#!/usr/bin/env python3
import gzip, json, os, shutil
import pyarrow as pa
import pyarrow.parquet as pq

ROOT = os.environ.get("UNSC_CORPUS_ROOT", ".")
D = f"{ROOT}/publication/data"
src = f"{D}/fulltext.jsonl"
schema = pa.schema([("record_id", pa.int64()), ("symbol", pa.string()),
                    ("family", pa.string()), ("date", pa.string()),
                    ("n_chars", pa.int64()), ("text", pa.string())])

writer = pq.ParquetWriter(f"{D}/fulltext.parquet", schema, compression="zstd")
batch, N = [], 0
def flush():
    global batch
    if not batch:
        return
    cols = {f.name: [r.get(f.name) for r in batch] for f in schema}
    cols["record_id"] = [int(x) if x is not None else None for x in cols["record_id"]]
    writer.write_table(pa.table(cols, schema=schema))
    batch = []
for line in open(src):
    batch.append(json.loads(line)); N += 1
    if len(batch) >= 2000:
        flush()
flush(); writer.close()
print(f"wrote fulltext.parquet ({N} rows)", flush=True)

with open(src, "rb") as f_in, gzip.open(f"{src}.gz", "wb", compresslevel=6) as f_out:
    shutil.copyfileobj(f_in, f_out, length=1024*1024)
os.remove(src)
print("wrote fulltext.jsonl.gz; removed uncompressed", flush=True)
print("DONE", flush=True)