package endpointgroups

import (
	"net/http"

	"github.com/portainer/portainer"
	httperror "github.com/portainer/portainer/http/error"
	"github.com/portainer/portainer/http/request"
	"github.com/portainer/portainer/http/response"
)

type endpointGroupUpdatePayload struct {
	Name                string
	Description         string
	AssociatedEndpoints []portainer.EndpointID
	Tags                []string
}

func (payload *endpointGroupUpdatePayload) Validate(r *http.Request) error {
	return nil
}

// PUT request on /api/endpoint_groups/:id
func (handler *Handler) endpointGroupUpdate(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
	endpointGroupID, err := request.RetrieveNumericRouteVariableValue(r, "id")
	if err != nil {
		return &httperror.HandlerError{http.StatusBadRequest, "Invalid endpoint group identifier route variable", err}
	}

	var payload endpointGroupUpdatePayload
	err = request.DecodeAndValidateJSONPayload(r, &payload)
	if err != nil {
		return &httperror.HandlerError{http.StatusBadRequest, "Invalid request payload", err}
	}

	endpointGroup, err := handler.EndpointGroupService.EndpointGroup(portainer.EndpointGroupID(endpointGroupID))
	if err == portainer.ErrObjectNotFound {
		return &httperror.HandlerError{http.StatusNotFound, "Unable to find an endpoint group with the specified identifier inside the database", err}
	} else if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to find an endpoint group with the specified identifier inside the database", err}
	}

	if payload.Name != "" {
		endpointGroup.Name = payload.Name
	}

	if payload.Description != "" {
		endpointGroup.Description = payload.Description
	}

	if payload.Tags != nil {
		endpointGroup.Tags = payload.Tags
	}

	err = handler.EndpointGroupService.UpdateEndpointGroup(endpointGroup.ID, endpointGroup)
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to persist endpoint group changes inside the database", err}
	}

	endpoints, err := handler.EndpointService.Endpoints()
	if err != nil {
		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve endpoints from the database", err}
	}

	for _, endpoint := range endpoints {
		err = handler.updateEndpointGroup(endpoint, portainer.EndpointGroupID(endpointGroupID), payload.AssociatedEndpoints)
		if err != nil {
			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to update endpoint", err}
		}
	}

	return response.JSON(w, endpointGroup)
}