#!/usr/bin/env bash

quotes_cache_file="${HOME}/.cache/quotes.txt";
update_cache_every="1 day";

if [[ "$#" -lt "1" ]]; then
	echo -e "Quote generation tool"
	echo -e "By Starbeamrainbowlabs"
	echo -e ""
	echo -e "Downloads and caches a quote file and picks out a random quote."
	echo -e ""
	echo -e "Usage:"
	echo -e "    quote-get {quote-file-url}"
	exit 1;
fi

quotes_url="$1";

if [ ! -d "$(dirname "${quotes_cache_file}")" ]; then
	mkdir -p "${quotes_cache_file}";
fi

function download_quotes {
	#echo -ne "> Downloading quotes file - " 1>&2;
	curl -o "${quotes_cache_file}" -L ${quotes_url} 2>/dev/null;
	#echo -e "done" 1>&2;
}

# Download the quotes file if it doesn't exist already
if [ ! -f "${quotes_cache_file}" ]; then
	download_quotes;
fi

# Update the quotes file if it's out of date
oldest_allowed=$(date -d "now - ${update_cache_every}" +%s);
cache_filemtime=$(date -r "${quotes_cache_file}" +%s);

if (( $cache_filemtime <= $oldest_allowed )); then
	download_quotes;
fi

# Generate a quote
quote_count=$(cat "${quotes_cache_file}" | wc -l);

# Set the random number generator seed to ensure we give the same quote on a per-day basis
RANDOM=$(date +%Y%m%d);

quote_line=$((( $RANDOM % ${quote_count} )));

sed -n ${quote_line}p "${quotes_cache_file}";