using System;
using Prism.Mvvm;
using System.Linq;
using Prism.Regions;
using Prism.Commands;
using System.Windows.Controls;
using System.Collections.Generic;
using SHJX.Service.Common.Constants;
using SHJX.Service.Common.Interface;
using SHJX.Service.Control.Interface;
using System.Collections.ObjectModel;

namespace SHJX.Service.Shell.ViewModels.Manual
{
    public class ManualWindowViewModel : BindableBase
    {
        #region Fields
        private IRegion _region;
        private readonly ILogService _log;
        private readonly IManualService _service;
        private readonly IRegionManager _regionManager;
        private Dictionary<string, string> _items;
        #endregion

        #region Properties
        public ObservableCollection<TabItem> TabItemInfos { get; init; }
        #endregion

        public ManualWindowViewModel(IRegionManager regionManager, ILogService log, IManualService service)
        {
            _regionManager = regionManager;
            _log = log;
            _service = service;
            TabItemInfos ??= new ObservableCollection<TabItem>();
            InitDataAndBind();
        }

        #region Command 
        private DelegateCommand _loginLoadingCommand;
        public DelegateCommand LoginLoadingCommand => _loginLoadingCommand ??= new DelegateCommand(ExecuteLoginLoadingCommand);
        private DelegateCommand<string> _menuSelectionChangedCommand;
        public DelegateCommand<string> MenuSelectionChangedCommand => _menuSelectionChangedCommand ??= new DelegateCommand<string>(ExecuteMenuSelectionChangedCommand);
        private DelegateCommand _closingCommand;
        public DelegateCommand ClosingCommand => _closingCommand ??= new DelegateCommand(() =>
        {
            _regionManager.Regions.Remove(RegionNames.ManualRegion);//关闭窗体之前先移除注册项
        });
        #endregion

        #region Execute
        void ExecuteLoginLoadingCommand()
        {
            try
            {
                _region = _regionManager.Regions[RegionNames.ManualRegion];
                _region.RequestNavigate(_items.FirstOrDefault().Value);
            }
            catch (Exception ex)
            {
                _log.ErrorFormat(ex.ToString());
            }
        }

        public void ExecuteMenuSelectionChangedCommand(string elementName)
        {
            try
            {
                if (_items.TryGetValue(elementName, out var value))
                {
                    _region.RequestNavigate(value);
                }
            }
            catch (Exception ex)
            {
                _log.ErrorFormat(ex.ToString());
            }
        }
        #endregion

        #region Method
        private void InitDataAndBind()
        {
            _items = _service.ManualTabItems;
            foreach (string item in _items.Keys)
            {
                TabItem tab = new()
                {
                    Header = item
                };
                TabItemInfos.Add(tab);
            }
        }
        #endregion
    }
}