package main

import (
	"embed"
	"flag"
	"io/fs"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"

	"imuslab.com/remdeskvm/remdeskd/mod/remdeshid"
	"imuslab.com/remdeskvm/remdeskd/mod/usbcapture"
)

const development = true

var (
	usbKVMDeviceName  = flag.String("usbkvm", "/dev/ttyUSB0", "USB KVM device file path")
	usbKVMBaudRate    = flag.Int("baudrate", 115200, "USB KVM baud rate")
	captureDeviceName = flag.String("capture", "/dev/video0", "Video capture device file path")
	usbKVM            *remdeshid.Controller
	videoCapture      *usbcapture.Instance
)

/* Web Server Static Files */
//go:embed www
var embeddedFiles embed.FS
var webfs http.FileSystem

func init() {
	// Initiate the web server static files
	if development {
		webfs = http.Dir("./www")
	} else {
		// Embed the ./www folder and trim the prefix
		subFS, err := fs.Sub(embeddedFiles, "www")
		if err != nil {
			log.Fatal(err)
		}
		webfs = http.FS(subFS)
	}

	// Initiate the HID controller
	usbKVM = remdeshid.NewHIDController(&remdeshid.Config{
		PortName: *usbKVMDeviceName,
		BaudRate: *usbKVMBaudRate,
	})

}

func main() {
	//Start the HID controller
	err := usbKVM.Connect()
	if err != nil {
		log.Fatal(err)
	}

	// Initiate the video capture device
	videoCapture, err = usbcapture.NewInstance(&usbcapture.Config{
		DeviceName: *captureDeviceName,
	})

	if err != nil {
		log.Fatalf("Failed to create video capture instance: %v", err)
	}

	//Get device information for debug
	usbcapture.PrintV4L2FormatInfo(*captureDeviceName)

	//Start the video capture device
	err = videoCapture.StartVideoCapture(&usbcapture.CaptureResolution{
		Width:  1920,
		Height: 1080,
		FPS:    25,
	})
	if err != nil {
		log.Fatal(err)
	}

	// Handle program exit to close the HID controller

	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
	go func() {
		<-c
		log.Println("Shutting down usbKVM...")
		//usbKVM.Close() //To fix close stuck layer
		log.Println("Shutting down capture device...")
		videoCapture.Close()
		os.Exit(0)
	}()

	// Start the web server
	http.Handle("/", http.FileServer(webfs))
	http.HandleFunc("/hid", usbKVM.HIDWebSocketHandler)
	http.HandleFunc("/stream", videoCapture.ServeVideoStream)
	addr := ":9000"
	log.Printf("Serving on http://localhost%s\n", addr)
	log.Fatal(http.ListenAndServe(addr, nil))

}