package parser

import (
	"bufio"
	"io"
	"net"
	"strings"
)

func init() {
	domainsParsers = append(domainsParsers, domainsParser{})
}

type domainsParser struct{}

func (domainsParser) CanHandle(line string) bool {
	return isDomainName(line) &&
		!strings.ContainsRune(line, ' ') &&
		!strings.ContainsRune(line, ':') &&
		net.ParseIP(line) == nil
}

func (domainsParser) ParseDomains(r io.Reader) (domains []string, ignored int, err error) {
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if isComment(line) {
			continue
		}
		if isDomainName(line) {
			domains = append(domains, line)
			continue
		}
		ignored++
	}
	if err = scanner.Err(); err != nil {
		return
	}
	return unique(domains), ignored, nil
}