"""
P0 #3 K8s pod state machine 測試
2026-05-03 Claude Opus 4.7 + 統帥 ogt

驗證 _build_warnings() 對 5 種 K8s pod phase 的判斷邏輯：
  Pending — 短暫 OK，>5min 警告
  Running — ready=True OK；ready=False 短暫 OK，>2min 警告
  Succeeded/Completed — CronJob 跑完，跳過（不算未就緒）
  Failed — 必告警
  Unknown — 必告警
  restarts >= 3 — 必告警（無關 phase）

加 test 同時保護未來重構不誤砍 K8s lifecycle 處理。
"""
from datetime import datetime, timedelta, timezone

import pytest

from src.services.heartbeat_report_service import (
    HeartbeatReport,
    HeartbeatReportService,
    PodInfo,
)


def _make_report(pods: list[PodInfo]) -> HeartbeatReport:
    """構造最小 HeartbeatReport，只填 pods 欄位"""
    return HeartbeatReport(
        timestamp=datetime.now(timezone.utc),
        pods=pods,
    )


def _start_time(minutes_ago: int) -> str:
    """構造 N 分鐘前的 ISO 8601 startTime（K8s 格式）"""
    dt = datetime.now(timezone.utc) - timedelta(minutes=minutes_ago)
    return dt.strftime("%Y-%m-%dT%H:%M:%SZ")


class TestPodStateMachine:
    """K8s pod phase 完整 state machine 覆蓋"""

    def setup_method(self):
        self.svc = HeartbeatReportService()

    # --- Succeeded / Completed: CronJob 跑完，不算未就緒 ---

    def test_succeeded_pod_no_warning(self):
        pod = PodInfo(name="drift-scanner-abc", ready=False, status="Succeeded")
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert not any("drift-scanner" in w for w in warnings), \
            f"Succeeded pod 不該被當未就緒，實際 warnings: {warnings}"

    def test_completed_pod_no_warning(self):
        pod = PodInfo(name="job-xyz", ready=False, status="Completed")
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert not any("job-xyz" in w for w in warnings)

    # --- Failed: 必告警 ---

    def test_failed_pod_warns(self):
        pod = PodInfo(name="api-bad", ready=False, status="Failed")
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-bad" in w and "Failed" in w for w in warnings), \
            f"Failed pod 必告警，實際 warnings: {warnings}"

    # --- Unknown: 必告警 ---

    def test_unknown_pod_warns(self):
        pod = PodInfo(name="api-unknown", ready=False, status="Unknown")
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-unknown" in w and "Unknown" in w for w in warnings)

    # --- Pending: 短暫 OK，>5min 警告 ---

    def test_pending_short_no_warning(self):
        # 剛建立 1 分鐘的 Pending pod 不該告警
        pod = PodInfo(
            name="api-starting", ready=False, status="Pending",
            start_time=_start_time(minutes_ago=1),
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert not any("api-starting" in w for w in warnings), \
            f"Pending <5min 不該告警，實際: {warnings}"

    def test_pending_long_warns(self):
        # Pending 10 分鐘 → image pull / scheduling 卡住
        pod = PodInfo(
            name="api-stuck", ready=False, status="Pending",
            start_time=_start_time(minutes_ago=10),
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-stuck" in w and "Pending" in w for w in warnings), \
            f"Pending >5min 必告警，實際: {warnings}"

    def test_pending_no_starttime_warns(self):
        # 拿不到 start_time 時保守告警
        pod = PodInfo(
            name="api-no-time", ready=False, status="Pending",
            start_time=None,
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-no-time" in w for w in warnings)

    # --- Running ready=True: 健康，跳過 ---

    def test_running_ready_no_warning(self):
        pod = PodInfo(
            name="api-healthy", ready=True, status="Running",
            start_time=_start_time(minutes_ago=60),
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert not any("api-healthy" in w for w in warnings), \
            f"Running+Ready 不該告警，實際: {warnings}"

    # --- Running ready=False: 短暫 OK，>2min 警告 ---

    def test_running_not_ready_short_no_warning(self):
        # Running 但 not ready 1 分鐘（剛起來，probe 還沒過）
        pod = PodInfo(
            name="api-warming", ready=False, status="Running",
            start_time=_start_time(minutes_ago=1),
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert not any("api-warming" in w for w in warnings), \
            f"Running NotReady <2min 不該告警，實際: {warnings}"

    def test_running_not_ready_long_warns(self):
        # Running 但 not ready 5 分鐘 → readiness probe fail
        pod = PodInfo(
            name="api-stale", ready=False, status="Running",
            start_time=_start_time(minutes_ago=5),
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-stale" in w and "NotReady" in w for w in warnings), \
            f"Running NotReady >2min 必告警，實際: {warnings}"

    # --- restarts >= 3: 必告警，無關 phase ---

    def test_high_restarts_warns_even_if_running(self):
        pod = PodInfo(
            name="api-flaky", ready=True, status="Running",
            start_time=_start_time(minutes_ago=30), restarts=5,
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("api-flaky" in w and "重啟" in w for w in warnings)

    def test_high_restarts_warns_for_succeeded_pod(self):
        # 即使 Succeeded 也應該因為 restart 過多而告警（CrashLoop 跑完）
        pod = PodInfo(
            name="job-crashy", ready=False, status="Succeeded", restarts=10,
        )
        warnings = self.svc._build_warnings(_make_report([pod]))
        assert any("job-crashy" in w and "重啟" in w for w in warnings)


class TestRegression:
    """Regression：保護 daily report 不再出現 24h 連續同樣 false positive"""

    def setup_method(self):
        self.svc = HeartbeatReportService()

    def test_3_drift_scanner_succeeded_pods_zero_warning(self):
        """2026-05-02 統帥截圖鐵證：3 個 drift-scanner Succeeded pod 每天造成
        「需關注 3 項」假警報。修復後同樣 fixture 應 0 warning。"""
        pods = [
            PodInfo(name=f"drift-scanner-{i}-pvbst", ready=False, status="Succeeded")
            for i in range(3)
        ]
        warnings = self.svc._build_warnings(_make_report(pods))
        assert not any("drift-scanner" in w for w in warnings), \
            f"Codex stash + 我的修法後 Succeeded CronJob pod 不該告警，實際: {warnings}"