#!/bin/bash

# Based on: https://gist.github.com/normandmickey/3f10fc077d15345fb469034e3697d0d0

# command info
if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "-help" ]; then
  echo "config script to switch BTCPay Server on or off"
  echo "bonus.btcpayserver.sh [on|off|menu|write-tls-macaroon] [ip|tor]"
  exit 1
fi

source /mnt/hdd/raspiblitz.conf
# get cpu architecture
source /home/admin/raspiblitz.info

if [ "$1" = "status" ]; then
  if [ "${BTCPayServer}" = "on" ]; then
    echo "installed=1"

    localIP=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d'/')
    echo "localIP='${localIP}'"
    echo "httpsPort='23001'"
    echo "publicIP='${publicIP}'"

    # check for LetsEnryptDomain for DynDns
    error=""
    source <(sudo /home/admin/config.scripts/blitz.subscriptions.ip2tor.py ip-by-tor $publicIP)
    if [ ${#error} -eq 0 ]; then
      echo "publicDomain='${domain}'"
    fi

    sslFingerprintIP=$(openssl x509 -in /mnt/hdd/app-data/nginx/tls.cert -fingerprint -noout 2>/dev/null | cut -d"=" -f2)
    echo "sslFingerprintIP='${sslFingerprintIP}'"

    toraddress=$(sudo cat /mnt/hdd/tor/btcpay/hostname 2>/dev/null)
    echo "toraddress='${toraddress}'"

    sslFingerprintTOR=$(openssl x509 -in /mnt/hdd/app-data/nginx/tor_tls.cert -fingerprint -noout 2>/dev/null | cut -d"=" -f2)
    echo "sslFingerprintTOR='${sslFingerprintTOR}'"

    # check for IP2TOR
    error=""
    source <(sudo /home/admin/config.scripts/blitz.subscriptions.ip2tor.py ip-by-tor $toraddress)
    if [ ${#error} -eq 0 ]; then
      echo "ip2torType='${ip2tor-v1}'"
      echo "ip2torID='${id}'"
      echo "ip2torIP='${ip}'"
      echo "ip2torPort='${port}'"
      # check for LetsEnryptDomain on IP2TOR
      error=""
      source <(sudo /home/admin/config.scripts/blitz.subscriptions.letsencrypt.py domain-by-ip $ip)
      if [ ${#error} -eq 0 ]; then
        echo "ip2torDomain='${domain}'"
      fi
    fi

    # check for error
    isDead=$(sudo systemctl status btcpayserver | grep -c 'inactive (dead)')
    if [ ${isDead} -eq 1 ]; then
      echo "error='Service Failed'"
    fi

  else
    echo "installed=0"
  fi
  exit 0
fi

# show info menu
if [ "$1" = "menu" ]; then

  # get LNbits status info
  echo "# collecting status info ... (please wait)"
  source <(sudo /home/admin/config.scripts/bonus.btcpayserver.sh status)

  text="Local Webrowser: https://${localIP}:${httpsPort}"

  if [ ${#publicDomain} -gt 0 ]; then
     text="${text}
Public Domain: https://${publicDomain}:${httpsPort}
port forwarding on router needs to be active & may change port" 
  fi

  text="${text}
SHA1 ${sslFingerprintIP}" 

  if [ "${runBehindTor}" = "on" ] && [ ${#toraddress} -gt 0 ]; then
    /home/admin/config.scripts/blitz.lcd.sh qr "${toraddress}"
    text="${text}\n
TOR Browser Hidden Service address (QR see LCD):
${toraddress}"
  fi
  
  if [ ${#ip2torDomain} -gt 0 ]; then
    text="${text}\n
IP2TOR+LetsEncrypt: https://${ip2torDomain}:${ip2torPort}
SHA1 ${sslFingerprintTOR}"
  elif [ ${#ip2torIP} -gt 0 ]; then
    text="${text}\n
IP2TOR: https://${ip2torIP}:${ip2torPort}
SHA1 ${sslFingerprintTOR}
go MAINMENU > SUBSCRIBE and add LetsEncrypt HTTPS Domain"
  elif [ ${#publicDomain} -eq 0 ]; then
    text="${text}\n
To enable easy reachablity with normal brower from the outside
consider adding a IP2TOR Bridge (MAINMENU > SUBSCRIBE)."
  fi

  whiptail --title " BTCPay Server " --msgbox "${text}" 15 69
  
  /home/admin/config.scripts/blitz.lcd.sh hide
  echo "please wait ..."
  exit 0
fi

# add default values to raspi config if needed
if ! grep -Eq "^BTCPayServer=" /mnt/hdd/raspiblitz.conf; then
  echo "BTCPayServer=off" >> /mnt/hdd/raspiblitz.conf
fi
if ! grep -Eq "^BTCPayDomain=" /mnt/hdd/raspiblitz.conf; then
  echo "BTCPayDomain=off" >> /mnt/hdd/raspiblitz.conf
fi

# write-tls-macaroon
if [ "$1" = "write-tls-macaroon" ]; then

  echo "make sure btcpay is member of lndadmin"
  sudo /usr/sbin/usermod --append --groups lndadmin btcpay

  echo "make sure symlink to central app-data directory exists"
  if ! [[ -L "/home/btcpay/.lnd" ]]; then
    sudo rm -rf "/home/btcpay/.lnd"                          # not a symlink.. delete it silently
    sudo ln -s "/mnt/hdd/app-data/lnd/" "/home/btcpay/.lnd"  # and create symlink
  fi

  # copy admin macaroon
  echo "extra symlink to admin.macaroon for btcpay"
  if ! [[ -L "/home/btcpay/admin.macaroon" ]]; then
    sudo ln -s "/home/btcpay/.lnd/data/chain/${network}/${chain}net/admin.macaroon" "/home/btcpay/admin.macaroon"
  fi

  # set thumbprint
  FINGERPRINT=$(openssl x509 -noout -fingerprint -sha256 -inform pem -in /home/btcpay/.lnd/tls.cert | cut -d"=" -f2)
  doesNetworkEntryAlreadyExists=$(sudo cat /home/btcpay/.btcpayserver/Main/settings.config | grep -c '^network=')
  if [ ${doesNetworkEntryAlreadyExists} -eq 0 ]; then
    echo "setting the LND TLS thumbprint for BTCPay"
    echo "
### Global settings ###
network=mainnet

### Server settings ###
port=23000
bind=127.0.0.1
externalurl=https://$BTCPayDomain

### NBXplorer settings ###
BTC.explorer.url=http://127.0.0.1:24444/
BTC.lightning=type=lnd-rest;server=https://127.0.0.1:8080/;macaroonfilepath=/home/btcpay/admin.macaroon;certthumbprint=$FINGERPRINT
" | sudo -u btcpay tee -a /home/btcpay/.btcpayserver/Main/settings.config
  else
    echo "setting new LND TLS thumbprint for BTCPay"
    s="BTC.lightning=type=lnd-rest\;server=https\://127.0.0.1:8080/\;macaroonfilepath=/home/btcpay/admin.macaroon\;"
    sudo -u btcpay sed -i "s|^${s}certthumbprint=.*|${s}certthumbprint=$FINGERPRINT|g" /home/btcpay/.btcpayserver/Main/settings.config
  fi
  sudo systemctl restart btcpayserver
  exit 0
fi

# switch on
if [ "$1" = "1" ] || [ "$1" = "on" ]; then
  echo "*** INSTALL BTCPAYSERVER ***"

  # --> just serving directly thru TOR for now
  # setting up nginx and the SSL certificate
  #/home/admin/config.scripts/bonus.btcpaysetdomain.sh
  #errorOnInstall=$?
  #if [ ${errorOnInstall} -eq 1 ]; then
  # echo "exiting as user cancelled BTCPayServer installation"
  # exit 1
  #fi

  #if [ "$2" == "tor" ]; then
  #  sudo sed -i "s/^BTCPayDomain=.*/BTCPayDomain='localhost'/g" /mnt/hdd/raspiblitz.conf
  #  /home/admin/config.scripts/internet.hiddenservice.sh btcpay 80 23000
  #else
  #  echo "# FAIL - at the moment only BTCPay Server over TOR is supported"
  #  exit 1
  #fi

  ##################
  # NGINX
  ##################
  # setup nginx symlinks
  if ! [ -f /etc/nginx/sites-available/btcpay_ssl.conf ]; then
     sudo cp /home/admin/assets/nginx/sites-available/btcpay_ssl.conf /etc/nginx/sites-available/btcpay_ssl.conf
  fi
  if ! [ -f /etc/nginx/sites-available/btcpay_tor.conf ]; then
     sudo cp /home/admin/assets/nginx/sites-available/btcpay_tor.conf /etc/nginx/sites-available/btcpay_tor.conf
  fi
  if ! [ -f /etc/nginx/sites-available/btcpay_tor_ssl.conf ]; then
     sudo cp /home/admin/assets/nginx/sites-available/btcpay_tor_ssl.conf /etc/nginx/sites-available/btcpay_tor_ssl.conf
  fi
  sudo ln -sf /etc/nginx/sites-available/btcpay_ssl.conf /etc/nginx/sites-enabled/
  sudo ln -sf /etc/nginx/sites-available/btcpay_tor.conf /etc/nginx/sites-enabled/
  sudo ln -sf /etc/nginx/sites-available/btcpay_tor_ssl.conf /etc/nginx/sites-enabled/
  sudo nginx -t
  sudo systemctl reload nginx
  
  # open the firewall
  echo "*** Updating Firewall ***"
  sudo ufw allow 23000 comment 'allow BTCPay HTTP'
  sudo ufw allow 23001 comment 'allow BTCPay HTTPS'
  echo ""

  # Hidden Service for BTCPay if Tor is active
  if [ "${runBehindTor}" = "on" ]; then
    # correct old Hidden Service with port
    sudo sed -i "s/^HiddenServicePort 80 127.0.0.1:23000/HiddenServicePort 80 127.0.0.1:23002/g" /etc/tor/torrc
    /home/admin/config.scripts/internet.hiddenservice.sh btcpay 80 23002 443 23003
  fi

  # check for $BTCPayDomain
  source /mnt/hdd/raspiblitz.conf

  # stop services
  echo "making sure services are not running"
  sudo systemctl stop nbxplorer 2>/dev/null
  sudo systemctl stop btcpayserver 2>/dev/null

  isInstalled=$(sudo ls /etc/systemd/system/btcpayserver.service 2>/dev/null | grep -c 'btcpayserver.service')
  if [ ${isInstalled} -eq 0 ]; then
    # create btcpay user
    sudo adduser --disabled-password --gecos "" btcpay 2>/dev/null
    cd /home/btcpay

    # store BTCpay data on HDD
    sudo mkdir /mnt/hdd/app-data/.btcpayserver 2>/dev/null

    # move old btcpay data to app-data
    sudo mv -f /mnt/hdd/.btcpayserver/* /mnt/hdd/app-data/.btcpayserver/ 2>/dev/null
    sudo rm -rf /mnt/hdd/.btcpayserver 2>/dev/null

    sudo chown -R btcpay:btcpay /mnt/hdd/app-data/.btcpayserver
    sudo ln -s /mnt/hdd/app-data/.btcpayserver /home/btcpay/ 2>/dev/null
    sudo chown -R btcpay:btcpay /home/btcpay/.btcpayserver

    echo ""
    echo "***"
    echo "Installing .NET"
    echo "***"
    echo ""

    # download dotnet-sdk
    # https://dotnet.microsoft.com/download/dotnet-core/3.1
    # dependencies
    sudo apt-get -y install libunwind8 gettext libssl1.0
    
    if [ "${cpu}" = "arm" ]; then
      binaryVersion="arm"
      dotNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/f2e1cb4a-0c70-49b6-871c-ebdea5ebf09d/acb1ea0c0dbaface9e19796083fe1a6b/dotnet-sdk-3.1.300-linux-arm.tar.gz"
      dotNetChecksum="510de2931522633e5a35cfbaebac255704bb2a282e4980e7597c924531564b1a2f769cf67b3d1f196442ceca3d0d9a53e0a6dcb12adc9b0c6c1500742e7b1ee5"
    elif [ "${cpu}" = "aarch64" ]; then
      binaryVersion="arm64"
      dotNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/e5e70860-a6d4-48cf-b0d1-eeba32657d80/2da3c605aaa65c7e4ac2ad0507a2e429/dotnet-sdk-3.1.300-linux-arm64.tar.gz"
      dotNetChecksum="b1d806dd719e61ae27297515d26e6ef12e615da131db4fd1c29b2acc4d6a68a6b0e4ce94ead4f8f737c203328d596422068c78495eba331a5759f595ed9ed149"
    elif [ "${cpu}" = "x86_64" ]; then
      binaryVersion="x64"
      dotNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/0c795076-b679-457e-8267-f9dd20a8ca28/02446ea777b6f5a5478cd3244d8ed65b/dotnet-sdk-3.1.300-linux-x64.tar.gz"
      dotNetChecksum="1c3844ea5f8847d92372dae67529ebb08f09999cac0aa10ace571c63a9bfb615adbf8b9d5cebb2f960b0a81f6a5fba7d80edb69b195b77c2c7cca174cbc2fd0b"
    fi

    dotNetName="dotnet-sdk-3.1.300-linux-${binaryVersion}.tar.gz"
    sudo rm /home/btcpay/${dotnetName} 2>/dev/null
    sudo -u btcpay wget "${dotNetdirectLink}"
    # check binary is was not manipulated (checksum test)
    actualChecksum=$(sha512sum /home/btcpay/${dotNetName} | cut -d " " -f1)
    if [ "${actualChecksum}" != "${dotNetChecksum}" ]; then
      echo "!!! FAIL !!! Downloaded ${dotNetName} not matching SHA512 checksum: ${dotNetChecksum}"
      exit 1
    fi

    # download aspnetcore-runtime
    if [ "${cpu}" = "arm" ]; then
      AspNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/06f9feeb-cd19-49e9-a5cd-a230e1d8c52f/a232fbb4a6e6a90bbe624225e180308a/aspnetcore-runtime-3.1.4-linux-arm.tar.gz"
      AspNetChecksum="58fe16baf370cebda96b93735be9bc57cf9a846b56ecbdc3c745c83399ad5b59518251996b75ac959ee3a8eb438a92e2ea3d088af4f0631caed3c86006d4ed2d"
    elif [ "${cpu}" = "aarch64" ]; then
      AspNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/0f94ccdf-a791-4978-a0e1-0309911f60a4/d734c7f79e6b180b7b91f3d7e78d24d8/aspnetcore-runtime-3.1.4-linux-arm64.tar.gz"
      AspNetChecksum="db91ea66e796e3d27ee08d50cb0532d1fb74060d5a8f1c90d2f34cb66ad74d50d6a8d128457693c15216b3c94d6c1acb7bd342fe0a0fa770117e21211972abda"
    elif [ "${cpu}" = "x86_64" ]; then
      AspNetdirectLink="https://download.visualstudio.microsoft.com/download/pr/a1ddc998-933c-47af-b8c7-dc2503e44e91/42d8cd08b2055df52c9457c993911f2e/aspnetcore-runtime-3.1.4-linux-x64.tar.gz"
      AspNetChecksum="a761fd3652a0bc838c33b2846724d21e82410a5744bd37cbfab96c60327c89ee89c177e480a519b0e0d62ee58ace37e2c2a4b12b517e5eb0af601ad9804e028f"
    fi

    aspNetCoreName="aspnetcore-runtime-3.1.4-linux-${binaryVersion}.tar.gz"
    sudo rm /home/btcpay/${aspNetCoreName} 2>/dev/null
    sudo -u btcpay wget "${AspNetdirectLink}"
    # check binary is was not manipulated (checksum test)
    actualAspNetChecksum=$(sha512sum /home/btcpay/${aspNetCoreName} | cut -d " " -f1)
    if [ "${actualAspNetChecksum}" != "${AspNetChecksum=}" ]; then
      echo "!!! FAIL !!! Downloaded ${aspNetCoreName} not matching SHA512 checksum: ${AspNetChecksum=}"
      exit 1
    fi

    sudo -u btcpay mkdir /home/btcpay/dotnet
    sudo -u btcpay tar -xvf ${dotNetName} -C /home/btcpay/dotnet
    sudo -u btcpay tar -xvf ${aspNetCoreName} -C /home/btcpay/dotnet
    sudo rm -f *.tar.gz*

    # opt out of telemetry
    echo "DOTNET_CLI_TELEMETRY_OPTOUT=1" | sudo tee -a /etc/environment

    # make .NET accessible and add to PATH
    sudo ln -s /home/btcpay/dotnet /usr/share
    export PATH=$PATH:/usr/share
    if [ $(cat /etc/profile | grep -c "/usr/share") -eq 0 ]; then
      sudo bash -c "echo 'PATH=\$PATH:/usr/share' >> /etc/profile"
    fi
    export DOTNET_ROOT=/home/btcpay/dotnet
    export PATH=$PATH:/home/btcpay/dotnet
    if [ $(cat /etc/profile | grep -c "DOTNET_ROOT") -eq 0 ]; then
      sudo bash -c "echo 'DOTNET_ROOT=/home/btcpay/dotnet' >> /etc/profile"
      sudo bash -c "echo 'PATH=\$PATH:/home/btcpay/dotnet' >> /etc/profile"
    fi
    sudo -u btcpay /home/btcpay/dotnet/dotnet --info

    # NBXplorer
    echo ""
    echo "***"
    echo "Install NBXplorer"
    echo "***"
    echo ""

    cd /home/btcpay
    echo "Downloading NBXplorer source code.."
    sudo -u btcpay git clone https://github.com/dgarage/NBXplorer.git 2>/dev/null
    cd NBXplorer
    # check https://github.com/dgarage/NBXplorer/releases
    sudo -u btcpay git reset --hard v2.1.34
    # from the build.sh with path
    sudo -u btcpay /home/btcpay/dotnet/dotnet build -c Release NBXplorer/NBXplorer.csproj


    # create nbxplorer service
    echo "
[Unit]
Description=NBXplorer daemon
Requires=bitcoind.service
After=bitcoind.service

[Service]
ExecStart=/home/btcpay/dotnet/dotnet \"/home/btcpay/NBXplorer/NBXplorer/bin/Release/netcoreapp3.1/NBXplorer.dll\" -c /home/btcpay/.nbxplorer/Main/settings.config
User=btcpay
Group=btcpay
Type=simple
PIDFile=/run/nbxplorer/nbxplorer.pid
Restart=on-failure

PrivateTmp=true
ProtectSystem=full
NoNewPrivileges=true
PrivateDevices=true

[Install]
WantedBy=multi-user.target
" | sudo tee /etc/systemd/system/nbxplorer.service

    sudo systemctl daemon-reload
    # start to create settings.config
    sudo systemctl enable nbxplorer
    sudo systemctl start nbxplorer

    echo "Checking for nbxplorer config"
    while [ ! -f "/home/btcpay/.nbxplorer/Main/settings.config" ]
      do
        echo "Waiting for nbxplorer to start - CTRL+C to abort"
        sleep 10
        hasFailed=$(sudo systemctl status nbxplorer | grep -c "Active: failed")
        if [ ${hasFailed} -eq 1 ]; then
          echo "seems like starting nbxplorer service has failed - see: systemctl status nbxplorer"
          echo "maybe report here: https://github.com/rootzoll/raspiblitz/issues/214"
        fi
    done

    echo ""
    echo "***"
    echo "getting RPC credentials from the bitcoin.conf"
    RPC_USER=$(sudo cat /mnt/hdd/bitcoin/bitcoin.conf | grep rpcuser | cut -c 9-)
    PASSWORD_B=$(sudo cat /mnt/hdd/bitcoin/bitcoin.conf | grep rpcpassword | cut -c 13-)
    sudo mv /home/btcpay/.nbxplorer/Main/settings.config /home/btcpay/.nbxplorer/Main/settings.config.backup
    touch /home/admin/settings.config
    sudo chmod 600 /home/admin/settings.config || exit 1
    cat >> /home/admin/settings.config <<EOF
btc.rpc.user=raspibolt
btc.rpc.password=$PASSWORD_B
EOF

    sudo mv /home/admin/settings.config /home/btcpay/.nbxplorer/Main/settings.config
    sudo chown btcpay:btcpay /home/btcpay/.nbxplorer/Main/settings.config
    sudo systemctl restart nbxplorer

    # BTCPayServer
    echo ""
    echo "***"
    echo "Install BTCPayServer"
    echo "***"
    echo ""

    cd /home/btcpay
    echo "Downloading BTCPayServer source code.."
    sudo -u btcpay git clone https://github.com/btcpayserver/btcpayserver.git 2>/dev/null
    cd btcpayserver
    # check https://github.com/btcpayserver/btcpayserver/releases
    sudo -u btcpay git reset --hard v1.0.5.2
    # use latest commit (v1.0.4.4+) to fix build with latest dotNet
    # sudo -u btcpay git checkout f2bb24f6ab6d402af8214c67f84e08116eb650e7
    # from the build.sh with path
    sudo -u btcpay /home/btcpay/dotnet/dotnet build -c Release /home/btcpay/btcpayserver/BTCPayServer/BTCPayServer.csproj

    # create btcpayserver service
    echo "
[Unit]
Description=BtcPayServer daemon
Requires=btcpayserver.service
After=nbxplorer.service

[Service]
ExecStart=/home/btcpay/dotnet/dotnet run --no-launch-profile --no-build -c Release -p \"/home/btcpay/btcpayserver/BTCPayServer/BTCPayServer.csproj\" -- \$@
User=btcpay
Group=btcpay
Type=simple
PIDFile=/run/btcpayserver/btcpayserver.pid
Restart=on-failure

[Install]
WantedBy=multi-user.target
" | sudo tee /etc/systemd/system/btcpayserver.service

    sudo systemctl daemon-reload
    sudo systemctl enable btcpayserver
    sudo systemctl start btcpayserver

    echo "Checking for btcpayserver config"
    while [ ! -f "/home/btcpay/.btcpayserver/Main/settings.config" ]
      do
        echo "Waiting for btcpayserver to start - CTRL+C to abort"
        sleep 10
        hasFailed=$(sudo systemctl status btcpayserver  | grep -c "Active: failed")
        if [ ${hasFailed} -eq 1 ]; then
          echo "seems like starting btcpayserver  service has failed - see: systemctl status btcpayserver"
          echo "maybe report here: https://github.com/rootzoll/raspiblitz/issues/214"
        fi
    done

    /home/admin/config.scripts/bonus.btcpayserver.sh write-tls-macaroon

  else
    echo "BTCPay Server is already installed."
    # start service
    echo "start service"
    sudo systemctl start nbxplorer 2>/dev/null
    sudo systemctl start btcpayserver 2>/dev/null
  fi

  # setting value in raspi blitz config
  sudo sed -i "s/^BTCPayServer=.*/BTCPayServer=on/g" /mnt/hdd/raspiblitz.conf
  exit 0
fi

# switch off
if [ "$1" = "0" ] || [ "$1" = "off" ]; then

  # setting value in raspi blitz config
  sudo sed -i "s/^BTCPayServer=.*/BTCPayServer=off/g" /mnt/hdd/raspiblitz.conf

  # Hidden Service if Tor is active
  if [ "${runBehindTor}" = "on" ]; then
    /home/admin/config.scripts/internet.hiddenservice.sh off btcpay
  fi

  isInstalled=$(sudo ls /etc/systemd/system/btcpayserver.service 2>/dev/null | grep -c 'btcpayserver.service')
  if [ ${isInstalled} -eq 1 ]; then
    echo "*** REMOVING BTCPAYSERVER, NBXPLORER and .NET ***"
    # removing services
    # btcpay
    sudo systemctl stop btcpayserver
    sudo systemctl disable btcpayserver
    sudo rm /etc/systemd/system/btcpayserver.service
    # nbxplorer
    sudo systemctl stop nbxplorer
    sudo systemctl disable nbxplorer
    sudo rm /etc/systemd/system/nbxplorer.service
    # clear dotnet cache
    dotnet nuget locals all --clear
    sudo rm -rf /tmp/NuGetScratch
    # remove dotnet
    sudo rm -rf /usr/share/dotnet
    # clear app config (not user data)
    sudo rm -f /home/btcpay/.nbxplorer/Main/settings.config
    sudo rm -f /home/btcpay/.btcpayserver/Main/settings.config
    # clear nginx config (from btcpaysetdomain)
    sudo rm -f /etc/nginx/sites-enabled/btcpayserver
    sudo rm -f /etc/nginx/sites-available/btcpayserver
    # remove nginx symlinks
    sudo rm -f /etc/nginx/sites-enabled/btcpay_ssl.conf
    sudo rm -f /etc/nginx/sites-enabled/btcpay_tor.conf
    sudo rm -f /etc/nginx/sites-enabled/btcpay_tor_ssl.conf
    sudo rm -f /etc/nginx/sites-available/btcpay_ssl.conf
    sudo rm -f /etc/nginx/sites-available/btcpay_tor.conf
    sudo rm -f /etc/nginx/sites-available/btcpay_tor_ssl.conf
    sudo nginx -t
    sudo systemctl reload nginx
    # nuke user
    sudo userdel -rf btcpay 2>/dev/null
    echo "OK BTCPayServer removed."
  else
    echo "BTCPayServer is not installed."
  fi
  exit 0
fi

echo "FAIL - Unknown Parameter $1"
exit 1