package service

import (
	"encoding/json"
	"fmt"
	"sort"

	"go-places-api/internal/domain"
)

// marshalPayload encodes an event payload as JSON.
func marshalPayload(payload map[string]any) (json.RawMessage, error) {
	body, err := json.Marshal(payload)
	if err != nil {
		return nil, fmt.Errorf("service: marshal event payload: %w", err)
	}
	return json.RawMessage(body), nil
}

// sortRelated orders related places by distance, then by identifier so the
// result is stable for equal distances.
func sortRelated(in []domain.RelatedPlace) {
	sort.SliceStable(in, func(i, j int) bool {
		if in[i].DistanceMeters != in[j].DistanceMeters {
			return in[i].DistanceMeters < in[j].DistanceMeters
		}
		return in[i].Place.ID < in[j].Place.ID
	})
}