using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApplication1
{
    public partial class ruudustik : UserControl
    {
        const int N = 4;
        const int D = 20;
        Button[,] kujundid = new Button[N, N];
        public ruudustik()
        {
            InitializeComponent();
            for (int rida = 0; rida < N; rida++) {
                for (int veerg = 0; veerg < N; veerg++) {
                    if (!(rida == N - 1 && veerg == N - 1))
                    {
                        Button kujund = new Button();
                        kujund.Content = rida * N + veerg + 1;
                        kujundid[rida, veerg] = kujund;
                        kujund.Width = D;
                        kujund.Height = D;
                        juur.Children.Add(kujund);
                        Canvas.SetLeft(kujund, veerg * D);
                        Canvas.SetTop(kujund, rida * D);
                        kujund.Click += new RoutedEventHandler(
                               kujund_Click);
//                        kujund.MouseLeftButtonDown += 
//                            new MouseButtonEventHandler(kujund_MouseLeftButtonDown);
                    }
                }
            }
        }


        bool prooviLiikuda(UIElement kujund, int vrida, int vveerg, int rida, int veerg){
            if (rida < 0) { return false; }
            if (rida >= N) { return false; }
            if (veerg < 0) { return false; }
            if (veerg >= N) { return false; }
            if (kujundid[rida, veerg] == null) {
                Canvas.SetLeft(kujund, veerg * D);
                Canvas.SetTop(kujund, rida * D);
                kujundid[rida, veerg] = kujund as Button;
                kujundid[vrida, vveerg] = null;
            }
            return true;
        }

        void kujund_Click(object sender, RoutedEventArgs e)
        {
            UIElement kujund=sender as UIElement;
            int rida = (int)Math.Round(Canvas.GetTop(kujund) / D);
            int veerg = (int)Math.Round(Canvas.GetLeft(kujund) / D);
            prooviLiikuda(kujund, rida, veerg, rida + 1, veerg);
            prooviLiikuda(kujund, rida, veerg, rida - 1, veerg);
            prooviLiikuda(kujund, rida, veerg, rida, veerg+1);
            prooviLiikuda(kujund, rida, veerg, rida, veerg-1);
        }
    }
}