#!/bin/sh
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# Name:
# Desc:
# Reqs:
# Date:
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FRENCH_CARDS="♣♚ ♣♛ ♣♝ ♠♚ ♠♛ ♠♝ ♢♔ ♢♕ ♢♗ ♡♔ ♡♕ ♡♗ 🃏 🃏"
FRENCH_SUITS="♣ ♢ ♡ ♠"
FRENCH_SUIT_CARDS="A 2 3 4 5 6 7 8 9 10"


usage() {
	echo "usage: $(basename "$0") [-h] [-d DECK_PREFIX] DIRECTORY"
	echo
	echo "$(basename "$0") creates a directory representing a card-deck."
	echo 'That is, it creates empty files representing the decks’ cards,'
	echo 'with the files’ names corresponding to their card in the deck.'
	echo
	echo '  -d             specify the deck-prefix to use'
	echo '  -h             print this message and exit'
	echo
	echo 'A deck-prefix is the name of the deck, and determines the'
	echo 'variables that will be used to determine the deck’s cards.'
	echo 'For instance, if the deck-prefix is FRENCH — the deck'
	echo 'hard-coded echo "into $(basename "$0") — then the variables'
	echo 'FRENCH_CARDS, FRENCH_SUITS, and FRENCH_SUIT_CARDS will be used.'
	echo
	echo '$NAME_CARDS contains a space-delimited list of strings of raw'
	echo 'card-names, like: “♣♚ ♢♔ 🃏”'
	echo '$NAME_SUITS contains a list of suits, like: “♣ ♡”'
	echo '$NAME_SUIT_CARDS containts a list of cards each suit has, for'
	echo 'example: “1 2 3 4”'
    echo
	echo 'You can define a deck simply using $NAME_CARDS, or you can use'
    echo '$NAME_SUITS and $NAME_SUITS_CARDS to help reduce repetiton on'
    echo 'your part. Substitute “NAME” with your preferred deck-name.'
}


shell_sanitize() {
	local str="$1"
	echo "$1" \
		| tr -d '$(){}`'
}


suit_cards() {
	local name="$(shell_sanitize "$1")"
	local suits="$(eval "echo \$${name}_SUITS")"
	local suit_cards="$(eval "echo \$${name}_SUIT_CARDS")"

	for suit in $suits; do
		for suit_card in $suit_cards; do
			printf "${suit}${suit_card} "
		done
	done

	eval "echo \$${name}_CARDS"
}


mkdeck_dir() {
	local dir="$1"

	if test ! -d "$dir"; then
		mkdir "$dir"
	fi
	if test ! -d "$dir"; then
		1>&2 echo "Failed to create deck directory at $dir."
		exit 2
	fi
}


mkdeck_cards() {
	local dir="$1"
	local deck_name="$2"
	local cards="$(suit_cards "$deck_name")"

	if test -z "$cards"; then
		1>&2 echo "No cards found for deck $deck_name. Check your environment variables:"
		1>&2 echo "${deck_name}_CARDS, ${deck_name}_SUITS, and ${deck_name}_SUIT_CARDS."
		exit 3
	fi

	for card in $cards; do
		touch "${dir}/${card}"
	done
}


mkdeck() {
	local dir="$1"
	local deck_name="$2"
	mkdeck_dir "$dir"
	mkdeck_cards "$dir" "$deck_name"
}


DECK="$FRENCH"
while getopts 'hd:' arg; do
	case $arg in
		h)
			usage
			exit 0
			;;
		d)
			DECK="$OPTARG"
			;;
	esac
done

shift $((OPTIND-1))

CARD_DIR="$1"

if test -z "$CARD_DIR"; then
	usage 1>&2
	exit 4
fi

mkdeck "$CARD_DIR" "$DECK"