package main

import (
	"encoding/json"
	"fmt"
	"io"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/nsqio/go-nsq"
)

var Error *log.Logger
var Warning *log.Logger

func init() {
	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
	logFile, err := os.Create("main.log")
	if err != nil {
		log.Printf("Error creating log file: %v", err)
		os.Exit(1)
	}
	logger := io.MultiWriter(os.Stdout, logFile)
	log.SetOutput(logger)

	Error = log.New(io.MultiWriter(logFile, os.Stderr, os.Stdout),
		fmt.Sprintf("%sERROR:%s ", "\033[0;101m", "\033[0m"),
		log.Lmicroseconds|log.Lshortfile)
	Warning = log.New(io.MultiWriter(logFile, os.Stdout),
		fmt.Sprintf("%sWarning:%s ", "\033[0;93m", "\033[0m"),
		log.Lmicroseconds|log.Lshortfile)
}

const DOWNLOAD_WORKERS = 4

type DLHandler struct{}

func (*DLHandler) HandleMessage(message *nsq.Message) error {
	log.Printf("Received message '%s' with %d attempts", message.Body, message.Attempts)
	data := DownloadRequest{}
	err := json.Unmarshal(message.Body, &data)
	if err != nil {
		Error.Printf("Error unmarshalling message: %v", err)
		return err
	}
	log.Printf("Downloading %s", data.Link)
	err = Download(data.Link)
	if err != nil {
		Error.Printf("Error downloading %s: %v", data.Link, err)
		return err
	}
	message.Finish()
	return nil
}

func main() {
	config := nsq.NewConfig()
	config.MaxAttempts = 5
	config.MaxInFlight = DOWNLOAD_WORKERS
	config.MsgTimeout = 10 * time.Second

	consumer, err := nsq.NewConsumer("ytdqueue", "dl", config)
	if err != nil {
		Error.Printf("Error creating consumer: %v", err)
		return
	}
	for i := 0; i < DOWNLOAD_WORKERS; i++ {
		consumer.AddHandler(&DLHandler{})
	}

	err = consumer.ConnectToNSQD("nsq.site.quack-lab.dev:41505")
	if err != nil {
		Error.Printf("Error connecting to nsqlookupd: %v", err)
		return
	}

	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	<-sigChan
	log.Println("Received signal to terminate. Initiating graceful shutdown...")

	consumer.Stop()
	<-consumer.StopChan

	log.Println("Graceful shutdown completed.")
}