using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Threading;

namespace Factorizator
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        #region Error variable
        private bool error = false;
        private bool Error
        {
            get { return error; }
            set
            {
                error = value;
                inputNumber.Background = (value) ? (Brushes.Pink) : (Brushes.White);
            }
        }
        #endregion

        #region Vars
        Thread worker = null;
        #endregion

        #region Constructor
        public MainWindow()
        {
            InitializeComponent();
        }
        #endregion

        #region Keyboard handler
        private void Window_KeyDown(object sender, KeyEventArgs e)
        {
            e.Handled = true;
            var text = Keyboard.FocusedElement as TextBox;

            if (e.KeyboardDevice.Modifiers == ModifierKeys.None)
            {
                switch (e.Key)
                {
                    case Key.Enter: buttonCalculate_Click(this, new RoutedEventArgs()); break;
                    case Key.Escape: statusCancel_Click(this, new RoutedEventArgs()); break;
                    case Key.F1: DynamicLink.Launcher.StartModule("Help", "factorizator"); break;
                    default: e.Handled = false; break;
                }
            }

            else if (text == null && e.KeyboardDevice.Modifiers == ModifierKeys.Control && e.Key == Key.C)
                contextCopyRem_Click(this, new RoutedEventArgs());

            else if (text == null && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift) && e.Key == Key.C)
                contextCopyDiv_Click(this, new RoutedEventArgs());

            else e.Handled = false;
        }
        #endregion

        #region UI handlers
        private void inputNumber_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (Error)
            {
                Error = false;
                statusMessage.Text = "Ready";
            }
        }

        private void buttonCalculate_Click(object sender, RoutedEventArgs e)
        {
            if (inputNumber.Text == "") return;

            decimal d;

            if (!decimal.TryParse(inputNumber.Text, out d))
            {
                Error = true;
                statusMessage.Text = "Bad number.";
            }

            else BeginWork(d);
        }

        private void contextCopyRem_Click(object sender, RoutedEventArgs e)
        {
            DecimalPair pair = factorizationDisplay.SelectedItem as DecimalPair;
            if (pair == null) return;

            Clipboard.SetText(pair.First.ToString());
        }

        private void contextCopyDiv_Click(object sender, RoutedEventArgs e)
        {
            DecimalPair pair = factorizationDisplay.SelectedItem as DecimalPair;
            if (pair == null) return;

            Clipboard.SetText(pair.Second.ToString());
        }

        private void contextClear_Click(object sender, RoutedEventArgs e)
        {
            factorizationDisplay.Items.Clear();
        }

        private void statusCancel_Click(object sender, RoutedEventArgs e)
        {
            FactorizatorAlgorithm.Abort = true;
        }

        private void TextBlock_MouseUp(object sender, MouseButtonEventArgs e)
        {
            DynamicLink.Launcher.StartModule("Help", "factorizator");
        }

        #endregion

        #region Worker
        void BeginWork(decimal num)
        {
            num = Math.Truncate(num);

            // Visual stuff
            statusMessage.Text = "Calculating...";
            statusProgress.Visibility = System.Windows.Visibility.Visible;
            statusCancel.Visibility = System.Windows.Visibility.Visible;

            // Start thread
            worker = new Thread(new ParameterizedThreadStart(DoWork));
            worker.Start(num);
        }

        delegate void FinishWorkDelegate(decimal[] resultFact, decimal[] resultNum);
        void DoWork(object param)
        {
            decimal number = (decimal)param;
            decimal[] resultFact, resultNum;

            FactorizatorAlgorithm.Factorize(number, out resultFact, out resultNum);
            Dispatcher.Invoke(new FinishWorkDelegate(FinishWork), resultFact, resultNum);
        }

        void FinishWork(decimal[] resultFact, decimal[] resultNum)
        {
            factorizationDisplay.Items.Clear();

            // Show results
            for (int i = 0; i < resultNum.Length; i++)
            {
                if (i < resultFact.Length)
                    factorizationDisplay.Items.Add(new DecimalPair(resultNum[i], resultFact[i]));
                else factorizationDisplay.Items.Add(new DecimalPair(resultNum[i], 0));
            }

            // Update visual stuff
            statusMessage.Text = "Ready";
            statusProgress.Visibility = System.Windows.Visibility.Hidden;
            statusCancel.Visibility = System.Windows.Visibility.Hidden;
        }

        #endregion


    }
}