client/Models/Printer.cs

using CloudPrint.Client.Infrastructure;

namespace CloudPrint.Client.Models;

public enum PrinterStatus
{
    Idle = 0,
    Printing = 1,
    Offline = 2,
    Error = 3,
    Unknown = 99
}

public sealed class PrinterInfo : ObservableObject
{
    private PrinterStatus _status;
    private int _queueCount;
    private string _statusMessage = string.Empty;

    public int Id { get; init; }
    public string Name { get; init; } = string.Empty;
    public string DisplayName { get; init; } = string.Empty;
    public bool IsActive { get; init; } = true;
    public string ApiKey { get; init; } = string.Empty;
    public DateTime? LastHeartbeat { get; set; }

    public int QueueCount
    {
        get => _queueCount;
        set
        {
            if (SetProperty(ref _queueCount, Math.Max(0, value)))
            {
                OnPropertyChanged(nameof(DisplayText));
            }
        }
    }

    public string StatusMessage
    {
        get => _statusMessage;
        set
        {
            if (SetProperty(ref _statusMessage, value))
            {
                OnPropertyChanged(nameof(DisplayText));
            }
        }
    }

    public PrinterStatus Status
    {
        get => _status;
        set
        {
            if (SetProperty(ref _status, value))
            {
                OnPropertyChanged(nameof(StatusText));
                OnPropertyChanged(nameof(DisplayText));
            }
        }
    }

    public string StatusText => Status switch
    {
        PrinterStatus.Idle => "空闲",
        PrinterStatus.Printing => "打印中",
        PrinterStatus.Offline => "离线",
        PrinterStatus.Error => "异常",
        _ => "未知"
    };

    public string DisplayText
    {
        get
        {
            var queueText = QueueCount > 0 ? $"，队列 {QueueCount}" : string.Empty;
            var messageText = string.IsNullOrWhiteSpace(StatusMessage) ? string.Empty : $"，{StatusMessage}";
            return $"{DisplayName}（{StatusText}{queueText}{messageText}）";
        }
    }
}