Comparing input with a string in Shell Script

Hello i'm making a sh script with parameters. I need that the user insert 1 parameter and use this in order to run scrapy istance.

#!/bin/sh
# sh yahooscraper.sh 

if [ -z "$1"]
then
    echo "ERROR you must enter one arg related to the Yahoo URL DB "
else
    if ["$1" = "-h"]
    then
        echo "msg"
    else
    echo "Reading from $1 database "
    cd yahooquestionscraper/yahooscraper/yahooscraper/spiders
    scrapy crawl yahoo -o yahoo-url-file.json -a database_name=$1
    fi
fi

This script works in the first case, when user don't choose any parameter and in the second else. But don't work in the if ["$1" = "-h"] condition.