package parser

import (
	"bufio"
	"io"
	"net/netip"
	"strings"

	"git.maze.io/maze/styx/internal/sliceutil"
)

func init() {
	RegisterNetworksParser(mikroTikNetworksParser{})
}

type mikroTikNetworksParser struct{}

func (mikroTikNetworksParser) CanHandle(line string) bool {
	return line == "/ip firewall address-list" ||
		strings.HasPrefix(line, "add address=")
}

func (mikroTikNetworksParser) ParseNetworks(r io.Reader) (prefixes []netip.Prefix, ignored int, err error) {
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if isComment(line) || line == "/ip firewall address-list" {
			continue
		}
		if strings.HasPrefix(line, "add address=") {
			part := strings.Fields(line[12:])
			if prefix, err := netip.ParsePrefix(part[0]); err == nil {
				prefixes = append(prefixes, prefix)
				continue
			}
		}
		ignored++
	}
	if err = scanner.Err(); err != nil {
		return
	}
	return sliceutil.Unique(prefixes), ignored, nil
}