"""
Core Constants
==============
ADR-027: Incident-Approval 同步架構

統一定義系統常量，避免散落各處的 magic numbers。

版本: v1.0
建立: 2026-03-26 (台北時區)
"""

# =============================================================================
# TTL Settings (秒)
# =============================================================================

# Working Memory TTL: 7 天
INCIDENT_TTL_SECONDS = 7 * 24 * 3600  # 604800
APPROVAL_TTL_SECONDS = 7 * 24 * 3600  # 604800

# Decision Token TTL: 24 小時
DECISION_TTL_SECONDS = 24 * 3600  # 86400

# =============================================================================
# Redis Key Prefixes
# =============================================================================

REDIS_KEY_INCIDENT = "incident:"
REDIS_KEY_APPROVAL = "approval:"
REDIS_KEY_PENDING = "pending_approvals"
REDIS_KEY_DECISION = "decision:"

# =============================================================================
# Status Mappings (ADR-027)
# =============================================================================

# Approval 狀態 → Incident 狀態
APPROVAL_TO_INCIDENT_STATUS = {
    "pending": "investigating",
    "approved": "resolved",
    "rejected": "escalated",
    "expired": "escalated",
}

# Incident 狀態 → 是否活躍
INCIDENT_ACTIVE_STATUSES = frozenset({"investigating", "mitigating"})

# =============================================================================
# Terminal Service Settings (Phase 19.4 P1)
# 2026-03-30 Claude Code: 首席架構師審查 - 常數提取
# =============================================================================

# SSE 事件間隔 (秒) - 避免前端過載
SSE_DELAY_SECONDS = 0.3

# Approval 清單顯示上限
MAX_APPROVAL_DISPLAY = 5

# 錯誤訊息截斷長度 (安全性)
ERROR_MESSAGE_MAX_LENGTH = 100
ERROR_MESSAGE_DISPLAY_LENGTH = 50

# =============================================================================
# CI/CD Alert Detection (2026-03-30 P1 配置化)
# =============================================================================

# CI/CD 告警 alertname 前綴
CICD_ALERT_PREFIXES = (
    "CD_",
    "CI_",
    "E2E_",
    "SmokeTest",
    "Build_",
    "Test_",
    "Deploy_",
)

# CI/CD 告警 alertname 後綴
CICD_ALERT_SUFFIXES = (
    "_Build",
    "_Test",
    "_Deploy",
    "_E2E",
)

# CI/CD 告警關鍵字 (不區分大小寫)
CICD_ALERT_KEYWORDS = ("CI/CD", "cicd")

# =============================================================================
# Heartbeat/Watchdog Alert Detection (2026-04-10 Claude Sonnet 4.6 Asia/Taipei)
# 心跳/看門狗告警不觸發自動修復飛輪 — 這類告警代表監控系統狀態，不是服務故障
# =============================================================================
HEARTBEAT_ALERT_NAMES = frozenset({
    "Watchdog",
    "DeadMansSwitch",
    "NoAlertsReceived",
    "NoAlertsReceived2Hours",
    "AlertmanagerDown",
    "PrometheusNotConnectedToAlertmanager",
})

HEARTBEAT_ALERT_KEYWORDS = ("NoAlertsReceived", "Watchdog", "DeadMansSwitch", "Heartbeat")


def is_heartbeat_alertname(alertname: str) -> bool:
    """
    判斷 alertname 是否為心跳/看門狗告警

    心跳告警代表監控系統自身健康狀態，不是服務故障，
    不應進入自動修復飛輪（不存在對應的 Playbook 修復動作）。
    """
    return (
        alertname in HEARTBEAT_ALERT_NAMES
        or any(kw in alertname for kw in HEARTBEAT_ALERT_KEYWORDS)
    )


def is_cicd_alertname(alertname: str) -> bool:
    """
    判斷 alertname 是否為 CI/CD 告警

    Args:
        alertname: Alertmanager alertname 標籤值

    Returns:
        True 如果是 CI/CD 告警
    """
    return (
        alertname.startswith(CICD_ALERT_PREFIXES)
        or alertname.endswith(CICD_ALERT_SUFFIXES)
        or any(kw in alertname for kw in CICD_ALERT_KEYWORDS)
        or "cicd" in alertname.lower()
    )


def sanitize_error_message(error: str, max_length: int = ERROR_MESSAGE_MAX_LENGTH) -> str:
    """
    安全化錯誤訊息 - 截斷並移除敏感資訊

    2026-03-30 Claude Code: 首席架構師審查 - 錯誤訊息安全化

    Args:
        error: 原始錯誤訊息
        max_length: 最大長度 (預設 100)

    Returns:
        安全化後的錯誤訊息
    """
    if not error:
        return "Unknown error"

    # 移除可能的敏感資訊模式
    sensitive_patterns = [
        "password",
        "token",
        "secret",
        "api_key",
        "apikey",
        "credential",
        "bearer",
    ]

    sanitized = error
    for pattern in sensitive_patterns:
        # 不區分大小寫替換
        import re
        sanitized = re.sub(
            rf"({pattern})\s*[:=]\s*\S+",
            f"{pattern}=[REDACTED]",
            sanitized,
            flags=re.IGNORECASE,
        )

    # 截斷
    if len(sanitized) > max_length:
        return sanitized[:max_length - 3] + "..."

    return sanitized