// Nearly all code is taken from src/cmd/go/internal/auth/netrc.go

package tofuproxy

import (
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"strings"
)

func findInNetrc(host string) (string, string) {
	netrcPath, ok := os.LookupEnv("NETRC")
	if !ok {
		homeDir, err := os.UserHomeDir()
		if err != nil {
			log.Fatalln(err)
		}
		netrcPath = filepath.Join(homeDir, ".netrc")
	}
	data, err := ioutil.ReadFile(netrcPath)
	if err != nil {
		if os.IsNotExist(err) {
			return "", ""
		}
		log.Fatalln(err)
	}
	inMacro := false
	var machine, login, password string
	for _, line := range strings.Split(string(data), "\n") {
		if inMacro {
			if line == "" {
				inMacro = false
			}
			continue
		}
		fields := strings.Fields(line)
		i := 0
		for ; i < len(fields)-1; i += 2 {
			switch fields[i] {
			case "machine":
				machine = fields[i+1]
				login = ""
				password = ""
			case "default":
				break
			case "login":
				login = fields[i+1]
			case "password":
				password = fields[i+1]
			case "macdef":
				inMacro = true
			}
			if machine != "" && login != "" && password != "" {
				if machine == host {
					return login, password
				}
				machine, login, password = "", "", ""
			}
		}
		if i < len(fields) && fields[i] == "default" {
			break
		}
	}
	return "", ""
}