using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using FluidExplorer.Navigation;
using FluidExplorer.Services.FileSystem;
using FluidExplorer.Services.Search;
using FluidExplorer.Services.Shell;
using Microsoft.UI.Xaml.Media;

namespace FluidExplorer.ViewModels;

/// <summary>侧边栏的一个节点（可展开的"此电脑"、可收藏的文件夹、驱动器等）。</summary>
public sealed partial class SidebarNode : ObservableObject
{
    [ObservableProperty] private bool _isExpanded;
    [ObservableProperty] private bool _isSelected;

    public SidebarNode(string displayName, string glyph, NavigationLocation location, bool isExpandable = false)
    {
        DisplayName = displayName;
        Glyph = glyph;
        Location = location;
        IsExpandable = isExpandable;
    }

    public string DisplayName { get; }
    public string Glyph { get; }
    public NavigationLocation Location { get; }
    public bool IsExpandable { get; }
    public bool CanPin { get; init; }

    public ObservableCollection<SidebarNode> Children { get; } = [];

    public bool HasUnrealizedChildren { get; set; }

    /// <summary>当前文件夹是否属于该节点（用于侧边栏高亮，对齐资源管理器）。</summary>
    public bool Contains(string path)
    {
        if (string.IsNullOrEmpty(path)) return false;
        if (Location.Kind is LocationKind.ThisPc or LocationKind.RecycleBin or LocationKind.Network or LocationKind.Home)
            return string.Equals(Location.Path, path, StringComparison.OrdinalIgnoreCase);
        var root = Location.Path.TrimEnd('\\');
        return path.StartsWith(root, StringComparison.OrdinalIgnoreCase);
    }

    public static SidebarNode Create(string name, string glyph, NavigationLocation location, bool expandable = false, bool canPin = false)
        => new(name, glyph, location, expandable) { CanPin = canPin };
}

/// <summary>面包屑的一段。</summary>
public sealed partial class BreadcrumbSegment : ObservableObject
{
    public BreadcrumbSegment(string displayName, string path, bool isDriveRoot)
    {
        DisplayName = displayName;
        Path = path;
        IsDriveRoot = isDriveRoot;
    }

    public string DisplayName { get; }
    public string Path { get; }
    public bool IsDriveRoot { get; }
}

/// <summary>搜索结果列表里的一行。</summary>
public sealed partial class SearchResultItem : ObservableObject
{
    private ImageSource? _icon;
    private ImageSource? _thumbnail;

    public SearchResultItem(SearchHit hit) => Hit = hit;

    public SearchHit Hit { get; }
    public string Name => Hit.Name;
    public string Directory => Hit.Directory;
    public string FullPath => Hit.Path;
    public bool IsDirectory => Hit.IsDirectory;
    public long Size => Hit.Size;
    public string SizeText => Hit.Size < 0 ? "—" : Hit.IsDirectory ? string.Empty : Models.FileEntry.FormatSize(Hit.Size);
    public string ModifiedText => Hit.ModifiedUtc == DateTime.MinValue || Hit.ModifiedUtc == default
        ? "—"
        : Hit.ModifiedUtc.ToLocalTime().ToString("yyyy/MM/dd HH:mm");
    public string TypeText => Hit.IsDirectory ? "文件夹" : TypeNameResolver.GetTypeName(Hit.Extension, false);

    public ImageSource? Icon
    {
        get => _icon;
        set { if (!ReferenceEquals(_icon, value)) { _icon = value; OnPropertyChanged(); } }
    }

    public ImageSource? Thumbnail
    {
        get => _thumbnail;
        set { if (!ReferenceEquals(_thumbnail, value)) { _thumbnail = value; OnPropertyChanged(); } }
    }

    public DateTime SortModified => Hit.ModifiedUtc;
}