"""Verify or seal the distributable dataset without contacting any service."""
from __future__ import annotations
import argparse
import hashlib
import json
from pathlib import Path
import re
import sys

sys.dont_write_bytecode = True
ROOT = Path(__file__).resolve().parent
TOP_FILES = {"README.md", "LICENSE", "CURATION.md", "DATA_DICTIONARY.md", "UPLOAD.md",
             "CITATION.cff", "build_dataset.py", "write_card.py", "verify.py", "upload.py",
             "test_release.py", "verification.json", ".gitignore"}
PUBLIC_DIRS = {"data", "assets", "schemas", "provenance", "examples"}
SECRET = re.compile(r"\b(?:github_pat_[A-Za-z0-9_]{30,}|gh[pousr]_[A-Za-z0-9]{30,}|hf_[A-Za-z0-9]{25,}|sk-(?:ant-|proj-)?[A-Za-z0-9_-]{24,})\b|-----BEGIN (?:RSA |EC |OPENSSH )?PRIVATE KEY-----")
PRIVATE = re.compile(r"/home/[A-Za-z0-9_.-]+/|https?://[^\s\"<>]*\.ts\.net\b")


def digest(raw):
    return hashlib.sha256(raw).hexdigest()


def canonical(value):
    return json.dumps(value, sort_keys=True, separators=(",", ":"), ensure_ascii=False, allow_nan=False).encode()


def read_rows(path):
    with path.open(encoding="utf-8") as stream:
        return [json.loads(line) for line in stream if line.strip()]


def pointer(value, path):
    if path in ("", "$"):
        return value
    parts = path[1:].split("/") if path.startswith("/") else path.removeprefix("$.").split(".")
    for part in parts:
        if isinstance(value, str):
            value = json.loads(value)
        part = part.replace("~1", "/").replace("~0", "~")
        value = value[int(part)] if isinstance(value, list) else value[part]
    return value


def references(value):
    if isinstance(value, dict):
        if isinstance(value.get("request_id"), str) and isinstance(value.get("path"), str):
            yield value
        for child in value.values():
            yield from references(child)
    elif isinstance(value, list):
        for child in value:
            yield from references(child)


def verify_evidence(row):
    public = json.loads(row["public_row_json"])
    assert digest(canonical({k:v for k,v in public.items() if k != "sha256"})) == row["row_sha256"] == public["sha256"], "Public tool-row hash mismatch"
    assert public["args"] == json.loads(row["args_json"]), "Arguments differ"
    assert public["response"] == json.loads(row["response_json"]), "Response differs"
    for key, other in [("request_id","request_id"),("tool","tool"),("status","status"),("line","source_line"),("ts","timestamp"),("duration_ms","duration_ms")]:
        assert public[key] == row[other], "Evidence projection differs: " + key
    assert re.fullmatch("[0-9a-f]{64}", row["source_row_sha256"]), "Invalid source row hash"
    request = public.get("request", {})
    assert not any(k in request or k in request.get("params", {}) for k in ("_meta", "meta", "metadata")), "Client metadata was retained"
    assert not SECRET.search(row["public_row_json"]) and not PRIVATE.search(row["public_row_json"]), "Private evidence content"
    return public


def manifest_files(root):
    files = []
    for path in sorted(root.rglob("*")):
        relative = path.relative_to(root)
        if not path.is_file() or path.is_symlink():
            continue
        if (len(relative.parts) == 1 and relative.name in TOP_FILES) or relative.parts[0] in PUBLIC_DIRS:
            if "__pycache__" not in relative.parts and path.suffix != ".pyc":
                files.append(path)
    return files


def seal(root=ROOT):
    root = Path(root).resolve()
    assert root == ROOT or root.is_relative_to(ROOT), "Seal output must remain inside huggingface/"
    manifest = json.loads((root / "manifest.json").read_text())
    manifest["files"] = {str(p.relative_to(root)): {"sha256":digest(p.read_bytes()), "bytes":p.stat().st_size} for p in manifest_files(root)}
    (root / "manifest.json").write_text(json.dumps(manifest, ensure_ascii=True, allow_nan=False, indent=2) + "\n")
    names = [*manifest["files"], "manifest.json"]
    (root / "SHA256SUMS").write_text("".join(digest((root/name).read_bytes()) + "  " + name + "\n" for name in sorted(names)))
    return manifest


def verify(root=ROOT):
    from jsonschema import Draft202012Validator
    root = Path(root).resolve()
    manifest = json.loads((root / "manifest.json").read_text())
    assert manifest["license"] == "mit" and manifest["created_by"] == "ChemBricks"
    for name, item in manifest["files"].items():
        path = (root / name).resolve()
        assert path.is_relative_to(root) and not (root / name).is_symlink()
        assert digest(path.read_bytes()) == item["sha256"] and path.stat().st_size == item["bytes"], "File differs: " + name
    sums = {}
    for line in (root / "SHA256SUMS").read_text().splitlines():
        expected, name = line.split("  ", 1)
        assert name in manifest["files"] or name == "manifest.json", "Unexpected checksum path"
        assert name not in sums, "Duplicate checksum path"
        assert digest((root/name).read_bytes()) == expected, "Checksum differs: " + name
        sums[name] = expected
    assert set(sums) == set(manifest["files"]) | {"manifest.json"}
    data = {}
    for name in ("records", "claims", "evidence"):
        schema = json.loads((root / "schemas" / (name + ".schema.json")).read_text())
        validator = Draft202012Validator(schema)
        data[name] = read_rows(root / "data" / (name + ".jsonl"))
        for row in data[name]:
            validator.validate(row)
            serialized = json.dumps(row)
            assert not SECRET.search(serialized) and not PRIVATE.search(serialized), "Private material in " + name
        expected = manifest["evidence_rows" if name == "evidence" else name]
        assert len(data[name]) == expected, "Count differs: " + name
    by_call = {}
    for row in data["evidence"]:
        key = row["source_capture_id"], row["request_id"]
        assert key not in by_call, "Duplicate evidence join key"
        by_call[key] = verify_evidence(row)
    provenance = {row["record_id"]: row for row in read_rows(root / "provenance/records.jsonl")}
    ledger_raw = (root / "provenance/source-ledger.jsonl").read_bytes()
    assert digest(ledger_raw) == manifest["source_ledger_sha256"]
    chain = read_rows(root / "provenance/source-ledger.jsonl")
    previous, ledger = "0" * 64, {}
    for i, row in enumerate(chain, 1):
        assert row["prev"] == previous and row["record_id"] not in ledger
        assert digest((row["record_sha256"] + row["tools_sha256"] + row["trace_sha256"] + previous).encode()) == row["entry"]
        previous = row["entry"]
        ledger[row["record_id"]] = (i,row)
    assert previous == manifest["source_ledger_head"] and len(chain) == manifest["source_ledger_entries"]
    for rid, source in provenance.items():
        assert (source["ledger_line"],source["ledger"]) == ledger[rid]
        assert source["release_license"] == "mit"
    claim_index = {}
    for row in data["claims"]:
        key = row["record_id"], row["claim_id"]
        assert key not in claim_index and row["id"] == ":".join(key)
        claim = json.loads(row["claim_json"])
        confidence = json.loads(row["source_confidence_json"])
        assert claim["verdict"] == row["verdict"] == "passed"
        assert confidence["context_eligible"] and not confidence["issues"] and confidence["prediction_timing"] != "fail"
        assert all(s["verdict"] == "passed" and not s["quarantined"] for s in confidence["sources"])
        assert row["statement"] == claim["statement"] and row["value_json"] == json.dumps(claim.get("value"),sort_keys=True,separators=(",",":"))
        assert row["license"] == "mit" and row["creator"] == "ChemBricks"
        assert row["source_capture_id"] == provenance[row["record_id"]]["ledger"]["tools_sha256"]
        for ref in references([claim, confidence]):
            source = by_call[(row["source_capture_id"], ref["request_id"])]
            pointer(source["response"], ref["path"])
        claim_index[key] = row
    seen = set()
    for row in data["records"]:
        rid = row["record_id"]
        assert rid not in seen
        seen.add(rid)
        source = provenance[rid]
        assert source["full_record_eligible"] and source["ledger"]["record_sha256"] == row["source_record_sha256"]
        assert digest(row["trace_markdown"].encode()) == source["ledger"]["trace_sha256"] == row["source_trace_sha256"]
        assert row["source_capture_id"] == source["ledger"]["tools_sha256"]
        assert row["license"] == "mit" and row["creator"] == "ChemBricks"
        claims = json.loads(row["claims_json"])
        assert len(claims) == row["claims_count"]
        assert json.loads(row["validation_gates_json"])["G6"] == "pass"
        for claim in claims:
            exported = claim_index[(rid,claim["id"])]
            assert exported["full_record_eligible"] and json.loads(exported["claim_json"]) == claim
        confidence = json.loads(row["source_confidence_json"])
        assert all(item["context_eligible"] for item in confidence.values())
    assert all(row["full_record_eligible"] == (row["record_id"] in seen) for row in data["claims"])
    card = (root / "README.md").read_text()
    metadata = json.loads(card.split("---",2)[1])
    assert metadata["license"] == "mit" and metadata["language"] == ["en"]
    assert {c["config_name"] for c in metadata["configs"]} == set(data)
    for config in metadata["configs"]:
        assert config["data_files"] == [{"split":"corpus","path":"data/" + config["config_name"] + ".jsonl"}]
    assert "assets/knowledge-path.svg" in card and "https://chembricks.ai" in card and "https://cmbx.ai" in card
    assert "MIT License" in (root / "LICENSE").read_text()
    print(json.dumps({"status":"pass","records":len(data["records"]),"claims":len(data["claims"]),"evidence_rows":len(data["evidence"]),"files":len(manifest["files"])}))
    return manifest


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--seal", action="store_true")
    args = parser.parse_args()
    if args.seal:
        seal()
    verify()