LiveFootballWorldCupScoreBoard

Requirements:

• World Cup Scoreboard library
• shows all the ongoing matches and their scores

The scoreboard supports the following operations:

1. Start a new game, assuming initial score 0 � 0 and adding it the scoreboard. This should capture following parameters: a. Home team b. Away team
2. Update score. This should receive a pair of absolute scores: home team score and away team score.
3. Finish game currently in progress. This removes a match from the scoreboard.
4. Get a summary of games in progress ordered by their total score. The games with the same total score will be returned ordered by the most recently started match in the scoreboard.

Assumptions

• I will create a simple solution, my goal is to work time-boxed
• I will create 2 projects
  • Library - Domain logic (probably 2 classes: Game and Scoreboard)
  • Test - Unit Tests for Library
• I will document here my considerations

Implementation - Game

• I assume that you can not start a game, which two teams with same name play in (case insensitive)
• I use string for teams (which can be called a code smell [primitive obsession], but there is requirement to keep the solution simple)
• I assume you are allowed to change score by more then one score at once
  • e.g. you can go from 0:0 to 3:2 in one step
  • this makes sense in situations, when some SetScore commands 'get lost' on the way
  • I assume to update the score with the most up to date score
• I assume it is possible to go down with the score (3:3 to 1:1) e.g. because of some referee's decision
• I assume score cannot be negative
• I assume you cannot update score for a finished game

Implementation - Scoreboard

• I used a List to store Games, as suggested in the task description
• I used soft delete for 'finishing a game' - so it will grow infinitely, which is probably bad for an in memory collection in real life scenario, but would we use an in memory collection in real world scenario? - alternative would be to remove a game from the list
• in real life I would probably provide some method to add the scoreboard to the DI container, it would force me use interface, at least for the Scoreboard class
• Scoreboard class is not thread-safe, it can cause problems in a multi-threaded application
• Before starting I was considering splitting the read and write models (e.g. separate list for adding and editing games and separate list for querying the data which would be updated via events), but I wouldn't have enough time and the solution was supposed to be as simple as possible, so I didn't go for it.