using System.Collections.ObjectModel;
using System.Windows;
using Prism.Commands;
using YY.Admin.Core.Entity;
using YY.Admin.Core.Services;
using YY.Admin.Services.Service.Print;
using YY.Admin.Core;

namespace YY.Admin.ViewModels.Print;

public class PrintSettingsViewModel : BaseViewModel
{
    private readonly IPrintDotService _printDotService;
    private readonly IPrintTemplateService _printTemplateService;

    // ── 连接设置 ──────────────────────────────────────────────────────────

    private string _wsUrl = "ws://127.0.0.1:1122/ws";
    public string WsUrl
    {
        get => _wsUrl;
        set => SetProperty(ref _wsUrl, value);
    }

    // ── 打印机列表 ──────────────────────────────────────────────────────────

    public ObservableCollection<PrintDotPrinter> Printers { get; } = new();

    private PrintDotPrinter? _selectedPrinter;
    public PrintDotPrinter? SelectedPrinter
    {
        get => _selectedPrinter;
        set => SetProperty(ref _selectedPrinter, value);
    }

    // ── 模板列表 ────────────────────────────────────────────────────────────

    public ObservableCollection<PrintTemplate> Templates { get; } = new();

    // ── 状态 ────────────────────────────────────────────────────────────────

    private bool _isBusy;
    public bool IsBusy
    {
        get => _isBusy;
        set => SetProperty(ref _isBusy, value);
    }

    private string _statusMessage = string.Empty;
    public string StatusMessage
    {
        get => _statusMessage;
        set => SetProperty(ref _statusMessage, value);
    }

    // ── 命令 ────────────────────────────────────────────────────────────────

    public DelegateCommand TestConnectionCommand { get; }
    public DelegateCommand SaveCommand { get; }
    public DelegateCommand RefreshTemplatesCommand { get; }

    public PrintSettingsViewModel(
        IPrintDotService printDotService,
        IPrintTemplateService printTemplateService,
        IContainerExtension container,
        IRegionManager regionManager) : base(container, regionManager)
    {
        _printDotService = printDotService;
        _printTemplateService = printTemplateService;

        TestConnectionCommand    = new DelegateCommand(async () => await TestConnectionAsync());
        SaveCommand              = new DelegateCommand(SaveSettings);
        RefreshTemplatesCommand  = new DelegateCommand(async () => await RefreshTemplatesAsync());

        // 加载已保存的设置
        var saved = PrintDotSettings.Load();
        WsUrl = saved.WsUrl;
        if (!string.IsNullOrWhiteSpace(saved.SelectedPrinter))
            _selectedPrinter = new PrintDotPrinter(saved.SelectedPrinter, false);
    }

    private async Task TestConnectionAsync()
    {
        IsBusy = true;
        StatusMessage = "正在连接...";
        Printers.Clear();
        try
        {
            // 临时用当前输入的 URL 测试
            PrintDotSettings.Current!.WsUrl = WsUrl;
            var list = await _printDotService.GetPrintersAsync();
            foreach (var p in list) Printers.Add(p);

            // 还原保存的已选打印机
            var saved = PrintDotSettings.Load();
            var match = list.FirstOrDefault(p => p.Name == saved.SelectedPrinter);
            SelectedPrinter = match ?? (list.Count > 0 ? list[0] : null);

            StatusMessage = $"连接成功，共 {list.Count} 台打印机";
        }
        catch (Exception ex)
        {
            StatusMessage = $"连接失败：{ex.Message}";
        }
        finally
        {
            IsBusy = false;
        }
    }

    private void SaveSettings()
    {
        var settings = new PrintDotSettings
        {
            WsUrl = WsUrl.Trim(),
            SelectedPrinter = SelectedPrinter?.Name ?? string.Empty
        };
        settings.Save();
        StatusMessage = "设置已保存";
        MessageBox.Show("PrintDot 设置已保存", "保存成功", MessageBoxButton.OK, MessageBoxImage.Information);
    }

    private async Task RefreshTemplatesAsync()
    {
        IsBusy = true;
        Templates.Clear();
        try
        {
            var list = await _printTemplateService.ListAsync();
            foreach (var t in list) Templates.Add(t);
            StatusMessage = $"已加载 {list.Count} 个打印模板";
        }
        catch (Exception ex)
        {
            StatusMessage = $"加载模板失败：{ex.Message}";
        }
        finally
        {
            IsBusy = false;
        }
    }
}