#!/usr/bin/env bash

# CONSTANTS

BASEDIR=$(dirname "$0")
CONTAINER_NAME=$1
TEMPLATE_DIR=/var/lib/vz/template/cache
TAG_NAME=debian13
SSH_PUBKEYS="$BASEDIR/../config/admin.pubkeys"
CONFIG_FILE="$BASEDIR/../config/default.conf"

# FUNCTIONS

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

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

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 optional_public_keys {
	if [[ -f $SSH_PUBKEYS ]]; then
		echo "--ssh-public-keys $SSH_PUBKEYS"
	else
		echo
	fi
}

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 $CONTAINER_NAME \
		--net0 name=eth0,bridge=$BRIDGE,ip=dhcp,firewall=1 \
		--start \
		--onboot true \
		$(optional_public_keys) \
		--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" 2>/dev/null)
	if [[ -z $vmid ]]; then 
		false
	else
		echo "container $CONTAINER_NAME already exists with vmid=$vmid!"
		exit 2
	fi
}

# MAIN

set -Eue
[[ "$#" -lt 1 ]] && usage && exit 1
source "$CONFIG_FILE"

existing_container && false || create_container