using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace RandomNumber
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private string rndNumber = "";
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.button1 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(176, 200);
			this.button1.Name = "button1";
			this.button1.TabIndex = 1;
			this.button1.Text = "button1";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// label1
			// 
			this.label1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
			this.label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.label1.Font = new System.Drawing.Font("Arial", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.label1.Location = new System.Drawing.Point(168, 16);
			this.label1.Name = "label1";
			this.label1.TabIndex = 2;
			this.label1.Text = "label1";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// textBox1
			// 
			this.textBox1.Font = new System.Drawing.Font("Arial", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.textBox1.Location = new System.Drawing.Point(168, 56);
			this.textBox1.Name = "textBox1";
			this.textBox1.TabIndex = 3;
			this.textBox1.Text = "";
			this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(456, 266);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.button1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void GenerateRandomString()
		{
			Random rnd = new Random();
			rnd.Next(9);
			for(int i = 0; i < 4; i++)
			{
				for(int ii = 0; ii >= 0; ii++)
				{
					string num = rnd.Next(9).ToString();
					if(rndNumber.IndexOf(num) == -1)
					{
						rndNumber += num;
						break;
					}
				}
			}
		}

		private void CompareStrings()
		{
			char[] chrArray = this.textBox1.Text.ToCharArray();
			if(chrArray.Length == 4)
			{
				bool bDupe = false;
				bool bChar = false;
				for(int i = 0; i < chrArray.Length; i++)
				{
					for(int ii = 0; ii < chrArray.Length; ii++)
					{
						if(chrArray[i] == chrArray[ii] && i != ii)
						{
							bDupe = true;
						}
					}
					if(!Char.IsNumber(chrArray[i]))
					{
						bChar = true;
					}
				}
				if(!bChar)
				{
					if(!bDupe)
					{
						if(this.textBox1.Text == this.rndNumber)
						{
							MessageBox.Show("you guessed right... you win");
						}
						else
						{
							MessageBox.Show("you guessed wrong... try again");
						}
					}
					else
					{
						MessageBox.Show("no two numbers can be the same");
					}
				}
				else
				{
					MessageBox.Show("only numbers are allowed");
				}
			}
			else
			{
				MessageBox.Show("the input must be 4 numbers");
			}
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			this.rndNumber = "";
			this.label1.Text = "";
			this.GenerateRandomString();
			this.label1.Text = rndNumber;
			this.CompareStrings();
		}

	}
}