# Copyright (c) 2023 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""L2 Utilities Library."""

from enum import IntEnum

from resources.libraries.python.Constants import Constants
from resources.libraries.python.PapiExecutor import PapiSocketExecutor
from resources.libraries.python.topology import Topology
from resources.libraries.python.ssh import exec_cmd_no_error


class L2VtrOp(IntEnum):
    """VLAN tag rewrite operation."""
    L2_VTR_DISABLED = 0
    L2_VTR_PUSH_1 = 1
    L2_VTR_PUSH_2 = 2
    L2_VTR_POP_1 = 3
    L2_VTR_POP_2 = 4
    L2_VTR_TRANSLATE_1_1 = 5
    L2_VTR_TRANSLATE_1_2 = 6
    L2_VTR_TRANSLATE_2_1 = 7
    L2_VTR_TRANSLATE_2_2 = 8


class L2Util:
    """Utilities for l2 configuration."""

    @staticmethod
    def mac_to_int(mac_str):
        """Convert MAC address from string format (e.g. 01:02:03:04:05:06) to
        integer representation (1108152157446).

        :param mac_str: MAC address in string representation.
        :type mac_str: str
        :returns: Integer representation of MAC address.
        :rtype: int
        """
        return int(mac_str.replace(u":", u""), 16)

    @staticmethod
    def int_to_mac(mac_int):
        """Convert MAC address from integer representation (e.g. 1108152157446)
        to string format (01:02:03:04:05:06).

        :param mac_int: MAC address in integer representation.
        :type mac_int: int
        :returns: String representation of MAC address.
        :rtype: str
        """
        return u":".join(
            f"{hex(mac_int)[2:]:0>12}"[i:i+2] for i in range(0, 12, 2)
        )

    @staticmethod
    def mac_to_bin(mac_str):
        """Convert MAC address from string format (e.g. 01:02:03:04:05:06) to
        binary representation (\x01\x02\x03\x04\x05\x06).

        :param mac_str: MAC address in string representation.
        :type mac_str: str
        :returns: Binary representation of MAC address.
        :rtype: bytes
        """
        return bytes.fromhex(mac_str.replace(u":", u""))

    @staticmethod
    def bin_to_mac(mac_bin):
        """Convert MAC address from binary representation
        (\x01\x02\x03\x04\x05\x06) to string format (e.g. 01:02:03:04:05:06).

        :param mac_bin: MAC address in binary representation.
        :type mac_bin: bytes
        :returns: String representation of MAC address.
        :rtype: str
        """
        return u":".join(mac_bin.hex()[i:i + 2] for i in range(0, 12, 2))

    @staticmethod
    def vpp_add_l2fib_entry(
            node, mac, interface, bd_id, static_mac=1, filter_mac=0, bvi_mac=0):
        """ Create a static L2FIB entry on a VPP node.

        :param node: Node to add L2FIB entry on.
        :param mac: Destination mac address in string format 01:02:03:04:05:06.
        :param interface: Interface name or sw_if_index.
        :param bd_id: Bridge domain index.
        :param static_mac: Set to 1 to create static MAC entry.
            (Default value = 1)
        :param filter_mac: Set to 1 to drop packet that's source or destination
            MAC address contains defined MAC address. (Default value = 0)
        :param bvi_mac: Set to 1 to create entry that points to BVI interface.
            (Default value = 0)
        :type node: dict
        :type mac: str
        :type interface: str or int
        :type bd_id: int or str
        :type static_mac: int or str
        :type filter_mac: int or str
        :type bvi_mac: int or str
        """
        if isinstance(interface, str):
            sw_if_index = Topology.get_interface_sw_index(node, interface)
        else:
            sw_if_index = interface

        cmd = u"l2fib_add_del"
        err_msg = f"Failed to add L2FIB entry on host {node[u'host']}"
        args = dict(
            mac=L2Util.mac_to_bin(mac),
            bd_id=int(bd_id),
            sw_if_index=sw_if_index,
            is_add=True,
            static_mac=int(static_mac),
            filter_mac=int(filter_mac),
            bvi_mac=int(bvi_mac)

        )
        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_reply(err_msg)

    @staticmethod
    def create_l2_bd(
            node, bd_id, flood=True, uu_flood=True, forward=True, learn=True,
            arp_term=False):
        """Create an L2 bridge domain on a VPP node.

        :param node: Node where we wish to crate the L2 bridge domain.
        :param bd_id: Bridge domain index.
        :param flood: Enable/disable bcast/mcast flooding in the BD.
            (Default value = 1)
        :param uu_flood: Enable/disable unknown unicast flood in the BD.
            (Default value = 1)
        :param forward: Enable/disable forwarding on all interfaces in
            the BD. (Default value = 1)
        :param learn: Enable/disable MAC learning on all interfaces in the BD.
            (Default value = 1)
        :param arp_term: Enable/disable arp termination in the BD.
            (Default value = 1)
        :type node: dict
        :type bd_id: int or str
        :type flood: bool
        :type uu_flood: bool
        :type forward: bool
        :type learn: bool
        :type arp_term: bool
        """
        cmd = u"bridge_domain_add_del_v2"
        err_msg = f"Failed to create L2 bridge domain on host {node[u'host']}"
        args = dict(
            bd_id=int(bd_id),
            flood=flood,
            uu_flood=uu_flood,
            forward=forward,
            learn=learn,
            arp_term=arp_term,
            is_add=True
        )
        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_reply(err_msg)

    @staticmethod
    def add_interface_to_l2_bd(node, interface, bd_id, shg=0, port_type=0):
        """Add an interface to the L2 bridge domain.

        Get SW IF ID and add it to the bridge domain.

        :param node: Node where we want to execute the command that does this.
        :param interface: Interface name.
        :param bd_id: Bridge domain index.
        :param shg: Split-horizon group index. (Default value = 0)
        :param port_type: Port mode: 0 - normal, 1 - BVI, 2 - UU_FWD.
            (Default value = 0)
        :type node: dict
        :type interface: str
        :type bd_id: int or str
        :type shg: int or str
        :type port_type: int or str
        """
        sw_if_index = Topology.get_interface_sw_index(node, interface)

        cmd = u"sw_interface_set_l2_bridge"
        err_msg = f"Failed to add interface {interface} to L2 bridge domain " \
            f"on host {node[u'host']}"
        args = dict(
            rx_sw_if_index=sw_if_index,
            bd_id=int(bd_id),
            shg=int(shg),
            port_type=int(port_type),
            enable=True
        )

        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_reply(err_msg)

    @staticmethod
    def vpp_add_l2_bridge_domain(node, bd_id, port_1, port_2, learn=True):
        """Add L2 bridge domain with 2 interfaces to the VPP node.

        :param node: Node to add L2BD on.
        :param bd_id: Bridge domain ID.
        :param port_1: First interface name added to L2BD.
        :param port_2: Second interface name added to L2BD.
        :param learn: Enable/disable MAC learn.
        :type node: dict
        :type bd_id: int
        :type port_1: str
        :type port_2: str
        :type learn: bool
        """
        sw_if_index1 = Topology.get_interface_sw_index(node, port_1)
        sw_if_index2 = Topology.get_interface_sw_index(node, port_2)

        cmd1 = u"bridge_domain_add_del_v2"
        args1 = dict(
            bd_id=int(bd_id),
            flood=True,
            uu_flood=True,
            forward=True,
            learn=learn,
            arp_term=False,
            is_add=True
        )

        cmd2 = u"sw_interface_set_l2_bridge"
        args2 = dict(
            rx_sw_if_index=sw_if_index1,
            bd_id=int(bd_id),
            shg=0,
            port_type=0,
            enable=True
        )

        args3 = dict(
            rx_sw_if_index=sw_if_index2,
            bd_id=int(bd_id),
            shg=0,
            port_type=0,
            enable=True
        )

        err_msg = f"Failed to add L2 bridge domain with 2 interfaces " \
            f"on host {node[u'host']}"

        with PapiSocketExecutor(node) as papi_exec:
            # Cannot use get_replies due to VPP-2203.
            papi_exec.add(cmd1, **args1).get_reply(err_msg)
            papi_exec.add(cmd2, **args2).get_reply(err_msg)
            papi_exec.add(cmd2, **args3).get_reply(err_msg)

    @staticmethod
    def vpp_setup_bidirectional_cross_connect(node, interface1, interface2):
        """Create bidirectional cross-connect between 2 interfaces on vpp node.

        :param node: Node to add bidirectional cross-connect.
        :param interface1: First interface name or sw_if_index.
        :param interface2: Second interface name or sw_if_index.
        :type node: dict
        :type interface1: str or int
        :type interface2: str or int
        """
        if isinstance(interface1, str):
            sw_iface1 = Topology().get_interface_sw_index(node, interface1)
        else:
            sw_iface1 = interface1

        if isinstance(interface2, str):
            sw_iface2 = Topology().get_interface_sw_index(node, interface2)
        else:
            sw_iface2 = interface2

        cmd = u"sw_interface_set_l2_xconnect"
        args1 = dict(
            rx_sw_if_index=sw_iface1,
            tx_sw_if_index=sw_iface2,
            enable=True
        )
        args2 = dict(
            rx_sw_if_index=sw_iface2,
            tx_sw_if_index=sw_iface1,
            enable=True
        )
        err_msg = f"Failed to add L2 cross-connect between two interfaces " \
            f"on host {node['host']}"

        with PapiSocketExecutor(node) as papi_exec:
            # Cannot use get_replies due to VPP-2203.
            papi_exec.add(cmd, **args1).get_reply(err_msg)
            papi_exec.add(cmd, **args2).get_reply(err_msg)

    @staticmethod
    def vpp_setup_bidirectional_l2_patch(node, interface1, interface2):
        """Create bidirectional l2 patch between 2 interfaces on vpp node.

        :param node: Node to add bidirectional l2 patch.
        :param interface1: First interface name or sw_if_index.
        :param interface2: Second interface name or sw_if_index.
        :type node: dict
        :type interface1: str or int
        :type interface2: str or int
        """
        if isinstance(interface1, str):
            sw_iface1 = Topology().get_interface_sw_index(node, interface1)
        else:
            sw_iface1 = interface1

        if isinstance(interface2, str):
            sw_iface2 = Topology().get_interface_sw_index(node, interface2)
        else:
            sw_iface2 = interface2

        cmd = u"l2_patch_add_del"
        args1 = dict(
            rx_sw_if_index=sw_iface1,
            tx_sw_if_index=sw_iface2,
            is_add=True
        )
        args2 = dict(
            rx_sw_if_index=sw_iface2,
            tx_sw_if_index=sw_iface1,
            is_add=True
        )
        err_msg = f"Failed to add L2 patch between two interfaces " \
            f"on host {node['host']}"

        with PapiSocketExecutor(node) as papi_exec:
            # Cannot use get_replies due to VPP-2203.
            papi_exec.add(cmd, **args1).get_reply(err_msg)
            papi_exec.add(cmd, **args2).get_reply(err_msg)

    @staticmethod
    def linux_add_bridge(node, br_name, if_1, if_2, set_up=True):
        """Bridge two interfaces on linux node.

        :param node: Node to add bridge on.
        :param br_name: Bridge name.
        :param if_1: First interface to be added to the bridge.
        :param if_2: Second interface to be added to the bridge.
        :param set_up: Change bridge interface state to up after create bridge.
            Optional. Default: True.
        :type node: dict
        :type br_name: str
        :type if_1: str
        :type if_2: str
        :type set_up: bool
        """
        cmd = f"brctl addbr {br_name}"
        exec_cmd_no_error(node, cmd, sudo=True)

        cmd = f"brctl addif {br_name} {if_1}"
        exec_cmd_no_error(node, cmd, sudo=True)

        cmd = f"brctl addif {br_name} {if_2}"
        exec_cmd_no_error(node, cmd, sudo=True)

        if set_up:
            cmd = f"ip link set dev {br_name} up"
            exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def linux_del_bridge(node, br_name, set_down=True):
        """Delete bridge from linux node.

        ..note:: The network interface corresponding to the bridge must be
            down before it can be deleted!

        :param node: Node to delete bridge from.
        :param br_name: Bridge name.
        :param set_down: Change bridge interface state to down before delbr
            command. Optional. Default: True.
        :type node: dict
        :type br_name: str
        :type set_down: bool
        """
        if set_down:
            cmd = f"ip link set dev {br_name} down"
            exec_cmd_no_error(node, cmd, sudo=True)

        cmd = f"brctl delbr {br_name}"
        exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def vpp_get_bridge_domain_data(node, bd_id=Constants.BITWISE_NON_ZERO):
        """Get all bridge domain data from a VPP node. If a domain ID number is
        provided, return only data for the matching bridge domain.

        :param node: VPP node to get bridge domain data from.
        :param bd_id: Numeric ID of a specific bridge domain.
        :type node: dict
        :type bd_id: int
        :returns: List of dictionaries containing data for each bridge domain,
            or a single dictionary for the specified bridge domain.
        :rtype: list or dict
        """
        cmd = u"bridge_domain_dump"
        args = dict(
            bd_id=int(bd_id)
        )
        err_msg = f"Failed to get L2FIB dump on host {node[u'host']}"

        with PapiSocketExecutor(node) as papi_exec:
            details = papi_exec.add(cmd, **args).get_details(err_msg)

        retval = details if bd_id == Constants.BITWISE_NON_ZERO else None

        for bridge_domain in details:
            if bridge_domain[u"bd_id"] == bd_id:
                retval = bridge_domain

        return retval

    @staticmethod
    def l2_vlan_tag_rewrite(
            node, interface, tag_rewrite_method, push_dot1q=True, tag1_id=None,
            tag2_id=None):
        """Rewrite tags in ethernet frame.

        :param node: Node to rewrite tags.
        :param interface: Interface on which rewrite tags.
        :param tag_rewrite_method: Method of tag rewrite.
        :param push_dot1q: Optional parameter to disable to push dot1q tag
            instead of dot1ad.
        :param tag1_id: Optional tag1 ID for VLAN.
        :param tag2_id: Optional tag2 ID for VLAN.
        :type node: dict
        :type interface: str or int
        :type tag_rewrite_method: str
        :type push_dot1q: bool
        :type tag1_id: int
        :type tag2_id: int
        """
        tag1_id = int(tag1_id) if tag1_id else 0
        tag2_id = int(tag2_id) if tag2_id else 0

        vtr_oper = getattr(
            L2VtrOp, f"L2_VTR_{tag_rewrite_method.replace(u'-', u'_').upper()}"
        )

        if isinstance(interface, str):
            iface_key = Topology.get_interface_by_name(node, interface)
            sw_if_index = Topology.get_interface_sw_index(node, iface_key)
        else:
            sw_if_index = interface

        cmd = u"l2_interface_vlan_tag_rewrite"
        args = dict(
            sw_if_index=sw_if_index,
            vtr_op=int(vtr_oper),
            push_dot1q=int(push_dot1q),
            tag1=tag1_id,
            tag2=tag2_id
        )
        err_msg = f"Failed to set VLAN TAG rewrite on host {node['host']}"

        with PapiSocketExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_reply(err_msg)

    @staticmethod
    def get_l2_fib_table(node, bd_id):
        """Retrieves the L2 FIB table.

        :param node: VPP node.
        :param bd_id: Index of the bridge domain.
        :type node: dict
        :type bd_id: int
        :returns: L2 FIB table.
        :rtype: list
        """
        cmd = u"l2_fib_table_dump"
        args = dict(
            bd_id=int(bd_id)
        )
        err_msg = f"Failed to get L2FIB dump on host {node['host']}"

        with PapiSocketExecutor(node) as papi_exec:
            details = papi_exec.add(cmd, **args).get_details(err_msg)

        for fib_item in details:
            fib_item[u"mac"] = L2Util.bin_to_mac(fib_item[u"mac"])

        return details

    @staticmethod
    def get_l2_fib_entry_by_mac(node, bd_index, mac):
        """Retrieves the L2 FIB entry specified by MAC address using PAPI.

        :param node: VPP node.
        :param bd_index: Index of the bridge domain.
        :param mac: MAC address used as the key in L2 FIB data structure.
        :type node: dict
        :type bd_index: int
        :type mac: str
        :returns: L2 FIB entry
        :rtype: dict
        """
        bd_data = L2Util.vpp_get_bridge_domain_data(node)
        bd_id = bd_data[bd_index-1][u"bd_id"]

        table = L2Util.get_l2_fib_table(node, bd_id)

        for entry in table:
            if entry[u"mac"] == mac:
                return entry
        return {}