from __future__ import annotations

from django.core.paginator import EmptyPage, PageNotAnInteger, Paginator
from django.http import HttpRequest, HttpResponse
from django.template.response import TemplateResponse

from apps.blog.models import ArticlePage

RESULTS_PER_PAGE = 12
MAX_QUERY_LENGTH = 200


def search(request: HttpRequest) -> HttpResponse:
    query = request.GET.get("q", "").strip()[:MAX_QUERY_LENGTH]
    results_page = None
    paginator = None

    if query:
        results = (
            ArticlePage.objects.live()
            .public()
            .select_related("author", "category")
            .prefetch_related("tags__metadata")
            .search(query)
        )
        paginator = Paginator(results, RESULTS_PER_PAGE)
        page_num = request.GET.get("page")
        try:
            results_page = paginator.page(page_num)
        except PageNotAnInteger:
            results_page = paginator.page(1)
        except EmptyPage:
            results_page = paginator.page(paginator.num_pages)

    return TemplateResponse(
        request,
        "blog/search_results.html",
        {
            "query": query,
            "results": results_page,
            "paginator": paginator,
        },
    )