using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Xml;

namespace Task_3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// Opens File and executes code to show how many duplicates there are
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void openFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //Set up streamreader
            StreamReader reader;
            //Create filter for txt files
            openFileDialog1.Filter = "Text Document|*.txt|All Files|*.*";
            //List to store all names 
            List<string> namesList = new List <string> ();
            //List to store duplicate names
            List<string> duplicateCheckList = new List<string>();
            //Try catch for input
            try
            {
                //If ok is pressed
                if(openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    //Reads file
                    reader = File.OpenText(openFileDialog1.FileName);
                    //Try catch for input
                    try
                    {
                        //Execute until the end of stream
                        while (!reader.EndOfStream)
                        {
                            //Reads each line and stores into 2 lists and displays the name
                            string line = reader.ReadLine();
                            namesList.Add(line);
                            duplicateCheckList.Add(line);
                            listBoxAllNames.Items.Add(line);
                        }
                        //Set a counter for number of duplicates
                        int counter = 0;
                        //Goes through each name is original list
                        foreach (string iNameList in namesList)
                        {
                            //Goes through each name in duplicate list
                            foreach (string iDuplicateCheck in duplicateCheckList)
                            {
                                //Checks if the original name list matches the duplicate list
                                if (iNameList == iDuplicateCheck)
                                {
                                    //Counts the duplicate
                                    counter++;
                                }
                            }
                            //Checks if a duplication has occured
                            if (counter != 0)
                            {
                                //Displays the dupliacte items with the number of duplicates
                                listBoxDuplicates.Items.Add(iNameList + ": " + counter);
                            }
                            //Removes all the duplicates from the duplicated list so it doesn't get show again
                            duplicateCheckList.RemoveAll(x => x == iNameList);
                            //Set counter to 0 for next
                            counter = 0;
                        }
                    }
                    catch (Exception ex)
                    {
                        //Displays error message
                        MessageBox.Show(ex.Message);
                        //Clears listboxes
                        listBoxAllNames.Items.Clear();
                        listBoxDuplicates.Items.Clear();
                    }
                }
            }
            catch (Exception ex)
            {
                //Displays error message
                MessageBox.Show(ex.Message
                    );
                //Clears listboxes
                listBoxAllNames.Items.Clear ();
                listBoxDuplicates.Items.Clear();
            }

        }
    }
}