package netboxapi

import (
	"context"

	e "git.stinnesbeck.com/nils/errorhandler"
	"github.com/netbox-community/go-netbox/v3/netbox/client/virtualization"
	"github.com/netbox-community/go-netbox/v3/netbox/models"
)

// GetClusters returns Clusters from the api nb filtered by the parameter list param
func (nb NetBoxAPI) GetClusters(param virtualization.VirtualizationClustersListParams) ([]*models.Cluster, error) {
	// check if context was set, if not set background
	if param.Context == nil {
		param.Context = context.Background()
	}

	var defaultOffset int64
	var defaultLimit int64 = 50

	// set Offset if not set before
	if param.Limit == nil {
		param.Limit = &defaultLimit
	}

	// set Offset if not set before
	if param.Offset == nil {
		param.Offset = &defaultOffset
	}

	// get clusters
	clusters, err := nb.API.Virtualization.VirtualizationClustersList(&param, nil)
	if err != nil {
		return nil, e.FormatError("can't get clusters", err)
	}

	// check if there are more prefixes on other pages
	if clusters.Payload.Next == nil {
		// return the results of the first batch, there are no others
		return clusters.Payload.Results, nil
	}

	// there are more pages to get

	// calculate new offset
	newOffset := *param.Offset + *param.Limit

	// set new offset
	param.Offset = &newOffset

	// get prefixes from next page
	nextPagePrefixes, err := nb.GetClusters(param)
	if err != nil {
		return nil, e.FormatError("can't get prefixes", err)
	}

	// append the results from next page to our prefixes to return
	clusters.Payload.Results = append(clusters.Payload.Results, nextPagePrefixes...)

	// return all prefixes
	return clusters.Payload.Results, nil
}