package game

import java.io.File
import java.util.Scanner
import scala.collection.mutable.ArrayBuffer

/** Handles read/write from/to Disk.
  * Reading uses java.util.Scanner
  * Writing uses java.io
  */
object Disk {

  def loadLines() = {
    val fromFile = new File("score.txt" )
    val result: ArrayBuffer[String] = new ArrayBuffer[String](0)
    val scanner = new Scanner(fromFile)
    while(scanner.hasNextLine) {
      val line = scanner.nextLine
      if (!(line eq "")){
        result.append(line)
      }
    }
    result.toVector
  }

  def personalScore(name: String) = {
    loadAllResults().filter(_._1 equals name)
  }

  def loadAllResults() = {
    val output = loadLines().map(str => {
      val data = str.split(',')
      (data(0),data(1), data(2))
    })
    output.sortBy(_._2.toInt).reverse
  }

  def appendResult(playerName: String, points: Int, time: Int, fileName: String) = {
    saveString("", "score.txt")
    val fullString = (loadLines() :+ (s"$playerName,$points,$time")).mkString("\n")
    saveString(fullString, fileName)
  }

  /** Save `text` to a text file called `fileName`. */
  private def saveString(text: String, fileName: String): Unit = {
    val f = new java.io.File(fileName)
    val pw = new java.io.PrintWriter(f, "UTF-8")
    try pw.write(text) finally pw.close()
  }
}