#!/bin/bash

# to make the script fail safely

set -euo pipefail

out=${1:-output}

echo -e "" > $out

echo -e "Below is the feedback for your submission collatz.scala" >> $out

echo -e "" >> $out

# compilation tests

function scala_compile {

  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala "$1" 2>> $out 1>> $out) 

}

# functional tests

function scala_assert {

  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -i "$1" -- "$2" -e "" 2> /dev/null 1> /dev/null)

}

# purity test

function scala_vars {

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

}

# var, .par return, ListBuffer test

#

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

if (scala_vars collatz.scala)

then

  echo -e "  --> FAIL (make triple-sure your program conforms to the required format)\n" >> $out

  tsts0=$(( 0 ))

else

  echo -e "  --> success" >> $out

  tsts0=$(( 0 )) 

fi

### compilation test

if  [ $tsts0 -eq 0 ]

then 

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

  if (scala_compile collatz.scala)

  then

    echo -e "  --> success" >> $out

    tsts=$(( 0 ))

  else

    echo -e "  --> SCALA DID NOT RUN COLLATZ.SCALA\n" >> $out

    tsts=$(( 1 )) 

  fi

else

  tsts=$(( 1 ))     

fi

### collatz tests

if [ $tsts -eq 0 ]

then

  echo -e "collatz.scala tests:" >> $out

  echo -e "  collatz(1) == 0" >> $out

  echo -e "  collatz(6) == 8" >> $out

  echo -e "  collatz(9) == 19" >> $out

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

  then

    echo -e "  --> success" >> $out

  else

    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out

  fi

fi

### collatz-max tests

if [ $tsts -eq 0 ]

then

  echo -e "  collatz_max(10) == (19, 9)" >> $out

  echo -e "  collatz_max(100) == (118, 97)" >> $out

  echo -e "  collatz_max(1000) == (178, 871)" >> $out

  echo -e "  collatz_max(10000) == (261, 6171)" >> $out

  echo -e "  collatz_max(100000) == (350, 77031)" >> $out

  echo -e "  collatz_max(1000000) == (524, 837799)" >> $out

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

  then

    echo -e "  --> success" >> $out

  else

    echo -e "  --> ONE OF THE TESTS FAILED\n" >> $out

  fi

fi