This is more or less what i intend to implement, not final.

• User:

  • role: usertype
  • firstName: string
  • lastName: string
  • id: UUID

• Flight:

  • DepartureCountry: string

  • DestinationCountry: string

  • DepartureDate: Date

  • ArrivalDate: Date

  • ArrivalAirport: string / UUID

  • DepartureAirport: string / UUID

  • AvailableClasses: FlightClass

  • AvailableSeats: Dict<FlightClass, int>

  • PricePerClass: Dict<FlightClass, Decimal>

  • id: uuid

  • getConstraints()

• Airport ?:

  • id: UUID
  • name: string
  • Country: string

• Bookings:

  • id: UUID
  • UserID: UUID
  • flightID: UUID
  • bookedClass: FlightClass
  • Satus: BookingStatus

• commands:

  • launch()
    first thing when executing app, ask for name for login, create user f not found and user wants.

  • searchFlights
    // ask to filter, list parameters, enter parameter selected, ask for Nth parameter, repeat if yes, return foound flighs

  • bookFlight
    do searchflight, let user select desired flight, ask for class, done

  • ManageBookings() ask for

    • modifyBooking, let change class, and pay price
    • Cancelbooking
    • viewBookings

  • displaybookings // ask for parameters to filter

  • uploadFlights // ask for file url

  • verifyLastUploadedFlightData

  • diplayFlightDataConstraints

• Repository:

  • getUserOrDefault()
  • getAllFlights()
  • getFlightsWhere()
  • getBookings
  • getBookingsWhere()
  • validateFlights()
  • importFlights()

• FlightClass: Enum

  • economy
  • economy plus
  • business
  • first class

• UserType: Enum

  • admin
  • client

Develop a .NET console application for an airport ticket booking system. This application should enable passengers to book flight tickets and allow a manager to manage the bookings.

• Use the file system as the data storage layer.

1. Book a Flight:
   • Select a flight based on various search parameters.
   • Choose a class for the flight (Economy, Business, First Class). Prices should vary according to the class selected.
2. Search for Available Flights:
   • Parameters:
     • Price
     • Departure Country
     • Destination Country
     • Departure Date
     • Departure Airport
     • Arrival Airport
     • Class
3. Manage Bookings:
   • Cancel a booking
   • Modify a booking
   • View personal bookings

1. Filter Bookings:
   • Parameters:
     • Flight
     • Price
     • Departure Country
     • Destination Country
     • Departure Date
     • Departure Airport
     • Arrival Airport
     • Passenger
     • Class
2. Batch Flight Upload:
   • Import a list of flights into the system using a CSV file.
3. Validate Imported Flight Data:
   • Apply model-level validations to the imported file data.
   • Return a detailed list of errors to help the manager identify and rectify issues in the imported file.
4. Dynamic Model Validation Details:
   • Provide dynamically generated details about the validation constraints for each field of the flight data model.
   • Example Result:
     • Departure Country:
       • Type: Free Text
       • Constraint: Required
     • Departure Date:
       • Type: Date Time
       • Constraint: Required, Allowed Range (today → future)

• Ensure the application is well-structured, readable, and maintainable.
• Apply best practices and conventions of C# programming.

• 3 days