#!/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

EXC_PY3="$(/usr/bin/which python3)"
if [ -z "$EXC_PY3" ]; then
  echo "[ERROR] Missing required install dependency 'python3'." >&2
  echo "Please install using \"apt install python3\"." >&2
  exit 1
fi

EXC_MAKE="$(/usr/bin/which make)"
if [ -z "$EXC_MAKE" ]; then
  echo "[ERROR] Missing required install dependency 'make'." >&2
  echo "Please install using \"apt install make\"." >&2
  exit 1
fi

LIB_BUILD_ESSTL="$(apt list --installed 2>/dev/null | grep build-essential)"
if [ -z "$LIB_BUILD_ESSTL" ]; then
  echo "[ERROR] Missing required install dependency 'build-essential'." >&2
  echo "Please install using \"apt install build-essential\"." >&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/daemon"

echo "[INSTALL] Installing npm build dependencies for daemon project"
$EXC_NPM install

echo "[INSTALL] Transpiling typescript sources of daemon project"
$EXC_NPM run build

echo "[INSTALL] Installing daemon service application"
if [ -d "$INSTALL_DIR/dist" ]; then
  rm -rf "$INSTALL_DIR/dist"
fi
cp -rv "dist" "$INSTALL_DIR/"
if [ ! -f "$INSTALL_DIR/.env" ]; then
  cp -v ".env.default" "$INSTALL_DIR/.env"
fi
cp -v "cpu.sh" "$INSTALL_DIR/"
cp -v "hdd.sh" "$INSTALL_DIR/"
cp -v "ram.sh" "$INSTALL_DIR/"
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@daemon.service\""
SVC_FILE="/lib/systemd/system/monitoring@daemon.service"

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

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

[Service]
Type=simple
WorkingDirectory=$INSTALL_DIR
ExecStart=node .
ExecStop=/bin/kill -TERM \$MAINPID

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

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

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

echo "[SUCCESS] HostBBQ Monitoring Daemon installed and activated successfully"