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OrbitalMap.cs
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OrbitalMap.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class OrbitalMap
{
public Planet com { get; set; }
public Dictionary<string, Planet> AllPlanets;
public int totalOrbits = 0;
public string MapFile { get; set; }
public OrbitalMap(string mapFile)
{
AllPlanets = new Dictionary<string, Planet>();
MapFile = mapFile;
com = new Planet("COM");
AllPlanets.Add(com.Name, com);
PopulateMapFromFile();
totalOrbits = com.CalculateDistances( totalOrbits );
}
public void PopulateMapFromFile()
{
String line;
try
{
//Pass the file path and file Name to the StreamReader constructor
StreamReader sr = new StreamReader(MapFile);
//Continue to read until you reach end of file
while (!sr.EndOfStream)
{
line = sr.ReadLine();
var components = line.Split(')');
var orbittedName = components[0];
Planet orbittedPlanet;
var orbitingName = components[1];
Planet orbitingPlanet;
AllPlanets.TryGetValue(orbittedName, out orbittedPlanet);
if (orbittedPlanet == null)
{
orbittedPlanet = new Planet(orbittedName);
AllPlanets.Add(orbittedPlanet.Name, orbittedPlanet);
}
AllPlanets.TryGetValue(orbitingName, out orbitingPlanet);
if (orbitingPlanet == null)
{
orbitingPlanet = new Planet(orbitingName);
AllPlanets.Add(orbitingPlanet.Name, orbitingPlanet);
}
orbittedPlanet.AddOrbitedBy(orbitingPlanet);
}
//close the file
sr.Close();
}
catch(Exception e)
{
Console.WriteLine("Exception: " + e.Message);
}
finally
{
Console.WriteLine("Executing finally block.");
}
}
public int GetOrbitalTransfersBetween(string pointOneName, string pointTwoName)
{
Planet pointOnePlanet;
Planet pointTwoPlanet;
Planet comPlanet;
AllPlanets.TryGetValue(pointOneName, out pointOnePlanet);
AllPlanets.TryGetValue(pointTwoName, out pointTwoPlanet);
AllPlanets.TryGetValue("COM", out comPlanet);
var pathOne = pointOnePlanet.GetPathTo(comPlanet);
var pathTwo = pointTwoPlanet.GetPathTo(comPlanet);
var crossOverPlanet = GetCrossOverPlanet(pathOne, pathTwo);
return (pointOnePlanet.InOrbitAround.totalOrbiting - crossOverPlanet.totalOrbiting)
+ (pointTwoPlanet.InOrbitAround.totalOrbiting - crossOverPlanet.totalOrbiting);
}
private Planet GetCrossOverPlanet(
Dictionary<string, Planet> pathOne,
Dictionary<string, Planet> pathTwo)
{
var crossOvers = new List<Planet>();
foreach(var p1 in pathOne)
{
if(pathTwo.ContainsKey(p1.Key))
{
crossOvers.Add(p1.Value);
}
}
crossOvers.OrderBy(p => p.totalOrbiting);
return crossOvers.FirstOrDefault();
}
}
class Planet
{
public string Name { get; set; }
public List<Planet> OrbitedBy { get; set; }
public Planet InOrbitAround { get; set; }
public int directlyOrbiting { get; set; } = 0;
public int totalOrbiting { get; set; } = 0;
public Planet(string Name)
{
OrbitedBy = new List<Planet>();
this.Name = Name;
}
public Dictionary<string, Planet> GetPathTo(Planet destination)
{
var path = new Dictionary<string, Planet>();
path.Add(this.Name, this);
if (this == destination)
{
return path;
}
var subPath = InOrbitAround.GetPathTo(destination);
foreach(var p in subPath)
{
path.Add(p.Key, p.Value);
}
return path;
}
public int CalculateDistances(int total)
{
total = totalOrbiting = InOrbitAround == null ? 0 : InOrbitAround.totalOrbiting + 1;
directlyOrbiting = InOrbitAround == null ? 0 : 1;
foreach(var planet in OrbitedBy)
{
total += planet.CalculateDistances(total);
}
return total;
}
public void SetInOrbit(Planet inOrbitAround)
{
InOrbitAround = inOrbitAround;
}
public void AddOrbitedBy(Planet orbitedBy)
{
OrbitedBy.Add(orbitedBy);
orbitedBy.SetInOrbit(this);
}
}