using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace LabX
{
    class FileSentenseReader
    {
        static FileInfo defaultFile = new FileInfo(@"..\..\..\files\text.txt");
        static StreamReader reader;
        static String word;

        public static void Start()
        {
            Console.Clear();
            Console.WriteLine("Enter the custom file name, or nothing to use default file");

            FileInfo file;

            String userFile = Program.GetCorrectString(0).Replace("\"", String.Empty);
            if (!File.Exists("userFile") || String.IsNullOrEmpty(userFile))
                file = defaultFile;
            else
                file = new FileInfo(userFile);

            reader = new StreamReader(file.FullName, System.Text.Encoding.UTF8);
            Console.WriteLine("Is used " + file.Name + " file");
            Console.WriteLine("\nEnter the word to be count it the file");
            word = Program.GetCorrectString();
            Console.WriteLine();

            char r;
            int checkIndex = 0;
            bool endOfSentense = false;
            int frequency = 0;
            while(reader.Peek() != -1)
            {
                r = (char) reader.Read();
                if(r != '\n' && r != '\r')
                    Console.Write(r);
                if (word[checkIndex] == r){
                    checkIndex++;
                    if (checkIndex == word.Length)
                    {
                        frequency++;
                        checkIndex = 0;
                    }
                }else{
                    checkIndex = 0;
                }
                if (r == '.')
                {
                    endOfSentense = true;
                    continue;
                }
                if (endOfSentense)
                {
                    endOfSentense = false;
                    if (r == ' ' || r == '\n' || r == '\r')
                    {
                        Console.WriteLine("\nFrequency: " + frequency + "\n");
                        frequency = 0;
                    }
                }



            }
            //Console.Write(reader.ReadToEnd());


        }
    }
}