#!/bin/bash

INSTALL_DIR="${PWD}"

# Check system requirements: Git, Node & NPM
EXC_GIT="$(/usr/bin/which git)"
if [ -z "$EXC_GIT" ]; then
  echo "[ERROR] Missing required system dependency 'git'." >&2
  echo "Please install using \"apt install git\"" >&2
  exit 1
fi

EXC_NPM="$(/usr/bin/which npm)"
if [ -z "$EXC_NPM" ]; then
  echo "[ERROR] Missing required system dependency 'npm'." >&2
  echo "Please install following the official install documentation." >&2
  exit 1
fi

EXC_NODE="$(/usr/bin/which node)"
if [ -z "$EXC_NODE" ]; then
  echo "[ERROR] Missing required system dependency 'node'." >&2
  echo "Please install following the official install documentation." >&2
  exit 1
fi

GCC_CONFIG_DIR="${INSTALL_DIR}/google-cloud"
FCM_ACCOUNT_JSON="${GCC_CONFIG_DIR}/firebase-adminsdk.json"
GCM_API_JSON="${GCC_CONFIG_DIR}/gcm-api.json"

if [ ! -d "$GCC_CONFIG_DIR" ]; then
  echo "[ERROR] Missing required google cloud key files. Please prepare directory 'google-cloud' in install directory." >&2
  exit 1
fi

if [ ! -f "$FCM_ACCOUNT_JSON" ]; then
  echo "[ERROR] Missing required Firebase Admin SDK key file. Please provide this file as 'google-cloud/firebase-adminsdk.json' in order to install." >&2
  exit 1
fi

if [ ! -f "$GCM_API_JSON" ]; then
  echo "[ERROR] Missing required Google Cloud API key file. Please provide this file as 'google-cloud/gcm-api.json' in order to install." >&2
  exit 1
fi

# exit on error exit codes
set -e

TMPFOLDER="/tmp/hbbq/monitoring/$(date +'%Y%m%d%H%M%S')"

echo "[INSTALL] Cloning entire project into temp folder $TMPFOLDER"
mkdir -p "$TMPFOLDER"
git clone https://gogs.hostbbq.com/hostbbq/hostbbq-monitoring.git "$TMPFOLDER"

cd "$TMPFOLDER"

echo "[INSTALL] Cloning submodules ..."
git submodule init
git submodule update

cd "$TMPFOLDER/fcm/express"
echo "[INSTALL] Installing npm build dependencies for FCM backend API project"
$EXC_NPM install

cd "$TMPFOLDER/fcm/ng"
echo "[INSTALL] Installing npm build dependencies for FCM Angular frontend project"
$EXC_NPM install

echo "[INSTALL] Building FCM Angular frontend project"
$EXC_NPM run build

cd "$TMPFOLDER/fcm/express"
echo "[INSTALL] Transpiling typescript sources of FCM backend API project"
$EXC_NPM run build

echo "[INSTALL] Installing server application"
if [ -d "$INSTALL_DIR/dist" ]; then
  rm -rf "$INSTALL_DIR/dist"
fi
cp -rv "dist" "$INSTALL_DIR/"
if [ -d "$INSTALL_DIR/public" ]; then
  rm -rf "$INSTALL_DIR/public"
fi
cp -rv "public" "$INSTALL_DIR/"
if [ ! -f "$INSTALL_DIR/.env" ]; then
  cp -v ".env.default" "$INSTALL_DIR/.env"
fi
cp -v "package.json" "$INSTALL_DIR/"

cd "$INSTALL_DIR"

echo "[INSTALL] Installing npm runtime dependencies"
$EXC_NPM install --omit=dev

echo "[INSTALL] Creating and enabling systemd unit \"monitoring@fcm.service\""
SVC_FILE="/lib/systemd/system/monitoring@fcm.service"

ACTION="update"
if [ ! -f "$SVC_FILE" ]; then
  ACTION="install"
fi

cat > $SVC_FILE << EOF
[Unit]
Description=HostBBQ FCM Registration Service
After=network.target

[Service]
Type=simple
WorkingDirectory=$INSTALL_DIR
ExecStart=node .

[Install]
WantedBy=multi-user.target
Alias=monitoring@fcm.service
EOF

if [[ "$ACTION" = "install" ]]; then
  systemctl enable monitoring@fcm.service
  systemctl start monitoring@fcm.service
else
  systemctl daemon-reload
  systemctl restart monitoring@fcm.service
fi

echo "[CLEANUP] Removing temp folder $TMPFOLDER"
rm -rf "$TMPFOLDER"

echo "[SUCCESS] HostBBQ FCM Registration Service installed and activated successfully"