#include <fstream>
#include <format>
#include "json.hpp"
#include "json_settings.h"

using namespace std;
using json = nlohmann::json;

expected<AppSettings, string> AppSettings::loadAppSettings() {
    constexpr char settings_file[] = "static/settings.json";
    ifstream file(settings_file);
    if (!file.is_open()) {
        return unexpected(format("Failed to open {}",settings_file));
    }

    // Parse the JSON
    json j;
    try {
        file >> j;
    } catch (const json::parse_error& e) {
        return unexpected(format("Failed to parse JSON {}",e.what()));
    }

    if (!j.contains("services") || !j["services"].is_array()) {
        return unexpected("JSON does not contain an array called 'services'");
    }

    AppSettings settings;

    for (const auto& item : j["services"]) {
        if (item.is_array() && item.size() == 2) { 
            Service service = {
                item[0].get<std::string>(), 
                item[1].get<std::string>()
            };
            settings.services.push_back(service);
        }
    }

    if (settings.services.empty()){
        return unexpected("'services' array in JSON file is empty");
    }

    if (j.contains("httpPort")) {
        settings.httpPort = j["httpPort"].get<int>();
    } else {
        settings.httpPort = {};
    }
    
    return settings;
}

optional<std::string> AppSettings::getId(string_view name){
    for (auto& service : services) {
        if(service.name == name) {
            return service.service;
        }
    }
    return {};
}