/*
Copyright 2025 The KubeFleet Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package overrider

import (
	"context"
	"flag"
	"path/filepath"
	"testing"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	"k8s.io/client-go/kubernetes/scheme"
	"k8s.io/client-go/rest"
	"k8s.io/klog/v2"
	"k8s.io/klog/v2/textlogger"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/envtest"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"

	placementv1beta1 "go.goms.io/fleet/apis/placement/v1beta1"
)

var (
	cfg              *rest.Config
	mgr              manager.Manager
	k8sClient        client.Client
	testEnv          *envtest.Environment
	ctx              context.Context
	cancel           context.CancelFunc
	commonReconciler Reconciler
)

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

	RunSpecs(t, "Overrider Controller Suite")
}

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

	ctx, cancel = context.WithCancel(context.TODO())
	By("Setup klog")
	fs := flag.NewFlagSet("klog", flag.ContinueOnError)
	klog.InitFlags(fs)
	Expect(fs.Parse([]string{"--v", "5", "-add_dir_header", "true"})).Should(Succeed())

	By("bootstrapping test environment")
	testEnv = &envtest.Environment{
		CRDDirectoryPaths:     []string{filepath.Join("../../../", "config", "crd", "bases")},
		ErrorIfCRDPathMissing: true,
	}

	var err error
	cfg, err = testEnv.Start()
	Expect(err).Should(Succeed())
	Expect(cfg).NotTo(BeNil())

	err = placementv1beta1.AddToScheme(scheme.Scheme)
	Expect(err).NotTo(HaveOccurred())

	//+kubebuilder:scaffold:scheme
	By("construct the k8s client")
	k8sClient, err = client.New(cfg, client.Options{Scheme: scheme.Scheme})
	Expect(err).Should(Succeed())
	Expect(k8sClient).NotTo(BeNil())

	By("starting the controller manager")
	klog.InitFlags(flag.CommandLine)
	flag.Parse()

	mgr, err = ctrl.NewManager(cfg, ctrl.Options{
		Scheme: scheme.Scheme,
		Metrics: metricsserver.Options{
			BindAddress: "0",
		},
		Logger: textlogger.NewLogger(textlogger.NewConfig(textlogger.Verbosity(4))),
	})
	Expect(err).Should(Succeed())
	// we want to test this controller alone
	commonReconciler = Reconciler{
		Client: mgr.GetClient(),
	}
	// setup the clusterResourceReconciler
	err = (&ClusterResourceReconciler{
		Reconciler: commonReconciler,
	}).SetupWithManager(mgr)
	Expect(err).Should(Succeed())

	// setup the resourceReconciler
	err = (&ResourceReconciler{
		Reconciler: commonReconciler,
	}).SetupWithManager(mgr)
	Expect(err).Should(Succeed())

	go func() {
		defer GinkgoRecover()
		err = mgr.Start(ctx)
		Expect(err).Should(Succeed(), "failed to run manager")
	}()
})

var _ = AfterSuite(func() {
	defer klog.Flush()

	cancel()
	By("tearing down the test environment")
	err := testEnv.Stop()
	Expect(err).Should(Succeed())
})
