int main file(4)

#include <iostream>
#include <iomanip>
#include <ctime>
#include <stdlib.h> //for exit() function
#include <fstream>  //for creating text file
using namespace std;

int total = 0;
int bookNum = 0;

//linklist of reservations sorted by booking number
linklist RBList;
void addRecord();
void updateRecord();
void deleteRecord();
void viewRecord();
void createTextFile();
bool checkName(string name);
int checkNoOfDigits(int phoneNo);
bool checkYear(int year);
bool checkMonth(int month, int year);
bool checkDay(int day, int month, int year);
bool checkTime(int time, int day, int month, int year);

int main() {
  char choice;
  cout << "===============RESTAURANT RESERVATION SYSTEM===============" << endl;
  cout << "Please enter your selection" << endl <<
    "1. Add Reservation Records" << endl <<
    "2. Update Reservation Records" << endl <<
    "3. Delete Reservation Records" << endl <<
    "4. View Reservation Records  " << endl <<
    "5. Create text file" << endl <<
    "6. Exit" << endl;

  cout << "Choice: ";
  cin >> choice;
  cin.clear();
  cin.ignore(1, '\n');
  system("CLS");

  switch (choice) {
  //Add Records
  case '1':
    addRecord();
    break;

  //Update Records
  case '2':
    if (total == 0) {
      cout << "No reservation records available." << endl;
      main();
    }
    updateRecord();

    break;

  //Delete Records
  case '3':
    if (total == 0) {
      cout << "No reservation records available." << endl;
      main();
    }
    deleteRecord();

    break;

  //View Reservation Records
  case '4':
    if (total == 0) {
      cout << "No reservation records available." << endl;
      main();
    }
    viewRecord();
    break;

  //Create Text File
  case '5':
    if (total == 0) {
      cout << "No reservation records available." << endl;
      main();
    }
    createTextFile();
    break;

  case '6':
    exit(1);
    break;

  default:
    cout << choice << " is not valid choice" << endl;
    main();
  }

  return 0;
}

//OPTION 1 : Add Reservation Records
void addRecord(){
  string name;
  int phoneNo, paxNo, day, month, year, time, date;
  int correct = 1;
  cout << "-----------------=ADD RECORD=-------------------" << endl;
  cout<<"Enter 0 to return to main menu."<<endl;
  do{
    cout<<"Enter name : ";
    getline(cin, name);
  }while(!checkName(name));

  if(name=="0"){
    cout << "Press enter to continue . . .";
    getchar();
    system("CLS");
    main();
  }

  cout<<endl<<"Enter phone number (e.g : 0123456789) : ";
  cin>>phoneNo;

  correct = 1;
  while (correct == 1){
    if (cin.fail() || phoneNo<0 || checkNoOfDigits(phoneNo)>11){
      cin.clear();
      cin.ignore();
      cout << "Invalid input! Enter positive numbers (maximum 11 digits)!" << endl<<endl;
      cout<< "Enter phone number (e.g : 0123456789) : ";
      cin >> phoneNo;
    }else{
      correct = 0;
    }
  }

  correct = 1;
  cout<<endl<<"Enter number of pax (maximum : 50) : ";
  cin>>paxNo;

  while (correct == 1){
    if (cin.fail() || paxNo<=0 || paxNo > 50){
      cin.clear();
      cin.ignore();
      cout << "Invalid input! Enter positive numbers (max : 50 , min : 1)!" << endl<<endl;
      cout<< "Enter number of pax (maximum : 50) : ";
      cin >> paxNo;
    }else{
      correct = 0;
    }
  }


  do{
    correct = 1;
    cout<<endl<<"Enter year (e.g : 2019): ";
    cin>>year;
    while (correct == 1){
      if (cin.fail() || year > 2021){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers (maximum year is 2021)!" << endl<<endl;
        cout<< "Enter year (e.g : 2019) : ";
        cin >> year;
        //reset if a year before 2019 was entered then 2022 or later is entered
      }else{
        correct = 0;
      }
    }
  }while(!checkYear(year));

  do{
    correct = 1;
    cout<<endl<<"Enter month (e.g : January = 1) : ";
    cin>>month;
    while (correct == 1){
      if (cin.fail()){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers!" << endl<<endl;
        cout<< "Enter month (e.g : January = 1) : ";
        cin >> month;
      }else{
        correct = 0;
      }
    }
  }while(!checkMonth(month, year));

  do{
    correct = 1;
    cout<<endl<<"Enter day : ";
    cin>>day;
    while (correct == 1){
      if (cin.fail()){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers!" << endl<<endl;
        cout<< "Enter day : ";
        cin >> day;
      }else{
        correct = 0;
      }
    }
  }while(!checkDay(day, month, year));

  do{
    correct = 1;
    cout<<endl<<"Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
    cin>>time;
    while (correct == 1){
      if (cin.fail()){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter positive numbers (maximum 4 digits)!" << endl<<endl;
        cout<< "Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
        cin >> time;
      }else{
        correct = 0;
      }
    }
  }while(!checkTime(time, day, month, year));

  bookNum++;
  cout<<endl<<"Booking Number : "<<bookNum<<endl;

  date = year*10000 + month*100 + day;

  RBList.InsNewNodeByBookNo(bookNum, name, phoneNo, paxNo, day, month, year, time, date);
  total++;
  cin.clear();
  cin.ignore(1000, '\n');
  cout << "Press enter to continue . . .";
  getchar();
  system("CLS");
  main();
}

//OPTION 2 : Update Reservation Records
void updateRecord(){
  string name;
  int bNo, phoneNo, paxNo, day, month, year, time, date;
  int correct = 1;
  cout << "----------------=UPDATE RECORD=-----------------" << endl;
  cout<<"Enter 0 to return to main menu."<<endl;
  cout << "Enter Booking Number : ";
  cin >> bNo;
  if(bNo == 0){
    cout << "Press enter to continue . . .";
    getchar();
    system("CLS");
    main();
  }

  if(RBList.checker(bNo)){
    RBList.deleteNode(bNo);
    cin.clear();
    cin.ignore(1000, '\n');

    cout<<endl;
    cout<<"Enter name : ";
    getline(cin, name);

    cout<<endl<<"Enter phone number (e.g : 0123456789) : ";
    cin>>phoneNo;

    correct = 1;
    while (correct == 1){
      if (cin.fail() || phoneNo<0 || checkNoOfDigits(phoneNo)>11){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter positive numbers (maximum 11 digits)!" << endl<<endl;
        cout<< "Enter phone number (e.g : 0123456789) : ";
        cin >> phoneNo;
      }else{
        correct = 0;
      }
    }

    correct = 1;
    cout<<endl<<"Enter number of pax (maximum : 50) : ";
    cin>>paxNo;

    while (correct == 1){
      if (cin.fail() || paxNo<=0 || paxNo > 50){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter positive numbers (max : 50 , min : 1)!" << endl<<endl;
        cout<< "Enter number of pax (maximum : 50) : ";
        cin >> paxNo;
      }else{
        correct = 0;
      }
    }

    do{
      correct = 1;
      cout<<endl<<"Enter year (e.g : 2019): ";
      cin>>year;
      while (correct == 1){
        if (cin.fail() || year > 2021){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers (maximum year is 2021)!" << endl<<endl;
          cout<< "Enter year (e.g : 2019) : ";
          cin >> year;
          //reset if a year before 2019 was entered then 2022 or later is entered
        }else{
          correct = 0;
        }
      }
    }while(!checkYear(year));

    do{
      correct = 1;
      cout<<endl<<"Enter month (e.g : January = 1) : ";
      cin>>month;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers!" << endl<<endl;
          cout<< "Enter month (e.g : January = 1) : ";
          cin >> month;
        }else{
          correct = 0;
        }
      }
    }while(!checkMonth(month, year));

    do{
      correct = 1;
      cout<<endl<<"Enter day : ";
      cin>>day;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers!" << endl<<endl;
          cout<< "Enter day : ";
          cin >> day;
        }else{
          correct = 0;
        }
      }
    }while(!checkDay(day, month, year));

    do{
      correct = 1;
      cout<<endl<<"Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
      cin>>time;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter positive numbers (maximum 4 digits)!" << endl<<endl;
          cout<< "Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
          cin >> time;
        }else{
          correct = 0;
        }
      }
    }while(!checkTime(time, day, month, year));

    //for finding the reservation by date
    date = year*10000 + month*100 + day;

    RBList.InsNewNodeByBookNo(bookNum, name, phoneNo, paxNo, day, month, year, time, date);
    cout<<"Update process complete."<<endl;
  }else{
    cout<<"No existing record with that booking number."<<endl
    <<"Update process cancelled."<<endl;
  }

  cin.clear();
  cin.ignore(1000, '\n');
  cout << "Press enter to continue . . .";
  getchar();
  system("CLS");
  main();
}

//OPTION 3 : Delete Reservation Records
void deleteRecord(){
  int  bNo;
  char confirm;
  cout << "----------------=DELETE RECORD=-----------------" << endl;
  cout<<"Enter 0 to return to main menu."<<endl;
  cout<<"Enter Booking Number : ";
  cin>>bNo;
  if(bNo == 0){
    cout << "Press enter to continue . . .";
    getchar();
    system("CLS");
    main();
  }
  if(RBList.checker(bNo)){
    RBList.PrintBookingNoRecords(bNo);
    cout<<"Confirm?(y/n) : ";
    cin>>confirm;

    switch (confirm) {
      case 'y':
        RBList.deleteNode(bNo);
        cout<<"Deletion process complete."<<endl;
        break;
      default:
        cout<<"Deletion process cancelled."<<endl;
        main();
    }
  }else{
    cout<<"No existing record with that booking number."<<endl;
  }

  cin.clear();
  cin.ignore(1000, '\n');
  cout << "Press enter to continue . . .";
  getchar();
  system("CLS");
  main();
}

//OPTION 4 : View Reservation Records
void viewRecord(){
  char choice;
  string name;
  int bNo, year, month, day, date, correct;
  cout << "-----------------=VIEW RECORD=------------------" << endl;
  cout << "Please enter your selection" << endl <<
  "1. View All Reservations(Sorted by Booking Number)" << endl <<
  "2. Search by Name" << endl<<
  "3. Search by Date"<< endl <<
  "4. Back to Main Menu"<< endl;
  cout << "Choice: ";
  cin >> choice;
  cin.clear();
  cin.ignore(1, '\n');
  system("CLS");

  switch (choice) {
  //View All Reservations
  case '1':
    RBList.PrintList();
    break;

  //Search by Name
  case '2':
    cout<<"Enter Name : ";
    getline(cin, name);

    RBList.PrintNameRecords(name);
    break;

  case '3':

    cout<<endl<<"Enter year (e.g : 2019): ";
    cin>>year;
    while (correct == 1){
      if (cin.fail() || year > 2021){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers (maximum year is 2021)!" << endl<<endl;
        cout<< "Enter year (e.g : 2019) : ";
        cin >> year;
      }else{
          correct = 0;
      }
    }

    correct = 1;
    cout<<endl<<"Enter month (e.g : January = 1) : ";
    cin>>month;
    while (correct == 1){
      if (cin.fail()){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers!" << endl<<endl;
        cout<< "Enter month (e.g : January = 1) : ";
        cin >> month;
      }else{
          correct = 0;
      }
    }

    cout<<endl<<"Enter day : ";
    cin>>day;
    while (correct == 1){
      if (cin.fail()){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter numbers!" << endl<<endl;
        cout<< "Enter day : ";
        cin >> day;
      }else{
          correct = 0;
      }
    }

    date = year*10000 + month*100 + day;

    RBList.PrintDateRecords(date);
    cin.clear();
    cin.ignore(1000, '\n');
    break;

  case '4':
    main();
    break;

  default:
    cout << choice << " is not valid choice" << endl;
    viewRecord();
  }

  cout << "Press enter to continue . . .";
  cin.clear();
  cin.ignore(1000, '\n');
  system("CLS");
  main();
}

//OPTION 5 : Create Text File
void createTextFile(){
  char choice;
  cout << "------------------=Create Txt File=------------------" << endl;
  cout << "Please enter your selection" << endl <<
  "1. Create Sort By Booking Number." << endl <<
  "2. Back to Main Menu"<< endl;
  cout << "Choice: ";
  cin >> choice;

  switch (choice) {
  //View All Reservations
  case '1':
    RBList.PrintListTextFile();
    break;

  case '2':
    main();
    break;

  default:
    cout << choice << " is not valid choice" << endl;
    viewRecord();
  }

  getchar();
  cout << "-----------------------------------------------------" << endl;

  cout << "Press enter to continue . . .";
  cin.clear();
  cin.ignore(1000, '\n');
  system("CLS");
  main();
}

//for checking whether the name is empty
bool checkName(string name){
  int counter = 0;
  bool found = true;
  if(name.find_first_not_of(" ") != std::string::npos){
    counter++;
  }

  if(name.find_first_not_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUV0") != std::string::npos){
    found = false;
  }else{
    found = true;
  }

  if(counter == 0 || !found){
    cout<<"Invalid Input! Need a name!"<<endl;
    return false;
  }else{
    return true;
  }
}

int checkNoOfDigits(int phoneNo){
  if (phoneNo == 0){
    return 0;
  }else{
    return 1 + checkNoOfDigits(phoneNo / 10);
  }
}

//for getting the current time
time_t now = time(0);
tm *ltm = localtime(&now);

int currentYear = 1900+ltm->tm_year;
int currentMonth = 1 + ltm->tm_mon;
int currentDay = ltm->tm_mday;
int currentHour = ltm->tm_hour;
int currentMinute = ltm->tm_min;

bool checkYear(int year){
  if(year < currentYear){
    cout<<"Can't go back in time!"<<endl;
    return false;
  }else{
    return true;
  }
}

bool checkMonth(int month, int year){
  if(month < currentMonth && year == currentYear){
    cout<<"Can't go back in time!"<<endl;
    return false;
  }else if(month > 12){
    cout<<"There are only 12 months in a year!"<<endl;
    return false;
  }else{
    return true;
  }
}

bool checkDay(int day, int month, int year){
  if(day < currentDay && month == currentMonth && year == currentYear){
    cout<<"Can't go back in time!"<<endl;
  //even months
  }else if(day <= 0){
    cout<<"Can't go back in time!"<<endl;
  }else if(month%2 == 0){
    // if the month is february
    if(month == 2){
      //february in common year that contain 28 days
      if(year%4 != 0 && day>28){
        cout << "Please key in between the day from 1 to 28"<< endl;
      }
      // february in leap year that contain 29 days
      else if(year%4 == 0 && day>29){
        cout << "Please key in between the day from 1 to 29"<< endl;
      }
      else{
        return true;
      }
    }
    // month that are even with 31 days
    else if(month > 7 && day > 31){
      cout << "Please key in between the day from 1 to 31"<< endl;
    }
    // month that are even  with 30 days
    else if(month < 7 && day > 30){
      cout << "Please key in between the day from 1 to 30"<< endl;
    }
    else{
      return true;
    }

  // month is odd
  }else if(month%2 != 0){
    // month that are odd with 30 days
    if(month>8 && day > 30){
      cout << "Please key in between the day from 1 to 30"<< endl;
    // month that are odd with 31 days
    }else if(month<8 && day > 31){
      cout << "Please key in between the day from 1 to 31"<< endl;
    }else{
      return true;
    }
  }
  else{
    return true;
  }
  return false;
}

bool checkTime(int time, int day, int month, int year){
  int hour = time/100;
  int minute = time - hour*100;

  if(hour > 24){
    cout<<"Only 0 to 24 hours."<<endl;
    return false;
  }else if(hour < currentHour && day == currentDay && month == currentMonth && year == currentYear){
    cout<<"Can't go back in time!"<<endl;
    return false;
  }else if(minute > 59){
    cout<<"Only 0 to 59 minutes."<<endl;
  }else if(minute < currentMinute && hour == currentHour && day == currentDay && month == currentMonth && year == currentYear){
    cout<<"Can't go back in time!"<<endl;
  }else{
    return true;
  }
  return false;
}