#pragma once
#include <stdexcept>
#include <string>
#include <nlohmann/json.hpp>

namespace svapi {

enum class ErrCode { BadRequest, Unauthorized, Forbidden, NotFound, Conflict,
                     Unprocessable, TooManyRequests, Unavailable, Internal };

int httpStatus(ErrCode code);

/// `details` is merged into the error object as `error.details` when non-empty.
/// Used for machine-readable payloads (colliding ids, relation impacts) that
/// would otherwise be flattened into the message string.
nlohmann::json errorBody(const std::string& code, const std::string& message,
                         const nlohmann::json& details = nlohmann::json::object());

struct ApiError : std::runtime_error {
    ErrCode code;
    std::string slug;
    nlohmann::json details;   // optional structured payload; empty object = omitted
    ApiError(ErrCode c, std::string slug_, const std::string& msg,
             nlohmann::json det = nlohmann::json::object())
        : std::runtime_error(msg), code(c), slug(std::move(slug_)), details(std::move(det)) {}
};

} // namespace svapi