package media

import (
	"github.com/creack/pty"
	"golang.org/x/term"
	"io"
	"os"
	"os/exec"
	"os/signal"
	"syscall"
)

func Watch(path string) {
	cmd := exec.Command("mpv", "--osd-fractions", "--term-osd=force", path)
	ptmx, err := pty.Start(cmd)

	if err != nil {
		panic(err)
	}
	// Make sure to close the pty at the end.
	defer func() { ptmx.Close() }() // Best effort.

	// Handle pty size.
	ch := make(chan os.Signal, 1)
	signal.Notify(ch, syscall.SIGWINCH)
	go func() {
		for range ch {
			pty.InheritSize(os.Stdin, ptmx)
		}
	}()
	ch <- syscall.SIGWINCH                        // Initial resize.
	defer func() { signal.Stop(ch); close(ch) }() // Cleanup signals when done.

	// Set stdin in raw mode.
	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
	if err != nil {
		panic(err)
	}
	defer func() { term.Restore(int(os.Stdin.Fd()), oldState) }() // Best effort.

	// Copy stdin to the pty and the pty to stdout.
	// NOTE: The goroutine will keep reading until the next keystroke before returning.
	go func() { io.Copy(ptmx, os.Stdin) }()
	io.Copy(os.Stdout, ptmx)
}