// Package srt serves a SRT server
package srt

import (
	"log"

	"github.com/haivision/srtgo"
	"gitlab.crans.org/nounous/ghostream/messaging"
)

func handleStreamer(socket *srtgo.SrtSocket, streams *messaging.Streams, name string) {
	// Create stream
	stream, err := streams.Create(name)
	if err != nil {
		log.Printf("Error on stream creating: %s", err)
		socket.Close()
		return
	}

	// Create source quality
	q, err := stream.CreateQuality("source")
	if err != nil {
		log.Printf("Error on quality creating: %s", err)
		socket.Close()
		return
	}

	// Create sub-qualities
	for _, qualityName := range []string{"audio", "480p", "360p", "240p"} {
		_, err := stream.CreateQuality(qualityName)
		if err != nil {
			log.Printf("Error on quality creating: %s", err)
			socket.Close()
			return
		}
	}

	log.Printf("New SRT streamer for stream '%s' quality 'source'", name)

	// Read RTP packets forever and send them to the WebRTC Client
	for {
		// Create a new buffer
		// UDP packet cannot be larger than MTU (1500)
		buff := make([]byte, 1500)

		// 5s timeout
		n, err := socket.Read(buff, 5000)
		if err != nil {
			log.Println("Error occurred while reading SRT socket:", err)
			break
		}

		if n == 0 {
			// End of stream
			log.Printf("Received no bytes, stopping stream.")
			break
		}

		// Send raw data to other streams
		buff = buff[:n]
		q.Broadcast <- buff
	}

	// Close stream
	streams.Delete(name)
	socket.Close()
}

func handleViewer(socket *srtgo.SrtSocket, streams *messaging.Streams, name string) {
	// Get requested stream
	stream, err := streams.Get(name)
	if err != nil {
		log.Printf("Failed to get stream: %s", err)
		socket.Close()
		return
	}

	// Get requested quality
	// FIXME: make qualities available
	qualityName := "source"
	q, err := stream.GetQuality(qualityName)
	if err != nil {
		log.Printf("Failed to get quality: %s", err)
		socket.Close()
		return
	}
	log.Printf("New SRT viewer for stream %s quality %s", name, qualityName)

	// Register new output
	c := make(chan []byte, 1024)
	q.Register(c)
	stream.IncrementClientCount()

	// Receive data and send them
	for data := range c {
		if len(data) < 1 {
			log.Print("Remove SRT viewer because of end of stream")
			break
		}

		// Send data
		_, err := socket.Write(data, 1000)
		if err != nil {
			log.Printf("Remove SRT viewer because of sending error, %s", err)
			break
		}
	}

	// Close output
	q.Unregister(c)
	stream.DecrementClientCount()
	socket.Close()
}