#!/bin/sh

echo 'Loggin in'
curl -b cookies -c cookies -s -F 'email=ChristianLupus@web.de' -F 'form_id=packt_user_login_form' -F 'password=naitsirhc' -F 'op=Login' https://www.packtpub.com/ > /dev/null

echo 'Obtaining free book information'
url=$(curl -b cookies -c cookies -s https://www.packtpub.com/packt/offers/free-learning | grep freelearning-claim | grep -o 'href="[^"]*' | grep -o '/free.*')

echo 'Claiming free book'
curl -b cookies -c cookies https://www.packtpub.com$url

opwd=$(pwd)
if [ $# -eq 1 ]; then
	mkdir -p "$1"
	cd "$1"
else
	mkdir -p downloads
	cd downloads
fi

echo 'Downloading books'
id=$(echo $url | grep -o '/[0-9/]*/' | grep -o '[0-9]*')
name=$(curl -b "$opwd/cookies" -c "$opwd/cookies" -sI https://www.packtpub.com/ebook_download/$id/pdf | grep 'Location' | grep -Eo 'https?://[^?]*' | sed 's@.*/@@' | sed 's@\.pdf@@i' )
echo $name
out=$(curl -b "$opwd/cookies" -c "$opwd/cookies" -L https://www.packtpub.com/ebook_download/$id/pdf https://www.packtpub.com/ebook_download/$id/epub -o "$name.pdf" -o "$name.epub" 2>&1 )

ret=$?

cd "$opwd"

echo 'Logging off'
curl -b cookies -c cookies -s https://www.packtpub.com/logout > /dev/null

if [ $ret -ne 0 ]; then
	
	if [ $ret -eq 23 ]; then
		echo Could not write file to file system:
	fi
	
	echo -e "$out"
	
fi