using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Windows;
using MAX.Core.Logger;
using Prism.Commands;
using Prism.Mvvm;
using Trade.Framework.Services;

namespace Main.Test.ViewModels;

internal class MainViewModel : BindableBase
{
    private List<ItemInfo> data = DemoData.Create(10000);
    public List<ItemInfo> Data { get => data; private set => SetProperty(ref data, value); }
    private string actionMessage = "可右键查看详情、复制编码或切换状态；默认加载 10,000 行。";
    public string ActionMessage { get => actionMessage; private set => SetProperty(ref actionMessage, value); }
    private ObservableCollection<ItemInfo> selectedItems = new();
    public ObservableCollection<ItemInfo> SelectedItems
    {
        get => selectedItems;
        set
        {
            ArgumentNullException.ThrowIfNull(value);
            if (ReferenceEquals(selectedItems, value)) return;
            selectedItems.CollectionChanged -= SelectionChanged;
            SetProperty(ref selectedItems, value);
            selectedItems.CollectionChanged += SelectionChanged;
            RaisePropertyChanged(nameof(SelectedCount));
        }
    }
    public int SelectedCount => SelectedItems.Count;
    public int NetworkImageSize { get; set; }
    public DelegateCommand<ItemInfo> DetailCommand { get; }
    public DelegateCommand<ItemInfo> ConfirmCommand { get; }
    public DelegateCommand<ItemInfo> CopyCodeCommand { get; }

    public MainViewModel(ILoggerFacade logger, UserManager userManager)
    {
        selectedItems.CollectionChanged += SelectionChanged;
        DetailCommand = new(item => { if (item != null) ActionMessage = $"详情：{item.Code} · {item.Name} · ¥{item.Value} · {item.Buyer} · {item.Status}"; });
        ConfirmCommand = new(item =>
        {
            if (item == null) return;
            item.Status = item.Status == "已确认" ? "待处理" : "已确认";
            ActionMessage = $"已更新 {item.Code}：{item.Status}";
        });
        CopyCodeCommand = new(item =>
        {
            if (item == null) return;
            try { Clipboard.SetText(item.Code.ToString()); ActionMessage = $"已复制编码 {item.Code}"; }
            catch (System.Runtime.InteropServices.ExternalException) { ActionMessage = "剪贴板正忙，请重试。"; }
        });
    }
    private void SelectionChanged(object? sender, NotifyCollectionChangedEventArgs e) => RaisePropertyChanged(nameof(SelectedCount));

    public async Task LoadAsync(int count)
    {
        if (count is < 1 or > 50000) throw new ArgumentOutOfRangeException(nameof(count));
        var imageSize = NetworkImageSize;
        var rows = await Task.Run(() => DemoData.Create(count, imageSize));
        SelectedItems.Clear(); Data = rows;
        ActionMessage = $"已加载 {count:N0} 行；" + (imageSize == 0 ? "本地缩略图。" : $"Picsum {imageSize}×{imageSize} 网络随机图，可见时加载。每次重新加载使用新种子。冷 / 热测试以当前页面已加载状态为准。");
    }
}