#pragma once

namespace lidarlib {

// Result of open() and the sticky status behind last_error(). Ok == 0 so
// `if (err != ErrorCode::Ok)` reads naturally at call sites.
enum class ErrorCode {
    Ok = 0,

    // Lifecycle misuse — the call was refused, the instance state is unchanged.
    AlreadyOpen,          // open() called while already open
    NotOpen,              // recv_scan()/spin_once() called before open()

    // open() failures
    SocketError,          // socket() creation failed
    InvalidAddress,       // ip string is not a valid IPv4 address
    PortInUse,            // bind: local port already taken (EADDRINUSE/EACCES)
    BindFailed,           // bind failed for another reason
    ConnectionRefused,    // TCP connect refused (device up, port closed)
    ConnectionFailed,     // TCP connect failed (unreachable, no route, ...)
    HandshakeFailed,      // connected, but the start-stream command failed

    // Runtime failures
    Timeout,              // no (complete) scan within timeout_ms
    DeviceDisconnected,   // peer closed the connection / socket recv error
};

inline const char* to_string(ErrorCode e) {
    switch (e) {
        case ErrorCode::Ok:                 return "Ok";
        case ErrorCode::AlreadyOpen:        return "AlreadyOpen";
        case ErrorCode::NotOpen:            return "NotOpen";
        case ErrorCode::SocketError:        return "SocketError";
        case ErrorCode::InvalidAddress:     return "InvalidAddress";
        case ErrorCode::PortInUse:          return "PortInUse";
        case ErrorCode::BindFailed:         return "BindFailed";
        case ErrorCode::ConnectionRefused:  return "ConnectionRefused";
        case ErrorCode::ConnectionFailed:   return "ConnectionFailed";
        case ErrorCode::HandshakeFailed:    return "HandshakeFailed";
        case ErrorCode::Timeout:            return "Timeout";
        case ErrorCode::DeviceDisconnected: return "DeviceDisconnected";
    }
    return "Unknown";
}

} // namespace lidarlib