package edgegroups

import (
	"errors"
	"net/http"

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

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

func (payload *edgeGroupCreatePayload) Validate(r *http.Request) error {
	if len(payload.Name) == 0 {
		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
}

func calculateEndpointsOrTags(tx dataservices.DataStoreTx, edgeGroup *portainer.EdgeGroup, endpoints []portainer.EndpointID, tagIDs []portainer.TagID) error {
	if edgeGroup.Dynamic {
		edgeGroup.TagIDs = tagIDs

		return nil
	}

	endpointIDs := []portainer.EndpointID{}

	for _, endpointID := range 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

	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
	if err := request.DecodeAndValidateJSONPayload(r, &payload); 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().ReadAll()
		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 err := calculateEndpointsOrTags(tx, edgeGroup, payload.Endpoints, payload.TagIDs); err != nil {
			return err
		}

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

		return nil
	})

	return txResponse(w, edgeGroup, err)
}