#!/usr/bin/env bash

# Setup script environment
set -o errexit  #Exit immediately if a pipeline returns a non-zero status
set -o errtrace #Trap ERR from shell functions, command substitutions, and commands from subshell
set -o nounset  #Treat unset variables as an error
set -o pipefail #Pipe will exit with last non-zero status if applicable
shopt -s expand_aliases
alias die='EXIT=$? LINE=$LINENO error_exit'
trap die ERR
trap cleanup EXIT

function error_exit() {
  trap - ERR
  local DEFAULT='Unknown failure occured.'
  local REASON="\e[97m${1:-$DEFAULT}\e[39m"
  local FLAG="\e[91m[ERROR] \e[93m$EXIT@$LINE"
  msg "$FLAG $REASON"
  [ ! -z ${CTID-} ] && cleanup_ctid
  exit $EXIT
}
function warn() {
  local REASON="\e[97m$1\e[39m"
  local FLAG="\e[93m[WARNING]\e[39m"
  msg "$FLAG $REASON"
}
function info() {
  local REASON="$1"
  local FLAG="\e[36m[INFO]\e[39m"
  msg "$FLAG $REASON"
}
function msg() {
  local TEXT="$1"
  echo -e "$TEXT"
}
function cleanup_ctid() {
  if $(pct status $CTID &>/dev/null); then
    if [ "$(pct status $CTID | awk '{print $2}')" == "running" ]; then
      pct stop $CTID
    fi
    pct destroy $CTID
  elif [ "$(pvesm list $STORAGE --vmid $CTID)" != "" ]; then
    pvesm free $ROOTFS
  fi
}
function cleanup() {
  popd >/dev/null
  rm -rf $TEMP_DIR
}
TEMP_DIR=$(mktemp -d)
pushd $TEMP_DIR >/dev/null

function load_module() {
  if ! $(lsmod | grep -Fq $1); then
    modprobe $1 &>/dev/null || \
      die "Failed to load '$1' module."
  fi
  MODULES_PATH=/etc/modules
  if ! $(grep -Fxq "$1" $MODULES_PATH); then
    echo "$1" >> $MODULES_PATH || \
      die "Failed to add '$1' module to load at boot."
  fi
}

# Create LXC
export CTID=$(pvesh get /cluster/nextid)
export PCT_OSTYPE=debian
export PCT_OSVERSION=10
export PCT_DISK_SIZE=4
export PCT_OPTIONS="
  -cmode shell
  -features nesting=1
  -hostname homeassistant
  -net0 name=eth0,bridge=vmbr0
  -onboot 1
  -tags homeassistant
"
bash -c "$(wget -qLO - https://raw.githubusercontent.com/tteck/Proxmox/main/lxc_create.sh)" || exit

# Detect storage pool type
STORAGE_TYPE=$(pvesm status -storage $(pct config $CTID | grep rootfs | awk -F ":" '{print $2}') | awk 'NR>1 {print $2}')
if [ "$STORAGE_TYPE" == "zfspool" ]; then
  warn "Some addons may not work due to ZFS not supporting 'fallocate'."
fi

# Modify LXC permissions to support Docker
LXC_CONFIG=/etc/pve/lxc/${CTID}.conf
cat <<EOF >> $LXC_CONFIG
lxc.cgroup2.devices.allow: a
lxc.cap.drop:
EOF

load_module overlay

# Set container timezone to match host
cat << 'EOF' >> $LXC_CONFIG
lxc.hook.mount: sh -c 'ln -fs $(readlink /etc/localtime) ${LXC_ROOTFS_MOUNT}/etc/localtime'
EOF

# Setup container for Home Assistant
msg "Starting LXC container..."
pct start $CTID

### Begin LXC commands ###
alias lxc-cmd="lxc-attach -n $CTID --"
# Prepare container OS
msg "Setting up container OS..."
lxc-cmd dhclient -4
lxc-cmd sed -i "/$LANG/ s/\(^# \)//" /etc/locale.gen
lxc-cmd locale-gen >/dev/null
lxc-cmd apt-get -y purge openssh-{client,server} >/dev/null

# Update container OS
msg "Updating container OS..."
lxc-cmd apt-get update >/dev/null
lxc-cmd apt-get -qqy upgrade &>/dev/null

# Install prerequisites
msg "Installing prerequisites..."
apt-get -qqy install \
    curl &>/dev/null

# Customize Docker configuration
msg "Customizing Docker..."
DOCKER_CONFIG_PATH='/etc/docker/daemon.json'
mkdir -p $(dirname $DOCKER_CONFIG_PATH)
cat >$DOCKER_CONFIG_PATH <<'EOF'
{
  "log-driver": "journald"
}
EOF

# Install Docker
msg "Installing Docker..."
lxc-cmd sh <(curl -sSL https://get.docker.com) &>/dev/null

# Install Portainer
msg "Installing Portainer..."
docker volume create portainer_data >/dev/null
docker run -d \
  -p 8000:8000 \
  -p 9000:9000 \
  --name=portainer \
  --restart=always \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v portainer_data:/data \
  portainer/portainer-ce:latest &>/dev/null
  
# Install Home Assistant
msg "Installing Home Assistant..."
docker volume create hass_config >/dev/null
docker run -d \
  --name homeassistant \
  --privileged \
  --restart unless-stopped \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v /dev:/dev \
  -v hass_config:/config \
  -v /etc/localtime:/etc/localtime:ro \
  --net=host \
  homeassistant/home-assistant:stable &>/dev/null

# Customize container
msg "Customizing container..."
rm /etc/motd # Remove message of the day after login
rm /etc/update-motd.d/10-uname # Remove kernel information after login
touch ~/.hushlogin # Remove 'Last login: ' and mail notification after login
GETTY_OVERRIDE="/etc/systemd/system/container-getty@1.service.d/override.conf"
mkdir -p $(dirname $GETTY_OVERRIDE)
cat << EOF > $GETTY_OVERRIDE
[Service]
ExecStart=
ExecStart=-/sbin/agetty --autologin root --noclear --keep-baud tty%I 115200,38400,9600 \$TERM
EOF
systemctl daemon-reload
systemctl restart $(basename $(dirname $GETTY_OVERRIDE) | sed 's/\.d//')

# Cleanup container
msg "Cleanup..."
lxc-cmd apt-get autoremove >/dev/null
lxc-cmd apt-get autoclean >/dev/null
lxc-cmd rm -rf /var/{cache,log}/* /var/lib/apt/lists/*
### Finish LXC commands ###

# Get network details
IP=$(pct exec $CTID ip a s dev eth0 | sed -n '/inet / s/\// /p' | awk '{print $2}')

# Show completion message
info "Successfully created Home Assistant LXC to $CTID."
msg "

Home Assistant is reachable by going to the following URLs.

      http://${IP}:8123
      http://${HOSTNAME}.local:8123

"