from pytubefix import YouTube
from moviepy.editor import *
import sys
import os

def get_best_1080p_stream(streams):
    # Filter streams for 1080p or lower
    filtered_streams = streams.filter(adaptive=True,
                                   file_extension='mp4',
                                   only_video=True,
                                   resolution="1080p")

    # If no 1080p stream is found, get the next best quality below 1080p
    if not filtered_streams:
        filtered_streams = streams.filter(adaptive=True,
                                       file_extension='mp4',
                                       only_video=True)\
                                .order_by('resolution')\
                                .desc()

        # Filter out streams above 1080p
        filtered_streams = [s for s in filtered_streams if not s.resolution or
                          int(s.resolution[:-1]) <= 1080]

    return filtered_streams[0] if filtered_streams else None

def download_video(url):
    try:
        yt = YouTube(url)
        print(f"Title: {yt.title}")
        print("Starting download...")

        # Get the best video stream at 1080p or lower
        video_stream = get_best_1080p_stream(yt.streams)
        if not video_stream:
            print("Error: No suitable video stream found")
            sys.exit(1)

        # Get the highest quality audio stream
        audio_stream = yt.streams.filter(only_audio=True)\
                               .order_by('abr')\
                               .desc()\
                               .first()

        if video_stream and audio_stream:
            print(f"Selected video quality: {video_stream.resolution}")
            print(f"Selected audio quality: {audio_stream.abr}")

            # Create temporary filenames
            temp_video_path = 'temp_video2.mp4'
            temp_audio_path = 'temp_audio2.mp4'

            # Download both streams
            print(f"Downloading video...")
            video_stream.download(filename=temp_video_path)
            print(f"Downloading audio...")
            audio_stream.download(filename=temp_audio_path)

            # Prepare the final filename
            final_path = f"{yt.title}.mp4"
            # Remove invalid characters from filename
            final_path = "".join(c for c in final_path if c.isalnum() or c in (' ', '-', '_', '.'))

            print("Merging video and audio...")
            # Combine video and audio using moviepy
            video_clip = VideoFileClip(temp_video_path)
            audio_clip = AudioFileClip(temp_audio_path)

            final_clip = video_clip.set_audio(audio_clip)
            final_clip.write_videofile(final_path, codec='libx264', audio_codec='aac')

            # Clean up
            video_clip.close()
            audio_clip.close()
            os.remove(temp_video_path)
            os.remove(temp_audio_path)

            print(f"Download completed: {final_path}")

    except Exception as e:
        print(f"Error: Failed to download video: {str(e)}")
        sys.exit(1)

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("Usage: python script.py <youtube_url>")
        sys.exit(1)

    url = sys.argv[1]
    download_video(url)