# utils.py
import os
from werkzeug.utils import secure_filename
from datetime import datetime
from models import Photo, Like
from database import db

ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'webp'}

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

def save_photo(file, upload_folder):
    if file and allowed_file(file.filename):
        filename = secure_filename(file.filename)
        timestamp = datetime.now().strftime('%Y%m%d_%H%M%S_')
        filename = timestamp + filename
        filepath = os.path.join(upload_folder, filename)
        file.save(filepath)
        return filename
    return None

def get_trending_photos(limit=3):
    # Ambil foto dengan like terbanyak
    return Photo.query.order_by(Photo.likes_count.desc()).limit(limit).all()