import asyncio
import json
from datetime import datetime, timedelta
from typing import List
import dropbox
import logging
from modules.dropbox.client import dbx
from modules.video.model import VideoMetadata

# Initialize logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

# Dropbox client (already configured)
# dbx = dropbox.Dropbox(app_key=APP_KEY, app_secret=APP_SECRET, oauth2_refresh_token=REFRESH_TOKEN)

# Cache dictionary
# Key: scripture_name, Value: {"timestamp": datetime, "data": List[VideoMetadata]}
_video_cache: dict[str, dict] = {}
CACHE_TTL = timedelta(hours=1)  # Cache time-to-live

async def fetch_video_urls_from_dropbox(scripture_name: str) -> list[VideoMetadata]:
    """
    Fetch video metadata JSON from Dropbox with caching.

    :param scripture_name: Name of the scripture folder in Dropbox
    :return: List of VideoMetadata objects
    """
    loop = asyncio.get_running_loop()

    # Check if we have cached data that is still fresh
    cache_entry = _video_cache.get(scripture_name)
    if cache_entry:
        age = datetime.now() - cache_entry["timestamp"]
        if age < CACHE_TTL:
            logger.info(f"Using cached video metadata for '{scripture_name}' (age: {age})")
            return cache_entry["data"]

    logger.info(f"Fetching video metadata for '{scripture_name}' from Dropbox")
    try:
        # Dropbox SDK is synchronous, run in executor
        metadata, res = await loop.run_in_executor(
            None, dbx.files_download, f"/{scripture_name}/video_metadata.json"
        )
        data = res.content.decode("utf-8")
        # logger.info("video data = %s",data)
        json_list = json.loads(data)

        # Convert each JSON item to VideoMetadata
        video_data = [VideoMetadata(**item) for item in json_list]

        # Update cache
        _video_cache[scripture_name] = {
            "timestamp": datetime.now(),
            "data": video_data
        }
        logger.info(f"Cached {len(video_data)} videos for '{scripture_name}'")
        return video_data

    except Exception as e:
        logger.error(f"Error fetching video metadata for '{scripture_name}' from Dropbox", exc_info=e)
        # Fallback to cached data if available
        if cache_entry:
            logger.warning(f"Returning stale cached data for '{scripture_name}' due to Dropbox error")
            return cache_entry["data"]
        else:
            logger.warning(f"No cached data available for '{scripture_name}', returning empty list")
            return []