from pathlib import Path
from django.contrib.staticfiles import finders
from .models_ann import Announcement, AnnouncementDismissal
import os

def app_version(request):
    version_file = Path(__file__).resolve().parent.parent / "version.txt"
    try:
        return {"APP_VERSION": version_file.read_text(encoding="utf-8").strip()}
    except FileNotFoundError:
        return {"APP_VERSION": "v0.0.0"}

def available_themes(request):
    """
    Return clean theme names by scanning ONLY /static/themes/*.css.
    Ignore admin css and fingerprinted variants.
    """
    bases = set()

    for finder in finders.get_finders():
        try:
            for path, storage in finder.list(['themes']):   # only look under themes/
                if not path.startswith('themes/'):
                    continue
                if not path.endswith('.css'):
                    continue
                filename = os.path.basename(path)[:-4]      # drop .css
                base = filename.split('.', 1)[0]            # drop fingerprint
                if base:
                    bases.add(base)
        except Exception:
            pass

    preferred = ["classic", "dawn", "forest", "midnight", "mint", "sandstone", "original"]
    names = sorted(
        bases,
        key=lambda n: (preferred.index(n) if n in preferred else len(preferred) + 1, n)
    )
    return {"available_themes": names}

def pending_announcement(request):
    user = getattr(request, "user", None)
    if not (user and user.is_authenticated):
        return {"pending_announcement": None}

    current = [a for a in Announcement.objects.all() if a.is_current()]
    for a in current:
        if not AnnouncementDismissal.objects.filter(user=user, announcement=a).exists():
            return {"pending_announcement": a}
    return {"pending_announcement": None}