package aks

import (
	"context"
	"fmt"
	"time"

	azurenetworkv1beta1 "github.com/upbound/provider-azure/apis/network/v1beta1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"k8s.io/utils/ptr"

	"github.com/tidbcloud/infra-provider/regional-server/pkg/cloud/azure"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/consts"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/controllers"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/controllers/appbox/task"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/deploy"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/k8s"
	"github.com/tidbcloud/infra-provider/regional-server/pkg/util"
)

type apiServerEndpoint struct {
	*task.BaseTask
	azureCli azure.Client
}

func NewAPIServerEndpoint(ctx *task.Context, azureCli azure.Client) deploy.Task {
	return &apiServerEndpoint{
		BaseTask: &task.BaseTask{Context: ctx},
		azureCli: azureCli,
	}
}

func (t *apiServerEndpoint) Name() string {
	return "APIServerEndpoint"
}

func (t *apiServerEndpoint) Create(ctx context.Context) deploy.Result {
	t.BeginAt = util.Pointer(time.Now())
	controlPlaneCfg, alias, err := t.endpointInputs(ctx)
	if err != nil {
		return deploy.Panic(err).WithRequeuAfter(defaultRequeuInterval)
	}

	labels := util.MergeMaps(t.Namer.Labels(), t.APPBox.Labels)
	tags := controllers.ConvertToCloudTags(t.APPBox.Labels, consts.ProviderTypeAKS)
	tags = util.MergeMaps(tags, t.Config.AdditionalCloudTags)

	pe := buildPrivateEndpoint(t.endpointName(), t.APPBox.Spec.Region, alias, controlPlaneCfg.ProviderConfigName, controlPlaneCfg, labels, tags)
	if err := k8s.Apply(ctx, t.Local, pe); err != nil {
		return deploy.Panic(err).WithRequeuAfter(defaultRequeuInterval)
	}
	return deploy.Done()
}

func (t *apiServerEndpoint) PostCreate(ctx context.Context) deploy.Result {
	_, alias, err := t.endpointInputs(ctx)
	if err != nil {
		return deploy.Panic(err).WithRequeuAfter(defaultRequeuInterval)
	}
	if alias == "" {
		return deploy.Panic(fmt.Errorf("api server private link service alias is empty")).WithRequeuAfter(defaultRequeuInterval)
	}

	pe := &azurenetworkv1beta1.PrivateEndpoint{}
	if err := t.Local.Get(ctx, types.NamespacedName{Name: t.endpointName()}, pe); err != nil {
		return deploy.Panic(err).WithRequeuAfter(defaultRequeuInterval)
	}
	if !privateEndpointReady(pe) {
		return deploy.Panic(fmt.Errorf("api server private endpoint is not ready")).WithRequeuAfter(defaultRequeuInterval)
	}
	if err := approvePrivateEndpointConnection(
		ctx,
		t.azureCli,
		t.ProviderConfigName(),
		controllers.GetResourceGroupName(t.VPC, t.Config.ResourceNamePrefix),
		t.resourceName(),
		ptr.Deref(pe.Status.AtProvider.ID, ""),
	); err != nil {
		return deploy.Panic(err).WithRequeuAfter(defaultRequeuInterval)
	}
	return deploy.Done()
}

func (t *apiServerEndpoint) Delete(ctx context.Context) deploy.Result {
	return deploy.PanicOrDone(controllers.DeleteUpboundResource(ctx, t.Local, &azurenetworkv1beta1.PrivateEndpoint{
		ObjectMeta: metav1.ObjectMeta{Name: t.endpointName()},
	}))
}

func (t *apiServerEndpoint) PostDelete(ctx context.Context) deploy.Result {
	return deploy.PanicOrDone(k8s.GetDeletedObject(ctx, t.Local, types.NamespacedName{Name: t.endpointName()}, &azurenetworkv1beta1.PrivateEndpoint{}))
}

func (t *apiServerEndpoint) endpointInputs(ctx context.Context) (*azureControlPlanePrivateLinkConfig, string, error) {
	controlPlaneCfg, err := getAzureControlPlanePrivateLinkConfig(t.Config)
	if err != nil {
		return nil, "", err
	}
	pls := &azurenetworkv1beta1.PrivateLinkService{}
	if err := t.Local.Get(ctx, types.NamespacedName{Name: t.resourceName()}, pls); err != nil {
		return nil, "", err
	}
	return controlPlaneCfg, ptr.Deref(pls.Status.AtProvider.Alias, ""), nil
}

func (t *apiServerEndpoint) resourceName() string {
	return aksClusterName(t.APPBox) + apiServerPrivateLinkServiceSuffix
}

func (t *apiServerEndpoint) endpointName() string {
	return aksClusterName(t.APPBox) + apiServerPrivateEndpointSuffix
}