// AI generated tests and not yet reviewed.
package controllers

import (
	"context"
	"errors"
	"sync/atomic"
	"testing"
	"time"

	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/tools/cache"
	"k8s.io/client-go/tools/record"
	"k8s.io/client-go/util/workqueue"
)

func newTestController(t *testing.T, synced cache.InformerSynced, syncHandler SyncHandler) (*Controller, workqueue.TypedRateLimitingInterface[cache.ObjectName]) {
	t.Helper()

	ratelimiter := workqueue.NewTypedItemExponentialFailureRateLimiter[cache.ObjectName](time.Millisecond, time.Second)
	q := workqueue.NewTypedRateLimitingQueue(ratelimiter)
	t.Cleanup(q.ShutDown)

	if synced == nil {
		synced = func() bool { return true }
	}

	ctrl := NewController(
		context.Background(),
		q,
		record.NewFakeRecorder(10),
		synced,
		syncHandler,
	)
	return ctrl, q
}

func TestController_processNextWorkItem_success(t *testing.T) {
	objRef := cache.ObjectName{Namespace: "default", Name: "test"}

	var syncedRef cache.ObjectName
	ctrl, q := newTestController(t, nil, func(_ context.Context, ref cache.ObjectName) error {
		syncedRef = ref
		return nil
	})
	q.Add(objRef)

	if !ctrl.processNextWorkItem(context.Background()) {
		t.Fatal("processNextWorkItem() = false, want true")
	}
	if syncedRef != objRef {
		t.Fatalf("syncHandler object = %+v, want %+v", syncedRef, objRef)
	}
	if q.Len() != 0 {
		t.Fatalf("queue length = %d, want 0 after successful sync", q.Len())
	}
	if q.NumRequeues(objRef) != 0 {
		t.Fatalf("requeues = %d, want 0 after successful sync", q.NumRequeues(objRef))
	}
}

func TestController_processNextWorkItem_syncError(t *testing.T) {
	objRef := cache.ObjectName{Namespace: "default", Name: "test"}
	syncErr := errors.New("sync failed")

	ctrl, q := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		return syncErr
	})
	q.Add(objRef)

	if !ctrl.processNextWorkItem(context.Background()) {
		t.Fatal("processNextWorkItem() = false, want true")
	}
	if q.NumRequeues(objRef) != 1 {
		t.Fatalf("requeues = %d, want 1 after sync error", q.NumRequeues(objRef))
	}
}

func TestController_processNextWorkItem_shutdown(t *testing.T) {
	ctrl, q := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		return nil
	})
	q.ShutDown()

	if ctrl.processNextWorkItem(context.Background()) {
		t.Fatal("processNextWorkItem() = true, want false on shutdown")
	}
}

func TestController_Enqueue(t *testing.T) {
	ctrl, q := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		return nil
	})

	obj := &corev1.ConfigMap{
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "default",
			Name:      "test",
		},
	}
	ctrl.Enqueue(obj)

	if q.Len() != 1 {
		t.Fatalf("queue length = %d, want 1 after Enqueue", q.Len())
	}
}

func TestController_Enqueue_invalidObject(t *testing.T) {
	ctrl, q := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		return nil
	})

	ctrl.Enqueue("not-a-kubernetes-object")

	if q.Len() != 0 {
		t.Fatalf("queue length = %d, want 0 for invalid object", q.Len())
	}
}

func TestController_Run_cacheSyncFails(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	ctrl, _ := newTestController(t, func() bool { return false }, func(context.Context, cache.ObjectName) error {
		return nil
	})

	go func() {
		time.Sleep(10 * time.Millisecond)
		cancel()
	}()

	err := ctrl.Run(ctx, 1)
	if err == nil {
		t.Fatal("Run() error = nil, want cache sync failure")
	}
}

func TestController_Run_shutsDownOnCancel(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())

	ctrl, _ := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		return nil
	})

	errCh := make(chan error, 1)
	go func() {
		errCh <- ctrl.Run(ctx, 1)
	}()

	time.Sleep(50 * time.Millisecond)
	cancel()

	select {
	case err := <-errCh:
		if err != nil {
			t.Fatalf("Run() error = %v, want nil on context cancel", err)
		}
	case <-time.After(2 * time.Second):
		t.Fatal("Run() did not return after context cancellation")
	}
}

func TestController_runWorker_processesQueuedItem(t *testing.T) {
	objRef := cache.ObjectName{Namespace: "default", Name: "test"}
	var calls atomic.Int32

	ctrl, q := newTestController(t, nil, func(context.Context, cache.ObjectName) error {
		calls.Add(1)
		return nil
	})
	q.Add(objRef)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	go ctrl.runWorker(ctx)

	deadline := time.Now().Add(2 * time.Second)
	for time.Now().Before(deadline) {
		if calls.Load() == 1 && q.Len() == 0 {
			cancel()
			return
		}
		time.Sleep(5 * time.Millisecond)
	}
	cancel()
	t.Fatalf("runWorker did not process queued item: calls=%d queueLen=%d", calls.Load(), q.Len())
}