from dataclasses import replace

import pytest

from dojo.board import Pos
from dojo.events import (
    Event,
    ExamTaken,
    FightKind,
    GameOver,
    KumiteFought,
    Moved,
    Source,
    TrackChanged,
    TurnSkipped,
    TurnStarted,
)
from dojo.metrics import KUMITE_SECONDS, TURN_SECONDS, GameMetrics, measure, summarize
from dojo.rules import DEFAULT_RULES

HOME_0 = Pos(0, 1)  # quadrant 0


def fought(
    attacker: int, defender: int, kind: FightKind, *, won: bool = True, exam: bool = False
) -> KumiteFought:
    return KumiteFought(attacker, defender, 0, 0, 4, 3, won, kind, exam, cards=())


def run(events: list[Event], players: int = 2) -> GameMetrics:
    corners = tuple(range(players))
    bots = ("balanced", "random", "farmer")[:players]
    return measure(events, DEFAULT_RULES, corners, bots, scenario="test", seed=3)


def test_measure_counts_fights_income_and_exams() -> None:
    metrics = run(
        [
            TurnStarted(1, 0, 7),
            Moved(0, (HOME_0,)),
            TrackChanged(0, 0, 1, Source.SQUARE),
            TurnStarted(1, 1, 5),
            Moved(1, (HOME_0,)),
            TrackChanged(1, 0, 1, Source.SQUARE),
            fought(1, 0, FightKind.EQUAL),
            TrackChanged(1, 1, 4, Source.KUMITE),
            TrackChanged(0, 1, 0, Source.KUMITE),
            fought(1, 0, FightKind.UPSET),
            TurnStarted(2, 0, 6),
            fought(1, 0, FightKind.EXPECTED),  # Player 1 defends: not part of a chain.
            TrackChanged(0, 0, 5, Source.CARD),
            TrackChanged(0, 5, 4, Source.CARD),
            fought(0, 1, FightKind.EQUAL, won=False, exam=True),
            fought(0, 1, FightKind.EQUAL, exam=True),
            ExamTaken(0, 1, passed=True),
            GameOver(0, 2),
        ]
    )

    assert (metrics.kumite, metrics.upsets, metrics.expected_wins) == (3, 1, 1)
    assert metrics.max_chain == 2
    assert (metrics.exam_attempts, metrics.exam_passes, metrics.exam_challengers) == (1, 1, 1)
    assert (metrics.square_gain, metrics.square_loss) == (2, 0)
    assert (metrics.kumite_gain, metrics.kumite_loss) == (3, -1)
    assert (metrics.card_gain, metrics.card_loss) == (5, -1)
    assert (metrics.square_income_home, metrics.square_income_away) == (1, 1)
    assert (metrics.winner_seat, metrics.winner_bot, metrics.rounds) == (0, "balanced", 2)
    # Both Exam rounds count as fights for the time estimate.
    assert metrics.minutes == pytest.approx(round((3 * TURN_SECONDS + 5 * KUMITE_SECONDS) / 60, 1))


def test_standings_are_sampled_at_turn_ends() -> None:
    metrics = run(
        [
            TurnStarted(1, 0, 7),
            TrackChanged(0, 0, 9, Source.CARD),  # end of turn 1: (9, 0, 0), leader 0
            TurnStarted(1, 1, 7),
            TrackChanged(1, 0, 3, Source.SQUARE),
            TrackChanged(1, 3, 10, Source.CARD),  # end of turn 2: (9, 10, 0), leader 1
            TurnStarted(1, 2, 7),
            TrackChanged(2, 0, 10, Source.CARD),  # end of turn 3: (9, 10, 10), no strict leader
            TurnSkipped(2, 0),
            TrackChanged(2, 10, 15, Source.KUMITE),  # end of turn 4: (9, 10, 15), leader 2
            GameOver(2, 2),
        ],
        players=3,
    )

    assert metrics.lead_changes == 2
    assert metrics.last_lead_change == pytest.approx(4 / 4)
    assert metrics.lead_gap_mean == pytest.approx((9 + 1 + 0 + 5) / 4)
    assert metrics.winner_margin == 5
    assert metrics.winner_lead_share == pytest.approx(1 / 4)
    # Halfway is the end of turn 2, led by player 1.
    assert metrics.halfway_leader_won is False
    assert metrics.contenders_at_end == 0
    # Out (more than 6 behind): players 1 and 2 after turn 1, player 2 after turn 2.
    assert metrics.out_of_contention_share == pytest.approx(3 / 12)
    assert metrics.worst_out_of_contention_share == pytest.approx(0.5)
    # 0>1 becomes 1>0; 0>2 becomes 2>0; 1>2 (ties skipped) becomes 2>1.
    assert metrics.rank_swaps == 3
    assert metrics.winner_turns_to_brown == 1
    assert metrics.final_spread == 6


def test_leader_losing_a_kumite_is_counted() -> None:
    metrics = run(
        [
            TurnStarted(1, 0, 7),
            TrackChanged(0, 0, 3, Source.CARD),
            TurnStarted(1, 1, 7),
            fought(1, 0, FightKind.EQUAL),  # Leader 0 loses.
            fought(1, 0, FightKind.EQUAL, won=False),  # The attacker loses: 0 wins.
            GameOver(None, 1),
        ]
    )

    assert metrics.leader_kumite_losses == 1
    assert metrics.winner_margin is None
    assert metrics.halfway_leader_won is None
    assert metrics.last_lead_change is None


def test_summarize_splits_wins_by_seat_and_bot() -> None:
    base = run([TurnStarted(1, 0, 7), GameOver(None, 10)])
    rows = [
        replace(base, lineup="balanced,random", winner_seat=0, winner_bot="balanced"),
        replace(base, lineup="random,balanced", winner_seat=1, winner_bot="balanced"),
        replace(base, lineup="random,balanced", winner_seat=0, winner_bot="random"),
        base,
    ]

    summary = summarize("test", rows)

    assert summary.finished == 0.75
    assert summary.win_rate_by_seat == (0.5, 0.25)
    assert summary.win_rate_by_bot == {"balanced": 0.5, "random": 0.25}
    assert summary.rounds.median == 10


def test_summarize_needs_games() -> None:
    with pytest.raises(ValueError, match="no games"):
        summarize("test", [])