}); err != nil {
		t.Fatalf("seed linkage: %v", err)
	}
	return ib, lookupClientRecord(t, email).Id
}

// The client form sends "" once the field was emptied. Carried forward like an
// omitted field, the save was reported as done and the port stayed open.
func TestUpdateCanWithdrawForwardedPorts(t *testing.T) {
	setupBulkDB(t)
	inboundSvc := &InboundService{}
	svc := &ClientService{}

	ib, recId := seedForwardedPortsClient(t, "fp@x", "8022")
	if got := inboundForwardedPorts(t, inboundSvc, ib.Id, "fp@x"); got != "8022" {
		t.Fatalf("seeded forwardedPorts = %q, want 8022", got)
	}

	updated := model.Client{
		Email:          "fp@x",
		Enable:         true,
		AllowedIPs:     []string{"10.8.1.2/32"},
		ForwardedPorts: model.ForwardedPortsPtr(""),
	}
	if _, err := svc.Update(inboundSvc, recId, updated, 0); err != nil {
		t.Fatalf("Update: %v", err)
	}

	if got := inboundForwardedPorts(t, inboundSvc, ib.Id, "fp@x"); got != "" {
		t.Fatalf("inbound forwardedPorts after an explicit \"\" = %q, want none", got)
	}
	stored, err := inboundSvc.GetInbound(ib.Id)
	if err != nil {
		t.Fatalf("GetInbound: %v", err)
	}
	if strings.Contains(stored.Settings, "forwardedPorts") {
		t.Fatalf("withdrawn forwards must leave no key behind: %s", stored.Settings)
	}
	if got := lookupClientRecord(t, "fp@x").ForwardedPorts; got != "" {
		t.Fatalf("stored wg_forwarded_ports after an explicit \"\" = %q, want none", got)
	}
}

// The other half of the contract: a payload that never mentions forwardedPorts
// (a metadata-only edit from the bot or the API) leaves the stored value alone.
func TestUpdateWithoutForwardedPortsPreservesTheStoredValue(t *testing.T) {
	setupBulkDB(t)
	inboundSvc := &InboundService{}
	svc := &ClientService{}

	ib, recId := seedForwardedPortsClient(t, "fp@x", "8022")

	updated := model.Client{
		Email:      "fp@x",
		Enable:     true,
		AllowedIPs: []string{"10.8.1.2/32"},
	}
	if _, err := svc.Update(inboundSvc, recId, updated, 0); err != nil {
		t.Fatalf("Update: %v", err)
	}

	if got := inboundForwardedPorts(t, inboundSvc, ib.Id, "fp@x"); got != "8022" {
		t.Fatalf("inbound forwardedPorts after an edit that omitted it = %q, want 8022", got)
	}
	if got := lookupClientRecord(t, "fp@x").ForwardedPorts; got != "8022" {
		t.Fatalf("stored wg_forwarded_ports after an edit that omitted it = %q, want 8022", got)
	}
}

// The form is filled from the record, and the traffic resets re-save it: a record
// left at the creation-time spec moves the forward back on the next save.
func TestUpdateKeepsTheRecordsForwardedPortsCurrent(t *testing.T) {
	setupBulkDB(t)
	inboundSvc := &InboundService{}
	svc := &ClientService{}

	ib, recId := seedForwardedPortsClient(t, "fp@x", "8021")

	updated := model.Client{
		Email:          "fp@x",
		Enable:         true,
		AllowedIPs:     []string{"10.8.1.2/32"},
		ForwardedPorts: model.ForwardedPortsPtr("8022"),
	}
	if _, err := svc.Update(inboundSvc, recId, updated, 0); err != nil {
		t.Fatalf("Update: %v", err)
	}
	rec := lookupClientRecord(t, "fp@x")
	if rec.ForwardedPorts != "8022" {
		t.Fatalf("stored wg_forwarded_ports after 8021 -> 8022 = %q, want 8022", rec.ForwardedPorts)
	}

	if _, err := svc.Update(inboundSvc, recId, *rec.ToClient(), 0); err != nil {
		t.Fatalf("re-save of the record: %v", err)
	}
	if got := inboundForwardedPorts(t, inboundSvc, ib.Id, "fp@x"); got != "8022" {
		t.Fatalf("inbound forwardedPorts after a re-save of the record = %q, want 8022", got)
	}
}