"""service 层纯逻辑：状态机矩阵、DSL 写入校验、ORM 行 → 域规则转换。

不连库——DB 路径由 tests/integration/test_rules_engine.py 覆盖。
"""

from __future__ import annotations

from decimal import Decimal

import pytest

from packages.rules import service
from packages.shared.errors import AppError, ErrorCode
from packages.shared.models import KbRule

VALID_PAYLOAD = {
    "rule_key": "R-TEST-001",
    "category": "body_shape",
    "priority": 90,
    "conditions": {"body_shape": "A型"},
    "effects": {
        "recommend": [{"slot": "top", "attrs": {"shoulder": ["垫肩"]}}],
        "avoid": [{"slot": "top", "attrs": {"shoulder": ["落肩"]}}],
        "explanation": "测试规则",
    },
    "is_hard": False,
    "confidence": 0.95,
}

ALL_STATUSES = ("draft", "published", "archived")


# ── 状态机全跃迁矩阵 ───────────────────────────────────────────────────────


def test_legal_transitions_accepted() -> None:
    for current, target in (
        ("draft", "published"),  # 发布
        ("published", "archived"),  # 下线
        ("draft", "archived"),  # 撤稿
    ):
        service.ensure_transition(current, target)  # 不抛即通过


@pytest.mark.parametrize("current", ALL_STATUSES)
@pytest.mark.parametrize("target", ALL_STATUSES)
def test_illegal_transitions_rejected(current: str, target: str) -> None:
    if (current, target) in service.LEGAL_TRANSITIONS:
        pytest.skip("合法跃迁另测")
    with pytest.raises(AppError) as excinfo:
        service.ensure_transition(current, target)
    assert excinfo.value.code == ErrorCode.STATE_CONFLICT
    assert excinfo.value.data == {"current": current, "target": target}


# ── DSL 写入校验 ───────────────────────────────────────────────────────────


def test_validate_rule_payload_accepts_valid_dsl() -> None:
    rule = service.validate_rule_payload(VALID_PAYLOAD)
    assert rule.rule_key == "R-TEST-001"


def test_validate_rule_payload_rejects_unknown_keys_with_details() -> None:
    with pytest.raises(AppError) as excinfo:
        service.validate_rule_payload({**VALID_PAYLOAD, "conclusions": []})
    assert excinfo.value.code == ErrorCode.VALIDATION_FAILED
    assert excinfo.value.data["errors"]  # 拒绝原因必须可读，不能只说"不合法"
    assert any("conclusions" in err for err in excinfo.value.data["errors"])


def test_validate_rule_payload_rejects_unknown_condition_field() -> None:
    with pytest.raises(AppError) as excinfo:
        service.validate_rule_payload({**VALID_PAYLOAD, "conditions": {"body_shap": "A型"}})
    assert excinfo.value.code == ErrorCode.VALIDATION_FAILED


# ── ORM 行 → 域规则 ────────────────────────────────────────────────────────


def _row(**overrides: object) -> KbRule:
    values: dict[str, object] = {
        "rule_id": 1,
        "rule_key": "R-ROW-001",
        "category": "body_shape",
        "version": 1,
        "status": "published",
        "priority": 90,
        "conditions": {"body_shape": "A型"},
        "effects": {
            "recommend": [{"slot": "top", "attrs": {"shoulder": ["垫肩"]}}],
            "explanation": "行转换",
        },
        "is_hard": False,
        "confidence": Decimal("0.950"),
    }
    values.update(overrides)
    return KbRule(**values)  # type: ignore[arg-type]


def test_row_to_rule_parses_stored_jsonb() -> None:
    rule = service.row_to_rule(_row())
    assert rule.rule_key == "R-ROW-001"
    assert rule.confidence == pytest.approx(0.95)  # Numeric(4,3) → float
    assert rule.conditions.clauses["body_shape"] == "A型"
    assert rule.effects.recommend[0].attrs["shoulder"] == ("垫肩",)


def test_row_to_rule_rejects_corrupted_stored_dsl() -> None:
    # 库里数据坏了是 5xxxx 知识库数据错误，必须响亮失败而不是静默跳过
    with pytest.raises(AppError) as excinfo:
        service.row_to_rule(_row(conditions={"mood": "开心"}))
    assert excinfo.value.code == ErrorCode.CONFIG_ERROR
    assert excinfo.value.data == {"rule_key": "R-ROW-001"}


def test_published_rules_cache_invalidate_resets() -> None:
    cache = service.PublishedRules()
    assert cache._rules is None
    cache._rules = ()
    cache.invalidate()
    assert cache._rules is None