from dataclasses import replace
from datetime import date, timedelta
from decimal import Decimal

import pytest

from zhixing_server.modules.sector_radar.application.scoring import (
    calculate_rankings,
    calendar_rank_changes,
    comparison_dates,
)
from zhixing_server.modules.sector_radar.domain.models import (
    MetricKind,
    RankedMetric,
    RankSide,
    SectorDailyAggregate,
    SectorType,
)
from zhixing_server.modules.sector_radar.domain.ranking import select_percentile_side
from zhixing_server.modules.sector_radar.domain.weighted import (
    RATIO_WEIGHTED_VERSION,
    SWING_WEIGHTED_VERSION,
    resolve_metric_version,
)

DAYS = tuple(
    date(2026, 9, 1) + timedelta(days=n)
    for n in range(21)
    if (date(2026, 9, 1) + timedelta(days=n)).weekday() < 5
)


def aggregate(
    code: str,
    day: date,
    ratio: str,
    turnover: str = "9999999999",
    kind: SectorType = SectorType.CONCEPT,
) -> SectorDailyAggregate:
    amount = Decimal(turnover)
    return SectorDailyAggregate(
        day,
        kind,
        code,
        code,
        10,
        10,
        Decimal(ratio) * (amount + 100),
        amount,
        Decimal(1),
        Decimal(1),
    )


def scores(
    rows: list[SectorDailyAggregate], target: date = DAYS[9]
) -> dict[tuple[SectorType, str, MetricKind], RankedMetric]:
    return {
        (row.observation.sector_type, row.observation.sector_code, row.observation.metric_kind): row
        for row in calculate_rankings(
            target,
            [item for item in rows if item.trade_date == target],
            [item for item in rows if item.trade_date != target],
            DAYS,
        )
    }


def test_liquidity_weight_can_reverse_raw_ratio_order_and_separates_pools() -> None:
    rows = [
        aggregate(code, day, ratio, turnover, kind)
        for day in DAYS[:10]
        for code, ratio, turnover, kind in [
            ("small", ".3", "999999", SectorType.CONCEPT),
            ("large", ".2", "999999999999", SectorType.CONCEPT),
            ("medium", ".1", "9999999999", SectorType.CONCEPT),
            ("industry", "-.5", "9999999999", SectorType.INDUSTRY),
        ]
    ]
    ranked = scores(rows)
    small = ranked[(SectorType.CONCEPT, "small", MetricKind.RATIO)]
    large = ranked[(SectorType.CONCEPT, "large", MetricKind.RATIO)]
    assert small.observation.value == Decimal(".3")
    assert small.observation.weighted_score == 600
    assert large.observation.weighted_score == 800
    assert large.rank_position == 1 and small.rank_position == 2
    assert (
        ranked[(SectorType.INDUSTRY, "industry", MetricKind.RATIO)].observation.weighted_score
        == 1000
    )


def test_swing_ranks_each_window_before_combining_not_the_averaged_raw_ratio() -> None:
    rows = [
        aggregate(code, day, ratio)
        for index, day in enumerate(DAYS[:10])
        for code, ratio in [("A", ".1" if index >= 7 else "-.1"), ("B", ".03"), ("C", ".05")]
    ]
    ranked = scores(rows)
    a = ranked[(SectorType.CONCEPT, "A", MetricKind.SWING)]
    b = ranked[(SectorType.CONCEPT, "B", MetricKind.SWING)]
    assert a.observation.value == b.observation.value == Decimal(".03")
    assert a.observation.weighted_score == pytest.approx(Decimal("666.6666666666667"))
    assert b.observation.weighted_score == 500
    assert a.rank_position == 2 and b.rank_position == 3


def test_tied_features_use_average_percentiles_and_code_breaks_final_ties() -> None:
    ranked = scores([aggregate(code, day, "0") for day in DAYS[:10] for code in ["B", "A"]])
    assert ranked[(SectorType.CONCEPT, "A", MetricKind.RATIO)].observation.weighted_score == 750
    assert ranked[(SectorType.CONCEPT, "B", MetricKind.RATIO)].observation.weighted_score == 750
    assert ranked[(SectorType.CONCEPT, "A", MetricKind.RATIO)].rank_position == 1


def test_missing_calendar_session_is_not_replaced_by_an_older_success() -> None:
    rows = [aggregate("A", day, ".2") for day in DAYS[:10] if day != DAYS[7]]
    ranked = scores(rows)
    daily = ranked[(SectorType.CONCEPT, "A", MetricKind.RATIO)]
    assert daily.observation.value == Decimal(".2")
    assert daily.observation.weighted_score is None and daily.rank_position is None
    assert ranked[(SectorType.CONCEPT, "A", MetricKind.SWING)].observation.value is None


def test_future_inputs_do_not_affect_scores_and_bottom_uses_score_order() -> None:
    rows = [
        aggregate(f"C{n}", day, str(n), str(10 ** (6 + n) - 1))
        for day in DAYS[:10]
        for n in range(1, 11)
    ]
    original = scores(rows)
    future = scores(rows + [aggregate("C1", DAYS[10], "1000000")])
    assert future == original
    ratio_rows = [
        row for row in original.values() if row.observation.metric_kind is MetricKind.RATIO
    ]
    bottom = select_percentile_side(ratio_rows, RankSide.BOTTOM)
    assert [row.observation.sector_code for row in bottom] == ["C1"]


def test_rank_changes_resolve_trading_dates_and_do_not_mix_versions() -> None:
    rows = [aggregate("A", day, ".1") for day in DAYS[:11]]
    before = tuple(scores(rows, DAYS[9]).values())
    current = tuple(scores(rows, DAYS[10]).values())
    assert comparison_dates(DAYS, DAYS[10])[1] == DAYS[9]
    missing = calendar_rank_changes(current, {DAYS[8]: before}, DAYS, DAYS[10])
    assert all(row.rank_change(1) is None for row in missing)
    older = tuple(
        replace(row, observation=replace(row.observation, metric_version="legacy"))
        for row in before
    )
    incompatible = calendar_rank_changes(current, {DAYS[9]: older}, DAYS, DAYS[10])
    assert all(row.rank_change(1) is None for row in incompatible)
    comparable = calendar_rank_changes(current, {DAYS[9]: before}, DAYS, DAYS[10])
    assert all(row.rank_change(1) == 0 for row in comparable)
    assert (
        resolve_metric_version(MetricKind.RATIO, [RATIO_WEIGHTED_VERSION]) == RATIO_WEIGHTED_VERSION
    )
    assert (
        resolve_metric_version(MetricKind.SWING, [SWING_WEIGHTED_VERSION]) == SWING_WEIGHTED_VERSION
    )