#include "kappa/service/service.hpp"

#include <format>
#include <sstream>

namespace kappa::service {

std::string generate_s6_service(const ServiceSpec& spec) {
    std::ostringstream out;

    // --- type file content ---
    std::string type_content;
    if (spec.type == "oneshot") {
        type_content = "oneshot";
    } else {
        // "longrun", "notify", and anything else map to longrun in s6
        type_content = "longrun";
    }

    // --- run file content ---
    std::ostringstream run;
    run << s6_execline_shebang;
    run << "# Generated by kappa — do not edit manually\n";
    run << std::format("# s6 service: {}\n", spec.name);

    if (!spec.working_dir.empty()) {
        run << std::format("cd {}\n", spec.working_dir);
    }
    for (const auto& [key, value] : spec.env) {
        run << std::format("export {} \"{}\"\n", key, value);
    }
    if (!spec.user.empty()) {
        run << std::format("s6-setuidgid {}\n", spec.user);
    }
    run << spec.exec << "\n";

    // --- combined output ---
    out << std::format("# --- s6 service directory: {} ---\n", spec.name);
    out << "# file: type\n";
    out << type_content << "\n";
    out << "# file: run\n";
    out << run.str();

    return out.str();
}

} // namespace kappa::service