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#!/usr/bin/env bash
#
# Bash dbwebb module for asserting and auto correcting labs.
#
# It reads the answers from files in a directory
# for checking with assertEqual().
#
ANSWERS=".answer"
PROMPT=">>> "


#
# Init by reading file with answers.
#
LAB_answers=$( cat "$ANSWERS/summary.total" )
LAB_correct=0
LAB_failed=0
LAB_notDone=0

LAB_mypoints=0
LAB_points=$LAB_answers
if [ -f "$ANSWERS/summary.points" ]; then
    LAB_points=$( cat "$ANSWERS/summary.points" )
fi

LAB_pass=$LAB_points
if [ -f "$ANSWERS/summary.pass" ]; then
    LAB_pass=$( cat "$ANSWERS/summary.pass" )
fi

LAB_distinct=-1 # -1 to disable
if [ -f "$ANSWERS/summary.passdistinct" ]; then
    LAB_distinct=$( cat "$ANSWERS/summary.passdistinct" )
fi



#
# Assert if equal with expected answer.
# Check if the answer is correct or not, present a hint if asked for.
#
# question, answer, hint
#
function assertEqual
{
    local question=$1
    local hint=$2
    local noanswer="Replace this text with the variable holding the answer."
    local answer=$( cat "$ANSWERS/$question" )
    local points=1
    
    if [ -f "$ANSWERS/$question.points" ]; then
        points=$( cat "$ANSWERS/$question.points" )
    fi

    if [ "$ANSWER" = "$noanswer" ]; then
        echo "${PROMPT}$question NOT YET DONE. (${points}p)"
        ((LAB_notDone++))
    
    elif [ $ANSWER = $answer ]; then
        printf "%s%s CORRECT. Well done! (%sp)\n%s\n" "$PROMPT" "$question" $points "$ANSWER"
        ((LAB_correct++))
        LAB_mypoints=$((LAB_mypoints + points))
    
    else
        printf "%s%s FAIL. ($sp)\n%sYou said:\n%s\n" "$PROMPT" "$question" "$PROMPT" $points "$ANSWER"
        if $hint; then
            printf "%sHint:\n%s\n" "$PROMPT" $answer
        fi
        ((LAB_failed++))
    fi
}



#
# Exit with a summary.
# Print a exit message with the result of all tests.
# Exit with status 0 if all tasks are solved, else exit with status 1.
#
function exitWithSummary
{
    local green='\[\031[0;32m\]'

    printf "%sDone with status %d/%d/%d/%d (Total/Correct/Failed/Not done).\n" "$PROMPT" $LAB_answers $LAB_correct $LAB_failed $LAB_notDone
    
    printf "%sPoints earned: %sp of %sp (PASS=>%sp" "$PROMPT" $LAB_mypoints $LAB_points $LAB_pass
    if [ $LAB_distinct -ne -1 ]; then
        printf ", PASS W DISTINCTION=>%sp" $LAB_distinct
    fi
    printf ").\n"

    # Grading
    if [ $LAB_distinct -ne -1 -a $LAB_mypoints -ge $LAB_distinct ]; then
        printf "\e[0;36m%sGrade: PASS WITH DISTINCTION!!! :-D\e[m\n" "$PROMPT"
    elif [ $LAB_mypoints -ge $LAB_pass ]; then
        printf "\e[0;32m%sGrade: PASS! :-)\e[m\n" "$PROMPT"
    else
        printf "\e[1;33m%sGrade: NO PASS. :-|\e[m\n" "$PROMPT"
    fi

    exit $(( $LAB_mypoints >= $LAB_pass ? 0 : 42 ))
}