from __future__ import annotations

from typing import NoReturn

from fastapi import APIRouter, HTTPException, Request, Response
from fastapi.responses import HTMLResponse, PlainTextResponse, RedirectResponse
from starlette.concurrency import run_in_threadpool

from ..dependencies import ServiceDep, SettingsDep, StoreDep
from ..dns import DnsProviderError
from ..event_statuses import (
    DASHBOARD_HOSTNAME_ACTIVATED,
    DASHBOARD_HOSTNAME_DELETED,
    DASHBOARD_UPDATE_URL_ROTATED,
)
from ..security import client_ip, dashboard_csrf_token, require_dashboard_csrf
from ..services.ddns import BadIpError
from ..web.forms import first_form_value, request_form
from ..web.html_utils import trusted
from ..web.layout import _page
from ..web.templates_management import (
    _render_management_page,
    _render_management_unlock_page,
    _render_pending_management_page,
)
from . import management_passwords
from .management_shared import (
    get_active_management_account,
    get_active_management_account_async,
    has_management_access,
    locked_management_response,
    management_account_is_accepted,
    render_management_page_async,
)
from .path_params import ManagementSlugPath

router = APIRouter()
router.include_router(management_passwords.router)


@router.get("/m/{management_slug}", response_class=HTMLResponse, include_in_schema=False)
def manage_dashboard(
    management_slug: ManagementSlugPath,
    request: Request,
    settings: SettingsDep,
    store: StoreDep,
    service: ServiceDep,
    activated: bool = False,
) -> str:
    account = get_active_management_account(store, management_slug)
    csrf_token = dashboard_csrf_token(management_slug, account)
    if not management_account_is_accepted(account):
        return _render_pending_management_page(
            service, settings, management_slug, account, csrf_token, request_ip=client_ip(request, settings)
        )
    if not has_management_access(request, settings, management_slug, account):
        return _render_management_unlock_page(management_slug, account, csrf_token)
    message = "Hostname registered. Add the update URL to your router." if activated else None
    return _render_management_page(
        service,
        settings,
        management_slug,
        account,
        csrf_token,
        message=message,
        request_ip=client_ip(request, settings),
    )


@router.post("/m/{management_slug}/activate", include_in_schema=False, response_model=None)
async def activate_dashboard(
    management_slug: ManagementSlugPath,
    request: Request,
    settings: SettingsDep,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None = None,
    ipaddr: str | None = None,
    myipv6: str | None = None,
    ip6addr: str | None = None,
) -> RedirectResponse | HTMLResponse:
    account = await get_active_management_account_async(store, management_slug)
    form = await request_form(request, settings)
    require_dashboard_csrf(management_slug, account, first_form_value(form, "csrf"))
    hostname = str(account["hostname"])
    if not management_account_is_accepted(account):
        try:
            await run_in_threadpool(service.publish_initial_dns, request, hostname, myip, ipaddr, myipv6, ip6addr)
        except BadIpError:
            return HTMLResponse(
                _render_pending_management_page(
                    service,
                    settings,
                    management_slug,
                    account,
                    dashboard_csrf_token(management_slug, account),
                    "The supplied IP address is invalid. Leave IP fields empty and let the router send the first update.",
                    client_ip(request, settings),
                ),
                status_code=400,
            )
        except DnsProviderError:
            return HTMLResponse(
                _render_pending_management_page(
                    service,
                    settings,
                    management_slug,
                    account,
                    dashboard_csrf_token(management_slug, account),
                    "DNS registration failed. The hostname was not registered.",
                    client_ip(request, settings),
                ),
                status_code=500,
            )
    activated_account = await run_in_threadpool(lambda: store.activate_account(hostname))
    if not activated_account:
        return _not_found()
    await run_in_threadpool(
        store.log_update_event,
        hostname,
        None,
        None,
        DASHBOARD_HOSTNAME_ACTIVATED,
        "hostname registered",
        client_ip(request, settings),
    )
    return RedirectResponse(f"/m/{management_slug}?activated=1", status_code=303)


@router.post("/m/{management_slug}/rotate", response_class=HTMLResponse, include_in_schema=False, response_model=None)
async def rotate_dashboard_secrets(
    management_slug: ManagementSlugPath,
    request: Request,
    settings: SettingsDep,
    store: StoreDep,
    service: ServiceDep,
) -> str | HTMLResponse:
    account = await get_active_management_account_async(store, management_slug)
    if not management_account_is_accepted(account):
        return HTMLResponse(
            _render_pending_management_page(
                service,
                settings,
                management_slug,
                account,
                dashboard_csrf_token(management_slug, account),
                "Register this hostname first.",
                client_ip(request, settings),
            ),
            status_code=400,
        )
    if not has_management_access(request, settings, management_slug, account):
        return locked_management_response(management_slug, account)
    form = await request_form(request, settings)
    require_dashboard_csrf(management_slug, account, first_form_value(form, "csrf"))
    hostname = str(account["hostname"])
    action = first_form_value(form, "action")
    request_ip = client_ip(request, settings)
    if action == "update":
        rotated = await run_in_threadpool(store.rotate_update_slug, hostname)
        if not rotated:
            return _not_found()
        await run_in_threadpool(
            store.log_update_event,
            hostname,
            None,
            None,
            DASHBOARD_UPDATE_URL_ROTATED,
            "router update URL rotated",
            request_ip,
        )
        return await render_management_page_async(
            service,
            settings,
            management_slug,
            rotated,
            dashboard_csrf_token(management_slug, rotated),
            message="Update URL changed. Update your router now.",
            request_ip=request_ip,
        )
    raise _bad_rotation_action()


@router.post("/m/{management_slug}/delete", include_in_schema=False)
async def delete_dashboard_hostname(
    management_slug: ManagementSlugPath, request: Request, settings: SettingsDep, store: StoreDep, service: ServiceDep
) -> Response:
    account = await get_active_management_account_async(store, management_slug)
    if not has_management_access(request, settings, management_slug, account):
        return HTMLResponse(
            _render_management_unlock_page(management_slug, account, dashboard_csrf_token(management_slug, account)),
            status_code=401,
        )
    form = await request_form(request, settings)
    require_dashboard_csrf(management_slug, account, first_form_value(form, "csrf"))
    hostname = str(account["hostname"])
    try:
        await run_in_threadpool(service.delete_account, hostname, "management-link")
    except DnsProviderError:
        return PlainTextResponse("DNS delete failed. Hostname was not deleted.", status_code=500)
    await run_in_threadpool(
        store.log_update_event,
        hostname,
        None,
        None,
        DASHBOARD_HOSTNAME_DELETED,
        "hostname deleted from dashboard",
        client_ip(request, settings),
    )
    return HTMLResponse(
        _page(
            "Hostname deleted",
            trusted("""
            <main>
              <section class="hero-band compact">
                <div class="container text-center d-grid justify-items-center gap-3">
                  <p class="eyebrow">Deleted</p>
                  <h1>Hostname deleted.</h1>
                  <p class="lead">The update URL no longer works.</p>
                  <a class="btn btn-outline-primary rounded-pill" href="/">Home</a>
                </div>
              </section>
            </main>
            """),
        )
    )


def _not_found() -> NoReturn:
    raise HTTPException(status_code=404, detail="not found")


def _bad_rotation_action() -> NoReturn:
    raise HTTPException(status_code=400, detail="invalid rotation action")