Typing game

#include <ncurses.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{

    // keypad(stdscr, TRUE);
    char buffer[100];
    int i = 0;
    char a[800][20];
    int len = 0;
    char c[1000];
    while (scanf(" %[^\n]%*c", buffer) != EOF)
    {
        strcpy(a[i], buffer);
        i++;
        len++;
    }
    char rep = 'r';
    while (rep == 'r')
    {
        initscr();
        cbreak();
        // noecho();
        refresh();
        freopen("/dev/tty", "r", stdin);

        start_color();
        init_pair(1, COLOR_GREEN, COLOR_BLACK);
        init_pair(2, COLOR_RED, COLOR_BLACK);
        init_pair(3, COLOR_YELLOW, COLOR_BLACK);
        init_pair(4, COLOR_BLUE, COLOR_BLACK);

        attron(COLOR_PAIR(3));
        time_t start_time, end_time;
        int typed = 0, mistakes = 0, correct = 1;

        int x;
        int low = 0, high = 0, word = 0;
        // printw("%d\n", len);
        echo();
        // printw("Enter \n1 for Easy\n2 for Medium\n3 for Hard\n");
        refresh();
        flushinp();
        // noecho();
        // while (1)
        // {
        //     scanw(" %d", &x);
        //     if (x < 1 || x > 3)
        //     {
        //         printw("Invalid input!");
        //         flushinp();
        //     }
        //     else
        //     {
        //         break;
        //     }
        // }

        clear();
        x = atoi(argv[1]);
        if (x == 1)
        {
            low = 1;
            high = 6;
            word = 100;
        }
        else if (x == 2)
        {
            low = 6;
            high = 9;
            word = 75;
        }
        else
        {
            low = 8;
            high = 20;
            word = 50;
        }

        int k = 0, l = 0;
        srand(time(NULL));
        while (l < word)
        {
            i = rand() % len;
            if (strlen(a[i]) - 1 >= low && strlen(a[i]) - 1 <= high)
            {
                for (int j = 0; j < strlen(a[i]) - 1; j++)
                {
                    if (a[i][j] == ' ')
                    {
                        break;
                    }
                    c[k] = a[i][j];
                    k++;
                }
                c[k] = ' ';
                k++;
                l++;
                // k = 0;
            }
            else
            {
                continue;
            }
        }
        c[k] = '\0';
        printw("%s\n\n", c);
        attroff(COLOR_PAIR(3));
        attron(COLOR_PAIR(4));
        if(x == 1) {
            printw("Easy\n");
        } else if(x == 2) {
            printw("Medium\n");
        } else {
            printw("Hard\n");
        }
        attroff(COLOR_PAIR(4));
        i = 0;
        int j = 0;
        char dd[1000];
        memset(dd, 0, sizeof(dd));
        time(&start_time);
        printw("\n");

        while (c[i] != '\0')
        {
            time(&end_time);
            move(10, 0);
            clrtoeol();
            clrtoeol();
            printw("%.2f s remaining\tWPM: %.2f\tTyped: %d\tMistakes: %d\tCPS: %.2f\n", 30.0 - difftime(end_time, start_time), (60.0 * (((float)typed - mistakes) / (4.0 * x))) / (difftime(end_time, start_time)), typed, mistakes, (60.0 * ((((float)typed - mistakes)) / difftime(end_time, start_time))));
            refresh();
            char m[100];
            // int j = 0;
            if (difftime(end_time, start_time) >= 30.0)
            {
                attron(COLOR_PAIR(3));
                printw("\nTime is up!\n");
                break;
                attroff(COLOR_PAIR(3));
            }
            noecho();
            char x = getch();
            refresh();
            if (x == 27)
            {
                break;
            }
            if (x == c[i] && correct == 1)
            {
                dd[i] = x;
                attron(COLOR_PAIR(1));
                clrtoeol();
                printw("%s", dd);
                refresh();
                attroff(COLOR_PAIR(1));
                i++;
                typed++;
                correct = 1;
                j = 0;
                strcpy(m, "");
            }
            else if (x == KEY_BACKSPACE || x == KEY_DC || x == 127 && correct == 0)
            {
                attron(COLOR_PAIR(1));
                clrtoeol();
                m[j - 1] = '\0';
                j--;
                printw("%s", dd);
                refresh();
                // printw("\b ");
                // refresh();
                attroff(COLOR_PAIR(1));
                attron(COLOR_PAIR(2));
                printw("%s", m);
                refresh();
                attroff(COLOR_PAIR(2));
                if (j == 0)
                {
                    correct = 1;
                }
            }
            else if (x == KEY_BACKSPACE || x == KEY_DC || x == 127 && correct == 1)
            {
                attron(COLOR_PAIR(1));
                clrtoeol();
                dd[i-1] = '\0';
                printw("%s", dd);
                // printw("\b ");
                refresh();
                attroff(COLOR_PAIR(1));
                i--;
                mistakes++;
            }
            else
            {

                attron(COLOR_PAIR(1));
                clrtoeol();
                printw("%s", dd);
                attroff(COLOR_PAIR(1));
                refresh();
                attron(COLOR_PAIR(2));
                m[j] = x;
                printw("%s", m);
                j++;
                mistakes++;
                correct = 0;
                attroff(COLOR_PAIR(2));
            }
            printw("\nType '%c'", c[i]);
            clrtoeol();
        }

        // printw("\n%s\n", c);
        refresh();
        attron(COLOR_PAIR(4));
        printw("\nTyped: %d\nMistakes: %d\n", typed, mistakes);
        float timeTaken = difftime(end_time, start_time);
        printw("Time taken: %.2f s\n", timeTaken);
        printw("WPM: %.2f\n", (60.0 * (((float)typed - mistakes) / (4.0 * x))) / timeTaken);
        printw("CPS: %.2f\n", (60.0 * ((((float)typed - mistakes)) / timeTaken)));
        attroff(COLOR_PAIR(4));
        attron(COLOR_PAIR(2));
        printw("Accuracy: %.2f%%\n", 100.0 - ((float)mistakes / typed) * 100);
        attroff(COLOR_PAIR(2));
        refresh();
        printw("Enter ESC or 'q to quit and 'r' to play again.\n");
        // char loop;
        rep = getch();
        while (1)
        {
            if (rep == 'r' || rep == 'q' || rep == 27)
            {
                break;
            }
            else
            {
                printw("Invalid input!\n");
                rep = getch();
            }
        }
        clear();
    }
    endwin();
    return 0;
}