"""
SEC Form 4 Insider Transactions (PIT) — collection recipe.

Contract (ziplime PIT recipe, design doc §9):

    async def fetch(since: datetime) -> pl.DataFrame

Returns rows in the PIT schema for `insider-transactions`:
  system:  entity_id, event_date, knowledge_date, knowledge_estimated
  values:  insider_name, insider_role, transaction_code, shares, price_per_share, shares_owned_after

The shared harness (ingest.py) stamps `ingested_at`, dedups against existing rows and
appends to the Delta bundle. This recipe only fetches and shapes.
"""
from __future__ import annotations
from datetime import datetime, timezone


async def fetch(since: datetime):
    import polars as pl  # noqa: F401
    import httpx
    import polars as pl

    rows = []
    for f4 in _stream_form4(since):                 # EDGAR full-text index, form=4
        doc = httpx.get(f4["xml_url"], headers=SEC_UA, timeout=60).text
        for txn in _parse_form4(doc):
            rows.append({
                "entity_id": f4["issuer_ticker"],
                "event_date": txn["transaction_date"],
                "knowledge_date": f4["accepted_at"],
                "knowledge_estimated": False,
                "insider_name": f4["reporter"],
                "insider_role": txn["role"],
                "transaction_code": txn["code"],
                "shares": txn["shares"],
                "price_per_share": txn["price"],
                "shares_owned_after": txn["owned_after"],
            })
    return pl.DataFrame(rows)


if __name__ == "__main__":
    import asyncio, polars as pl
    df = asyncio.run(fetch(datetime(2025, 1, 1, tzinfo=timezone.utc)))
    print(df.head())