package util

import "strings"

// Check for port in resolvers
func Port(resolvers []string) []string {
	// No resolvers found
	if len(resolvers) == 0 {
		resolvers = append(resolvers, "1.1.1.1:53")
		resolvers = append(resolvers, "9.9.9.9:53")
		return resolvers
	}

	// Go through resolvers
	for index, resolver := range resolvers {
		// Split
		split := strings.Split(resolver, ":")

		// No port found
		if len(split) == 1 {
			// Ignore empty & commented lines
			if resolver != "" && !strings.HasPrefix(resolver, "#") {
				resolvers[index] = resolver + ":53"
			}
		}
	}

	return resolvers
}