"""Delisting lifecycle: marking, the active_only filter, and SEC confirmation.

The behaviour under test is that a delisted symbol leaves the *live* path while
its rows stay put — deleting it instead is what makes the backtest universe
survivorship-biased, so retention is the point, not a side effect.
"""

from __future__ import annotations

import json
from collections.abc import AsyncGenerator
from datetime import date

import httpx
import pytest
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

from app.database import Base
from app.models.ticker import Ticker
from app.services import ticker_service
from app.services.sec_client import SecClient

_engine = create_async_engine("sqlite+aiosqlite://", echo=False)
_session_factory = async_sessionmaker(_engine, class_=AsyncSession, expire_on_commit=False)


@pytest.fixture(autouse=True)
async def _setup_tables() -> AsyncGenerator[None, None]:
    async with _engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield
    async with _engine.begin() as conn:
        await conn.run_sync(Base.metadata.drop_all)


@pytest.fixture
async def session() -> AsyncGenerator[AsyncSession, None]:
    async with _session_factory() as s:
        yield s


def _submissions(forms: list[str], dates: list[str]) -> dict:
    return {
        "cik": 712515,
        "name": "ELECTRONIC ARTS INC.",
        "filings": {"recent": {"form": forms, "filingDate": dates}},
    }


def _sec_client(payload: dict) -> SecClient:
    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(200, content=json.dumps(payload).encode())

    return SecClient(transport=httpx.MockTransport(handler), spacing_seconds=0)


async def test_mark_delisted_is_idempotent(session: AsyncSession):
    session.add(Ticker(symbol="EA"))
    await session.commit()

    assert await ticker_service.mark_delisted(
        session, "EA", delisted_on=date(2026, 8, 4)
    ) is True
    # A second call must not churn the row — the staleness path retries daily.
    assert await ticker_service.mark_delisted(
        session, "EA", delisted_on=date(2026, 9, 1)
    ) is False

    row = (await session.execute(select(Ticker).where(Ticker.symbol == "EA"))).scalar_one()
    assert row.delisted_on == date(2026, 8, 4)  # first date wins, not the retry
    assert row.delisted_reason == ticker_service.REASON_MANUAL


async def test_clear_delisted_restores_the_symbol(session: AsyncSession):
    session.add(Ticker(symbol="EA"))
    await session.commit()
    await ticker_service.mark_delisted(session, "EA", delisted_on=date(2026, 8, 4))

    assert await ticker_service.clear_delisted(session, "EA") is True
    assert await ticker_service.clear_delisted(session, "EA") is False

    row = (await session.execute(select(Ticker).where(Ticker.symbol == "EA"))).scalar_one()
    assert row.delisted_on is None and row.delisted_reason is None


async def test_active_only_filters_but_the_row_survives(session: AsyncSession):
    session.add_all([Ticker(symbol="AAPL"), Ticker(symbol="EA")])
    await session.commit()
    await ticker_service.mark_delisted(session, "EA", delisted_on=date(2026, 8, 4))

    active = (
        await session.execute(ticker_service.active_only(select(Ticker.symbol)))
    ).scalars().all()
    assert list(active) == ["AAPL"]

    # The whole point: the row — and everything cascading off it — is still there.
    everything = [t.symbol for t in await ticker_service.list_tickers(session)]
    assert everything == ["AAPL", "EA"]


async def test_confirm_delisting_marks_on_a_form_25(session: AsyncSession, monkeypatch):
    session.add(Ticker(symbol="EA", cik="0000712515"))
    await session.commit()
    monkeypatch.setattr(
        ticker_service,
        "_sec_client_factory",
        lambda: _sec_client(_submissions(["8-K", "25-NSE"], ["2026-07-01", "2026-08-04"])),
        raising=False,
    )

    marked = await ticker_service.confirm_delisting(
        session, "EA", last_bar=date(2026, 8, 4), today=date(2026, 8, 11)
    )
    assert marked == date(2026, 8, 4)

    row = (await session.execute(select(Ticker).where(Ticker.symbol == "EA"))).scalar_one()
    assert row.delisted_reason == ticker_service.REASON_FORM_25


async def test_confirm_delisting_leaves_a_halt_alone(session: AsyncSession, monkeypatch):
    """A halt or a rename files no Form 25 — those must keep warning, not retire."""
    session.add(Ticker(symbol="SATS", cik="0000012345"))
    await session.commit()
    monkeypatch.setattr(
        ticker_service,
        "_sec_client_factory",
        lambda: _sec_client(_submissions(["8-K", "10-Q"], ["2026-07-01", "2026-08-04"])),
        raising=False,
    )

    assert await ticker_service.confirm_delisting(
        session, "SATS", last_bar=date(2026, 8, 4), today=date(2026, 8, 11)
    ) is None
    row = (await session.execute(select(Ticker).where(Ticker.symbol == "SATS"))).scalar_one()
    assert row.delisted_on is None


async def test_confirm_delisting_skips_a_symbol_without_a_cik(session: AsyncSession):
    """No CIK, no SEC lookup — must not raise, and must not mark."""
    session.add(Ticker(symbol="ADRX"))
    await session.commit()
    assert await ticker_service.confirm_delisting(
        session, "ADRX", last_bar=date(2026, 8, 4), today=date(2026, 8, 11)
    ) is None


async def test_delisting_filing_picks_the_newest_match():
    client = _sec_client(
        _submissions(
            ["25", "8-K", "25-NSE", "15-12B"],
            ["2024-01-02", "2026-08-01", "2026-08-04", "2025-05-05"],
        )
    )
    async with client as c:
        found = await c.delisting_filing("0000712515")
    assert found == {"form": "25-NSE", "filing_date": date(2026, 8, 4)}


async def test_delisting_filing_returns_none_without_one():
    client = _sec_client(_submissions(["10-K", "8-K"], ["2026-01-02", "2026-08-01"]))
    async with client as c:
        assert await c.delisting_filing("0000320193") is None


async def test_confirm_delisting_waits_before_spending_a_request(session: AsyncSession, monkeypatch):
    """A one-day gap is a weekend or a hiccup. Probing every stale symbol during a
    market-data outage would be one SEC request per symbol per run."""
    session.add(Ticker(symbol="EA", cik="0000712515"))
    await session.commit()

    def _explode():
        raise AssertionError("must not reach SEC before the stale threshold")

    monkeypatch.setattr(ticker_service, "_sec_client_factory", _explode, raising=False)

    assert await ticker_service.confirm_delisting(
        session, "EA", last_bar=date(2026, 8, 10), today=date(2026, 8, 11)
    ) is None
    # ...and no bars at all is an ingestion problem, not a delisting.
    assert await ticker_service.confirm_delisting(
        session, "EA", last_bar=None, today=date(2026, 8, 11)
    ) is None