// ----------------------------------------------------------------------------
// CntChrsDAT.cpp
// Written by:     The Professor
// Last Modified:  Fall 2020
// Description:
// Program to Read a text file
//        and Keep track of the number of occurrences of each character
//        ASCII codes 0 to 127
// ----------------------------------------------------------------------------
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>       // for use of std::stringstream

using namespace std;

int main()
{
    // Could use argv and argc to allow user specified input file
    // But for simplicitly it is hardcoded
    string filename = "ICA320_input.txt";
    ifstream inputFile(filename.c_str());
    
    // The below is probably a bad idea if the file is REALLY big
    // but will work for this exercise
    stringstream buffer;
    buffer << inputFile.rdbuf();
    string contents(buffer.str());
    
    // Now set up to count characters
    // This is effectively a Direct Address Table
    // The key into the table is the Decimal 
    // number associated with the character per ASCII encoding
    int charCount[128];
    
    // Initialize the counts to zero
    for (int i=0; i < 128; i++) 
    { 
      charCount[i] = 0; 
    }
    
    // Loop through the contents and count them
    for (unsigned int i=0; i < contents.size(); i++)
    {
        char ch  = contents[i];
        int  key = ch;           // force typecast to int
        charCount[key]++;
   }

    // Output the counts
    // First 32 characters are not printable
    for (int i=0; i < 32; i += 2) 
    { 
      cout << "character[ " << i << " ] -> " << charCount[i] << "\t";
      cout << "character[ " << i+1 << " ] -> " << charCount[i+1] << endl;
    }
    
    for (int i=32; i < 126; i += 2) 
    { 
        char ch = i;  // force i to be a character
      cout << ch << " -> " << charCount[i] << "\t\t\t\t";
        ch = i+1;  // force i to be a character
      cout << ch << " -> " << charCount[i+1] << endl;
    }

    // character 127 is delete
    char ch = 126;
    cout << ch << " -> " << charCount[126] << "\t\t";
    cout << " character[ 127 ] -> " << charCount[127] << endl;

    inputFile.close();

    return 0;
}