package release

import "slices"

// Comparing a file against a MusicBrainz track: shared by the importer's
// check of a download and the library listing's match of an album (#5569).

// LengthFits allows five seconds or 3%, whichever is more: remasters and
// rips differ by a second or two, a different recording by far more. A
// track MusicBrainz has no length for says nothing against the file.
func LengthFits(fileMs, trackMs int) bool {
	if trackMs <= 0 {
		return true
	}
	if fileMs <= 0 {
		return false
	}
	tol := max(5000, trackMs*3/100)
	d := fileMs - trackMs
	return d <= tol && -d <= tol
}

// TitleAgrees: the same words, or one title holding all of the other's
// ("Get Lucky (Radio Edit)" holds "Get Lucky").
func TitleAgrees(a, b string) bool {
	ta, tb := Tokens(a), Tokens(b)
	if len(ta) == 0 || len(tb) == 0 {
		return false
	}
	return subset(ta, tb) || subset(tb, ta)
}

func subset(small, big []string) bool {
	for _, w := range small {
		if !slices.Contains(big, w) {
			return false
		}
	}
	return true
}