#!/bin/sh

# If notify-send is not found, use echo as notifier
command -v "notify-send" > /dev/null && notifier="echo" || notifier="notify-send"

# check dependencies
for prog in dmenu jq nomacs wget curl; do
	! command -v "$prog" > /dev/null && 
        $notifier "redyt" "Error: Program '$prog' not found." && exit 1
done

# set dirs
cachedir="${XDG_CACHE_HOME:-$HOME/.cache}/redyt"
configdir="${XDG_CONFIG_HOME:-$HOME/.config}/redyt"

# if dirs do not exist, create them
[ ! -d "$cachedir" ] && mkdir -p "$cachedir"
[ ! -d "$configdir" ] && mkdir -p "$configdir"

# remove all cached images
rm "${cachedir:?}"/*

# set defaults
defaultsub="memes"
[ -f "$configdir/subreddits" ] || echo "$defaultsub" > "$configdir/subreddits"
limit=100
# select sorting (default: sort by hot)
# sorting=$(printf "hot\nnew\n" | dmenu -p "Select Sorting" -i -l 10)
# [ -z "$sorting" ] && 
sorting="hot"

# when no argument given, use dmenu to ask for subreddit
if [ -z "$1" ]; then
	subreddit=$(dmenu -p "Select Subreddit r/" -i -l 10 < \
        "$configdir/subreddits" | cut -d\| -f1 | awk '{$1=$1;print}')

	# if no subreddit was chosen, exit
	[ -z "$subreddit" ] && exit 1
else
	subreddit="$1"
fi


# send a notification
$notifier "Redyt" "📩 Downloading your 🖼️ Memes"

# download the subreddit feed, containing only the first 100 entries (limit),
# and store it inside $cachedir/tmp.json
curl -H "User-agent: 'your bot 0.1'" \
    "https://www.reddit.com/r/$subreddit/$sorting.json?limit=$limit" \
    > "$cachedir/tmp.json"

# get a list of images
imgs="$(jq '.' < "$cachedir/tmp.json" | grep url_overridden_by_dest | \
    grep -Eo "http(s|)://.*(jpg|png)\b" | sort -u)"

# if there are no images, exit
[ -z "$imgs" ] && $notifier "Redyt" \
    "sadly, there are no images for subreddit $subreddit, " \
    "please try again later!" && exit 1

# set welcome img
cp "$configdir/redyt.png" "$cachedir"

# download + display images in cache dir
wget -bq -P "$cachedir" "$imgs" > /dev/null 2> /dev/null
devour nomacs "$cachedir/redyt.png" & #> /dev/null 2> /dev/null