/**
 * @file test_mcp_resource.cpp
 * @brief Test MCP resource related functionality
 * 
 * This file contains unit tests for the MCP resource module, based on the 2024-11-05 specification.
 */

#include "mcp_resource.h"
#include "mcp_server.h"
#include "mcp_client.h"
#include "base64.hpp"
#include <gtest/gtest.h>
#include <gmock/gmock.h>
#include <string>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <thread>
#include <chrono>

// Create a test directory and file
class ResourceTest : public ::testing::Test {
protected:
    void SetUp() override {
        // Create test directory
        test_dir = std::filesystem::temp_directory_path() / "mcp_test";
        std::filesystem::create_directories(test_dir);
        
        // Create test file
        test_file = test_dir / "test.txt";
        std::ofstream file(test_file);
        file << "Test file content";
        file.close();
        
        // Output test directory and file path for debugging
        std::cout << "Test directory: " << test_dir << std::endl;
        std::cout << "Test file: " << test_file << std::endl;
        
        // Ensure file exists
        ASSERT_TRUE(std::filesystem::exists(test_file)) << "Test file was not created successfully";
    }
    
    void TearDown() override {
        // Clean up test directory
        std::filesystem::remove_all(test_dir);
    }
    
    std::filesystem::path test_dir;
    std::filesystem::path test_file;
};

// Test text resource
TEST(McpResourceTest, TextResourceTest) {
    // Create text resource
    mcp::text_resource resource("test://example.txt", "example.txt", "text/plain", "Example text resource");
    
    // Test metadata
    mcp::json metadata = resource.get_metadata();
    EXPECT_EQ(metadata["uri"], "test://example.txt");
    EXPECT_EQ(metadata["name"], "example.txt");
    EXPECT_EQ(metadata["mimeType"], "text/plain");
    EXPECT_EQ(metadata["description"], "Example text resource");
    
    // Test URI
    EXPECT_EQ(resource.get_uri(), "test://example.txt");
    
    // Test setting and getting text
    std::string test_content = "This is a test content";
    resource.set_text(test_content);
    EXPECT_EQ(resource.get_text(), test_content);
    
    // Test read
    mcp::json content = resource.read();
    EXPECT_EQ(content["uri"], "test://example.txt");
    EXPECT_EQ(content["mimeType"], "text/plain");
    EXPECT_EQ(content["text"], test_content);
    
    // Test modification
    EXPECT_FALSE(resource.is_modified());
    resource.set_text("New content");
    EXPECT_TRUE(resource.is_modified());
    
    // Test read after modification
    content = resource.read();
    EXPECT_EQ(content["text"], "New content");
    EXPECT_FALSE(resource.is_modified());
}

// Test binary resource
TEST(McpResourceTest, BinaryResourceTest) {
    // Create binary resource
    mcp::binary_resource resource("test://example.bin", "example.bin", "application/octet-stream", "Example binary resource");
    
    // Test metadata
    mcp::json metadata = resource.get_metadata();
    EXPECT_EQ(metadata["uri"], "test://example.bin");
    EXPECT_EQ(metadata["name"], "example.bin");
    EXPECT_EQ(metadata["mimeType"], "application/octet-stream");
    EXPECT_EQ(metadata["description"], "Example binary resource");
    
    // Test URI
    EXPECT_EQ(resource.get_uri(), "test://example.bin");
    
    // Test setting and getting binary data
    std::vector<uint8_t> test_data = {0x48, 0x65, 0x6C, 0x6C, 0x6F}; // "Hello" in ASCII
    resource.set_data(test_data.data(), test_data.size());
    const auto& data = resource.get_data();
    EXPECT_EQ(data.size(), test_data.size());
    EXPECT_TRUE(std::equal(data.begin(), data.end(), test_data.begin()));
    
    // Test read
    mcp::json content = resource.read();
    EXPECT_EQ(content["uri"], "test://example.bin");
    EXPECT_EQ(content["mimeType"], "application/octet-stream");
    
    // Base64 encode the data for comparison
    std::string base64_data = base64::encode(reinterpret_cast<const char*>(test_data.data()), test_data.size());
    EXPECT_EQ(content["blob"], base64_data);
    
    // Test modification
    EXPECT_FALSE(resource.is_modified());
    std::vector<uint8_t> new_data = {0x57, 0x6F, 0x72, 0x6C, 0x64}; // "World" in ASCII
    resource.set_data(new_data.data(), new_data.size());
    EXPECT_TRUE(resource.is_modified());
    
    // Test read after modification
    content = resource.read();
    std::string new_base64_data = base64::encode(reinterpret_cast<const char*>(new_data.data()), new_data.size());
    EXPECT_EQ(content["blob"], new_base64_data);
    EXPECT_FALSE(resource.is_modified());
}

// Test file resource
TEST_F(ResourceTest, FileResourceTest) {
    // Create file resource
    mcp::file_resource resource(test_file.string());
    
    // Test metadata
    mcp::json metadata = resource.get_metadata();
    EXPECT_EQ(metadata["uri"], "file://" + test_file.string());
    EXPECT_EQ(metadata["name"], test_file.filename().string());
    EXPECT_EQ(metadata["mimeType"], "text/plain");
    
    // Test URI
    EXPECT_EQ(resource.get_uri(), "file://" + test_file.string());
    
    // Test read
    mcp::json content = resource.read();
    EXPECT_EQ(content["uri"], "file://" + test_file.string());
    EXPECT_EQ(content["mimeType"], "text/plain");
    EXPECT_EQ(content["text"], "Test file content");
    
    // Test modification detection
    EXPECT_FALSE(resource.is_modified());
    
    // Modify file
    {
        std::ofstream file(test_file);
        file << "Modified content";
        file.close();
    }
    
    // Test modification detection after file change
    EXPECT_TRUE(resource.is_modified());
    
    // Test read after modification
    content = resource.read();
    EXPECT_EQ(content["text"], "Modified content");
    EXPECT_FALSE(resource.is_modified());
    
    // Test file deletion detection
    std::filesystem::remove(test_file);
    EXPECT_TRUE(resource.is_modified());
}

// Test resource manager
TEST_F(ResourceTest, ResourceManagerTest) {
    // Get resource manager instance
    mcp::resource_manager& manager = mcp::resource_manager::instance();
    
    // Create resources
    auto text_res = std::make_shared<mcp::text_resource>("test://text.txt", "text.txt", "text/plain", "Text resource");
    auto binary_res = std::make_shared<mcp::binary_resource>("test://binary.bin", "binary.bin", "application/octet-stream", "Binary resource");
    auto file_res = std::make_shared<mcp::file_resource>(test_file.string());
    
    // Set content
    text_res->set_text("Text resource content");
    std::vector<uint8_t> binary_data = {0x42, 0x69, 0x6E, 0x61, 0x72, 0x79}; // "Binary" in ASCII
    binary_res->set_data(binary_data.data(), binary_data.size());
    
    // Register resources
    manager.register_resource(text_res);
    manager.register_resource(binary_res);
    manager.register_resource(file_res);
    
    // Test list resources
    mcp::json resources_list = manager.list_resources();
    EXPECT_EQ(resources_list["resources"].size(), 3);
    
    // Test get resource
    auto retrieved_text_res = manager.get_resource("test://text.txt");
    ASSERT_NE(retrieved_text_res, nullptr);
    EXPECT_EQ(retrieved_text_res->get_uri(), "test://text.txt");
    
    auto retrieved_binary_res = manager.get_resource("test://binary.bin");
    ASSERT_NE(retrieved_binary_res, nullptr);
    EXPECT_EQ(retrieved_binary_res->get_uri(), "test://binary.bin");
    
    auto retrieved_file_res = manager.get_resource("file://" + test_file.string());
    ASSERT_NE(retrieved_file_res, nullptr);
    EXPECT_EQ(retrieved_file_res->get_uri(), "file://" + test_file.string());
    
    // Test unregister resource
    EXPECT_TRUE(manager.unregister_resource("test://text.txt"));
    EXPECT_EQ(manager.get_resource("test://text.txt"), nullptr);
    
    // Test resources list after unregister
    resources_list = manager.list_resources();
    EXPECT_EQ(resources_list["resources"].size(), 2);
    
    // Test subscription
    bool notification_received = false;
    std::string notification_uri;
    
    int subscription_id = manager.subscribe("test://binary.bin", [&](const std::string& uri) {
        notification_received = true;
        notification_uri = uri;
    });
    
    // Modify resource and notify
    binary_res->set_data(binary_data.data(), binary_data.size()); // This sets modified flag
    manager.notify_resource_changed("test://binary.bin");
    
    // Check notification
    EXPECT_TRUE(notification_received);
    EXPECT_EQ(notification_uri, "test://binary.bin");
    
    // Test unsubscribe
    EXPECT_TRUE(manager.unsubscribe(subscription_id));
    
    // Reset notification flags
    notification_received = false;
    notification_uri = "";
    
    // Modify and notify again
    binary_res->set_data(binary_data.data(), binary_data.size());
    manager.notify_resource_changed("test://binary.bin");
    
    // Check no notification after unsubscribe
    EXPECT_FALSE(notification_received);
    EXPECT_EQ(notification_uri, "");
    
    // Clean up
    manager.unregister_resource("test://binary.bin");
    manager.unregister_resource("file://" + test_file.string());
}

int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}