#!/bin/bash

# to make the script fail safely

set -euo pipefail

out=${1:-output}

echo "" > $out

echo "Below is the feedback for your submission" >> $out

echo "" >> $out

# compilation tests

function scala_compile {

  (ulimit -t 30 -m 1024000 ; scala "$1" 2> $out 1> $out) 

}

# functional tests

function scala_assert {

  (ulimit -t 30 -m 1024000 ; scala -i "$1" "$2" -e "" 2> /dev/null 1> /dev/null)

}

# purity test

function scala_vars {

   (egrep '\bvar\b|\breturn\b|\.par|ListBuffer|mutable' "$1" 2> /dev/null 1> /dev/null)

}

# var, .par return, ListBuffer test

#

echo "collatz.scala does not contain vars, returns etc?" >> $out

if (scala_vars collatz.scala)

then

  echo "  --> fail" >> $out

  tsts0=$(( 1 ))

else

  echo "  --> yes" >> $out

  tsts0=$(( 0 )) 

fi

### compilation test

if  [ $tsts0 -eq 0 ]

then 

  echo "collatz.scala runs?" >> $out

  if (scala_compile collatz.scala)

  then

    echo "  --> success" >> $out

    tsts=$(( 0 ))

  else

    echo "  --> scala did not run collatz.scala" >> $out

    tsts=$(( 1 )) 

  fi

else

  tsts=$(( 1 ))     

fi

### collatz tests

if [ $tsts -eq 0 ]

then

  echo "  collatz(1) == 0,1 or 4" >> $out

  echo "  collatz(6) == 9" >> $out

  echo "  collatz(9) == 20" >> $out

  if (scala_assert "collatz.scala" "collatz_test1.scala")

  then

    echo "  --> success" >> $out

  else

    echo "  --> one of the tests failed" >> $out

  fi

fi

### collatz-max tests

if [ $tsts -eq 0 ]

then

  echo "  collatz_max(10) == (9, 20)" >> $out

  echo "  collatz_max(100) == (97, 119)" >> $out

  echo "  collatz_max(1000) == (871, 179)" >> $out

  echo "  collatz_max(10000) == (6171, 262)" >> $out

  echo "  collatz_max(100000) == (77031, 351)" >> $out

  echo "  collatz_max(1000000) == (837799, 525)" >> $out

  if (scala_assert "collatz.scala" "collatz_test2.scala") 

  then

    echo "  --> success" >> $out

  else

    echo "  --> one of the tests failed" >> $out

  fi

fi