#
# -*- coding: utf-8 -*-
# Copyright 2019 Red Hat
# GNU General Public License v3.0+
# (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
"""
The nxos_lacp_interfaces class
It is in this file where the current configuration (as dict)
is compared to the provided configuration (as dict) and the command set
necessary to bring the current configuration to it's desired end-state is
created
"""
from __future__ import absolute_import, division, print_function

__metaclass__ = type

from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.cfg.base import (
    ConfigBase,
)
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import (
    to_list,
    dict_diff,
    remove_empties,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.facts.facts import (
    Facts,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.utils.utils import (
    flatten_dict,
    search_obj_in_list,
    get_interface_type,
    normalize_interface,
)


class Lacp_interfaces(ConfigBase):
    """
    The nxos_lacp_interfaces class
    """

    gather_subset = ["!all", "!min"]

    gather_network_resources = ["lacp_interfaces"]

    exclude_params = ["port_priority", "rate", "min", "max"]

    def __init__(self, module):
        super(Lacp_interfaces, self).__init__(module)

    def get_lacp_interfaces_facts(self, data=None):
        """ Get the 'facts' (the current configuration)

        :rtype: A dictionary
        :returns: The current configuration as a dictionary
        """
        facts, _warnings = Facts(self._module).get_facts(
            self.gather_subset, self.gather_network_resources, data=data
        )
        lacp_interfaces_facts = facts["ansible_network_resources"].get(
            "lacp_interfaces"
        )
        if not lacp_interfaces_facts:
            return []
        return lacp_interfaces_facts

    def execute_module(self):
        """ Execute the module

        :rtype: A dictionary
        :returns: The result from module execution
        """
        result = {"changed": False}
        commands = list()
        warnings = list()

        if self.state in self.ACTION_STATES:
            existing_lacp_interfaces_facts = self.get_lacp_interfaces_facts()
        else:
            existing_lacp_interfaces_facts = []

        if self.state in self.ACTION_STATES or self.state == "rendered":
            commands.extend(self.set_config(existing_lacp_interfaces_facts))

        if commands and self.state in self.ACTION_STATES:
            if not self._module.check_mode:
                self._connection.edit_config(commands)
            result["changed"] = True

        if self.state in self.ACTION_STATES:
            result["commands"] = commands

        if self.state in self.ACTION_STATES or self.state == "gathered":
            changed_lacp_interfaces_facts = self.get_lacp_interfaces_facts()

        elif self.state == "rendered":
            result["rendered"] = commands

        elif self.state == "parsed":
            running_config = self._module.params["running_config"]
            if not running_config:
                self._module.fail_json(
                    msg="value of running_config parameter must not be empty for state parsed"
                )
            result["parsed"] = self.get_lacp_interfaces_facts(
                data=running_config
            )

        if self.state in self.ACTION_STATES:
            result["before"] = existing_lacp_interfaces_facts
            if result["changed"]:
                result["after"] = changed_lacp_interfaces_facts

        elif self.state == "gathered":
            result["gathered"] = changed_lacp_interfaces_facts

        result["warnings"] = warnings
        return result

    def set_config(self, existing_lacp_interfaces_facts):
        """ Collect the configuration from the args passed to the module,
            collect the current configuration (as a dict from facts)

        :rtype: A list
        :returns: the commands necessary to migrate the current configuration
                  to the desired configuration
        """
        config = self._module.params.get("config")
        want = []
        if config:
            for w in config:
                if get_interface_type(w["name"]) not in (
                    "portchannel",
                    "ethernet",
                ):
                    self._module.fail_json(
                        msg="This module works with either portchannel or ethernet"
                    )
                w.update({"name": normalize_interface(w["name"])})
                want.append(remove_empties(w))
        have = existing_lacp_interfaces_facts
        resp = self.set_state(want, have)
        return to_list(resp)

    def set_state(self, want, have):
        """ Select the appropriate function based on the state provided

        :param want: the desired configuration as a dictionary
        :param have: the current configuration as a dictionary
        :rtype: A list
        :returns: the commands necessary to migrate the current configuration
                  to the desired configuration
        """
        state = self._module.params["state"]
        if (
            state in ("overridden", "merged", "replaced", "rendered")
            and not want
        ):
            self._module.fail_json(
                msg="value of config parameter must not be empty for state {0}".format(
                    state
                )
            )
        commands = list()

        if state == "overridden":
            commands.extend(self._state_overridden(want, have))
        elif state == "deleted":
            commands.extend(self._state_deleted(want, have))
        else:
            for w in want:
                if state in ["merged", "rendered"]:
                    commands.extend(self._state_merged(flatten_dict(w), have))
                elif state == "replaced":
                    commands.extend(
                        self._state_replaced(flatten_dict(w), have)
                    )
        return commands

    def _state_replaced(self, w, have):
        """ The command generator when state is replaced

        :rtype: A list
        :returns: the commands necessary to migrate the current configuration
                  to the desired configuration
        """
        commands = []
        obj_in_have = flatten_dict(search_obj_in_list(w["name"], have, "name"))
        diff = dict_diff(w, obj_in_have)
        merged_commands = self.set_commands(w, have)
        if "name" not in diff:
            diff["name"] = w["name"]
        wkeys = w.keys()
        dkeys = diff.keys()
        for k in wkeys:
            if k in self.exclude_params and k in dkeys:
                del diff[k]
        replaced_commands = self.del_attribs(diff)

        if merged_commands:
            cmds = set(replaced_commands).intersection(set(merged_commands))
            for cmd in cmds:
                merged_commands.remove(cmd)
            commands.extend(replaced_commands)
            commands.extend(merged_commands)
        return commands

    def _state_overridden(self, want, have):
        """ The command generator when state is overridden

        :rtype: A list
        :returns: the commands necessary to migrate the current configuration
                  to the desired configuration
        """
        commands = []
        for h in have:
            h = flatten_dict(h)
            obj_in_want = flatten_dict(
                search_obj_in_list(h["name"], want, "name")
            )
            if h == obj_in_want:
                continue
            for w in want:
                w = flatten_dict(w)
                if h["name"] == w["name"]:
                    wkeys = w.keys()
                    hkeys = h.keys()
                    for k in wkeys:
                        if k in self.exclude_params and k in hkeys:
                            del h[k]
            commands.extend(self.del_attribs(h))
        for w in want:
            commands.extend(self.set_commands(flatten_dict(w), have))
        return commands

    def _state_merged(self, w, have):
        """ The command generator when state is merged

        :rtype: A list
        :returns: the commands necessary to merge the provided into
                  the current configuration
        """
        return self.set_commands(w, have)

    def _state_deleted(self, want, have):
        """ The command generator when state is deleted

        :rtype: A list
        :returns: the commands necessary to remove the current configuration
                  of the provided objects
        """
        commands = []
        if want:
            for w in want:
                obj_in_have = flatten_dict(
                    search_obj_in_list(w["name"], have, "name")
                )
                commands.extend(self.del_attribs(obj_in_have))
        else:
            if not have:
                return commands
            for h in have:
                commands.extend(self.del_attribs(flatten_dict(h)))
        return commands

    def del_attribs(self, obj):
        commands = []
        if not obj or len(obj.keys()) == 1:
            return commands
        commands.append("interface " + obj["name"])
        if "graceful" in obj:
            commands.append("lacp graceful-convergence")
        if "vpc" in obj:
            commands.append("no lacp vpn-convergence")
        if "suspend_individual" in obj:
            commands.append("lacp suspend_individual")
        if "mode" in obj:
            commands.append("no lacp mode " + obj["mode"])
        if "max" in obj:
            commands.append("no lacp max-bundle")
        if "min" in obj:
            commands.append("no lacp min-links")
        if "port_priority" in obj:
            commands.append("no lacp port-priority")
        if "rate" in obj:
            commands.append("no lacp rate")
        return commands

    def diff_of_dicts(self, w, obj):
        diff = set(w.items()) - set(obj.items())
        diff = dict(diff)
        if diff and w["name"] == obj["name"]:
            diff.update({"name": w["name"]})
        return diff

    def add_commands(self, d):
        commands = []
        if not d:
            return commands
        commands.append("interface" + " " + d["name"])

        if "port_priority" in d:
            commands.append("lacp port-priority " + str(d["port_priority"]))
        if "rate" in d:
            commands.append("lacp rate " + str(d["rate"]))
        if "min" in d:
            commands.append("lacp min-links " + str(d["min"]))
        if "max" in d:
            commands.append("lacp max-bundle " + str(d["max"]))
        if "mode" in d:
            commands.append("lacp mode " + d["mode"])
        if "suspend_individual" in d:
            if d["suspend_individual"] is True:
                commands.append("lacp suspend-individual")
            else:
                commands.append("no lacp suspend-individual")
        if "graceful" in d:
            if d["graceful"] is True:
                commands.append("lacp graceful-convergence")
            else:
                commands.append("no lacp graceful-convergence")
        if "vpc" in d:
            if d["vpc"] is True:
                commands.append("lacp vpc-convergence")
            else:
                commands.append("no lacp vpc-convergence")
        return commands

    def set_commands(self, w, have):
        commands = []
        obj_in_have = flatten_dict(search_obj_in_list(w["name"], have, "name"))
        if not obj_in_have:
            commands = self.add_commands(w)
        else:
            diff = self.diff_of_dicts(w, obj_in_have)
            commands = self.add_commands(diff)
        return commands
