package resolver

import "sync"

var (
	globalResolver *FastResolver
	resolverOnce   sync.Once
)

// GetGlobalResolver returns singleton resolver instance
func GetGlobalResolver(cacheDir, mirror, suite, component string) (*FastResolver, error) {
	var err error

	resolverOnce.Do(func() {
		r := NewFastResolver(cacheDir)

		err = r.LoadIndex(mirror, suite, component)
		if err != nil {
			return
		}

		globalResolver = r
	})

	return globalResolver, err
}