package irc

import (
	"encoding/base64"
	"errors"
	"fmt"
	"strings"
)

type SASLResult struct {
	Failed bool
	Err    error
}

func (irc *Connection) setupSASLCallbacks(result chan<- *SASLResult) {
	irc.AddCallback("CAP", func(e *Event) {
		if len(e.Arguments) == 3 {
			if e.Arguments[1] == "LS" {
				if !strings.Contains(e.Arguments[2], "sasl") {
					result <- &SASLResult{true, errors.New("no SASL capability " + e.Arguments[2])}
				}
			}
			if e.Arguments[1] == "ACK" && e.Arguments[2] == "sasl" {
				if irc.SASLMech != "PLAIN" {
					result <- &SASLResult{true, errors.New("only PLAIN is supported")}
				}
				irc.SendRaw("AUTHENTICATE " + irc.SASLMech)
			}
		}
	})
	irc.AddCallback("AUTHENTICATE", func(e *Event) {
		str := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s\x00%s\x00%s", irc.SASLLogin, irc.SASLLogin, irc.SASLPassword)))
		irc.SendRaw("AUTHENTICATE " + str)
	})
	irc.AddCallback("901", func(e *Event) {
		irc.SendRaw("CAP END")
		irc.SendRaw("QUIT")
		result <- &SASLResult{true, errors.New(e.Arguments[1])}
	})
	irc.AddCallback("902", func(e *Event) {
		irc.SendRaw("CAP END")
		irc.SendRaw("QUIT")
		result <- &SASLResult{true, errors.New(e.Arguments[1])}
	})
	irc.AddCallback("903", func(e *Event) {
		result <- &SASLResult{false, nil}
	})
	irc.AddCallback("904", func(e *Event) {
		irc.SendRaw("CAP END")
		irc.SendRaw("QUIT")
		result <- &SASLResult{true, errors.New(e.Arguments[1])}
	})
}