#!/usr/bin/env bash
#==============================================================#
#
# AUTHOR:
#     Bryan Jenks
#         - www.bryanjenks.xyz
#         - https://github.com/tallguyjenks/flash.sh
#
# SOURCE:
#     This file is based off of the one presented in this YouTube Video by nixcasts:
#         - https://www.youtube.com/watch?v=lX8jqo70r1I
#
# PURPOSE:
#     To have a command line flash card tool with minimal code, plain text input and output
#
# VISION:
#     The goal i have for this script is a basic level emulation of ANKI to where i have a way to
#     keep track of a score for each item in each selected deck so that it can pick from a selection
#     of the lowest scoring items and shuf them to the user for reenforcement of active recall.
#
# DEPENDENCIES:
#     fzf - https://github.com/junegunn/fzf
#     bat - https://github.com/sharkdp/bat
#==============================================================#

DIR_MADE_MSG="
Your '~/.local/share/flash' directory has been made and
your 'deck.csv' file is ready for you to enter your flashcard data
"
PWD="$(pwd)" # Remember User's Starting Directory
DIR="$HOME/.local/share/flash" # Where Decks Are Located
COUNTER=0
NO_DECKS="
No decks were found, please make a new deck
using ':' as a delimiter in a '.csv' file in
the '.local/share/flash' directory.
"
TEMPLATE_DECK="$HOME/.local/share/flash/deck.csv"

if [ ! -d $DIR ];then # If Directory does NOT exist
    echo "No '.local/share/flash' directory, make it? y/n"
    read RESPONSE
        case "$RESPONSE" in
            n) exit ;;
            N) exit ;;
            q) exit ;;
            Q) exit ;;
            y) mkdir $DIR && touch $TEMPLATE_DECK && echo "category1:question1:answer1" >> $TEMPLATE_DECK && echo "category2:question2:answer2" >> $TEMPLATE_DECK && echo "category3:question3:answer3" >> $TEMPLATE_DECK && echo "$DIR_MADE_MSG" ;;
            Y) mkdir $DIR && touch $TEMPLATE_DECK && echo "category1:question1:answer1" >> $TEMPLATE_DECK && echo "category2:question2:answer2" >> $TEMPLATE_DECK && echo "category3:question3:answer3" >> $TEMPLATE_DECK && echo "$DIR_MADE_MSG" ;;
            *) echo "invalid choice, please select either 'y' or 'n'" ;;
        esac
fi

cd "$DIR"

if [ "$(find -maxdepth 999 -iname "*.csv" | wc -l)" = 0 ]; then
    echo "$NO_DECKS" && cd "$PWD" && exit
fi

# Show pretty FZF preview of decks using BAT
DECK="$(find -maxdepth 999 -iname "*.csv" | fzf --preview='bat --theme="Solarized (dark)" --style=numbers --color=always {} | head -500')"

main(){
    IFS=$':'; read -a q <<<$(shuf -n 1 "$DECK")
    if [ $COUNTER -gt 0 ]; then # If not the first flash card then pause before screen clearing
        read _
    fi
    clear
    echo "===================================================="
    echo "Cards Reviewed: $COUNTER"
    echo "Category: ${q[0]}"
    echo "Question: ${q[1]}"
    echo ''
    read -sn 1 NEXT
    if [ "$NEXT" = q ]; then
        cd "$PWD"
        exit
    fi
    echo "Answer: ${q[2]}"
    echo ''
    echo "===================================================="
    COUNTER="$(($COUNTER+1))"
}

while true; do
        main
done