from django.http import JsonResponse
from django.shortcuts import render

from .models import PortfolioEntry, Region


def home(request):
    return render(request, "showcase/home.html")


def _serialize_entry(entry):
    return {
        "id": entry.id,
        "type": entry.entry_type,
        "title": entry.title,
        "organization": entry.organization,
        "startDate": entry.start_date.isoformat() if entry.start_date else None,
        "endDate": entry.end_date.isoformat() if entry.end_date else None,
        "summary": entry.summary,
        "url": entry.url,
    }


def map_regions(request):
    entries = PortfolioEntry.objects.filter(is_published=True).prefetch_related("regions")
    entries_by_region = {}
    for entry in entries:
        payload = _serialize_entry(entry)
        for region in entry.regions.all():
            entries_by_region.setdefault(region.code, {})[entry.id] = payload

    regions = list(Region.objects.select_related("parent").prefetch_related("subdivisions"))
    payload = []
    for region in regions:
        related = dict(entries_by_region.get(region.code, {}))
        if region.level == Region.Level.COUNTRY:
            for subdivision in region.subdivisions.all():
                related.update(entries_by_region.get(subdivision.code, {}))

        payload.append(
            {
                "code": region.code,
                "name": region.name,
                "level": region.level,
                "parentCode": region.parent_id,
                "entries": list(related.values()),
            }
        )

    return JsonResponse({"regions": payload})