# apps/api/tests/test_ai_router_failover_integration.py | 2026-04-25 @ Asia/Taipei
# 2026-04-25 P1.2 by Claude Engineer-A2 — failover 整合到 ai_router + lifespan
# 2026-04-26 Wave4 P1.2-tests-fix by Claude Engineer-A3 — 修正 intent mock：ALERT_TRIAGE→DIAGNOSE（normalize_intent 映射），改用 UNKNOWN（無 override，score=1 → OLLAMA → failover 觸發）
# 2026-04-26 Wave4 P1.2-tests-fix-v2 by Claude Opus 4.7 — UNKNOWN intent 在 router 內仍被 reclassify 成 DIAGNOSE → openclaw_nemo
#   改用 patch.object(router, "_select_provider_and_model") 直接強制初始路由為 OLLAMA，繞過 normalize / alert detection 邏輯
# 2026-05-03 ogt: ADR-110 GCP 三層容災，_make_health host 更新為 GCP-A Primary
"""
AIRouter × OllamaFailoverManager 整合測試
==========================================
測試覆蓋：
1. 初步路由選 OLLAMA → failover_manager 重評 → decision 使用 failover 結果
2. failover 回傳 GEMINI primary → decision.selected_provider == GEMINI
3. failover 的 fallback_chain 正確轉換到 decision.fallback_chain
4. 初步路由選 NEMOTRON → failover_manager 不被呼叫
5. 初步路由選 OPENCLAW_NEMO → failover_manager 不被呼叫
6. failover_manager 發生例外 → fail-open，保留原始 provider

測試分類：unit（mock OllamaFailoverManager，無 Redis / DB 依賴）
"""

from __future__ import annotations

from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from src.services.ai_router import AIProviderEnum, AIRouter, reset_ai_router
from src.services.ollama_failover_manager import OllamaEndpoint, OllamaRoutingResult
from src.services.ollama_health_monitor import HealthReport, HealthStatus


# =============================================================================
# Fixtures / Helpers
# =============================================================================


@pytest.fixture(autouse=True)
def reset_router_singleton():
    """每個測試前後重置 AIRouter singleton，避免 failover_manager mock 殘留"""
    yield
    reset_ai_router()


def _make_health(status: HealthStatus) -> HealthReport:
    return HealthReport(status=status, host="http://34.143.170.20:11434", latency_ms=500.0)  # GCP-A Primary（ADR-110）


def _make_failover_result(
    primary_provider: str,
    primary_model: str,
    fallback: list[tuple[str, str]] | None = None,
) -> OllamaRoutingResult:
    """建立 OllamaRoutingResult 測試物件"""
    fb_endpoints = [
        OllamaEndpoint(url="", provider_name=p, model=m)
        for p, m in (fallback or [])
    ]
    return OllamaRoutingResult(
        primary=OllamaEndpoint(url="", provider_name=primary_provider, model=primary_model),
        fallback_chain=fb_endpoints,
        routing_reason=f"test: {primary_provider}",
        health_gcp_a=_make_health(HealthStatus.OFFLINE),  # ADR-110：欄位改為 health_gcp_a
    )


def _make_router_with_mock_failover(mock_failover_manager) -> AIRouter:
    """建立 AIRouter，並替換其 _failover_manager"""
    router = AIRouter()
    router._failover_manager = mock_failover_manager
    return router


# =============================================================================
# Test 1: OLLAMA 路由 → failover_manager 重評 → 使用 GEMINI
# =============================================================================


@pytest.mark.asyncio
async def test_router_uses_failover_when_ollama_initial_provider():
    """初步路由選 OLLAMA → 應走 failover_manager 重評，decision.selected_provider == GEMINI"""
    mock_fm = MagicMock()
    mock_fm.select_provider = AsyncMock(
        return_value=_make_failover_result(
            primary_provider="gemini",
            primary_model="gemini-1.5-flash",
            fallback=[("ollama_local", "qwen2.5:7b-instruct"), ("nemotron", "nvidia/nemotron-mini-4b-instruct")],
        )
    )

    router = _make_router_with_mock_failover(mock_fm)

    # 2026-04-26 Wave4 v2 by Claude Opus 4.7 — 直接 mock _select_provider_and_model 強制初始 OLLAMA
    with patch.object(
        router,
        "_select_provider_and_model",
        return_value=(AIProviderEnum.OLLAMA, "qwen3:8b", "test forced ollama"),
    ):
        decision = await router.route("test alert message")

    assert decision.selected_provider == AIProviderEnum.GEMINI
    assert decision.selected_model == "gemini-1.5-flash"
    mock_fm.select_provider.assert_awaited_once()


# =============================================================================
# Test 2: fallback_chain 正確轉換
# =============================================================================


@pytest.mark.asyncio
async def test_router_failover_fallback_chain_converted():
    """failover_manager 回傳 fallback_chain → decision.fallback_chain 包含 OLLAMA_LOCAL"""
    mock_fm = MagicMock()
    mock_fm.select_provider = AsyncMock(
        return_value=_make_failover_result(
            primary_provider="gemini",
            primary_model="gemini-1.5-flash",
            fallback=[
                ("ollama_local", "qwen2.5:7b-instruct"),
                ("nemotron", "nvidia/nemotron-mini-4b-instruct"),
                ("claude", "claude-haiku-4-5-20251001"),
            ],
        )
    )

    router = _make_router_with_mock_failover(mock_fm)

    # 2026-04-26 Wave4 v2 by Claude Opus 4.7 — 直接 mock _select_provider_and_model 強制初始 OLLAMA
    with patch.object(
        router,
        "_select_provider_and_model",
        return_value=(AIProviderEnum.OLLAMA, "qwen3:8b", "test forced ollama"),
    ):
        decision = await router.route("test alert message")

    fb_providers = [p for p, _ in decision.fallback_chain]
    assert AIProviderEnum.OLLAMA_LOCAL in fb_providers, (
        f"OLLAMA_LOCAL not in fallback_chain: {fb_providers}"
    )
    assert AIProviderEnum.NEMOTRON in fb_providers
    assert AIProviderEnum.CLAUDE in fb_providers


# =============================================================================
# Test 3: NEMOTRON 路由 → failover_manager 不被呼叫
# =============================================================================


@pytest.mark.asyncio
async def test_router_does_not_use_failover_for_nemotron():
    """初步路由選 NEMOTRON（tool_calling）→ failover_manager.select_provider 不應被呼叫"""
    mock_fm = MagicMock()
    mock_fm.select_provider = AsyncMock()

    router = _make_router_with_mock_failover(mock_fm)

    # 強制 intent = DIAGNOSE（→ OPENCLAW_NEMO），再用 context_hint 跳過 LLM
    # 但 NEMOTRON 只由 route_tool_calling() 觸發，route() 最多到 OPENCLAW_NEMO
    # 改用 QUERY → OLLAMA 的 override，然後驗 failover 被觸發（這不是 NEMOTRON 測試）
    # 正確測試：強制 CRITICAL → CLAUDE，驗 failover 不被呼叫
    with patch.object(router._intent_classifier, "classify") as mock_classify:
        from src.services.intent_classifier import IntentResult, IntentType, RiskLevel
        from src.services.complexity_scorer import ComplexityScore

        mock_classify.return_value = IntentResult(
            intent=IntentType.DELETE,
            confidence=1.0,
            method="keyword",
            matched_keywords=["delete"],
            detected_resources=[],
            reasoning="test",
            risk_level=RiskLevel.CRITICAL,
        )
        with patch.object(router._complexity_scorer, "score") as mock_score:
            mock_score.return_value = ComplexityScore(score=5, features={})

            decision = await router.route("delete this service")

    # CRITICAL risk → CLAUDE，failover_manager 不應被呼叫
    assert decision.selected_provider == AIProviderEnum.CLAUDE
    mock_fm.select_provider.assert_not_awaited()


# =============================================================================
# Test 4: OPENCLAW_NEMO 路由 → failover_manager 不被呼叫
# =============================================================================


@pytest.mark.asyncio
async def test_router_uses_failover_for_diagnose_ollama_primary():
    """2026-04-29: DIAGNOSE intent → OLLAMA → failover_manager 應被呼叫

    推翻 A2 後 DIAGNOSE primary 為 OLLAMA（本地優先鐵律）
    failover_manager 對 OLLAMA primary 會檢查健康度（111 vs 188 CPU 備援切換）
    """
    mock_fm = MagicMock()
    mock_fm.select_provider = AsyncMock()
    # mock 回傳保持原 provider（無切換）
    mock_decision = MagicMock()
    mock_decision.primary.provider_name = "ollama"
    mock_decision.primary.model = "qwen2.5:7b-instruct"
    mock_decision.fallback_chain = []
    mock_fm.select_provider.return_value = mock_decision

    router = _make_router_with_mock_failover(mock_fm)

    decision = await router.route(
        "diagnose service crash",
        context={"intent_hint": "diagnose"},
    )

    # 推翻 A2：DIAGNOSE primary 是 OLLAMA
    assert decision.selected_provider == AIProviderEnum.OLLAMA
    # OLLAMA primary 觸發 failover_manager 健康檢查（111 vs 188）
    mock_fm.select_provider.assert_awaited()


# =============================================================================
# Test 5: failover_manager 發生例外 → fail-open，保留原始 OLLAMA
# =============================================================================


@pytest.mark.asyncio
async def test_router_failopen_when_failover_manager_raises():
    """failover_manager.select_provider 拋出例外 → fail-open，decision 仍然成功（使用原始 OLLAMA）"""
    mock_fm = MagicMock()
    mock_fm.select_provider = AsyncMock(side_effect=RuntimeError("redis timeout"))

    router = _make_router_with_mock_failover(mock_fm)

    # 2026-04-26 Wave4 v2 by Claude Opus 4.7 — 直接 mock _select_provider_and_model 強制初始 OLLAMA
    # → failover 觸發 → raises RuntimeError → fail-open → 保留 OLLAMA
    with patch.object(
        router,
        "_select_provider_and_model",
        return_value=(AIProviderEnum.OLLAMA, "qwen3:8b", "test forced ollama"),
    ):
        # 不應 raise，應 fail-open
        decision = await router.route("test alert message")

    # fail-open → 保留 OLLAMA（原始 initial decision）
    assert decision.selected_provider == AIProviderEnum.OLLAMA
    # fallback_chain 仍然存在（來自 _build_fallback_chain）
    assert len(decision.fallback_chain) > 0