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

def app_version(request):
    version_file = Path(__file__).resolve().parent.parent / "version.txt"
    try:
        with open(version_file, "r") as f:
            version = f.read().strip()
    except FileNotFoundError:
        version = "v0.0.0"
    return {"APP_VERSION": version}

def available_themes(request):
    """Returns ['midnight','dawn','forest','sandstone', ...] by scanning /static/themes/*.css"""
    names = []
    # Find the absolute path for the 'themes' directory via staticfiles finders
    # We look for any 'themes' folder that exists and aggregate CSS files.
    for finder in finders.get_finders():
        for path, storage in finder.list(['themes']):
            if path.startswith('themes/') and path.endswith('.css'):
                base = os.path.basename(path)[:-4]  # strip .css
                names.append(base)
    # stable order
    names = sorted(set(names))
    return {'available_themes': names}

def pending_announcement(request):
    """
    Expose the latest active, current announcement the user has not dismissed.
    We'll only use it on the Search page via include.
    """
    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}