from __future__ import annotations

import urllib.parse
import httpx
from django.conf import settings
from django.http import (
    HttpRequest,
    HttpResponse,
    HttpResponseBase,
    HttpResponseRedirect,
)
from django.template import engines
from django.template.response import TemplateResponse
from django.views.generic import TemplateView


def catchall_dev(request: HttpRequest) -> HttpResponseBase:
    """Proxy the react dev-server."""
    # Validate the request.path to ensure it's safe
    # For example, ensure it does not contain "..", which could lead to directory
    # traversal Adjust the regex pattern according to your application's routing
    # scheme
    uri = urllib.parse.urlsplit(
        request.build_absolute_uri(request.get_full_path_info()),
    )
    if uri.hostname != "localhost":
        port = "" if uri.port is None else f":{uri.port}"
        return HttpResponseRedirect(uri._replace(netloc=f"localhost{port}").geturl())
    query_string = request.META["QUERY_STRING"]
    upstream = "http://localhost:5173"
    try:
        response = httpx.get(
            upstream + request.path + (f"?{query_string}" if query_string else ""),
        )
    except httpx.RequestError as e:
        raise RuntimeError(
            f"you need to run `npm start` in the {settings.FRONTEND_DIR} directory",
        ) from e
    content_type = response.headers.get("Content-Type")

    if content_type is not None and content_type.lower() == "text/html; charset=utf-8":
        tr = TemplateResponse(
            template=engines["django"].from_string(response.text),  # type: ignore[arg-type]
            request=request,
            content_type=content_type,
            status=response.status_code,
        )
        tr.reason_phrase = response.reason_phrase
        return tr
    return HttpResponse(
        content=response.content,
        content_type=content_type,
        status=response.status_code,
        reason=response.reason_phrase,
    )


catchall_prod = TemplateView.as_view(
    template_name="index.html",
)


def catchall(request: HttpRequest) -> HttpResponseBase:
    """Catchall view for the frontend."""
    return catchall_dev(request) if settings.DEVELOPMENT else catchall_prod(request)