"""M2 결정적 리딩 루프 회귀 테스트 — LLM 없이 전체 서사가 코드만으로 돈다."""

import pytest

from engine.repositories.content import ContentError, ContentRepository
from engine.services.state import HiddenState
from engine.services.story import StoryEngine, eval_condition


@pytest.fixture(scope="module")
def repo():
    return ContentRepository("content")


def play(repo, policy: str) -> StoryEngine:
    engine = StoryEngine(repo)
    step = engine.start()
    while step.ending is None:
        if step.choices:
            idx = next((i for i, c in enumerate(step.choices) if c.axis == policy),
                       next((i for i, c in enumerate(step.choices)
                             if c.axis in (None, "neutral")), 0))
            _, step = engine.choose(idx)
        else:
            step = engine.advance()
    return engine


# ── 엔딩 3종 도달 (수렴 회귀의 핵심) ─────────────────────────
def test_trust_policy_reaches_eternal(repo):
    e = play(repo, "trust")
    assert e.ending.id == "ending_eternal"


def test_doubt_policy_reaches_reckoning(repo):
    e = play(repo, "doubt")
    assert e.ending.id == "ending_reckoning"
    assert e.ending.canonical  # 처단이 원작 캐논


def test_neutral_policy_reaches_release(repo):
    e = play(repo, "neutral")
    assert e.ending.id == "ending_release"


# ── 캐논 보장 ────────────────────────────────────────────────
def test_reach_point_visited_on_every_policy(repo):
    """E06-10(두 점 발견)은 어떤 성향이든 반드시 도달 (헌법 0번)."""
    for policy in ("trust", "doubt", "neutral"):
        e = play(repo, policy)
        assert "E06-10" in e.visited, policy
        assert e.state.frailty >= 1  # 쇠약도는 신뢰와 무관하게 진행


def test_awareness_established_at_entry(repo):
    e = StoryEngine(repo)
    e.start()
    assert e.state.awareness_established  # 엔진 A: 도입 1회 확립


def test_trust_path_commits_hidden_branch(repo):
    """E06-09 동조(신뢰) → 도달점 통과 후 E06-10C(숨김) 분기가 예약된다."""
    e = play(repo, "trust")
    assert "E06-10C" in e.visited
    assert "E06-10B" not in e.visited


# ── 숨은 상태 규칙 ───────────────────────────────────────────
def test_frailty_is_monotonic():
    s = HiddenState()
    s.advance_frailty()
    with pytest.raises(ValueError):
        s.advance_frailty(-1)


def test_trust_levels():
    s = HiddenState()
    assert s.trust_level == "neutral"
    s.trust_score = 40
    assert s.trust_level == "trust_high" and s.deep_unlock
    s.doubt_score = 80
    assert s.trust_level == "doubt_high"


def test_condition_parser_rejects_arbitrary_code():
    s = HiddenState()
    assert eval_condition("default", s)
    assert not eval_condition("doubt_score >= 30", s)
    s.doubt_score = 30
    assert eval_condition("doubt_score >= 30", s)
    with pytest.raises(ValueError):
        eval_condition("__import__('os')", s)


# ── 스포일러 필터 ────────────────────────────────────────────
def test_spoiler_filter_blocks_future_cards(repo):
    with pytest.raises(ContentError):
        repo.get_card("E06-10", current_id="E01-01")
    assert repo.get_card("E01-01", current_id="E06-10").id == "E01-01"


def test_deep_gate_hidden_until_trust_high(repo):
    """E06-09 심층 고백(엔진 D)은 신뢰高에서만 노출."""
    card = repo.get_card("E06-09")
    gated = [b for b in card.narration if b.gate == "trust_high"]
    assert gated, "E06-09에 심층 게이트 블록이 있어야 함"

    cold = StoryEngine(repo)
    cold.current_id = "E06-09"
    assert all(b.gate == "all" for b in cold.visible_narration(card))

    warm = StoryEngine(repo, HiddenState(trust_score=60))
    assert any(b.gate == "trust_high" for b in warm.visible_narration(card))