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"""Validate the Test-only archive and records. This is not an answer scorer."""
from __future__ import annotations

import argparse
import hashlib
import json
from collections import Counter
from pathlib import Path, PurePosixPath
import zipfile

TASKS = {"assembly_decision": 238, "atomic_action": 662, "minimal_rework": 100}
FAMILIES = {"gearbox_structure", "luban_12_pillars", "parametric_box_lock_01",
            "parametric_tower_lock_10", "spherical_interlocking_structure",
            "triangle_dovetail_structure"}
META = {"schema_version", "task_family", "split", "assembly_id", "variant_id",
        "episode_id", "problem_id", "experiment_group_id", "source_sample_id",
        "label_contract", "task_contract_version"}


def file_hash(path):
    with Path(path).open("rb") as f:
        return hashlib.file_digest(f, "sha256").hexdigest()


def safe_image_path(value):
    p = PurePosixPath(value)
    return (not p.is_absolute() and len(p.parts) > 1 and p.parts[0] == "images"
            and ".." not in p.parts and "\\" not in value and ":" not in value
            and p.suffix == ".png" and p.as_posix() == value)


def verify(root):
    root = Path(root).resolve()
    rows = [json.loads(l) for l in (root / "test.jsonl").read_text(encoding="utf-8").splitlines() if l.strip()]
    errors = []
    if len(rows) != 1000:
        errors.append("Expected 1000 Test records")
    if len({r["id"] for r in rows}) != len(rows):
        errors.append("Duplicate sample IDs")
    counts = Counter(r["metadata"]["task_family"] for r in rows)
    if counts != Counter(TASKS):
        errors.append("Task counts do not match the Test split")
    if {r["metadata"]["assembly_id"] for r in rows} != FAMILIES:
        errors.append("Unexpected assembly families")
    for row in rows:
        if set(row) != {"id", "messages", "images", "metadata"}:
            errors.append(f"Unexpected top-level fields: {row['id']}")
        if set(row["metadata"]) != META or row["metadata"]["split"] != "test":
            errors.append(f"Non-public metadata or non-Test row: {row['id']}")
        if not row["messages"] or any(set(m) != {"role", "content"} or m["role"] != "user" or not isinstance(m["content"], str) for m in row["messages"]):
            errors.append(f"Non-user message or invalid prompt: {row['id']}")
        if not row["images"] or any(not safe_image_path(p) for p in row["images"]):
            errors.append(f"Invalid image references: {row['id']}")
    refs = {p for r in rows for p in r["images"]}
    if len(refs) != 1140:
        errors.append("Expected 1140 unique Test images")
    index = json.loads((root / "image_manifest.json").read_text(encoding="utf-8"))
    entries = index["images"]
    if len(entries) != len({e['path'] for e in entries}) or {e['path'] for e in entries} != refs:
        errors.append("Image index does not exactly match Test references")
    expected = {e["path"]: e for e in entries}
    with zipfile.ZipFile(root / "images.zip") as archive:
        names = archive.namelist()
        if len(names) != len(set(names)) or set(names) != refs:
            errors.append("Archive contains duplicate, missing or extra files")
        for info in archive.infolist():
            if not safe_image_path(info.filename) or info.filename not in expected:
                errors.append(f"Unexpected archive entry: {info.filename}")
                continue
            content = archive.read(info)
            entry = expected[info.filename]
            if not content.startswith(b"\x89PNG\r\n\x1a\n"):
                errors.append(f"Not a PNG: {info.filename}")
            if len(content) != entry['bytes'] or hashlib.sha256(content).hexdigest() != entry['sha256']:
                errors.append(f"Image hash mismatch: {info.filename}")
    declared = {}
    for line in (root / "MANIFEST.sha256").read_text(encoding="utf-8").splitlines():
        digest, name = line.split("  ", 1)
        if Path(name).name != name or "/" in name or "\\" in name or name in declared:
            errors.append(f"Invalid/duplicate manifest entry: {name}")
            continue
        declared[name] = digest
        if not (root / name).is_file() or file_hash(root / name) != digest:
            errors.append(f"Release hash mismatch: {name}")
    actual = {p.name for p in root.iterdir() if p.is_file() and p.name != "MANIFEST.sha256"}
    if actual != set(declared):
        errors.append("Release files differ from the checksum manifest")
    for path in root.iterdir():
        if path.is_dir() and path.name not in {".git", ".cache", "__pycache__", "images"}:
            errors.append(f"Unexpected directory in upload root: {path.name}")
    # If users manually extracted images, they must still be Test-only and intact.
    if (root / 'images').exists():
        extracted = {p.relative_to(root).as_posix(): p for p in (root/'images').rglob('*') if p.is_file()}
        if set(extracted) != refs:
            errors.append("Extracted images contain missing or extra files")
        else:
            for name, path in extracted.items():
                if file_hash(path) != expected[name]['sha256']:
                    errors.append(f"Extracted image hash mismatch: {name}")
    release = json.loads((root/'release_manifest.json').read_text(encoding='utf-8'))
    if release['counts']['test_rows'] != len(rows) or release['counts']['unique_images'] != len(refs):
        errors.append("Release manifest counts mismatch")
    if release['test_jsonl_sha256'] != file_hash(root/'test.jsonl'):
        errors.append("Release manifest JSONL hash mismatch")
    return {"test_rows": len(rows), "task_counts": dict(counts), "families": len(FAMILIES),
            "unique_images": len(refs), "assistant_messages": sum(m['role']=='assistant' for r in rows for m in r['messages']),
            "metadata_allowlist_checked": True, "errors": errors}


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--root", type=Path, default=Path(__file__).resolve().parent)
    try:
        result = verify(parser.parse_args().root)
    except Exception as exc:
        result = {"errors": [f"{type(exc).__name__}: {exc}"]}
    print(json.dumps(result, ensure_ascii=False, indent=2))
    raise SystemExit(bool(result["errors"]))