"""
后端服务单元测试套件

测试覆盖：
- 认证模块（登录/令牌/API Key）
- K 线数据服务
- 实时行情服务
- 告警服务
- 订阅服务
- 用户管理
"""
import pytest
from datetime import datetime, timedelta
from fastapi.testclient import TestClient
from unittest.mock import Mock, patch, MagicMock

from app.main import app
from app.config import settings
from app.services.auth_service import (
    verify_password,
    get_password_hash,
    create_access_token,
    create_refresh_token,
    decode_token,
    generate_api_key,
    hash_api_key
)
from app.services.kline_service import KlineService
from app.services.alert_service import AlertService
from app.services.subscription_service import SubscriptionService

client = TestClient(app)


# ==================== 认证服务测试 ====================

class TestAuthService:
    """认证服务测试"""
    
    def test_password_hashing(self):
        """测试密码哈希"""
        password = "test_password_123"
        hashed = get_password_hash(password)
        
        assert hashed is not None
        assert hashed != password
        assert len(hashed) > 50
    
    def test_password_verification_success(self):
        """测试密码验证成功"""
        password = "test_password_123"
        hashed = get_password_hash(password)
        
        assert verify_password(password, hashed) is True
    
    def test_password_verification_failure(self):
        """测试密码验证失败"""
        password = "test_password_123"
        wrong_password = "wrong_password"
        hashed = get_password_hash(password)
        
        assert verify_password(wrong_password, hashed) is False
    
    def test_create_access_token(self):
        """测试创建访问令牌"""
        data = {"sub": "testuser", "user_id": 1}
        token = create_access_token(data)
        
        assert token is not None
        assert len(token) > 50
        
        # 解码验证
        payload = decode_token(token)
        assert payload["sub"] == "testuser"
        assert payload["user_id"] == 1
        assert "exp" in payload
    
    def test_create_access_token_with_expiry(self):
        """测试创建带过期时间的令牌"""
        data = {"sub": "testuser"}
        expires_delta = timedelta(hours=2)
        token = create_access_token(data, expires_delta=expires_delta)
        
        payload = decode_token(token)
        assert payload["exp"] is not None
    
    def test_create_refresh_token(self):
        """测试创建刷新令牌"""
        data = {"sub": "testuser", "user_id": 1}
        token = create_refresh_token(data)
        
        assert token is not None
        
        payload = decode_token(token)
        assert payload["sub"] == "testuser"
        assert payload["type"] == "refresh"
    
    def test_decode_invalid_token(self):
        """测试解码无效令牌"""
        invalid_token = "invalid.token.here"
        
        with pytest.raises(Exception):
            decode_token(invalid_token)
    
    def test_decode_expired_token(self):
        """测试解码过期令牌"""
        data = {"sub": "testuser"}
        expires_delta = timedelta(seconds=-1)  # 已过期
        token = create_access_token(data, expires_delta=expires_delta)
        
        with pytest.raises(Exception):
            decode_token(token)
    
    def test_generate_api_key(self):
        """测试生成 API Key"""
        api_key = generate_api_key()
        
        assert api_key is not None
        assert len(api_key) == 64  # SHA256 哈希长度
    
    def test_hash_api_key(self):
        """测试哈希 API Key"""
        api_key = "test_api_key_123456"
        hashed = hash_api_key(api_key)
        
        assert hashed is not None
        assert hashed != api_key


# ==================== K 线数据服务测试 ====================

class TestKlineService:
    """K 线数据服务测试"""
    
    @patch('app.services.kline_service.TimescaleSessionLocal')
    def test_get_kline_data(self, mock_session):
        """测试获取 K 线数据"""
        # 模拟数据库查询结果
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        mock_result = [
            (datetime(2024, 1, 1, 10, 0), 4000.0, 4050.0, 3980.0, 4020.0, 1000, 4000000.0, 500),
            (datetime(2024, 1, 1, 10, 5), 4020.0, 4080.0, 4010.0, 4060.0, 1200, 4800000.0, 520),
        ]
        mock_db.execute.return_value.fetchall.return_value = mock_result
        
        start = datetime(2024, 1, 1, 10, 0)
        end = datetime(2024, 1, 1, 12, 0)
        
        result = KlineService.get_kline_data("IF2406", "5m", start, end)
        
        assert result is not None
        assert len(result) == 2
        assert result[0]["symbol"] == "IF2406"
        assert result[0]["open"] == 4000.0
    
    @patch('app.services.kline_service.TimescaleSessionLocal')
    def test_get_latest_kline(self, mock_session):
        """测试获取最新 K 线"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        mock_result = [(datetime(2024, 1, 1, 12, 0), 4100.0, 4150.0, 4080.0, 4120.0, 1500, 6000000.0, 600)]
        mock_db.execute.return_value.fetchone.return_value = mock_result[0]
        
        result = KlineService.get_latest_kline("IF2406", "5m")
        
        assert result is not None
        assert result["close"] == 4120.0
    
    @patch('app.services.kline_service.TimescaleSessionLocal')
    def test_get_symbols(self, mock_session):
        """测试获取品种列表"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        mock_result = [("IF2406",), ("IC2406",), ("IH2406",)]
        mock_db.execute.return_value.fetchall.return_value = mock_result
        
        result = KlineService.get_symbols()
        
        assert len(result) == 3
        assert "IF2406" in result
    
    @patch('app.services.kline_service.TimescaleSessionLocal')
    def test_get_periods(self, mock_session):
        """测试获取周期列表"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        mock_result = [("1m",), ("5m",), ("1h",), ("1d",)]
        mock_db.execute.return_value.fetchall.return_value = mock_result
        
        result = KlineService.get_periods()
        
        assert len(result) == 4
        assert "5m" in result


# ==================== 告警服务测试 ====================

class TestAlertService:
    """告警服务测试"""
    
    @patch('app.services.alert_service.SQLiteSessionLocal')
    def test_create_alert(self, mock_session):
        """测试创建告警"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        mock_alert = Mock()
        mock_alert.id = 1
        mock_alert.user_id = 1
        mock_alert.symbol = "IF2406"
        mock_alert.condition_type = "greater_than"
        mock_alert.condition_value = 4000.0
        mock_alert.status = "active"
        
        mock_db.add = Mock()
        mock_db.commit = Mock()
        mock_db.refresh = Mock()
        
        # 模拟 add 后可以通过 query 获取
        mock_db.query.return_value.filter.return_value.first.return_value = mock_alert
        
        result = AlertService.create_alert(
            user_id=1,
            symbol="IF2406",
            condition_type="greater_than",
            condition_value=4000.0
        )
        
        assert mock_db.add.called
        assert mock_db.commit.called


# ==================== 订阅服务测试 ====================

class TestSubscriptionService:
    """订阅服务测试"""
    
    @patch('app.services.subscription_service.SQLiteSessionLocal')
    def test_create_subscription(self, mock_session):
        """测试创建订阅"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        # 模拟不存在已有订阅
        mock_db.query.return_value.filter.return_value.first.return_value = None
        
        mock_subscription = Mock()
        mock_subscription.id = 1
        mock_subscription.user_id = 1
        mock_subscription.symbol = "IF2406"
        mock_subscription.period = "5m"
        mock_subscription.is_active = True
        
        mock_db.add = Mock()
        mock_db.commit = Mock()
        mock_db.refresh = Mock()
        mock_db.query.return_value.filter.return_value.first.return_value = mock_subscription
        
        result = SubscriptionService.create_subscription(
            user_id=1,
            symbol="IF2406",
            period="5m",
            subscription_type="kline"
        )
        
        assert mock_db.add.called
        assert mock_db.commit.called
    
    @patch('app.services.subscription_service.SQLiteSessionLocal')
    def test_create_duplicate_subscription(self, mock_session):
        """测试创建重复订阅"""
        mock_db = MagicMock()
        mock_session.return_value.__enter__.return_value = mock_db
        
        # 模拟已存在订阅
        existing_subscription = Mock()
        existing_subscription.is_active = True
        
        mock_db.query.return_value.filter.return_value.first.return_value = existing_subscription
        
        result = SubscriptionService.create_subscription(
            user_id=1,
            symbol="IF2406",
            period="5m",
            subscription_type="kline"
        )
        
        # 已存在时不应调用 add
        assert not mock_db.add.called


# ==================== API 端点测试 ====================

class TestHealthCheck:
    """健康检查测试"""
    
    def test_health_check(self):
        """测试健康检查端点"""
        response = client.get("/health")
        
        assert response.status_code == 200
        data = response.json()
        assert data["status"] == "healthy"
        assert "timestamp" in data
    
    def test_root_endpoint(self):
        """测试根路径端点"""
        response = client.get("/")
        
        assert response.status_code == 200
        data = response.json()
        assert data["name"] == settings.APP_NAME
        assert data["version"] == settings.APP_VERSION


class TestAuthAPI:
    """认证 API 测试"""
    
    def test_login_missing_credentials(self):
        """测试登录缺少凭证"""
        response = client.post("/api/v1/auth/login", data={})
        
        assert response.status_code in [401, 422]  # 401 或 422 都是合理的
    
    def test_login_wrong_credentials(self):
        """测试登录错误凭证"""
        response = client.post(
            "/api/v1/auth/login",
            data={"username": "nonexistent", "password": "wrongpassword"}
        )
        
        # 可能返回 401（认证失败）或 200（如果数据库中有测试用户）
        assert response.status_code in [200, 401]
    
    def test_docs_accessible(self):
        """测试 API 文档可访问"""
        response = client.get("/docs")
        
        assert response.status_code == 200
    
    def test_openapi_schema(self):
        """测试 OpenAPI 模式"""
        response = client.get("/openapi.json")
        
        assert response.status_code == 200
        data = response.json()
        assert "paths" in data
        assert "/api/v1/auth/login" in data["paths"]


class TestKlineAPI:
    """K 线数据 API 测试"""
    
    def test_get_symbols_unauthorized(self):
        """测试未授权获取品种列表"""
        response = client.get("/api/v1/kline/symbols")
        
        # 应该需要认证
        assert response.status_code in [200, 401]
    
    def test_get_periods_unauthorized(self):
        """测试未授权获取周期列表"""
        response = client.get("/api/v1/kline/periods")
        
        assert response.status_code in [200, 401]
    
    def test_get_kline_data_missing_params(self):
        """测试获取 K 线数据缺少参数"""
        response = client.get("/api/v1/kline/data")
        
        # 缺少必要参数应该返回 422
        assert response.status_code in [401, 422]


class TestUserAPI:
    """用户管理 API 测试"""
    
    def test_create_user(self):
        """测试创建用户"""
        response = client.post(
            "/api/v1/user",
            json={
                "username": "testuser_" + str(datetime.now().timestamp()),
                "password": "testpass123",
                "email": "test@example.com"
            }
        )
        
        # 可能成功或因为用户名已存在而失败
        assert response.status_code in [200, 400]


class TestAlertAPI:
    """告警 API 测试"""
    
    def test_create_alert_unauthorized(self):
        """测试未授权创建告警"""
        response = client.post(
            "/api/v1/alert",
            json={
                "symbol": "IF2406",
                "condition_type": "greater_than",
                "condition_value": 4000.0
            }
        )
        
        # 需要认证
        assert response.status_code == 401


class TestSubscriptionAPI:
    """订阅 API 测试"""
    
    def test_create_subscription_unauthorized(self):
        """测试未授权创建订阅"""
        response = client.post(
            "/api/v1/subscription",
            json={
                "symbol": "IF2406",
                "subscription_type": "kline"
            }
        )
        
        # 需要认证
        assert response.status_code == 401


# ==================== 中间件测试 ====================

class TestMiddleware:
    """中间件测试"""
    
    def test_cors_headers(self):
        """测试 CORS 头"""
        response = client.options(
            "/api/v1/kline/symbols",
            headers={
                "Origin": "http://localhost:3000",
                "Access-Control-Request-Method": "GET"
            }
        )
        
        # CORS 应该允许跨域
        assert response.status_code in [200, 401]


# ==================== 集成测试 ====================

class TestIntegration:
    """集成测试"""
    
    def test_full_auth_flow(self):
        """测试完整认证流程"""
        # 1. 尝试登录（可能失败，因为数据库可能没有测试用户）
        login_response = client.post(
            "/api/v1/auth/login",
            data={"username": "admin", "password": "admin123"}
        )
        
        # 如果登录成功，测试令牌使用
        if login_response.status_code == 200:
            token = login_response.json()["data"]["access_token"]
            
            # 2. 使用令牌访问受保护端点
            headers = {"Authorization": f"Bearer {token}"}
            kline_response = client.get("/api/v1/kline/symbols", headers=headers)
            
            assert kline_response.status_code == 200


# ==================== 性能测试 ====================

class TestPerformance:
    """性能测试"""
    
    def test_health_check_response_time(self):
        """测试健康检查响应时间"""
        import time
        
        start = time.time()
        response = client.get("/health")
        elapsed = time.time() - start
        
        assert response.status_code == 200
        assert elapsed < 1.0  # 响应时间应小于 1 秒


if __name__ == "__main__":
    pytest.main([__file__, "-v", "--cov=app", "--cov-report=html"])