#pragma once

#include <string>
#include <fstream>
#include <iostream>
#include <cstdlib>

#include "common.hpp"

struct ServerConfig {
    std::string address;
    int port;
    int threads;
};

struct DatabaseConfig {
    std::string host;
    int port;
    std::string dbname;
    std::string user;
    std::string password;
};

struct AppConfig {
    ServerConfig server;
    DatabaseConfig database;
    
    static AppConfig loadFromFile(const std::string& filename) {
        std::ifstream file(filename);
        if (!file.is_open()) {
            throw std::runtime_error("Cannot open config file: " + filename);
        }
        
        json j;
        file >> j;
        
        AppConfig config;
        config.server.address = j.at("server").at("address");
        config.server.port = j.at("server").at("port");
        config.server.threads = j.at("server").at("threads");
        config.database.host = j.at("database").value("host", "localhost");
        config.database.port = j.at("database").value("port", 5432);
        config.database.dbname = j.at("database").value("dbname", "");
        config.database.user = j.at("database").value("user", "");
        config.database.password = j.at("database").value("password", "");

        // Environment variables override config file
        if (const char* val = std::getenv("DB_HOST"))     config.database.host = val;
        if (const char* val = std::getenv("DB_PORT"))     config.database.port = std::stoi(val);
        if (const char* val = std::getenv("DB_NAME"))     config.database.dbname = val;
        if (const char* val = std::getenv("DB_USER"))     config.database.user = val;
        if (const char* val = std::getenv("DB_PASSWORD")) config.database.password = val;
        
        return config;
    }
};