"""Unit tests for the trade setup outcome evaluation service."""

from __future__ import annotations

from datetime import date, datetime, timedelta, timezone

import pytest
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.ohlcv import OHLCVRecord
from app.models.ticker import Ticker
from app.models.trade_setup import TradeSetup
from app.services.outcome_service import (
    OUTCOME_AMBIGUOUS,
    OUTCOME_EXPIRED,
    OUTCOME_STOP_HIT,
    OUTCOME_TARGET_HIT,
    Bar,
    evaluate_pending_setups,
    evaluate_setup_against_bars,
    get_performance_stats,
)


@pytest.fixture
async def outcome_session() -> AsyncSession:
    """DB session compatible with evaluate_pending_setups (which commits)."""
    from tests.conftest import _test_session_factory

    async with _test_session_factory() as session:
        yield session


def _bars(*hl: tuple[float, float], start: date = date(2026, 1, 5)) -> list[Bar]:
    return [
        Bar(date=start + timedelta(days=i), high=high, low=low)
        for i, (high, low) in enumerate(hl)
    ]


# ---------------------------------------------------------------------------
# evaluate_setup_against_bars — pure logic
# ---------------------------------------------------------------------------


class TestEvaluateSetupAgainstBars:
    def test_long_target_hit(self):
        # entry ~100, stop 95, target 110
        bars = _bars((105, 99), (111, 104))
        outcome, outcome_date = evaluate_setup_against_bars("long", 95, 110, bars)
        assert outcome == OUTCOME_TARGET_HIT
        assert outcome_date == bars[1].date

    def test_long_stop_hit(self):
        bars = _bars((105, 99), (103, 94))
        outcome, outcome_date = evaluate_setup_against_bars("long", 95, 110, bars)
        assert outcome == OUTCOME_STOP_HIT
        assert outcome_date == bars[1].date

    def test_long_stop_before_target_across_bars(self):
        # Stop hit on bar 0, target would hit on bar 1 — stop wins (first bar decides)
        bars = _bars((100, 94), (112, 100))
        outcome, _ = evaluate_setup_against_bars("long", 95, 110, bars)
        assert outcome == OUTCOME_STOP_HIT

    def test_short_target_hit(self):
        # short: entry ~100, stop 105, target 90
        bars = _bars((102, 96), (98, 89))
        outcome, outcome_date = evaluate_setup_against_bars("short", 105, 90, bars)
        assert outcome == OUTCOME_TARGET_HIT
        assert outcome_date == bars[1].date

    def test_short_stop_hit(self):
        bars = _bars((102, 96), (106, 98))
        outcome, _ = evaluate_setup_against_bars("short", 105, 90, bars)
        assert outcome == OUTCOME_STOP_HIT

    def test_ambiguous_when_both_levels_in_same_bar(self):
        # one giant bar spans both stop (95) and target (110)
        bars = _bars((112, 94))
        outcome, _ = evaluate_setup_against_bars("long", 95, 110, bars)
        assert outcome == OUTCOME_AMBIGUOUS

    def test_pending_when_not_enough_bars(self):
        bars = _bars((105, 99), (104, 98))
        outcome, outcome_date = evaluate_setup_against_bars("long", 95, 110, bars, max_bars=30)
        assert outcome is None
        assert outcome_date is None

    def test_expired_after_max_bars(self):
        bars = _bars(*[(105, 99)] * 10)
        outcome, outcome_date = evaluate_setup_against_bars("long", 95, 110, bars, max_bars=10)
        assert outcome == OUTCOME_EXPIRED
        assert outcome_date == bars[9].date

    def test_hit_beyond_max_bars_is_ignored(self):
        # target hit on bar 11 but window is 10 — expired
        bars = _bars(*[(105, 99)] * 10, (115, 105))
        outcome, _ = evaluate_setup_against_bars("long", 95, 110, bars, max_bars=10)
        assert outcome == OUTCOME_EXPIRED

    def test_no_bars_is_pending(self):
        outcome, _ = evaluate_setup_against_bars("long", 95, 110, [])
        assert outcome is None


# ---------------------------------------------------------------------------
# evaluate_pending_setups — DB integration
# ---------------------------------------------------------------------------


async def _make_ticker(db: AsyncSession, symbol: str = "AAPL") -> Ticker:
    ticker = Ticker(symbol=symbol)
    db.add(ticker)
    await db.flush()
    return ticker


def _make_setup(
    ticker: Ticker,
    direction: str = "long",
    entry: float = 100.0,
    stop: float = 95.0,
    target: float = 110.0,
    rr: float = 2.0,
    detected: datetime | None = None,
    **kwargs,
) -> TradeSetup:
    return TradeSetup(
        ticker_id=ticker.id,
        direction=direction,
        entry_price=entry,
        stop_loss=stop,
        target=target,
        rr_ratio=rr,
        composite_score=50.0,
        detected_at=detected or datetime(2026, 1, 2, 21, 0, tzinfo=timezone.utc),
        **kwargs,
    )


def _add_bars(db: AsyncSession, ticker: Ticker, *hl: tuple[float, float], start: date = date(2026, 1, 5)):
    for i, (high, low) in enumerate(hl):
        db.add(OHLCVRecord(
            ticker_id=ticker.id,
            date=start + timedelta(days=i),
            open=(high + low) / 2,
            high=high,
            low=low,
            close=(high + low) / 2,
            volume=1_000_000,
        ))


class TestEvaluatePendingSetups:
    async def test_writes_outcome_and_metadata(self, outcome_session: AsyncSession):
        ticker = await _make_ticker(outcome_session)
        setup = _make_setup(ticker)
        outcome_session.add(setup)
        _add_bars(outcome_session, ticker, (105, 99), (111, 104))
        await outcome_session.flush()

        summary = await evaluate_pending_setups(outcome_session)

        assert summary["evaluated"] == 1
        assert summary["by_outcome"] == {OUTCOME_TARGET_HIT: 1}
        result = await outcome_session.execute(select(TradeSetup))
        stored = result.scalar_one()
        assert stored.actual_outcome == OUTCOME_TARGET_HIT
        assert stored.outcome_date == date(2026, 1, 6)
        assert stored.evaluated_at is not None

    async def test_undecided_setup_stays_pending(self, outcome_session: AsyncSession):
        ticker = await _make_ticker(outcome_session)
        outcome_session.add(_make_setup(ticker))
        _add_bars(outcome_session, ticker, (105, 99))  # no level hit, < max_bars
        await outcome_session.flush()

        summary = await evaluate_pending_setups(outcome_session)

        assert summary["evaluated"] == 0
        assert summary["still_pending"] == 1
        result = await outcome_session.execute(select(TradeSetup))
        assert result.scalar_one().actual_outcome is None

    async def test_only_bars_after_detection_are_used(self, outcome_session: AsyncSession):
        ticker = await _make_ticker(outcome_session)
        # bar on the detection date itself would hit the stop — must be ignored
        _add_bars(outcome_session, ticker, (100, 90), start=date(2026, 1, 2))
        _add_bars(outcome_session, ticker, (111, 104), start=date(2026, 1, 5))
        outcome_session.add(_make_setup(ticker))
        await outcome_session.flush()

        await evaluate_pending_setups(outcome_session)

        result = await outcome_session.execute(select(TradeSetup))
        assert result.scalar_one().actual_outcome == OUTCOME_TARGET_HIT

    async def test_already_evaluated_setups_are_skipped(self, outcome_session: AsyncSession):
        ticker = await _make_ticker(outcome_session)
        outcome_session.add(_make_setup(ticker, actual_outcome=OUTCOME_STOP_HIT))
        await outcome_session.flush()

        summary = await evaluate_pending_setups(outcome_session)

        assert summary["evaluated"] == 0
        assert summary["still_pending"] == 0


# ---------------------------------------------------------------------------
# get_performance_stats
# ---------------------------------------------------------------------------


class TestGetPerformanceStats:
    async def test_empty_database(self, db_session: AsyncSession):
        stats = await get_performance_stats(db_session)
        assert stats["overall"]["total"] == 0
        assert stats["overall"]["hit_rate"] is None
        assert stats["pending"] == 0

    async def test_aggregation(self, db_session: AsyncSession):
        ticker = await _make_ticker(db_session)
        db_session.add(_make_setup(
            ticker, direction="long", rr=3.0,
            actual_outcome=OUTCOME_TARGET_HIT, confidence_score=80.0,
            recommended_action="LONG_HIGH",
        ))
        db_session.add(_make_setup(
            ticker, direction="long", rr=2.0,
            actual_outcome=OUTCOME_STOP_HIT, confidence_score=55.0,
            recommended_action="LONG_MODERATE",
        ))
        db_session.add(_make_setup(
            ticker, direction="short", rr=2.5,
            actual_outcome=OUTCOME_EXPIRED, confidence_score=40.0,
            recommended_action="NEUTRAL",
        ))
        db_session.add(_make_setup(ticker, direction="short"))  # pending
        await db_session.flush()

        stats = await get_performance_stats(db_session)

        overall = stats["overall"]
        assert overall["total"] == 3
        assert overall["wins"] == 1
        assert overall["losses"] == 1
        assert overall["expired"] == 1
        assert overall["hit_rate"] == 50.0
        # realized: +3.0 (win), -1.0 (loss), 0.0 (expired) → avg 0.667
        assert overall["avg_r"] == pytest.approx(0.667, abs=0.001)
        assert overall["total_r"] == pytest.approx(2.0)
        assert stats["pending"] == 1

        assert stats["by_direction"]["long"]["total"] == 2
        assert stats["by_direction"]["short"]["total"] == 1
        assert stats["by_action"]["LONG_HIGH"]["wins"] == 1
        assert stats["by_confidence"]["≥70%"]["wins"] == 1
        assert stats["by_confidence"]["50-70%"]["losses"] == 1
        assert stats["by_confidence"]["<50%"]["expired"] == 1

    async def test_ambiguous_counts_as_loss(self, db_session: AsyncSession):
        ticker = await _make_ticker(db_session)
        db_session.add(_make_setup(ticker, actual_outcome=OUTCOME_AMBIGUOUS))
        await db_session.flush()

        stats = await get_performance_stats(db_session)

        assert stats["overall"]["losses"] == 1
        assert stats["overall"]["hit_rate"] == 0.0
        assert stats["overall"]["avg_r"] == -1.0