main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// check OS for platform specific things
#if defined(_WIN32)
#include <windows.h>        // necessary header for windows
#define clr() system("cls") // clear terminal for windows
#else
#define clr() system("clear") // clear terminal for linux
#endif

#define TOTAL_SEATS 20
#define TOTAL_ROUTES 3
#define PASS_LEN 13

void init();        // necessary initializations
void welcome_msg(); // welcome message
void chose_route(); // chose route
void book_seat();   // book seats
void admin_panel(); // admin panel
char *gen_token(char *name, char *destination, int n_seats, char *token,
                int c_count);        // generate token
void view_booked_seats(int c_count); // view booked seats
void delete_by_token(char *token);   // delete booked seat
int check_admin_pass();              // check admin password
void change_admin_pass();            // change password
int search_by_token(char *token);    // search/view booking using token

struct data // to store customer data
{
  char name[50];
  char destination[100];
  int cost_per_seat;
  int n_seats;
  int booked_seats[TOTAL_SEATS];
  char token[7];
};
struct data c_data[TOTAL_SEATS]; // create a array of struct data

char routes[TOTAL_ROUTES][100] = {
    "Chashara to Signboard", "Chashara to Gulisthan", "Earth to Mars        "};
int cost[TOTAL_ROUTES] = {40, 60, 11};
int check_seat[TOTAL_SEATS];
int available_seats = TOTAL_SEATS;
int booked_seats = 0;
int n_seat;
int c_count = 0;
int c_existence[TOTAL_SEATS];
char admin_pass[PASS_LEN] = "admin";

int main() {
  int choice;
  init();
  welcome_msg();
  while (1) {
    printf("\tEnter your choice:\n");
    printf("\t1. Book a seat\n");
    printf("\t2. Admin panel\n");
    printf("\t3. Exit\n");
    printf("\n\t>> ");
    scanf("%d", &choice);
    getchar();
    fflush(stdin);
    clr();
    if (choice == 1) {

      book_seat(); // book seats
    } else if (choice == 2) {
      switch (check_admin_pass()) {
      case 1:
        admin_panel();
        break;
      }
    } else if (choice == 3) {
      printf("\tBe aware: By exiting you will lose all your data!\n\n");
      printf("\t-> Press 'ctrl + c' anytime to terminate the program (lose "
             "runtime data).\n");
      printf("\t-> Press 'enter' to continue using the program (keep runtime "
             "data).\n");
      printf("\n\t");
      getchar();
      fflush(stdin);
      clr();
    } else {
      printf("\tInvalid choice!\n\n");
      printf("\tPress 'enter' to continue!\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
      continue;
    }
  }

  return 0;
}
int search_by_token(char *token) {
  for (int i = 0; i < TOTAL_SEATS; i++) // loop through all struct array
  {
    if (strcmp(token, c_data[i].token) == 0 &&
        c_existence[i] == 1) // check if match with any booked customer
    {
      printf("\tToken No.: %s\n", c_data[i].token);
      printf("\tName: \t%s\n", c_data[i].name);
      printf("\tDestination: %s\n", c_data[i].destination);
      printf("\tNumber of seats: %d\n", c_data[i].n_seats);
      printf("\tBooked seats No.: ");
      for (int j = 0; j < c_data[i].n_seats; j++) {
        printf("%d, ", c_data[i].booked_seats[j]);
      }
      printf("\n");
      printf("\tTotal cost: %dtk\n",
             c_data[i].n_seats * c_data[i].cost_per_seat);
      return 1;
    }
  }
  return 0;
}
void change_admin_pass() {
  char pass[50] = "";
  printf("\tEnter current password:\n");
  printf("\t>> ");
  fgets(pass, sizeof(pass), stdin);
  pass[strlen(pass) - 1] = '\0'; // remove newline character
  fflush(stdin);
  clr();

  if (strcmp(pass, admin_pass) == 0) {
    printf("\n\t(Password matched!)\n\n");
    while (1) {
      printf("\tEnter new password [>4,<8]:\n");
      printf("\t>> ");
      fgets(pass, sizeof(pass), stdin);
      pass[strlen(pass) - 1] = '\0'; // remove newline character
      fflush(stdin);
      clr();
      if (strlen(pass) < 4 || strlen(pass) > PASS_LEN - 1) {
        printf(
            "\tPassword must have to be between 4 and 12 characters long!\n\n");
        printf("\tPress 'enter' to continue!\n");
        printf("\t");
        getchar();
        fflush(stdin);
        clr();
        continue;
      } else {
        strcpy(admin_pass, pass); // save new password
        break;
      }
    }
    printf("\tPassword changed successfully!\n\n");
    printf("\tPress 'enter' to continue!\n");
    printf("\t");
    getchar();
    fflush(stdin);
    clr();
  } else {
    clr();
    printf("\tWrong password!\n\n");
    printf("\tPress 'enter' to continue!\n");
    printf("\t");
    getchar();
    fflush(stdin);
    clr();
  }
}
int check_admin_pass() {
  char pass[9];
  printf("\tEnter password:\n");
  printf("\t>> ");
  fgets(pass, sizeof(pass), stdin);
  pass[strlen(pass) - 1] = '\0'; // remove newline character
  fflush(stdin);
  clr();

  if (strcmp(pass, admin_pass) == 0) {
    return 1;
  } else {
    printf("\tWrong password!\n\n");
    printf("\tPress 'enter' to continue!\n");
    printf("\t");
    getchar();
    fflush(stdin);
    clr();
    return 0;
  }
}

void delete_by_token(char *token) {
  int digit;
  digit = ((token[0] - 48) * 10) + (token[1] - 48);
  if (c_existence[digit - 1] == 0) {
    clr();
    printf("\tInvalid token!\n\n");
  } else if (strcmp(token, c_data[digit - 1].token) == 0) {
    c_existence[digit - 1] = 0; // set existence to 0/false
    // delete booked seats
    for (int i = 0; i < c_data[digit - 1].n_seats; i++) {
      check_seat[c_data[digit - 1].booked_seats[i] - 1] =
          1; // set seat to available
    }
    available_seats += c_data[digit - 1].n_seats; // add available seats
    booked_seats -= c_data[digit - 1].n_seats;    // remove booked seats
    c_count--;                                    // decrease customer count
    c_data[digit - 1].token[0] = '\0';            // clear token
    clr();
    printf("\tDeleted successfully!\n\n");
  } else {
    clr();
    printf("\tNo such token exists!\n\n");
  }
}

char *gen_token(char *name, char *destination, int n_seats, char *token,
                int c_count) {
  char first_two_str[3];                   // to store 2 byte of str
  sprintf(first_two_str, "%02d", c_count); // str = 12
  strcat(token, first_two_str);            // token = 12xxxx
  strncat(token, name, 1);                 // token = 123xxx
  strncat(token, destination, 1);          // token = 1234xx
  char last_two_str[3];
  sprintf(last_two_str, "%02d", n_seats); // str = 56
  strcat(token, last_two_str);            // token = 123456
  return token;
}
void init() {
  { // to check bus seats availability
    for (int i = 0; i < TOTAL_SEATS; i++) {
      check_seat[i] = 1; // 1 means available
    }
  }

  { // to do list booked customers
    for (int i = 0; i < TOTAL_SEATS; i++) {
      c_existence[i] = 0; // 0 means doesn't exists
    }
  }
}

void admin_panel() {
  int choice;
  while (1) {
    printf("\t1. View all booked seats\n");
    printf("\t2. Search/View Ticket (Using Token)\n");
    printf("\t3. Cancel Ticket (Using Token)\n");
    printf("\t4. Change password\n");
    printf("\t5. Back\n");
    printf("\n\t>> ");
    scanf("%d", &choice);
    getchar();
    fflush(stdin);
    if (choice == 1) {
      clr();
      view_booked_seats(c_count);
    } else if (choice == 2) {
      clr();
      if (c_count > 0) {
        char token[7];
        printf("\tEnter token No.:\n");
        printf("\t>> ");
        fgets(token, sizeof(token), stdin);
        getchar();
        fflush(stdin);
        clr();

        if (search_by_token(token)) {
          printf("\tPress 'enter' to continue...\n");
          printf("\t");
          getchar();
          fflush(stdin);
        } else {
          printf("\tNo such token exists!\n\n");
          printf("\tPress 'enter' to continue!\n");
          printf("\t");
          getchar();
          fflush(stdin);
        }
        clr();
      } else {
        printf("\tNo seats booked yet!\n\n");
        printf("\tPress 'enter' to continue!\n");
        printf("\t");
        getchar();
        fflush(stdin);
        clr();
      }
    } else if (choice == 3) {
      // get token input
      clr();
      if (c_count > 0) {
        char token[7];
        printf("\tEnter token No.:\n");
        printf("\t>> ");
        fgets(token, sizeof(token), stdin);
        fflush(stdin);
        getchar();
        clr();
        delete_by_token(token); // pass the token to another function
        printf("\tPress 'enter' to continue...\n");
        printf("\t");
        getchar();
        fflush(stdin);
        clr();
      } else {
        clr();
        printf("\tNo seats booked yet!\n\n");
        printf("\tPress 'enter' to continue!\n");
        printf("\t");
        getchar();
        fflush(stdin);
        clr();
      }
    } else if (choice == 4) {
      clr();
      change_admin_pass();
      break;
    } else if (choice == 5) {
      clr();
      break;
    } else {
      printf("\tInvalid choice!\n\n");
      printf("\tPress 'enter' to continue!\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
    }
  }
}

void view_booked_seats(int c_count) {
  if (c_count == 0) {
    printf("\tNo seats booked yet!\n\n");
    printf("\tPress 'enter' to continue!\n");
    printf("\t");
    getchar();
    fflush(stdin);
    clr();
  } else {
    printf("\n\t(Serial No. > Token No. > Booked by > Destination > No. of "
           "booked seats)\n\n");
    printf("\t-----------------------------------------------------------------"
           "-------\n\n");
    // show all booked seats
    for (int i = 0, j = 0; i < TOTAL_SEATS && j < c_count; i++) {
      if (c_existence[i] == 1) {
        // show only if customer exists
        printf("\t\t%d. > %s > %s > %s > %d\n\n", (j + 1), c_data[i].token,
               c_data[i].name, c_data[i].destination, c_data[i].n_seats);
        j++; // only increment if customer exists
      }
    }
    printf("\t-----------------------------------------------------------------"
           "-------\n\n");
    printf("\n");
    printf("\tPress 'enter' to continue!\n");
    printf("\t");
    getchar();
    fflush(stdin);
    clr();
  }
}

void book_seat() {
  int seat_no;

  printf("\tEnter your name: \n");
  printf("\t>> ");
  fgets(c_data[c_count].name, sizeof(c_data[c_count].name), stdin);
  c_data[c_count].name[strlen(c_data[c_count].name) - 1] = '\0';
  clr();
  chose_route(); // get destination
  while (1) {
    clr();
    printf("\tHow many seat you want to book:\n");
    printf("\t>> ");
    scanf("%d", &n_seat);
    if (n_seat > available_seats) {
      printf("\tSorry! Only %d seats are available!\n\n", available_seats);
      continue;
    } else {
      c_data[c_count].n_seats = n_seat;
      clr();
      break;
    }
  }

  while (n_seat > 0) {
    // visualize seats
    printf("\n\tAvailable seats:\t\n\n");
    printf("\t============================\n");
    for (int i = 0; i < TOTAL_SEATS; i += 4) {
      printf("\t------------\t------------\n");
      if (check_seat[i] == 1) {
        printf("\t (%d)  ", i + 1);
      } else {
        printf("\t (X)  ");
      }

      if (check_seat[i + 1] == 1) {
        printf("(%d) \t ", i + 2);
      } else {
        printf("(X) \t ");
      }

      if (check_seat[i + 2] == 1) {
        printf("(%d)  ", i + 3);
      } else {
        printf("(X)  ");
      }
      if (check_seat[i + 3] == 1) {
        printf("(%d) \n", i + 4);
      } else {
        printf("(X) \n");
      }

      printf("\t------------\t------------\n");
    }
    printf("\t============================\n\n");

    printf("\tEnter a seat number to book:\n");
    printf("\t>> ");
    scanf("%d", &seat_no);
    getchar();
    fflush(stdin);
    clr();

    if (seat_no > TOTAL_SEATS || seat_no < 0) {
      printf("\tInvalid seat number!\n\n");
      printf("\tPress 'enter' to show available seats...\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
      continue;
    }
    // check if seat is booked or not
    else if (check_seat[seat_no - 1] == 0) {
      clr();
      printf("\tThis seat is already booked,\n\tPlease choose another seat!\n");
      continue;
    } else {
      c_data[c_count].booked_seats[c_data[c_count].n_seats - n_seat] = seat_no;
      check_seat[seat_no - 1] = 0;
      booked_seats++;
      available_seats--;
      n_seat--;
    }
    clr();
  }
  // confirmation of booking

  printf("\n");
  /* idk what causing a bug here, which including a '>>' while entering multiple
  seats together to solve that i had to include this linebreak. which seems to
  work */

  clr();
  printf("\tName: \t%s\n", c_data[c_count].name);
  printf("\tDestination: %s\n", c_data[c_count].destination);
  printf("\tNumber of seats: %d\n", c_data[c_count].n_seats);
  printf("\tSeats for booking: ");
  for (int i = 0; i < c_data[c_count].n_seats; i++) {
    printf("%d, ", c_data[c_count].booked_seats[i]);
  }
  printf("\n");
  printf("\tTotal cost: %dtk\n",
         c_data[c_count].n_seats * c_data[c_count].cost_per_seat);
  printf("\n\tDo you want to confirm booking? (y/n)\n");
  printf("\t>> ");
  char ch;
  while (1) {
    scanf("%c", &ch);
    getchar();
    fflush(stdin);

    if (ch == 'y' || ch == 'Y') {
      clr();
      c_count++;                // increase customer count
      c_existence[c_count] = 1; // make customer existence 1/true
      // generate token number
      gen_token(c_data[c_count - 1].name, c_data[c_count - 1].destination,
                c_data[c_count - 1].n_seats, c_data[c_count - 1].token,
                c_count);

      // print confirmation message
      printf("\n\tBooking confirmed!\n\n");
      printf("\tYour token number is: %s", c_data[c_count - 1].token);
      printf("\n\t(Please keep this token number safe!)\n\n");
      printf("\tPress 'Enter' to continue...\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
      break;
    } else if (ch == 'n' || ch == 'N') // cancel booking
    {
      clr();
      // reset check_seat array
      for (int i = 0; i < c_data[c_count].n_seats; i++) {
        check_seat[c_data[c_count].booked_seats[i] - 1] = 1;
      }

      // reset variables
      booked_seats -= c_data[c_count].n_seats;
      available_seats += c_data[c_count].n_seats;

      printf("\tBooking canceled!\n\n");
      printf("\tPress 'Enter' to continue...\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
      break;
    } else {
      printf("\n\tInvalid input!\n\n");
      fflush(stdin);
      printf("\t(if it is Yes enter 'y' or 'Y' and if it is No enter 'n' or "
             "'N')\n\n");
      printf("\tDo you want to confirm booking? (y/n)\n");
      printf("\t>> ");
    }
  }
}

void chose_route() {
  printf("\tAvailable Routes: \n");
  printf("\t---------------------------------------\n");
  printf("\t| SN |        Destinations     | Cost |\n");
  printf("\t---------------------------------------\n");

  for (int i = 0; i < TOTAL_ROUTES; i++) {

    printf("\t| %d | %s    | %dtk |\n", i + 1, routes[i], cost[i]);
    printf("\t---------------------------------------\n");
  }

  int i;
  while (1) {

    printf("\n\tChose your destination: \n");
    printf("\t>> ");
    scanf("%d", &i);
    getchar();
    fflush(stdin);
    clr();
    if (i > 0 && i <= TOTAL_ROUTES) {
      strcpy(c_data[c_count].destination, routes[i - 1]);
      c_data[c_count].cost_per_seat = cost[i - 1];
      break;
    } else {

      printf("\n\tInvalid choice!\n");
      printf("\tPlease chose from the table above!\n\n");
      printf("\tPress 'Enter' to continue!\n");
      printf("\t");
      getchar();
      fflush(stdin);
      clr();
      continue;
    }
  }
}

void welcome_msg() {
  clr();
  printf("\t==========================================\n");
  printf("\t=====~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=====\n");
  printf("\t|    Welcome to Chashara Bus Terminal    |\n");
  printf("\t=====~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=====\n");
  printf("\t==========================================\n\n");
  printf("\tPress 'Enter' to continue...\n");
  printf("\t");
  getchar();
  fflush(stdin);
  clr();
}