using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using PersonalToolBox.Helpers;
using PersonalToolBox.Models;
using PersonalToolBox.Services;

namespace PersonalToolBox.ViewModels;

/// <summary>
/// 组合编辑窗口 ViewModel，管理一键多开组合的创建与编辑
/// </summary>
public partial class GroupEditViewModel : ObservableObject
{
    private readonly IDataService _dataService;
    private readonly ILogService _logService;
    private readonly ToolItem? _editingGroup;

    // ──────── 可观察属性 ────────

    [ObservableProperty]
    private string _windowTitle = "添加组合";

    [ObservableProperty]
    private string _name = string.Empty;

    [ObservableProperty]
    private string _hotKey = string.Empty;

    [ObservableProperty]
    private Category? _selectedCategory;

    [ObservableProperty]
    private IconProvider.IconOption? _selectedIcon;

    [ObservableProperty]
    private bool _autoRunOnStart;

    /// <summary>
    /// 可供勾选的普通工具列表（IsGroup == false）
    /// </summary>
    public ObservableCollection<SelectableTool> AvailableTools { get; } = new();

    /// <summary>
    /// 分类下拉列表
    /// </summary>
    public ObservableCollection<Category> Categories { get; } = new();

    /// <summary>
    /// 按分类分组的可用图标列表
    /// </summary>
    public ListCollectionView AvailableIconsView { get; }

    public Action<bool?>? CloseAction { get; set; }
    public bool Saved { get; private set; }

    // ──────── 构造 ────────

    public GroupEditViewModel(IDataService dataService, ILogService logService, ToolItem? groupToEdit = null)
    {
        _dataService = dataService;
        _logService = logService;
        _editingGroup = groupToEdit;

        AvailableIconsView = new ListCollectionView(IconProvider.AvailableIcons);
        AvailableIconsView.GroupDescriptions.Add(new PropertyGroupDescription("Category"));

        foreach (var cat in _dataService.Config.Categories)
            Categories.Add(cat);

        // 加载所有工具（排除自身及祖先组合，防止循环引用）
        var excludeIds = GetAncestorIds();
        var selectedIds = _editingGroup?.SubToolIds ?? new List<string>();
        foreach (var tool in _dataService.Config.Tools.Where(t => !excludeIds.Contains(t.Id)))
        {
            AvailableTools.Add(new SelectableTool
            {
                Tool = tool,
                IsSelected = selectedIds.Contains(tool.Id)
            });
        }

        if (groupToEdit != null)
        {
            WindowTitle = "编辑组合";
            Name = groupToEdit.Name;
            HotKey = groupToEdit.HotKey;
            SelectedCategory = Categories.FirstOrDefault(c => c.Id == groupToEdit.CategoryId);
            AutoRunOnStart = groupToEdit.AutoRunOnStart;

            if (!string.IsNullOrEmpty(groupToEdit.IconCode))
            {
                SelectedIcon = IconProvider.AvailableIcons.FirstOrDefault(i => i.Icon.ToString() == groupToEdit.IconCode);
            }
        }
    }

    // ──────── 命令 ────────

    [RelayCommand]
    private void Save()
    {
        try
        {
            if (string.IsNullOrWhiteSpace(Name))
            {
                _logService.Warning("组合名称不能为空");
                return;
            }

            var selectedIds = AvailableTools
                .Where(t => t.IsSelected)
                .Select(t => t.Tool.Id)
                .ToList();

            if (_editingGroup != null)
            {
                _editingGroup.Name = Name.Trim();
                _editingGroup.IconCode = SelectedIcon?.Icon.ToString() ?? string.Empty;
                _editingGroup.HotKey = HotKey.Trim();
                _editingGroup.CategoryId = SelectedCategory?.Id ?? string.Empty;
                _editingGroup.SubToolIds = selectedIds;
                _editingGroup.IsValid = true;
                _editingGroup.AutoRunOnStart = AutoRunOnStart;
                _logService.Info($"已更新组合: {Name.Trim()}（包含 {selectedIds.Count} 个工具）");
            }
            else
            {
                _dataService.Config.Tools.Add(new ToolItem
                {
                    Name = Name.Trim(),
                    IconCode = SelectedIcon?.Icon.ToString() ?? string.Empty,
                    HotKey = HotKey.Trim(),
                    CategoryId = SelectedCategory?.Id ?? string.Empty,
                    IsGroup = true,
                    SubToolIds = selectedIds,
                    IsValid = true,
                    AutoRunOnStart = AutoRunOnStart
                });
                _logService.Info($"已添加组合: {Name.Trim()}（包含 {selectedIds.Count} 个工具）");
            }

            _dataService.Save();
            Saved = true;
            CloseAction?.Invoke(true);
        }
        catch (Exception ex)
        {
            _logService.Error($"保存组合失败: {ex.Message}");
        }
    }

    [RelayCommand]
    private void Cancel()
    {
        CloseAction?.Invoke(false);
    }

    /// <summary>
    /// 获取需要排除的工具 ID 集合（自身 + 所有祖先组合），防止循环引用
    /// </summary>
    private System.Collections.Generic.HashSet<string> GetAncestorIds()
    {
        var ancestors = new System.Collections.Generic.HashSet<string>();
        if (_editingGroup != null)
        {
            ancestors.Add(_editingGroup.Id);
            CollectAncestors(_editingGroup.Id, ancestors);
        }
        return ancestors;
    }

    private void CollectAncestors(string groupId, System.Collections.Generic.HashSet<string> ancestors)
    {
        foreach (var tool in _dataService.Config.Tools.Where(t => t.IsGroup))
        {
            if (tool.SubToolIds.Contains(groupId) && ancestors.Add(tool.Id))
            {
                CollectAncestors(tool.Id, ancestors);
            }
        }
    }
}

/// <summary>
/// 可勾选的工具项（用于 CheckBox 列表绑定）
/// </summary>
public partial class SelectableTool : ObservableObject
{
    public ToolItem Tool { get; set; } = null!;

    [ObservableProperty]
    private bool _isSelected;
}