#!/bin/bash

echo "----> Starting Download of all LEGO instructions from https://brickset.com/exportscripts/instructions"
firstline=0
logfile="lego_errors.log"
downloadFolder="Instructions"
#error_level: 
#	0 no errors reported
#	1 Download errors reported
#	2 Existing files and download errors reported

error_level=1

echo "" > $logfile
if [ -f "instructions" ]; then
	echo "---> Using existing instructions file. Manually delete it to redownload..."
else 
	echo -ne "---> Downloading csv from Brickset..."
	wget https://brickset.com/exportscripts/instructions &> /dev/null  
	if [[ "$?" != 0 ]]; then
		echo "Error... Exiting!"
		exit; 
	else
		echo "Done!" 
	fi
fi
while IFS=, read -r ID LINK NAME DESC ADDED RETRIVED
do
	if [ "$firstline" = 0 ]; then
		firstline=1
	else
		#echo "I got:$ID - $LINK - $NAME - $DESC - $ADDED - $RETRIVED"
		
		tID=$(sed -e 's/^"//' -e 's/"$//' <<<"$ID")
		tLINK=$(sed -e 's/^"//' -e 's/"$//' <<<"$LINK")
		tNAME=$(sed -e 's/^"//' -e 's/"$//' <<<"$NAME")
		tADDED=$(sed -e 's/^"//' -e 's/"$//' <<<"$ADDED")
		tDESC=$(sed -e 's/^"//' -e 's/"$//' <<<"$DESC")
		filename=$tID"_"${tNAME// /_}"_("${tDESC// /_}")_"$tADDED".pdf"
		if [ -f "$downloadFolder/$filename" ]; then
			echo "-> $tID exists. Skipping..."
			if [[ $error_level = 2 ]]; then
				echo "$filename exists." >> $logfile
			fi 	
		else
			if [[ "$tDESC" = "{No longer listed at LEGO.com}" ]] ; then
				echo "-> $tID is not available. Skipping..."
				if [[ $error_level = 1 || $error_level = 2 ]]; then
					echo "$filename is not available." >> $logfile
				fi
			else  
				echo -ne "--> $tID downloading now..."
				curl -H "Mozilla/5.0 (platform; rv:75.0) Gecko/20100101 Firefox/75.0" $tLINK --silent --output "Instructions/$filename"
				if [ -f "$downloadFolder/$filename" ]; then
					echo "Done!"
				else
					echo "ERROR!"
					echo "--> Not downloaded. Try again manually..."
					if [[ $error_level = 1 || $error_level = 2 ]]; then  
						echo "$filename was not downloaded. Check CURL" >> $logfile
					fi
				fi
				#random sleep in order to not look like a script
				sleep $(( ( RANDOM % 10 )  + 1 ))
			fi
		fi
	fi
	
done < instructions