using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Extensions.DependencyInjection;
using PersonalToolBox.Helpers;
using PersonalToolBox.Models;
using PersonalToolBox.Services;
using PersonalToolBox.Views;

namespace PersonalToolBox.ViewModels;

/// <summary>
/// 主窗口 ViewModel，管理 UI 状态、数据绑定和用户交互逻辑
/// </summary>
public partial class MainViewModel : ObservableObject
{
    private readonly ILogService _logService;
    private readonly IDataService _dataService;
    private readonly IProcessExecutionService _processService;
    private readonly IServiceProvider _serviceProvider;
    private readonly HotKeyManager _hotKeyManager;

    /// <summary>
    /// 全部分类的虚拟对象
    /// </summary>
    private static readonly Category AllCategory = new() { Id = "", Name = "全部" };

    public MainViewModel(
        ILogService logService,
        IDataService dataService,
        IProcessExecutionService processService,
        IServiceProvider serviceProvider,
        HotKeyManager hotKeyManager)
    {
        _logService = logService;
        _dataService = dataService;
        _processService = processService;
        _serviceProvider = serviceProvider;
        _hotKeyManager = hotKeyManager;

        LoadData();
    }

    // ───────────────────────────── 可观察属性 ─────────────────────────────

    [ObservableProperty]
    private string _searchText = string.Empty;

    [ObservableProperty]
    private Category? _selectedCategory;

    public ObservableCollection<LogEntry> Logs => _logService.Logs;

    public ObservableCollection<Category> Categories { get; } = new();

    public ObservableCollection<ToolItem> Tools { get; } = new();

    [ObservableProperty]
    private ObservableCollection<ToolItem> _filteredTools = new();

    [ObservableProperty]
    private string _currentTheme = "Dark";

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

    [RelayCommand]
    private void ClearLogs() => _logService.Clear();

    [RelayCommand]
    private void ToggleTheme()
    {
        CurrentTheme = CurrentTheme == "Dark" ? "Light" : "Dark";
        ThemeHelper.ApplyTheme(CurrentTheme);
        _dataService.Config.Theme = CurrentTheme;
        _dataService.Save();
        _logService.Info($"已切换到{(CurrentTheme == "Dark" ? "暗黑" : "明亮")}主题");
    }

    /// <summary>
    /// 打开添加工具弹窗
    /// </summary>
    [RelayCommand]
    private void AddTool()
    {
        var vm = _serviceProvider.GetRequiredService<ToolEditViewModel>();
        var window = new ToolEditWindow(vm);
        window.ShowDialog();

        if (vm.Saved)
        {
            RefreshData();
        }
    }

    /// <summary>
    /// 打开编辑工具弹窗
    /// </summary>
    [RelayCommand]
    private void EditTool(ToolItem tool)
    {
        if (tool == null) return;

        // 创建编辑 ViewModel（需要新建实例，DI 容器无法区分参数）
        var dataService = _serviceProvider.GetRequiredService<IDataService>();
        var logService = _serviceProvider.GetRequiredService<ILogService>();
        var editVm = new ToolEditViewModel(dataService, logService, tool);
        var window = new ToolEditWindow(editVm);
        window.ShowDialog();

        if (editVm.Saved)
        {
            RefreshData();
        }
    }

    /// <summary>
    /// 执行工具（双击卡片或右键菜单）
    /// </summary>
    [RelayCommand]
    private void ExecuteTool(ToolItem? tool)
    {
        if (tool == null) return;
        _processService.Execute(tool);
    }

    // ───────────────────────────── 分类管理命令 ─────────────────────────────

    /// <summary>
    /// 添加分类
    /// </summary>
    [RelayCommand]
    private void AddCategory()
    {
        var vm = _serviceProvider.GetRequiredService<CategoryEditViewModel>();
        var window = new CategoryEditWindow(vm);
        window.ShowDialog();

        if (vm.Saved) RefreshData();
    }

    /// <summary>
    /// 编辑分类（右键菜单触发）
    /// </summary>
    [RelayCommand]
    private void EditCategory(Category? category)
    {
        if (category == null || string.IsNullOrEmpty(category.Id)) return;

        var dataService = _serviceProvider.GetRequiredService<IDataService>();
        var logService = _serviceProvider.GetRequiredService<ILogService>();
        var editVm = new CategoryEditViewModel(dataService, logService, category);
        var window = new CategoryEditWindow(editVm);
        window.ShowDialog();

        if (editVm.Saved) RefreshData();
    }

    /// <summary>
    /// 删除分类，其下所有工具移入"全部"
    /// </summary>
    [RelayCommand]
    private void DeleteCategory(Category? category)
    {
        if (category == null || string.IsNullOrEmpty(category.Id)) return;

        if (MessageBox.Show(
                $"确定删除分类 \"{category.Name}\" 吗？\n该分类下的所有工具将移入「全部」。",
                "确认删除", MessageBoxButton.YesNo, MessageBoxImage.Warning) != MessageBoxResult.Yes)
            return;

        // 将属于该分类的工具设为"全部"
        foreach (var tool in _dataService.Config.Tools.Where(t => t.CategoryId == category.Id))
            tool.CategoryId = string.Empty;

        // 从配置中移除分类
        _dataService.Config.Categories.Remove(category);
        _dataService.Save();

        _logService.Info($"已删除分类: {category.Name}");
        RefreshData();
    }

    // ───────────────────────────── 数据刷新 ─────────────────────────────

    /// <summary>
    /// 从配置重新加载数据并刷新 UI
    /// </summary>
    public void RefreshData()
    {
        var previousCategoryId = SelectedCategory?.Id;

        Categories.Clear();
        Categories.Add(AllCategory);

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

        Tools.Clear();
        foreach (var tool in _dataService.Config.Tools)
            Tools.Add(tool);

        // 恢复之前选中的分类（若仍存在），否则选中"全部"
        SelectedCategory = Categories.FirstOrDefault(c => c.Id == previousCategoryId) ?? AllCategory;
        ApplyFilter();

        // 工具列表变更后重新注册快捷键
        RegisterAllHotKeys();
    }

    // ───────────────────────────── 快捷键 ─────────────────────────────

    /// <summary>
    /// 注册所有工具的全局快捷键（由 MainWindow.OnSourceInitialized 及数据变更后调用）
    /// </summary>
    public void RegisterAllHotKeys()
    {
        _hotKeyManager.RegisterAll(Tools);
    }

    private void LoadData()
    {
        RefreshData();

        SelectedCategory = AllCategory;
        CurrentTheme = _dataService.Config.Theme;
        ThemeHelper.ApplyTheme(CurrentTheme);
    }

    // ───────────────────────────── 过滤逻辑 ─────────────────────────────

    partial void OnSearchTextChanged(string value) => ApplyFilter();

    partial void OnSelectedCategoryChanged(Category? value) => ApplyFilter();

    private void ApplyFilter()
    {
        var filtered = Tools.AsEnumerable();

        if (SelectedCategory != null && !string.IsNullOrEmpty(SelectedCategory.Id))
            filtered = filtered.Where(t => t.CategoryId == SelectedCategory.Id);

        if (!string.IsNullOrWhiteSpace(SearchText))
            filtered = filtered.Where(t =>
                t.Name.Contains(SearchText, System.StringComparison.OrdinalIgnoreCase));

        FilteredTools = new ObservableCollection<ToolItem>(filtered);
    }
}