syntax error: "then" unexpected (expecting "done") - Chinaunix

#!/bin/bash
while true
do
SPACE=`df|grep /dev/sda |awk '{print $5}'|sed 's/%//'`
if[ $SPACE -ge 80 ]
then
YEAR=`ls -l /mnt/share/data/vdr/data | tail +1 |awk '{print $9}'|awk '{print substr($0,1,4)}'`
MONTH=`ls -l /mnt/share/data/vdr/data |tail +1 |awk '{print $9}'|awk '{print substr($0,5,2)}'`
DAY=`ls -l /mnt/share/data/vdr/data | tail +1 | awk '{print $9}'|awk '{print substr($0,7,2)}'`
HOUR=00
MINUTE=00
SECOND=00
value1=-
value2=:
value3=" "
value=${YEAR}${value1}${MONTH}${value1}${DAY}${value3}${HOUR}${value2}${MINUTE}${value2}${SECOND}
echo $value
HAHA=`date -d "${value}" +%s`
echo $HAHA
for file in /mnt/share/data/vdr/data/*
do
echo $file >> /mnt/share/data/vdr/data/file.txt
thr_time=259200
YEAR1=`awk '{print substr($0,26,4)}' file.txt`
MONTH1=`awk '{print substr($0,30,2)}' file.txt`
DAY1=`awk '{print substr($0,32,2)}' file.txt`
HOUR1=00
MINUTE1=00
SECOND1=00
value11=-
value12=:
value13=" "
value_=${YEAR1}${value11}${MONTH1}${value11}${DAY1}${value13}${HOUR1}${value12}${MINUTE1}${value12}${SECOND1}
HEHE=`date -d "${value_}" +%s`
RES=$((HAHA-HEHE))
if [ $RES -ge $thr_time ]
then
rm -rf $file
else
echo safe_data
fi
rm file.txt
done
sleep 600
done
fi
done
exit 0

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