from django.conf import settings
from django.core.paginator import EmptyPage, PageNotAnInteger, Paginator
from django.shortcuts import render
from wagtail.models import Page
from wagtail.search.models import Query

from bakerydemo.blog.models import BlogPage
from bakerydemo.breads.models import BreadPage
from bakerydemo.locations.models import LocationPage


def search(request):
    # Search
    search_query = request.GET.get("q", None)
    if search_query:
        if "elasticsearch" in settings.WAGTAILSEARCH_BACKENDS["default"]["BACKEND"]:
            # In production, use ElasticSearch and a simplified search query, per
            # https://docs.wagtail.org/en/stable/topics/search/backends.html
            # like this:
            search_results = Page.objects.live().search(search_query)
        else:
            # If we aren't using ElasticSearch for the demo, fall back to native db search.
            # But native DB search can't search specific fields in our models on a `Page` query.
            # So for demo purposes ONLY, we hard-code in the model names we want to search.
            blog_results = BlogPage.objects.live().search(search_query)
            blog_page_ids = [p.page_ptr.id for p in blog_results]

            bread_results = BreadPage.objects.live().search(search_query)
            bread_page_ids = [p.page_ptr.id for p in bread_results]

            location_results = LocationPage.objects.live().search(search_query)
            location_result_ids = [p.page_ptr.id for p in location_results]

            page_ids = blog_page_ids + bread_page_ids + location_result_ids
            search_results = Page.objects.live().filter(id__in=page_ids)

        query = Query.get(search_query)

        # Record hit
        query.add_hit()

    else:
        search_results = Page.objects.none()

    # Pagination
    page = request.GET.get("page", 1)
    paginator = Paginator(search_results, 10)
    try:
        search_results = paginator.page(page)
    except PageNotAnInteger:
        search_results = paginator.page(1)
    except EmptyPage:
        search_results = paginator.page(paginator.num_pages)

    return render(
        request,
        "search/search_results.html",
        {
            "search_query": search_query,
            "search_results": search_results,
        },
    )