package main

// get https://www.expressvpn.com/vpn-server
// remove everyting starting with >
// remove until "Not supported" and after What the green checks mean

import (
	"bufio"
	"fmt"
	"net"
	"net/http"
	"strings"
	"time"
)

func getServerList(url string) []string {
	ret := []string{}
	// Create HTTP client with timeout
	client := &http.Client{
		Timeout: 30 * time.Second,
	}

	// Make request
	response, err := client.Get(url)
	if err != nil {
		fmt.Println(err)
		return nil
	}
	defer response.Body.Close()

	buf := bufio.NewReader(bufio.NewReader(response.Body))
	start := false
	for {
		line, err := buf.ReadString('\n')
		if err != nil {
			break
		}
		line = strings.Trim(line, "\n\r ")
		if strings.HasPrefix(line, "<") {
			continue
		}
		if line == "Not supported" {
			start = true
			continue
		}
		if line == "What the green checks mean" {
			start = false
		}
		if !start {
			continue
		}

		if line == "" {
			continue
		}

		// france-paris-1-ca-version-2.expressnetw.com
		line = strings.ToLower(line)
		line = strings.ReplaceAll(line, " &amp; ", "")
		line = strings.ReplaceAll(line, " ", "")

		name := fmt.Sprintf("%s-ca-version-2.expressnetw.com", line)
		fmt.Println(name)

		if _, err := net.ResolveIPAddr("ip4", name); err == nil {
			ret = append(ret, name)
		}
	}

	return ret
}