/**
 * @file test_mcp_lifecycle_transport.cpp
 * @brief 测试MCP消息生命周期和传输相关功能
 * 
 * 本文件包含对MCP消息生命周期和SSE传输的单元测试，基于规范2024-11-05。
 */

#include "mcp_message.h"
#include "mcp_server.h"
#include "mcp_client.h"
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <string>
#include <thread>
#include <future>
#include <chrono>

// 测试类，用于设置服务器和客户端
class McpLifecycleTransportTest : public ::testing::Test {
protected:
    void SetUp() override {
        // 创建服务器
        server = std::make_unique<mcp::server>("localhost", 8096);
        server->set_server_info("TestServer", "2024-11-05");
        
        // 设置服务器能力
        mcp::json capabilities = {
            {"tools", {{"listChanged", true}}},
            {"transport", {{"sse", true}}}
        };
        server->set_capabilities(capabilities);
        
        // 注册一个简单的方法
        server->register_method("test_method", [](const mcp::json& params) -> mcp::json {
            return {{"result", "success"}, {"params_received", params}};
        });
        
        // 注册一个通知处理器
        server->register_notification("test_notification", [this](const mcp::json& params) {
            notification_received = true;
            notification_params = params;
        });
    }
    
    void TearDown() override {
        // 停止服务器
        if (server && server_thread.joinable()) {
            server->stop();
            server_thread.join();
        }
    }
    
    // 启动服务器
    void start_server() {
        server_thread = std::thread([this]() {
            server->start(false);
        });
        // 等待服务器启动
        std::this_thread::sleep_for(std::chrono::milliseconds(100));
    }
    
    std::unique_ptr<mcp::server> server;
    std::thread server_thread;
    bool notification_received = false;
    mcp::json notification_params;
};

// 测试消息生命周期 - 初始化
TEST_F(McpLifecycleTransportTest, InitializationTest) {
    // 启动服务器
    start_server();
    
    // 创建客户端
    mcp::client client("localhost", 8096);
    client.set_timeout(5);
    
    // 测试初始化
    bool init_result = client.initialize("TestClient", "1.0.0");
    EXPECT_TRUE(init_result);
    
    // 获取服务器能力
    mcp::json server_capabilities = client.get_server_capabilities();
    EXPECT_TRUE(server_capabilities.contains("tools"));
    EXPECT_TRUE(server_capabilities.contains("transport"));
    EXPECT_TRUE(server_capabilities["transport"]["sse"].get<bool>());
}

// 测试消息生命周期 - 请求和响应
TEST_F(McpLifecycleTransportTest, RequestResponseTest) {
    // 启动服务器
    start_server();
    
    // 创建客户端
    mcp::client client("localhost", 8096);
    client.set_timeout(5);
    client.initialize("TestClient", "1.0.0");
    
    // 发送请求并获取响应
    mcp::json params = {{"key", "value"}, {"number", 42}};
    mcp::response response = client.send_request("test_method", params);
    
    // 验证响应
    EXPECT_FALSE(response.is_error());
    EXPECT_EQ(response.result["result"], "success");
    EXPECT_EQ(response.result["params_received"]["key"], "value");
    EXPECT_EQ(response.result["params_received"]["number"], 42);
}

// 测试消息生命周期 - 通知
TEST_F(McpLifecycleTransportTest, NotificationTest) {
    // 启动服务器
    start_server();
    
    // 创建客户端
    mcp::client client("localhost", 8096);
    client.set_timeout(5);
    client.initialize("TestClient", "1.0.0");
    
    // 发送通知
    mcp::json params = {{"event", "update"}, {"status", "completed"}};
    client.send_notification("test_notification", params);
    
    // 等待通知处理
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
    
    // 验证通知已接收
    EXPECT_TRUE(notification_received);
    EXPECT_EQ(notification_params["event"], "update");
    EXPECT_EQ(notification_params["status"], "completed");
}

// 测试SSE传输 - 使用ping方法测试SSE连接
TEST_F(McpLifecycleTransportTest, SseTransportTest) {
    // 启动服务器
    start_server();
    
    // 注册一个特殊的方法，用于测试SSE连接
    server->register_method("sse_test", [](const mcp::json& params) -> mcp::json {
        return {{"sse_test_result", true}};
    });
    
    // 创建客户端
    mcp::client client("localhost", 8096);
    client.set_timeout(5);
    client.initialize("TestClient", "1.0.0");
    
    // 等待SSE连接建立
    std::this_thread::sleep_for(std::chrono::milliseconds(200));
    
    // 测试SSE连接是否正常工作 - 使用ping方法
    bool ping_result = client.ping();
    EXPECT_TRUE(ping_result);
    
    // 发送请求并获取响应，验证SSE连接正常工作
    mcp::response response = client.send_request("sse_test");
    EXPECT_FALSE(response.is_error());
    EXPECT_TRUE(response.result["sse_test_result"].get<bool>());
}

// 测试ping功能
TEST_F(McpLifecycleTransportTest, PingTest) {
    // 启动服务器
    start_server();
    
    // 创建客户端
    mcp::client client("localhost", 8096);
    client.set_timeout(5);
    client.initialize("TestClient", "1.0.0");
    
    // 测试ping
    bool ping_result = client.ping();
    EXPECT_TRUE(ping_result);
    
    // 停止服务器
    server->stop();
    server_thread.join();
    
    // 等待服务器完全停止
    std::this_thread::sleep_for(std::chrono::milliseconds(200));
    
    // 再次测试ping，应该失败
    ping_result = client.ping();
    EXPECT_FALSE(ping_result);
}