package sync

import (
	"fmt"
	"strings"
)

type diff struct {
	put    []string
	delete []string
}

func (d diff) IsEmpty() bool {
	return len(d.put) == 0 && len(d.delete) == 0
}

func (d diff) String() string {
	if d.IsEmpty() {
		return "no changes"
	}
	var changes []string
	if len(d.put) > 0 {
		changes = append(changes, fmt.Sprintf("PUT: %s", strings.Join(d.put, ", ")))
	}
	if len(d.delete) > 0 {
		changes = append(changes, fmt.Sprintf("DELETE: %s", strings.Join(d.delete, ", ")))
	}
	return strings.Join(changes, ", ")
}