if [ $(netstat -lp 2> /dev/null | grep 3000 | wc -l) -gt 0 ]
then
    echo "Port 3000 already in use by $(netstat -lp 2> /dev/null | grep 3000 | awk '{print $7}')"
    exit
fi

mkdir top-apps 2> /dev/null
mkdir top-apps/apps 2> /dev/null
cd top-apps

echo "This app depends on nodejs, jq, git, pip and protobuf."
echo "Additionally it also requires two git repos."
echo "Make sure to double check the dependencies before installing."

read -r -p "Install dependencies? [y/N] " response
if [[ "$response" =~ ^([yY][eE][sS]|[yY])+$ ]]
then

    echo "Installing nodejs, jq and git..."
    curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash - # change to setup_6.x if needed
    sudo apt-get install -y nodejs jq git python-setuptools # jq is used for json processing

    echo "Installing pip..."
    sudo easy_install pip

    echo "Installing protobuf..."
    sudo pip install protobuf

    echo "Installing nodejs module to scrap app data from google play.."
    npm install google-play-scraper

    echo "Cloning web-api.."
    git clone https://github.com/facundoolano/google-play-api.git web-api

    echo "Cloning python api... (allows downloads)"
    git clone https://github.com/egirault/googleplay-api py-api

    echo "Installing the web-api..."
    cd web-api
    npm install
    cd ..
fi

if [ -z "$ANDROID_ID" ]; then read -r -p "ANDROID ID: " ANDROID_ID; fi
if [ -z "$GOOGLE_LOGIN" ]; then read -r -p "GOOGLE LOGIN: " GOOGLE_LOGIN; fi
unset GOOGLE_PASSWORD
set +a #avoid exporting
read -rsp "GOOGLE PASSWORD: " GOOGLE_PASSWORD
echo ""

echo "import sys" > py-api/config.py
echo "SEPARATOR = \";\"" >> py-api/config.py
echo "LANG = \"en_US\"" >> py-api/config.py
echo "ANDROID_ID = \"$ANDROID_ID\"" >> py-api/config.py
echo "GOOGLE_LOGIN = \"$GOOGLE_LOGIN\"" >> py-api/config.py
echo "GOOGLE_PASSWORD = sys.stdin" >> py-api/config.py
echo "AUTH_TOKEN = None" >> py-api/config.py

cd web-api
npm start & # starts the Node.js web server and respective REST API
WEB_API_PID=$! #stores the process id to kill later
echo "Web-api pid $WEB_API_PID"
cd ..

while [ $(netstat -lp 2> /dev/null | grep 3000 | wc -l) -lt 1 ]
do
   echo "Waiting for web api boot..."
   sleep 1
done

echo "Downloading top apps json..."
wget localhost:3000/api/apps -O top.json

echo "Downloading apps from json..."
cat top.json | jq -r '.results | .[] | .appId' | xargs -I {} sh -c "printf \"%s\n\" \"$GOOGLE_PASSWORD\" | python py-api/download.py {} apps/{}.apk" # printf output does not show on ps

echo "Killing web api..."
kill $WEB_API_PID

echo "Done"