from ipaddress import IPv4Network, IPv6Network
from typing import Any

# noinspection PyProtectedMember
from orchestrator.forms import FormPage
from orchestrator.forms.validators import Choice
from orchestrator.targets import Target
from orchestrator.types import FormGenerator, State, SubscriptionLifecycle, UUIDstr
from orchestrator.workflow import StepList, conditional, done, init, step, workflow
from orchestrator.workflows.steps import resync, set_status, store_process_subscription
from orchestrator.workflows.utils import wrap_create_initial_input_form
from pydantic import validator

from gso.products.product_blocks.router import RouterRole, RouterVendor, generate_fqdn
from gso.products.product_types.router import RouterInactive, RouterProvisioning
from gso.products.product_types.site import Site
from gso.products.shared import PortNumber
from gso.services import infoblox, provisioning_proxy, subscriptions
from gso.services.provisioning_proxy import pp_interaction
from gso.workflows.utils import customer_selector, iso_from_ipv4


def _site_selector() -> Choice:
    site_subscriptions = {}
    for site_id, site_description in subscriptions.get_active_site_subscriptions(
        fields=["subscription_id", "description"]
    ):
        site_subscriptions[str(site_id)] = site_description

    # noinspection PyTypeChecker
    return Choice("Select a site", zip(site_subscriptions.keys(), site_subscriptions.items()))  # type: ignore


def initial_input_form_generator(product_name: str) -> FormGenerator:
    class CreateRouterForm(FormPage):
        class Config:
            title = product_name

        tt_number: str
        customer: customer_selector()  # type: ignore
        router_site: _site_selector()  # type: ignore
        hostname: str
        ts_port: PortNumber
        router_vendor: RouterVendor
        router_role: RouterRole
        is_ias_connected: bool | None = False

        @validator("hostname", allow_reuse=True)
        def hostname_must_be_available(cls, hostname: str, **kwargs: dict[str, Any]) -> str:
            router_site = kwargs["values"].get("router_site")
            if not router_site:
                raise ValueError("Please select a site before setting the hostname.")

            selected_site = Site.from_subscription(router_site).site
            input_fqdn = generate_fqdn(hostname, selected_site.site_name, selected_site.site_country_code)
            if not infoblox.hostname_available(f"lo0.{input_fqdn}"):
                raise ValueError(f'FQDN "{input_fqdn}" is not available.')

            return hostname

    user_input = yield CreateRouterForm

    return user_input.dict()


@step("Create subscription")
def create_subscription(product: UUIDstr, customer: UUIDstr) -> State:
    subscription = RouterInactive.from_product_id(product, customer)

    return {
        "subscription": subscription,
        "subscription_id": subscription.subscription_id,
    }


@step("Initialize subscription")
def initialize_subscription(
    subscription: RouterInactive,
    hostname: str,
    ts_port: PortNumber,
    router_vendor: RouterVendor,
    router_site: str,
    router_role: RouterRole,
) -> State:
    subscription.router.router_ts_port = ts_port
    subscription.router.router_vendor = router_vendor
    subscription.router.router_site = Site.from_subscription(router_site).site
    fqdn = generate_fqdn(
        hostname, subscription.router.router_site.site_name, subscription.router.router_site.site_country_code
    )
    subscription.router.router_fqdn = fqdn
    subscription.router.router_role = router_role
    subscription.router.router_access_via_ts = True
    subscription.description = f"Router {fqdn}"

    subscription = RouterProvisioning.from_other_lifecycle(subscription, SubscriptionLifecycle.PROVISIONING)

    return {"subscription": subscription}


@step("Allocate loopback interfaces in IPAM")
def ipam_allocate_loopback(subscription: RouterProvisioning, is_ias_connected: bool) -> State:
    fqdn = subscription.router.router_fqdn
    loopback_v4, loopback_v6 = infoblox.allocate_host(f"lo0.{fqdn}", "LO", [fqdn], str(subscription.subscription_id))

    subscription.router.router_lo_ipv4_address = loopback_v4
    subscription.router.router_lo_ipv6_address = loopback_v6
    subscription.router.router_lo_iso_address = iso_from_ipv4(subscription.router.router_lo_ipv4_address)
    subscription.router.router_is_ias_connected = is_ias_connected

    return {"subscription": subscription}


@step("Allocate IAS connection in IPAM")
def ipam_allocate_ias_networks(subscription: RouterProvisioning) -> State:
    fqdn = subscription.router.router_fqdn

    subscription.router.router_si_ipv4_network = infoblox.allocate_v4_network(
        "SI", f"SI for {fqdn} - {subscription.subscription_id}"
    )
    subscription.router.router_ias_lt_ipv4_network = infoblox.allocate_v4_network(
        "LT_IAS", f"LT for {fqdn} - {subscription.subscription_id}"
    )
    subscription.router.router_ias_lt_ipv6_network = infoblox.allocate_v6_network(
        "LT_IAS", f"LT for {fqdn} - {subscription.subscription_id}"
    )

    return {"subscription": subscription}


@step("Provision router [DRY RUN]")
def provision_router_dry(subscription: RouterProvisioning, process_id: UUIDstr, tt_number: str) -> State:
    provisioning_proxy.provision_router(subscription, process_id, tt_number)

    return {
        "subscription": subscription,
        "label_text": (
            "Dry run for the deployment of base config on a new router. Deployment is done by the"
            " provisioning proxy, please wait for the results to come back before continuing."
        ),
    }


@step("Provision router [FOR REAL]")
def provision_router_real(subscription: RouterProvisioning, process_id: UUIDstr, tt_number: str) -> State:
    provisioning_proxy.provision_router(subscription, process_id, tt_number, False)

    return {
        "subscription": subscription,
        "label_text": (
            "Deployment of base config for a new router. Deployment is being taken care of by the"
            " provisioning proxy, please wait for the results to come back before continuing."
        ),
    }


@step("Verify IPAM resources for loopback interface")
def verify_ipam_loopback(subscription: RouterProvisioning) -> State:
    host_record = infoblox.find_host_by_fqdn(f"lo0.{subscription.router.router_fqdn}")
    if not host_record or str(subscription.subscription_id) not in host_record.comment:
        return {"ipam_warning": "Loopback record is incorrectly configured in IPAM, please investigate this manually!"}

    return {"subscription": subscription}


@step("Verify IPAM resources for IAS/LT networks")
def verify_ipam_ias(subscription: RouterProvisioning) -> State:
    si_ipv4_network = infoblox.find_network_by_cidr(IPv4Network(subscription.router.router_si_ipv4_network))
    ias_lt_ipv4_network = infoblox.find_network_by_cidr(IPv4Network(subscription.router.router_ias_lt_ipv4_network))
    ias_lt_ipv6_network = infoblox.find_network_by_cidr(IPv6Network(subscription.router.router_ias_lt_ipv6_network))

    new_state = {}

    if not si_ipv4_network or str(subscription.subscription_id) not in si_ipv4_network.comment:
        new_state = {
            "ipam_si_warning": f"SI IPv4 network expected at {subscription.router.router_si_ipv4_network}, "
            f"but it was not found or misconfigured, please investigate and adjust if necessary."
        }
    if not ias_lt_ipv4_network or str(subscription.subscription_id) not in ias_lt_ipv4_network.comment:
        new_state = new_state | {
            "ipam_ias_lt_ipv4_warning": "IAS/LT IPv4 network expected at "
            f"{subscription.router.router_ias_lt_ipv4_network}, but it was not found or misconfigured, please "
            "investigate and adjust if necessary."
        }
    if not ias_lt_ipv6_network or str(subscription.subscription_id) not in ias_lt_ipv6_network.comment:
        new_state = new_state | {
            "ipam_ias_lt_ipv6_warning": f"IAS/LT IPv6 network expected at "
            f"{subscription.router.router_ias_lt_ipv6_network}, but it was not found or misconfigured, please "
            "investigate and adjust if necessary."
        }

    return new_state


@workflow(
    "Create router",
    initial_input_form=wrap_create_initial_input_form(initial_input_form_generator),
    target=Target.CREATE,
)
def create_router() -> StepList:
    should_allocate_ias = conditional(lambda state: state["is_ias_connected"])

    return (
        init
        >> create_subscription
        >> store_process_subscription(Target.CREATE)
        >> initialize_subscription
        >> ipam_allocate_loopback
        >> should_allocate_ias(ipam_allocate_ias_networks)
        >> pp_interaction(provision_router_dry, 3)
        >> pp_interaction(provision_router_real, 3)
        >> verify_ipam_loopback
        >> should_allocate_ias(verify_ipam_ias)
        >> set_status(SubscriptionLifecycle.ACTIVE)
        >> resync
        >> done
    )