#!/usr/bin/env python3
"""Validate the deterministic pre-upload Hugging Face handoff contract."""

from __future__ import annotations

import argparse
import json
import re
from pathlib import Path

import yaml


LICENSE_ID = "cc-by-4.0"
LICENSE_SPDX = "CC-BY-4.0"
LICENSE_URL = "https://creativecommons.org/licenses/by/4.0/"
CORE_VERSION = "http://mlcommons.org/croissant/1.1"
RAI_FIELDS = {
    "rai:dataLimitations",
    "rai:dataBiases",
    "rai:personalSensitiveInformation",
    "rai:dataUseCases",
    "rai:dataSocialImpact",
    "rai:hasSyntheticData",
    "prov:wasDerivedFrom",
    "prov:wasGeneratedBy",
}
NONPUBLIC_REPOSITORY_URL = re.compile(
    r"https://github\.com/[^\s\"']+/[^/\s\"']*(?:paper|manuscript)[^/\s\"']*",
    re.IGNORECASE,
)


def read_card(path: Path) -> dict:
    text = path.read_text(encoding="utf-8")
    if not text.startswith("---\n"):
        raise ValueError("README.md does not start with YAML frontmatter")
    return yaml.safe_load(text.split("---", 2)[1]) or {}


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("root", nargs="?", default=".", type=Path)
    args = parser.parse_args()
    root = args.root.resolve()
    errors: list[str] = []

    card = read_card(root / "README.md")
    configs = card.get("configs") or []
    if card.get("license") != LICENSE_ID:
        errors.append(f"Dataset Card license must be {LICENSE_ID}")
    if len(configs) != 14:
        errors.append(f"Dataset Card must declare 14 configurations, found {len(configs)}")
    defaults = [item for item in configs if item.get("default") is True]
    if [item.get("config_name") for item in defaults] != [
        "observed_protocol_action_counts"
    ]:
        errors.append("Dataset Card must declare exactly the governed default configuration")
    for item in configs:
        specs = item.get("data_files") or []
        if len(specs) != 1 or not (root / str(specs[0].get("path"))).is_file():
            errors.append(f"unresolvable data_files entry for {item.get('config_name')}")

    croissant = json.loads((root / "metadata/croissant.json").read_text(encoding="utf-8"))
    if croissant.get("conformsTo") != CORE_VERSION:
        errors.append("Croissant candidate must conform to Croissant 1.1")
    if croissant.get("license") != LICENSE_URL:
        errors.append("Croissant candidate must use the recognized CC BY 4.0 URL")
    missing_rai = sorted(
        field
        for field in RAI_FIELDS
        if field not in croissant or croissant[field] in (None, "", [], {})
    )
    if missing_rai:
        errors.append(f"missing or empty RAI/PROV fields: {missing_rai}")
    if not isinstance(croissant.get("rai:hasSyntheticData"), bool):
        errors.append("rai:hasSyntheticData must be a JSON boolean")
    for field in RAI_FIELDS - {
        "rai:hasSyntheticData",
        "prov:wasDerivedFrom",
        "prov:wasGeneratedBy",
    }:
        if len(str(croissant.get(field, "")).strip()) < 80:
            errors.append(f"{field} is not substantive")
    if len(croissant.get("distribution") or []) != 14:
        errors.append("Croissant must describe 14 distributions")
    if len(croissant.get("recordSet") or []) != 14:
        errors.append("Croissant must describe 14 RecordSets")

    cff = yaml.safe_load((root / "CITATION.cff").read_text(encoding="utf-8")) or {}
    if cff.get("license") != LICENSE_SPDX:
        errors.append(f"CITATION.cff license must be {LICENSE_SPDX}")
    handoff = json.loads(
        (root / "metadata/huggingface_handoff.json").read_text(encoding="utf-8")
    )
    if handoff.get("status") != "READY_FOR_HF_STAGING":
        errors.append("handoff status must be READY_FOR_HF_STAGING")
    if handoff.get("target", {}).get("publication_status") != "NOT_YET_UPLOADED":
        errors.append("handoff must not claim publication before the Hub upload")
    if len(handoff.get("post_upload_gates") or []) < 7:
        errors.append("post-upload validation gates are incomplete")
    if handoff.get("local_clean_load", {}).get("status") != "PASS":
        errors.append("local Hugging Face clean-load receipt is not a pass")
    clean_load = json.loads(
        (root / "metadata/clean_load_audit.json").read_text(encoding="utf-8")
    )
    if clean_load.get("hf_datasets_clean_load") != "PASS":
        errors.append("all configurations must pass datasets.load_dataset")
    if len(clean_load.get("configurations") or []) != 14:
        errors.append("clean-load receipt must cover 14 configurations")
    croissant_receipt = json.loads(
        (root / "metadata/croissant_validation.json").read_text(encoding="utf-8")
    )
    if croissant_receipt.get("status") != "PASS_LOCAL_CANDIDATE":
        errors.append("local Croissant candidate validation is not a pass")

    text_suffixes = {".md", ".json", ".csv", ".yml", ".yaml", ".txt", ".cff"}
    for path in root.rglob("*"):
        if not path.is_file() or path.suffix.lower() not in text_suffixes:
            continue
        if "__pycache__" in path.parts or path.name == "checksums.sha256":
            continue
        content = path.read_text(encoding="utf-8", errors="ignore")
        match = NONPUBLIC_REPOSITORY_URL.search(content)
        if match:
            errors.append(
                f"forbidden non-public repository URL in "
                f"{path.relative_to(root)}: {match.group(0)}"
            )

    status = "PASS" if not errors else "FAIL"
    print(
        json.dumps(
            {
                "status": status,
                "handoff": "READY_FOR_HF_STAGING" if not errors else "BLOCKED",
                "configuration_count": len(configs),
                "rai_field_count": len(RAI_FIELDS) - len(missing_rai),
                "license": LICENSE_SPDX,
                "errors": errors,
                "post_upload_validation_required": True,
            },
            indent=2,
            sort_keys=True,
        )
    )
    return 1 if errors else 0


if __name__ == "__main__":
    raise SystemExit(main())