import pytest

from app.services.api_key_manager import APIKeyManager, KeySource
from app.services.llm.smart_router import ENGINE_COST_PROFILES, CostTier, SmartRouter
from app.services.llm.engine_selector import EngineSelector


class TestSmartRouterWithKeyManager:
    """SmartRouter与APIKeyManager集成测试"""

    @pytest.fixture
    def key_manager(self):
        km = APIKeyManager()
        km.add_key("deepseek", "test-deepseek-key", source=KeySource.SYSTEM, priority=1)
        km.add_key("qwen", "test-qwen-key", source=KeySource.SYSTEM, priority=1)
        km.add_key("gemini", "test-gemini-key", source=KeySource.ENV, priority=0)
        return km

    @pytest.fixture
    def key_manager_with_user_key(self):
        km = APIKeyManager()
        km.add_key("deepseek", "system-deepseek-key", source=KeySource.SYSTEM, priority=0)
        km.add_key("deepseek", "user-deepseek-key", source=KeySource.USER, priority=10, user_id="user_123")
        km.add_key("qwen", "system-qwen-key", source=KeySource.SYSTEM, priority=1)
        return km

    @pytest.fixture
    def key_manager_no_keys(self):
        return APIKeyManager()

    def test_router_accepts_key_manager(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        assert router._key_manager is key_manager

    def test_set_key_manager_after_init(self):
        router = SmartRouter()
        assert router._key_manager is None
        key_manager = APIKeyManager()
        router.set_key_manager(key_manager)
        assert router._key_manager is key_manager

    def test_filter_by_available_keys(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        all_engines = list(ENGINE_COST_PROFILES.keys())
        filtered = router._filter_by_available_keys(all_engines)
        assert "deepseek" in filtered
        assert "qwen" in filtered
        assert "gemini" in filtered
        assert "chatgpt" not in filtered
        assert "perplexity" not in filtered
        assert "wenxin" not in filtered

    def test_filter_by_available_keys_no_manager(self):
        router = SmartRouter()
        all_engines = list(ENGINE_COST_PROFILES.keys())
        filtered = router._filter_by_available_keys(all_engines)
        assert set(filtered) == set(all_engines)

    def test_select_engines_filters_no_key(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        selected = router.select_engines(max_engines=10)
        for engine in selected:
            key = key_manager.get_any_available_key(engine)
            assert key is not None, f"Selected engine {engine} has no available key"

    def test_select_engines_returns_subset(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        selected = router.select_engines(max_engines=2)
        assert len(selected) <= 2
        assert len(selected) > 0

    def test_select_engines_user_key_priority(self, key_manager_with_user_key):
        router = SmartRouter(key_manager=key_manager_with_user_key)
        selected = router.select_engines(max_engines=10)
        assert "deepseek" in selected
        key = key_manager_with_user_key.get_any_available_key("deepseek")
        assert key == "user-deepseek-key"

    def test_get_available_engines(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        available = router.get_available_engines()
        for engine in available:
            key = key_manager.get_any_available_key(engine)
            assert key is not None

    def test_get_engines_by_cost_tier_with_filter(self, key_manager):
        router = SmartRouter(key_manager=key_manager)
        free_engines = router.get_engines_by_cost_tier(CostTier.FREE)
        for engine in free_engines:
            profile = ENGINE_COST_PROFILES[engine]
            assert profile.cost_tier == CostTier.FREE
            key = key_manager.get_any_available_key(engine)
            assert key is not None

    def test_all_engines_no_keys_returns_empty(self, key_manager_no_keys):
        router = SmartRouter(key_manager=key_manager_no_keys)
        selected = router.select_engines(max_engines=5)
        assert selected == [] or all(
            ENGINE_COST_PROFILES[e].cost_tier in [CostTier.FREE, CostTier.LOW_COST]
            and not ENGINE_COST_PROFILES[e].requires_own_key
            for e in selected
        )


class TestEngineSelector:
    """EngineSelector智能引擎选择器测试"""

    @pytest.fixture
    def key_manager(self):
        km = APIKeyManager()
        km.add_key("deepseek", "test-deepseek-key", source=KeySource.SYSTEM)
        km.add_key("qwen", "test-qwen-key", source=KeySource.SYSTEM)
        km.add_key("gemini", "test-gemini-key", source=KeySource.ENV)
        km.add_key("wenxin", "test-wenxin-key", source=KeySource.SYSTEM)
        return km

    @pytest.fixture
    def selector(self, key_manager):
        return EngineSelector(key_manager=key_manager)

    def test_initialization(self, selector, key_manager):
        assert selector.key_manager is key_manager
        assert selector.router is not None
        assert selector.router._key_manager is key_manager

    def test_select_engines_returns_valid_engines(self, selector, key_manager):
        selected = selector.select_engines(max_engines=5)
        for engine in selected:
            key = key_manager.get_any_available_key(engine)
            assert key is not None, f"Engine {engine} selected but has no key"

    def test_select_engines_respects_max_engines(self, selector):
        selected = selector.select_engines(max_engines=2)
        assert len(selected) <= 2

    def test_select_engines_with_min_cost_tier(self, selector):
        selected = selector.select_engines(max_engines=10, min_cost_tier="free")
        for engine in selected:
            profile = ENGINE_COST_PROFILES[engine]
            assert profile.cost_tier in [CostTier.FREE, CostTier.LOW_COST, CostTier.MID_COST, CostTier.HIGH_COST]
            tier_order = ["free", "low_cost", "mid_cost", "high_cost"]
            assert tier_order.index(profile.cost_tier.value) >= tier_order.index("free")

    def test_get_best_value_engine(self, selector, key_manager):
        best = selector.get_best_value_engine()
        if best:
            profile = ENGINE_COST_PROFILES[best]
            key = key_manager.get_any_available_key(best)
            assert key is not None
            assert profile.cost_tier in [CostTier.FREE, CostTier.LOW_COST]

    def test_get_best_value_returns_none_when_no_keys(self):
        km = APIKeyManager()
        selector = EngineSelector(key_manager=km)
        best = selector.get_best_value_engine()
        assert best is None

    def test_select_engines_priority_domestic(self, selector):
        selected = selector.select_engines(max_engines=10, prefer_domestic=True)
        domestic = [e for e in selected if ENGINE_COST_PROFILES[e].domestic]
        international = [e for e in selected if not ENGINE_COST_PROFILES[e].domestic]
        if domestic and international:
            last_domestic_idx = max(selected.index(e) for e in domestic)
            first_intl_idx = min(selected.index(e) for e in international)
            assert last_domestic_idx < first_intl_idx