"""Backfill earnings-call transcripts that ``ingest.py`` can no longer reach.

Two gaps leave a stored period without its transcript, and neither is repaired
by a normal delta run:

1. **The filing aged out of EDGAR's "recent" index.** ``ingest.py`` walks
   ``submissions/CIK.json``'s ``filings.recent`` array to decide which periods
   to process. A heavy filer (Alphabet files hundreds of Form 4s a year) pushes
   its own older 10-Qs out of that array into the paginated archive, so the
   period stays in ``metrics.db`` but is never revisited — and its missing
   transcript is never fetched.

2. **A stale "unavailable" marker.** ``sections.db`` records an empty string to
   mean "asked the provider, it had nothing", which correctly stops a delta run
   from re-asking every time. But providers backfill their own archives, so a
   marker written months ago can be wrong today.

This script targets exactly the periods that are missing a transcript, asks the
provider again, and stores anything it gets through the same code path
ingestion uses (``sections.db`` plus the Chroma transcript collection).

Usage::

    python scripts/backfill_transcripts.py                # report only
    python scripts/backfill_transcripts.py --apply        # every ticker
    python scripts/backfill_transcripts.py --apply GOOGL TSLA
"""
from __future__ import annotations

import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from dotenv import load_dotenv

load_dotenv()

from ingestion.embedder import embed_and_store_transcript
from ingestion.transcript import fetch_transcript
from storage.metrics_db import get_all_metrics
from storage.sections_db import get_section, init_sections_db, upsert_section


def _period_to_av_quarter(period: str) -> str:
    """EDGAR period → provider quarter. 'Q12026' → '2026Q1'; 'FY2024' → '2024Q4'."""
    period = (period or "").strip()
    if len(period) < 6:
        return ""
    if period.startswith("FY"):
        year = period[2:]
        return f"{year}Q4" if len(year) == 4 and year.isdigit() else ""
    if period[0] == "Q" and period[1] in "1234":
        year = period[2:]
        return f"{year}{period[:2]}" if len(year) == 4 and year.isdigit() else ""
    return ""


def _known_tickers() -> list[str]:
    import sqlite3

    from storage.metrics_db import DB_PATH

    if not DB_PATH.exists():
        return []
    with sqlite3.connect(DB_PATH) as conn:
        return [row[0] for row in conn.execute(
            "SELECT DISTINCT ticker FROM metrics ORDER BY ticker"
        )]


def find_gaps(ticker: str) -> list[dict]:
    """Stored periods whose transcript is absent or recorded as unavailable."""
    gaps: list[dict] = []
    for row in get_all_metrics(ticker) or []:
        period = str(row.get("period") or "")
        form_type = str(row.get("form_type") or "")
        if not period or form_type not in ("10-Q", "10-K"):
            continue
        stored = get_section(ticker, period, "transcript")
        if stored:
            continue
        gaps.append({
            "ticker": ticker,
            "period": period,
            "form_type": form_type,
            "company_name": str(row.get("company_name") or ticker),
            "filing_date": str(row.get("filing_date") or ""),
            # None = never asked; "" = asked, provider had nothing at the time.
            "reason": "never_attempted" if stored is None else "marked_unavailable",
        })
    return gaps


def backfill(ticker: str, apply: bool) -> tuple[int, int]:
    """Return (gaps found, transcripts stored)."""
    gaps = find_gaps(ticker)
    if not gaps:
        print(f"[{ticker}] complete — every stored period has a transcript.")
        return 0, 0

    stored_count = 0
    for gap in gaps:
        quarter = _period_to_av_quarter(gap["period"])
        if not quarter:
            print(f"[{ticker}] {gap['period']}: unparseable period, skipped.")
            continue

        if not apply:
            print(f"[{ticker}] {gap['period']} ({quarter}) — missing ({gap['reason']})")
            continue

        try:
            text = fetch_transcript(ticker, quarter) or ""
        except Exception as exc:
            print(f"[{ticker}] {gap['period']}: provider error — {exc}")
            continue

        # Writing the empty string back is deliberate: it records that the
        # provider was asked and had nothing, which is what stops a delta run
        # from re-asking on every ingestion.
        upsert_section(ticker, gap["period"], gap["form_type"], "transcript", text)
        if not text:
            print(f"[{ticker}] {gap['period']} ({quarter}): provider still has nothing.")
            continue

        embed_and_store_transcript(
            ticker=ticker,
            company_name=gap["company_name"],
            transcript_text=text,
            transcript_date=gap["filing_date"],
            period=gap["period"],
            source_url="",
            provider="alphavantage",
        )
        stored_count += 1
        print(f"[{ticker}] {gap['period']} ({quarter}): stored {len(text):,} chars.")

    return len(gaps), stored_count


def main(argv: list[str]) -> int:
    apply = "--apply" in argv
    tickers = [a.upper() for a in argv if not a.startswith("--")] or _known_tickers()
    if not tickers:
        print("No ingested tickers found. Run ingest.py first.")
        return 1

    init_sections_db()
    total_gaps = total_stored = 0
    for ticker in tickers:
        gaps, stored = backfill(ticker, apply)
        total_gaps += gaps
        total_stored += stored

    if apply:
        print(f"\nDone. {total_stored} transcript(s) stored across {len(tickers)} ticker(s).")
    else:
        print(f"\n{total_gaps} gap(s) found. Re-run with --apply to fetch them.")
    return 0


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