"""Validate sf_release before publishing to Hugging Face.

Checks:
  - manifest.jsonl and metadata.json exist and are consistent
  - every required artifact path in the manifest exists on disk
  - optional artifacts are reported but do not fail validation when absent
  - config.json files contain no machine-local absolute paths
  - .gitattributes routes *.pkl through Git LFS

Usage:
    python scripts/validate_release.py
    python scripts/validate_release.py --root /path/to/sf_release --strict
"""

from __future__ import annotations

import argparse
import json
import re
from pathlib import Path
from typing import Any

LOCAL_PATH_RE = re.compile(
    r"(/users/|/oscar/|/scratch/|/home/|[A-Za-z]:\\\\)"
)

REQUIRED_ROW_FLAGS = ("has_config",)
REQUIRED_PATH_KEYS = ("config_path",)
# Instances must carry EITHER a primitive_assembly OR a primitive_assembly_error
# pickle. Failed fits are released for completeness.
ASSEMBLY_OR_ERROR_KEYS = ("primitive_assembly_path", "primitive_assembly_error_path")
OPTIONAL_PATH_KEYS = (
    "primitive_assembly_path",
    "primitive_assembly_eval_path",
    "primitive_assembly_error_path",
    "primitive_assembly_textured_path",
)


def load_manifest(root: Path) -> list[dict[str, Any]]:
    manifest_path = root / "manifest.jsonl"
    if not manifest_path.is_file():
        raise FileNotFoundError(f"Missing {manifest_path}")
    rows: list[dict[str, Any]] = []
    with manifest_path.open() as fh:
        for i, line in enumerate(fh, 1):
            line = line.strip()
            if not line:
                continue
            try:
                rows.append(json.loads(line))
            except json.JSONDecodeError as exc:
                raise ValueError(f"manifest.jsonl line {i}: {exc}") from exc
    return rows


def validate_manifest_paths(root: Path, rows: list[dict[str, Any]]) -> tuple[list[str], list[str]]:
    errors: list[str] = []
    warnings: list[str] = []

    for row in rows:
        inst = row.get("instance_dir", "?")
        for flag in REQUIRED_ROW_FLAGS:
            if not row.get(flag):
                errors.append(f"{inst}: missing required flag {flag}")
        for key in REQUIRED_PATH_KEYS:
            rel = row.get(key)
            if not rel:
                errors.append(f"{inst}: missing {key}")
                continue
            if not (root / rel).is_file():
                errors.append(f"{inst}: file not found: {rel}")

        if not any(row.get(k) for k in ASSEMBLY_OR_ERROR_KEYS):
            errors.append(
                f"{inst}: missing both primitive_assembly_path and primitive_assembly_error_path"
            )

        for key in OPTIONAL_PATH_KEYS:
            rel = row.get(key)
            flag = key.replace("_path", "")
            has_flag = row.get(f"has_{flag}", row.get(key.replace("_path", "").replace("primitive_assembly_", "has_primitive_assembly_")))
            # normalize flag name from path key
            if key == "primitive_assembly_eval_path":
                has_flag = row.get("has_primitive_assembly_eval")
            elif key == "primitive_assembly_error_path":
                has_flag = row.get("has_primitive_assembly_error")
            elif key == "primitive_assembly_textured_path":
                has_flag = row.get("has_primitive_assembly_textured")

            if has_flag and rel and not (root / rel).is_file():
                errors.append(f"{inst}: flagged present but missing: {rel}")
            if not has_flag and rel:
                warnings.append(f"{inst}: {key} set but has_* flag is false")

    return errors, warnings


def validate_metadata(root: Path, rows: list[dict[str, Any]]) -> list[str]:
    errors: list[str] = []
    meta_path = root / "metadata.json"
    if not meta_path.is_file():
        return [f"Missing {meta_path}"]
    with meta_path.open() as fh:
        meta = json.load(fh)
    if meta.get("total_instances") != len(rows):
        errors.append(
            f"metadata total_instances={meta.get('total_instances')} "
            f"!= manifest rows={len(rows)}"
        )
    return errors


def validate_configs(root: Path) -> list[str]:
    errors: list[str] = []
    for cfg in root.rglob("config.json"):
        try:
            data = json.loads(cfg.read_text())
        except json.JSONDecodeError as exc:
            errors.append(f"{cfg}: invalid JSON: {exc}")
            continue
        if not isinstance(data, dict):
            continue
        for key, value in data.items():
            if isinstance(value, str) and LOCAL_PATH_RE.search(value):
                errors.append(f"{cfg}: local path in {key}: {value[:80]}")
    return errors


def validate_gitattributes(root: Path) -> list[str]:
    errors: list[str] = []
    ga = root / ".gitattributes"
    if not ga.is_file():
        return ["Missing .gitattributes"]
    text = ga.read_text()
    if "*.pkl" not in text or "filter=lfs" not in text:
        errors.append(".gitattributes does not route *.pkl through Git LFS")
    return errors


def validate_readme(root: Path) -> list[str]:
    errors: list[str] = []
    readme = root / "README.md"
    if not readme.is_file():
        return ["Missing README.md"]
    head = readme.read_text()[:800]
    if not head.startswith("---"):
        errors.append("README.md missing YAML front matter (---)")
    for token in ("license:", "task_categories:", "tags:"):
        if token not in head:
            errors.append(f"README.md front matter missing `{token}`")
    if "pickle" not in readme.read_text().lower():
        errors.append("README.md should document pickle safety")
    return errors


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    default_root = Path(__file__).resolve().parent.parent
    parser.add_argument("--root", type=Path, default=default_root)
    parser.add_argument(
        "--strict",
        action="store_true",
        help="Treat warnings as errors.",
    )
    parser.add_argument(
        "--skip-config-scan",
        action="store_true",
        help="Skip scanning all config.json files (faster).",
    )
    args = parser.parse_args()
    root = args.root.resolve()

    print(f"Validating release at {root}")
    all_errors: list[str] = []
    all_warnings: list[str] = []

    try:
        rows = load_manifest(root)
        print(f"  manifest rows: {len(rows)}")
    except (FileNotFoundError, ValueError) as exc:
        print(f"FAIL: {exc}")
        raise SystemExit(1) from exc

    all_errors.extend(validate_metadata(root, rows))
    path_errors, path_warnings = validate_manifest_paths(root, rows)
    all_errors.extend(path_errors)
    all_warnings.extend(path_warnings)

    if not args.skip_config_scan:
        print("  scanning config.json files for local paths...")
        all_errors.extend(validate_configs(root))

    all_errors.extend(validate_gitattributes(root))
    all_errors.extend(validate_readme(root))

    for w in all_warnings:
        print(f"WARN: {w}")
    for e in all_errors:
        print(f"ERROR: {e}")

    if all_warnings and args.strict:
        all_errors.extend([f"(strict) {w}" for w in all_warnings])

    if all_errors:
        print(f"\nValidation FAILED ({len(all_errors)} error(s))")
        report = root / "release_report.txt"
        try:
            report.write_text("\n".join(["ERRORS:"] + all_errors + ["", "WARNINGS:"] + all_warnings))
            print(f"Wrote {report}")
        except OSError:
            pass
        raise SystemExit(1)

    print("\nValidation PASSED")
    if all_warnings:
        print(f"  ({len(all_warnings)} warning(s); re-run with --strict to fail on warnings)")


if __name__ == "__main__":
    main()