// Chapter 12, Program Challenge 6 - string search
// This program will search for a specific string (based on user input)
// in a file and then return all lines that include that string.  
#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

int main()
{
    const int SIZE = 31;                 // constant for size of character string
    char stringSearch[SIZE];             // used to search for the string in the file
    char fileName[SIZE];                 // to hold the file name
    ifstream inputFile;                  // input file
    int counter = 0;                     // counter for counting number of string occurences
    char *stringPtr;                     // points to the string
    
    // Prompt user to select a string to search from the file
    cout << "Enter a word or string of words to search for: ";
    cin.getline(stringSearch, SIZE);
    // Get the input file name
    cout << "Enter the name of a file that you would\n";
    cout << "like to search for a string within: ";
    cin >> fileName;
    
    
    // Open the file for input.
    inputFile.open(fileName);
    if(!inputFile)
    {
         cout << "Cannot open " << fileName << endl;
         system("pause");
         return 0;
    }
    
    // Search file for user-input string
    while(!inputFile.eof())
    {
         inputFile.getline(stringSearch, SIZE);
         cout << stringSearch;
         cout << endl;
    }                  
    
    cout << endl;
    
    // Close the files.
    inputFile.close();
    
    system("pause");
    return 0;
}

//************************************
// NOTE:  ASCII Table, '0' to '9' are represented as 48 to 57
//************************************
// This program will search for a specific string (based on user input)
// in a file and then return all lines that include that string.  
//************************************
#include <cstring>
#include <ctime>
#include <ctype.h>
#include <fstream>                            // file I/O
#include <iomanip>                            // format manipulation
#include <iostream>
#include <limits>
#include <map>
#include <math.h>
#include <sstream>
#include <stddef.h>
#include <stdexcept>
#include <stdio.h>
#include <stdlib.h>                            // converter functions
#include <string>
using std::istringstream;
using std::ifstream;
using std::string;
using std::cout;
using std::cin;
using std::cerr;
using std::map;
using std::multimap;

using namespace std;
//************************************
//In general, C++ strings are preferred over C strings.
//************************************
void CreateExampleTxtFile();
void PrintExampleTxtFile();
void SizeExampleTxtFile();
int SearchExampleTxtFile();
//************************************
int main(int argc, char* argv[])
{
    int choice = 0;
    bool exitt = false;

    do
    {
        system("CLS");

        cout << endl << endl << endl;
        cout << "           MENU" << endl;
        cout << "  ************************" << endl << endl;
        cout << "  1  Create new file." << endl;
        cout << "  2  Print new file" << endl;
        cout << "  3  Size new file" << endl;
        cout << "  4  Search new file." << endl << endl;
        cout << "     Enter 0 to exit" << endl << endl;

        //test validity of user input data


        //Get customer input

        cout << "  Please type a number from 0 to 4 and then press enter ==> ";

        cin >> choice;


        switch(choice)
        {
            //Call class member functions

        case 0:

            break;

        case 1:
            CreateExampleTxtFile();
            break;

        case 2:
            PrintExampleTxtFile();
            break;

        case 3:
            SizeExampleTxtFile();
            break;

        case 4:
            SearchExampleTxtFile();
            break;

        default:
            cout << endl << endl << endl;
            cout << "  Please select again." << endl << endl;
            break;
        }

        cout << endl << endl << endl;
        cout << "  Type the number 1 and press return to run this program again." << endl << endl << endl;
        cout << "  Type any key and press return to exit ==> ";

        cin >> choice;

        if (choice == 1)
            exitt = false;
        else
            exitt = true;
    }while(exitt == false);

    cout << endl << endl << endl;
    cout << "  ";
    system("PAUSE");

    return 0;
}
//************************************
//This function creates a file named example.txt
//and inserts six sentences into example.txt.
void CreateExampleTxtFile()
{
    ofstream myfile;
    myfile.open ("example.txt");
    if (myfile.is_open())
    {
        myfile << "one two three four five\n";
        myfile << "two three four five six\n";
        myfile << "three four five six seven\n";
        myfile << "four five six seven eight\n";
        myfile << "five six seven eight nine\n";
        myfile << "six seven eight nine ten\n";
        myfile.close();
    }
    else cout << "  Unable to open file";
}

//************************************
//This function reads a file named example.txt
//and prints contents to console.
void PrintExampleTxtFile()
{
    string line;

    ifstream myfile ("example.txt");
    system("CLS");
    if (myfile.is_open())
    {
        while (! myfile.eof() )
        {
            getline (myfile, line);
            cout << "  " << line << endl;
        }
        myfile.close();
    }

    else cout << "  Unable to open file";
}

//************************************
//This function prints the size of the example.txt file,
//on the console.
void SizeExampleTxtFile()
{
    long begin;
    long end;
    ifstream myfile ("example.txt");
    begin = myfile.tellg();
    myfile.seekg (0, ios::end);
    end = myfile.tellg();
    myfile.close();
    system("CLS");
    cout << endl << endl << endl;
    cout << "  File size is: " << (end - begin) << " bytes.\n";
}

//************************************
int SearchExampleTxtFile()
{
    const int SIZE = 200;                // constant for size of character string
    char fileName[SIZE];                 // to hold the file name
    ifstream inputFile;                  // input file
    int counter = 0;                     // counter for counting number of string occurences

    system("CLS");

    //************************************
    // Get user's file name
    cout << endl << endl << endl;
    cout << "  Enter the name of the file you want\n";
    cout << "  to search and press return ==> ";
    cin >> fileName;        //fileName is example.txt

    // Open user's file.
    inputFile.open(fileName);
    if(!fileName)
    {
        cout << endl << endl << endl;
        cout << "  Cannot open " << fileName << endl;
        cout << endl << endl << endl;
        cout << "  ";
        system("pause");
    }

    //************************************
    //reads a file named example.txt searches for user defined string
    //and prints results to console.
    multimap<string, int> words;
    map<int, string> lines;
    string str;
    ifstream input("example.txt");
    if(input.fail())
    {
        cerr<<"\n  The file could not be opened.";
        return -1;
    }
    int i=1;
    while(getline(input,str))
    {
        istringstream in(str);
        string s;
        while(in>>s)
        {
            words.insert(make_pair(s,i));
        }
        lines.insert(make_pair(i,str));
        i++;
    }
    string search;
    cout << "\n  Enter a word to search: ";
    cin >> search;

    cout << "\n  The number of matches = " << words.count(search) << '\n';
    multimap < string,int>::iterator it1=words.lower_bound(search);
    multimap < string,int>::iterator it2=words.upper_bound(search);
    while(it1 != it2)
    {
        int x=it1->second;
        map<int,string>::iterator iter = lines.find(x);
        cout << '\n' << x << " ) " << iter->second << '\n';
        it1++;
        while(true)
        {
            if(it1 != it2 && it1->second == x)
            {
                it1++;

            }
            else
            {
                break;
            }
        }
    }
    return 0;
}