#!/bin/bash
# A quick and dirty flashcard script, for learning Toki Pona vocab
# open to all for anything, tfurrows@sdf.org
#
# create a text file with one entry per line, word:definition
# the script will randomly choose a word and give you multiple
# options. Choose the correct one; the script lets you know if
# you got it right or not, and shows you the correct answer.
#
# color is optionally disabled with -c at the end

if [ "$#" -lt "1" ]; then
	echo "Usage: flashcard.sh <filename.txt> [-c]"
	exit 1
fi
if [ ! -f "$1" ]; then
	echo "The file \"$1\" does not exist."
	exit 1
fi
if [ "$2" != "-c" ]; then
	color_yellow='\033[1;33m'
	color_green='\033[0;32m'
	color_cyan='\033[0;36m'
	color_red='\033[0;31m'
	color_nc='\033[0m'
fi

readarray flashcards < $1
lastcard=$((${#flashcards[@]}-1))

while [ "$guess" != "q" ]; do
	multichoice=($(shuf -i 0-119 -n 4))
	choiceorder=($(shuf -i 0-3 -n 4))

	IFS=":" read -ra testcard <<< "${flashcards[${multichoice[0]}]}"

	echo -e "\n [${color_yellow}${testcard[0]}${color_nc}] \n"

	c=0
	for i in "${choiceorder[@]}"; do
		IFS=":" read -ra mixcard <<< "${flashcards[${multichoice[$i]}]}"
		echo "$c) ${mixcard[1]}"
		if [ "${testcard[1]}" == "${mixcard[1]}" ]; then
			answer="$c"
		fi
		((c++))
	done

	echo -n "Answer:"
	read -n1 guess

	if [ "$answer" == "$guess" ]; then
		echo -e "\n${color_green}Correct.${color_nc}"
	else
		echo -e "\n${color_red}Incorrect.${color_nc}"
	fi
	echo -e "${color_cyan}${testcard[0]} : ${testcard[1]}${color_nc}"
done