using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.ExceptionServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using Dragablz;
using Dragablz.Dockablz;

namespace DragablzDemo
{
    public class LayoutManagementExampleViewModel
    {
        private readonly ICommand _queryLayoutsCommand;
        private readonly TreeNode _rootNode;

        public LayoutManagementExampleViewModel()
        {
            _queryLayoutsCommand = new AnotherCommandImplementation(x => QueryLayouts());
            _rootNode = new TreeNode
            {
                Content = "Application"
            };
        }

        public ICommand QueryLayoutsCommand
        {
            get { return _queryLayoutsCommand; }
        }

        public IEnumerable<TreeNode> RootNodes
        {
            get { return new [] {_rootNode}; }
        }

        private void QueryLayouts()
        {
            _rootNode.Children.Clear();

            foreach (var layout in Application.Current.Windows.OfType<BoundExampleWindow>().Select(w => w.RootLayout))
            {
                var layoutAccessor = layout.Query();
                var layoutNode = new TreeNode
                {
                    Content = "Layout"
                };
                _rootNode.Children.Add(layoutNode);

                FloatingItemsVisitor(layoutNode, layoutAccessor);
                layoutAccessor.Visit(layoutNode, BranchAccessorVisitor, TabablzControlVisitor);
            }
        }

        private static void FloatingItemsVisitor(TreeNode layoutNode, LayoutAccessor layoutAccessor)
        {
            var floatingItems = layoutAccessor.FloatingItems.ToList();
            var floatingItemsNode = new TreeNode {Content = "Floating Items " + floatingItems.Count};            
            foreach (var floatingItemNode in floatingItems.Select(floatingItem => new TreeNode
            {
                Content =
                    string.Format("Floating Item {0}, {1} : {2}, {3}", floatingItem.X, floatingItem.Y,
                        floatingItem.ActualWidth, floatingItem.ActualHeight)
            }))
            {
                floatingItemsNode.Children.Add(floatingItemNode);
            }

            layoutNode.Children.Add(floatingItemsNode);
        }

        private static void TabablzControlVisitor(TreeNode treeNode, TabablzControl tabablzControl)
        {
            treeNode.Children.Add(new TreeNode { Content = new TabablzControlProxy(tabablzControl) });            
        }

        private static void BranchAccessorVisitor(TreeNode treeNode, BranchAccessor branchAccessor)
        {
            var branchNode = new TreeNode {Content = "Branch " + branchAccessor.Branch.Orientation};
            treeNode.Children.Add(branchNode);

            var firstBranchNode = new TreeNode { Content = "Branch Item 1. Ratio=" + branchAccessor.Branch.GetFirstProportion() };
            branchNode.Children.Add(firstBranchNode);
            var secondBranchNode = new TreeNode { Content = "Branch Item 2. Ratio=" + (1 - branchAccessor.Branch.GetFirstProportion()) };
            branchNode.Children.Add(secondBranchNode);

            branchAccessor
                .Visit(firstBranchNode, BranchItem.First, BranchAccessorVisitor, TabablzControlVisitor)
                .Visit(secondBranchNode, BranchItem.Second, BranchAccessorVisitor, TabablzControlVisitor);
        }
    }
}