//  Prime Numbers. © 2006

using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Threading;
using System.Windows.Forms;

namespace isPrime
{
    /// <summary>
    /// isPrimeForm : Main and the only Form.
    /// </summary>
    public class isPrimeForm : System.Windows.Forms.Form
    {
        #region Declarations, Ctor & Dispose()

        private System.Threading.Thread PrimeTesterThread;
        private delegate void testCompleteHandler(bool isPrime,ulong catched);
        private event testCompleteHandler testComplete;

        private System.Threading.Thread RangeTesterThread;
        private delegate void rangeTestCompleteHandler();
        private event rangeTestCompleteHandler rangeTestComplete;

        private decimal number = 0m , rangeStart = 0m , rangeEnd = 0m , ct = 0m;
        private string firstLine = "";

        private System.Windows.Forms.GroupBox groupBoxInput;
        private System.Windows.Forms.ProgressBar progressBar;
        private System.Windows.Forms.TextBox textBoxInput;
        private System.Windows.Forms.Button buttonClear;
        private System.Windows.Forms.TabControl tabControl;
        private System.Windows.Forms.TabPage tabPageSingle;
        private System.Windows.Forms.TabPage tabPageRange;
        private System.Windows.Forms.TextBox textBoxRangeStart;
        private System.Windows.Forms.TextBox textBoxRangeEnd;
        private System.Windows.Forms.Label labelRangeTo;
        private System.Windows.Forms.Label labelRangeFrom;
        private System.Windows.Forms.LinkLabel linkLabel;
        private System.Windows.Forms.Label labelInfoSingle;
        private System.Windows.Forms.Button buttonTest;
        private System.Windows.Forms.Button buttonStart;
        private System.Windows.Forms.TextBox textBoxRangeResults;
        private System.Windows.Forms.TextBox textBoxStatusSingle;
        private System.Windows.Forms.Button buttonCancelRange;
        private System.Windows.Forms.ProgressBar progressBarRange;
        private System.Windows.Forms.Button buttonSave;
        private System.Windows.Forms.SaveFileDialog saveFileDialog;
        private System.Windows.Forms.Label labelNumberCount;
        private System.Windows.Forms.CheckBox checkBoxNC;
        private System.Windows.Forms.Button buttonCancel;

        public isPrimeForm()
        {
            InitializeComponent();
            this.testComplete += new testCompleteHandler(this.testHandler);
            this.rangeTestComplete += new rangeTestCompleteHandler(this.rangeTestHandler);
        }

        protected override void Dispose( bool disposing )
        {
            if ( this.PrimeTesterThread != null )
                this.PrimeTesterThread.Abort();
            if ( this.RangeTesterThread != null )
                 this.RangeTesterThread.Abort();
            base.Dispose( disposing );
        }
        #endregion
        #region Windows Form Designer generated code
        private void InitializeComponent()
        {
            // ...
            // InitializeComponent() kısmı.
            // ...
        }
        [STAThread]
        static void Main() 
        {
            Application.Run(new isPrimeForm());
        }
        #endregion

        private void isPrimeForm_Load(object sender, System.EventArgs e)
        {
            this.Size = new Size( 327 , 295 );
        }

        private void buttonTest_Click(object sender, System.EventArgs e)
        {
            string msg;
            if ( validateInput( this.textBoxInput.Text , out this.number , out msg ) ) 
            {
                this.buttonClear.Enabled = this.buttonTest.Enabled = this.textBoxInput.Enabled = false;
                this.buttonCancel.Enabled = true;
                this.CancelButton = this.buttonCancel;
                this.labelInfoSingle.Text = "[ ESC = cancel ]";
                this.tabPageSingle.Cursor = Cursors.WaitCursor;
                this.firstLine = this.number.ToString( "N0" ) + "\r\n\r\n";
                this.textBoxStatusSingle.Text = firstLine + "Testing...";
                this.progressBar.Value = 0;
                this.progressBar.Show();
                this.progressBar.Select();
                this.PrimeTesterThread = new Thread(new ThreadStart(this.primeTestThreadStart));
                this.PrimeTesterThread.Start();
            }
            else
            {
                this.textBoxStatusSingle.Text = msg;
                this.textBoxInput.Focus();
            }
        }

        private void buttonStart_Click(object sender, System.EventArgs e)
        {
            string msg;
            if ( this.validateInput( this.textBoxRangeStart.Text , out this.rangeStart , out msg )
                && this.validateInput( this.textBoxRangeEnd.Text , out this.rangeEnd , out msg ) )
            {
                this.textBoxRangeStart.Enabled = this.textBoxRangeEnd.Enabled = this.buttonSave.Enabled
                    = this.buttonStart.Enabled = this.textBoxRangeResults.Enabled = false;
                this.buttonCancelRange.Enabled = true;
                this.tabPageRange.Cursor = Cursors.WaitCursor;
                this.textBoxRangeResults.Clear();
                this.labelNumberCount.Show();
                this.progressBarRange.Value = 0;
                this.progressBarRange.Show();
                this.progressBarRange.Select();
                this.RangeTesterThread = new Thread(new ThreadStart(this.rangeTestThreadStart));
                this.RangeTesterThread.Start();
            }
            else
                this.textBoxRangeResults.Text = msg;
        }

        private void buttonCancel_Click(object sender, System.EventArgs e)
        {
            this.PrimeTesterThread.Abort();
            this.textBoxStatusSingle.Text = this.firstLine + "Canceled.";
            this.testEnd();
        }
        
        private void buttonCancelRange_Click(object sender, System.EventArgs e)
        {
            this.RangeTesterThread.Abort();
            this.textBoxRangeResults.AppendText( "Canceled.\r\n" );
            this.rangeTestEnd();
        }

        private void buttonClear_Click(object sender, System.EventArgs e)
        {
            this.textBoxInput.Text = "";
            this.textBoxInput.Focus();
        }

        private void testHandler(bool isPrime,ulong catched)
        {
            this.BeginInvoke(new testCompleteHandler(this.test_Complete) ,
                new Object[] { isPrime , catched } );
        }

        private void rangeTestHandler()
        {
            this.BeginInvoke(new rangeTestCompleteHandler(this.rangeTest_Complete));
        }

        private void test_Complete(bool isPrime,ulong catched)
        {
            this.PrimeTesterThread.Abort();
            if ( isPrime )
                this.textBoxStatusSingle.Text = firstLine + "PRIME.";
            else if ( catched > 0 )
                this.textBoxStatusSingle.Text = firstLine + "NOT Prime, divisible to " + catched.ToString("N0");
            else
                this.textBoxStatusSingle.Text = firstLine + "NOT Prime.";
            this.testEnd();
        }

        private void rangeTest_Complete()
        {
            this.RangeTesterThread.Abort();
            this.rangeTestEnd();
        }

        private void testEnd()
        {
            this.PrimeTesterThread = null;
            GC.Collect();
            this.buttonClear.Enabled = this.buttonTest.Enabled = this.textBoxInput.Enabled = true;
            this.buttonCancel.Enabled = false;
            this.CancelButton = this.buttonClear;
            this.tabPageSingle.Cursor = Cursors.Default;
            this.labelInfoSingle.Text = "[ ENTER = test , ESC = clear ]";
            this.progressBar.Hide();
            this.textBoxInput.Focus();
        }

        private void rangeTestEnd()
        {
            this.textBoxRangeResults.AppendText( "Number Count : " + this.ct.ToString( "N0" ) + "\r\n" );
            this.RangeTesterThread = null;
            GC.Collect();
            this.buttonStart.Enabled = this.textBoxRangeStart.Enabled = this.buttonSave.Enabled
                = this.textBoxRangeEnd.Enabled = this.textBoxRangeResults.Enabled = true;
            this.buttonCancelRange.Enabled = false;
            this.labelNumberCount.Hide();
            this.tabPageRange.Cursor = Cursors.Default;
            this.progressBarRange.Hide();
            this.textBoxRangeStart.Focus();
        }

        private void primeTestThreadStart()
        {
            ulong result = this.primeTest( this.number );
            switch ( result ) 
            {
                case 1:
                    this.testComplete( true , 1 );
                    break;
                default:
                    this.testComplete( false , result );
                    break;
            }
        }

        private void rangeTestThreadStart()
        {
            ulong result;
            decimal start = 0m , end = this.ct = 0m;

            if ( this.rangeStart < 2 )
                start = 1;
            else
                start = this.rangeStart;

            if ( this.rangeEnd < 2 )
                end = 1;
            else
                end = this.rangeEnd;

            if ( start > end )
            {
                decimal temp = start;
                start = end;
                end = temp;
            }

            this.textBoxRangeResults.AppendText( "Prime numbers between " + this.rangeStart.ToString("N0") + " and " + this.rangeEnd.ToString("N0") + " :\r\n" );
            decimal numbers = (decimal)Math.Ceiling( ((double)((this.rangeEnd - this.rangeStart)/50)) );
            decimal step_r = ( (numbers)%2 == 0 ? numbers + 1 : numbers );
            start--;
            while ( end > start++ )
            {
                result = this.primeTest(start);
                if ( result == 1 )
                {
                    this.textBoxRangeResults.AppendText( start.ToString( "N0" ) + "\r\n" );
                    this.ct++;
                    if ( this.checkBoxNC.Checked )
                        this.labelNumberCount.Text = "Number Count :\r\n" + ct.ToString("N0");
                }
                if ( start % step_r == 0 )
                    this.progressBarRange.PerformStep();
            }            
            this.rangeTestComplete();
        }

        private ulong primeTest( decimal n )
        {
            if ( n < 2 )
                return 0;
            if  ( n == 2 || n == 3 )
                return 1;
            if ( n % 2 == 0 )
                return 2;
            else
            {
                ulong end = (ulong)Math.Ceiling( Math.Sqrt( (double)n ) ) + 1;
                ulong step = ( (end/60) % 2 == 0 ? end/60 + 1 : end/60 );
                for ( ulong i = 3 ; i <= end ; i += 2 ) 
                {
                    if  ( n % i == 0 )
                        return i;
                    if ( i % step == 0 )
                        this.progressBar.PerformStep();
                }
                return 1;
            }
        }

        private bool validateInput( string s , out decimal n , out string errMsg )
        {
            n = 0m;
            errMsg = null;
            if ( s.Length == 0 )
            {
                errMsg = "\r\nENTER A NUMBER TO TEST";
                return false;
            }
            try
            {
                n = Convert.ToDecimal(s);
            }
            catch ( System.FormatException )
            {
                errMsg  = "ENTER A POSITIVE INTEGER,\r\nNOT A STRING ;)";
                return false;
            }
            catch ( System.OverflowException )
            {
                errMsg = "ENTER AN INTEGER\r\nBETWEEN 2^96 and - (2^96)";
                return false;
            }
            return true;
        }

        private void linkLabel_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("mailto:[email protected]?subject=about isPrime");
        }

        private void tabControl_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            if ( this.tabControl.SelectedIndex == 0 )
            {
                this.Size = new Size( 327 , 295 );
                this.textBoxInput.Focus();
            }
            else
            {
                this.Size = new Size( 336 , 368 );
                this.textBoxRangeStart.Focus();
            }
        }

        private void buttonSave_Click(object sender, System.EventArgs e)
        {
            this.saveFileDialog.ShowDialog();
        }

        private void saveFileDialog_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            StreamWriter sw = new StreamWriter( this.saveFileDialog.FileName );
            sw.Write( this.textBoxRangeResults.Text );
            sw.Close();
        }

        private void textBoxes_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.Text)) 
                e.Effect = DragDropEffects.Copy;
            else
                e.Effect = DragDropEffects.None;
        }

        private void textBoxes_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
        {
            ((TextBox)sender).Text = e.Data.GetData(DataFormats.Text).ToString();
        }

    }
 }