/*
Copyright 2021.

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 network

import (
	"context"
	"fmt"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	"sigs.k8s.io/aws-iam-authenticator/pkg/token"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/builder"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/predicate"

	"github.com/crossplane/provider-aws/apis/v1beta1"
	"github.com/go-logr/logr"
	"github.com/tidbcloud/eks-provider/api/v1alpha1"
	"github.com/tidbcloud/eks-provider/controllers/network/task"
	"github.com/tidbcloud/eks-provider/pkg/config"
	"github.com/tidbcloud/eks-provider/pkg/deploy"
	"github.com/tidbcloud/eks-provider/pkg/k8s"
	cloudv1 "github.com/tidbcloud/infra-api/api/v1"
)

const (
	ProviderTypeEKS = "eks"
)

// NetworkReconciler reconciles a Network object
type NetworkReconciler struct {
	Logger logr.Logger

	client.Client
	TokenGen token.Generator
	Cache    client.Reader
	Scheme   *runtime.Scheme
	Config   config.RootConfig
}

//+kubebuilder:rbac:groups=cloud.pingcap.com,resources=networks,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=cloud.pingcap.com,resources=networks/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=cloud.pingcap.com,resources=networks/finalizers,verbs=update

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
func (r *NetworkReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	var network cloudv1.Network
	r.Logger.Info("Reconciling Network", "namespace", req.Namespace, "name", req.Name)
	if err := r.Cache.Get(ctx, req.NamespacedName, &network); err != nil {
		if apierrors.IsNotFound(err) {
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, fmt.Errorf("unable to get network %s: %v", req.NamespacedName, err)
	}

	providerType := network.Spec.Provider
	if providerType != ProviderTypeEKS {
		return ctrl.Result{}, nil
	}

	var provider cloudv1.Provider
	err := r.Cache.Get(ctx, types.NamespacedName{Name: providerType}, &provider)
	if err != nil {
		if apierrors.IsNotFound(err) {
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, fmt.Errorf("unable to get provider %s: %v", providerType, err)
	}
	providerSpec, err := v1alpha1.EKSProviderSpecForProvider(&provider)
	if err != nil {
		return ctrl.Result{}, fmt.Errorf("unable to get provider spec %s: %v", providerType, err)
	}

	networkSpec, err := v1alpha1.EKSNetworkSpecForNetwork(&network)
	if err != nil {
		return ctrl.Result{}, fmt.Errorf("unable to get network spec: %v", err)
	}

	c := &task.Context{
		Config:       r.Config,
		ProviderSpec: providerSpec,
		Local:        k8s.NewMutClientWithOwner(r.Client, network.DeepCopy()),
		Network:      &network,
		NetworkSpec:  networkSpec,
	}

	tasks := []deploy.Task{
		task.NewSyncPhase(c),
		task.NewFinalizer(c),
		task.NewProviderConfig(c),
		task.NewPolicyGrant(c),
		task.NewEKS(c),
		task.NewConnection(c, r.TokenGen),
		task.NewNamespace(c),
		task.NewNodegroup(c),
		task.NewCSI(c),
		task.NewStorageClass(c),
		task.NewCertManager(c),
		task.NewPCAIssuer(c),
		task.NewOperator(c),
		task.NewProxy(c),
		// task.NewWebhook(c),
		// task.NewReporter(c),
	}

	d := deploy.NewDeployer(
		tasks,
		[]deploy.Task{task.NewSyncPhase(c), task.NewReset(c)}, // pre-start tasks
		[]deploy.Task{task.NewUpdateStatus(c)},                // post-stop tasks
		r.Logger,
	)

	if network.DeletionTimestamp.IsZero() {
		return d.Deploy(ctx)
	}
	return d.Destroy(ctx)
}

// SetupWithManager sets up the controller with the Manager.
func (r *NetworkReconciler) SetupWithManager(mgr ctrl.Manager, pd predicate.Predicate) error {
	p, err := predicate.LabelSelectorPredicate(metav1.LabelSelector{
		MatchLabels: map[string]string{
			cloudv1.ProviderTypeLabel: ProviderTypeEKS,
		},
	})
	if err != nil {
		return err
	}

	return ctrl.NewControllerManagedBy(mgr).
		// Uncomment the following line adding a pointer to an instance of the controlled resource as an argument
		For(&cloudv1.Network{}, builder.WithPredicates(p, pd)).
		// TODO(tangent): Revisit to consider the objects created by Helm.
		Owns(&cloudv1.Cluster{}).
		Owns(&v1alpha1.EKSConnection{}).
		Owns(&v1beta1.ProviderConfig{}).
		Complete(r)
}