#include <iostream>
#include <fstream>>
#include <string.h>

using namespace std;

class Passengers
{
public:
    char name[20];
    int id, age;
    char destination[30];

    void WriteText()
    {
        ofstream out;
        out.open("test.txt", ios::out | ios::app);
        if (out.is_open())
        {
            out << "hello guys"
                << "\n";
            out.close();
        }
        else
        {
            cout << "file can't be found"
                 << "\n";
        }
    }

    void ReadText()
    {
        char c, str[20];
        fstream in;
        in.open("test.txt", ios::in);
        if (in.is_open())
        {
            in >> str;
            cout << str;
            in.get(c);
            cout << c;
            in.get(str, 20);
            cout << str;
            in.close();
        }
        else
        {
            cout << "file is not found"
                 << "\n";
        }
    }

    void writePassenger()
    {
        char ch;
        fstream outfile;
        outfile.open("Passengers.txt", ios::out | ios::app);
        if (outfile.is_open())
        {
            Passengers p1;
            do
            {
                cout << "enter passenger's id : ";
                cin >> p1.id;
                cout << "enter passenger's name : ";
                cin >> p1.name;
                cout << "enter passenger's age : ";
                cin >> p1.age;
                cout << "enter passenger's destination : ";
                cin >> p1.destination;
                cout << "passenger's Information have been saved successfully"
                     << "\n";
                cout << "do you want to enter new passengers (y/n) : ";
                cin >> ch;
                outfile.write((char *)&p1, sizeof(p1));
            }
            while (ch == 'y');
            outfile.close();
        }
        else
        {
            cout << "file is not found"
                 << "\n";
        }
    }

    void Readpassengers()
    {

        Passengers p1;
        fstream in;
        int id = 0;
        in.open("Passengers.txt", ios::in);
        if (in.is_open())
        {
            cout << "ID"
                 << "\t"
                 << "name"
                 << "\t"
                 << "age"
                 << "\t"
                 << "Destination"
                 << "\n";
            in.read((char *)&p1, sizeof(p1));
            while (!in.eof())
            {
                if (p1.id != id)
                {
                    cout << p1.id << "\t" << p1.name << "\t" << p1.age << "\t" << p1.destination << "\n";
                    in.read((char *)&p1, sizeof(p1));
                }
            }
            in.close();
        }
        else
        {
            cout << "file is not found"
                 << "\n";
        }
    }

    void SearchforName()
    {
        bool found = false;
        char str[20];
        cout << "write a name to search for : ";
        cin >> str;
        Passengers p1;
        fstream in;
        int id = 0;
        in.open("Passengers.txt", ios::in);
        if (in.is_open())
        {

            in.read((char *)&p1, sizeof(p1));
            while (!in.eof())
            {
                if (strcmp(str, p1.name) == 0)
                {
                    cout << "ID"
                         << "\t"
                         << "name"
                         << "\t"
                         << "age"
                         << "\t"
                         << "Destination"
                         << "\n";
                    cout << p1.id << "\t" << p1.name << "\t" << p1.age << "\t" << p1.destination << "\n";
                    found = true;
                }
                in.read((char *)&p1, sizeof(p1));
            }
            if (!found)
            {
                cout << "Name is not found"
                     << "\n";
            }
            in.close();
        }
        else
        {
            cout << "file is not found"
                 << "\n";
        }
    }

    void CalculateLength()
    {
        fstream in;
        in.open("test.txt", ios::in);
        if (in.is_open())
        {
            in.seekg(0, ios::end);
            cout << "the length of the file is : " << in.tellg();
            in.close();
        }
    }

    void CopyContent()
    {
        char ch;
        fstream in;
        fstream out;
        in.open("test.txt", ios::in);
        out.open("copy test.txt", ios::out);
        if (in.is_open())
        {
            while (in.get(ch))
                out.put(ch);
            in.close();
            out.close();
        }
    };

    void updatepassenger()
    {
        bool found = false;
        char name[20];
        cout << "Enter the name of the passenger to update: ";
        cin >> name;

        Passengers p;
        fstream file;
        file.open("Passengers.txt", ios::in | ios::out | ios::binary);

        if (file.is_open())
        {
            while (!file.eof())
            {
                streampos pos = file.tellg();
                file.read((char*)&p, sizeof(p));

                if (strcmp(p.name, name) == 0)
                {
                    cout << "What do you want to update? (name/age/id/destination): ";
                    char field[20];
                    cin >> field;

                    if (strcmp(field, "name") == 0)
                    {
                        char new_name[20];
                        cout << "Enter the new name: ";
                        cin >> new_name;
                        strcpy(p.name, new_name);
                    }
                    else if (strcmp(field, "age") == 0)
                    {
                        int new_age;
                        cout << "Enter the new age: ";
                        cin >> new_age;
                        p.age = new_age;
                    }
                    else if (strcmp(field, "id") == 0)
                    {
                        int new_id;
                        cout << "Enter the new id: ";
                        cin >> new_id;
                        p.id = new_id;
                    }
                    else if (strcmp(field, "destination") == 0)
                    {
                        char new_dest[30];
                        cout << "Enter the new destination: ";
                        cin >> new_dest;
                        strcpy(p.destination, new_dest);
                    }
                    else
                    {
                        cout << "Invalid field name. Please try again." << endl;
                        return;
                    }

                    file.seekp(pos);
                    file.write((char*)&p, sizeof(p));
                    found = true;
                    cout << "Passenger updated successfully." << endl;
                    break;
                }
            }
            if (!found)
            {
                cout << "Passenger not found." << endl;
            }
            file.close();
        }
        else
        {
            cout << "File not found." << endl;
        }
    }

    void deletepassenger()
    {
        Passengers p1;
        p1.Readpassengers();

        bool found = false;
        char str[20];
        cout << "write a name to delete : ";
        cin >> str;
        fstream in;
        fstream out;
        out.open("temp.txt", ios::out);
        int id = 0;
        in.open("Passengers.txt", ios::in);
        if (in.is_open())
        {

            in.read((char *)&p1, sizeof(p1));
            while (!in.eof())
            {
                if (strcmp(str, p1.name) != 0)
                {
                    out.write((char *)&p1, sizeof(p1));
                    found = true;
                }
                in.read((char *)&p1, sizeof(p1));
            }
            if (!found)
                cout << "Name is not found"
                     << "\n";

            in.close();
            out.close();
            remove("Passengers.txt");
            rename("temp.txt", "Passengers.txt");
        }
        else
        {
            cout << "file is not found"
                 << "\n";
        }
        p1.Readpassengers();
    }
};
int main()
{
    Passengers p1;
    int ch;
    do
    {
        cout << "------------BUS RESERVATION SYSTEM---------------"
             << "\n";
        cout << "(Choose one of these to do)"
             << "\n";
        cout << "1 - Enter new passenger"
             << "\n";
        cout << "2 - View all passengers"
             << "\n";
        cout << "3 - Search for a passenger"
             << "\n";
        cout << "4 - Change passenger information"
             << "\n";
        cout << "5 - Delete a passenger"
             << "\n";
        cout << "6 - Exit"
             << "\n";
        cout << "Your choice : ";
        cin >> ch;

        switch (ch)
        {
        case 1:
            p1.writePassenger();
            break;
        case 2:
            p1.Readpassengers();
            break;
        case 3:
            p1.SearchforName();
            break;
        case 4:
            p1.updatepassenger();
            break;
        case 5:
            p1.deletepassenger();
            break;
        case 6:
            cout << "\n Thanks for using our System , we hope you like it :)"
                 << "\n";
            return 0;
        }
    }
    while (ch >= 1 && ch <= 6);

    if (ch < 1 || ch > 6)
    {
        cout << "\n please choose one of the shown choices"
             << "\n"
             << "\n";
        do
        {
            cout << "------------BUS RESERVATION SYSTEM---------------"
                 << "\n";
            cout << "((Choose one of these to do))"
                 << "\n";
            cout << "1 - Enter new passenger"
                 << "\n";
            cout << "2 - View all passengers"
                 << "\n";
            cout << "3 - Search for a passenger"
                 << "\n";
            cout << "4 - Change passenger information"
                 << "\n";
            cout << "5 - Delete a passenger"
                 << "\n";
            cout << "6 - Exit"
                 << "\n";
            cout << "Your choice : ";
            cin >> ch;

            switch (ch)
            {
            case 1:
                p1.writePassenger();
                cout << "\n";
                break;
            case 2:
                p1.Readpassengers();
                cout << "\n";
                break;
            case 3:
                p1.SearchforName();
                cout << "\n";
                break;
            case 4:
                p1.updatepassenger();
                cout << "\n";
                break;
            case 5:
                p1.deletepassenger();
                cout << "\n";
                break;
            case 6:
                cout << "\n Thanks for using our System , we hope you like it :)"
                     << "\n";
                return 0;
            }
        }
        while (ch > 6 || ch < 1);
    }

    return 0;
}