// Chapter 11, exercise 06: read text file, replace punctuation with
// whitespace, replace "don't" with "do not", "can't" with "cannot" etc.
// Leave hyphens within words intact
// Convert all characters to lower case

#include "pch.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <exception>
#include <algorithm>

std::vector<std::string> read_text_from_file(std::string& fn)
{
    std::string line;
    std::vector<std::string> text;
    std::ifstream ifs(fn.c_str());
    if (!ifs) std::cerr<<"Cannot open the file: "<<fn;
    //for (size_t i = 0; i < text.size(); i++)
    while(std::getline(ifs,line))
        text.push_back(line);
    return text;
}

void to_lower(std::string& s)
{
    //if (s.size() == 0) return;    // skipt empty line
    for (size_t i = 0; i < s.size(); ++i)
        s[i] = tolower(s[i]);
}

// change string to lower case
void to_lowercase(std::vector<std::string>& v)
{
    std::string s;
    for (size_t i = 0; i < v.size(); i++)
    {
        std::istringstream is(v[i]);
        if (is >> s)
            to_lower(v[i]);
    }
}

// change string to lower case
void to_lowercase(std::vector<std::string>& v)
{
    std::string s;
    for (size_t i = 0; i < v.size(); i++)
    {
        std::istringstream is(v[i]);
        if (is >> s)
            to_lower(v[i]);
    }
}


// remove punctuation except ' and -
void remove_punct()
{
    ;
}

// replace "don't" with "do not", "can't" with "cannot" etc.
// removes extra spaces between words
void expand_aux(std::string& s)
{
    ;
}

int main()
{
    std::cout << "Enter the file name\n";
    std::string file_name;
    std::cin >> file_name;
    std::vector<std::string> changed_text;
    changed_text = read_text_from_file(file_name);
    to_lowercase(changed_text);
    for (size_t i = 0; i < changed_text.size(); i++)
    {
        std::cout << changed_text[i];
    }
}