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#!/usr/bin/env python3
"""Prepare and publish the completed HiQBind compact datasets to Hugging Face.

The published repository layout is intentionally simple and stable::

    README.md
    docs/
    code/compact_v1/
    data/hiqbind_5k_v1/
        autodock_vina_full_v1/
        diffdock_full_v1/

``--prepare`` makes a persistent local staging tree.  Tensor shards are
*hard-linked* from the completed local datasets, so the staging tree does not
duplicate the roughly 93 GB payload.  The two JSON files which could expose
local source paths (``manifest.json`` and ``source_index.json``) are copied
after recursively replacing absolute paths with a non-path marker.

``--upload`` accepts ``HF_TOKEN``, ``--token``, or a token saved by
``huggingface_hub.login()``.  It authenticates with ``whoami`` and checks the
target dataset repository before invoking ``HfApi.upload_large_folder``.  The
latter keeps its resume metadata below the staging tree, therefore retain the
same ``--stage-root`` if an upload is interrupted.

Examples
--------
Inspect without writing or contacting Hugging Face::

    /u/hhao/anaconda3/envs/hgf/bin/python upload_copuladock.py --prepare --dry-run

Build and inspect the reusable staging tree::

    /u/hhao/anaconda3/envs/hgf/bin/python upload_copuladock.py --prepare --verify

Upload after review (the token is intentionally not printed)::

    HF_TOKEN=... /u/hhao/anaconda3/envs/hgf/bin/python upload_copuladock.py \
        --prepare --verify --upload --num-workers 8
"""

from __future__ import annotations

import argparse
import json
import os
import shutil
import sys
from dataclasses import dataclass
from pathlib import Path
from typing import Any, Iterable, Mapping, Sequence


RELEASE_ROOT = Path(__file__).resolve().parent
PROJECT_ROOT = RELEASE_ROOT.parent
WORKSPACE_ROOT = PROJECT_ROOT.parent
DEFAULT_DATASET_ROOT = PROJECT_ROOT / "datasets_compact_hiqbind_v1"
DEFAULT_STAGE_ROOT = RELEASE_ROOT / "hf_stage_copuladock"
DEFAULT_REPO_ID = "liofoil/copuladock"


@dataclass(frozen=True)
class DatasetSpec:
    """A completed compact dataset and its release-relative destination."""

    source_name: str
    release_name: str


DATASETS: tuple[DatasetSpec, ...] = (
    DatasetSpec("autodock_vina_full_v1", "autodock_vina_full_v1"),
    DatasetSpec("diffdock_full_v1", "diffdock_full_v1"),
)

# These are the minimal reproducible construction/reader components.  They
# intentionally exclude raw docking outputs and cluster logs.
CODE_SOURCES: tuple[tuple[Path, Path], ...] = (
    (
        WORKSPACE_ROOT / "docking_base/scripts/materialize_hiqbind_gnncp.py",
        Path("code/compact_v1/materialize_hiqbind_gnncp.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/build_compact_v1_direct.py",
        Path("code/compact_v1/build_compact_v1_direct.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/build_compact_v1_direct.sbatch",
        Path("code/compact_v1/build_compact_v1_direct.sbatch"),
    ),
    (
        PROJECT_ROOT / "system_split_code/build_graph_unified_enhanced.py",
        Path("code/compact_v1/build_graph_unified_enhanced.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/convert_to_compact_v1.py",
        Path("code/compact_v1/convert_to_compact_v1.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/compact_graph_dataset.py",
        Path("code/compact_v1/compact_graph_dataset.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/build_system_index.py",
        Path("code/compact_v1/build_system_index.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/validate_compact_dataset.py",
        Path("code/compact_v1/validate_compact_dataset.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/smoke_test_compact_dataset.py",
        Path("code/compact_v1/smoke_test_compact_dataset.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/test_build_compact_v1_direct.py",
        # Keep tests alongside the modules they import.  The upstream tests
        # intentionally resolve convert_to_compact_v1.py by sibling path.
        Path("code/compact_v1/test_build_compact_v1_direct.py"),
    ),
    (
        PROJECT_ROOT / "system_split_code/test_compact_graph_dataset.py",
        Path("code/compact_v1/test_compact_graph_dataset.py"),
    ),
)

# Previous staging revisions placed the two tests under ``tests/``.  Prune
# only these exact, generated staging copies during --prepare so an old stage
# cannot publish duplicate stale tests.  No dataset data are ever removed.
OBSOLETE_STAGE_FILES: tuple[Path, ...] = (
    Path("code/compact_v1/tests/test_build_compact_v1_direct.py"),
    Path("code/compact_v1/tests/test_compact_graph_dataset.py"),
)


class ReleaseError(RuntimeError):
    """A release-preparation or release-verification failure."""


def _relative_to(path: Path, root: Path) -> Path:
    """Return ``path`` relative to ``root`` or raise a contextual error."""

    try:
        return path.relative_to(root)
    except ValueError as exc:
        raise ReleaseError(f"path escapes its expected root: {path} (root={root})") from exc


def _is_absolute_path_text(value: str) -> bool:
    """Detect POSIX/Windows-looking absolute paths without interpreting IDs."""

    return value.startswith("/") or (len(value) >= 3 and value[1:3] in (":\\", ":/"))


def _sanitize_value(value: Any) -> Any:
    """Copy JSON-like values while removing every absolute-path string."""

    if isinstance(value, dict):
        return {str(key): _sanitize_value(item) for key, item in value.items()}
    if isinstance(value, list):
        return [_sanitize_value(item) for item in value]
    if isinstance(value, str) and _is_absolute_path_text(value):
        return "<local-path-removed>"
    return value


def _find_absolute_path_values(value: Any, prefix: str = "$") -> list[str]:
    """Return JSON locations that still contain an absolute path string."""

    found: list[str] = []
    if isinstance(value, Mapping):
        for key, item in value.items():
            found.extend(_find_absolute_path_values(item, f"{prefix}.{key}"))
    elif isinstance(value, list):
        for index, item in enumerate(value):
            found.extend(_find_absolute_path_values(item, f"{prefix}[{index}]"))
    elif isinstance(value, str) and _is_absolute_path_text(value):
        found.append(prefix)
    return found


def _read_json(path: Path) -> Any:
    try:
        with path.open("r", encoding="utf-8") as handle:
            return json.load(handle)
    except (OSError, json.JSONDecodeError) as exc:
        raise ReleaseError(f"cannot read JSON {path}: {exc}") from exc


def _write_json(path: Path, payload: Any) -> None:
    """Write a small JSON file atomically inside the staging tree."""

    path.parent.mkdir(parents=True, exist_ok=True)
    temporary = path.with_name(path.name + ".tmp")
    try:
        with temporary.open("w", encoding="utf-8") as handle:
            json.dump(payload, handle, ensure_ascii=False, indent=2)
            handle.write("\n")
            handle.flush()
            os.fsync(handle.fileno())
        os.replace(temporary, path)
    finally:
        # If json.dump failed before os.replace, only remove the known temp file.
        if temporary.exists():
            temporary.unlink()


def _copy_file(source: Path, destination: Path) -> None:
    """Snapshot a small code/document file without following unsafe parents."""

    if not source.is_file():
        raise ReleaseError(f"required release file is missing: {source}")
    destination.parent.mkdir(parents=True, exist_ok=True)
    temporary = destination.with_name(destination.name + ".tmp")
    try:
        shutil.copy2(source, temporary)
        os.replace(temporary, destination)
    finally:
        if temporary.exists():
            temporary.unlink()


def _hardlink_file(source: Path, destination: Path) -> None:
    """Make one idempotent hard link; never silently copy a tensor shard."""

    if not source.is_file():
        raise ReleaseError(f"source file is missing: {source}")
    destination.parent.mkdir(parents=True, exist_ok=True)
    if destination.exists():
        source_stat = source.stat()
        destination_stat = destination.stat()
        if (source_stat.st_dev, source_stat.st_ino) == (destination_stat.st_dev, destination_stat.st_ino):
            return
        raise ReleaseError(
            "staging file already exists but is not the expected hard link; "
            f"refusing to replace it: {destination}"
        )
    try:
        os.link(source, destination)
    except OSError as exc:
        raise ReleaseError(
            "hard-link failed; staging and source must share a filesystem. "
            f"source={source}, destination={destination}: {exc}"
        ) from exc


def _dataset_source(dataset_root: Path, spec: DatasetSpec) -> Path:
    source = (dataset_root / spec.source_name).resolve()
    if not source.is_dir():
        raise ReleaseError(f"completed compact dataset is missing: {source}")
    manifest = source / "manifest.json"
    if not manifest.is_file():
        raise ReleaseError(f"completed compact dataset has no manifest: {manifest}")
    value = _read_json(manifest)
    if not isinstance(value, dict) or value.get("status") != "complete":
        raise ReleaseError(f"dataset is not a complete compact release: {source}")
    return source


def _release_dataset_root(stage_root: Path, spec: DatasetSpec) -> Path:
    return stage_root / "data" / "hiqbind_5k_v1" / spec.release_name


def _sanitized_json_payload(source: Path) -> Any:
    payload = _sanitize_value(_read_json(source))
    leftovers = _find_absolute_path_values(payload)
    if leftovers:
        raise ReleaseError(f"path sanitizer left absolute paths in {source}: {leftovers[:5]}")
    return payload


def _stage_dataset(source: Path, destination: Path) -> None:
    """Stage a compact dataset, hard-linking all immutable source artifacts."""

    for source_file in sorted(source.rglob("*")):
        if not source_file.is_file():
            continue
        relative = _relative_to(source_file, source)
        target = destination / relative
        # These two records contain source provenance.  Their release versions
        # preserve logical relative fields but never disclose local paths.
        if source_file.name in {"manifest.json", "source_index.json"}:
            _write_json(target, _sanitized_json_payload(source_file))
        else:
            _hardlink_file(source_file, target)


def _release_assets() -> list[tuple[Path, Path]]:
    """Discover authored release documents plus the static code mapping."""

    assets = list(CODE_SOURCES)

    # README is the Hugging Face dataset card.  Other authored Markdown files
    # are companion documents, keeping the remote root uncluttered.
    for source in sorted(RELEASE_ROOT.glob("*.md"), key=lambda item: item.name.casefold()):
        remote = Path("README.md") if source.name == "README.md" else Path("docs") / source.name
        assets.append((source, remote))

    # Release-authored companion docs and the small hand-written package notes
    # live in the release tree itself.  Include them recursively while
    # deliberately excluding generated __pycache__ / staging content.
    authored_docs = RELEASE_ROOT / "docs"
    if authored_docs.is_dir():
        for source in sorted(authored_docs.rglob("*"), key=lambda item: str(item).casefold()):
            if source.is_file() and "__pycache__" not in source.parts:
                assets.append((source, Path("docs") / _relative_to(source, authored_docs)))

    authored_code = RELEASE_ROOT / "code" / "compact_v1"
    if authored_code.is_dir():
        for source in sorted(authored_code.rglob("*"), key=lambda item: str(item).casefold()):
            if source.is_file() and "__pycache__" not in source.parts:
                assets.append((source, Path("code/compact_v1") / _relative_to(source, authored_code)))

    # A dependency file placed at the release root is also supported for
    # convenience; a code/compact_v1 version takes precedence by causing an
    # explicit duplicate-destination error rather than silent replacement.
    for name in ("requirements.txt", "environment.yml", "environment.yaml"):
        source = RELEASE_ROOT / name
        if source.is_file():
            assets.append((source, Path("code/compact_v1") / name))

    # Include the reproducible release entry points themselves, but not this
    # staging directory or arbitrary local files.
    for name in ("upload_copuladock.py", "upload_copuladock.sbatch"):
        source = RELEASE_ROOT / name
        if source.is_file():
            assets.append((source, Path("code/release") / name))

    return assets


def _stage_assets(stage_root: Path) -> list[Path]:
    staged: list[Path] = []
    seen_destinations: set[Path] = set()
    for source, remote in _release_assets():
        if remote in seen_destinations:
            raise ReleaseError(f"duplicate release destination: {remote}")
        seen_destinations.add(remote)
        if not source.is_file():
            raise ReleaseError(f"required construction code is missing: {source}")
        target = stage_root / remote
        _copy_file(source, target)
        staged.append(target)
    return staged


def _prune_obsolete_stage_files(stage_root: Path) -> None:
    """Remove only known stale generated code copies from an older layout."""

    for relative in OBSOLETE_STAGE_FILES:
        target = stage_root / relative
        if target.is_file():
            target.unlink()
        # Leave a directory untouched when it contains anything unexpected;
        # upload_large_folder ignores empty directories in any event.
        parent = target.parent
        if parent.is_dir() and not any(parent.iterdir()):
            parent.rmdir()


def _validate_stage_location(stage_root: Path, dataset_root: Path) -> None:
    """Prevent accidental recursive staging into either source dataset root."""

    stage_root = stage_root.resolve()
    dataset_root = dataset_root.resolve()
    if stage_root == dataset_root:
        raise ReleaseError("--stage-root must not equal --dataset-root")
    try:
        stage_root.relative_to(dataset_root)
    except ValueError:
        return
    raise ReleaseError("--stage-root must not be inside --dataset-root")


def _expected_tensor_files(source: Path) -> list[Path]:
    return sorted(path for path in source.rglob("*.pt") if path.is_file())


def _human_bytes(number: int) -> str:
    value = float(number)
    for suffix in ("B", "KiB", "MiB", "GiB", "TiB"):
        if value < 1024.0 or suffix == "TiB":
            return f"{value:.1f} {suffix}"
        value /= 1024.0
    return f"{number} B"


def _source_summary(dataset_root: Path) -> list[dict[str, Any]]:
    summary: list[dict[str, Any]] = []
    for spec in DATASETS:
        source = _dataset_source(dataset_root, spec)
        manifest = _read_json(source / "manifest.json")
        tensors = _expected_tensor_files(source)
        summary.append(
            {
                "name": spec.release_name,
                "source": str(source),
                "systems": int(manifest.get("n_systems", 0)),
                "graphs": int(manifest.get("n_graphs", 0)),
                "shards": len(tensors),
                "tensor_bytes": sum(path.stat().st_size for path in tensors),
            }
        )
    return summary


def prepare_stage(stage_root: Path, dataset_root: Path, *, dry_run: bool) -> None:
    """Create/update the reusable stage.  ``dry_run`` performs no writes."""

    _validate_stage_location(stage_root, dataset_root)
    summaries = _source_summary(dataset_root)
    assets = _release_assets()
    print(f"stage root: {stage_root}")
    for item in summaries:
        print(
            f"  {item['name']}: {item['systems']} systems, {item['graphs']} graphs, "
            f"{item['shards']} .pt shards, {_human_bytes(item['tensor_bytes'])}"
        )
    print(f"  construction/release files: {len(assets)}")
    if dry_run:
        print("dry-run: source checks passed; no staging files were created or changed.")
        return

    stage_root.mkdir(parents=True, exist_ok=True)
    for spec in DATASETS:
        _stage_dataset(_dataset_source(dataset_root, spec), _release_dataset_root(stage_root, spec))
    _stage_assets(stage_root)
    _prune_obsolete_stage_files(stage_root)
    print("staging preparation completed (tensor shards are hard links).")


def verify_stage(stage_root: Path, dataset_root: Path, *, require_readme: bool) -> None:
    """Check staging layout, sanitization, and every tensor hard link."""

    if not stage_root.is_dir():
        raise ReleaseError(f"staging root does not exist: {stage_root}")

    errors: list[str] = []
    checked_tensors = 0
    for spec in DATASETS:
        source = _dataset_source(dataset_root, spec)
        staged = _release_dataset_root(stage_root, spec)
        if not staged.is_dir():
            errors.append(f"missing staged dataset directory: {staged}")
            continue
        for name in ("manifest.json", "source_index.json", "system_index.json"):
            candidate = staged / name
            if not candidate.is_file():
                errors.append(f"missing staged metadata: {candidate}")

        for name in ("manifest.json", "source_index.json"):
            candidate = staged / name
            if candidate.is_file():
                try:
                    leftovers = _find_absolute_path_values(_read_json(candidate))
                except ReleaseError as exc:
                    errors.append(str(exc))
                else:
                    if leftovers:
                        errors.append(f"absolute paths remain in {candidate}: {leftovers[:5]}")

        for source_tensor in _expected_tensor_files(source):
            staged_tensor = staged / _relative_to(source_tensor, source)
            if not staged_tensor.is_file():
                errors.append(f"missing staged tensor: {staged_tensor}")
                continue
            source_stat = source_tensor.stat()
            staged_stat = staged_tensor.stat()
            if (source_stat.st_dev, source_stat.st_ino) != (staged_stat.st_dev, staged_stat.st_ino):
                errors.append(f"tensor is not a hard link: {staged_tensor}")
            if source_stat.st_size != staged_stat.st_size:
                errors.append(f"tensor size differs: {staged_tensor}")
            checked_tensors += 1

    for source, remote in _release_assets():
        staged_file = stage_root / remote
        if not staged_file.is_file():
            errors.append(f"missing staged release asset: {staged_file}")
        elif staged_file.stat().st_size != source.stat().st_size:
            errors.append(f"staged release asset size differs: {staged_file}")

    readme = stage_root / "README.md"
    if require_readme and not readme.is_file():
        errors.append("README.md is required before upload; add it under release_copuladock/")
    if errors:
        raise ReleaseError("staging verification failed:\n  - " + "\n  - ".join(errors))
    print(f"staging verification passed: {checked_tensors} tensor hard links checked; no local absolute paths in release metadata.")


def _get_token(args: argparse.Namespace) -> str:
    token = args.token or os.environ.get("HF_TOKEN")
    if token:
        return token
    try:
        from huggingface_hub import get_token
    except ImportError as exc:
        raise ReleaseError(
            "--upload requires --token/HF_TOKEN or a saved Hugging Face login; "
            "huggingface_hub is unavailable."
        ) from exc
    token = get_token()
    if not token:
        raise ReleaseError(
            "--upload requires --token, HF_TOKEN, or a saved Hugging Face login. "
            "Run `python -c 'from huggingface_hub import login; login()'` first."
        )
    return token


def upload_stage(args: argparse.Namespace) -> None:
    """Authenticate safely and perform the one resumable folder upload."""

    if args.dry_run:
        print(
            "dry-run: would verify credentials and call HfApi.upload_large_folder "
            f"for dataset repo {args.repo_id!r} from {args.stage_root}."
        )
        return
    token = _get_token(args)
    try:
        from huggingface_hub import HfApi
    except ImportError as exc:
        raise ReleaseError(
            "huggingface_hub is unavailable. Run with "
            "/u/hhao/anaconda3/envs/hgf/bin/python."
        ) from exc

    api = HfApi(token=token)
    try:
        account = api.whoami(token=token)
        api.repo_info(args.repo_id, repo_type="dataset", revision=args.revision, token=token)
    except Exception as exc:  # The Hub library exposes several transport/auth exception types.
        raise ReleaseError(
            f"cannot authenticate to or access dataset repository {args.repo_id!r}: {exc}"
        ) from exc
    # The user identity is useful operational evidence but contains no secret.
    account_name = account.get("name") if isinstance(account, Mapping) else None
    print(f"Hugging Face authentication verified for account: {account_name or '<unknown>'}")
    print(
        "starting resumable upload_large_folder: "
        f"repo={args.repo_id}, revision={args.revision}, workers={args.num_workers}"
    )
    try:
        api.upload_large_folder(
            repo_id=args.repo_id,
            folder_path=args.stage_root,
            repo_type="dataset",
            revision=args.revision,
            num_workers=args.num_workers,
            # upload_large_folder writes resumable state below .cache; it is
            # operational metadata, not part of the scientific release.
            ignore_patterns=[".cache/**", "**/__pycache__/**", "*.pyc", "*.tmp"],
            print_report=True,
        )
    except Exception as exc:
        raise ReleaseError(
            "Hugging Face upload did not complete. Keep the staging root unchanged and rerun "
            "the same command to resume: "
            f"{exc}"
        ) from exc
    print("upload_large_folder completed successfully.")


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument("--prepare", action="store_true", help="create/update the persistent staging tree")
    parser.add_argument("--verify", action="store_true", help="verify an existing staging tree")
    parser.add_argument("--upload", action="store_true", help="upload a verified staging tree to Hugging Face")
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="show prepare/upload actions without staging writes or network access",
    )
    parser.add_argument("--repo-id", default=DEFAULT_REPO_ID, help=f"target dataset repo (default: {DEFAULT_REPO_ID})")
    parser.add_argument("--revision", default="main", help="target revision (default: main)")
    parser.add_argument("--dataset-root", type=Path, default=DEFAULT_DATASET_ROOT)
    parser.add_argument("--stage-root", type=Path, default=DEFAULT_STAGE_ROOT)
    parser.add_argument("--num-workers", type=int, default=8, help="upload_large_folder worker count (default: 8)")
    parser.add_argument("--token", help="Hugging Face token; prefer HF_TOKEN in a job environment")
    return parser


def main(argv: Sequence[str] | None = None) -> int:
    args = build_parser().parse_args(argv)
    if not (args.prepare or args.verify or args.upload):
        raise ReleaseError("select at least one action: --prepare, --verify, and/or --upload")
    if args.num_workers < 1:
        raise ReleaseError("--num-workers must be at least 1")
    args.dataset_root = args.dataset_root.expanduser().resolve()
    args.stage_root = args.stage_root.expanduser().resolve()

    if args.prepare:
        prepare_stage(args.stage_root, args.dataset_root, dry_run=args.dry_run)
    if args.verify or args.upload:
        # A dry-run upload has no staging side effects, but validates a real
        # stage when one is already present.  This catches layout mistakes
        # before credentials/network access are involved.
        verify_stage(args.stage_root, args.dataset_root, require_readme=args.upload and not args.dry_run)
    if args.upload:
        upload_stage(args)
    return 0


if __name__ == "__main__":
    try:
        raise SystemExit(main())
    except ReleaseError as exc:
        print(f"ERROR: {exc}", file=sys.stderr)
        raise SystemExit(2)