package pop

import (
	"git.loafle.net/overflow/overflow_discovery/service/matcher"
)

const (
	COMPARE_STR = "+OK"
)

type POPMatcher struct {
	matcher.Matchers
}

func (p *POPMatcher) ServiceName() string {
	return "POP3"
}

func (p *POPMatcher) IsPrePacket() bool {
	return true
}

func (p *POPMatcher) HasResponse(index int) bool {
	return true
}

func (p *POPMatcher) IsError(info matcher.MatchInfo, index int, packet *matcher.Packet) bool {
	return false
}

func (p *POPMatcher) Match(info matcher.MatchInfo, index int, packet *matcher.Packet) bool {

	switch index {
	case 0:
		fallthrough
	case 1:
		recvStr := string(packet.Buffer)

		if len(recvStr) < 3 {
			return false
		}

		compareStr := recvStr[0:3]

		if compareStr == COMPARE_STR {
			return true
		}

	}

	return false
}

func NewMatcher() matcher.Matcher {

	m := &POPMatcher{}

	reqStr := "QUIT\r\n"
	byte := make([]byte, len(reqStr))
	copy(byte[:], reqStr)
	m.AddPacket(matcher.NewPacket(byte, len(reqStr)))

	return m

}