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#!/usr/bin/env python3
"""Build deterministic, lossless JSONL views of the packaged research sources.

Python 3.9+, standard library only. This is a document conversion utility,
not an implementation or verification of the proposed RSI architecture.
"""

import argparse
import hashlib
import json
from pathlib import Path
import re
import sys


FIELDS = (
    "id", "title", "content", "content_format", "source_path",
    "source_locator", "record_type", "evidence_status", "source_sha256",
)
MANUSCRIPT = "manuscript/Iyeumiru_R_Rayo_RSI.tex"
CLAIMS = "metadata/claims.json"


def sha256(data):
    return hashlib.sha256(data).hexdigest()


def json_line(record):
    if tuple(record) != FIELDS or not all(isinstance(value, str) for value in record.values()):
        raise ValueError("Every record must have the common, string-valued schema")
    return json.dumps(record, ensure_ascii=False, separators=(",", ":")) + "\n"


def build_manuscript(raw):
    text = raw.decode("utf-8")
    boundaries = [(0, "Preamble and title matter")]
    appendix_pos = text.index("\\appendix\n")
    for match in re.finditer(r"^\\section\*?\{([^\n]+)\}\s*$", text, re.MULTILINE):
        pos = match.start()
        # Keep the appendix switch with the first appendix, not the last main section.
        if text[appendix_pos:pos].strip() == "\\appendix":
            pos = appendix_pos
        boundaries.append((pos, match.group(1)))
    bibliography_pos = text.index("\\begin{thebibliography}")
    boundaries.append((bibliography_pos, "References and document closing"))
    boundaries.sort()
    if len({pos for pos, _ in boundaries}) != len(boundaries):
        raise ValueError("Duplicate source boundaries")

    records = []
    for index, (start, title) in enumerate(boundaries):
        end = boundaries[index + 1][0] if index + 1 < len(boundaries) else len(text)
        content = text[start:end]
        if not content:
            raise ValueError("Empty manuscript source chunk")
        line_start = text[:start].count("\n") + 1
        line_end = line_start + content.count("\n") - int(content.endswith("\n"))
        locator = {
            "line_start": line_start,
            "line_end_inclusive": line_end,
            "utf8_byte_start": len(text[:start].encode("utf-8")),
            "utf8_byte_end_exclusive": len(text[:end].encode("utf-8")),
        }
        records.append({
            "id": "manuscript-{:03d}".format(index),
            "title": title,
            "content": content,
            "content_format": "latex",
            "source_path": MANUSCRIPT,
            "source_locator": json.dumps(locator, separators=(",", ":")),
            "record_type": "manuscript_source_chunk",
            "evidence_status": "theoretical_manuscript_not_independently_verified",
            "source_sha256": sha256(raw),
        })

    reconstructed = "".join(record["content"] for record in records).encode("utf-8")
    if reconstructed != raw:
        raise ValueError("Manuscript chunks do not reconstruct the authoritative source")
    for record in records:
        loc = json.loads(record["source_locator"])
        fragment = raw[loc["utf8_byte_start"]:loc["utf8_byte_end_exclusive"]]
        if fragment.decode("utf-8") != record["content"]:
            raise ValueError("Source byte locator mismatch")
    return records


def build_claims(raw):
    registry = json.loads(raw.decode("utf-8"))
    if not isinstance(registry.get("claims"), list):
        raise ValueError("Expected a claims array in the authoritative registry")
    records = []
    for index, claim in enumerate(registry["claims"]):
        records.append({
            "id": "claim-" + claim["id"],
            "title": claim["claim"],
            "content": json.dumps(claim, ensure_ascii=False, sort_keys=True, indent=2),
            "content_format": "json",
            "source_path": CLAIMS,
            "source_locator": "/claims/{}".format(index),
            "record_type": "claim_register_entry",
            "evidence_status": claim["status"],
            "source_sha256": sha256(raw),
        })
        if json.loads(records[-1]["content"]) != claim:
            raise ValueError("Claim payload changed during normalization")
    return records


def build(root, check=False):
    manuscript_raw = (root / MANUSCRIPT).read_bytes()
    claims_raw = (root / CLAIMS).read_bytes()
    outputs = {
        "data/manuscript_sections.jsonl": build_manuscript(manuscript_raw),
        "data/claims.jsonl": build_claims(claims_raw),
    }
    identifiers = [row["id"] for records in outputs.values() for row in records]
    if len(set(identifiers)) != len(identifiers):
        raise ValueError("Duplicate record identifiers")

    for relative, records in outputs.items():
        expected = "".join(json_line(record) for record in records).encode("utf-8")
        target = root / relative
        if check:
            if not target.is_file() or target.read_bytes() != expected:
                raise ValueError("JSONL view is missing or out of date: " + relative)
        else:
            target.parent.mkdir(parents=True, exist_ok=True)
            target.write_bytes(expected)
        print("{}: {} records; sha256 {}".format(relative, len(records), sha256(expected)))
    print("PASS: unique IDs; common string schema; exact source byte reconstruction; exact claim payloads")
    return 0


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--root", type=Path, default=Path(__file__).resolve().parents[1],
                        help="Dataset repository directory (default: parent of tools/)")
    parser.add_argument("--check", action="store_true", help="Compare with existing JSONL files without writing")
    args = parser.parse_args()
    try:
        return build(args.root.resolve(), args.check)
    except (OSError, ValueError, KeyError, TypeError) as error:
        print("Corpus validation failed: {}".format(error), file=sys.stderr)
        return 1


if __name__ == "__main__":
    sys.exit(main())