package main

import (
	"errors"
	"fmt"
	"gitea.unprism.ru/KRBL/n9m/v2"
	"io"
	"net"
	"os"
	"syscall"
)

var mainPack *n9m.SmartPackage
var videoPack *n9m.SmartPackage

func main() {
	conn, err := net.Dial("tcp", "10.100.100.99:9006")

	if err != nil {
		panic(err)
	}

	var pack = n9m.Package{}

	pack.Payload.Module = "CERTIFICATE"
	pack.Payload.Operation = "CONNECT"
	pack.SetParameters(n9m.CertificateConnectClientRequest{})
	conn.Write(pack.PackPackage())

	handle(conn, &mainPack)
}

func handleSpecialPackages(_ *n9m.SmartPackage, pack n9m.Package) error {
	switch pack.SSRC {
	case n9m.SpecialPayloadTypeGPS:
		fmt.Printf("%+v\n", pack.GPS)
		return nil
	default:
		return fmt.Errorf("unhandled special operation: %d", pack.SSRC)
	}
}

func handleCertificateConnect(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.CertificateConnectClientResponse

	if err = pack.GetResponseAs(&params); err != nil {
		return fmt.Errorf("failed to get response: %w", err)
	}

	var response = n9m.CertificateVerificationRequest{
		S0: GenerateVerifyKey(params.S0),
	}

	pack.Payload.Operation = "VERIFY"
	pack.SetParameters(response)

	sPack.Write(pack.PackPackage())

	return
}

func handleVerify(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.CertificateVerificationResponse

	if err = pack.GetResponseAs(&params); err != nil {
		return fmt.Errorf("failed to get response: %w", err)
	}

	if params.ErrorCode == 0 {
		fmt.Println("ШАЛОСТЬ УДАЛАСЬ!")
	} else {
		fmt.Println("шалость НЕ удалась(((")
	}

	var request = n9m.CertificateLoginRequest{
		ClientID: 0,
		MAC:      "",
		User:     "admin",
		Password: "",
	}

	pack.Payload.Operation = "LOGIN"
	pack.SetParameters(request)

	sPack.Write(pack.PackPackage())

	return
}

func handleLogin(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.CertificateLoginResponse

	if err = pack.GetResponseAs(&params); err != nil {
		return fmt.Errorf("failed to get response: %w", err)
	}

	conn, err := net.Dial("tcp", "10.100.100.99:9006")

	var request = n9m.CertificateCreateStreamRequest{
		StreamName: "KRBL",
	}

	pack.Payload.Operation = "CREATESTREAM"
	pack.SetParameters(request)

	conn.Write(pack.PackPackage())

	go handle(conn, &videoPack)

	return
}

func handleCreateStream(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.CertificateCreateStreamResponse

	if err = pack.GetResponseAs(&params); err != nil {
		return fmt.Errorf("failed to get response: %w", err)
	}

	if params.ErrorCode != 0 {
		fmt.Println("Create stream error:", params.ErrorCode, params.ErrorCause)
		return
	}

	var request = n9m.MediaStreamModelRequestLiveVideoRequest{
		StreamName: "KRBL",
		StreamType: 2,
		Channel:    1,
		AudioValid: 1,
		FrameMode:  0,
	}

	pack.Payload.Module = "MEDIASTREAMMODEL"
	pack.Payload.Operation = "REQUESTALIVEVIDEO"
	pack.SetParameters(request)

	mainPack.Write(pack.PackPackage())

	return
}

func handleRequestLiveVideo(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.MediaStreamModelRequestLiveVideoResponse

	if err = pack.GetResponseAs(&params); err != nil {
		return fmt.Errorf("failed to get response: %w", err)
	}

	if params.ErrorCode != 0 {
		fmt.Println("Request live stream error:", params.ErrorCode, params.ErrorCause)
		return
	}

	return
}

func handleKeepAlive(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	serial := sPack.Storage["serial"]
	fmt.Println(serial, "still alive!")

	pack.SetResponse(nil)
	sPack.Write(pack.PackPackage())

	return
}

func handleGetConfig(sPack *n9m.SmartPackage, pack n9m.Package) (err error) {
	serial := sPack.Storage["serial"]

	os.WriteFile(fmt.Sprintf("./%s.json", serial), pack.RawPayload, 0644)

	var request n9m.ConfigModelSetRequest

	if err = pack.GetParametersAs(&request); err != nil {
		fmt.Println(err)
		return err
	}

	return
}

func handleUselessAlarms(sPack *n9m.SmartPackage, pack n9m.Package, response n9m.SendAlarmInfoResponse) (err error) {
	return nil
}

func handleVideoLossAlarm(sPack *n9m.SmartPackage, pack n9m.Package, response n9m.SendAlarmInfoResponse) (err error) {
	fmt.Println("Video loss alarm!")
	return nil
}

func handleCameraCoveredAlarm(sPack *n9m.SmartPackage, pack n9m.Package, response n9m.SendAlarmInfoResponse) (err error) {
	fmt.Println("Camera covered alarm!")
	return nil
}

func handleSPI(_ *n9m.SmartPackage, pack n9m.Package) (err error) {
	var params n9m.SpiParameters

	if err = pack.GetParametersAs(&params); err != nil {
		return
	}

	fmt.Printf("%+v\n", params)

	return
}

func createSmartPackage(conn net.Conn) (pack *n9m.SmartPackage) {
	pack = n9m.NewSmartPackage(conn)

	pack.AddPayloadHandler(n9m.PayloadTypeSpecial, handleSpecialPackages)

	pack.AddJSONHandler("CERTIFICATE", "CONNECT", handleCertificateConnect)
	pack.AddJSONHandler("CERTIFICATE", "VERIFY", handleVerify)
	pack.AddJSONHandler("CERTIFICATE", "LOGIN", handleLogin)
	pack.AddJSONHandler("CERTIFICATE", "CREATESTREAM", handleCreateStream)
	pack.AddJSONHandler("CERTIFICATE", "KEEPALIVE", handleKeepAlive)
	pack.AddJSONHandler("MEDIASTREAMMODEL", "REQUESTALIVEVIDEO", handleRequestLiveVideo)
	pack.AddJSONHandler("CONFIGMODEL", "GET", handleGetConfig)
	pack.AddJSONHandler("DEVEMM", "SPI", handleSPI)

	pack.AddAlarmHandler(n9m.AlarmTypeMotionDetection, handleUselessAlarms)

	pack.AddAlarmHandler(n9m.AlarmTypeVideoLoss, handleVideoLossAlarm)
	pack.AddAlarmHandler(n9m.AlarmTypeCameraCovered, handleCameraCoveredAlarm)

	return
}

/*
	go func() {
		pack := packS
		pack.Payload.Module = "EVEM"
		pack.Payload.Operation = "GALARMING"

		ticker := time.NewTicker(5 * time.Second)
		defer ticker.Stop()

		for range ticker.C {
			fmt.Println("Sent!")
			if _, err := conn.Write(pack.PackPackage()); err != nil {
				fmt.Println("Failed to send GALARMING:", err)
				return
			}
		}
	}()
*/

func isNetConnClosedErr(err error) bool {
	switch {
	case
		errors.Is(err, net.ErrClosed),
		errors.Is(err, io.EOF),
		errors.Is(err, syscall.EPIPE):
		return true
	default:
		return false
	}
}

func handle(conn net.Conn, pack **n9m.SmartPackage) {
	if pack != nil {
		*pack = createSmartPackage(conn)
	} else {
		tmp := createSmartPackage(conn)
		pack = &tmp
	}

	var err error
	for {
		if err = (*pack).Handle(); err != nil {
			fmt.Println("Error:", err)

			if isNetConnClosedErr(err) {
				return
			}
		}
	}
}