#!/usr/bin/env python3
"""Merge audit JSONL manifests into one unique source-ordered file."""

from __future__ import annotations

import argparse
import json
import os
from pathlib import Path


def main() -> None:
    """Merge the last result for each sample and write it in source order."""

    parser = argparse.ArgumentParser()
    parser.add_argument("source", type=Path, help="Source sample JSONL defining output order")
    parser.add_argument("output", type=Path)
    parser.add_argument("manifests", type=Path, nargs="+")
    parser.add_argument("--require-count", type=int)
    args = parser.parse_args()

    audits: dict[str, dict] = {}
    for path in args.manifests:
        if not path.exists():
            continue
        with path.open(encoding="utf-8") as handle:
            for line in handle:
                if not line.strip():
                    continue
                value = json.loads(line)
                sample_id = value.get("sample_id")
                if not isinstance(sample_id, str) or not sample_id:
                    raise ValueError(f"Audit in {path} has no sample_id")
                audits[sample_id] = value

    ordered: list[dict] = []
    with args.source.open(encoding="utf-8") as handle:
        for line in handle:
            if not line.strip():
                continue
            source_record = json.loads(line)
            sample_id = source_record.get("trajectory_id") or source_record.get("sample_id")
            if sample_id in audits:
                ordered.append(audits.pop(sample_id))

    if audits:
        raise ValueError(f"Found {len(audits)} audit IDs absent from the source sample")
    if args.require_count is not None and len(ordered) != args.require_count:
        raise ValueError(f"Expected {args.require_count} merged records, found {len(ordered)}")

    args.output.parent.mkdir(parents=True, exist_ok=True)
    temporary = args.output.with_suffix(args.output.suffix + ".tmp")
    with temporary.open("w", encoding="utf-8") as handle:
        for value in ordered:
            handle.write(json.dumps(value, ensure_ascii=False, default=str) + "\n")
    os.replace(temporary, args.output)
    print(json.dumps({"output": str(args.output), "records": len(ordered)}, indent=2))


if __name__ == "__main__":
    main()