package stacks

import (
	"encoding/base64"
	"fmt"
	"net/http"

	"github.com/porter-dev/porter/api/server/authz"
	"github.com/porter-dev/porter/api/server/handlers"
	"github.com/porter-dev/porter/api/server/shared"
	"github.com/porter-dev/porter/api/server/shared/apierrors"
	"github.com/porter-dev/porter/api/server/shared/config"
	"github.com/porter-dev/porter/api/types"
	"github.com/porter-dev/porter/internal/helm"
	"github.com/porter-dev/porter/internal/models"
)

type CreateStackHandler struct {
	handlers.PorterHandlerReadWriter
	authz.KubernetesAgentGetter
}

func NewCreateStackHandler(
	config *config.Config,
	decoderValidator shared.RequestDecoderValidator,
	writer shared.ResultWriter,
) *CreateStackHandler {
	return &CreateStackHandler{
		PorterHandlerReadWriter: handlers.NewDefaultPorterHandler(config, decoderValidator, writer),
		KubernetesAgentGetter:   authz.NewOutOfClusterAgentGetter(config),
	}
}

func (c *CreateStackHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	cluster, _ := ctx.Value(types.ClusterScope).(*models.Cluster)

	request := &types.CreateStackReleaseRequest{}
	if ok := c.DecodeAndValidate(w, r, request); !ok {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error decoding request")))
		return
	}
	stackName := request.StackName
	namespace := fmt.Sprintf("porter-stack-%s", stackName)
	porterYamlBase64 := request.PorterYAMLBase64
	porterYaml, err := base64.StdEncoding.DecodeString(porterYamlBase64)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error decoding porter yaml: %w", err)))
		return
	}

	imageInfo := request.ImageInfo
	chart, values, err := parse(porterYaml, &imageInfo, c.Config(), cluster.ProjectID)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error with test: %w", err)))
		return
	}

	helmAgent, err := c.GetHelmAgent(r, cluster, namespace)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error getting helm agent: %w", err)))
		return
	}

	k8sAgent, err := c.GetAgent(r, cluster, namespace)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error getting k8s agent: %w", err)))
		return
	}

	// create the namespace if it does not exist already
	_, err = k8sAgent.CreateNamespace(namespace, nil)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error creating namespace: %w", err)))
		return
	}

	registries, err := c.Repo().Registry().ListRegistriesByProjectID(cluster.ProjectID)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrInternal(fmt.Errorf("error listing registries: %w", err)))
		return
	}

	conf := &helm.InstallChartConfig{
		Chart:      chart,
		Name:       stackName,
		Namespace:  namespace,
		Values:     values,
		Cluster:    cluster,
		Repo:       c.Repo(),
		Registries: registries,
	}

	_, err = helmAgent.InstallChart(conf, c.Config().DOConf, c.Config().ServerConf.DisablePullSecretsInjection)
	if err != nil {
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(
			fmt.Errorf("error installing a new chart: %s", err.Error()),
			http.StatusBadRequest,
		))

		return
	}
	w.WriteHeader(http.StatusCreated)
}