package health

import (
	"crypto/tls"
	"encoding/base64"
	"fmt"
	"net"
	"time"

	cnsm "git.loafle.net/commons/service_matcher-go"
	cuej "git.loafle.net/commons_go/util/encoding/json"
	ocsm "git.loafle.net/overflow/commons-go/sensorconfig/model"
	"git.loafle.net/overflow/crawler-go"
)

type SocketHeahthCrawler struct {
	crawler.Crawler
	m cnsm.Matcher
}

func (s *SocketHeahthCrawler) SetMatcher(m cnsm.Matcher) {
	s.m = m
}

func (s *SocketHeahthCrawler) getConnection(config *ocsm.SensorConfig) (net.Conn, error) {
	connection := config.Target.Connection

	ip := connection.IP
	port := connection.Port
	portType := connection.PortType
	ssl := connection.SSL

	addr := fmt.Sprintf("%s:%s", ip, port)

	conn, err := net.Dial(portType, addr)
	if err != nil {
		return nil, err
	}

	if ssl {
		cfg := &tls.Config{
			InsecureSkipVerify: true,
			ServerName:         ip,
			ClientAuth:         tls.RequestClientCert,
		}
		tlsConn := tls.Client(conn, cfg)
		if err := tlsConn.Handshake(); err != nil {
			return nil, err
		}

		conn = tlsConn
	}

	return conn, nil
}

func (s *SocketHeahthCrawler) CheckHeahth(config *ocsm.SensorConfig) (result map[string]string, err error) {
	result = make(map[string]string, 0)

	result["StartTime"] = time.Now().String()

	conn, cErr := s.getConnection(config)
	if cErr != nil {
		result["Error"] = cErr.Error()
		err = cErr
		return
	}
	defer conn.Close()

	connection := config.Target.Connection
	port, _ := cuej.NumberToInt(connection.Port)
	info := cnsm.NewMatchInfo(connection.IP, port)

	if s.m.IsPrePacket() {
		result["PacketType"] = "Pre"

		buf := make([]byte, 1024)
		n, _ := conn.Read(buf)
		p := cnsm.NewPacket(buf, n)
		if !s.m.Match(info, 0, p) {
			result["Packet"] = convertBase64(buf)
			result["Error"] = "Not Matched"
			return
		}

		for i := 0; i < s.m.PacketCount(); i++ {
			pack := s.m.Packet(i)
			conn.Write(pack.Buffer)
			buf := make([]byte, 1024)
			n, _ := conn.Read(buf)

			if !s.m.HasResponse(i + 1) { // empty last response
				break
			}

			p := cnsm.NewPacket(buf, n)
			if s.m.Match(info, i+1, p) == false {
				result["Packet"] = convertBase64(buf)
				result["Error"] = "Not Matched"
				return
			}
		}

	} else {
		result["PacketType"] = "Post"

		for i := 0; i < s.m.PacketCount(); i++ {
			pack := s.m.Packet(i)
			conn.Write(pack.Buffer)
			buf := make([]byte, 1024)
			n, _ := conn.Read(buf)

			if !s.m.HasResponse(i) { // empty last response
				break
			}

			p := cnsm.NewPacket(buf, n)
			if s.m.Match(info, i, p) == false {
				result["Packet"] = convertBase64(buf)
				result["Error"] = "Not Matched"
				return
			}
		}
	}

	result["EndTime"] = time.Now().String()

	return
}

func convertBase64(buf []byte) string {
	return base64.StdEncoding.EncodeToString(buf)
}