#!/usr/bin/env python3
"""
AWOOOI Alert Chain Smoke Test
================================
Wave A.6 (ADR-037): 驗證告警鏈路 E2E 完整性

檢查項目:
  1. API Health — /api/v1/health 全組件 UP
  2. Alert Chain Metric — awoooi_alert_chain_last_success_timestamp 不超過 2h
  3. Webhook 可達性 — /api/v1/webhooks/alertmanager, /signoz, /sentry health
  4. Telegram Secret — K8s Secret 存在且非空
  5. SigNoz 可達 — 192.168.0.188:3301
  6. Prometheus Alertmanager — 192.168.0.188:9093 (可選)

使用方式:
  python3 scripts/alert_chain_smoke_test.py [--api-url URL] [--fail-fast]

CI 整合 (cd.yaml):
  python3 scripts/alert_chain_smoke_test.py \
    --api-url http://localhost:32334 \
    --fail-fast

# Phase O-4.5 2026-04-02 (台北時間)
# 建立者: Claude Code (首席架構師)
"""
from __future__ import annotations

import argparse
import json
import sys
import time
from dataclasses import dataclass, field
from typing import Any

try:
    import requests
except ImportError:
    print("❌ 需要安裝 requests: pip install requests")
    sys.exit(1)

# =============================================================================
# 配置
# =============================================================================
DEFAULT_API_URL = "http://192.168.0.125:32334"
SIGNOZ_URL = "http://192.168.0.188:3301"
ALERTMANAGER_URL = "http://192.168.0.188:9093"
PROMETHEUS_URL = "http://192.168.0.110:9090"

# 告警鏈路最大允許靜默時間 (2 小時)
MAX_ALERT_CHAIN_SILENCE_SECONDS = 2 * 60 * 60

TIMEOUT = 10  # 秒


# =============================================================================
# 測試結果
# =============================================================================
@dataclass
class CheckResult:
    name: str
    passed: bool
    message: str
    critical: bool = True  # critical=False 表示失敗不中斷


@dataclass
class SmokeTestReport:
    checks: list[CheckResult] = field(default_factory=list)
    start_time: float = field(default_factory=time.time)

    def add(self, result: CheckResult) -> None:
        self.checks.append(result)
        icon = "✅" if result.passed else ("❌" if result.critical else "⚠️")
        print(f"  {icon} [{result.name}] {result.message}")

    @property
    def passed(self) -> bool:
        return all(c.passed for c in self.checks if c.critical)

    @property
    def failed_critical(self) -> list[CheckResult]:
        return [c for c in self.checks if not c.passed and c.critical]

    def summary(self) -> str:
        total = len(self.checks)
        passed = sum(1 for c in self.checks if c.passed)
        duration = time.time() - self.start_time
        return f"{passed}/{total} checks passed in {duration:.1f}s"


# =============================================================================
# 檢查函數
# =============================================================================
def check_api_health(api_url: str) -> CheckResult:
    """Check 1: API Health — 所有組件必須 UP"""
    try:
        resp = requests.get(f"{api_url}/api/v1/health", timeout=TIMEOUT)
        data = resp.json()

        if data.get("status") != "healthy":
            return CheckResult(
                "API Health",
                False,
                f"API status={data.get('status')} (expected healthy)",
            )

        # 檢查每個組件
        components = data.get("components", {})
        down_components = [
            name for name, info in components.items()
            if info.get("status") != "up"
        ]

        if down_components:
            return CheckResult(
                "API Health",
                False,
                f"組件異常: {', '.join(down_components)}",
            )

        return CheckResult(
            "API Health",
            True,
            f"所有 {len(components)} 個組件 UP ({data.get('environment', 'unknown')})",
        )
    except requests.RequestException as e:
        return CheckResult("API Health", False, f"無法連線: {e}")


def check_alert_chain_metric(prometheus_url: str) -> CheckResult:
    """Check 2: 告警鏈路最後成功時間不超過 2 小時"""
    try:
        resp = requests.get(
            f"{prometheus_url}/api/v1/query",
            params={"query": "awoooi_alert_chain_last_success_timestamp"},
            timeout=TIMEOUT,
        )
        data = resp.json()
        results = data.get("data", {}).get("result", [])

        if not results:
            return CheckResult(
                "Alert Chain Metric",
                False,
                "awoooi_alert_chain_last_success_timestamp 指標不存在 (Prometheus 未抓到)",
                critical=False,  # 指標可能剛啟動
            )

        last_success = float(results[0]["value"][1])
        age_seconds = time.time() - last_success
        age_minutes = age_seconds / 60

        if age_seconds > MAX_ALERT_CHAIN_SILENCE_SECONDS:
            return CheckResult(
                "Alert Chain Metric",
                False,
                f"告警鏈路已靜默 {age_minutes:.0f} 分鐘 (超過 120 分鐘閾值)",
            )

        return CheckResult(
            "Alert Chain Metric",
            True,
            f"最後告警成功: {age_minutes:.0f} 分鐘前",
        )
    except requests.RequestException as e:
        return CheckResult(
            "Alert Chain Metric", False, f"無法查詢 Prometheus: {e}", critical=False
        )


def check_webhook_health(api_url: str) -> list[CheckResult]:
    """Check 3: 所有 Webhook Health Endpoint"""
    results = []
    webhooks = [
        ("Alertmanager Webhook", f"{api_url}/api/v1/webhooks/health"),
        ("SignOz Webhook", f"{api_url}/api/v1/webhooks/signoz/health"),
        ("Sentry Webhook", f"{api_url}/api/v1/webhooks/sentry/health"),
    ]

    for name, url in webhooks:
        try:
            resp = requests.get(url, timeout=TIMEOUT)
            if resp.status_code == 200:
                results.append(CheckResult(name, True, f"HTTP 200 OK"))
            else:
                results.append(
                    CheckResult(name, False, f"HTTP {resp.status_code}")
                )
        except requests.RequestException as e:
            results.append(CheckResult(name, False, f"無法連線: {e}"))

    return results


def check_signoz_reachable(signoz_url: str) -> CheckResult:
    """Check 4: SigNoz UI 可達"""
    try:
        resp = requests.get(signoz_url, timeout=TIMEOUT)
        # SigNoz UI 通常回 200 或 301/302
        if resp.status_code < 400:
            return CheckResult("SigNoz", True, f"HTTP {resp.status_code}")
        return CheckResult("SigNoz", False, f"HTTP {resp.status_code}", critical=False)
    except requests.RequestException as e:
        return CheckResult("SigNoz", False, f"無法連線: {e}", critical=False)


def check_otel_collector() -> CheckResult:
    """Check 5: OTEL Collector DaemonSet 是否在 K3s 運行"""
    try:
        import subprocess
        result = subprocess.run(
            ["kubectl", "get", "pods", "-n", "observability",
             "-l", "app.kubernetes.io/name=otel-collector",
             "--no-headers", "-o", "custom-columns=STATUS:.status.phase"],
            capture_output=True, text=True, timeout=15
        )
        if result.returncode != 0:
            return CheckResult(
                "OTEL Collector", False, "kubectl 查詢失敗", critical=False
            )

        statuses = result.stdout.strip().split("\n")
        running = [s for s in statuses if s.strip() == "Running"]

        if len(running) == 0:
            return CheckResult(
                "OTEL Collector", False, "沒有 Running 的 OTEL Collector Pod"
            )

        return CheckResult(
            "OTEL Collector", True, f"{len(running)} Pod(s) Running"
        )
    except Exception as e:
        return CheckResult(
            "OTEL Collector", False, f"無法檢查: {e}", critical=False
        )


def check_event_exporter() -> CheckResult:
    """Check 6: Event Exporter 是否在 K3s 運行"""
    try:
        import subprocess
        result = subprocess.run(
            ["kubectl", "get", "pods", "-n", "observability",
             "-l", "app.kubernetes.io/name=event-exporter",
             "--no-headers", "-o", "custom-columns=STATUS:.status.phase"],
            capture_output=True, text=True, timeout=15
        )
        if result.returncode != 0:
            return CheckResult(
                "Event Exporter", False, "kubectl 查詢失敗", critical=False
            )

        statuses = result.stdout.strip().split("\n")
        running = [s for s in statuses if s.strip() == "Running"]

        if len(running) == 0:
            return CheckResult(
                "Event Exporter", False, "沒有 Running 的 Event Exporter Pod"
            )

        return CheckResult("Event Exporter", True, f"{len(running)} Pod(s) Running")
    except Exception as e:
        return CheckResult(
            "Event Exporter", False, f"無法檢查: {e}", critical=False
        )


# =============================================================================
# 主程式
# =============================================================================
def run_smoke_test(api_url: str, fail_fast: bool = False) -> SmokeTestReport:
    report = SmokeTestReport()

    print(f"\n🔍 AWOOOI Alert Chain Smoke Test")
    print(f"   API: {api_url}")
    print(f"   時間: {time.strftime('%Y-%m-%d %H:%M:%S %Z')}")
    print("-" * 50)

    # Check 1: API Health
    report.add(check_api_health(api_url))
    if fail_fast and not report.passed:
        return report

    # Check 2: Alert Chain Metric
    report.add(check_alert_chain_metric(PROMETHEUS_URL))

    # Check 3: Webhook Health
    for result in check_webhook_health(api_url):
        report.add(result)
        if fail_fast and not result.passed and result.critical:
            return report

    # Check 4: SigNoz
    report.add(check_signoz_reachable(SIGNOZ_URL))

    # Check 5: OTEL Collector
    report.add(check_otel_collector())

    # Check 6: Event Exporter
    report.add(check_event_exporter())

    return report


def main() -> int:
    parser = argparse.ArgumentParser(description="AWOOOI Alert Chain Smoke Test")
    parser.add_argument(
        "--api-url", default=DEFAULT_API_URL, help="API base URL"
    )
    parser.add_argument(
        "--fail-fast", action="store_true", help="第一個 critical 失敗即中止"
    )
    parser.add_argument(
        "--json", action="store_true", help="輸出 JSON 格式結果"
    )
    args = parser.parse_args()

    report = run_smoke_test(args.api_url, args.fail_fast)

    print("-" * 50)
    if report.passed:
        print(f"✅ PASSED — {report.summary()}")
    else:
        print(f"❌ FAILED — {report.summary()}")
        if report.failed_critical:
            print("\n失敗的 Critical 檢查:")
            for c in report.failed_critical:
                print(f"  - [{c.name}] {c.message}")

    if args.json:
        output = {
            "passed": report.passed,
            "summary": report.summary(),
            "checks": [
                {
                    "name": c.name,
                    "passed": c.passed,
                    "message": c.message,
                    "critical": c.critical,
                }
                for c in report.checks
            ],
        }
        print("\n" + json.dumps(output, ensure_ascii=False, indent=2))

    return 0 if report.passed else 1


if __name__ == "__main__":
    sys.exit(main())