from __future__ import annotations

import json
from urllib.parse import parse_qs

from fastapi import APIRouter, HTTPException, Query, Request
from fastapi.responses import PlainTextResponse
from starlette.concurrency import run_in_threadpool

from ..dependencies import ServiceDep, StoreDep, apply_update_response
from ..dns import DnsProviderError
from ..event_statuses import DASHBOARD_HOSTNAME_ACTIVATED
from ..security import client_ip
from ..services.ddns import BadIpError
from .path_params import ManagementSlugPath, UpdateSlugPath

router = APIRouter()


@router.get(
    "/api/v1/router/register/{dashboard_secret}",
    response_class=PlainTextResponse,
    response_model=None,
    operation_id="registerHostnameFromRouterGet",
    tags=["router"],
)
async def register_hostname_get(
    dashboard_secret: ManagementSlugPath,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None = Query(default=None),
    ipaddr: str | None = Query(default=None),
    myipv6: str | None = Query(default=None),
    ip6addr: str | None = Query(default=None),
) -> str | PlainTextResponse:
    return await _register_hostname(dashboard_secret, request, store, service, myip, ipaddr, myipv6, ip6addr)


@router.post(
    "/api/v1/router/register/{dashboard_secret}",
    response_class=PlainTextResponse,
    response_model=None,
    operation_id="registerHostnameFromRouterPost",
    tags=["router"],
)
async def register_hostname_post(
    dashboard_secret: ManagementSlugPath,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None = Query(default=None),
    ipaddr: str | None = Query(default=None),
    myipv6: str | None = Query(default=None),
    ip6addr: str | None = Query(default=None),
) -> str | PlainTextResponse:
    return await _register_hostname(dashboard_secret, request, store, service, myip, ipaddr, myipv6, ip6addr)


async def _register_hostname(
    dashboard_secret: str,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None,
    ipaddr: str | None,
    myipv6: str | None,
    ip6addr: str | None,
) -> str | PlainTextResponse:
    myip, ipaddr, myipv6, ip6addr = await _ip_params_from_request(request, myip, ipaddr, myipv6, ip6addr)
    account = await run_in_threadpool(store.get_account_by_management_slug, dashboard_secret)
    if not account or account["disabled"]:
        raise HTTPException(status_code=404, detail="not found")
    hostname = str(account["hostname"])
    if not service.hostname_is_managed(hostname):
        raise HTTPException(status_code=404, detail="not found")
    if not account["accepted_at"]:
        try:
            await run_in_threadpool(service.publish_initial_dns, request, hostname, myip, ipaddr, myipv6, ip6addr)
        except BadIpError as exc:
            return PlainTextResponse(f"badip {exc}", status_code=400)
        except DnsProviderError:
            return PlainTextResponse("911 dns registration failed", status_code=500)
    activated = await run_in_threadpool(store.activate_account, hostname)
    if not activated:
        raise HTTPException(status_code=404, detail="not found")
    await run_in_threadpool(
        store.log_update_event,
        hostname,
        None,
        None,
        DASHBOARD_HOSTNAME_ACTIVATED,
        "hostname registered",
        client_ip(request, service.settings),
    )
    return "good registered"


@router.get(
    "/api/v1/router/update/{update_slug}",
    response_class=PlainTextResponse,
    response_model=None,
    operation_id="updateHostnameFromRouterGet",
    tags=["router"],
)
async def update_hostname_get(
    update_slug: UpdateSlugPath,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None = Query(default=None),
    ipaddr: str | None = Query(default=None),
    myipv6: str | None = Query(default=None),
    ip6addr: str | None = Query(default=None),
) -> str | PlainTextResponse:
    return await _update_hostname(update_slug, request, store, service, myip, ipaddr, myipv6, ip6addr)


@router.post(
    "/api/v1/router/update/{update_slug}",
    response_class=PlainTextResponse,
    response_model=None,
    operation_id="updateHostnameFromRouterPost",
    tags=["router"],
)
async def update_hostname_post(
    update_slug: UpdateSlugPath,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None = Query(default=None),
    ipaddr: str | None = Query(default=None),
    myipv6: str | None = Query(default=None),
    ip6addr: str | None = Query(default=None),
) -> str | PlainTextResponse:
    return await _update_hostname(update_slug, request, store, service, myip, ipaddr, myipv6, ip6addr)


async def _update_hostname(
    update_slug: str,
    request: Request,
    store: StoreDep,
    service: ServiceDep,
    myip: str | None,
    ipaddr: str | None,
    myipv6: str | None,
    ip6addr: str | None,
) -> str | PlainTextResponse:
    myip, ipaddr, myipv6, ip6addr = await _ip_params_from_request(request, myip, ipaddr, myipv6, ip6addr)
    account = await run_in_threadpool(store.get_account_by_slug, update_slug)
    if not account or account["disabled"] or not account["accepted_at"]:
        raise HTTPException(status_code=404, detail="not found")
    if not service.hostname_is_managed(str(account["hostname"])):
        raise HTTPException(status_code=404, detail="not found")
    return await run_in_threadpool(apply_update_response, service, request, str(account["hostname"]), myip, ipaddr, myipv6, ip6addr)


async def _ip_params_from_request(
    request: Request,
    myip: str | None,
    ipaddr: str | None,
    myipv6: str | None,
    ip6addr: str | None,
) -> tuple[str | None, str | None, str | None, str | None]:
    if request.method != "POST":
        return myip, ipaddr, myipv6, ip6addr
    body_values = await _post_values(request)
    return (
        myip or body_values.get("myip"),
        ipaddr or body_values.get("ipaddr"),
        myipv6 or body_values.get("myipv6"),
        ip6addr or body_values.get("ip6addr"),
    )


async def _post_values(request: Request) -> dict[str, str]:
    content_type = request.headers.get("content-type", "").split(";", 1)[0].strip().lower()
    body = await request.body()
    if not body:
        return {}
    if content_type == "application/json":
        try:
            data = json.loads(body)
        except json.JSONDecodeError:
            return {}
        if not isinstance(data, dict):
            return {}
        return {str(key): str(value) for key, value in data.items() if isinstance(value, str)}
    if content_type == "application/x-www-form-urlencoded":
        try:
            form_body = body.decode("utf-8", errors="strict")
        except UnicodeDecodeError:
            return {}
        try:
            parsed = parse_qs(form_body, keep_blank_values=True, max_num_fields=8)
        except ValueError:
            return {}
        return {key: values[0] for key, values in parsed.items() if values}
    return {}