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package com.malliina.audio.run

import java.nio.file.{Files, Path, Paths}

import com.malliina.audio.javasound.{FileJavaSoundPlayer, JavaSoundPlayer}
import com.malliina.storage.{StorageInt, StorageSize}
import com.malliina.util.Utils

object Main {
  type ErrorMessage = String
  val noTrack = "Please specify a path to an MP3 as a command line parameter."

  case class Conf(path: Path, size: StorageSize)

  def main(args: Array[String]): Unit = {
    val maybePath = args.headOption
      .fold[Either[ErrorMessage, Path]](Left(noTrack))(validate)
    val maybeStorage = args.tail.headOption.map(parseSize).getOrElse(Right(JavaSoundPlayer.DefaultRwBufferSize))
    val maybeConf = for {
      path <- maybePath.right
      size <- maybeStorage.right
    } yield Conf(path, size)
    maybeConf.fold(println, play)
  }

  def play(conf: Conf) = {
    val size = conf.size
    println(s"Playing with buffer size: $size.")
    val player = new FileJavaSoundPlayer(conf.path, conf.size)
    player.play()
  }

  def parseSize(input: String): Either[ErrorMessage, StorageSize] = {
    Utils.optionally[StorageSize, NumberFormatException](input.toInt.bytes).left.map(_ => s"Not a number: $input")
  }

  def validate(input: String): Either[ErrorMessage, Path] = {
    val path = Paths get input
    val absolute = path.toAbsolutePath
    if (!Files.exists(absolute)) Left(s"File does not exist: $absolute.")
    else if (!Files.isReadable(absolute)) Left(s"File is not readable: $absolute.")
    else Right(absolute)
  }
}