"""
Tests for Slot State Cache.
[AC-MRS-SLOT-CACHE-01] 多轮状态持久化测试
"""

import json
import time
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from app.services.cache.slot_state_cache import (
    CachedSlotState,
    CachedSlotValue,
    SlotStateCache,
    get_slot_state_cache,
)


class TestCachedSlotValue:
    """CachedSlotValue 测试"""

    def test_init(self):
        """测试初始化"""
        value = CachedSlotValue(
            value="test_value",
            source="user_confirmed",
            confidence=0.9,
        )
        assert value.value == "test_value"
        assert value.source == "user_confirmed"
        assert value.confidence == 0.9
        assert value.updated_at > 0

    def test_to_dict(self):
        """测试转换为字典"""
        value = CachedSlotValue(
            value="test_value",
            source="rule_extracted",
            confidence=0.8,
        )
        d = value.to_dict()
        assert d["value"] == "test_value"
        assert d["source"] == "rule_extracted"
        assert d["confidence"] == 0.8
        assert "updated_at" in d

    def test_from_dict(self):
        """测试从字典创建"""
        d = {
            "value": "test_value",
            "source": "llm_inferred",
            "confidence": 0.7,
            "updated_at": 12345.0,
        }
        value = CachedSlotValue.from_dict(d)
        assert value.value == "test_value"
        assert value.source == "llm_inferred"
        assert value.confidence == 0.7
        assert value.updated_at == 12345.0


class TestCachedSlotState:
    """CachedSlotState 测试"""

    def test_init(self):
        """测试初始化"""
        state = CachedSlotState()
        assert state.filled_slots == {}
        assert state.slot_to_field_map == {}
        assert state.created_at > 0
        assert state.updated_at > 0

    def test_with_slots(self):
        """测试带槽位初始化"""
        slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed"),
            "product": CachedSlotValue(value="手机", source="rule_extracted"),
        }
        state = CachedSlotState(
            filled_slots=slots,
            slot_to_field_map={"region": "region_field"},
        )
        assert len(state.filled_slots) == 2
        assert state.slot_to_field_map["region"] == "region_field"

    def test_to_dict_and_from_dict(self):
        """测试序列化和反序列化"""
        slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed"),
        }
        original = CachedSlotState(
            filled_slots=slots,
            slot_to_field_map={"region": "region_field"},
        )
        
        d = original.to_dict()
        restored = CachedSlotState.from_dict(d)
        
        assert len(restored.filled_slots) == 1
        assert restored.filled_slots["region"].value == "北京"
        assert restored.filled_slots["region"].source == "user_confirmed"
        assert restored.slot_to_field_map["region"] == "region_field"

    def test_get_simple_filled_slots(self):
        """测试获取简化槽位字典"""
        slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed"),
            "product": CachedSlotValue(value="手机", source="rule_extracted"),
        }
        state = CachedSlotState(filled_slots=slots)
        simple = state.get_simple_filled_slots()
        assert simple == {"region": "北京", "product": "手机"}

    def test_get_slot_sources(self):
        """测试获取槽位来源"""
        slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed"),
            "product": CachedSlotValue(value="手机", source="rule_extracted"),
        }
        state = CachedSlotState(filled_slots=slots)
        sources = state.get_slot_sources()
        assert sources == {"region": "user_confirmed", "product": "rule_extracted"}

    def test_get_slot_confidence(self):
        """测试获取槽位置信度"""
        slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed", confidence=1.0),
            "product": CachedSlotValue(value="手机", source="rule_extracted", confidence=0.8),
        }
        state = CachedSlotState(filled_slots=slots)
        confidence = state.get_slot_confidence()
        assert confidence == {"region": 1.0, "product": 0.8}


class TestSlotStateCache:
    """SlotStateCache 测试"""

    def test_source_priority(self):
        """测试来源优先级"""
        cache = SlotStateCache()
        assert cache._get_source_priority("user_confirmed") == 100
        assert cache._get_source_priority("rule_extracted") == 80
        assert cache._get_source_priority("llm_inferred") == 60
        assert cache._get_source_priority("context") == 40
        assert cache._get_source_priority("default") == 20
        assert cache._get_source_priority("unknown") == 0

    def test_make_key(self):
        """测试 key 生成"""
        cache = SlotStateCache()
        key = cache._make_key("tenant_123", "session_456")
        assert key == "slot_state:tenant_123:session_456"

    @pytest.mark.asyncio
    async def test_l1_cache_hit(self):
        """测试 L1 缓存命中"""
        cache = SlotStateCache()
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={"region": CachedSlotValue(value="北京", source="user_confirmed")},
        )
        
        cache._local_cache[f"{tenant_id}:{session_id}"] = (state, time.time())
        
        result = await cache.get(tenant_id, session_id)
        assert result is not None
        assert result.filled_slots["region"].value == "北京"

    @pytest.mark.asyncio
    async def test_l1_cache_expired(self):
        """测试 L1 缓存过期"""
        cache = SlotStateCache()
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={"region": CachedSlotValue(value="北京", source="user_confirmed")},
        )
        
        old_time = time.time() - 400
        cache._local_cache[f"{tenant_id}:{session_id}"] = (state, old_time)
        
        result = await cache.get(tenant_id, session_id)
        assert result is None
        assert f"{tenant_id}:{session_id}" not in cache._local_cache

    @pytest.mark.asyncio
    async def test_set_and_get_l1(self):
        """测试设置和获取 L1 缓存"""
        cache = SlotStateCache(redis_client=None)
        cache._enabled = False
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={"region": CachedSlotValue(value="北京", source="user_confirmed")},
        )
        
        await cache.set(tenant_id, session_id, state)
        
        local_key = f"{tenant_id}:{session_id}"
        assert local_key in cache._local_cache
        
        result = await cache.get(tenant_id, session_id)
        assert result is not None
        assert result.filled_slots["region"].value == "北京"

    @pytest.mark.asyncio
    async def test_delete(self):
        """测试删除缓存"""
        cache = SlotStateCache(redis_client=None)
        cache._enabled = False
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={"region": CachedSlotValue(value="北京", source="user_confirmed")},
        )
        
        await cache.set(tenant_id, session_id, state)
        await cache.delete(tenant_id, session_id)
        
        result = await cache.get(tenant_id, session_id)
        assert result is None

    @pytest.mark.asyncio
    async def test_clear_slot(self):
        """测试清除单个槽位"""
        cache = SlotStateCache(redis_client=None)
        cache._enabled = False
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={
                "region": CachedSlotValue(value="北京", source="user_confirmed"),
                "product": CachedSlotValue(value="手机", source="rule_extracted"),
            },
        )
        
        await cache.set(tenant_id, session_id, state)
        await cache.clear_slot(tenant_id, session_id, "region")
        
        result = await cache.get(tenant_id, session_id)
        assert result is not None
        assert "region" not in result.filled_slots
        assert "product" in result.filled_slots

    @pytest.mark.asyncio
    async def test_merge_and_set_priority(self):
        """测试合并时优先级处理"""
        cache = SlotStateCache(redis_client=None)
        cache._enabled = False
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        existing_state = CachedSlotState(
            filled_slots={
                "region": CachedSlotValue(value="上海", source="llm_inferred", confidence=0.6),
            },
        )
        await cache.set(tenant_id, session_id, existing_state)
        
        new_slots = {
            "region": CachedSlotValue(value="北京", source="user_confirmed", confidence=1.0),
        }
        
        result = await cache.merge_and_set(tenant_id, session_id, new_slots)
        
        assert result.filled_slots["region"].value == "北京"
        assert result.filled_slots["region"].source == "user_confirmed"

    @pytest.mark.asyncio
    async def test_merge_and_set_lower_priority_ignored(self):
        """测试低优先级值被忽略"""
        cache = SlotStateCache(redis_client=None)
        cache._enabled = False
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        existing_state = CachedSlotState(
            filled_slots={
                "region": CachedSlotValue(value="北京", source="user_confirmed", confidence=1.0),
            },
        )
        await cache.set(tenant_id, session_id, existing_state)
        
        new_slots = {
            "region": CachedSlotValue(value="上海", source="llm_inferred", confidence=0.6),
        }
        
        result = await cache.merge_and_set(tenant_id, session_id, new_slots)
        
        assert result.filled_slots["region"].value == "北京"
        assert result.filled_slots["region"].source == "user_confirmed"


class TestGetSlotStateCache:
    """get_slot_state_cache 单例测试"""

    def test_singleton(self):
        """测试单例模式"""
        cache1 = get_slot_state_cache()
        cache2 = get_slot_state_cache()
        assert cache1 is cache2


class TestSlotStateCacheWithRedis:
    """SlotStateCache Redis 集成测试"""

    @pytest.mark.asyncio
    async def test_redis_set_and_get(self):
        """测试 Redis 存取"""
        mock_redis = AsyncMock()
        mock_redis.get = AsyncMock(return_value=None)
        mock_redis.setex = AsyncMock(return_value=True)
        
        cache = SlotStateCache(redis_client=mock_redis)
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        state = CachedSlotState(
            filled_slots={"region": CachedSlotValue(value="北京", source="user_confirmed")},
        )
        
        await cache.set(tenant_id, session_id, state)
        
        mock_redis.setex.assert_called_once()
        call_args = mock_redis.setex.call_args
        assert call_args[0][0] == f"slot_state:{tenant_id}:{session_id}"

    @pytest.mark.asyncio
    async def test_redis_get_hit(self):
        """测试 Redis 命中"""
        state_dict = {
            "filled_slots": {
                "region": {
                    "value": "北京",
                    "source": "user_confirmed",
                    "confidence": 1.0,
                    "updated_at": 12345.0,
                }
            },
            "slot_to_field_map": {"region": "region_field"},
            "created_at": 12340.0,
            "updated_at": 12345.0,
        }
        
        mock_redis = AsyncMock()
        mock_redis.get = AsyncMock(return_value=json.dumps(state_dict))
        
        cache = SlotStateCache(redis_client=mock_redis)
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        result = await cache.get(tenant_id, session_id)
        
        assert result is not None
        assert result.filled_slots["region"].value == "北京"
        assert result.filled_slots["region"].source == "user_confirmed"

    @pytest.mark.asyncio
    async def test_redis_delete(self):
        """测试 Redis 删除"""
        mock_redis = AsyncMock()
        mock_redis.delete = AsyncMock(return_value=1)
        
        cache = SlotStateCache(redis_client=mock_redis)
        
        tenant_id = "tenant_1"
        session_id = "session_1"
        
        await cache.delete(tenant_id, session_id)
        
        mock_redis.delete.assert_called_once_with(f"slot_state:{tenant_id}:{session_id}")


class TestCacheTTL:
    """TTL 配置测试"""

    def test_default_ttl(self):
        """测试默认 TTL"""
        cache = SlotStateCache()
        assert cache._cache_ttl == 1800

    def test_local_cache_ttl(self):
        """测试本地缓存 TTL"""
        cache = SlotStateCache()
        assert cache._local_cache_ttl == 300