"""
Upload G.U.I.D.E. inference model weights to Hugging Face Model Hub.

Uploads only the files needed for inference — skips checkpoint-* subdirectories
(intermediate training snapshots) and .DS_Store files.

Usage:
    python scripts/upload_models_to_hub.py --repo-id <username>/guide-models

Prerequisites:
    huggingface-cli login   # run once before uploading
"""

from __future__ import annotations

import argparse
import logging
import sys
from pathlib import Path

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

_REPO_ROOT = Path(__file__).parent.parent
_MODELS_ROOT = _REPO_ROOT / "models"

_MODEL_SUBDIRS = [
    "domain_classifier",
    "evidence_ner",
    "next_action",
]


def parse_args() -> argparse.Namespace:
    """Parse CLI arguments; exits with usage message if --repo-id is missing."""
    parser = argparse.ArgumentParser(
        description="Upload G.U.I.D.E. model weights to Hugging Face Model Hub.",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog=(
            "examples:\n"
            "  python scripts/upload_models_to_hub.py --repo-id myuser/guide-models\n"
        ),
    )
    parser.add_argument(
        "--repo-id",
        required=True,
        metavar="USER/REPO",
        help="HF Hub repo ID to upload to (e.g. myuser/guide-models)",
    )
    return parser.parse_args()


def filter_inference_files(model_dir: Path) -> list[Path]:
    """
    Return only the inference-needed files directly under model_dir.

    Skips:
    - Any file inside a checkpoint-* subdirectory (training artifacts)
    - Any .DS_Store file

    Args:
        model_dir: Path to a model directory (e.g. models/evidence_ner).

    Returns:
        List of Path objects for files that should be uploaded.
    """
    results: list[Path] = []
    for path in model_dir.rglob("*"):
        if not path.is_file():
            continue
        if path.name == ".DS_Store":
            continue
        # Skip anything inside a checkpoint-* directory
        if any(part.startswith("checkpoint-") for part in path.relative_to(model_dir).parts):
            continue
        results.append(path)
    return results


def upload_models(repo_id: str) -> None:
    """
    Upload inference files for all three G.U.I.D.E. models to HF Hub.

    Iterates over domain_classifier/, evidence_ner/, and next_action/ under
    models/, filters to inference-only files via filter_inference_files(), and
    uploads each file preserving its path relative to models/ as the Hub path.
    Logs a warning and continues if a model directory does not exist locally.

    Args:
        repo_id: HF Hub repository ID, e.g. "myuser/guide-models".
    """
    try:
        from huggingface_hub import HfApi
        from huggingface_hub.utils import HfHubHTTPError
    except ImportError:
        logger.error("huggingface_hub is not installed. Run: pip install huggingface_hub")
        sys.exit(1)

    api = HfApi()

    # Verify auth before doing any work
    try:
        api.whoami()
    except HfHubHTTPError:
        logger.error(
            "Not authenticated with Hugging Face. Run: huggingface-cli login"
        )
        sys.exit(1)

    # Ensure repo exists (creates it if not)
    api.create_repo(repo_id=repo_id, repo_type="model", exist_ok=True)
    logger.info("Uploading to: https://huggingface.co/%s", repo_id)

    total_uploaded = 0

    for subdir_name in _MODEL_SUBDIRS:
        model_dir = _MODELS_ROOT / subdir_name
        if not model_dir.exists():
            logger.warning("Model directory not found, skipping: %s", model_dir)
            continue

        files = filter_inference_files(model_dir)
        if not files:
            logger.warning("No inference files found in %s, skipping.", model_dir)
            continue

        logger.info("Uploading %d file(s) from %s …", len(files), subdir_name)
        for local_path in files:
            # Hub path mirrors local structure: domain_classifier/config.json etc.
            path_in_repo = local_path.relative_to(_MODELS_ROOT).as_posix()
            api.upload_file(
                path_or_fileobj=str(local_path),
                path_in_repo=path_in_repo,
                repo_id=repo_id,
                repo_type="model",
            )
            logger.info("  uploaded: %s", path_in_repo)
            total_uploaded += 1

    logger.info("Done. %d file(s) uploaded to %s", total_uploaded, repo_id)


if __name__ == "__main__":
    args = parse_args()
    upload_models(args.repo_id)