from __future__ import annotations

import math
from datetime import datetime, timedelta, timezone

import pytest
from sqlalchemy import create_engine
from sqlalchemy.orm import Session
from sqlalchemy.pool import StaticPool

from app.activity import activity_rows
from app.database import Base
from app.models import CatchReport, Fish, ModerationStatus, SourceType, Spot, Waterbody


NOW = datetime(2026, 9, 3, 6, 0, tzinfo=timezone.utc)


@pytest.fixture
def db() -> Session:
    engine = create_engine("sqlite://", connect_args={"check_same_thread": False}, poolclass=StaticPool)
    Base.metadata.create_all(engine)
    with Session(engine) as session:
        yield session
    engine.dispose()


def add_report(
    db: Session,
    *,
    age_hours: float,
    player: str | None = "Player",
    confidence: int = 100,
    status: ModerationStatus = ModerationStatus.approved,
    deleted: bool = False,
    source: SourceType = SourceType.user,
    weight_g: int = 5_000,
) -> CatchReport:
    waterbody = db.query(Waterbody).first()
    fish = db.query(Fish).first()
    spot = db.query(Spot).first()
    if waterbody is None:
        waterbody = Waterbody(slug="test-lake", name_ru="Тестовое озеро", unlock_level=1)
        fish = Fish(slug="pike", name_ru="Щука", trophy_weight_g=10_000)
        spot = Spot(waterbody=waterbody, x=10, y=20, description=None)
        db.add_all([waterbody, fish, spot])
        db.flush()
    report = CatchReport(
        fish=fish,
        spot=spot,
        waterbody=waterbody,
        bait=None,
        weight_g=weight_g,
        fishing_method="spinning",
        caught_at=NOW - timedelta(hours=age_hours),
        reported_at=NOW - timedelta(hours=age_hours),
        player_name=player,
        source_type=source,
        source_confidence=confidence,
        moderation_status=status,
        deleted_at=NOW if deleted else None,
    )
    db.add(report)
    db.commit()
    return report


def test_freshness_and_source_confidence_follow_documented_formula(db: Session) -> None:
    add_report(db, age_hours=18, confidence=80)

    row = activity_rows(db, hours=24, now=NOW)[0]
    weighted = math.exp(-1) * 0.8
    expected_activity = round(55 * weighted / 12 + 25 / 6)
    expected_confidence = round(45 / 10 + 35 / 5 + 20 * 0.8)

    assert row.activity_score == expected_activity
    assert row.confidence_score == expected_confidence


def test_repeated_reports_from_one_player_do_not_add_unique_player_weight(db: Session) -> None:
    add_report(db, age_hours=1, player=" Same Player ")
    add_report(db, age_hours=1, player="same player")
    add_report(db, age_hours=1, player=None)

    row = activity_rows(db, hours=6, now=NOW)[0]

    assert row.catches == 3
    assert row.unique_players == 1
    assert "3 свежих улова от 1 игрока" in row.explanation


def test_explanation_describes_low_data_and_confidence(db: Session) -> None:
    add_report(db, age_hours=2, player="Player", confidence=50)

    row = activity_rows(db, hours=6, now=NOW)[0]

    assert row.explanation.startswith("Низкая активность: 1 свежий улов от 1 игрока.")
    assert "Уверенность низкая." in row.explanation
    assert "Данных мало: нужно хотя бы 3 наблюдения." in row.explanation


def test_pending_rejected_and_deleted_reports_are_excluded(db: Session) -> None:
    add_report(db, age_hours=1)
    add_report(db, age_hours=1, status=ModerationStatus.pending)
    add_report(db, age_hours=1, status=ModerationStatus.rejected)
    add_report(db, age_hours=1, deleted=True)

    row = activity_rows(db, hours=6, now=NOW)[0]

    assert row.catches == 1


@pytest.mark.parametrize(
    ("hours", "expected_catches"),
    [(6, 1), (12, 2), (24, 3), (72, 4)],
)
def test_supported_windows_are_deterministic(db: Session, hours: int, expected_catches: int) -> None:
    for age in (5, 11, 23, 71, 73):
        add_report(db, age_hours=age, player=f"Player {age}")

    row = activity_rows(db, hours=hours, now=NOW)[0]

    assert row.catches == expected_catches


def test_reports_without_coordinates_do_not_create_activity_group(db: Session) -> None:
    report = add_report(db, age_hours=1, source=SourceType.official_record)
    report.spot = None
    db.commit()

    assert activity_rows(db, hours=72, now=NOW) == []