from __future__ import annotations

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

from ..ddns_security import client_ip
from ..dependencies import ServiceDep, SettingsDep
from ..web.forms import first_form_value, request_form
from ..web.templates_public import _render_privacy_page, _render_public_home

router = APIRouter()


@router.get("/", response_class=HTMLResponse, include_in_schema=False)
def index(settings: SettingsDep, service: ServiceDep) -> str:
    return _render_public_home(service, settings, None, None)


@router.get("/magic", include_in_schema=False)
def magic_form() -> RedirectResponse:
    return RedirectResponse("/#create", status_code=303)


@router.post("/magic", response_class=HTMLResponse, include_in_schema=False)
async def magic_account(request: Request, settings: SettingsDep, service: ServiceDep) -> str:
    await request_form(request, settings)
    account = await run_in_threadpool(service.create_managed_account, None)
    return _render_public_home(service, settings, account, None)


@router.post("/accounts", response_class=HTMLResponse, include_in_schema=False)
async def self_service_account(request: Request, settings: SettingsDep, service: ServiceDep) -> str:
    form = await request_form(request, settings)
    mode = first_form_value(form, "mode")
    if mode and mode != "managed":
        raise HTTPException(status_code=400, detail="custom hostnames are not supported; create a KarlDNS hostname and use a CNAME")
    if first_form_value(form, "hostname") or first_form_value(form, "claim_secret"):
        raise HTTPException(status_code=400, detail="custom hostnames are not supported; create a KarlDNS hostname and use a CNAME")
    account = await run_in_threadpool(service.create_managed_account, None)
    return _render_public_home(service, settings, account, None)


@router.get("/healthz", response_class=PlainTextResponse)
def healthz() -> str:
    return "ok"


@router.get("/ip", response_class=PlainTextResponse)
def visible_ip(request: Request, settings: SettingsDep) -> str:
    return client_ip(request, settings)


@router.get("/privacy", response_class=HTMLResponse, include_in_schema=False)
def privacy(settings: SettingsDep) -> str:
    return _render_privacy_page(settings)


@router.get("/robots.txt", response_class=PlainTextResponse, include_in_schema=False)
def robots_txt(settings: SettingsDep) -> str:
    base_url = settings.public_base_url.rstrip("/")
    admin_path = settings.admin_path.rstrip("/")
    return "\n".join(
        [
            "User-agent: *",
            f"Disallow: {admin_path}/",
            "Disallow: /m/",
            "Disallow: /u/",
            "Disallow: /nic/",
            "Disallow: /api/",
            "Disallow: /docs",
            "Disallow: /redoc",
            "Disallow: /openapi.json",
            f"Sitemap: {base_url}/sitemap.xml",
            "",
        ]
    )


@router.get("/sitemap.xml", include_in_schema=False)
def sitemap_xml(settings: SettingsDep) -> Response:
    base_url = settings.public_base_url.rstrip("/")
    body = f"""<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>{base_url}/</loc>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>
  <url>
    <loc>{base_url}/privacy</loc>
    <changefreq>monthly</changefreq>
    <priority>0.3</priority>
  </url>
</urlset>
"""
    return Response(body, media_type="application/xml")