import os
import datetime
import pickle
from googleapiclient.discovery import build
import subprocess
from google.auth.transport.requests import Request

# Output directory for Emby
OUTPUT_DIR = "/media/media/YouTube"

# Days to look back for videos
DAYS_BACK = 5

# Token file
TOKEN_FILE = "youtube_token.pickle"

def authenticate_with_token():
    """Authenticate using the saved token."""
    if not os.path.exists(TOKEN_FILE):
        raise FileNotFoundError(f"Token file '{TOKEN_FILE}' not found. Please run the token retrieval script first.")

    with open(TOKEN_FILE, "rb") as token:
        creds = pickle.load(token)

    # Refresh the token if needed
    if creds and creds.expired and creds.refresh_token:
        creds.refresh(Request())

    youtube = build("youtube", "v3", credentials=creds)
    return youtube

def get_subscribed_channels(youtube):
    """Fetch the list of subscribed channels."""
    channels = []
    request = youtube.subscriptions().list(
        part="snippet",
        mine=True,
        maxResults=50
    )
    while request:
        response = request.execute()
        for item in response["items"]:
            channels.append(item["snippet"]["resourceId"]["channelId"])
        request = youtube.subscriptions().list_next(request, response)
    return channels

def get_recent_videos(youtube, channel_id):
    """Fetch videos from a channel published in the last `DAYS_BACK` days."""
    recent_videos = []
    published_after = (datetime.datetime.now() - datetime.timedelta(days=DAYS_BACK)).isoformat("T") + "Z"
    
    request = youtube.search().list(
        part="snippet",
        channelId=channel_id,
        publishedAfter=published_after,
        maxResults=50,
        type="video",
        order="date"
    )
    response = request.execute()
    for item in response["items"]:
        recent_videos.append({
            "video_id": item["id"]["videoId"],
            "title": item["snippet"]["title"],
            "description": item["snippet"]["description"],
            "published_at": item["snippet"]["publishedAt"],
            "channel_title": item["snippet"]["channelTitle"]
        })
    return recent_videos

def download_video(video_id, output_path):
    """Download a YouTube video using yt-dlp."""
    command = [
        "yt-dlp",
        f"https://www.youtube.com/watch?v={video_id}",
        "-o", os.path.join(output_path, "%(title)s.%(ext)s")
    ]
    subprocess.run(command, check=True)

def create_nfo_file(video_data, file_path):
    """Create an Emby-compatible NFO file."""
    nfo_content = f"""<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<movie>
  <title>{video_data['title']}</title>
  <plot>{video_data['description']}</plot>
  <year>{video_data['published_at'][:4]}</year>
  <premiered>{video_data['published_at']}</premiered>
  <studio>{video_data['channel_title']}</studio>
</movie>
"""
    with open(file_path, "w", encoding="utf-8") as nfo_file:
        nfo_file.write(nfo_content)

def main():
    # Authenticate YouTube API
    print("Authenticating with token...")
    youtube = authenticate_with_token()

    if not os.path.exists(OUTPUT_DIR):
        os.makedirs(OUTPUT_DIR)
    
    # Fetch subscribed channels
    print("Fetching subscribed channels...")
    channels = get_subscribed_channels(youtube)
    
    # Fetch and process recent videos
    for channel_id in channels:
        print(f"Fetching recent videos for channel: {channel_id}")
        videos = get_recent_videos(youtube, channel_id)
        
        for video in videos:
            print(f"Processing video: {video['title']}")
            # Create a folder for the video
            video_dir = os.path.join(OUTPUT_DIR, video["title"].replace("/", "_"))
            os.makedirs(video_dir, exist_ok=True)
            
            # Download the video
            download_video(video["video_id"], video_dir)
            
            # Create the NFO file
            nfo_file_path = os.path.join(video_dir, "movie.nfo")
            create_nfo_file(video, nfo_file_path)
    
    print("All videos processed successfully!")

if __name__ == "__main__":
    main()