package utils

import (
	"context"
	"errors"
	"reflect"
	"testing"
	"time"

	"go.uber.org/zap"
	"go.uber.org/zap/zaptest/observer"
	corev1 "k8s.io/api/core/v1"
	k8sfake "k8s.io/client-go/kubernetes/fake"
	k8sCache "k8s.io/client-go/tools/cache"

	managerPkg "github.com/fission/fission/pkg/utils/manager"
)

type testNamespaceSubscriber struct {
	name        string
	addErr      error
	removeErr   error
	resyncErr   error
	addCalls    int
	removeCalls int
	resyncCalls int
}

func (s *testNamespaceSubscriber) Name() string {
	return s.name
}

func (s *testNamespaceSubscriber) OnNamespaceAdd(ctx context.Context, record NamespaceRecord) error {
	s.addCalls++
	return s.addErr
}

func (s *testNamespaceSubscriber) OnNamespaceRemove(ctx context.Context, record NamespaceRecord) error {
	s.removeCalls++
	return s.removeErr
}

func (s *testNamespaceSubscriber) OnNamespaceResync(ctx context.Context, record NamespaceRecord) error {
	s.resyncCalls++
	return s.resyncErr
}

func TestNamespaceManagerSnapshotAndGet(t *testing.T) {
	manager := NewNamespaceManager()
	now := time.Now().UTC()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-b", Source: NamespaceSourceWatcher, ObservedAt: now})
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher, ObservedAt: now})

	expected := []string{"tenant-a", "tenant-b"}
	if !reflect.DeepEqual(expected, manager.Snapshot()) {
		t.Fatalf("expected snapshot %v, got %v", expected, manager.Snapshot())
	}

	record, ok := manager.Get("tenant-a")
	if !ok {
		t.Fatalf("expected tenant-a to exist")
	}
	if record.Name != "tenant-a" || record.Phase != NamespacePhaseDiscovered {
		t.Fatalf("unexpected record returned: %+v", record)
	}
	summary := manager.Summary()
	if summary.TotalNamespaces != 2 {
		t.Fatalf("expected summary total namespaces to be 2, got %d", summary.TotalNamespaces)
	}
	if summary.LiveNamespaces != 2 {
		t.Fatalf("expected live namespaces to be 2, got %d", summary.LiveNamespaces)
	}
	if summary.SourceCounts[NamespaceSourceWatcher] != 2 {
		t.Fatalf("expected watcher source count to be 2")
	}
}

func TestNamespaceManagerUpsertIncrementsGeneration(t *testing.T) {
	manager := NewNamespaceManager()
	now := time.Now().UTC()

	first := manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher, ObservedAt: now})
	second := manager.Upsert(NamespaceEvent{Type: NamespaceEventUpdate, Name: "tenant-a", Source: NamespaceSourceWatcher, ObservedAt: now.Add(time.Second)})

	if first.Generation != 1 {
		t.Fatalf("expected first generation to be 1, got %d", first.Generation)
	}
	if second.Generation != 2 {
		t.Fatalf("expected second generation to be 2, got %d", second.Generation)
	}
}

func TestNamespaceManagerMarkPartState(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	record, ok := manager.MarkPartState("tenant-a", "router", NamespacePartState{State: NamespacePartStateActive})
	if !ok {
		t.Fatalf("expected mark part state to succeed")
	}
	if record.RegisteredParts["router"].State != NamespacePartStateActive {
		t.Fatalf("expected router part state to be stored")
	}
	if record.Phase != NamespacePhaseActive {
		t.Fatalf("expected phase to become active, got %s", record.Phase)
	}
}

func TestNamespaceManagerRemove(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	if !manager.Remove("tenant-a") {
		t.Fatalf("expected remove to succeed")
	}
	if _, ok := manager.Get("tenant-a"); ok {
		t.Fatalf("expected record to be removed")
	}
	if manager.Remove("tenant-a") {
		t.Fatalf("expected second remove to report false")
	}
}

func TestNamespaceManagerSnapshotRecordsReturnsCopies(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{
		Type:   NamespaceEventAdd,
		Name:   "tenant-a",
		Source: NamespaceSourceWatcher,
		Labels: map[string]string{"fission.io/managed": "true"},
	})
	_, _ = manager.MarkPartState("tenant-a", "router", NamespacePartState{State: NamespacePartStateActive})

	records := manager.SnapshotRecords()
	records[0].Labels["fission.io/managed"] = "false"
	records[0].RegisteredParts["router"] = NamespacePartState{State: "failed"}

	record, ok := manager.Get("tenant-a")
	if !ok {
		t.Fatalf("expected tenant-a to exist")
	}
	if record.Labels["fission.io/managed"] != "true" {
		t.Fatalf("expected snapshot records to be detached copies")
	}
	if record.RegisteredParts["router"].State != NamespacePartStateActive {
		t.Fatalf("expected part states to be detached copies")
	}
}

func TestNamespaceManagerSubscribers(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Subscribe(&testNamespaceSubscriber{name: "router"})
	manager.Subscribe(&testNamespaceSubscriber{name: "buildermgr"})
	manager.Subscribe(&testNamespaceSubscriber{name: "router"})

	expected := []string{"buildermgr", "router"}
	if !reflect.DeepEqual(expected, manager.SnapshotSubscribers()) {
		t.Fatalf("expected subscribers %v, got %v", expected, manager.SnapshotSubscribers())
	}
}

func TestNamespaceManagerMarkPartStateDerivesPhase(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	record, ok := manager.MarkPartState("tenant-a", "router", NamespacePartState{State: NamespacePartStateRegistering})
	if !ok {
		t.Fatalf("expected registering state update to succeed")
	}
	if record.Phase != NamespacePhaseRegistering {
		t.Fatalf("expected phase registering, got %s", record.Phase)
	}

	record, ok = manager.MarkPartState("tenant-a", "router", NamespacePartState{State: NamespacePartStateFailed})
	if !ok {
		t.Fatalf("expected failed state update to succeed")
	}
	if record.Phase != NamespacePhaseFailed {
		t.Fatalf("expected phase failed, got %s", record.Phase)
	}
}

func TestNamespaceManagerBootstrap(t *testing.T) {
	manager := NewNamespaceManager()
	now := time.Now().UTC()
	records := manager.Bootstrap([]string{"tenant-b", "tenant-a"}, NamespaceSourceBackfill, now)

	if len(records) != 2 {
		t.Fatalf("expected 2 bootstrap records, got %d", len(records))
	}
	if !reflect.DeepEqual([]string{"tenant-a", "tenant-b"}, manager.Snapshot()) {
		t.Fatalf("expected manager snapshot to contain bootstrapped namespaces")
	}
	record, ok := manager.Get("tenant-a")
	if !ok {
		t.Fatalf("expected tenant-a after bootstrap")
	}
	if record.Source != NamespaceSourceBackfill {
		t.Fatalf("expected bootstrap source backfill, got %s", record.Source)
	}
}

func TestNamespaceManagerBootstrapAndDispatch(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	records, err := manager.BootstrapAndDispatch(context.Background(), []string{"tenant-b", "tenant-a"}, NamespaceSourceBackfill, time.Now().UTC())
	if err != nil {
		t.Fatalf("expected bootstrap and dispatch success: %v", err)
	}
	if len(records) != 2 {
		t.Fatalf("expected 2 records, got %d", len(records))
	}
	if router.addCalls != 2 || builder.addCalls != 2 {
		t.Fatalf("expected both subscribers to be called for each namespace")
	}
	if records[0].Phase != NamespacePhaseActive || records[1].Phase != NamespacePhaseActive {
		t.Fatalf("expected active records after bootstrap dispatch")
	}
}

func TestNamespaceManagerBootstrapAndDispatchFailure(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router", addErr: errors.New("router failed")}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	records, err := manager.BootstrapAndDispatch(context.Background(), []string{"tenant-a"}, NamespaceSourceBackfill, time.Now().UTC())
	if err == nil {
		t.Fatalf("expected bootstrap dispatch failure")
	}
	if len(records) != 1 {
		t.Fatalf("expected single record result")
	}
	if records[0].Phase != NamespacePhaseFailed {
		t.Fatalf("expected failed phase after subscriber error, got %s", records[0].Phase)
	}
	if records[0].RegisteredParts["router"].LastError != "router failed" {
		t.Fatalf("expected router failure to be stored")
	}
}

func TestNamespaceManagerPartStateHelpers(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	record, ok := manager.MarkPartRegistering("tenant-a", "router")
	if !ok || record.Phase != NamespacePhaseRegistering {
		t.Fatalf("expected registering helper to set registering phase")
	}

	record, ok = manager.MarkPartActive("tenant-a", "router")
	if !ok || record.Phase != NamespacePhaseActive {
		t.Fatalf("expected active helper to set active phase")
	}

	record, ok = manager.MarkPartFailed("tenant-a", "router", errors.New("boom"))
	if !ok || record.Phase != NamespacePhaseFailed {
		t.Fatalf("expected failed helper to set failed phase")
	}
	if record.RegisteredParts["router"].LastError != "boom" {
		t.Fatalf("expected failed helper to persist error")
	}
}

func TestNewBootstrappedNamespaceManager(t *testing.T) {
	resolver := &NamespaceResolver{
		FissionResourceNS: map[string]string{
			"tenant-b": "tenant-b",
			"tenant-a": "tenant-a",
		},
	}

	manager := NewBootstrappedNamespaceManager(resolver, NamespaceSourceEnv, time.Now().UTC())
	if !reflect.DeepEqual([]string{"tenant-a", "tenant-b"}, manager.Snapshot()) {
		t.Fatalf("expected bootstrapped manager snapshot from resolver")
	}
	record, ok := manager.Get("tenant-a")
	if !ok {
		t.Fatalf("expected tenant-a in bootstrapped manager")
	}
	if record.Source != NamespaceSourceEnv {
		t.Fatalf("expected env source, got %s", record.Source)
	}
}

func TestNewWatcherNamespaceManager(t *testing.T) {
	router := &testNamespaceSubscriber{name: "router"}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager, err := NewWatcherNamespaceManager(context.Background(), []string{"tenant-b", "tenant-a"}, NamespaceSourceEnv, time.Now().UTC(), router, builder)
	if err != nil {
		t.Fatalf("expected watcher manager bootstrap success: %v", err)
	}
	if !reflect.DeepEqual([]string{"tenant-a", "tenant-b"}, manager.Snapshot()) {
		t.Fatalf("expected watcher manager snapshot to match bootstrapped namespaces")
	}
	if router.addCalls != 2 || builder.addCalls != 2 {
		t.Fatalf("expected all subscribers to receive bootstrap dispatch calls")
	}
}

func TestNamespaceBecameUnmanaged(t *testing.T) {
	oldNamespace := &corev1.Namespace{}
	oldNamespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
	newNamespace := &corev1.Namespace{}
	newNamespace.Labels = map[string]string{}

	if !NamespaceBecameUnmanaged(oldNamespace, newNamespace) {
		t.Fatalf("expected namespace to become unmanaged")
	}
	if NamespaceBecameUnmanaged(nil, newNamespace) {
		t.Fatalf("expected nil old namespace to report false")
	}
}

func TestDispatchNamespaceAddAndResync(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}

	record, ok, err := DispatchNamespaceAdd(context.Background(), manager, namespace, NamespaceSourceWatcher, time.Now().UTC())
	if !ok || err != nil || record.Phase != NamespacePhaseActive {
		t.Fatalf("expected add dispatch success, ok=%v err=%v phase=%s", ok, err, record.Phase)
	}
	record, ok, err = DispatchNamespaceResync(context.Background(), manager, namespace, NamespaceSourceWatcher, time.Now().UTC())
	if !ok || err != nil || record.Phase != NamespacePhaseActive {
		t.Fatalf("expected resync dispatch success, ok=%v err=%v phase=%s", ok, err, record.Phase)
	}
	if router.addCalls != 1 || router.resyncCalls != 1 {
		t.Fatalf("expected add and resync subscriber calls")
	}
}

func TestRecordNamespaceRemoval(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	record, ok := RecordNamespaceRemoval(manager, k8sCache.DeletedFinalStateUnknown{Obj: namespace}, NamespaceSourceWatcher, time.Now().UTC())
	if !ok {
		t.Fatalf("expected removal bookkeeping to succeed")
	}
	if record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected removed phase after bookkeeping, got %s", record.Phase)
	}
}

func TestHandleWatcherNamespaceAddUpdateDelete(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	logger := zap.NewNop()
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}

	HandleWatcherNamespaceAdd(context.Background(), logger, "router.NSWatcher", manager, namespace)
	if router.addCalls != 1 {
		t.Fatalf("expected add handler to dispatch add")
	}

	HandleWatcherNamespaceUpdate(context.Background(), logger, "router.NSWatcher", manager, namespace, namespace, NamespaceRemovalStrategyTrackOnly)
	if router.resyncCalls != 1 {
		t.Fatalf("expected update handler to dispatch resync")
	}

	HandleWatcherNamespaceDelete(context.Background(), logger, "router.NSWatcher", manager, k8sCache.DeletedFinalStateUnknown{Obj: namespace}, NamespaceRemovalStrategyTrackOnly)
	record, ok := manager.Get("tenant-a")
	if !ok || record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected delete handler to mark namespace removed")
	}
}

func TestHandleWatcherNamespaceAddLogsSummary(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	core, logs := observer.New(zap.InfoLevel)
	logger := zap.New(core)
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}

	HandleWatcherNamespaceAdd(context.Background(), logger, "router.NSWatcher", manager, namespace)

	entries := logs.AllUntimed()
	if len(entries) != 1 {
		t.Fatalf("expected one summary log entry, got %d", len(entries))
	}
	if entries[0].Message != "router.NSWatcher: namespace manager summary" {
		t.Fatalf("unexpected log message: %s", entries[0].Message)
	}
	fields := entries[0].ContextMap()
	active, ok := fields["has_active_namespaces"].(bool)
	if !ok || !active {
		t.Fatalf("expected summary log to report active namespaces")
	}
	if live, ok := fields["live_namespaces"].(int64); !ok || live != 1 {
		t.Fatalf("expected summary log to report one live namespace, got %v", fields["live_namespaces"])
	}
}

func TestHandleWatcherNamespaceRemovalDispatch(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	logger := zap.NewNop()
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	HandleWatcherNamespaceRemoval(context.Background(), logger, "router.NSWatcher", manager, namespace, NamespaceRemovalStrategyDispatchRemove)
	record, ok := manager.Get("tenant-a")
	if !ok || record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected dispatch removal to keep removed record")
	}
	if router.removeCalls != 1 {
		t.Fatalf("expected remove subscriber to be called once")
	}
}

func TestHandleWatcherNamespaceUpdateDispatchRemoval(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	logger := zap.NewNop()
	oldNamespace := &corev1.Namespace{}
	oldNamespace.Name = "tenant-a"
	oldNamespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
	newNamespace := &corev1.Namespace{}
	newNamespace.Name = "tenant-a"
	newNamespace.Labels = map[string]string{}
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})

	HandleWatcherNamespaceUpdate(context.Background(), logger, "router.NSWatcher", manager, oldNamespace, newNamespace, NamespaceRemovalStrategyDispatchRemove)
	record, ok := manager.Get("tenant-a")
	if !ok || record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected dispatch removal on managed->unmanaged transition")
	}
	if router.removeCalls != 1 {
		t.Fatalf("expected remove subscriber to be called once on label drop")
	}
}

func TestNewNamespaceWatcherEventHandlers(t *testing.T) {
	manager := NewNamespaceManager()
	router := &testNamespaceSubscriber{name: "router"}
	manager.Subscribe(router)
	logger := zap.NewNop()
	handlers := NewNamespaceWatcherEventHandlers(context.Background(), logger, "router.NSWatcher", manager, NamespaceRemovalStrategyTrackOnly)
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}

	handlers.AddFunc(namespace)
	handlers.UpdateFunc(namespace, namespace)
	handlers.DeleteFunc(k8sCache.DeletedFinalStateUnknown{Obj: namespace})

	record, ok := manager.Get("tenant-a")
	if !ok || record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected watcher event handlers to drive namespace lifecycle")
	}
	if router.addCalls != 1 || router.resyncCalls != 1 {
		t.Fatalf("expected add and resync calls through event handlers")
	}
}

func TestPrepareManagedNamespaceWatcher(t *testing.T) {
	router := &testNamespaceSubscriber{name: "router"}
	logger := zap.NewNop()
	manager, handlers, err := PrepareManagedNamespaceWatcher(context.Background(), logger, ManagedNamespaceWatcherConfig{
		Component:       "router.NSWatcher",
		Namespaces:      []string{"tenant-a"},
		RemovalStrategy: NamespaceRemovalStrategyTrackOnly,
		Subscriber:      router,
	})
	if err != nil {
		t.Fatalf("expected watcher preparation success: %v", err)
	}
	if !reflect.DeepEqual([]string{"tenant-a"}, manager.Snapshot()) {
		t.Fatalf("expected watcher manager snapshot to contain bootstrapped namespace")
	}
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
	handlers.UpdateFunc(namespace, namespace)
	if router.addCalls != 1 || router.resyncCalls != 1 {
		t.Fatalf("expected bootstrap add and handler resync calls")
	}
}

func TestRunManagedNamespaceWatcher(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	router := &testNamespaceSubscriber{name: "router"}
	logger := zap.NewNop()
	manager, err := RunManagedNamespaceWatcher(ctx, logger, k8sfake.NewSimpleClientset(), managerPkg.New(), ManagedNamespaceWatcherConfig{
		Component:       "router.NSWatcher",
		Namespaces:      []string{"tenant-a"},
		RemovalStrategy: NamespaceRemovalStrategyTrackOnly,
		Subscriber:      router,
	})
	if err != nil {
		t.Fatalf("expected managed namespace watcher run success: %v", err)
	}
	if !reflect.DeepEqual([]string{"tenant-a"}, manager.Snapshot()) {
		t.Fatalf("expected watcher manager snapshot to contain bootstrapped namespace")
	}
}

func TestRunManagedNamespaceWatcherLogsStartedSummary(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	router := &testNamespaceSubscriber{name: "router"}
	core, logs := observer.New(zap.InfoLevel)
	logger := zap.New(core)

	_, err := RunManagedNamespaceWatcher(ctx, logger, k8sfake.NewSimpleClientset(), managerPkg.New(), ManagedNamespaceWatcherConfig{
		Component:       "router.NSWatcher",
		Namespaces:      []string{"tenant-a"},
		RemovalStrategy: NamespaceRemovalStrategyTrackOnly,
		Subscriber:      router,
	})
	if err != nil {
		t.Fatalf("expected managed namespace watcher run success: %v", err)
	}

	entries := logs.FilterMessage("router.NSWatcher: started namespace watcher").AllUntimed()
	if len(entries) != 1 {
		t.Fatalf("expected one started-summary log entry, got %d", len(entries))
	}
	fields := entries[0].ContextMap()
	if live, ok := fields["live_namespaces"].(int64); !ok || live != 1 {
		t.Fatalf("expected started summary to report one live namespace, got %v", fields["live_namespaces"])
	}
	if active, ok := fields["has_active_namespaces"].(bool); !ok || !active {
		t.Fatalf("expected started summary to report active namespaces")
	}
	if total, ok := fields["total_namespaces"].(int64); !ok || total != 1 {
		t.Fatalf("expected started summary to report one total namespace, got %v", fields["total_namespaces"])
	}
	if got := fields["subscribers"]; got == nil || !reflect.DeepEqual(got, []interface{}{"router"}) && !reflect.DeepEqual(got, []string{"router"}) {
		t.Fatalf("expected started summary to report router subscriber, got %v", got)
	}
	if got := fields["phase_counts"]; got == nil {
		t.Fatalf("expected started summary to report phase counts")
	}
}

func TestNewDefaultManagedNamespaceWatcherConfig(t *testing.T) {
	resolver := DefaultNSResolver()
	original := resolver.FissionResourceNS
	resolver.FissionResourceNS = map[string]string{"tenant-a": "tenant-a"}
	defer func() {
		resolver.FissionResourceNS = original
	}()

	router := &testNamespaceSubscriber{name: "router"}
	config := NewDefaultManagedNamespaceWatcherConfig("router.NSWatcher", router)
	if config.Component != "router.NSWatcher" {
		t.Fatalf("expected component name to be preserved")
	}
	if config.RemovalStrategy != NamespaceRemovalStrategyTrackOnly {
		t.Fatalf("expected default removal strategy track-only")
	}
	if !reflect.DeepEqual([]string{"tenant-a"}, config.Namespaces) {
		t.Fatalf("expected namespaces from resolver snapshot")
	}
	if config.Subscriber != router {
		t.Fatalf("expected subscriber to be preserved")
	}
}

func TestPrepareManagedNamespaceWatcherDefaultsToTrackOnly(t *testing.T) {
	router := &testNamespaceSubscriber{name: "router"}
	logger := zap.NewNop()
	manager, handlers, err := PrepareManagedNamespaceWatcher(context.Background(), logger, ManagedNamespaceWatcherConfig{
		Component:  "router.NSWatcher",
		Namespaces: []string{"tenant-a"},
		Subscriber: router,
	})
	if err != nil {
		t.Fatalf("expected watcher preparation success: %v", err)
	}
	namespace := &corev1.Namespace{}
	namespace.Name = "tenant-a"
	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
	handlers.DeleteFunc(k8sCache.DeletedFinalStateUnknown{Obj: namespace})
	record, ok := manager.Get("tenant-a")
	if !ok || record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected default strategy to keep track-only removal semantics")
	}
	if router.removeCalls != 0 {
		t.Fatalf("expected default strategy not to dispatch remove")
	}
}

func TestNamespaceManagerSummary(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-b", Source: NamespaceSourceWatcher})
	_, _ = manager.MarkPartRegistering("tenant-a", "router")
	manager.Upsert(NamespaceEvent{Type: NamespaceEventRemove, Name: "tenant-b", Source: NamespaceSourceWatcher})
	manager.Subscribe(&testNamespaceSubscriber{name: "router"})

	summary := manager.Summary()
	if summary.TotalNamespaces != 2 {
		t.Fatalf("expected total namespaces 2, got %d", summary.TotalNamespaces)
	}
	if summary.LiveNamespaces != 1 {
		t.Fatalf("expected one live namespace, got %d", summary.LiveNamespaces)
	}
	if summary.PhaseCounts[NamespacePhaseRegistering] != 1 {
		t.Fatalf("expected one registering namespace")
	}
	if summary.PhaseCounts[NamespacePhaseRemoved] != 1 {
		t.Fatalf("expected one removed namespace")
	}
	if !reflect.DeepEqual([]string{"router"}, summary.Subscribers) {
		t.Fatalf("expected router subscriber in summary")
	}
	if summary.SourceCounts[NamespaceSourceWatcher] != 2 {
		t.Fatalf("expected two watcher-sourced namespaces")
	}
}

func TestLogNamespaceManagerSummary(t *testing.T) {
	LogNamespaceManagerSummary(nil, "ignored", NamespaceManagerSummary{})

	logger := zap.NewNop()
	summary := NamespaceManagerSummary{
		TotalNamespaces: 2,
		LiveNamespaces:  1,
		PhaseCounts: map[NamespacePhase]int{
			NamespacePhaseActive:  1,
			NamespacePhaseRemoved: 1,
		},
		SourceCounts: map[NamespaceSource]int{
			NamespaceSourceWatcher: 1,
			NamespaceSourceEnv:     1,
		},
		Subscribers: []string{"router", "buildermgr"},
	}

	LogNamespaceManagerSummary(logger, "namespace summary", summary)
}

func TestLogNamespaceManagerSummaryIncludesHasActiveNamespaces(t *testing.T) {
	core, logs := observer.New(zap.InfoLevel)
	logger := zap.New(core)

	LogNamespaceManagerSummary(logger, "namespace summary", NamespaceManagerSummary{
		LiveNamespaces: 1,
		PhaseCounts:    map[NamespacePhase]int{},
		SourceCounts:   map[NamespaceSource]int{},
		Subscribers:    []string{},
	})

	entries := logs.AllUntimed()
	if len(entries) != 1 {
		t.Fatalf("expected one log entry, got %d", len(entries))
	}
	fields := entries[0].ContextMap()
	active, ok := fields["has_active_namespaces"].(bool)
	if !ok {
		t.Fatalf("expected has_active_namespaces field in log context")
	}
	if !active {
		t.Fatalf("expected has_active_namespaces=true in log context")
	}
}

func TestNamespaceManagerSummaryEmptyContract(t *testing.T) {
	manager := NewNamespaceManager()
	summary := manager.Summary()
	if summary.PhaseCounts == nil {
		t.Fatalf("expected phase counts map to be initialized")
	}
	if summary.SourceCounts == nil {
		t.Fatalf("expected source counts map to be initialized")
	}
	if summary.Subscribers == nil {
		t.Fatalf("expected subscribers slice to be initialized")
	}
	if len(summary.Subscribers) != 0 {
		t.Fatalf("expected no subscribers in empty summary")
	}
}
func TestLogNamespaceManagerSummaryWithNilLogger(t *testing.T) {
	LogNamespaceManagerSummary(nil, "ignored", NamespaceManagerSummary{TotalNamespaces: 1})
}

func TestNamespaceManagerDispatchAdd(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	router := &testNamespaceSubscriber{name: "router"}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	record, ok, err := manager.DispatchAdd(context.Background(), "tenant-a")
	if !ok || err != nil {
		t.Fatalf("expected dispatch add success, ok=%v err=%v", ok, err)
	}
	if router.addCalls != 1 || builder.addCalls != 1 {
		t.Fatalf("expected both subscribers to receive add call")
	}
	if record.Phase != NamespacePhaseActive {
		t.Fatalf("expected active phase after successful dispatch, got %s", record.Phase)
	}
}

func TestNamespaceManagerDispatchResyncFailure(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	router := &testNamespaceSubscriber{name: "router"}
	builder := &testNamespaceSubscriber{name: "buildermgr", resyncErr: errors.New("resync failed")}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	record, ok, err := manager.DispatchResync(context.Background(), "tenant-a")
	if !ok || err == nil {
		t.Fatalf("expected dispatch resync failure, ok=%v err=%v", ok, err)
	}
	if builder.resyncCalls != 1 {
		t.Fatalf("expected failing subscriber to receive resync call")
	}
	if record.Phase != NamespacePhaseFailed {
		t.Fatalf("expected failed phase after dispatch error, got %s", record.Phase)
	}
	if record.RegisteredParts["buildermgr"].LastError != "resync failed" {
		t.Fatalf("expected subscriber error to be stored")
	}
}

func TestNamespaceManagerDispatchRemove(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	router := &testNamespaceSubscriber{name: "router"}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	record, ok, err := manager.DispatchRemove(context.Background(), "tenant-a")
	if !ok || err != nil {
		t.Fatalf("expected dispatch remove success, ok=%v err=%v", ok, err)
	}
	if router.removeCalls != 1 || builder.removeCalls != 1 {
		t.Fatalf("expected both subscribers to receive remove call")
	}
	if record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected removed phase after dispatch remove, got %s", record.Phase)
	}
}

func TestNamespaceManagerDispatchRemoveFailure(t *testing.T) {
	manager := NewNamespaceManager()
	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
	router := &testNamespaceSubscriber{name: "router", removeErr: errors.New("remove failed")}
	builder := &testNamespaceSubscriber{name: "buildermgr"}
	manager.Subscribe(router)
	manager.Subscribe(builder)

	record, ok, err := manager.DispatchRemove(context.Background(), "tenant-a")
	if !ok || err == nil {
		t.Fatalf("expected dispatch remove failure, ok=%v err=%v", ok, err)
	}
	if record.Phase != NamespacePhaseRemoved {
		t.Fatalf("expected removed phase even on dispatch remove error, got %s", record.Phase)
	}
}

func TestNamespaceSubscriberFuncs(t *testing.T) {
	addCalls := 0
	removeCalls := 0
	resyncCalls := 0
	subscriber := NamespaceSubscriberFuncs{
		SubscriberName: "router",
		AddFunc: func(ctx context.Context, record NamespaceRecord) error {
			addCalls++
			return nil
		},
		RemoveFunc: func(ctx context.Context, record NamespaceRecord) error {
			removeCalls++
			return nil
		},
		ResyncFunc: func(ctx context.Context, record NamespaceRecord) error {
			resyncCalls++
			return nil
		},
	}

	if subscriber.Name() != "router" {
		t.Fatalf("expected subscriber name router")
	}
	_ = subscriber.OnNamespaceAdd(context.Background(), NamespaceRecord{Name: "tenant-a"})
	_ = subscriber.OnNamespaceRemove(context.Background(), NamespaceRecord{Name: "tenant-a"})
	_ = subscriber.OnNamespaceResync(context.Background(), NamespaceRecord{Name: "tenant-a"})

	if addCalls != 1 || removeCalls != 1 || resyncCalls != 1 {
		t.Fatalf("expected all functional callbacks to run once")
	}
}