#include "kappa/service/service.hpp"

#include <format>
#include <sstream>

namespace kappa::service {

std::string generate_systemd_service(const ServiceSpec& spec) {
    std::ostringstream out;

    // --- [Unit] ---
    out << "[Unit]\n";
    out << std::format("Description={}\n",
                       spec.description.empty() ? spec.name : spec.description);
    if (!spec.after.empty()) {
        out << std::format("After={}\n", spec.after);
    }

    // --- [Service] ---
    out << "\n[Service]\n";
    out << std::format("ExecStart={}\n", spec.exec);

    if (spec.type == "simple") {
        out << "Type=simple\n";
    } else if (spec.type == "forking") {
        out << "Type=forking\n";
    } else if (spec.type == "oneshot") {
        out << "Type=oneshot\n";
    } else if (spec.type == "notify") {
        out << "Type=notify\n";
    } else {
        out << "Type=simple\n";
    }

    if (!spec.user.empty()) {
        out << std::format("User={}\n", spec.user);
    }

    if (spec.restart_policy == "always") {
        out << "Restart=always\n";
    } else if (spec.restart_policy == "on-failure") {
        out << "Restart=on-failure\n";
    } else if (spec.restart_policy == "never") {
        out << "Restart=no\n";
    }

    if (!spec.working_dir.empty()) {
        out << std::format("WorkingDirectory={}\n", spec.working_dir);
    }

    for (const auto& [key, value] : spec.env) {
        out << std::format("Environment=\"{0}={1}\"\n", key, value);
    }

    // --- [Install] ---
    out << "\n[Install]\n";
    out << "WantedBy=multi-user.target\n";

    return out.str();
}

} // namespace kappa::service