#!/usr/bin/env bash
# vim: set ts=4 sw=4
exec 2>&1

if test -d lock
then
	echo "Already running"
	exit 1 # trap goes below in order not to remove the lock
else
	mkdir lock
fi

temp=$(mktemp "$1.XXXX")
temp2=$(mktemp "$1.XXXX")

trap "rm -vrf $temp $temp2 lock" EXIT

umask 002

if ! test "$1"
then
	printf "Please specify twitter username\ne.g. %s kaihendry\n" $0
	exit 1
fi

page=1
saved=0

test -s "$1.txt.gz" && gunzip "$1.txt.gz"

if test -s "$1.txt"
then
	saved=$(wc -l < "$1.txt")
	since='&since_id='$(head -n1 "$1.txt" | cut -d'|' -f1)
	test "$2" && since='&max_id='$(tail -n1 $1.txt | cut -d'|' -f1) # use max_id to get older tweets
fi

while urlargs="screen_name=${1}&count=200&page=${page}${since}&include_rts=1&trim_user=0"; echo $urlargs; $(dirname $0)/oauth.php $urlargs |
$(dirname $0)/json-to-text.php > $temp2; test $(wc -l < $temp2) -gt 0;
do

#cat temp2

if test -f $1.txt
then
	mv $1.txt $temp
	before=$(wc -l < "$temp")
else
	before=0
	> $temp
fi

sort -r -n -u $temp $temp2 > "$1.txt"
rm -f $temp $temp2

after=$(wc -l < "$1.txt")

echo Before: $before After: $after

page=$(($page + 1))
saved=$(wc -l < "$1.txt")

done

echo $1 saved $saved tweets

test -L "$1.txt.gz" && rm "$1.txt.gz"
gzip -v "$1.txt"
ln -sfv "$1.txt.gz" tweets.txt.gz
stat -L tweets.txt 2>/dev/null || rm -f tweets.txt