/**
 * Варіант 8
 * Написати програму, яка:
 * • Виводить текст на екран дисплея;
 * • Визначає кількість символів в найкоротшому слові;
 * • По натисненню довільної клавіші по черзі виділяє кожне слово тексту, що містить мінімальну кількість символів.
*/

#include <iostream>
// to read from file
#include <fstream>
#include <string>
#include <vector>
// to use istringstream which facilitates spliting string on words
#include <sstream>
// used in clearScreen
#include <stdio.h>
#include <algorithm>

using namespace std;

// read string from file
string getContent();
// split string on words
vector<string> stringToWords(string content);
// print vector and CAPITALIZE highlight word
void printVector(vector<string> vec, string highlight);
// convert string to lower case
string toLowerCase(string s);
// convert string to UPPER case
string toUpperCase(string s);
// convert vector to vector with unique values
vector<string> uniqueVectorKeys(vector<string>);

// sort vector by string length
// result vector will have smaller strings at the beginning
vector<string> sortVectorByWordLength(vector<string> vec);
// function used in sortVectorByWordLength
// to compare 2 strings
// returns true if a is shorter then b
bool sortWordByLength(string a, string b);

// removes content from screen
// will be used to rewrite console screen
void clearScreen();

int main() {
    // read and convert to lower case
    // we convert to lower case because we highlight words
    // by making them uppercase
    // It will be more visual if else in lower case
    string content = toLowerCase(getContent());
    vector<string> vec = stringToWords(content);
    // unique words from file ordered in ascending way: a, aa, aaa, aaaa
    vector<string> words = sortVectorByWordLength(uniqueVectorKeys(vec));
    // word which we will be highlighting
    string highlight = "";
    // iterator to run over words
    vector<string>::iterator it = words.begin();

    do {
        // clean screen before use
        // it will allow to rewrite output when user clicks ENTER
        clearScreen();
        // reach current word
        highlight = *it;
        cout << "Current smallest word: \"" << highlight << "\", length: " << highlight.length() << endl << endl;
        // print input vector and UPPERCASE current word
        printVector(vec, highlight);
        cout << endl << endl;
        // So, just press enter on your keyboard
        cout << "Press ENTER key to highligh next min word";
        // To wait for enter
        cin.get();
        // To read next word
        it++;
    } while(it != words.end());

    return 0;
}

vector<string> uniqueVectorKeys(vector<string> vec) {
    sort(vec.begin(), vec.end());
    vec.erase(unique( vec.begin(), vec.end() ), vec.end());
    return vec;
}

bool sortWordByLength(string a, string b) {
    return a.length() < b.length();
}

vector<string> sortVectorByWordLength(vector<string> vec) {
    sort(vec.begin(), vec.end(), sortWordByLength);
    return vec;
}

void printVector(vector<string> vec, string highlight) {
    string word;

    for(vector<string>::iterator it = vec.begin(); it != vec.end(); ++it) {
        word = *it;

        if(word == highlight) {
            word = toUpperCase(word);
        }

        cout << word << " ";
    }
}

vector<string> stringToWords(string content) {
    vector<string> vec;

    istringstream iss(content);
    copy(istream_iterator<string>(iss),
         istream_iterator<string>(),
         back_inserter(vec));

    return vec;
}

string getContent() {
    // make this path your own!
    // I cound not place file inside project's dir
    // because I have different development environment
    ifstream in("/Users/oknyga/data.dat");
    string contents((istreambuf_iterator<char>(in)), istreambuf_iterator<char>());

    return contents;
}

string toLowerCase(string s) {
    transform(s.begin(), s.end(), s.begin(), ::tolower);
    return s;
}

string toUpperCase(string s) {
    transform(s.begin(), s.end(), s.begin(), ::toupper);
    return s;
}

// OS dependent code
// Because I was developing on OSX
// and code will be run on Windows
// I created function which can clean
// on both Windows and Unix (in teory)
#ifdef __cplusplus__
void clearScreen() {
    cout << string( 100, '\n' );
}
#else
void clearScreen() {
    int n;
    for (n = 0; n < 10; n++)
        printf( "\n\n\n\n\n\n\n\n\n\n" );
}
#endif