package edgegroups

import (
	"errors"
	"net/http"

	httperror "github.com/portainer/libhttp/error"
	"github.com/portainer/libhttp/request"
	portainer "github.com/portainer/portainer/api"
	"github.com/portainer/portainer/api/dataservices"
	"github.com/portainer/portainer/api/internal/endpointutils"

	"github.com/asaskevich/govalidator"
)

type edgeGroupCreatePayload struct {
	Name         string
	Dynamic      bool
	TagIDs       []portainer.TagID
	Endpoints    []portainer.EndpointID
	PartialMatch bool
}

func (payload *edgeGroupCreatePayload) Validate(r *http.Request) error {
	if govalidator.IsNull(payload.Name) {
		return errors.New("invalid Edge group name")
	}

	if payload.Dynamic && len(payload.TagIDs) == 0 {
		return errors.New("tagIDs is mandatory for a dynamic Edge group")
	}

	return nil
}

// @id EdgeGroupCreate
// @summary Create an EdgeGroup
// @description **Access policy**: administrator
// @tags edge_groups
// @security ApiKeyAuth
// @security jwt
// @accept json
// @produce json
// @param body body edgeGroupCreatePayload true "EdgeGroup data"
// @success 200 {object} portainer.EdgeGroup
// @failure 503 "Edge compute features are disabled"
// @failure 500
// @router /edge_groups [post]
func (handler *Handler) edgeGroupCreate(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
	var payload edgeGroupCreatePayload
	err := request.DecodeAndValidateJSONPayload(r, &payload)
	if err != nil {
		return httperror.BadRequest("Invalid request payload", err)
	}

	var edgeGroup *portainer.EdgeGroup
	err = handler.DataStore.UpdateTx(func(tx dataservices.DataStoreTx) error {
		edgeGroups, err := tx.EdgeGroup().EdgeGroups()
		if err != nil {
			return httperror.InternalServerError("Unable to retrieve Edge groups from the database", err)
		}

		for _, edgeGroup := range edgeGroups {
			if edgeGroup.Name == payload.Name {
				return httperror.BadRequest("Edge group name must be unique", errors.New("edge group name must be unique"))
			}
		}

		edgeGroup = &portainer.EdgeGroup{
			Name:         payload.Name,
			Dynamic:      payload.Dynamic,
			TagIDs:       []portainer.TagID{},
			Endpoints:    []portainer.EndpointID{},
			PartialMatch: payload.PartialMatch,
		}

		if edgeGroup.Dynamic {
			edgeGroup.TagIDs = payload.TagIDs
		} else {
			endpointIDs := []portainer.EndpointID{}
			for _, endpointID := range payload.Endpoints {
				endpoint, err := tx.Endpoint().Endpoint(endpointID)
				if err != nil {
					return httperror.InternalServerError("Unable to retrieve environment from the database", err)
				}

				if endpointutils.IsEdgeEndpoint(endpoint) {
					endpointIDs = append(endpointIDs, endpoint.ID)
				}
			}
			edgeGroup.Endpoints = endpointIDs
		}

		err = tx.EdgeGroup().Create(edgeGroup)
		if err != nil {
			return httperror.InternalServerError("Unable to persist the Edge group inside the database", err)
		}

		return nil
	})

	return txResponse(w, edgeGroup, err)
}