package v1alpha1

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

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	"go.uber.org/zap/zapcore"

	certmanagerv1 "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
	monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
	admissionv1 "k8s.io/api/admission/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/utils/ptr"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/envtest"
	log "sigs.k8s.io/controller-runtime/pkg/log"
	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"

	"github.com/mariadb-operator/mariadb-operator/api/v1alpha1"
	// +kubebuilder:scaffold:imports
)

var (
	ctx           context.Context
	cancel        context.CancelFunc
	k8sClient     client.Client
	testEnv       *envtest.Environment
	testCtx       = context.Background()
	testNamespace = "default"
)

func TestAPIs(t *testing.T) {
	RegisterFailHandler(Fail)

	RunSpecs(t, "Webhook Suite")
}

var _ = BeforeSuite(func() {
	log.SetLogger(zap.New(
		zap.WriteTo(GinkgoWriter),
		zap.UseDevMode(true),
		zap.Level(zapcore.InfoLevel),
	))
	ctx, cancel = context.WithCancel(context.TODO())

	var err error
	scheme := runtime.NewScheme()
	err = v1alpha1.AddToScheme(scheme)
	Expect(err).NotTo(HaveOccurred())

	Expect(admissionv1.AddToScheme(scheme)).NotTo(HaveOccurred())
	Expect(monitoringv1.AddToScheme(scheme)).NotTo(HaveOccurred())
	Expect(certmanagerv1.AddToScheme(scheme)).NotTo(HaveOccurred())

	// +kubebuilder:scaffold:scheme

	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")},
		},
		UseExistingCluster: ptr.To(false),
	}
	// Retrieve the first found binary directory to allow running tests from IDEs
	if getFirstFoundEnvTestBinaryDir() != "" {
		testEnv.BinaryAssetsDirectory = getFirstFoundEnvTestBinaryDir()
	}
	cfg, err := testEnv.Start()
	Expect(err).NotTo(HaveOccurred())
	Expect(cfg).NotTo(BeNil())
	DeferCleanup(testEnv.Stop)

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

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

	err = SetupMariaDBWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupMaxScaleWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupBackupWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupPhysicalBackupWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupRestoreWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupConnectionWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupUserWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupGrantWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupDatabaseWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	err = SetupSqlJobWebhookWithManager(mgr)
	Expect(err).NotTo(HaveOccurred())

	// +kubebuilder:scaffold:webhook

	go func() {
		defer GinkgoRecover()
		err = mgr.Start(ctx)
		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 {
		conn, err := tls.DialWithDialer(dialer, "tcp", addrPort, &tls.Config{InsecureSkipVerify: true})
		if err != nil {
			return err
		}

		return conn.Close()
	}).Should(Succeed())
})

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

// getFirstFoundEnvTestBinaryDir locates the first binary in the specified path.
// ENVTEST-based tests depend on specific binaries, usually located in paths set by
// controller-runtime. When running tests directly (e.g., via an IDE) without using
// Makefile targets, the 'BinaryAssetsDirectory' must be explicitly configured.
//
// This function streamlines the process by finding the required binaries, similar to
// setting the 'KUBEBUILDER_ASSETS' environment variable. To ensure the binaries are
// properly set up, run 'make setup-envtest' beforehand.
func getFirstFoundEnvTestBinaryDir() string {
	basePath := filepath.Join("..", "..", "..", "bin", "k8s")
	entries, err := os.ReadDir(basePath)
	if err != nil {
		logf.Log.Error(err, "Failed to read directory", "path", basePath)
		return ""
	}
	for _, entry := range entries {
		if entry.IsDir() {
			return filepath.Join(basePath, entry.Name())
		}
	}
	return ""
}