package v1

import (
	"context"
	"crypto/tls"
	"fmt"
	"net"
	"path/filepath"
	"testing"
	"time"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	corev1 "k8s.io/api/core/v1"

	admissionv1beta1 "k8s.io/api/admission/v1beta1"
	//+kubebuilder:scaffold:imports
	"k8s.io/apimachinery/pkg/runtime"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/envtest"
	logf "sigs.k8s.io/controller-runtime/pkg/log"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"
)

// These tests use Ginkgo (BDD-style Go testing framework). Refer to
// http://onsi.github.io/ginkgo/ to learn more about Ginkgo.

var k8sClient client.Client
var testEnv *envtest.Environment
var ctx context.Context
var cancel context.CancelFunc

func TestAPIs(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping testing in short mode")
	}
	RegisterFailHandler(Fail)

	RunSpecs(t, "Webhook Suite")
}

var _ = BeforeSuite(func() {
	logf.SetLogger(zap.New(zap.WriteTo(GinkgoWriter), zap.UseDevMode(true)))

	ctx, cancel = context.WithCancel(context.TODO())

	By("bootstrapping test environment")
	testEnv = &envtest.Environment{
		CRDDirectoryPaths:     []string{filepath.Join("..", "..", "config", "crd", "bases")},
		ErrorIfCRDPathMissing: false,
		WebhookInstallOptions: envtest.WebhookInstallOptions{
			Paths: []string{filepath.Join("..", "..", "config", "webhook", "manifests.yaml")},
		},
		ControlPlaneStopTimeout:  time.Minute * 5,
		ControlPlaneStartTimeout: time.Minute * 5,
	}

	cfg, err := testEnv.Start()
	Expect(err).NotTo(HaveOccurred())
	Expect(cfg).NotTo(BeNil())

	scheme := runtime.NewScheme()

	By("should register schemes successfully")
	err = AddToScheme(scheme)
	Expect(err).NotTo(HaveOccurred())
	err = admissionv1beta1.AddToScheme(scheme)
	Expect(err).NotTo(HaveOccurred())
	err = corev1.AddToScheme(scheme)
	Expect(err).NotTo(HaveOccurred())

	err = admissionv1beta1.AddToScheme(scheme)
	Expect(err).NotTo(HaveOccurred())

	//+kubebuilder:scaffold:scheme

	k8sClient, err = client.New(cfg, client.Options{Scheme: scheme})
	Expect(err).NotTo(HaveOccurred())
	Expect(k8sClient).NotTo(BeNil())

	// start webhook server using Manager
	webhookInstallOptions := &testEnv.WebhookInstallOptions
	mgr, err := ctrl.NewManager(cfg, ctrl.Options{
		Scheme: scheme,
		WebhookServer: webhook.NewServer(webhook.Options{
			Host:    webhookInstallOptions.LocalServingHost,
			Port:    webhookInstallOptions.LocalServingPort,
			CertDir: webhookInstallOptions.LocalServingCertDir,
		}),
		LeaderElection: false,
		Metrics: metricsserver.Options{
			BindAddress: "0",
		},
	})
	Expect(err).NotTo(HaveOccurred())

	if err := mgr.GetFieldIndexer().IndexField(context.TODO(), &Network{}, "spec.region", func(obj client.Object) []string {
		n := obj.(*Network)
		return []string{n.Spec.Region}
	}); err != nil {
		return
	}

	err = RegisterWebhooks(mgr)
	Expect(err).ToNot(HaveOccurred())

	go func() {
		err = mgr.Start(ctx)
		if err != nil {
			Expect(err).NotTo(HaveOccurred())
		}
	}()

	// wait for the webhook server to get ready
	dialer := &net.Dialer{Timeout: time.Second}
	addrPort := fmt.Sprintf("%s:%d", webhookInstallOptions.LocalServingHost, webhookInstallOptions.LocalServingPort)
	Eventually(func() error {
		// integration test codes
		/* #nosec */
		conn, err := tls.DialWithDialer(dialer, "tcp", addrPort, &tls.Config{InsecureSkipVerify: true})
		if err != nil {
			return err
		}
		conn.Close()
		return nil
	}).Should(Succeed())
})

var _ = AfterSuite(func() {
	cancel()
	By("tearing down the test environment")
	err := testEnv.Stop()
	Expect(err).NotTo(HaveOccurred())
})

type fakeReader struct {
	getFn  func(ctx context.Context, key client.ObjectKey, obj client.Object) error
	listFn func(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error
}

func (f *fakeReader) Get(ctx context.Context, key client.ObjectKey, obj client.Object, opts ...client.GetOption) error {
	if f.getFn == nil {
		return nil
	}

	return f.getFn(ctx, key, obj)
}

func (f *fakeReader) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error {
	if f.listFn == nil {
		return nil
	}

	return f.listFn(ctx, list, opts...)
}