#!/bin/bash

# to make the script fail safely

set -euo pipefail

out=${1:-output}

echo "" > $out

echo `date` >> $out

echo >> $out

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

echo "for the Preliminary Part of Assignment 6.  Please note all marks are provisional until" >> $out

echo "ratified by the assessment board -- this is not an official" >> $out

echo "results transcript." >> $out

echo "" >> $out

echo "The feedback for your submission for collatz.scala" >> $out

echo "" >> $out

# marks for CW6 basic part 

marks=$(( 0 ))

# compilation tests

function scala_compile {

  (ulimit -t 60; JAVA_OPTS="-Xmx1g" scala "$1" 2> /dev/null 1> /dev/null)

}

# functional tests

function scala_assert {

  (ulimit -t 60; JAVA_OPTS="-Xmx1g" scala -i "$1" -- "$2" 2> /dev/null 1> /dev/null)

}

# purity test

function scala_vars {

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

}

# var, .par return, ListBuffer test

#

echo "collatz.scala does not contain vars, return etc?" | tee -a $out

if (scala_vars collatz.scala)

then

  echo "  --> test failed" | tee -a $out

  tsts0=$(( 1 ))

else

  echo "  --> success" | tee -a $out

  tsts0=$(( 0 )) 

fi

### compilation test

if  [ $tsts0 -eq 0 ]

then 

  echo "collatz.scala runs?" | tee -a $out

  if (scala_compile collatz.scala)

  then

    echo "  --> success" | tee -a $out

    tsts=$(( 0 ))

  else

    echo "  --> scala collatz.scala did not run successfully" | tee -a $out

    tsts=$(( 1 )) 

  fi

else

  tsts=$(( 1 ))     

fi

echo >> $out

### collatz tests

if [ $tsts -eq 0 ]

then

  echo "collatz.scala tests:" | tee -a $out

  echo "  collatz(1) == 0" | tee -a $out

  echo "  collatz(6) == 8" | tee -a $out

  echo "  collatz(9) == 19" | tee -a $out

  echo "  collatz(9000) == 47" | tee -a $out

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

  then

      echo "  --> success" | tee -a $out

  else

    echo "  --> one of the tests failed" | tee -a $out

  fi

fi

### collatz-max tests

if [ $tsts -eq 0 ]

then

  echo "  collatz_max(10) == (19, 9)" | tee -a $out

  echo "  collatz_max(100) == (118, 97)" | tee -a $out

  echo "  collatz_max(1000) == (178, 871)" | tee -a $out

  echo "  collatz_max(10000) == (261, 6171)" | tee -a $out

  echo "  collatz_max(100000) == (350, 77031)" | tee -a $out

  echo "  collatz_max(1000000) == (524, 837799)" | tee -a $out

  #  echo "  collatz_max(2) == (1, 2) || collatz_max(2) == (0, 1)" | tee -a $out

  echo "  collatz_max(2) == (1, 2)" | tee -a $out

  echo "  collatz_max(77000) == (339, 52527)" | tee -a $out

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

  then

      echo "  --> success" | tee -a $out

      marks=$(( marks + 1 ))

  else

    echo "  --> one of the tests failed" | tee -a $out

  fi

fi

## final marks

echo >> $out

echo " $marks" | tee -a $out