"""
"Jakter Jesper"-visningsmodus for frittstående runder (migrasjon 093, del 2
av ADR-106). Speiler tests/test_net_hunt_display.py (org-individuell) sitt
mønster og bevis: løpende tall skiller seg fra standard midt i runden, men
konvergerer eksakt ved 18 fullførte hull.
"""

from fastapi import HTTPException
import pytest

from app.auth import CurrentUser
from app.routers.rounds import HoleUpdate, RoundUpdate, get_leaderboard, get_round, update_hole, update_round

from tests.conftest import create_hole, create_participant, create_round, create_user

import app.db as app_db


async def _score(round_id, participant_id, user_id, scores: list[int]) -> None:
    user = CurrentUser(user_id=user_id)
    for n, gross in enumerate(scores, start=1):
        await update_hole(
            round_id, participant_id, n,
            HoleUpdate(score=gross, expected_version=None),
            user=user,
        )


async def _setup_stroke_round(user_id, course_handicap=12):
    async with app_db.plain_connection() as conn:
        round_id = await create_round(conn, user_id)
        participant_id = await create_participant(
            conn, round_id, user_id=user_id, is_owner=True, course_handicap_snapshot=course_handicap,
        )
        for n in range(1, 19):
            await create_hole(conn, participant_id, hole_number=n, par=4, stroke_index=n)
        await conn.execute("UPDATE round SET play_format = 'stroke' WHERE id = $1", round_id)
    return round_id, participant_id


async def test_hunt_differs_mid_round_but_converges_at_completion(pool):
    user_id = await create_user()
    round_id, participant_id = await _setup_stroke_round(user_id, course_handicap=12)

    # Hull 1, par -- stroke_index 1 (<=12) -> mottar 1 slag under standard.
    await _score(round_id, participant_id, user_id, [4])

    out = await get_round(round_id, user=CurrentUser(user_id=user_id))
    # Standard (default): netto = 4-1=3, til par = 3-4 = -1.
    assert out.my_net_score_to_par == -1

    await update_round(round_id, RoundUpdate(net_display_style="hunt"), user=CurrentUser(user_id=user_id))
    out = await get_round(round_id, user=CurrentUser(user_id=user_id))
    # Hunt: gross(4) - FULLT course handicap(12) = -8, til par = -8-4 = -12.
    assert out.my_net_score_to_par == -12

    lb = await get_leaderboard(round_id, user=CurrentUser(user_id=user_id))
    assert lb.net_display_style == "hunt"
    assert lb.entries[0].net_score_to_par == -12
    assert lb.entries[0].course_handicap == 12

    # Fullfør runden med par på alle resterende hull -- flatt hele veien
    # under hunt (alltid par -> gross-til-par alltid 0).
    await _score(round_id, participant_id, user_id, [4] * 17)
    out = await get_round(round_id, user=CurrentUser(user_id=user_id))
    assert out.my_net_score_to_par == -12

    # Bytt tilbake til standard nå som runden er fullført -- KONVERGERER
    # til nøyaktig samme tall (selve beviset på ekvivalensen).
    await update_round(round_id, RoundUpdate(net_display_style="standard"), user=CurrentUser(user_id=user_id))
    out = await get_round(round_id, user=CurrentUser(user_id=user_id))
    assert out.my_net_score_to_par == -12

    lb = await get_leaderboard(round_id, user=CurrentUser(user_id=user_id))
    assert lb.entries[0].net_score_to_par == -12


async def test_hunt_rejected_for_non_stroke_play_format(pool):
    user_id = await create_user()
    round_id, participant_id = await _setup_stroke_round(user_id)
    async with app_db.plain_connection() as conn:
        await conn.execute("UPDATE round SET play_format = 'stableford' WHERE id = $1", round_id)

    with pytest.raises(HTTPException) as exc_info:
        await update_round(round_id, RoundUpdate(net_display_style="hunt"), user=CurrentUser(user_id=user_id))
    assert exc_info.value.status_code == 400


async def test_switching_away_from_stroke_rejected_while_hunt_active(pool):
    user_id = await create_user()
    round_id, participant_id = await _setup_stroke_round(user_id)
    await update_round(round_id, RoundUpdate(net_display_style="hunt"), user=CurrentUser(user_id=user_id))

    with pytest.raises(HTTPException) as exc_info:
        await update_round(round_id, RoundUpdate(play_format="stableford"), user=CurrentUser(user_id=user_id))
    assert exc_info.value.status_code == 400

    # Men lov når begge felt endres sammen i samme kall.
    out = await update_round(
        round_id,
        RoundUpdate(play_format="stableford", net_display_style="standard"),
        user=CurrentUser(user_id=user_id),
    )
    assert out.play_format == "stableford"
    assert out.net_display_style == "standard"