#!/bin/bash

# Dependencies: cut wget convert (imagemagic) openssl curl
# "error.log" will list all download and convert errors

# Set time file for sorting text
downloadtemp="/tmp/$(echo "$0" | rev | cut -d'/' -f1 | rev).$(openssl rand -hex 10).txt"
sortingtemp="/tmp/$(echo "$0" | rev | cut -d'/' -f1 | rev).$(openssl rand -hex 10).txt"
underscore="_"		# Underscores are a vlaid character for variable names which messes up some of the naming. This is a dirty fix.

# Follow given url to final destination
url=$(curl -s -L -I -o /dev/null -w '%{url_effective}' "$1")

toonname=$(echo $url | cut -d'/' -f6)
episodeno=$(echo $url | cut -d'=' -f3)
eipsodename=$(echo $url | cut -d'/' -f7)
pictureno=0
mkdir -p "$toonname/temp"

wget --quiet -O "$downloadtemp" "$url"
if [ ! $? -eq 0 ]; then
  echo -e "Error:\tURL: $url\t(404? This may not be an issue, check the output.)" >> "$toonname/error.log"
  exit 1
fi

grep 'rel="nofollow" ondragstart="return false;" onselectstart="return false;" oncontextmenu="return false;"' "$downloadtemp" > "$sortingtemp"

echo -e "\nChapter URL: $url"

while read i; do
  pictureno=$((pictureno+1))
  imageurl=$(echo "$i" | cut -d'"' -f12 | cut -d'?' -f1)	# Cut out the indervidual image urls
  wget --no-verbose --tries=6 --user-agent='Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0' --referer="http://www.webtoons.com/" $imageurl -O "$toonname/temp/$toonname$underscore$(printf %03d $episodeno)_$(printf %03d $pictureno).jpg" || echo "URL: $imageurl Name:$toonname/temp/$toonname$underscore$(printf %03d $episodeno)_$(printf %03d $pictureno).jpg" >> "$toonname/error.log"
done < "$sortingtemp"

# Remove the last image if it is the webtoon logo
mv "$toonname/temp/$toonname$underscore$(printf %03d $episodeno)_$(printf %03d $pictureno).jpg" "$toonname/temp/logo/$toonname$underscore$(printf %03d $episodeno)_$(printf %03d $pictureno).jpg"

# Don't bother doint this, as this will often result in an image larger than image magic can handle
#convert -quality 95 -append "$toonname/temp/$toonname$underscore$(printf %03d $episodeno)*.jpg" "$toonname/$toonname$underscore$(printf %03d $episodeno)_$eipsodename.jpg" || echo -e "convert.im6 error: Input: $toonname/temp/$toonname$underscore$(printf %03d $episodeno)\*.jpg\tOutput: $toonname/$toonname$underscore$(printf %03d $episodeno)_$eipsodename.jpg\tURL: $url" >> "$toonname/error.log"

# Remove temp file
rm "$sortingtemp" "$downloadtemp"