package helm

import (
	"net/http"

	"github.com/gorilla/mux"
	httperror "github.com/portainer/libhttp/error"
	portainer "github.com/portainer/portainer/api"
	"github.com/portainer/portainer/api/dataservices"
	"github.com/portainer/portainer/api/http/middlewares"
	"github.com/portainer/portainer/api/http/security"
	"github.com/portainer/portainer/api/kubernetes"
	"github.com/portainer/portainer/pkg/libhelm"
	"github.com/portainer/portainer/pkg/libhelm/options"
)

type requestBouncer interface {
	AuthenticatedAccess(h http.Handler) http.Handler
}

// Handler is the HTTP handler used to handle environment(endpoint) group operations.
type Handler struct {
	*mux.Router
	requestBouncer           requestBouncer
	dataStore                dataservices.DataStore
	jwtService               dataservices.JWTService
	kubeClusterAccessService kubernetes.KubeClusterAccessService
	kubernetesDeployer       portainer.KubernetesDeployer
	helmPackageManager       libhelm.HelmPackageManager
}

// NewHandler creates a handler to manage endpoint group operations.
func NewHandler(bouncer requestBouncer, dataStore dataservices.DataStore, jwtService dataservices.JWTService, kubernetesDeployer portainer.KubernetesDeployer, helmPackageManager libhelm.HelmPackageManager, kubeClusterAccessService kubernetes.KubeClusterAccessService) *Handler {
	h := &Handler{
		Router:                   mux.NewRouter(),
		requestBouncer:           bouncer,
		dataStore:                dataStore,
		jwtService:               jwtService,
		kubernetesDeployer:       kubernetesDeployer,
		helmPackageManager:       helmPackageManager,
		kubeClusterAccessService: kubeClusterAccessService,
	}

	h.Use(middlewares.WithEndpoint(dataStore.Endpoint(), "id"))

	// `helm list -o json`
	h.Handle("/{id}/kubernetes/helm",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.helmList))).Methods(http.MethodGet)

	// `helm delete RELEASE_NAME`
	h.Handle("/{id}/kubernetes/helm/{release}",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.helmDelete))).Methods(http.MethodDelete)

	// `helm install [NAME] [CHART] flags`
	h.Handle("/{id}/kubernetes/helm",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.helmInstall))).Methods(http.MethodPost)

	h.Handle("/{id}/kubernetes/helm/repositories",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.userGetHelmRepos))).Methods(http.MethodGet)
	h.Handle("/{id}/kubernetes/helm/repositories",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.userCreateHelmRepo))).Methods(http.MethodPost)

	return h
}

// NewTemplateHandler creates a template handler to manage environment(endpoint) group operations.
func NewTemplateHandler(bouncer requestBouncer, helmPackageManager libhelm.HelmPackageManager) *Handler {
	h := &Handler{
		Router:             mux.NewRouter(),
		helmPackageManager: helmPackageManager,
		requestBouncer:     bouncer,
	}

	h.Handle("/templates/helm",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.helmRepoSearch))).Methods(http.MethodGet)

	// helm show [COMMAND] [CHART] [REPO] flags
	h.Handle("/templates/helm/{command:chart|values|readme}",
		bouncer.AuthenticatedAccess(httperror.LoggerHandler(h.helmShow))).Methods(http.MethodGet)

	return h
}

// getHelmClusterAccess obtains the core k8s cluster access details from request.
// The cluster access includes the cluster server url, the user's bearer token and the tls certificate.
// The cluster access is passed in as kube config CLI params to helm binary.
func (handler *Handler) getHelmClusterAccess(r *http.Request) (*options.KubernetesClusterAccess, *httperror.HandlerError) {
	endpoint, err := middlewares.FetchEndpoint(r)
	if err != nil {
		return nil, httperror.NotFound("Unable to find an environment on request context", err)
	}

	tokenData, err := security.RetrieveTokenData(r)
	if err != nil {
		return nil, httperror.InternalServerError("Unable to retrieve user authentication token", err)
	}

	bearerToken, err := handler.jwtService.GenerateToken(tokenData)
	if err != nil {
		return nil, httperror.Unauthorized("Unauthorized", err)
	}

	sslSettings, err := handler.dataStore.SSLSettings().Settings()
	if err != nil {
		return nil, httperror.InternalServerError("Unable to retrieve settings from the database", err)
	}

	hostURL := "localhost"
	if !sslSettings.SelfSigned {
		hostURL = r.Host
	}

	kubeConfigInternal := handler.kubeClusterAccessService.GetClusterDetails(hostURL, endpoint.ID, true)
	return &options.KubernetesClusterAccess{
		ClusterServerURL:         kubeConfigInternal.ClusterServerURL,
		CertificateAuthorityFile: kubeConfigInternal.CertificateAuthorityFile,
		AuthToken:                bearerToken,
	}, nil
}