using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security;
using System.Text.RegularExpressions;

namespace _13.ScanFileForListOfWords
{
    class ScanFileForListOfWords
    {
        static void Main()
        {
            try
            {
                StreamReader wordsReader = new StreamReader("words.txt");
                using (wordsReader)
                {
                    string wordsFileContent = wordsReader.ReadToEnd();
                    string[] words = wordsFileContent.Split(new string[] { "\r\n", " " }, StringSplitOptions.RemoveEmptyEntries);
                    int[] numberOfMatches = new int[words.Length];
                    for (int i = 0; i < words.Length; i++)
                    {
                        StreamReader sourceFileReader = new StreamReader("test.txt");
                        using (sourceFileReader)
                        {
                            string newLine = sourceFileReader.ReadLine();
                            while (newLine != null)
                            {
                                string[] wordsInLine = newLine.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                                for (int wordIndex = 0; wordIndex < wordsInLine.Length; wordIndex++)
                                {
                                    if (wordsInLine[wordIndex] == words[i])
                                    {
                                        numberOfMatches[i]++;
                                    }
                                }
                                newLine = sourceFileReader.ReadLine();
                            }
                        }
                    }
                    Array.Sort(numberOfMatches, words);
                    Array.Reverse(numberOfMatches);
                    Array.Reverse(words);
                    StreamWriter writer = new StreamWriter("result.txt");
                    using (writer)
                    {
                        for (int i = 0; i < words.Length; i++)
                        {
                            writer.WriteLine("{0} - {1}", words[i], numberOfMatches[i]);
                        }
                    }
                }
            }
            catch (FileNotFoundException)
            {
                Console.WriteLine("The specified path is invalid! There is no such file in this directory!");
            }
            catch (IOException)
            {
                Console.WriteLine("An I/O error occurred during file read/write opperations!");
            }
            catch (OutOfMemoryException)
            {
                Console.WriteLine("There is insufficient memory to allocate a buffer for the returned string!");
            }
            catch (UnauthorizedAccessException)
            {
                Console.WriteLine("Access is denied and writting in the file is not allowed!");
            }
            catch (PlatformNotSupportedException)
            {
                Console.WriteLine("The operating system is Windows 98 Second Edition or earlier and the files system is not NTFS!");
            }
            catch (SecurityException)
            {
                Console.WriteLine("The caller does not have the required permission to write in the file!");
            }
        }
    }
}