using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using TeamAAS.FlowEngine.Execution;

namespace TeamAAS.FlowEditor
{
    /// <summary>
    /// 流程编辑器外壳视图：多 Tab 管理
    /// </summary>
    public partial class FlowEditorShellView : UserControl
    {
        private FlowEditorShellViewModel _vm;

        public FlowEditorShellView()
        {
            InitializeComponent();
            Loaded += OnLoaded;
        }

        private void OnLoaded(object sender, RoutedEventArgs e)
        {
            _vm = DataContext as FlowEditorShellViewModel;
            if (_vm == null)
            {
                _vm = new FlowEditorShellViewModel();
                DataContext = _vm;
            }
        }

        #region Tab管理
        private void TabItem_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (sender is FrameworkElement fe && fe.DataContext is FlowTabItem tab)
            {
                if (e.ClickCount == 2)
                {
                    if (_vm?.IsReadOnly == true) { e.Handled = true; return; } // 只读监控禁重命名
                    _vm?.RenameFlowCommand.Execute(tab);
                    e.Handled = true;
                }
                else if (_vm != null && _vm.ActiveTab != tab)
                {
                    _vm.ActiveTab = tab;
                }
            }
        }

        private void TabClose_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            e.Handled = true;
            if (_vm?.IsReadOnly == true) return; // 只读监控禁关闭流程
            if (sender is FrameworkElement fe && fe.DataContext is FlowTabItem tab)
            {
                _vm?.CloseFlowCommand.Execute(tab);
            }
        }

        private void TabItem_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (sender is FrameworkElement fe && fe.DataContext is FlowTabItem tab)
            {
                if (_vm != null && _vm.ActiveTab != tab)
                    _vm.ActiveTab = tab;

                var readOnly = _vm?.IsReadOnly == true;
                var menu = new ContextMenu();
                var itemProps = new MenuItem { Header = "属性设置", IsEnabled = !readOnly };
                itemProps.Click += (s, args) => _vm?.OpenTabPropertiesCommand.Execute(tab);
                var itemRename = new MenuItem { Header = "重命名", IsEnabled = !readOnly };
                itemRename.Click += (s, args) => _vm?.RenameFlowCommand.Execute(tab);
                var itemImport = new MenuItem { Header = "导入流程...", IsEnabled = !readOnly };
                itemImport.Click += (s, args) => _vm?.ImportFlowCommand.Execute();
                var itemExport = new MenuItem { Header = "导出流程..." };
                itemExport.Click += (s, args) => _vm?.ExportFlowCommand.Execute();
                menu.Items.Add(itemProps);
                menu.Items.Add(new Separator());
                menu.Items.Add(itemRename);
                menu.Items.Add(new Separator());
                menu.Items.Add(itemImport);
                menu.Items.Add(itemExport);
                menu.IsOpen = true;
                e.Handled = true;
            }
        }
        #endregion
    }
}