package imap

import (
	osm "git.loafle.net/overflow/service_matcher-go"
)

const (
	PRE_COMPARE_STR  = "* OK"
	SEND_COMPARE_STR = "* BYE"
)

type IMAPMatcher struct {
	osm.Matchers
}

func (m *IMAPMatcher) Key() string {
	return "IMAP"
}

func (m *IMAPMatcher) Type() string {
	return "MAIL"
}
func (m *IMAPMatcher) Vendor(matchCtx *osm.MatchCtx) string {
	return "UNKNOWN"
}

func (m *IMAPMatcher) Version(matchCtx *osm.MatchCtx) string {
	return "UNKNOWN"
}

func (m *IMAPMatcher) OsType(matchCtx *osm.MatchCtx) string {
	return "UNKNOWN"
}

func (m *IMAPMatcher) OsVersion(matchCtx *osm.MatchCtx) string {
	return "UNKNOWN"
}

func (m *IMAPMatcher) Name(matchCtx *osm.MatchCtx) string {
	return "IMAP"
}

func (m *IMAPMatcher) IsPrePacket() bool {
	return true
}

func (m *IMAPMatcher) HasResponse(matchCtx *osm.MatchCtx, index int) bool {
	return true
}

func (m *IMAPMatcher) IsError(matchCtx *osm.MatchCtx, index int, packet *osm.Packet) bool {
	return false
}

func (m *IMAPMatcher) Match(matchCtx *osm.MatchCtx, index int, packet *osm.Packet) error {

	switch index {
	case 0:

		recvStr := string(packet.Bytes())

		if len(recvStr) < 3 {
			return osm.NotMatchedError()
		}

		compareStr := recvStr[0:4]

		if compareStr == PRE_COMPARE_STR {
			return nil
		}

	case 1:

		recvStr := string(packet.Bytes())

		if len(recvStr) < 5 {
			return osm.NotMatchedError()
		}

		compareStr := recvStr[0:5]

		if compareStr == SEND_COMPARE_STR {
			return nil
		}

	}

	return osm.NotMatchedError()
}

func NewMatcher() osm.Matcher {

	m := &IMAPMatcher{}

	reqStr := "A0001 LOGOUT\r\n"
	byte := make([]byte, len(reqStr))
	copy(byte[:], reqStr)

	m.AddPacket(osm.NewPacket(byte, len(reqStr)))

	return m

}