#!/usr/bin/env python3
"""Audit downloaded PMData daily ZIP archives without extracting them."""

from __future__ import annotations

import argparse
import datetime as dt
import json
import zipfile
from pathlib import Path

import pyarrow.parquet as pq


ROOT = Path(__file__).resolve().parents[1]
DEFAULT_DATA_ROOT = ROOT / "data" / "pmdata"


def iter_dates(start_date: str, end_date: str) -> list[str]:
    start = dt.date.fromisoformat(start_date)
    end = dt.date.fromisoformat(end_date)
    if end < start:
        raise ValueError(f"end date {end} is before start date {start}")
    dates = []
    cur = start
    while cur <= end:
        dates.append(cur.isoformat())
        cur += dt.timedelta(days=1)
    return dates


def parquet_rows_from_zip(zf: zipfile.ZipFile, names: list[str]) -> int:
    total = 0
    for name in names:
        with zf.open(name) as fh:
            total += pq.ParquetFile(fh).metadata.num_rows
    return total


def expected_names(series: str, date: str) -> list[str]:
    day = dt.date.fromisoformat(date)
    start = int(dt.datetime(day.year, day.month, day.day, tzinfo=dt.timezone.utc).timestamp())
    prefix = f"{series.split('-', 1)[0]}-updown-5m" if series.endswith("-5m") else series
    return [f"{prefix}-{start + i * 300}.parquet" for i in range(288)]


def audit_zip(path: Path, *, series: str, date: str) -> dict[str, object]:
    if not path.exists():
        return {"path": str(path), "exists": False}

    with zipfile.ZipFile(path) as zf:
        bad_file = zf.testzip()
        infos = zf.infolist()
        parquet_names = [info.filename for info in infos if info.filename.endswith(".parquet")]
        missing = [name for name in expected_names(series, date) if name not in set(parquet_names)]
        row_count = parquet_rows_from_zip(zf, parquet_names)
        return {
            "path": str(path),
            "exists": True,
            "zip_ok": bad_file is None,
            "bad_file": bad_file,
            "zip_bytes": path.stat().st_size,
            "parquet_files": len(parquet_names),
            "uncompressed_bytes": sum(info.file_size for info in infos),
            "row_count": row_count,
            "first_file": parquet_names[0] if parquet_names else None,
            "last_file": parquet_names[-1] if parquet_names else None,
            "missing_expected_files": missing,
        }


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--data-root", type=Path, default=DEFAULT_DATA_ROOT)
    parser.add_argument("--series", default="btc-5m")
    parser.add_argument("--start-date", required=True)
    parser.add_argument("--end-date", required=True)
    parser.add_argument("--out", type=Path, required=True)
    args = parser.parse_args()

    days = []
    totals = {
        "zip_bytes": 0,
        "uncompressed_bytes": 0,
        "poly_l2_rows": 0,
        "polygon_trades_rows": 0,
        "poly_l2_files": 0,
        "polygon_trades_files": 0,
    }

    for date in iter_dates(args.start_date, args.end_date):
        day_dir = args.data_root / args.series / date
        l2 = audit_zip(day_dir / f"{args.series}_poly_l2_{date}.zip", series=args.series, date=date)
        trades = audit_zip(
            day_dir / f"{args.series}_polygon_trades_{date}.zip", series=args.series, date=date
        )

        for item in (l2, trades):
            if item.get("exists"):
                totals["zip_bytes"] += int(item["zip_bytes"])
                totals["uncompressed_bytes"] += int(item["uncompressed_bytes"])
        if l2.get("exists"):
            totals["poly_l2_rows"] += int(l2["row_count"])
            totals["poly_l2_files"] += int(l2["parquet_files"])
        if trades.get("exists"):
            totals["polygon_trades_rows"] += int(trades["row_count"])
            totals["polygon_trades_files"] += int(trades["parquet_files"])

        days.append({"date": date, "poly_l2": l2, "polygon_trades": trades})

    report = {
        "series": args.series,
        "start_date": args.start_date,
        "end_date": args.end_date,
        "day_count": len(days),
        "expected_market_files_per_zip": 288,
        "totals": totals,
        "all_expected_files_present": all(
            day["poly_l2"].get("exists") and day["polygon_trades"].get("exists") for day in days
        ),
        "all_zips_ok": all(
            day["poly_l2"].get("zip_ok") and day["polygon_trades"].get("zip_ok") for day in days
        ),
        "all_zips_have_288_parquets": all(
            day["poly_l2"].get("parquet_files") == 288
            and day["polygon_trades"].get("parquet_files") == 288
            for day in days
        ),
        "days": days,
    }

    args.out.parent.mkdir(parents=True, exist_ok=True)
    args.out.write_text(json.dumps(report, indent=2), encoding="utf-8")
    print(f"wrote {args.out}")
    print(json.dumps({k: report[k] for k in ("day_count", "totals", "all_expected_files_present", "all_zips_ok", "all_zips_have_288_parquets")}, indent=2))


if __name__ == "__main__":
    main()