#ifndef HUMANUS_TOOL_BASE_H
#define HUMANUS_TOOL_BASE_H

#include "toml.hpp"
#include "../schema.h"
#include "../agent/base.h"
#include "../mcp/include/mcp_client.h"
#include "../mcp/include/mcp_stdio_client.h"
#include "../mcp/include/mcp_sse_client.h"
#include <string>

namespace humanus {

// Execute the tool with given parameters.
struct BaseTool {
    std::string name;
    std::string description;
    json parameters;

    std::unique_ptr<mcp::client> _client;

    BaseTool(const std::string& name, const std::string& description, const json& parameters) :
        name(name), description(description), parameters(parameters) {
        // 从配置文件加载工具配置
        auto _config = MCPToolConfig::load_from_toml(name);

        if (_config.type == "stdio") {
            std::string command = _config.command;
            if (!_config.args.empty()) {
                for (const auto& arg : _config.args) {
                    command += " " + arg;
                }
            }
            _client = std::make_unique<mcp::stdio_client>(command, _config.env_vars);
        } else if (_config.type == "sse") {
            if (!_config.host.empty() && !_config.port.empty()) {
                _client = std::make_unique<mcp::sse_client>(_config.host, _config.port);
            } else if (!_config.url.empty()) {
                _client = std::make_unique<mcp::sse_client>(_config.url);
            } else {
                throw std::runtime_error("MCP SSE 配置缺少 host 或 port 或 url");
            }
        }

        _client->initialize(name + "_client", "0.0.1");
    }

    // Execute the tool with given parameters.
    ToolResult operator()(const json& arguments) {
        return execute(arguments);
    }
    
    // Execute the tool with given parameters.
    virtual ToolResult execute(const json& arguments) {
        try {
            if (!_client) {
                throw std::runtime_error("MCP 客户端未初始化");
            }
            json result = _client->call_tool(name, arguments);
            bool is_error = result.value("isError", false);
            // 根据是否有错误返回不同的ToolResult
            if (is_error) {
                return ToolError(result.value("content", json::array()));
            } else {
                return ToolResult(result.value("content", json::array()));
            }
        } catch (const std::exception& e) {
            return ToolError(e.what());
        }
    }

    json to_param() const {
        return {
            {"type", "function"},
            {"function", {
                {"name", name},
                {"description", description},
                {"parameters", parameters}
            }}
        };
    }
};

// Represents the result of a tool execution.
struct ToolResult {
    json output;
    json error;
    json system;

    ToolResult(const json& output, const json& error = {}, const json& system = {}) 
        : output(output), error(error), system(system) {}

    bool empty() const {
        return output.empty() && error.empty() && system.empty();
    }

    ToolResult operator+(const ToolResult& other) const {
        auto combined_field = [](const json& field, const json& other_field) {
            if (field.empty()) {
                return other_field;
            }
            if (other_field.empty()) {
                return field;
            }
            json result = json::array();
            if (field.is_array()) {
                result.insert(result.end(), field.begin(), field.end());
            } else  {
                result.push_back(field);
            }
            if (other_field.is_array()) {
                result.insert(result.end(), other_field.begin(), other_field.end());
            } else  {
                result.push_back(other_field);
            }
            return result;
        };

        return {
            combined_field(output, other.output),
            combined_field(error, other.error),
            combined_field(system, other.system)
        };
    }

    std::string to_string() const {
        return !error.empty() ? "Error: " + error.dump() : output.dump();
    }
};

// A ToolResult that represents a failure.
struct ToolError : ToolResult {
    ToolError(const std::string& error) : ToolResult({}, error) {}
};

struct AgentAware : ToolResult {
    std::shared_ptr<BaseAgent> agent = nullptr;
};

// 从config_mcp.toml中读取工具配置
struct MCPToolConfig {
    std::string type;
    std::string host;
    std::string port; 
    std::string url;
    std::string command;
    std::vector<std::string> args;
    json env_vars = json::object();
    
    static MCPToolConfig load_from_toml(const std::string& tool_name) {
        MCPToolConfig config;
        
        try {
            // 获取配置文件路径
            auto config_path = PROJECT_ROOT / "config" / "config_mcp.toml";
            if (!std::filesystem::exists(config_path)) {
                throw std::runtime_error("找不到MCP配置文件: " + config_path.string());
            }
            
            // 解析TOML文件
            const auto& data = toml::parse_file(config_path.string());
            
            // 检查工具配置是否存在
            if (!data.contains(tool_name) || !data[tool_name].is_table()) {
                throw std::runtime_error("MCP配置文件中找不到工具配置: " + tool_name);
            }
            
            const auto& tool_table = *data[tool_name].as_table();

            // 读取类型
            if (!tool_table.contains("type") || !tool_table["type"].is_string()) {
                throw std::runtime_error("工具配置缺少type字段: " + tool_name);
            }
            config.type = tool_table["type"].as_string()->get();

            if (config.type == "stdio") {
                // 读取命令
                if (!tool_table.contains("command") || !tool_table["command"].is_string()) {
                    throw std::runtime_error("stdio类型工具配置缺少command字段: " + tool_name);
                }
                config.command = tool_table["command"].as_string()->get();
                
                // 读取参数（如果有）
                if (tool_table.contains("args") && tool_table["args"].is_array()) {
                    const auto& args_array = *tool_table["args"].as_array();
                    for (const auto& arg : args_array) {
                        if (arg.is_string()) {
                            config.args.push_back(arg.as_string()->get());
                        }
                    }
                }
                
                // 读取环境变量
                std::string env_section = tool_name + ".env";
                if (data.contains(env_section) && data[env_section].is_table()) {
                    const auto& env_table = *data[env_section].as_table();
                    for (const auto& [key, value] : env_table) {
                        if (value.is_string()) {
                            config.env_vars[key] = value.as_string()->get();
                        } else if (value.is_integer()) {
                            config.env_vars[key] = value.as_integer()->get();
                        } else if (value.is_floating_point()) {
                            config.env_vars[key] = value.as_floating_point()->get();
                        } else if (value.is_boolean()) {
                            config.env_vars[key] = value.as_boolean()->get();
                        }
                    }
                }
            } else if (config.type == "sse") {
                // 读取host和port或url
                if (tool_table.contains("url") && tool_table["url"].is_string()) {
                    config.url = tool_table["url"].as_string()->get();
                } else {
                    if (!tool_table.contains("host") || !tool_table["host"].is_string()) {
                        throw std::runtime_error("sse类型工具配置缺少host字段: " + tool_name);
                    }
                    config.host = tool_table["host"].as_string()->get();

                    if (!tool_table.contains("port") || !tool_table["port"].is_string()) {
                        throw std::runtime_error("sse类型工具配置缺少port字段: " + tool_name);
                    }
                    config.port = tool_table["port"].as_string()->get();
                }
            } else {
                throw std::runtime_error("不支持的工具类型: " + config.type);
            }
        } catch (const std::exception& e) {
            std::cerr << "加载MCP工具配置失败: " << e.what() << std::endl;
            throw;
        }
        
        return config;
    }
};

}

#endif // HUMANUS_TOOL_BASE_H