set -euo pipefail

fakeresolve_ip_list () {
	if [ "$#" -ne 1 ] ; then
		die "Usage: fakeresolve_ip_list <name>"
	fi
	grep -oP "^$1[[:space:]]+IN[[:space:]]+A{1,4}[[:space:]]+\K[^;\s]+" "$debian_bind_confdir/$server_zone_file" | tr '\n' ';'
}

prepare () {
	# Install dependencies
	apt install -y bind9 &>/dev/null
	
	# Create Directories
	if [ -n "$keydir" ] ; then
		mkdir -p "$keydir"
		chown bind:bind "$keydir" -R
		chown bind:bind "$debian_bind_confdir" -R
	fi
	
	# Sync the git repo
	sudo -u bind git_update.sh -N -b main -i "$DATA_DIR/gitkey" -d "$debian_bind_confdir" 'ssh://git@git.jean-cloud.net:22529/adrian/dnszones.git'
	cd /etc/bind
	
	
	echo 'Prepare bind: Remove autogenerated part from bind conf files'
	sed -i -n "/$autoconf_separator/q;p" "$debian_bind_confdir"/*
	
	echo 'Put the separator back'
	for file in $( ls "$debian_bind_confdir"/template.db.* | grep -v '.signed$\|.jbk$\|.jnl$') ; do
		echo "$autoconf_separator" >> "$file"
	done

}

restart () {
	echo 'Restart bind9'
	systemctl restart bind9
}

# Function that simulate a DNS resolve by reading bind zone file
# Returns all the record line:
# @ IN A X.X.X.X
fakeresolve () {
	if [ "$#" -ne 1 ] ; then
		die "Usage: fakeresolve <name>"
	fi
	name="$1"
	
	zonefile="$debian_bind_confdir/$server_zone_file"

	# Split full name if there are dots
	shortname="$name"
	if [ -n "$(echo "$name" | grep -o '\.')" ] ; then
		shortname="$(echo "$name" | grep -Po '^.*(?=\.[^\.]+\.[^\.]+$)' || true)"
	fi

	grep -v -e  '^[[:space:]]*;' "$zonefile"  |grep -oP "^[[:space:]]*$shortname\K[[:space:]]*IN[[:space:]]*A{1,4}[[:space:]]*[\S;]+" | sed 's/^/@/'

}

# Function that add DNS record in the right file
addbindline () {
	if [ "$#" -ne 2 ] ; then
		die "Usage: addbindline <name> <target_cname>"
	fi

	name="$1"
	target="$2"

	# extract the truc.com part
	domain="$(echo "$name" | grep -o '[^\.]\+\.[^\.]\+$' || true)"	
	[ -z "$domain" ] && return 0

	# extract the subdomain part (www)
	shortname="$(echo "$name" | grep -Po '^.*(?=\.[^\.]+\.[^\.]+$)' || true)"

	# bind DB file
	bindfile="$debian_bind_confdir/db.$domain"

	# Only append if db file exists
	[ ! -f "$bindfile" ] && return 0

	if [ -z "$shortname" ] ; then
		# CNAME are forbiden for empty shortnames, so we must resolve the target IPs
		while read line ; do
			line_in_file "$line" "$bindfile"
		done < <(fakeresolve "$target")
	else
		line_in_file "$shortname IN CNAME $target." "$bindfile"
	fi

	#XXX Add CAA records
}

list_template_db_files () {
	ls "$debian_bind_confdir"/template.db.*
}


create_primary_files () {
	# Compact the default SOA
	SOA="$(grep -o '^[^;]*' SOA | sed -z -e 's/[[:space:]]\{2,\}/ /g' -e 's/\n/\\n/')"
	
	
	for file in $(list_template_db_files) ; do
		domain="$(basename "$file" | sed 's/template.db.//')"
		new_db_file="$(echo "$file" | sed 's/template.db./db./')"

		# Set the default SOA if needed
		sed "s/^;JC_AUTOSOA$/$SOA/" "$file" > "$new_db_file"
	
		# If no NS record in the db file
		if [ -z "$(grep '[^;].*IN.*NS' "$new_db_file")" ] ; then
			echo "@ IN NS $default_dns_name" >> "$new_db_file"
		fi
	
		cat  >> "$debian_bind_confdir/named.conf.local" <<EOF
zone "$domain" {
	# https://kb.isc.org/docs/aa-00723
	#allow-update { !{!{$secondary_ips};any;}; key update-key; };
	allow-transfer { $secondary_ips };
	also-notify { $secondary_ips };
	notify yes;
    type master;
    file "$new_db_file";
	dnssec-policy default;
	inline-signing yes;
	key-directory "$DATA_DIR/keys";

};
EOF
	done
	
	echo 'Find every used domain and add them to bind db'
	while read line ; do
		read -r service target < <(echo "$line")
		addbindline "$service" "$target"
		nginxfile="/docker/$service/nginx_server.conf"
		if [ -f "$nginxfile" ] ; then
			for name in $(extract_domain_nginx_conf.sh "$nginxfile" | template.sh "/docker/$service/.env") ; do
				addbindline "$name" "$target"
			done
		fi
	done <"$servicefile"
}

create_secondary_files () {
	primary_ips="$(echo "$primary_ips" | sed 's/^;//')"
	for file in "$debian_bind_confdir"/template.db.* ; do
		file="$(echo "$file" | sed 's/template.db.//')"
		domain="$(basename "$file")"
	
		echo -n "
zone \"$domain\" {
	masters { $primary_ips };
    type slave;
    file \"$file\";
};" >> "$debian_bind_confdir/named.conf.local"
	done

}