client/Models/Printer.cs

using CommunityToolkit.Mvvm.ComponentModel;

namespace CloudPrint.Client.Models;

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

public sealed partial class PrinterInfo : ObservableObject
{
    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(DisplayText))]
    private int queueCount;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(DisplayText))]
    private string statusMessage = string.Empty;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(StatusText))]
    [NotifyPropertyChangedFor(nameof(DisplayText))]
    private PrinterStatus status;

    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; }

    partial void OnQueueCountChanged(int value)
    {
        if (value < 0)
        {
            QueueCount = 0;
        }
    }

    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}）";
        }
    }
}