"""Backfill 90 days of daily OHLCV bars from Polygon into market_snapshots.

Run as: python scripts/backfill_market_data.py
Requires env vars: POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_HOST,
                   POSTGRES_PORT, POSTGRES_DB, MARKET_DATA_API_KEY,
                   MARKET_DATA_BASE_URL (optional, defaults to polygon).

Skips if market_snapshots already has >= 50 bars.
"""

import asyncio
import hashlib
import json
import os
import sys
from datetime import date, datetime, timedelta, timezone

import asyncpg
import httpx


async def backfill() -> None:
    api_key = os.environ.get("MARKET_DATA_API_KEY", "")
    if not api_key:
        print("No MARKET_DATA_API_KEY set — skipping backfill.")
        return

    base_url = os.environ.get("MARKET_DATA_BASE_URL", "https://api.polygon.io")
    dsn = (
        f"postgresql://{os.environ['POSTGRES_USER']}:{os.environ['POSTGRES_PASSWORD']}"
        f"@{os.environ['POSTGRES_HOST']}:{os.environ['POSTGRES_PORT']}"
        f"/{os.environ['POSTGRES_DB']}"
    )
    pool = await asyncpg.create_pool(dsn=dsn)

    # Check if backfill is needed
    count = await pool.fetchval(
        "SELECT count(*) FROM market_snapshots WHERE snapshot_type = 'bar'"
    )
    if count >= 50:
        print(f"Market data has {count} bars — skipping backfill.")
        await pool.close()
        return

    print(f"Only {count} market bars found — backfilling 90 days from Polygon...")

    tickers = [
        r["ticker"]
        for r in await pool.fetch(
            "SELECT ticker FROM companies WHERE active = TRUE ORDER BY ticker"
        )
    ]
    to_d = date.today().isoformat()
    from_d = (date.today() - timedelta(days=90)).isoformat()
    total = 0

    async with httpx.AsyncClient(timeout=30) as client:
        for ticker in tickers:
            url = f"{base_url}/v2/aggs/ticker/{ticker}/range/1/day/{from_d}/{to_d}"
            try:
                resp = await client.get(
                    url,
                    params={
                        "apiKey": api_key,
                        "adjusted": "true",
                        "sort": "asc",
                        "limit": "500",
                    },
                )
                resp.raise_for_status()
                bars = resp.json().get("results", [])
            except Exception as e:
                print(f"  {ticker}: fetch failed ({e})")
                continue

            existing = {
                r["bar_ts"]
                for r in await pool.fetch(
                    "SELECT DISTINCT (data->>'t')::bigint AS bar_ts "
                    "FROM market_snapshots WHERE ticker = $1 AND snapshot_type = 'bar'",
                    ticker,
                )
                if r["bar_ts"]
            }
            co = await pool.fetchrow(
                "SELECT id FROM companies WHERE ticker = $1", ticker
            )
            cid = co["id"] if co else None
            inserted = 0

            for bar in bars:
                bar_ts = bar.get("t")
                if not bar_ts or bar_ts in existing:
                    continue
                bj = json.dumps(bar)
                ch = hashlib.sha256(bj.encode()).hexdigest()
                ca = datetime.fromtimestamp(bar_ts / 1000, tz=timezone.utc)
                await pool.execute(
                    "INSERT INTO market_snapshots "
                    "(company_id, ticker, snapshot_type, data, source_provider, "
                    "captured_at, content_hash) "
                    "VALUES ($1, $2, 'bar', $3::jsonb, 'polygon_backfill', $4, $5)",
                    cid,
                    ticker,
                    bj,
                    ca,
                    ch,
                )
                existing.add(bar_ts)
                inserted += 1

            total += inserted
            if inserted:
                print(f"  {ticker}: {inserted} bars")

    await pool.close()
    print(f"Backfill complete: {total} bars across {len(tickers)} tickers")


if __name__ == "__main__":
    try:
        asyncio.run(backfill())
    except Exception as e:
        print(f"Backfill failed: {e}", file=sys.stderr)
        sys.exit(0)  # Don't block startup on backfill failure