"""
CS2 規則引擎自動執行條件邏輯測試
==================================
測試範圍：webhooks.py CS2 路徑的 _can_auto 條件判斷邏輯

設計原則:
- 不測試 DB/K8s 端點（屬 integration test 範疇）
- 直接測試 _can_auto 的五個安全條件是否正確
- 從 auto_approve 導入真實的 _DESTRUCTIVE_PATTERNS（不 mock）

安全防線驗證：
1. rule_kubectl 空字串 → False
2. CRITICAL risk → False
3. DESTRUCTIVE_PATTERNS 命中 → False
4. NO_ACTION 在 rule_action → False
5. 全條件滿足 → True

建立：2026-04-27 ogt + Claude Sonnet 4.6 (台北時區)
"""

from src.models.approval import RiskLevel
from src.services.auto_approve import _DESTRUCTIVE_PATTERNS


def _evaluate_can_auto(
    rule_kubectl: str,
    rule_risk: RiskLevel,
    rule_action: str,
) -> bool:
    """
    複製 webhooks.py CS2 路徑的 _can_auto 邏輯，用於單元測試。
    任何修改 webhooks.py 邏輯的人，必須同步更新此函數。
    """
    _destructive_set = set(p.lower() for p in _DESTRUCTIVE_PATTERNS)
    return (
        bool(rule_kubectl)
        and rule_risk != RiskLevel.CRITICAL
        and not any(p in rule_kubectl.lower() for p in _destructive_set)
        and "NO_ACTION" not in rule_action
    )


class TestCS2CanAutoConditions:
    """驗證 CS2 _can_auto 五個安全防線"""

    # ── 正向：全條件滿足 ─────────────────────────────────────────────────

    def test_all_conditions_met_returns_true(self):
        """kubectl 非空 + medium risk + 無破壞性 + 非 NO_ACTION → True"""
        assert _evaluate_can_auto(
            rule_kubectl="kubectl rollout restart deployment/api -n prod",
            rule_risk=RiskLevel.MEDIUM,
            rule_action="重啟 API Deployment | kubectl rollout restart deployment/api -n prod",
        ) is True

    def test_low_risk_returns_true(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl rollout restart deployment/worker -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="重啟 Worker | kubectl rollout restart deployment/worker -n prod",
        ) is True

    # ── 防線 1：kubectl 空字串 ─────────────────────────────────────────────

    def test_empty_kubectl_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="",
            rule_risk=RiskLevel.LOW,
            rule_action="NO_ACTION - 主機記憶體觀察",
        ) is False

    def test_whitespace_only_kubectl_returns_false(self):
        # webhooks.py line 1265: rule_kubectl = str(...).strip()
        # 因此 whitespace-only 在到達 _can_auto 前已被 strip 為空字串
        # 此測試驗證調用方的前置處理行為
        assert _evaluate_can_auto(
            rule_kubectl="",  # strip() 後的結果
            rule_risk=RiskLevel.LOW,
            rule_action="重啟 | 某指令",
        ) is False

    # ── 防線 2：CRITICAL risk ─────────────────────────────────────────────

    def test_critical_risk_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl rollout restart deployment/db -n prod",
            rule_risk=RiskLevel.CRITICAL,
            rule_action="重啟 DB | kubectl rollout restart deployment/db -n prod",
        ) is False

    # ── 防線 3：DESTRUCTIVE_PATTERNS ────────────────────────────────────

    def test_delete_pod_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl delete pod api-xxx-yyy -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="刪除 Pod | kubectl delete pod api-xxx-yyy -n prod",
        ) is False

    def test_delete_pods_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl delete pods --all -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="刪除所有 Pod | kubectl delete pods --all -n prod",
        ) is False

    def test_scale_to_zero_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl scale deployment/api --replicas=0 -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="縮容 | kubectl scale deployment/api --replicas=0",
        ) is False

    def test_kubectl_drain_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl drain node-1 --ignore-daemonsets",
            rule_risk=RiskLevel.MEDIUM,
            rule_action="驅逐節點 | kubectl drain node-1",
        ) is False

    def test_rollout_undo_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl rollout undo deployment/api -n prod",
            rule_risk=RiskLevel.MEDIUM,
            rule_action="回滾 | kubectl rollout undo deployment/api",
        ) is False

    def test_destructive_pattern_case_insensitive(self):
        """大寫 DELETE POD 也必須攔截"""
        assert _evaluate_can_auto(
            rule_kubectl="kubectl DELETE POD api-xxx -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="刪除 | kubectl DELETE POD",
        ) is False

    # ── 防線 4：NO_ACTION ────────────────────────────────────────────────

    def test_no_action_in_action_string_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="kubectl get pods -n prod",
            rule_risk=RiskLevel.LOW,
            rule_action="NO_ACTION - 觀察主機狀態",
        ) is False

    def test_no_action_prefix_returns_false(self):
        assert _evaluate_can_auto(
            rule_kubectl="",
            rule_risk=RiskLevel.LOW,
            rule_action="NO_ACTION - 主機記憶體正常",
        ) is False

    # ── 邊界：_DESTRUCTIVE_PATTERNS 非空 ────────────────────────────────

    def test_destructive_patterns_list_not_empty(self):
        """確保 _DESTRUCTIVE_PATTERNS 未被意外清空"""
        assert len(_DESTRUCTIVE_PATTERNS) > 0

    # ── 組合：多個防線同時觸發 ───────────────────────────────────────────

    def test_critical_and_destructive_both_block(self):
        """CRITICAL + destructive，任一條件都應攔截"""
        assert _evaluate_can_auto(
            rule_kubectl="kubectl delete deployment/api -n prod",
            rule_risk=RiskLevel.CRITICAL,
            rule_action="刪除 Deployment | kubectl delete deployment/api",
        ) is False