#!/usr/bin/env python3
"""Sanitize JSON/JSONL artifacts before staging a review package."""

from __future__ import annotations

import argparse
import hashlib
import json
import shutil
from pathlib import Path
from typing import Any


TEXT_SUFFIXES = {".json", ".jsonl"}


def _load_policy(path: Path) -> dict[str, list[str]]:
    policy: dict[str, list[str]] = {"drop_keys": [], "hash_keys": [], "keep_keys": []}
    current: str | None = None
    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#"):
            continue
        if line.endswith(":"):
            current = line[:-1]
            policy.setdefault(current, [])
            continue
        if line.startswith("- ") and current:
            policy[current].append(line[2:].strip())
    return policy


def _hash_value(value: Any) -> str:
    payload = json.dumps(value, sort_keys=True, ensure_ascii=True)
    return hashlib.sha256(payload.encode("utf-8")).hexdigest()


def _drop_path(record: dict[str, Any], dotted_key: str) -> None:
    parts = dotted_key.split(".")
    cursor: Any = record
    for part in parts[:-1]:
        if not isinstance(cursor, dict) or part not in cursor:
            return
        cursor = cursor[part]
    if isinstance(cursor, dict):
        cursor.pop(parts[-1], None)


def _sanitize_obj(obj: Any, policy: dict[str, list[str]]) -> Any:
    if isinstance(obj, list):
        return [_sanitize_obj(item, policy) for item in obj]
    if not isinstance(obj, dict):
        return obj

    sanitized = {key: _sanitize_obj(value, policy) for key, value in obj.items()}
    for dotted_key in policy["drop_keys"]:
        _drop_path(sanitized, dotted_key)
    for key in policy["hash_keys"]:
        if key in sanitized:
            sanitized[key] = _hash_value(sanitized[key])
    return sanitized


def _sanitize_json(src: Path, dst: Path, policy: dict[str, list[str]]) -> None:
    obj = json.loads(src.read_text(encoding="utf-8"))
    dst.write_text(json.dumps(_sanitize_obj(obj, policy), indent=2, sort_keys=True) + "\n", encoding="utf-8")


def _sanitize_jsonl(src: Path, dst: Path, policy: dict[str, list[str]]) -> None:
    lines: list[str] = []
    for line in src.read_text(encoding="utf-8").splitlines():
        if not line.strip():
            continue
        lines.append(json.dumps(_sanitize_obj(json.loads(line), policy), sort_keys=True))
    dst.write_text("\n".join(lines) + ("\n" if lines else ""), encoding="utf-8")


def sanitize_tree(input_root: Path, output_root: Path, policy: dict[str, list[str]]) -> dict[str, int]:
    counts = {"copied": 0, "sanitized": 0}
    for src in input_root.rglob("*"):
        if src.is_dir():
            continue
        rel = src.relative_to(input_root)
        if any(part in {"__pycache__", ".pytest_cache"} for part in rel.parts):
            continue
        if src.suffix in {".pyc", ".lnk"}:
            continue
        dst = output_root / rel
        dst.parent.mkdir(parents=True, exist_ok=True)
        if src.suffix == ".json":
            _sanitize_json(src, dst, policy)
            counts["sanitized"] += 1
        elif src.suffix == ".jsonl":
            _sanitize_jsonl(src, dst, policy)
            counts["sanitized"] += 1
        else:
            shutil.copy2(src, dst)
            counts["copied"] += 1
    return counts


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--input", required=True, help="Input artifact tree")
    parser.add_argument("--output", required=True, help="Sanitized output tree")
    parser.add_argument("--policy", required=True, help="YAML policy with drop_keys/hash_keys/keep_keys lists")
    return parser.parse_args()


def main() -> int:
    args = parse_args()
    input_root = Path(args.input)
    output_root = Path(args.output)
    policy = _load_policy(Path(args.policy))
    counts = sanitize_tree(input_root, output_root, policy)
    print(json.dumps({"status": "PASS", "input": str(input_root), "output": str(output_root), **counts}, indent=2))
    return 0


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