import copy
import re
from logging import getLogger
from typing import NoReturn
from uuid import uuid4

from orchestrator import step, workflow
from orchestrator.config.assignee import Assignee
from orchestrator.forms import FormPage
from orchestrator.forms.validators import Choice, Label, UniqueConstrainedList
from orchestrator.targets import Target
from orchestrator.types import FormGenerator, State, UUIDstr
from orchestrator.workflow import StepList, done, init, inputstep
from orchestrator.workflows.steps import resync, store_process_subscription, unsync
from orchestrator.workflows.utils import wrap_modify_initial_input_form
from pydantic import validator
from pydantic_forms.core import ReadOnlyField
from pynetbox.models.dcim import Interfaces

from gso.products.product_blocks.iptrunk import IptrunkInterfaceBlock
from gso.products.product_blocks.router import RouterVendor
from gso.products.product_types.iptrunk import Iptrunk
from gso.products.product_types.router import Router
from gso.services import provisioning_proxy
from gso.services.netbox_client import NetboxClient
from gso.services.provisioning_proxy import pp_interaction
from gso.services.subscriptions import get_active_router_subscriptions
from gso.utils.helpers import (
    LAGMember,
    available_interfaces_choices,
    available_lags_choices,
    get_router_vendor,
    set_isis_to_90000,
)

logger = getLogger(__name__)


def initial_input_form_generator(subscription_id: UUIDstr) -> FormGenerator:
    subscription = Iptrunk.from_subscription(subscription_id)
    form_title = (
        f"Subscription {subscription.iptrunk.geant_s_sid} "
        f" from {subscription.iptrunk.iptrunk_sides[0].iptrunk_side_node.router_fqdn}"
        f" to {subscription.iptrunk.iptrunk_sides[1].iptrunk_side_node.router_fqdn}"
    )
    sides_dict = {
        str(side.iptrunk_side_node.subscription.subscription_id): side.iptrunk_side_node.subscription.description
        for side in subscription.iptrunk.iptrunk_sides
    }

    replaced_side_enum = Choice(
        "Select the side of the IP trunk to be replaced",
        zip(sides_dict.keys(), sides_dict.items()),  # type: ignore[arg-type]
    )

    class IPTrunkMigrateForm(FormPage):
        class Config:
            title = form_title

        tt_number: str
        replace_side: replaced_side_enum  # type: ignore[valid-type]
        warning_label: Label = "Are we moving to a different Site?"  # type: ignore[assignment]
        migrate_to_different_site: bool = False

    migrate_form_input = yield IPTrunkMigrateForm

    current_routers = [
        side.iptrunk_side_node.subscription.subscription_id for side in subscription.iptrunk.iptrunk_sides
    ]

    routers = {}
    for router in get_active_router_subscriptions(includes=["subscription_id", "description"]):
        router_id = router["subscription_id"]
        if router_id not in current_routers:
            current_router_site = Router.from_subscription(router_id).router.router_site.subscription
            old_side_site = Router.from_subscription(migrate_form_input.replace_side).router.router_site
            if (
                migrate_form_input.migrate_to_different_site
                and current_router_site.subscription_id == old_side_site.owner_subscription_id
            ):
                continue
            routers[str(router_id)] = router["description"]

    new_router_enum = Choice("Select a new router", zip(routers.keys(), routers.items()))  # type: ignore[arg-type]

    class NewSideIPTrunkRouterForm(FormPage):
        class Config:
            title = form_title

        new_node: new_router_enum  # type: ignore[valid-type]

    new_side_iptrunk_router_input = yield NewSideIPTrunkRouterForm
    new_router = new_side_iptrunk_router_input.new_node
    side_a_ae_iface = available_lags_choices(new_router) or str

    if get_router_vendor(new_router) == RouterVendor.NOKIA:

        class NokiaLAGMember(LAGMember):
            interface_name: available_interfaces_choices(  # type: ignore[valid-type]
                new_router, subscription.iptrunk.iptrunk_speed
            )

        class NokiaAeMembers(UniqueConstrainedList[NokiaLAGMember]):
            min_items = len(subscription.iptrunk.iptrunk_sides[0].iptrunk_side_ae_members)
            max_items = len(subscription.iptrunk.iptrunk_sides[1].iptrunk_side_ae_members)

        ae_members = NokiaAeMembers
    else:

        class JuniperLagMember(UniqueConstrainedList[LAGMember]):
            min_items = len(subscription.iptrunk.iptrunk_sides[0].iptrunk_side_ae_members)
            max_items = len(subscription.iptrunk.iptrunk_sides[1].iptrunk_side_ae_members)

        ae_members = JuniperLagMember  # type: ignore[assignment]

    replace_index = (
        0
        if str(subscription.iptrunk.iptrunk_sides[0].iptrunk_side_node.subscription.subscription_id)
        == migrate_form_input.replace_side
        else 1
    )
    existing_lag_ae_members = [
        {"interface_name": iface.interface_name, "interface_description": iface.interface_description}
        for iface in subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_ae_members
    ]

    class NewSideIPTrunkForm(FormPage):
        class Config:
            title = form_title

        new_lag_interface: side_a_ae_iface  # type: ignore[valid-type]
        existing_lag_interface: list[LAGMember] = ReadOnlyField(existing_lag_ae_members)
        new_lag_member_interfaces: ae_members  # type: ignore[valid-type]

        @validator("new_lag_interface", allow_reuse=True, pre=True, always=True)
        def lag_interface_proper_name(cls, new_lag_interface: str) -> str | NoReturn:
            if get_router_vendor(new_router) == RouterVendor.JUNIPER:
                juniper_lag_re = re.compile("^ae\\d{1,2}$")
                if not juniper_lag_re.match(new_lag_interface):
                    raise ValueError("Invalid LAG name, please try again.")
            return new_lag_interface

    new_side_input = yield NewSideIPTrunkForm
    return (
        migrate_form_input.dict()
        | new_side_iptrunk_router_input.dict()
        | new_side_input.dict()
        | {"replace_index": replace_index}
    )


@step("[DRY RUN] Disable configuration on old router")
def disable_old_config_dry(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "deactivate",
        "deactivate",
    )

    return {
        "subscription": subscription,
        "label_text": "[DRY RUN] Disable config on old node, please refresh to get the results of the playbook.",
    }


@step("[REAL] Disable configuration on old router")
def disable_old_config_real(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "deactivate",
        "deactivate",
        False,
    )

    return {
        "subscription": subscription,
        "label_text": "Disable config on the old node, please refresh to get the results of the playbook.",
    }


@step("[DRY RUN] Deploy configuration on new router")
def deploy_new_config_dry(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "deploy",
        "trunk_interface",
    )

    logger.warning("Playbook verb is not yet properly set.")

    return {
        "subscription": subscription,
        "label_text": "[DRY RUN] Deploying new trunk interface, please refresh to get the results of the playbook.",
    }


@step("Deploy configuration on new router")
def deploy_new_config_real(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "deploy",
        "trunk_interface",
        False,
    )

    logger.warning("Playbook verb is not yet properly set.")

    return {
        "subscription": subscription,
        "label_text": "[COMMIT] Deploying new trunk interface, please refresh to get the results of the playbook.",
    }


@inputstep("Wait for confirmation", assignee=Assignee.SYSTEM)
def confirm_continue_move_fiber() -> FormGenerator:
    class ProvisioningResultPage(FormPage):
        class Config:
            title = "Please confirm before continuing"

        info_label: Label = (
            "New Trunk interface has been deployed, "
            "wait for the physical connection to be moved."  # type: ignore[assignment]
        )

    yield ProvisioningResultPage

    return {}


# Interface checks go here


@step("Deploy ISIS configuration on new router")
def deploy_new_isis(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "deploy",
        "isis_interface",
        False,
    )

    logger.warning("Playbook verb is not yet properly set.")

    return {
        "subscription": subscription,
        "label_text": "Deploy ISIS config on the new router, please refresh to get the results of the playbook.",
    }


@inputstep("Wait for confirmation", assignee=Assignee.SYSTEM)
def confirm_continue_restore_isis() -> FormGenerator:
    class ProvisioningResultPage(FormPage):
        class Config:
            title = "Please confirm before continuing"

        info_label: Label = (
            "ISIS config has been deployed, confirm if you want to restore the old metric."  # type: ignore[assignment]
        )

    yield ProvisioningResultPage

    return {}


@step("Restore ISIS metric to original value")
def restore_isis_metric(subscription: Iptrunk, process_id: UUIDstr, tt_number: str, old_isis_metric: int) -> State:
    subscription.iptrunk.iptrunk_isis_metric = old_isis_metric
    provisioning_proxy.provision_ip_trunk(subscription, process_id, tt_number, "isis_interface", False)

    return {"subscription": subscription}


@step("[DRY RUN] Delete configuration on old router")
def delete_old_config_dry(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "delete",
        "delete",
    )

    logger.warning("Playbook verb is not yet properly set.")

    return {
        "subscription": subscription,
        "label_text": "[DRY RUN] Removing configuration from old router,"
        "please refresh to get the results of the playbook.",
    }


@step("Delete configuration on old router")
def delete_old_config_real(
    subscription: Iptrunk,
    new_node: Router,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
    replace_index: int,
    process_id: UUIDstr,
    tt_number: str,
) -> State:
    provisioning_proxy.migrate_ip_trunk(
        subscription,
        new_node,
        new_lag_interface,
        new_lag_member_interfaces,
        replace_index,
        process_id,
        tt_number,
        "delete",
        "delete",
        False,
    )

    logger.warning("Playbook verb is not yet properly set.")

    return {
        "subscription": subscription,
        "label_text": "Removing configuration from old router, please refresh to get the results of the playbook.",
    }


@step("Update IPAM")
def update_ipam(subscription: Iptrunk) -> State:
    return {"subscription": subscription}


@step("Update subscription model")
def update_subscription_model(
    subscription: Iptrunk,
    replace_index: int,
    new_node: UUIDstr,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
) -> State:
    # Deep copy of subscription data
    old_subscription = copy.deepcopy(subscription)
    old_side_data = {
        "iptrunk_side_node": old_subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_node,
        "iptrunk_side_ae_iface": old_subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_ae_iface,
        "iptrunk_side_ae_members": old_subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_ae_members,
    }
    subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_node = Router.from_subscription(new_node).router
    subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_ae_iface = new_lag_interface
    subscription.iptrunk.iptrunk_sides[replace_index].iptrunk_side_ae_members.clear()
    #  And update the list to only include the new member interfaces
    for member in new_lag_member_interfaces:
        subscription.iptrunk.iptrunk_sides[0].iptrunk_side_ae_members.append(
            IptrunkInterfaceBlock.new(subscription_id=uuid4(), **member)
        )

    return {"subscription": subscription, "old_side_data": old_side_data}


@step("Reserve interfaces in Netbox")
def reserve_interfaces_in_netbox(
    subscription: Iptrunk,
    new_node: UUIDstr,
    new_lag_interface: str,
    new_lag_member_interfaces: list[dict],
) -> State:
    new_side = Router.from_subscription(new_node).router

    nbclient = NetboxClient()
    if new_side.router_vendor == RouterVendor.NOKIA:
        # Create LAG interfaces
        lag_interface: Interfaces = nbclient.create_interface(
            iface_name=new_lag_interface,
            type="lag",
            device_name=new_side.router_fqdn,
            description=str(subscription.subscription_id),
            enabled=True,
        )
        # Attach physical interfaces to LAG
        # Reserve interfaces
        for interface in new_lag_member_interfaces:
            nbclient.attach_interface_to_lag(
                device_name=new_side.router_fqdn,
                lag_name=lag_interface.name,
                iface_name=interface["interface_name"],
                description=str(subscription.subscription_id),
            )
            nbclient.reserve_interface(
                device_name=new_side.router_fqdn,
                iface_name=interface["interface_name"],
            )
    return {"subscription": subscription}


@step("Update Netbox. Allocate new interfaces and deallocate old ones.")
def update_netbox(
    subscription: Iptrunk,
    replace_index: int,
    old_side_data: dict,
) -> State:
    new_side = subscription.iptrunk.iptrunk_sides[replace_index]
    nbclient = NetboxClient()
    if new_side.iptrunk_side_node.router_vendor == RouterVendor.NOKIA:
        for interface in new_side.iptrunk_side_ae_members:
            nbclient.allocate_interface(
                device_name=new_side.iptrunk_side_node.router_fqdn,
                iface_name=interface.interface_name,
            )
    if old_side_data["iptrunk_side_node"]["router_vendor"] == RouterVendor.NOKIA:
        # Set interfaces to free
        for iface in old_side_data["iptrunk_side_ae_members"]:
            nbclient.free_interface(old_side_data["iptrunk_side_node"]["router_fqdn"], iface["interface_name"])

        # Delete LAG interfaces
        nbclient.delete_interface(
            old_side_data["iptrunk_side_node"]["router_fqdn"], old_side_data["iptrunk_side_ae_iface"]
        )
    return {"subscription": subscription}


@workflow(
    "Migrate an IP Trunk",
    initial_input_form=wrap_modify_initial_input_form(initial_input_form_generator),
    target=Target.MODIFY,
)
def migrate_iptrunk() -> StepList:
    return (
        init
        >> store_process_subscription(Target.MODIFY)
        >> unsync
        >> reserve_interfaces_in_netbox
        >> pp_interaction(set_isis_to_90000, 3)
        >> pp_interaction(disable_old_config_dry, 3)
        >> pp_interaction(disable_old_config_real, 3)
        >> pp_interaction(deploy_new_config_dry, 3)
        >> pp_interaction(deploy_new_config_real, 3)
        >> confirm_continue_move_fiber
        >> pp_interaction(deploy_new_isis, 3)
        >> confirm_continue_restore_isis
        >> pp_interaction(restore_isis_metric, 3)
        >> pp_interaction(delete_old_config_dry, 3)
        >> pp_interaction(delete_old_config_real, 3)
        >> update_ipam
        >> update_subscription_model
        >> update_netbox
        >> resync
        >> done
    )