//This .cs file creates the Form which displays the list of addresses.
//Provides options to add, edit and delete addresses.
//Loads the saved addresses into the listview.
//Saves the addresses into a flat file while exiting.
namespace AddressBook
{
	using System;
	using System.Drawing;	
	using System.ComponentModel;
	using System.Windows.Forms;	
	using System.IO;
	
	//AddressHeader is being derived from the ColumnHeader class
	class AddressHeader : ColumnHeader
	{
		public AddressHeader(String myText , int myWidth , HorizontalAlignment myAlign)
		{
			this.Text = myText;
			this.Width = myWidth;
			this.TextAlign = myAlign;
		}
	}
	
	//AddressButton is erived from the Button class.
	class AddressButton : Button
	{
		public AddressButton(String myText)
		{
			this.Text = myText;			
		}
		
		public void SetParams(Size mySize , Point myPoint , int myTabIndex)
		{
			this.Size = mySize;
			this.Location = myPoint;
			this.TabIndex = myTabIndex;
		}
	}
	
	public class AddressList : Form
	{
		private AddressButton btnAddButton;
		private AddressButton btnEditButton;
		private AddressButton btnRemoveButton;
		private AddressButton btnExitButton;

		private ListView lvwAddressList;
		private AddressHeader FirstName;
		private AddressHeader LastName;
		private AddressHeader EMailAddress;
		private AddressHeader PhoneNumber;

		public AddressList()
		{
			this.Text = "Address Book Version 1.0";
			this.ClientSize = new Size(424 , 257);
			this.StartPosition = FormStartPosition.CenterScreen;
			this.FormBorderStyle = FormBorderStyle.FixedDialog;
			this.MaximizeBox = false;			

			FirstName = new AddressHeader("First Name" , 75 , HorizontalAlignment.Left);	
			LastName = new AddressHeader("Last Name" , 75 , HorizontalAlignment.Left);
			EMailAddress = new AddressHeader("E - Mail" , 75 , HorizontalAlignment.Left);
			PhoneNumber = new AddressHeader("Phone Number" , 75 , HorizontalAlignment.Left);			

			lvwAddressList = new ListView();
			lvwAddressList.Location = new Point(16,16);
			lvwAddressList.Size = new Size(296 , 208);
			lvwAddressList.FullRowSelect = true;
			lvwAddressList.GridLines = true;
			lvwAddressList.HideSelection = false;
			lvwAddressList.Sorting = SortOrder.Ascending;
			lvwAddressList.View = View.Details;
			//Adding the 4 ColumnHeaders using the AddRange method
			//Alternatively you can also use Add method
			lvwAddressList.Columns.AddRange(new ColumnHeader[]{FirstName , LastName , EMailAddress , PhoneNumber});
			lvwAddressList.DoubleClick += new EventHandler(onDoubleClick);
			this.Controls.Add(lvwAddressList);

			btnAddButton = new AddressButton("Add");
			btnAddButton.SetParams(new Size(88,32) , new Point(320,16) , 1);			
			btnAddButton.Click += new EventHandler(onAdd);
			this.Controls.Add(btnAddButton);

			btnEditButton = new AddressButton("Edit");
			btnEditButton.SetParams(new Size(88,32) , new Point(320,64) , 2);			
			btnEditButton.Click += new EventHandler(onEdit);
			this.Controls.Add(btnEditButton);

			btnRemoveButton = new AddressButton("Remove");
			btnRemoveButton.SetParams(new Size(88,32) , new Point(320,112) , 3);
			btnRemoveButton.Click += new EventHandler(onRemove);
			this.Controls.Add(btnRemoveButton);

			btnExitButton = new AddressButton("Exit");			
			btnExitButton.SetParams(new Size(88,32) , new Point(320,160) , 3);
			btnExitButton.Click += new EventHandler(onExit);
			this.Controls.Add(btnExitButton);
			
			LoadEntries(); //Opens the data file and loads the addresses into the ListView
		}		

		private void LoadEntries()
		{
			try
			{
				//Using an object of the StreamReader class to open the data file.				
				StreamReader myFileReader = File.OpenText(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\AddressBook.data");
				try
				{
					String myEntry;
					do
					{		
						myEntry = myFileReader.ReadLine();
						if(myEntry != null)
						{									
							ListViewItem myItem = new ListViewItem(myEntry);
							myItem.SubItems.Add(myFileReader.ReadLine());
							myItem.SubItems.Add(myFileReader.ReadLine());
							myItem.SubItems.Add(myFileReader.ReadLine());
							lvwAddressList.Items.Add(myItem);
						}					
					}
					while(myEntry != null);
				}				
				catch(Exception ReadExcept)
				{
					MessageBox.Show(ReadExcept.Message , "Error reading entries" , MessageBoxButtons.OK , MessageBoxIcon.Error);
				}
				finally
				{
					myFileReader.Close();
				}
			}
					
			catch(Exception FileOpenExcept)
			{
				MessageBox.Show("No entries exist in your address book" , "Empty address book" , MessageBoxButtons.OK , MessageBoxIcon.Exclamation);
			}
		}
		
		private void SaveData()
		{
			try
			{
				StreamWriter myFileWriter = File.CreateText(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\AddressBook.data");
				try
				{
					for(int lsCount=0;lsCount<lvwAddressList.Items.Count;lsCount++)
					{						
						myFileWriter.WriteLine(lvwAddressList.Items[lsCount].Text);
						myFileWriter.WriteLine(lvwAddressList.Items[lsCount].SubItems[1].Text);
						myFileWriter.WriteLine(lvwAddressList.Items[lsCount].SubItems[2].Text);
						myFileWriter.WriteLine(lvwAddressList.Items[lsCount].SubItems[3].Text);
					}
				}
				catch(Exception WriteExcept)
				{
					MessageBox.Show(WriteExcept.Message , "Error opening file" , MessageBoxButtons.OK , MessageBoxIcon.Error);
				}			
				finally
				{
					myFileWriter.Close();
				}
			}
					
			catch(Exception FileOpenExcept)
			{
				MessageBox.Show(FileOpenExcept.Message , "Error saving data" , MessageBoxButtons.OK , MessageBoxIcon.Error);
			}
		}
		
		protected void onEdit(Object mySender , EventArgs myArgs)
		{
			if (lvwAddressList.Items.Count != 0)
			{
				ListViewItem editItem = lvwAddressList.FocusedItem;
				if (editItem != null)
				{
					AddressEntry myAddressEntry = new AddressEntry();
					myAddressEntry.FirstName = editItem.Text;
					myAddressEntry.LastName = editItem.SubItems[1].Text;
					myAddressEntry.EMail = editItem.SubItems[2].Text;
					myAddressEntry.PhoneNumber = editItem.SubItems[3].Text;
					myAddressEntry.ShowDialog();
					lvwAddressList.FocusedItem.Text = myAddressEntry.FirstName;
					lvwAddressList.FocusedItem.SubItems.Add(myAddressEntry.LastName);
					lvwAddressList.FocusedItem.SubItems.Add(myAddressEntry.EMail);
					lvwAddressList.FocusedItem.SubItems.Add(myAddressEntry.PhoneNumber);					
				}
			}
		}
		
		protected void onAdd(Object mySender , EventArgs myArgs)
		{
			AddressEntry myAddressEntry = new AddressEntry();					
			myAddressEntry.ShowDialog();
			ListViewItem newItem = new ListViewItem(myAddressEntry.FirstName);						
			newItem.SubItems.Add(myAddressEntry.LastName);
			newItem.SubItems.Add(myAddressEntry.EMail);
			newItem.SubItems.Add(myAddressEntry.PhoneNumber);			
			lvwAddressList.Items.Add(newItem);						
			newItem.Focused = true;					
		}
		
		protected void onDoubleClick(Object mySender , EventArgs myArgs)		
		{
			onEdit(mySender , myArgs);
		}
		protected void onRemove(Object mySender , EventArgs myArgs)
		{
			//multiple selection & deletion
			if (lvwAddressList.Items.Count > 0)
			{
				if (MessageBox.Show("Are you sure to remove the selected item(s) ?","Remove entry/entries ?",MessageBoxButtons.YesNo , MessageBoxIcon.Question) == DialogResult.Yes)
				{
					for (int lvwCount = lvwAddressList.Items.Count;lvwCount > 0; lvwCount--)
					{						
						if (lvwAddressList.Items[lvwCount-1].Selected == true)
						{
							lvwAddressList.Items[lvwCount-1].Remove();
						}						
					}
				}
			}			
			
		}
		
		protected void onExit(Object mySender , EventArgs myArgs)
		{
			DialogResult myResult;
			myResult = MessageBox.Show("Are you sure to quit ?","Address Book 1.0",MessageBoxButtons.YesNo , MessageBoxIcon.Question);
			if (myResult == DialogResult.Yes)
			{
				this.Close();
				Application.Exit(); // all forms are unloaded, resources freed.
			}
		}
		
		//Override the OnClosing event and save the data before closing the form
		protected override void OnClosing (CancelEventArgs e)
		{			
			SaveData();
		}	
	}
}