package app

import (
	"bytes"
	"context"
	"encoding/json"
	"flag"
	"os"
	"os/signal"
	"syscall"

	cml04eventer "git.espin.casa/albert/cml04-eventer"
	"git.espin.casa/albert/cml04-plb018/internal/logging"
	"git.espin.casa/albert/cml04-plb018/internal/server"
	"git.espin.casa/albert/cml04-plb018/internal/service"
	"git.espin.casa/albert/cml04-plb018/internal/storage"
	"git.espin.casa/albert/cml04-plb018/internal/types"
	"git.espin.casa/albert/logger"
)

func Run() error {
	// flags
	httpBind := flag.String("bind-addr", ":3000", "http bind address")
	nsqAddr := flag.String("nsq-addr", "10.1.152.13", "nsq address")
	nsqPort := flag.Int("nsq-port", 4150, "nsq port")
	logLevel := flag.String("level", "debug", "Log level")
	flag.Parse()
	// setup logger
	log := logger.New(os.Stdout, *logLevel)
	// log fields
	logFields := logger.LogFields{
		"http_bind": *httpBind,
		"nsq_addr":  *nsqAddr,
		"nsq_port":  *nsqPort,
		"log_level": *logLevel,
	}
	// create subscriber
	sub, err := cml04eventer.NewSubscriber(&cml04eventer.SubscriberConfig{
		NSQAddress:  *nsqAddr,
		NSQPort:     *nsqPort,
		Unmarshaler: cml04eventer.JSONMarshaler{},
		Channel:     "CML04-PLB018",
	}, log)
	if err != nil {
		log.Error("create subscriber failed", err, logFields)
		return err
	}
	defer sub.Close()
	// create publisher
	pub, err := cml04eventer.NewPublisher(&cml04eventer.PublisherImplConfig{
		NSQAddress: *nsqAddr,
		NSQPort:    *nsqPort,
		Marshaler:  cml04eventer.JSONMarshaler{},
	}, log)
	if err != nil {
		log.Error("create publisher failed", err, logFields)
	}
	defer pub.Close()
	// create context
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	// subscribe events
	SapChan, err := sub.SubscribeEvent(ctx, "SAP-IN")
	if err != nil {
		log.Error("create subscribe event failed", err, logFields)
		return err
	}
	// create storage
	storage, err := storage.NewStorage(log)
	if err != nil {
		log.Error("create storage event failed", err, logFields)
		return err
	}
	// process incoming events
	go func() {
		for event := range SapChan {
			if err := ProcessEvent(ctx, event, storage, log); err != nil {
				log.Error("process event has been failed", err, logFields)
				continue
			}
		}
	}()
	// create service
	svc := service.NewService(storage, pub)
	// create logging service
	svc = logging.NewLogging(svc, log)
	// create server
	server := server.NewServer(*httpBind, svc)
	// start server
	server.Start()
	// info banner
	log.Info("started cml04-pbl018", logFields)
	// wait signal to finish
	signal := WaitSignal()
	log.Info("signal received", logFields.Add(logger.LogFields{
		"signal": signal.String(),
	}))
	return nil
}

func ProcessEvent(ctx context.Context, event *cml04eventer.Event, storage storage.Storager, log logger.LoggerAdapter) error {
	subject, err := event.EventMeta.Get("subject")
	if err != nil {
		return err
	}
	switch subject.(string) {
	// production order telegram
	case "sap.in.telegramas.z_sms_10001":
		log.Info("received production order data from SAP", logger.LogFields{})
		po := &types.ProductionOrder{}
		buf := bytes.NewBuffer(event.EventData)
		if err := json.NewDecoder(buf).Decode(po); err != nil {
			return err
		}
		return storage.SalvarOrdenProduccion(ctx, po)
	//  customer order telegram
	case "sap.in.telegramas.z_sms_10002":
		log.Info("received customer order data from SAP", logger.LogFields{})
		co := &types.CustomerOrder{}
		buf := bytes.NewBuffer(event.EventData)
		if err := json.NewDecoder(buf).Decode(co); err != nil {
			return err
		}
		return storage.SalvarOrdenCliente(ctx, co)
	case "sap.in.calidades":
		log.Info("received normas/calidades data from SAP", logger.LogFields{})
		list := &types.NormaList{}
		buf := bytes.NewBuffer(event.EventData)
		if err := json.NewDecoder(buf).Decode(list); err != nil {
			return err
		}
		return storage.SalvarNormas(ctx, list)
	}
	return nil
}

// WaitSignal catching exit signal
func WaitSignal() os.Signal {
	ch := make(chan os.Signal, 2)
	signal.Notify(
		ch,
		syscall.SIGINT,
		syscall.SIGQUIT,
		syscall.SIGTERM,
	)
	for {
		sig := <-ch
		switch sig {
		case syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM:
			return sig
		}
	}
}