package pop

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

const (
	COMPARE_STR = "+OK"
)

type POPMatcher struct {
	osm.Matchers
}

func (m *POPMatcher) Key() string {
	return "POP3"
}

func (m *POPMatcher) Name(matchCtx *osm.MatchCtx) string {
	return "POP3"
}

func (m *POPMatcher) IsPrePacket(matchCtx *osm.MatchCtx) bool {
	return true
}

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

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

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

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

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

		compareStr := recvStr[0:3]

		if compareStr == COMPARE_STR {
			return nil
		}

	}

	return osm.NotMatchedError()
}

func NewMatcher() osm.Matcher {

	m := &POPMatcher{}

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

	return m

}