package soundbox

import (
	"context"
	"fmt"
	"os/exec"
	"net"
)

// streamingPort is the default network port a soundbox is listening to for
// incoming audio stream data.
const streamingPort = 5316

// StreamURLContext streams audio from a given URL to one or multiple soundbox
// devices. The devices are referenced via their MAC addresses given by the
// targets argument. The ctx argument is passed to cancel the streaming.
func StreamURLContext(ctx context.Context, url string, targets []net.HardwareAddr) error {
	iface, err := getInterface()
	if err != nil {
		return err
	}

	cmd := []string{
		"-re",
		"-i",
		url,
	}

	for _, target := range targets {
		ip, err := toLinkLocal(target)
		if err != nil {
			return err
		}

		cmd = append(cmd, "-acodec")
		cmd = append(cmd, "flac")
		cmd = append(cmd, "-f")
		cmd = append(cmd, "ogg")
		cmd = append(cmd, fmt.Sprintf(
			"tcp://[%s%%%s]:%d",
			ip,
			iface.Name,
			streamingPort,
		))
	}

	return exec.CommandContext(ctx, "ffmpeg", cmd...).Run()
}