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import os
import streamlit as st
from pySmartDL import SmartDL
import platform

def get_default_download_folder():
    system_platform = platform.system()
    if system_platform == "Windows":
        return os.path.join(os.path.expanduser("~"), "Downloads")
    elif system_platform == "Linux":
        return os.path.join(os.path.expanduser("~"), "Downloads")
    elif system_platform == "Darwin":
        return os.path.join(os.path.expanduser("~"), "Downloads")
    elif system_platform == "Android":
        return "/storage/emulated/0/Download"  # Default Downloads folder path on Android
    else:
        raise NotImplementedError("Platform not supported")

def download_video(url):
    try:
        # Create a SmartDL object with the video URL
        dl = SmartDL(url, progress_bar=False)
        # Start the download
        dl.start()
        # Get the destination path where the file was downloaded
        dest_path = dl.get_dest()
        # Move the downloaded file to the default download folder
        default_download_folder = get_default_download_folder()
        os.rename(dest_path, os.path.join(default_download_folder, os.path.basename(dest_path)))
        st.success("Video downloaded successfully!")
    except Exception as e:
        st.error(f"An error occurred: {e}")

def main():
    st.title("YouTube Video Downloader")
    
    # Input field for entering YouTube URL
    video_url = st.text_input("Enter YouTube URL:")
    
    # Button to trigger the download
    if st.button("Download"):
        if video_url.strip() == "":
            st.warning("Please enter a valid YouTube URL.")
        else:
            # Download the video to the default download folder
            download_video(video_url)

if __name__ == "__main__":
    main()