#!/usr/bin/env python3

# Change syntax of bridge interface
# - move interface based bridge-group to actual bridge (de-nest)
# - make stp and igmp-snooping nodes valueless
# https://phabricator.vyos.net/T1556

import sys
from vyos.configtree import ConfigTree

def migrate_bridge(config, tree, intf):
    # check if bridge-group exists
    tree_bridge = tree + ['bridge-group']
    if config.exists(tree_bridge):
        bridge = config.return_value(tree_bridge + ['bridge'])
        # create new bridge member interface
        config.set(base + [bridge, 'member', 'interface', intf])
        # format as tag node to avoid loading problems
        config.set_tag(base + [bridge, 'member', 'interface'])

        # cost: migrate if configured
        tree_cost = tree + ['bridge-group', 'cost']
        if config.exists(tree_cost):
            cost = config.return_value(tree_cost)
            # set new node
            config.set(base + [bridge, 'member', 'interface', intf, 'cost'], value=cost)

        # priority: migrate if configured
        tree_priority = tree + ['bridge-group', 'priority']
        if config.exists(tree_priority):
            priority = config.return_value(tree_priority)
            # set new node
            config.set(base + [bridge, 'member', 'interface', intf, 'priority'], value=priority)

        # Delete the old bridge-group assigned to an interface
        config.delete(tree_bridge)


if __name__ == '__main__':
    if (len(sys.argv) < 1):
        print("Must specify file name!")
        sys.exit(1)

    file_name = sys.argv[1]

    with open(file_name, 'r') as f:
        config_file = f.read()

    config = ConfigTree(config_file)
    base = ['interfaces', 'bridge']

    if not config.exists(base):
        # Nothing to do
        sys.exit(0)
    else:
        #
        # make stp and igmp-snooping nodes valueless
        #
        for br in config.list_nodes(base):
            # STP: check if enabled
            if config.exists(base + [br, 'stp']):
                stp_val = config.return_value(base + [br, 'stp'])
                # STP: delete node with old syntax
                config.delete(base + [br, 'stp'])
                # STP: set new node - if enabled
                if stp_val == "true":
                    config.set(base + [br, 'stp'], value=None)

            # igmp-snooping: check if enabled
            if config.exists(base + [br, 'igmp-snooping', 'querier']):
                igmp_val = config.return_value(base + [br, 'igmp-snooping', 'querier'])
                # igmp-snooping: delete node with old syntax
                config.delete(base + [br, 'igmp-snooping', 'querier'])
                # igmp-snooping: set new node - if enabled
                if igmp_val == "enable":
                    config.set(base + [br, 'igmp', 'querier'], value=None)

        #
        # move interface based bridge-group to actual bridge (de-nest)
        #
        bridge_types = ['bonding', 'ethernet', 'l2tpv3', 'openvpn', 'vxlan', 'wireless']
        for type in bridge_types:
            if not config.exists(['interfaces', type]):
                continue

            for interface in config.list_nodes(['interfaces', type]):
                # check if bridge-group exists
                bridge_group = ['interfaces', type, interface]
                if config.exists(bridge_group + ['bridge-group']):
                    migrate_bridge(config, bridge_group, interface)

                # We also need to migrate VLAN interfaces
                vlan_base = ['interfaces', type, interface, 'vif']
                if config.exists(vlan_base):
                    for vlan in config.list_nodes(vlan_base):
                        intf = "{}.{}".format(interface, vlan)
                        migrate_bridge(config, vlan_base + [vlan], intf)

                # And then we have service VLANs (vif-s) interfaces
                vlan_base = ['interfaces', type, interface, 'vif-s']
                if config.exists(vlan_base):
                    for vif_s in config.list_nodes(vlan_base):
                        intf = "{}.{}".format(interface, vif_s)
                        migrate_bridge(config, vlan_base + [vif_s], intf)

                        # Every service VLAN can have multiple customer VLANs (vif-c)
                        vlan_c = ['interfaces', type, interface, 'vif-s', vif_s, 'vif-c']
                        if config.exists(vlan_c):
                            for vif_c in config.list_nodes(vlan_c):
                                intf = "{}.{}.{}".format(interface, vif_s, vif_c)
                                migrate_bridge(config, vlan_c + [vif_c], intf)

        try:
            with open(file_name, 'w') as f:
                f.write(config.to_string())
        except OSError as e:
            print("Failed to save the modified config: {}".format(e))
            sys.exit(1)