#!/usr/bin/env bash

# CONSTANTS

BASEDIR=$(dirname "$0")
CONTAINER_NAME=$1
TEMPLATE_DIR=/var/lib/vz/template/cache
TAG_NAME=debian13
SSH_PUBKEYS="$BASEDIR/pct-administrators.pubkeys"

# FUNCTIONS

function usage {
	echo "$(basename "$0") <CONTAINER_NAME>"
}

function debian13_template {
	ls -1 $TEMPLATE_DIR | grep ^debian-13
}

function show_defaults {
	echo -n "STORAGE_DISK=$STORAGE_DISK,"
	echo -n "STORAGE_SIZE=$STORAGE_SIZE,"
	echo -n "MEMORY=$MEMORY,"
	echo -n "SWAP=$SWAP,"
	echo -n "CPU=$CPU,"
	echo
}

function convert_human_size_to_megabyte {
	value=$1
	echo "$(numfmt --from=iec-i "$value"i --to-unit=Mi)" | cut -dM -f1
}

function convert_human_size_to_gigabyte {
	value=$1
	echo "$(numfmt --from=iec-i "$value"i --to-unit=Gi)" | cut -dG -f1
}

function create_container {
	local new_id=$($BASEDIR/pct-nextid)
	local template_file="$TEMPLATE_DIR/$(debian13_template)"
	local vol_in_gb=$(convert_human_size_to_gigabyte $STORAGE_SIZE)
	local mem_in_mb=$(convert_human_size_to_megabyte $MEMORY)
	local swp_in_mb=$(convert_human_size_to_megabyte $SWAP)
	
	pct create \
		$new_id \
		$template_file \
		--ostype debian \
		--rootfs "volume=$STORAGE_DISK:$vol_in_gb" \
		--cores $CPU \
		--memory $mem_in_mb \
		--swap $swp_in_mb \
		--hostname $CONTAINER_NAME \
		--net0 name=eth0,bridge=vmbr0,ip=dhcp,firewall=1 \
		--start \
		--onboot true \
		--ssh-public-keys $SSH_PUBKEYS \
		--unprivileged true \
		--features nesting=1 \
		
	[[ -n $TAG_NAME ]] && pct set $new_id --tags $TAG_NAME
	echo "container: $CONTAINER_NAME succesfully created with vmid=$new_id!"
}

function existing_container {
	local vmid=$($BASEDIR/pct-lookup "$CONTAINER_NAME")
	if [[ -z $vmid ]]; then 
		false
	else
		echo "container $CONTAINER_NAME already exists with vmid=$vmid!"
		exit 2
	fi
}

# MAIN

set -Eue
[[ "$#" -lt 1 ]] && usage && exit 1
source "$BASEDIR/pct-default.config"

# show_defaults
existing_container && false || create_container