A high-level overview of the main classes and their responsibilities in the QR code hunting app using CRC cards.

QRCodeScanner

Responsibilities	Collaborators
Scan and recognize QR codes and barcodes	PlayerAccount
Hash the scanned code and score it based on a scoring system	ScoringSystem
Take a photo of the scanned object	Map
Record geolocation of the scanned code
Add the score and the hash of the scanned code to the player's account

QRCode

Responsibilities	Collaborators
Contains a Hash object, photo with geolocation, and name of the QRCode	Scanner
Stores the players who scanned it	Player
Stores the photo with geolocation	Photo
	Hash

Hash

Responsibilities	Collaborators
Contains hashed string	QRCode
Calculates score from hashed string based on some rule

Photo

Responsibilies	Collaborators
Stores geolocation of the QR Code internally	QRCode
Shows the whereabouts of the QR Code	Scanner

Player

PlayerAccount

Responsibilities	Collaborators
Store player's information, including the total score, scanned QR codes, and photos	QRCodeScanner
Store the hash of the scanned QR codes to avoid duplicates	Map
Provide a summary of the player's activity, including the highest-scoring QR codes, the number of QR codes, and the total score

PlayersDB

Responsibilities	Collaborators
Maintaining player entities	PlayerAccount
Performing actions: edit, delete player info etc	PlayerDBConnector

PlayerDBConnector

Responsibilities	Collaborators
Connects to the Firebase Firestore database	PlayerDB

Scoring

ScoringSystem

Responsibilities	Collaborators
Score the QR codes based on certain properties like hex digits	QRCodeScanner
Provide a score for each scanned QR code	PlayerAccount
Store a record of the scores of all scanned QR codes

ScoreDB

Responsibilities	Collaborators
Maintains the score of a particular player in DB	ScoringSystem
	ScoreDBConnector

ScoreDBConnector

Responsibilities	Collaborators
Connects to the Firebase Firestore database	ScoreDB

Map

Responsibilities	Collaborators
Show the location of the scanned QR codes on a map	PlayerAccount
Show other players' activity, including their scanned QR codes and photos	Photo
Allow players to search for QR codes in a certain region