import logging
from typing import TYPE_CHECKING, Annotated, Any, Literal

from django.http import HttpRequest, HttpResponse, HttpResponseNotAllowed, HttpResponseRedirect
from django.shortcuts import render
from django.urls import reverse
from django.utils.translation import gettext as _
from pydantic import AfterValidator, Json

from corporate.lib.decorator import (
    authenticated_remote_realm_management_endpoint,
    authenticated_remote_server_management_endpoint,
)
from corporate.models import CustomerPlan, get_current_plan_by_customer, get_customer_by_realm
from zerver.decorator import process_as_post, require_billing_access, zulip_login_required
from zerver.lib.exceptions import JsonableError
from zerver.lib.response import json_success
from zerver.lib.typed_endpoint import typed_endpoint
from zerver.lib.typed_endpoint_validators import check_int_in
from zerver.models import UserProfile
from zilencer.lib.remote_counts import MissingDataError
from zilencer.models import RemoteRealm, RemoteZulipServer

if TYPE_CHECKING:
    from corporate.lib.stripe import RemoteRealmBillingSession, RemoteServerBillingSession


billing_logger = logging.getLogger("corporate.stripe")

ALLOWED_PLANS_API_STATUS_VALUES = [
    CustomerPlan.ACTIVE,
    CustomerPlan.DOWNGRADE_AT_END_OF_CYCLE,
    CustomerPlan.SWITCH_TO_ANNUAL_AT_END_OF_CYCLE,
    CustomerPlan.SWITCH_TO_MONTHLY_AT_END_OF_CYCLE,
    CustomerPlan.FREE_TRIAL,
    CustomerPlan.DOWNGRADE_AT_END_OF_FREE_TRIAL,
    CustomerPlan.ENDED,
]


@zulip_login_required
@typed_endpoint
def billing_page(
    request: HttpRequest,
    *,
    success_message: str = "",
) -> HttpResponse:
    from corporate.lib.stripe import RealmBillingSession

    user = request.user
    assert user.is_authenticated

    billing_session = RealmBillingSession(user=user, realm=user.realm)

    context: dict[str, Any] = {
        "admin_access": user.has_billing_access,
        "has_active_plan": False,
        "org_name": billing_session.org_name(),
        "billing_base_url": "",
    }

    if not user.has_billing_access:
        return render(request, "corporate/billing/billing.html", context=context)

    if user.realm.plan_type == user.realm.PLAN_TYPE_STANDARD_FREE:
        return HttpResponseRedirect(reverse("sponsorship_request"))

    customer = get_customer_by_realm(user.realm)
    if customer is not None and customer.sponsorship_pending:
        # Don't redirect to sponsorship page if the realm is on a paid plan
        if not billing_session.on_paid_plan():
            return HttpResponseRedirect(reverse("sponsorship_request"))
        # If the realm is on a paid plan, show the sponsorship pending message
        context["sponsorship_pending"] = True

    if user.realm.plan_type == user.realm.PLAN_TYPE_LIMITED:
        return HttpResponseRedirect(reverse("plans"))

    if customer is None or get_current_plan_by_customer(customer) is None:
        return HttpResponseRedirect(reverse("upgrade_page"))

    main_context = billing_session.get_billing_page_context()
    if main_context:
        if main_context.get("current_plan_downgraded") is True:
            return HttpResponseRedirect(reverse("plans"))
        context.update(main_context)
        context["success_message"] = success_message

    return render(request, "corporate/billing/billing.html", context=context)


@typed_endpoint
@authenticated_remote_realm_management_endpoint
def remote_realm_billing_page(
    request: HttpRequest,
    billing_session: "RemoteRealmBillingSession",
    *,
    success_message: str = "",
) -> HttpResponse:
    realm_uuid = billing_session.remote_realm.uuid
    context: dict[str, Any] = {
        # We wouldn't be here if user didn't have access.
        "admin_access": billing_session.has_billing_access(),
        "has_active_plan": False,
        "org_name": billing_session.org_name(),
        "billing_base_url": billing_session.billing_base_url,
    }

    if billing_session.remote_realm.plan_type == RemoteRealm.PLAN_TYPE_COMMUNITY:  # nocoverage
        return HttpResponseRedirect(reverse("remote_realm_sponsorship_page", args=(realm_uuid,)))

    customer = billing_session.get_customer()
    if customer is not None and customer.sponsorship_pending:  # nocoverage
        # Don't redirect to sponsorship page if the remote realm is on a paid plan or scheduled for an upgrade.
        if (
            not billing_session.on_paid_plan()
            and billing_session.get_legacy_remote_server_next_plan_name(customer) is None
        ):
            return HttpResponseRedirect(
                reverse("remote_realm_sponsorship_page", args=(realm_uuid,))
            )
        # If the realm is on a paid plan, show the sponsorship pending message
        context["sponsorship_pending"] = True

    if (
        customer is None
        or get_current_plan_by_customer(customer) is None
        or (
            billing_session.get_legacy_remote_server_next_plan_name(customer) is None
            and billing_session.remote_realm.plan_type
            in [
                RemoteRealm.PLAN_TYPE_SELF_MANAGED,
                RemoteRealm.PLAN_TYPE_SELF_MANAGED_LEGACY,
            ]
        )
    ):  # nocoverage
        return HttpResponseRedirect(reverse("remote_realm_plans_page", args=(realm_uuid,)))

    try:
        main_context = billing_session.get_billing_page_context()
    except MissingDataError:  # nocoverage
        return billing_session.missing_data_error_page(request)

    if main_context:
        if main_context.get("current_plan_downgraded") is True:
            return HttpResponseRedirect(reverse("remote_realm_plans_page", args=(realm_uuid,)))
        context.update(main_context)
        context["success_message"] = success_message

    return render(request, "corporate/billing/billing.html", context=context)


@typed_endpoint
@authenticated_remote_server_management_endpoint
def remote_server_billing_page(
    request: HttpRequest,
    billing_session: "RemoteServerBillingSession",
    *,
    success_message: str = "",
) -> HttpResponse:
    context: dict[str, Any] = {
        # We wouldn't be here if user didn't have access.
        "admin_access": billing_session.has_billing_access(),
        "has_active_plan": False,
        "org_name": billing_session.org_name(),
        "billing_base_url": billing_session.billing_base_url,
    }

    if (
        billing_session.remote_server.plan_type == RemoteZulipServer.PLAN_TYPE_COMMUNITY
    ):  # nocoverage
        return HttpResponseRedirect(
            reverse(
                "remote_server_sponsorship_page",
                kwargs={"server_uuid": billing_session.remote_server.uuid},
            )
        )

    customer = billing_session.get_customer()
    if customer is not None and customer.sponsorship_pending:
        # Don't redirect to sponsorship page if the remote realm is on a paid plan or scheduled for an upgrade.
        if (
            not billing_session.on_paid_plan()
            and billing_session.get_legacy_remote_server_next_plan_name(customer) is None
        ):
            return HttpResponseRedirect(
                reverse(
                    "remote_server_sponsorship_page",
                    kwargs={"server_uuid": billing_session.remote_server.uuid},
                )
            )
        # If the realm is on a paid plan, show the sponsorship pending message
        context["sponsorship_pending"] = True  # nocoverage

    if (
        customer is None
        or get_current_plan_by_customer(customer) is None
        or (
            billing_session.get_legacy_remote_server_next_plan_name(customer) is None
            and billing_session.remote_server.plan_type
            in [
                RemoteZulipServer.PLAN_TYPE_SELF_MANAGED,
                RemoteZulipServer.PLAN_TYPE_SELF_MANAGED_LEGACY,
            ]
        )
    ):
        return HttpResponseRedirect(
            reverse(
                "remote_server_upgrade_page",
                kwargs={"server_uuid": billing_session.remote_server.uuid},
            )
        )

    try:
        main_context = billing_session.get_billing_page_context()
    except MissingDataError:  # nocoverage
        return billing_session.missing_data_error_page(request)

    if main_context:
        if main_context.get("current_plan_downgraded") is True:
            return HttpResponseRedirect(
                reverse(
                    "remote_server_plans_page",
                    kwargs={"server_uuid": billing_session.remote_server.uuid},
                )
            )
        context.update(main_context)
        context["success_message"] = success_message

    return render(request, "corporate/billing/billing.html", context=context)


@require_billing_access
@typed_endpoint
def update_plan(
    request: HttpRequest,
    user: UserProfile,
    *,
    status: Annotated[
        Json[int], AfterValidator(lambda x: check_int_in(x, ALLOWED_PLANS_API_STATUS_VALUES))
    ]
    | None = None,
    licenses: Json[int] | None = None,
    licenses_at_next_renewal: Json[int] | None = None,
    schedule: Json[int] | None = None,
    toggle_license_management: Json[bool] = False,
) -> HttpResponse:
    from corporate.lib.stripe import RealmBillingSession, UpdatePlanRequest

    update_plan_request = UpdatePlanRequest(
        status=status,
        licenses=licenses,
        licenses_at_next_renewal=licenses_at_next_renewal,
        schedule=schedule,
        toggle_license_management=toggle_license_management,
    )
    billing_session = RealmBillingSession(user=user)
    billing_session.do_update_plan(update_plan_request)
    return json_success(request)


@process_as_post
@typed_endpoint
@authenticated_remote_realm_management_endpoint
def update_plan_for_remote_realm(
    request: HttpRequest,
    billing_session: "RemoteRealmBillingSession",
    *,
    status: Annotated[
        Json[int], AfterValidator(lambda x: check_int_in(x, ALLOWED_PLANS_API_STATUS_VALUES))
    ]
    | None = None,
    licenses: Json[int] | None = None,
    licenses_at_next_renewal: Json[int] | None = None,
    schedule: Json[int] | None = None,
    toggle_license_management: Json[bool] = False,
) -> HttpResponse:
    from corporate.lib.stripe import UpdatePlanRequest

    update_plan_request = UpdatePlanRequest(
        status=status,
        licenses=licenses,
        licenses_at_next_renewal=licenses_at_next_renewal,
        schedule=schedule,
        toggle_license_management=toggle_license_management,
    )
    billing_session.do_update_plan(update_plan_request)
    return json_success(request)


@process_as_post
@typed_endpoint
@authenticated_remote_server_management_endpoint
def update_plan_for_remote_server(
    request: HttpRequest,
    billing_session: "RemoteServerBillingSession",
    *,
    status: Annotated[
        Json[int], AfterValidator(lambda x: check_int_in(x, ALLOWED_PLANS_API_STATUS_VALUES))
    ]
    | None = None,
    licenses: Json[int] | None = None,
    licenses_at_next_renewal: Json[int] | None = None,
    schedule: Json[int] | None = None,
    toggle_license_management: Json[bool] = False,
) -> HttpResponse:
    from corporate.lib.stripe import UpdatePlanRequest

    update_plan_request = UpdatePlanRequest(
        status=status,
        licenses=licenses,
        licenses_at_next_renewal=licenses_at_next_renewal,
        schedule=schedule,
        toggle_license_management=toggle_license_management,
    )
    billing_session.do_update_plan(update_plan_request)
    return json_success(request)


@typed_endpoint
@authenticated_remote_server_management_endpoint
def remote_server_deactivate_page(
    request: HttpRequest,
    billing_session: "RemoteServerBillingSession",
    *,
    confirmed: Literal[None, "true"] = None,
) -> HttpResponse:
    from corporate.lib.stripe import (
        ServerDeactivateWithExistingPlanError,
        do_deactivate_remote_server,
    )

    if request.method not in ["GET", "POST"]:  # nocoverage
        return HttpResponseNotAllowed(["GET", "POST"])

    remote_server = billing_session.remote_server
    context = {
        "server_hostname": remote_server.hostname,
        "action_url": reverse(remote_server_deactivate_page, args=[str(remote_server.uuid)]),
    }
    if request.method == "GET":
        return render(
            request, "corporate/billing/remote_billing_server_deactivate.html", context=context
        )

    assert request.method == "POST"
    if confirmed is None:  # nocoverage
        # Should be impossible if the user is using the UI.
        raise JsonableError(_("Parameter 'confirmed' is required"))

    try:
        do_deactivate_remote_server(remote_server, billing_session)
    except ServerDeactivateWithExistingPlanError:  # nocoverage
        context["show_existing_plan_error"] = "true"
        return render(
            request, "corporate/billing/remote_billing_server_deactivate.html", context=context
        )

    return render(
        request,
        "corporate/billing/remote_billing_server_deactivated_success.html",
        context={"server_hostname": remote_server.hostname},
    )