#!/bin/bash
scriptname=$( basename "$0" )
is_running=$( pgrep -c "$scriptname" )
if (( $is_running > 1 )) ; then
    >&2 echo $scriptname is running.
    exit 0
fi
if [ -z $1 ]
    then purity=100  #safe for work
    LOCATION="/path/to/dir/"
    else purity=011 # nsfr
    LOCATION="/path/to/dir/"
fi
if [ ! -d "$LOCATION" ] ; then mkdir -p "$LOCATION" ; fi
cd "$LOCATION" || exit
function WGET {
    userAgent="Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) "
    userAgent+="Gecko/20100101 Firefox/48.0"
    wget -q -U "$userAgent" --keep-session-cookies \
        --save-cookies=cookies.txt --load-cookies=cookies.txt "$@"
}
# login :
USER="wallhaven user name"
PASS='*******wallhaven password'
WGET --referer=https://alpha.wallhaven.cc https://alpha.wallhaven.cc/auth/login
token="$(grep 'name="_token"' login | sed 's:.*value="::' | sed 's/.\{2\}$//')"
WGET --referer=https://alpha.wallhaven.cc/auth/login \
     --post-data="_token=$token&username=$USER&password=$PASS" \
     https://alpha.wallhaven.cc/auth/login
#query url
s1="search?page=1&categories=101&purity=$purity&"
s1+="resolutions=1920x1080&ratios=&sorting=random&order=desc"
#get page
WGET --referer=https://alpha.wallhaven.cc -O tmp  "https://alpha.wallhaven.cc/$s1"
#get image id and download it
imgID="$(grep -o 'th-[0-9]*' tmp | sed  's .\{3\}  ' | head -1)"
 ! WGET --referer=https://alpha.wallhaven.cc/wallpaper/"$imgID" \
        https://wallpapers.wallhaven.cc/wallpapers/full/wallhaven-$imgID.jpg &&
 ! WGET --referer=https://alpha.wallhaven.cc/wallpaper/"$imgID" \
        https://wallpapers.wallhaven.cc/wallpapers/full/wallhaven-$imgID.png
rm -f cookies.txt login login.1 tmp
data=$(stat "$PWD/wallhaven-$imgID.jpg" 2>/dev/null)
filesize=$(echo "$data" | awk 'NR==2{print $2}')
if [ -z $filesize ] ; then filesize=0 ; fi
if (( $filesize == 0 ))
    then
        rm -f "$PWD/wallhaven-$imgID.jpg"
        >&2 echo "empty image removed"
    else
        touch "$PWD/wallhaven-$imgID.jpg"
        echo "$PWD/wallhaven-$imgID.jpg"
fi