#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""合并分块 analysis 的 neuron_analysis: 逐 (module,layer) 把各 chunk 的 per-channel 高激活
entry list 拼接 (sentence_idx 按累计偏移修正以支持 ctx), sentence 拼接。结果等价于在全部
样本上一次性 analysis (na-count = 各 chunk 之和, top-K-by-activation 不变)。

用法: merge_chunks.py <out_dir> <chunk_dir0> <chunk_dir1> ...
"""
import json, sys, glob
from pathlib import Path


def _load(p):
    try:
        import orjson
        return orjson.loads(Path(p).read_bytes())
    except Exception:
        return json.loads(Path(p).read_text(encoding="utf-8"))


def main(out_dir, chunk_dirs):
    out_dir = Path(out_dir); out_dir.mkdir(parents=True, exist_ok=True)
    chunk_dirs = [Path(c) for c in chunk_dirs]
    bases = sorted(p.name.replace("_neuron_analysis.json", "")
                   for p in chunk_dirs[0].glob("*_neuron_analysis.json"))
    print(f"merging {len(chunk_dirs)} chunks, {len(bases)} module-layer files", flush=True)
    for bi, base in enumerate(bases):
        merged = {}; merged_sents = []; offset = 0
        for cd in chunk_dirs:
            naf = cd / f"{base}_neuron_analysis.json"
            sf = cd / f"{base}_sentence.json"
            if not naf.exists():
                continue
            ntt = _load(naf).get("neuron_top_tokens", {})
            sents = _load(sf).get("sentences", []) if sf.exists() else []
            for ch, entries in ntt.items():
                if offset:
                    for e in entries:
                        if isinstance(e, dict) and e.get("sentence_idx") is not None:
                            e["sentence_idx"] = e["sentence_idx"] + offset
                merged.setdefault(ch, []).extend(entries)
            merged_sents.extend(sents); offset += len(sents)
        (out_dir / f"{base}_neuron_analysis.json").write_text(
            json.dumps({"neuron_top_tokens": merged}, ensure_ascii=False, separators=(",", ":")),
            encoding="utf-8")
        (out_dir / f"{base}_sentence.json").write_text(
            json.dumps({"sentences": merged_sents}, ensure_ascii=False, separators=(",", ":")),
            encoding="utf-8")
        if (bi + 1) % 20 == 0:
            print(f"  {bi+1}/{len(bases)} done (last {base}: {offset} sents)", flush=True)
    print(f"merged -> {out_dir}", flush=True)


if __name__ == "__main__":
    main(sys.argv[1], sys.argv[2:])