import argparse
import os
from huggingface_hub import upload_file, hf_hub_download, create_repo
import time
import math
from pathlib import Path
import subprocess

def split_large_file(file_path, chunk_size_mb=1000):
    """Split a large file into smaller chunks."""
    file_path = Path(file_path)
    file_size = os.path.getsize(file_path) / (1024 * 1024)  # Size in MB
    
    if file_size <= chunk_size_mb:
        print(f"File {file_path.name} is {file_size:.2f}MB, no need to split.")
        return [file_path]
    
    # Create a directory for chunks if it doesn't exist
    chunks_dir = file_path.parent / f"{file_path.stem}_chunks"
    os.makedirs(chunks_dir, exist_ok=True)
    
    # Calculate number of chunks needed
    num_chunks = math.ceil(file_size / chunk_size_mb)
    print(f"Splitting {file_path.name} ({file_size:.2f}MB) into {num_chunks} chunks...")
    
    # Use split command for efficient splitting
    chunk_prefix = chunks_dir / file_path.stem
    subprocess.run([
        "split", 
        "-b", f"{chunk_size_mb}m", 
        str(file_path), 
        f"{chunk_prefix}_part_"
    ])
    
    # Get all chunk files
    chunk_files = sorted(chunks_dir.glob(f"{file_path.stem}_part_*"))
    print(f"Created {len(chunk_files)} chunk files in {chunks_dir}")
    return chunk_files

def upload_files(api_token, repo_id):
    # Create the repository first if it doesn't exist
    try:
        create_repo(
            repo_id=repo_id,
            token=api_token,
            repo_type="dataset",
            private=False  # Set to False for a public dataset
        )
        print(f"Created repository: {repo_id}")
    except Exception as e:
        print(f"Repository already exists or error occurred: {e}")
    
    # Add a delay to ensure repository creation is complete
    time.sleep(5)

    # Upload the script itself
    try:
        script_path = "1_hf_up_and_download.py"
        print(f"Uploading script: {script_path}")
        upload_file(
            repo_id=repo_id,
            path_or_fileobj=script_path,
            path_in_repo=script_path,
            token=api_token,
            repo_type="dataset",
        )
        print(f"Uploaded {script_path} to {repo_id}/{script_path}")
    except Exception as e:
        print(f"Upload failed for script: {e}")

    # Split the large file into chunks if needed
    local_file = "pdfs.tar.gz"
    chunk_files = split_large_file(local_file)
    
    # Upload each chunk
    for i, chunk_file in enumerate(chunk_files):
        try:
            repo_file = chunk_file.name
            print(f"Uploading chunk {i+1}/{len(chunk_files)}: {repo_file}")
            
            upload_file(
                repo_id=repo_id,
                path_or_fileobj=str(chunk_file),
                path_in_repo=repo_file,
                token=api_token,
                repo_type="dataset",
            )
            print(f"Uploaded {chunk_file} to {repo_id}/{repo_file}")
        except Exception as e:
            print(f"Upload failed for {chunk_file}: {e}")

def download_files(api_token, repo_id):
    # Check if we have split files
    try:
        # List files in the repository
        from huggingface_hub import list_repo_files
        files = list_repo_files(repo_id=repo_id, repo_type="dataset", token=api_token)
        
        # Filter for our chunk files
        chunk_files = [f for f in files if f.startswith("pdfs_part_") or "chunks" in f]
        
        if chunk_files:
            print(f"Found {len(chunk_files)} chunk files. Downloading...")
            os.makedirs("chunks", exist_ok=True)
            
            for file in chunk_files:
                downloaded_path = hf_hub_download(
                    repo_id=repo_id,
                    filename=file,
                    token=api_token,
                    repo_type="dataset",
                    local_dir="chunks",
                    local_dir_use_symlinks=False
                )
                print(f"Downloaded {file} to {downloaded_path}")
            
            print("To combine chunks, use: cat chunks/pdfs_part_* > pdfs.tar.gz")
            return
    except Exception as e:
        print(f"Error checking for chunk files: {e}")
    
    # Fall back to downloading the single file if no chunks found
    try:
        downloaded_path = hf_hub_download(
            repo_id=repo_id,
            filename="pdfs.tar.gz",
            token=api_token,
            repo_type="dataset",
            local_dir=".",
            local_dir_use_symlinks=False
        )
        print(f"Downloaded pdfs.tar.gz file to {downloaded_path}")
    except Exception as e:
        print(f"Download failed: {e}")

def main():
    parser = argparse.ArgumentParser(
        description="Upload or download files to/from a remote Hugging Face dataset."
    )
    parser.add_argument(
        "operation",
        choices=["upload", "download"],
        help="Specify the operation: upload or download."
    )
    args = parser.parse_args()

    # Try to get API token from environment variables or HF cache
    API_TOKEN = os.environ.get("HUGGINGFACE_API_TOKEN")
    if not API_TOKEN:
        API_TOKEN = os.environ.get("HUGGINGFACEHUB_API_TOKEN")
        if not API_TOKEN:
            try:
                from huggingface_hub.constants import HF_TOKEN_PATH
                if os.path.exists(HF_TOKEN_PATH):
                    with open(HF_TOKEN_PATH, "r") as f:
                        API_TOKEN = f.read().strip()
            except ImportError:
                pass
            
            if not API_TOKEN:
                raise ValueError("No Hugging Face API token found. Please set HUGGINGFACE_API_TOKEN environment variable or login using `huggingface-cli login`")
    
    # Include your username in the repo_id
    username = "liuganghuggingface"  # Replace with your actual Hugging Face username
    repo_id = f"{username}/polymer_semantic_pdfs"

    if args.operation == "upload":
        upload_files(API_TOKEN, repo_id)
    elif args.operation == "download":
        download_files(API_TOKEN, repo_id)

if __name__ == "__main__":
    main()