using AuroraDesk.Core.Interfaces;
using AuroraDesk.Core.Entities;
using HeroIconsAvalonia.Enums;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using ReactiveUI;
using System;
using System.Collections.ObjectModel;

namespace AuroraDesk.Infrastructure.Services;

/// <summary>
/// 导航服务实现
/// </summary>
public class NavigationService : INavigationService
{
    private readonly IPageViewModelFactory _pageViewModelFactory;
    private readonly IResourceService? _resourceService;
    private readonly ILogger<NavigationService>? _logger;

    public NavigationService(
        IPageViewModelFactory pageViewModelFactory,
        IResourceService? resourceService = null,
        ILogger<NavigationService>? logger = null)
    {
        _pageViewModelFactory = pageViewModelFactory;
        _resourceService = resourceService;
        _logger = logger;
    }

    public ObservableCollection<NavigationItem> GetNavigationItems(IScreen screen)
    {
        var navigationItems = new ObservableCollection<NavigationItem>
        {
            new NavigationItem 
            { 
                Id = "dashboard", 
                Title = _resourceService?.GetString("NavDashboard") ?? "仪表板", 
                IconType = IconType.Home,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("dashboard", screen)
            },
            new NavigationItem 
            { 
                Id = "users", 
                Title = _resourceService?.GetString("NavUsers") ?? "用户管理", 
                IconType = IconType.Users,
                Children = new ObservableCollection<NavigationItem>
                {
                    new NavigationItem 
                    { 
                        Id = "users-list", 
                        Title = "用户列表", 
                        IconType = IconType.UserGroup,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("users-list", screen)
                    },
                    new NavigationItem 
                    { 
                        Id = "users-roles", 
                        Title = "角色管理", 
                        IconType = IconType.ShieldCheck,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("users-roles", screen)
                    },
                    new NavigationItem 
                    { 
                        Id = "users-permissions", 
                        Title = "权限设置", 
                        IconType = IconType.Key,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("users-permissions", screen)
                    }
                }
            },
            new NavigationItem 
            { 
                Id = "settings", 
                Title = _resourceService?.GetString("NavSettings") ?? "系统设置", 
                IconType = IconType.Cog6Tooth,
                Children = new ObservableCollection<NavigationItem>
                {
                    new NavigationItem 
                    { 
                        Id = "settings-general", 
                        Title = "常规设置", 
                        IconType = IconType.Cog,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("settings-general", screen)
                    },
                    new NavigationItem 
                    { 
                        Id = "settings-security", 
                        Title = "安全设置", 
                        IconType = IconType.LockClosed,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("settings-security", screen)
                    },
                    new NavigationItem 
                    { 
                        Id = "settings-backup", 
                        Title = "备份恢复", 
                        IconType = IconType.CloudArrowUp,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("settings-backup", screen)
                    }
                }
            },
            new NavigationItem 
            { 
                Id = "reports", 
                Title = _resourceService?.GetString("NavReports") ?? "报表统计", 
                IconType = IconType.ChartBar,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("reports", screen)
            },
            new NavigationItem 
            { 
                Id = "help", 
                Title = _resourceService?.GetString("NavHelp") ?? "帮助中心", 
                IconType = IconType.QuestionMarkCircle,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("help", screen)
            },
            new NavigationItem
            {
                Id = "dialog-host",
                Title = "对话框示例",
                IconType = IconType.ChatBubbleLeftRight,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("dialog-host", screen)
            },
            new NavigationItem 
            { 
                Id = "icons", 
                Title = _resourceService?.GetString("NavIcons") ?? "图标库", 
                IconType = IconType.Sparkles,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("icons", screen)
            },
            new NavigationItem 
            { 
                Id = "editor", 
                Title = "代码编辑器", 
                IconType = IconType.CodeBracket,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("editor", screen)
            },
            new NavigationItem 
            { 
                Id = "image-gallery", 
                Title = "图片浏览", 
                IconType = IconType.Photo,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("image-gallery", screen)
            },
            new NavigationItem 
            { 
                Id = "udp-tools", 
                Title = "UDP 工具", 
                IconType = IconType.Signal,
                Children = new ObservableCollection<NavigationItem>
                {
                    new NavigationItem 
                    { 
                        Id = "udp-client", 
                        Title = "UDP 客户端", 
                        IconType = IconType.ArrowRight,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("udp-client", screen)
                    },
                    new NavigationItem 
                    { 
                        Id = "udp-server", 
                        Title = "UDP 服务端", 
                        IconType = IconType.Server,
                        ViewModel = _pageViewModelFactory.CreatePageViewModel("udp-server", screen)
                    }
                }
            },
            new NavigationItem 
            { 
                Id = "node-canvas", 
                Title = "节点编辑器", 
                IconType = IconType.SquaresPlus,
                ViewModel = _pageViewModelFactory.CreatePageViewModel("node-canvas", screen)
            }
        };

        _logger?.LogInformation("导航项已初始化，共 {Count} 项", navigationItems.Count);
        return navigationItems;
    }

    public void NavigateToPage(NavigationItem item)
    {
        if (item?.ViewModel == null)
        {
            _logger?.LogWarning("导航项或 ViewModel 为空，无法导航");
            return;
        }

        try
        {
            // 优化：如果当前 Router 已经显示的是这个 ViewModel，跳过导航避免重复渲染
            if (item.ViewModel.HostScreen.Router.CurrentViewModel == item.ViewModel)
            {
                _logger?.LogDebug("页面已在当前视图，跳过导航: {Title} ({Id})", item.Title, item.Id);
                return;
            }
            
            // 从 ViewModel 获取 HostScreen 进行导航
            item.ViewModel.HostScreen.Router.Navigate.Execute(item.ViewModel);
            _logger?.LogInformation("导航到页面: {Title} ({Id})", item.Title, item.Id);
        }
        catch (Exception ex)
        {
            _logger?.LogError(ex, "导航到页面失败: {Title}", item.Title);
        }
    }
}