"""Backfill the supplementary statement lines for filings already ingested.

``ingest.py`` now stores operating cash flow, net income, total assets,
receivables, inventory, payables, cost of revenue, share-based compensation
and depreciation alongside the headline metrics. Every filing ingested before
that has those columns empty, and a full re-ingest would re-download the
filing text, re-chunk it and re-embed it to obtain nine numbers that are
already in a file we can fetch once per company.

This walks the stored rows instead: one ``companyfacts`` request per ticker,
then a recompute per accession. It writes **only** the new columns. The
headline metrics, their selection contexts and their quality status are left
exactly as ingested -- a backfill that silently re-derived a verified revenue
figure would be indistinguishable from a corruption.

Usage::

    python -m scripts.backfill_statement_lines AAPL
    python -m scripts.backfill_statement_lines --all
    python -m scripts.backfill_statement_lines AAPL --dry-run
"""
from __future__ import annotations

import argparse
import sqlite3
import time

from ingestion.edgar import STATEMENT_LINES, compute_metrics_for_accn, get_all_xbrl_facts, get_cik
from storage import metrics_db

# One companyfacts document per ticker, so the pause is per company rather
# than per filing. Well inside the SEC's ten-requests-a-second policy.
_PAUSE_SECONDS = 0.5

_UPDATE_SQL = (
    "UPDATE metrics SET "
    + ", ".join(f"{name}=:{name}" for name in STATEMENT_LINES)
    + " WHERE ticker=:ticker AND period=:period"
)


def _write(values: dict) -> None:
    with sqlite3.connect(metrics_db.DB_PATH) as conn:
        conn.execute(_UPDATE_SQL, values)


def backfill(ticker: str, *, dry_run: bool = False) -> int:
    ticker = ticker.upper()
    rows = [r for r in metrics_db.get_all_metrics(ticker) if r.get("accession")]
    if not rows:
        print(f"{ticker}: no ingested filing carries an accession")
        return 1

    cik = get_cik(ticker)
    if not cik:
        print(f"{ticker}: no CIK")
        return 1
    facts = get_all_xbrl_facts(cik)

    filled = 0
    for row in rows:
        metrics = compute_metrics_for_accn(
            facts,
            row["accession"],
            row.get("form_type") or "10-Q",
            report_date=row.get("report_date") or "",
            filing_date=row.get("filing_date") or "",
        )
        values = {name: metrics.get(name) for name in STATEMENT_LINES}
        found = [name for name, value in values.items() if value is not None]
        print(f"  {row['period']}: {len(found)}/{len(STATEMENT_LINES)} line(s)"
              + (f" — missing {', '.join(n for n in STATEMENT_LINES if n not in found)}"
                 if len(found) < len(STATEMENT_LINES) else ""))
        if not dry_run and found:
            _write({**values, "ticker": ticker, "period": row["period"]})
            filled += 1

    print(f"{ticker}: {'dry run, nothing written' if dry_run else f'{filled} row(s) updated'}")
    return 0


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("ticker", nargs="?", help="Ticker to backfill.")
    parser.add_argument("--all", action="store_true", help="Every ingested ticker.")
    parser.add_argument("--dry-run", action="store_true", help="Fetch and report without writing.")
    args = parser.parse_args()

    if args.all:
        tickers = metrics_db.list_tickers()
    elif args.ticker:
        tickers = [args.ticker.upper()]
    else:
        parser.error("give a ticker or --all")

    metrics_db.init_db()
    failures = 0
    for ticker in tickers:
        print(f"\n== {ticker} ==")
        failures += backfill(ticker, dry_run=args.dry_run)
        time.sleep(_PAUSE_SECONDS)
    return 1 if failures else 0


if __name__ == "__main__":
    raise SystemExit(main())