#include <iostream>
#include "help.h"
#include <fstream>

// terminal text colors
#define RST  "\x1B[0m"
#define KRED  "\x1B[31m"
#define KGRN  "\x1B[32m"
#define KYEL  "\x1B[33m"
#define KBLU  "\x1B[34m"
#define KMAG  "\x1B[35m"
#define KCYN  "\x1B[36m"
#define KWHT  "\x1B[37m"

#define FRED(x) KRED x RST
#define FGRN(x) KGRN x RST
#define FYEL(x) KYEL x RST
#define FBLU(x) KBLU x RST
#define FMAG(x) KMAG x RST
#define FCYN(x) KCYN x RST
#define FWHT(x) KWHT x RST

#define BOLD(x) "\x1B[1m" x RST
#define UNDL(x) "\x1B[4m" x RST

int global_remember = 0;

using namespace std;

int file_lenght(ifstream& is){
    is.seekg (0, is.end);
    int length = is.tellg();
    return length;

}


void print_line(int* diff_chars, string& line1, string& line2, int length1, int length2){
    for(int i = 0; i < length2 && i < length1; i++){
        if(i == *diff_chars++){
            cout << line1[i] << "\033[1;31m" << line2[i] << "\033[0m;";
        } else {
            cout << line1[i] << line2[i] << '\n';
        }
    }
}

void difffiles(ifstream& fs1, ifstream& fs2){
    string line1;
    string line2;
    int len = file_lenght(fs1);

    int* diff_chars = new int[len];
    while(getline(fs1, line1)){
        if(getline(fs2, line2)){        // stopped here because getline won't work
            cout << "executed 0;";
            global_remember = 0;
            size_t length1 = line1.length();
            size_t length2 = line2.length();
            for(int i = 0; i < length1 && i < length2; i++){
                if(line1[i] != line2[i]){
                    diff_chars[global_remember++] = i;
                    continue;
                }

            }
            print_line(diff_chars, line1, line2, length1, length2);
        }
    }
    delete[] diff_chars;
}

void openfiles(char* file1, char* file2){
    ifstream fs1(file1);
    ifstream fs2(file2);
    if(fs1.is_open() && fs2.is_open()){
       difffiles(fs1, fs2);
    } else{
        cout << "File doesn't exist" << '\n';
        exit(1);
    }
}

int main(int argc, char* argv[]){
    if(argc <= 1){
        help(*argv);
        exit(1);
    } else if(argc == 4 || argc == 2){
        while(*argv++ != NULL && **argv == '-'){
            switch(*++*argv){
                case 'h':
                    help(*--argv);
                    return 0;
                    break;
                case 'f':
                    openfiles(*argv, *++argv);
                    break;

            }
        }
    }
    exit(0);

}