# The purpose of this script is to make a clone of the br-int content
# into br-migration, and to create fake provider bridges.
# This way, while we synchronize the neutron database into the OVN
# northbound DB, and that translates into southbound content all
# the ovn-controllers around are able to create the SBDB content
# safely, without disrupting the existing neutron ml2/ovs dataplane.

OVN_MIG_PREFIX=br-mig
OVN_BR_MIGRATION=${OVN_BR_MIGRATION:-br-migration}

function recreate_bridge_mappings() {
    function new_bridge_mappings() {
        orig_bms=$1

        if echo $orig_bms | grep $OVN_MIG_PREFIX; then
        echo $orig_bms
        return
        fi
        ovn_bms=$(echo $1 | sed 's/\"//g' | sed 's/,/ /g')
        final_bm=""
        br_n=0

        for bm in $ovn_bms; do
        parts=($(echo $bm | sed 's/:/ /g'))
        physnet=${parts[0]}
        bridge="${OVN_MIG_PREFIX}-${br_n}"
        mapping="${physnet}:${bridge}"
        if [[ -z "$final_bm" ]]; then
            final_bm=$mapping
        else
            final_bm="${final_bm},${mapping}"
        fi
        # ensure bridge
        ovs-vsctl --may-exist add-br $bridge
        br_n=$(( br_n + 1 ))
        done
        echo $final_bm
    }
    ovn_orig_bm=$(ovs-vsctl get open . external_ids:ovn-bridge-mappings)

    # backup the original mapping if we didn't already do
    ovs-vsctl get open . external_ids:ovn-bridge-mappings-back || \
         ovs-vsctl set open . external_ids:ovn-bridge-mappings-back="$ovn_orig_bm"

    new_mapping=$(new_bridge_mappings $ovn_orig_bm)

    ovs-vsctl set open . external_ids:ovn-bridge-mappings="$new_mapping"
}

function copy_interfaces_to_br_migration() {

    interfaces=$(ovs-vsctl list-ifaces br-int | egrep -v 'qr-|ha-|qg-|rfp-')
    for interface in $interfaces; do
        if [[ "$interface" == "br-int" ]]; then
        continue
        fi
        ifmac=$(ovs-vsctl get Interface $interface external-ids:attached-mac)
        if [ $? -ne 0 ]; then
        echo "Can't get port details for $interface"
        continue
        fi
        ifstatus=$(ovs-vsctl get Interface $interface external-ids:iface-status)
        ifid=$(ovs-vsctl get Interface $interface external-ids:iface-id)
        ifname=x$interface
        ovs-vsctl -- --may-exist add-port $OVN_BR_MIGRATION $ifname \
             -- set Interface $ifname type=internal \
             -- set Interface $ifname external-ids:iface-status=$ifstatus \
             -- set Interface $ifname external-ids:attached-mac=$ifmac \
             -- set Interface $ifname external-ids:iface-id=$ifid

        echo cloned port $interface from br-int as $ifname on $OVN_BR_MIGRATION
    done
}

recreate_bridge_mappings
podman restart ovn_controller
copy_interfaces_to_br_migration
