/src/main/scala/dk/mehmedbasic/audiobook/conversion/ConverterFactory.scala

package dk.mehmedbasic.audiobook.conversion

import java.io.{FileInputStream, BufferedInputStream, File}
import javazoom.jl.decoder.{Header, Bitstream}


/**
 * A factory for creating converters.
 *
 * @author Jesenko Mehmedbasic
 *         created 19-01-13, 14:21
 */
class ConverterFactory(inputFile: File, finishListener: (String, File) => Unit) {

  val conversionType: ConversionType = ConversionType.Joining

  def determineConfig(file: File): AudioConfig = {
    try {
      val sourceStream: BufferedInputStream = new BufferedInputStream(new FileInputStream(file))
      val stream: Bitstream = new Bitstream(sourceStream)
      val header: Header = stream.readFrame

      val channels = if ((header.mode == Header.SINGLE_CHANNEL)) {
        1
      } else {
        2
      }

      stream.close()
      AudioConfig(channels, header.frequency())
    } catch {
      case e: Exception => {
        throw new RuntimeException(e)
      }
    }
  }

  def createConverter(): Runnable = {
    val config: AudioConfig = determineConfig(inputFile)
    val inputAudio: AudioFile = new AudioFile(inputFile, config)

    new JoiningAudioConverter(inputAudio, config, finishListener)
  }
}