// Copyright 2018 Open Networking Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"github.com/opencord/device-management/demo_test/proto"
	"bufio"
	"bytes"
	"crypto/tls"
	"fmt"
	"github.com/Shopify/sarama"
	log "github.com/sirupsen/logrus"
	"golang.org/x/net/context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/status"
	"net"
	"net/http"
	"os"
	"os/exec"
	"os/signal"
	"strconv"
	"strings"
)

var REDFISH_ROOT = "/redfish/v1"
var CONTENT_TYPE = "application/json"
var EVENTS_MAP = map[string]string{
	"add":    "ResourceAdded",
	"rm":     "ResourceRemoved",
	"alert":  "Alert",
	"update": "Update"}

var default_address string = "localhost:31085"
var importerTopic = "importer"
var DataConsumer sarama.Consumer

var cc importer.DeviceManagementClient
var ctx context.Context
var conn *grpc.ClientConn

func GetCurrentDevices() (error, []string) {
	fmt.Println("Testing GetCurrentDevices\n")
	empty := new(importer.Empty)
	var ret_msg *importer.DeviceListByIp
	ret_msg, err := cc.GetCurrentDevices(ctx, empty)
	if err != nil {
		return err, nil
	} else {
		return err, ret_msg.Ip
	}
}

func init() {
	Formatter := new(log.TextFormatter)
	Formatter.TimestampFormat = "02-01-2006 15:04:05"
	Formatter.FullTimestamp = true
	log.SetFormatter(Formatter)
}

func topicListener(topic *string, master sarama.Consumer) {
	log.Info("Starting topicListener for ", *topic)
	consumer, err := master.ConsumePartition(*topic, 0, sarama.OffsetOldest)
	if err != nil {
		log.Error("topicListener panic, topic=[%s]: %s", *topic, err.Error())
		os.Exit(1)
	}
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, os.Interrupt)
	doneCh := make(chan struct{})
	go func() {
		for {
			select {
			case err := <-consumer.Errors():
				log.Error("Consumer error: %s", err.Err)
			case msg := <-consumer.Messages():
				log.Info("Got message on topic=[%s]: %s", *topic, string(msg.Value))
			case <-signals:
				log.Warn("Interrupt is detected")
				os.Exit(1)
			}
		}
	}()
	<-doneCh
}

func kafkainit() {
	cmd := exec.Command("/bin/sh", "kafka_ip.sh")
	var kafkaIP string
	var out bytes.Buffer
	cmd.Stdout = &out
	err := cmd.Run()
	if err != nil {
		log.Info(err)
		os.Exit(1)
	}

	kafkaIP = out.String()
	kafkaIP = strings.TrimSuffix(kafkaIP, "\n")
	kafkaIP = kafkaIP + ":9092"
	fmt.Println("IP address of kafka-cord-0:", kafkaIP)
	config := sarama.NewConfig()
	config.Consumer.Return.Errors = true
	master, err := sarama.NewConsumer([]string{kafkaIP}, config)
	if err != nil {
		panic(err)
	}
	DataConsumer = master

	go topicListener(&importerTopic, master)
}
func main() {
	http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
	fmt.Println("Launching server...")
	log.Info("kafkaInit starting")
	kafkainit()

	ln, err := net.Listen("tcp", ":9999")
	if err != nil {
		fmt.Println("could not listen")
		log.Fatal("did not listen: %v", err)
	}
	defer ln.Close()

	connS, err := ln.Accept()
	if err != nil {
		fmt.Println("Accept error")
		log.Fatal("Accept error: %v", err)
	}
	conn, err = grpc.Dial(default_address, grpc.WithInsecure())
	if err != nil {
		fmt.Println("could not connect")
		log.Fatal("did not connect: %v", err)
	}
	defer conn.Close()

	cc = importer.NewDeviceManagementClient(conn)
	ctx = context.Background()

	loop := true

	for loop == true {
		cmdstr, _ := bufio.NewReader(connS).ReadString('\n')
		cmdstr = strings.TrimSuffix(cmdstr, "\n")
		s := strings.Split(cmdstr, " ")
		newmessage := ""
		cmd := string(s[0])

		switch cmd {

		case "attach" :
			if len(s) < 2 {
				newmessage = newmessage + "invalid command " + cmdstr + "\n"
				break
			}
			var devicelist importer.DeviceList
			var ipattached []string
			for _, devinfo := range s[1:] {
				info := strings.Split(devinfo, ":")
				if len(info) != 3 {
					newmessage = newmessage + "invalid command " + devinfo + "\n"
					continue
				}
				deviceinfo := new(importer.DeviceInfo)
				deviceinfo.IpAddress = info[0] + ":" + info[1]
				freq, err := strconv.ParseUint(info[2], 10, 32)
				if (err != nil) {
					newmessage = newmessage + "invalid command " + devinfo + "\n"
					continue
				}
				deviceinfo.Frequency = uint32(freq)
				devicelist.Device = append(devicelist.Device, deviceinfo)
				ipattached = append(ipattached, deviceinfo.IpAddress)
			}
			_, err := cc.SendDeviceList(ctx, &devicelist)
			if err != nil {
				errStatus, _ := status.FromError(err)
				newmessage = newmessage + errStatus.Message() + "\n"
				fmt.Printf("attach error - status code %v message %v", errStatus.Code(), errStatus.Message())
			} else {
				ips := strings.Join(ipattached, " ")
				newmessage = newmessage + ips + " attached\n"
			}
		case "delete" :
			if len(s) < 2 {
				newmessage = newmessage + "invalid command " + cmdstr + "\n"
				break
			}
			var devicelist importer.DeviceListByIp
			for _, ip := range s[1:] {
				devicelist.Ip = append(devicelist.Ip, ip)
			}
			_, err := cc.DeleteDeviceList(ctx, &devicelist)
			if err != nil {
				errStatus, _ := status.FromError(err)
				newmessage = newmessage + errStatus.Message() + "\n"
				fmt.Printf("delete error - status code %v message %v", errStatus.Code(), errStatus.Message())
			} else {
				ips := strings.Join(devicelist.Ip, " ")
				newmessage = newmessage + ips + " deleted\n"
			}
		case "period" :
			if len(s) != 2 {
				newmessage = newmessage + "invalid command " + cmdstr + "\n"
				break
			}
			args := strings.Split(s[1], ":")
			if len(args) != 3 {
				newmessage = newmessage + "invalid command " + s[1] + "\n"
				break
			}
			ip := args[0] + ":" + args[1]
			pv := args[2]
			u, err := strconv.ParseUint(pv, 10, 64)
			if err != nil {
				fmt.Print("ParseUint error!!\n")
			} else {
				freqinfo := new(importer.FreqInfo)
				freqinfo.Frequency = uint32(u)
				freqinfo.IpAddress = ip
				_, err := cc.SetFrequency(ctx, freqinfo)

				if err != nil {
					errStatus, _ := status.FromError(err)
					newmessage = newmessage + errStatus.Message()
					fmt.Printf("period error - status code %v message %v", errStatus.Code(), errStatus.Message())
				} else {
					newmessage = newmessage + "data collection interval configured to " + pv + " seconds\n"
				}
			}
		case "sub", "unsub":
			if len(s) != 2 {
				newmessage = newmessage + "invalid command " + cmdstr + "\n"
				break
			}
			args := strings.Split(s[1], ":")
			if len(args) < 3 {
				newmessage = newmessage + "invalid command " + s[1] + "\n"
				break
			}
			giveneventlist := new(importer.GivenEventList)
			giveneventlist.EventIpAddress = args[0] + ":" + args[1]
			for _, event := range args[2:] {
				if value, ok := EVENTS_MAP[event]; ok {
					giveneventlist.Events = append(giveneventlist.Events, value)
				}
			}
			var err error
			if cmd == "sub" {
				_, err = cc.SubsrcribeGivenEvents(ctx, giveneventlist)
			} else {
				_, err = cc.UnSubsrcribeGivenEvents(ctx, giveneventlist)
			}
			if err != nil {
				errStatus, _ := status.FromError(err)
				newmessage = newmessage + errStatus.Message()
				fmt.Printf("Un/subscribe error - status code %v message %v", errStatus.Code(), errStatus.Message())
			} else {
				newmessage = newmessage + cmd +  " successful\n"
			}
		case "showeventlist":
			if len(s) != 2 {
				newmessage = newmessage + "invalid command " + s[1] + "\n"
				break
			}
			currentdeviceinfo := new(importer.Device)
			currentdeviceinfo.IpAddress = s[1]
			ret_msg, err := cc.GetEventList(ctx, currentdeviceinfo)
			if err != nil {
				errStatus, _ := status.FromError(err)
				newmessage = errStatus.Message()
				fmt.Printf("showeventlist error - status code %v message %v", errStatus.Code(), errStatus.Message())
			} else {
				fmt.Print("showeventlist ", ret_msg.Events)
				newmessage = strings.Join(ret_msg.Events[:], ",")
			}
		case "showdeviceeventlist":
			if len(s) != 2 {
				newmessage = newmessage + "invalid command " + s[1] + "\n"
				break
			}
			currentdeviceinfo := new(importer.Device)
			currentdeviceinfo.IpAddress = s[1]
			ret_msg, err := cc.GetCurrentEventList(ctx, currentdeviceinfo)
			if err != nil {
				errStatus, _ := status.FromError(err)
				fmt.Printf("showdeviceeventlist error - status code %v message %v", errStatus.Code(), errStatus.Message())
				newmessage = newmessage + errStatus.Message()
			} else {
				fmt.Print("showdeviceeventlist ", ret_msg.Events)
				newmessage = strings.Join(ret_msg.Events[:], ",")
			}
		case "cleardeviceeventlist":
			if len(s) != 2 {
				newmessage = newmessage + "invalid command " + s[1] + "\n"
				break
			}
			currentdeviceinfo := new(importer.Device)
			currentdeviceinfo.IpAddress = s[1]
			_, err := cc.ClearCurrentEventList(ctx, currentdeviceinfo)
			if err != nil {
				errStatus, _ := status.FromError(err)
				newmessage = newmessage + errStatus.Message()
				fmt.Printf("cleardeviceeventlist error - status code %v message %v", errStatus.Code(), errStatus.Message())
			} else {
				newmessage = newmessage + currentdeviceinfo.IpAddress + " events cleared\n"
			}
		case "QUIT":
			loop = false
			newmessage = "QUIT"

			case "showdevices":
				cmd_size := len(s)
				fmt.Print("cmd is :", cmd, cmd_size)
				if cmd_size > 2 || cmd_size < 0 {
					fmt.Print("error event !!")
					newmessage = "error event !!"
				} else {
					err, currentlist := GetCurrentDevices()

					if err != nil {
						errStatus, _ := status.FromError(err)
						fmt.Println(errStatus.Message())
						fmt.Println(errStatus.Code())
						newmessage = errStatus.Message()
						fmt.Print("showdevices error!!")
					} else {
						fmt.Print("showdevices ", currentlist)
						newmessage = strings.Join(currentlist[:], ", ")
					}
				}
		default:
			newmessage = newmessage + "invalid command " + cmdstr + "\n"
		}
			// send string back to client
		connS.Write([]byte(newmessage + "\n"))
	}
}