CRC Cards (Part 3)

AddEventFragment

Responsibilities	Collaborators
Display UI for adding a new event to the database	EventController
Handle user input for event details	UserController
Validate user input and display appropriate error messages	NavController
Communicate with EventController to add the new event	ImageController
Retrieve current user's information to set as organizer	Uri
Handle navigation between fragments using NavController	Intent
Open device's gallery to allow user to pick an image	Toast
Upload selected image to Firebase Storage
Handle success and failure callbacks for image upload
Set event's poster URI to the uploaded image URI
Implement onClick listeners for buttons

Administrator

Responsibilities	Collaborators
Initialize a user with administrative permissions	User

Attendee

Responsibilities	Collaborators
Initialize an attendee instance for a user joining an event	User
Get and set the user associated with the attendee	Event
Get and set the event associated with the attendee
Get and set the check-in status of the attendee
Get and set the location of the attendee's check-in
Get and set the ID of the attendee

AttendeeAddCallback

Responsibilities	Collaborators
Define a callback method for successful addition of an attendee	Attendee
Define a callback method for handling errors during attendee addition	Exception

AttendeeController

Responsibilities	Collaborators
Manage operations related to attendee management in a Firestore database	FirebaseFirestore
Get the instance of the Firestore database	Attendee
Add a new attendee to the Firestore database

AttendeeFetchCallback

Responsibilities	Collaborators
Define a callback method for successful fetching of an attendee	Attendee
Define a callback method for handling errors during attendee fetching	Exception

AttendeeUpdateCallback

Responsibilities	Collaborators
Define a callback method for successful attendee update
Define a callback method for handling errors during attendee update	Exception

Capture

Responsibilities	Collaborators
Extend CaptureActivity class for barcode scanning.	CaptureActivity

EditEventFragment

Responsibilities	Collaborators
Display UI for editing existing events in the database	EventController
Prefill forms with existing event data	Glide
Handle user input for editing event details	Activity, Intent, Uri
Validate user input and display appropriate error messages	Toast
Communicate with EventController to edit the event	NavController
Get the instance of the current user	UserController
Fetch event details by its ID	ImageController
Upload selected image to Firebase Storage	FirebaseFirestore
Handle success and failure callbacks for image upload
Implement onClick listeners for buttons

EditProfileFragment

Responsibilities	Collaborators
Display UI for editing and updating user profile information	ImageController, UserController, NavController, UserFetchCallback, UserUpdateCallback
Handle user input for profile details	ActivityResultLauncher, Intent, Uri
Open device's gallery to allow user to pick a new profile image	Toast
Upload selected image to Firebase Storage and update user's profile image URL	ImageController
Fetch current user details from Firestore/Internal storage and display them in UI components	UserController, UserFetchCallback
Save updated user details to Firestore and update local user serialization	User, UserController, UserUpdateCallback
Implement onClick listeners for buttons	NavController

Event

Responsibilities	Collaborators
Store event data including name, description, etc.	User
Manage event organizer	Uri
Manage event participants	Attendee
Manage event location	Bitmap
Manage maximum number of attendees
Manage event sign-up address
Manage event information address
Manage event QR code for event
Manage event QR code for attendee check-in
Manage event poster URI

EventController

Responsibilities	Collaborators
Manage operations related to events in Firestore	Event, User, Attendee
Add a new event to the Firestore database	FirebaseFirestore
Get the Firestore database instance for events	FirebaseStorage
Get events organized by a specific user	UserController
Get an event by its ID	EventFetchCallback
Edit an existing event in the database	View
Fetch the organizer of an event by reference	DocumentReference, UserFetchCallback

EventDetailsFragment

Responsibilities	Collaborators
Display details of an event	Event, User, UserController , Glide
Navigate back to the events page	NavController
Fetch event details from Firestore	EventController
Fetch organizer details from Firestore	FirebaseFirestore
Implement editing of event details	UserFetchCallback

EventFetchByUserCallback

Responsibilities	Collaborators
Handle successful retrieval of event list	ArrayList, Event
Handle errors occurring during retrieval process	Exception

EventFetchCallback

Responsibilities	Collaborators
Handle successful retrieval of an event	Event
Handle errors occurring during retrieval process	Exception

EventPageFragment

Responsibilities	Collaborators
Display list of events	ListView, ArrayAdapter
Navigate to event details page when an event is selected	NavHostFragment
Retrieve events from Firestore database	EventController
Handle successful retrieval of events	ArrayList, EventFetchByUserCallback
Handle errors occurring during retrieval process	Exception
Navigate to add event page when addEventButton is clicked	NavController

ImageController

Responsibilities	Collaborators
Upload an image file to Firebase Storage	FirebaseStorage
Fetch the download URL of an image from Firebase Storage	StorageReference
Handle successful image upload operations	UploadTask
Handle failed image upload operations
Handle successful image retrieval operations
Handle failed image retrieval operations

MainActivity

Responsibilities	Collaborators
Set up navigation for the main activity	NavController
Initialize the navigation controller	NavHostFragment
Load the navigation host fragment layout	AppCompatActivity
Create the main activity	SplashScreen
Handling displaying the splash screen at start up

ProfileFragment

Responsibilities	Collaborators
Display user profile information	FirebaseFirestore, Glide
Navigate to other parts of the application	NavController, NavHostFragment
Fetch user details from Firebase/Internal storage	UserController
Initialize view components and set up button listeners	ImageView, FloatingActionButton, TextView

QrCodeController

Responsibilities	Collaborators
Generate QR code from event ID	QRCodeWriter, BitMatrix
Convert Bitmap to byte array for storage or transmission	ByteArrayOutputStream, Bitmap

QrScannerController

Responsibilities	Collaborators
Handle QR code scanning	ScanOptions
Add events using QR codes or perform check-ins

RoleSelectFragment

Responsibilities	Collaborators
Control user role selection screen	FirebaseFirestore, NavController, Toast
Add user to Firestore based on selected role	UserController, User, Administrator, UserAddCallback, NavHostFragment

SignupFragment

Responsibilities	Collaborators
Control user sign up screen	FirebaseFirestore, Toast
Check if username is already taken	UserController, UsernameCheckCallback
Navigate to the next action if username is not taken	NavController, NavHostFragment

User

Responsibilities	Collaborators
Store user information including username, first name, last name, and profile photo URL
Determine user's administrator status
Generate a default profile photo URL based on the username using Gravatar's service

UserAddCallback

Responsibilities	Collaborators
Handle successful user add operation
Handle error during user add operation

UserController

Responsibilities	Collaborators
Manage user data interactions with Firestore database	User
Add a new user to the Firestore database and store a local copy	FileOutputStream, DocumentReference
Update an existing user's details in the Firestore database and update the local copy	ObjectOutputStream, Map
Fetch a user's details from the Firestore database or retrieve a local copy if not found	Context, FileInputStream, DocumentSnapshot
Check if a username already exists in the Firestore database	FirebaseFirestore, DocumentReference
Retrieve the stored username from internal storage	ObjectInputStream, Context

UserFetchCallback

Responsibilities	Collaborators
Handle success callback for user fetch operations	User
Handle error callback for user fetch operations	Exception

UsernameCheckCallback

Responsibilities	Collaborators
Handle username taken status callback	boolean
Handle error callback for username check operations	Exception

UserUpdateCallback

Responsibilities	Collaborators
Handle success callback for user updates	Exception
Handle error callback for user updates