package versioncontract

import "strings"

// ValidStableVersion reports whether version uses the selected vMAJOR.MINOR.PATCH form.
func ValidStableVersion(version string) bool {
	if !strings.HasPrefix(version, "v") {
		return false
	}
	components := strings.Split(version[1:], ".")
	if len(components) != 3 {
		return false
	}
	for _, component := range components {
		if component == "" || len(component) > 1 && component[0] == '0' {
			return false
		}
		for i := 0; i < len(component); i++ {
			if component[i] < '0' || component[i] > '9' {
				return false
			}
		}
	}
	return true
}