package audio

import (
	"io"
	"os"
	"time"

	"github.com/tcolgate/mp3"
)

func GetSongDuration(path string) (time.Duration, error) {
	var file, fopenErr = os.Open(path)
	if fopenErr != nil {
		return time.Duration(0), fopenErr
	}
	defer file.Close()

	var track = mp3.NewDecoder(file)
	var duration time.Duration
	var frame mp3.Frame
	var skipped = 0

	for {
		var err = track.Decode(&frame, &skipped)
		if err != nil {
			if err == io.EOF {
				break
			}
			return time.Duration(0), err
		}

		duration += frame.Duration()
	}
	return duration, nil
}