# /// script
# requires-python = ">=3.11"
# dependencies = [
#     "datasets",
#     "huggingface-hub[hf_transfer]",
#     "pdfplumber",
# ]
# ///
"""
Convert a directory of PDF files to a Hugging Face dataset.

This script uses the built-in PDF support in the datasets library to create
a dataset from PDF files. Each PDF is converted to images (one per page).

Example usage:
    # Basic usage - convert PDFs in a directory
    uv run pdf-to-dataset.py /path/to/pdfs username/my-dataset

    # Create a private dataset
    uv run pdf-to-dataset.py /path/to/pdfs username/my-dataset --private

    # Organize by subdirectories (creates labels)
    # folder/invoice/doc1.pdf -> label: invoice
    # folder/receipt/doc2.pdf -> label: receipt
    uv run pdf-to-dataset.py /path/to/organized-pdfs username/categorized-pdfs
"""

import logging
import os
import sys
from argparse import ArgumentParser, RawDescriptionHelpFormatter
from pathlib import Path

from datasets import load_dataset
from huggingface_hub import login

logging.basicConfig(
    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)


def validate_directory(directory: Path) -> int:
    """Validate directory and count PDF files."""
    if not directory.exists():
        raise ValueError(f"Directory does not exist: {directory}")

    if not directory.is_dir():
        raise ValueError(f"Path is not a directory: {directory}")

    # Count PDFs (including in subdirectories)
    pdf_count = len(list(directory.rglob("*.pdf")))

    if pdf_count == 0:
        raise ValueError(f"No PDF files found in directory: {directory}")

    return pdf_count


def main():
    parser = ArgumentParser(
        description="Convert PDF files to Hugging Face datasets",
        formatter_class=RawDescriptionHelpFormatter,
        epilog=__doc__,
    )

    parser.add_argument("directory", type=Path, help="Directory containing PDF files")
    parser.add_argument(
        "repo_id",
        type=str,
        help="Hugging Face dataset repository ID (e.g., 'username/dataset-name')",
    )
    parser.add_argument(
        "--private", action="store_true", help="Create a private dataset repository"
    )
    parser.add_argument(
        "--hf-token",
        type=str,
        default=None,
        help="Hugging Face API token (can also use HF_TOKEN environment variable)",
    )

    args = parser.parse_args()

    # Handle authentication
    hf_token = args.hf_token or os.environ.get("HF_TOKEN")
    if hf_token:
        login(token=hf_token)
    else:
        logger.info("No HF token provided. Will attempt to use cached credentials.")

    try:
        # Validate directory
        pdf_count = validate_directory(args.directory)
        logger.info(f"Found {pdf_count} PDF files to process")

        # Load dataset using built-in PDF support
        logger.info("Loading PDFs as dataset (this may take a while for large PDFs)...")
        dataset = load_dataset("pdffolder", data_dir=str(args.directory))

        # Log dataset info
        logger.info("\nDataset created successfully!")
        logger.info(f"Structure: {dataset}")

        if "train" in dataset:
            train_size = len(dataset["train"])
            logger.info(f"Training examples: {train_size}")

            # Show sample if available
            if train_size > 0:
                sample = dataset["train"][0]
                logger.info(f"\nSample structure: {list(sample.keys())}")
                if "label" in sample:
                    logger.info("Labels found - PDFs are organized by category")

        # Push to Hub
        logger.info(f"\nPushing to Hugging Face Hub: {args.repo_id}")
        dataset.push_to_hub(args.repo_id, private=args.private)

        logger.info("✅ Dataset uploaded successfully!")
        logger.info(f"🔗 Available at: https://huggingface.co/datasets/{args.repo_id}")

        # Provide next steps
        logger.info("\nTo use your dataset:")
        logger.info(f'  dataset = load_dataset("{args.repo_id}")')

    except Exception as e:
        logger.error(f"Failed to create dataset: {e}")
        sys.exit(1)


if __name__ == "__main__":
    if len(sys.argv) == 1:
        # Show help if no arguments provided
        print(__doc__)
        sys.exit(0)

    main()