#!/bin/bash

set -e
cd $(dirname $0)/..

if ! [ -x "$(command -v curl)" ]; then
  echo "Error: curl is not installed, but the setup script relies on it."
  echo "on debian based operating systems try following command:"
  echo "  $ sudo apt-get install curl"
  exit 1
fi

# load .env
if [ -f .env ]
then
  echo "Error: the configuration file .env already exists."
  echo "either edit variables manually in there or remove the file and try this script again"
  exit 1
fi


EXTERNAL_IPv4=$(curl -4 -s https://icanhazip.com)
EXTERNAL_IPv6=$(curl -6 -s https://icanhazip.com || true)

greenlight=""
while [[ ! $greenlight =~ ^(y|n)$ ]]; do
    read -p "Should greenlight be included? (y/n): " greenlight
done

https_proxy=""
while [[ ! $https_proxy =~ ^(y|n)$ ]]; do
    read -p "Should an automatic HTTPS Proxy be included? (y/n): " https_proxy
done

coturn=""
if [ "$https_proxy" == "y" ]
then
    while [[ ! $coturn =~ ^(y|n)$ ]]; do
        read -p "Should a coturn be included? (y/n): " coturn
    done
fi

DOMAIN=""
while [[ -z "$DOMAIN" ]]; do
    read -p "Please enter the domain name: " DOMAIN
done

ip_correct=""
while [[ ! $ip_correct =~ ^(y|n)$ ]]; do
    read -p "Is $EXTERNAL_IPv4 your external IPv4 address? (y/n): " ip_correct
done

if [ ! "$ip_correct" == "y" ]
then
    EXTERNAL_IPv4=""
    while [[ ! $EXTERNAL_IPv4 =~ ^[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}$ ]]; do
        read -p "Please enter correct IPv4 address: " EXTERNAL_IPv4
    done
fi

if [ -n "$EXTERNAL_IPv6" ]
then
    ip_correct=""
    while [[ ! $ip_correct =~ ^(y|n)$ ]]; do
        read -p "Is $EXTERNAL_IPv6 your external IPv6 address? (y/n): " ip_correct
    done

    if [ ! "$ip_correct" == "y" ]
    then
        EXTERNAL_IPv6=""
        while [[ ! $EXTERNAL_IPv6 =~ ^[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}\.[1-9][0-9]{0,2}$ ]]; do
            read -p "Please enter correct IPv6 address: " EXTERNAL_IPv6
        done
    fi
fi



# write settings
cp sample.env .env
sed -i "s/EXTERNAL_IPv4=.*/EXTERNAL_IPv4=$EXTERNAL_IPv4/" .env
sed -i "s/EXTERNAL_IPv6=.*/EXTERNAL_IPv6=$EXTERNAL_IPv6/" .env
sed -i "s/DOMAIN=.*/DOMAIN=$DOMAIN/" .env

if [ ! "$greenlight" == "y" ]
then
    sed -i "s/ENABLE_GREENLIGHT.*/#ENABLE_GREENLIGHT=true/" .env
fi

if [ ! "$https_proxy" == "y" ]
then
    sed -i "s/ENABLE_HTTPS_PROXY.*/#ENABLE_HTTPS_PROXY=true/" .env
fi

if [ "$coturn" == "y" ]
then
    sed -i "s/.*TURN_SERVER=.*/TURN_SERVER=turns:$DOMAIN:465?transport=tcp/" .env
    TURN_SECRET=$(head /dev/urandom | tr -dc A-Za-f0-9 | head -c 32)
    sed -i "s/.*TURN_SECRET=.*/TURN_SECRET=$TURN_SECRET/" .env
    sed -i "s/.*STUN_IP=.*/STUN_IP=$EXTERNAL_IPv4/" .env
else
    sed -i "s/ENABLE_COTURN.*/#ENABLE_COTURN=true/" .env
fi

# change secrets
RANDOM_1=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 40)
RANDOM_2=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 40)
RANDOM_3=$(head /dev/urandom | tr -dc a-f0-9 | head -c 128)
sed -i "s/SHARED_SECRET=.*/SHARED_SECRET=$RANDOM_1/" .env
sed -i "s/ETHERPAD_API_KEY=.*/ETHERPAD_API_KEY=$RANDOM_2/" .env
sed -i "s/RAILS_SECRET=.*/RAILS_SECRET=$RANDOM_3/" .env

echo "--------------------------------------------------"
echo "configuration file .env got successfully created!"
echo ""
echo "you can look through it for further adjusments"
echo "  $ nano .env"
echo ""
echo "to start bigbluebutton run"
echo "  $ ./scripts/compose up -d"