#!/bin/bash

CONFIG_DIR=/etc/fastapi-dls

echo "> Create config directory ..."
mkdir -p $CONFIG_DIR

echo "> Install service ..."
cat <<EOF >/etc/systemd/system/fastapi-dls.service
[Unit]
Description=Service for fastapi-dls
After=network.target

[Service]
User=www-data
Group=www-data
AmbientCapabilities=CAP_NET_BIND_SERVICE
WorkingDirectory=/usr/share/fastapi-dls
EnvironmentFile=$CONFIG_DIR/env
ExecStart=uvicorn main:app \\
  --env-file /etc/fastapi-dls/env \\
  --host \$DLS_URL --port \$DLS_PORT \\
  --app-dir /usr/share/fastapi-dls \\
  --ssl-keyfile /etc/fastapi-dls/webserver.key \\
  --ssl-certfile /etc/fastapi-dls/webserver.crt \\
  --proxy-headers
Restart=always
KillSignal=SIGQUIT
Type=simple
StandardError=syslog
NotifyAccess=all

[Install]
WantedBy=multi-user.target

EOF

echo "> Writing default config parameters ..."
touch $CONFIG_DIR/env
cat <<EOF >$CONFIG_DIR/env
DLS_URL=127.0.0.1
DLS_PORT=443
LEASE_EXPIRE_DAYS=90
DATABASE=sqlite:////usr/share/fastapi-dls/db.sqlite

EOF

echo "> Create dls-instance keypair ..."
openssl genrsa -out $CONFIG_DIR/instance.private.pem 2048
openssl rsa -in $CONFIG_DIR/instance.private.pem -outform PEM -pubout -out $CONFIG_DIR/instance.public.pem

while true; do
  read -p "> Do you wish to create self-signed webserver certificate? [Y/n]" yn
  yn=${yn:-y} # ${parameter:-word} If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is substituted.
  case $yn in
  [Yy]*)
    openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout $CONFIG_DIR/webserver.key -out $CONFIG_DIR/webserver.crt
    break
    ;;
  [Nn]*) break ;;
  *) echo "Please answer [y] or [n]." ;;
  esac
done

if [[ -f $CONFIG_DIR/webserver.key ]]; then
  echo "> Starting service ..."
  systemctl start fastapi-dls.service

  if [ -x "$(command -v curl)" ]; then
    echo "> Testing API ..."
    curl --insecure -X GET https://127.0.0.1/status
  else
    echo "> Testing API failed, curl not available. Please test manually!"
  fi
fi

chown -R www-data:www-data $CONFIG_DIR/*

cat <<EOF

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#                                                                             #
#    fastapi-dls is now installed.                                            #
#                                                                             #
#    Service should be up and running.                                        #
#      Webservice is listen to https://localhost                              #
#                                                                             #
#    Configuration is stored in ${CONFIG_DIR}/env                             #
#                                                                             #
#                                                                             #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

EOF