#!/bin/bash
set -eux
set -o pipefail

. /root/stackrc

PUBLIC_INTERFACE=$(os-config-applier --key neutron.ovs.public_interface --key-default '')

ovs-vsctl --no-wait -- --may-exist add-br br-ex
ovs-vsctl --no-wait br-set-external-id br-ex bridge-id br-ex

if [ -n "$PUBLIC_INTERFACE" ] ; then
    ovs-vsctl --no-wait -- --may-exist add-port br-ex $PUBLIC_INTERFACE
fi

find_cidr() {
    local cidr=$1
    # Determine subnet ID
    local id=""
    local subnets=$(neutron subnet-list --quote none -f csv -F id -F cidr)
    for subnet in $subnets; do
        id=${subnet%%,*}
        this_cidr=${subnet##*,}
        # Remove trailing \r from csv format
        this_cidr=${this_cidr%?}
        if [ "$this_cidr" = "$cidr" ] ; then
            break
        else
            id=""
        fi
    done
    echo $id
}

FIXED_RANGE=$(os-config-applier --key neutron.ovs.fixed_range --key-default '' --type netaddress)

# Determine subnet ID
id=$(find_cidr $FIXED_RANGE)
if [ -z "$id" ] ; then
    echo "Could not find $FIXED_RANGE in existing subnets. Aborting..."
    exit 1
fi

echo $FIXED_RANGE has id $id

# Ensure tenant network has route to metadata
if ! neutron router-show default-router >/dev/null 2>&1 ; then
    neutron router-create default-router
fi

if ! neutron router-port-list default-router -f csv -F fixed_ips | grep -q "$id" ; then
    neutron router-interface-add default-router $id
fi

# Ensure defined floating ip range exists
FLOATING_RANGE=$(os-config-applier --key neutron.floatingip_range --type netaddress --key-default '')
if [ -n "$FLOATING_RANGE" ] ; then
    # External net?
    if ! neutron net-show ext-net >/dev/null 2>&1 ; then
        neutron net-create ext-net --router:external=True
    fi
    id=$(find_cidr $FLOATING_RANGE)
    if [ -z "$id" ] ; then
        # id is set by command below
	POOL_START=$(os-config-applier --key neutron.floatingip_start --type netaddress)
	POOL_END=$(os-config-applier --key neutron.floatingip_end --type netaddress)
        eval $(neutron subnet-create ext-net $FLOATING_RANGE --disable-dhcp \
	    --allocation-pool start=$POOL_START,end=$POOL_END -f shell -c id|grep '^id=')
    fi
    # Attach it to default-router
    if ! neutron router-port-list default-router -f csv -F fixed_ips | grep -q "$id" ; then
        # Make ext-net the gateway
        neutron router-gateway-set default-router ext-net
    fi
fi


service neutron-metadata-agent restart
service neutron-l3-agent restart
service neutron-dhcp-agent restart