"""Tests for conflict detector."""
import pytest
from rule_engine.conflict import ConflictDetector


@pytest.fixture
def detector():
    return ConflictDetector()


def test_no_conflict_different_actions(detector):
    """验证不同动作的规则不冲突。"""
    rules = [
        {"id": "r1", "name": "rule1", "code": 'def rule(f):\n    if f.get("a") == 1:\n        return {"action": "allow"}\n    return None', "priority": 1, "is_active": True},
        {"id": "r2", "name": "rule2", "code": 'def rule(f):\n    if f.get("b") == 1:\n        return {"action": "discount"}\n    return None', "priority": 1, "is_active": True},
    ]
    conflicts = detector.detect_conflicts(rules)
    assert len(conflicts) == 0


def test_conflict_opposite_actions_same_priority(detector):
    """验证优先级相同的相反动作规则冲突。"""
    rules = [
        {"id": "r1", "name": "allow_rule", "code": 'def rule(f):\n    if f.get("type") == "vip":\n        return {"action": "allow"}\n    return None', "priority": 1, "is_active": True},
        {"id": "r2", "name": "deny_rule", "code": 'def rule(f):\n    if f.get("type") == "vip":\n        return {"action": "deny"}\n    return None', "priority": 1, "is_active": True},
    ]
    conflicts = detector.detect_conflicts(rules)
    assert len(conflicts) == 1
    assert conflicts[0]["requires_resolution"] is True


def test_no_conflict_different_priority(detector):
    """验证优先级不同的规则不冲突（高优先级覆盖低优先级）。"""
    rules = [
        {"id": "r1", "name": "allow_rule", "code": 'def rule(f):\n    if f.get("type") == "vip":\n        return {"action": "allow"}\n    return None', "priority": 2, "is_active": True},
        {"id": "r2", "name": "deny_rule", "code": 'def rule(f):\n    if f.get("type") == "vip":\n        return {"action": "deny"}\n    return None', "priority": 1, "is_active": True},
    ]
    conflicts = detector.detect_conflicts(rules)
    assert len(conflicts) == 0


def test_conflict_inactive_rules_ignored(detector):
    """验证非活跃规则不参与冲突检测。"""
    rules = [
        {"id": "r1", "name": "allow_rule", "code": 'def rule(f):\n    return {"action": "allow"}', "priority": 1, "is_active": True},
        {"id": "r2", "name": "deny_rule", "code": 'def rule(f):\n    return {"action": "deny"}', "priority": 1, "is_active": False},
    ]
    conflicts = detector.detect_conflicts(rules)
    assert len(conflicts) == 0


def test_check_rule_with_existing(detector):
    """验证新规则与现有规则检查。"""
    existing = [
        {"id": "r1", "name": "allow", "code": 'def rule(f):\n    return {"action": "allow"}', "priority": 1, "is_active": True},
    ]
    new_rule = {"id": "r2", "name": "deny", "code": 'def rule(f):\n    return {"action": "deny"}', "priority": 1, "is_active": True}
    conflicts = detector.check_rule_with_existing(new_rule, existing)
    assert len(conflicts) == 1


def test_extract_returns(detector):
    """验证返回值提取。"""
    code = 'def rule(f):\n    if f.get("x"):\n        return {"action": "allow"}\n    return None'
    returns = detector._extract_returns(code)
    assert len(returns) == 2


def test_has_opposite_actions(detector):
    """验证相反动作检测。"""
    assert detector._has_opposite_actions(['"allow"', '"ok"'], ['"deny"']) is True
    assert detector._has_opposite_actions(['"allow"'], ['"allow"']) is False
    assert detector._has_opposite_actions(['"discount"'], ['"None"']) is False