/*
Program Name: HTML Converter
Process: ???
Function Input/Parameters: ???
Function Output/Parameters: ???
Function Output/Returned: ???
Device Input/Device: ???
Device Output/Monitor: ???
Dependencies: ???
*/

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <filesystem>
#include <cstring>
#include <vector>
#include <random>
#include <algorithm>
#include <time.h>

using namespace std;

// class definitions

// function prototypes

// main program
int main(int argc, char **argv)
{
    string fileName;
    filesystem::path filePath;
    ifstream inputFile;
    ofstream outputFile;
    char currentChar;
    // menu for user
    cout << "CPP to HTML Converter" << endl;
    
    // ask the user for a cpp file. (check to see if valid?)
    cout << "Please enter a CPP source file: ";
    cin >> fileName;

    // check if the file has the .cpp extension
    filePath = fileName;
    if(filePath.extension() != ".cpp" && filePath.extension() != ".cp" && 
       filePath.extension() != ".C" && filePath.extension() != ".cc")
    {
        cout << "Invalid File, please enter something else and try again." << endl;
        return -1;
    }

    // check if the file exists
    if(!filesystem::exists(fileName))
    {
        cout << "File is valid, but does not exist." << endl;
        return -1;
    }

    // the file exists, start the parsing according to the comment below.
    inputFile.open(fileName);
    outputFile.open(filePath.replace_extension(".html"));
    
    // add the <pre> tag, read each character, check to see if the character is one that needs to be
    // modified, like '<' and '>' and turned into '&lt;' and '&gt;' once at the end of input file,
    // add the </pre> tag, and output to a new html file that uses the file name 
    // and rids itself of everything after the dot and replaces it with '.html' and writes it out.

    // add the '<pre>' tag to the output file
    outputFile << "<pre>" << endl;
    // read in the characters one at a time, check if the character is a '<' or a '>' and replace.
    currentChar = inputFile.get();
    // outputFile << (char)inputFile.get();
    while(!inputFile.eof())
    {
        if(currentChar == '<' || currentChar == '>')
        {
            //
            if(currentChar == '<')
            {
                outputFile << "&lt;";
            }
            else
            {
                outputFile << "&gt;";
            }
        }
        else
        {
            outputFile << currentChar;
        }
        currentChar = inputFile.get();
        // outputFile << (char)inputFile.get();
    }
    // add the '</pre> tag to the output file
    outputFile << "</pre>";

    // close the input and output files
    inputFile.close();
    outputFile.close();
    
    // return 0
    return 0;
}