#!/bin/bash

# to make the script fail safely

set -euo pipefail

out=${1:-output}

echo "" > $out

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

echo "" >> $out

# compilation tests

function scala_compile {

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

}

# functional tests

function scala_assert {

  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -nc -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 "danube.scala does not contain vars, returns etc?" >> $out

if (scala_vars danube.scala)

then

  echo "  --> fail (make triple-sure your program conforms to the required format)" >> $out

  tsts0=$(( 0 ))

else

  echo "  --> success" >> $out

  tsts0=$(( 0 )) 

fi

### compilation test

if  [ $tsts0 -eq 0 ]

then 

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

  if (scala_compile danube.scala)

  then

    echo "  --> success" >> $out

    tsts=$(( 0 ))

  else

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

    tsts=$(( 1 )) 

  fi

else

  tsts=$(( 1 ))     

fi

### danube get_cvs_url tests

if [ $tsts -eq 0 ]

then

  echo "danube.scala tests:" >> $out

  echo "  val movies_url = \"\"\"https://nms.kcl.ac.uk/christian.urban/movies.csv\"\"\"" >> $out

  echo "  get_csv_url(movies_url).length == 9742" >> $out

  if (scala_assert "danube.scala" "danube_test1.scala")

  then

    echo "  --> success" >> $out

  else

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

  fi

fi

### danube processing tests

if [ $tsts -eq 0 ]

then

  echo "  val good_ratings = process_ratings(ratings)" >> $out

  echo "  val movie_names = process_movies(movies)" >> $out  

  echo "  " >> $out

  echo "  good_ratings.length == 48580 " >> $out

  echo "  movie_names.length == 9742 " >> $out

  if (scala_assert "danube.scala" "danube_test2.scala") 

  then

    echo "  --> success" >> $out

  else

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

  fi

fi