mrfishchev / aihr-universe

Aihr Universe

The project shows, how to organise SolarSystem structure.

Note!
Some of the task's requirements I decided to implement in my own way, I put them into Assumptions section.

Get Started

1. Open the solution and press Run (tested with Rider).
2. You will see all the necessary structure in a console.

Warning!
Not the whole information is printed in a console.

Assumptions

Topic	Comment
Celestial Bodies	Not all the types are presented: Stars, Planets, Satellites, DwarfPlanets only. There are no Comets, Asteroids, and Meteors.
Satellites	In a context of this project - it's a natural object of Solar System, which are not made by human (e.g. only Moons are here).
Satellites Limit	Maximum amount of satellites for any object is 2 (sorry, but too much googling for parameters).
Terraformed Bodies	In a context of this project I didn't put ITerraformed interface to any satellite, only for planets, no sense to do it, no logic in the requirements.
Orbital Period	Represents days without too specific hours (e.g. 0.25 days, not like 0.234141251 days), if you are interested how I work with big numbers, look at the Mass class.
Linked Objects	Now I have one-directional linked list (Planet -> Satellite), but better to have Planet <-> Satellite that will allow any Satellite to find its planet.
Nullable Properties	There are nullable or open to be set properties, as we have missing information for some of the celestial bodies, or even we not fully opened amount of planets in the system (e.g. Planet X)
Distances	Better to have not a distance between Sun and Object, or Parent and Object, but a coordinates to calculate vector if needed
Colonize	Better do not have any logic in extension methods, instead we need to CanColonize method and move all the business logic to a separate Colonizer service (but it too many time already here), see SRP - Single Responsibility Principle

Perfect === Good Enough

Note!
Implement an interface for all celestial bodies that "Can sustain life", "Can be terraformed", and "Has satellite moon(s)" and an extension method named Colonize().

There is no sense to implement these interfaces for all the Celestial Bodies, much better to add it to specific objects, like Mars or Venus. Also, HasSatelliteMoons interface will violate OCP - Open-Closed Principle, so I decided to do extension method, that will work without manual changes in case of adding new celestial bodies 👍.

ILifeSustainable - Can sustainn life interface
ITerraformed - Can be terraformed (yeah yeah, thats, difficult to follow correct names)
HasSatellitesMoons - Extension method for Planet type.