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Get-ChildItem -Path $PSScriptroot -Recurse -Force -Include '.vs', '.git', 'bin', 'obj', '.idea', '*.Dotsettings', '*.Dotsettings.user' | ForEach-Object {
Remove-Item -Recurse -Force -LiteralPath $_.FullName >$null
}

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Id;NickName;Date;Score
1 Id NickName Date Score

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Id;NickName;Date;Score
-3;Annihilator;2021-06-24T02:43:28;2478
85;Iron-Cut;2022-08-07T14:43:28;1013
27;Digital;2022-07-26T05:43:28;6828
27;Digital;2022-04-15T17:43:28;119
42;;2021-05-21T03:43:28;9244
1 Id NickName Date Score
2 -3 Annihilator 2021-06-24T02:43:28 2478
3 85 Iron-Cut 2022-08-07T14:43:28 1013
4 27 Digital 2022-07-26T05:43:28 6828
5 27 Digital 2022-04-15T17:43:28 119
6 42 2021-05-21T03:43:28 9244

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Id;NickName;Date;Score
3;Annihilator;2021-06-24T02:43:28;2478
85;Iron-Cut;2022-08-07T14:43:28;1013
27;Digital;2022-07-26T05:43:28;6828
27;Digital;2022-04-15T17:43:28;119
42;Harry Dotter;2021-05-21T03:43:28;9244
1 Id NickName Date Score
2 3 Annihilator 2021-06-24T02:43:28 2478
3 85 Iron-Cut 2022-08-07T14:43:28 1013
4 27 Digital 2022-07-26T05:43:28 6828
5 27 Digital 2022-04-15T17:43:28 119
6 42 Harry Dotter 2021-05-21T03:43:28 9244

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
<IsPackable>false</IsPackable>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="FluentAssertions" Version="6.12.0" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
<PackageReference Include="xunit" Version="2.9.0" />
<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
<PackageReference Include="coverlet.collector" Version="6.0.2">
<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
<PrivateAssets>all</PrivateAssets>
</PackageReference>
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\Highscore\Highscore.csproj" />
</ItemGroup>
<ItemGroup>
<None Update="Data\empty_01.csv">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="Data\empty_02.csv">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="Data\invalid.csv">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="Data\valid.csv">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
</ItemGroup>
</Project>

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using FluentAssertions;
using Xunit;
namespace Highscore.Test;
public sealed class HighscoreProcessingTests
{
[Fact]
public void TrimArray_Simple()
{
GameScore?[] scores =
[
new(new Player(1, "Test"), 23, DateTime.Now),
new(new Player(1, "Test"), 32, DateTime.Now.AddDays(-1)), null
];
HighscoreProcessing.TrimArray(scores)
.Should().NotBeNull()
.And.NotBeEmpty().And.HaveCount(2)
.And.ContainInOrder([scores[0]!, scores[1]!], "the two not null elements");
}
[Fact]
public void TrimArray_Gap()
{
GameScore?[] scores =
[
new(new Player(1, "Test"), 23, DateTime.Now),
null, new(new Player(1, "Test"), 32, DateTime.Now.AddDays(-1))
];
HighscoreProcessing.TrimArray(scores)
.Should().NotBeNull()
.And.NotBeEmpty().And.HaveCount(2)
.And.ContainInOrder([scores[0]!, scores[2]!], "the two not null elements");
}
[Fact]
public void TrimArray_EndOnly()
{
GameScore?[] scores = [null, null, new(new Player(1, "Test"), 32, DateTime.Now.AddDays(-1))];
HighscoreProcessing.TrimArray(scores)
.Should().NotBeNull()
.And.NotBeEmpty().And.HaveCount(1)
.And.ContainInOrder([scores[2]!], "the one not null elements");
}
[Fact]
public void TrimArray_Empty01()
{
var emptyArrayRef = Array.Empty<GameScore>();
HighscoreProcessing.TrimArray(emptyArrayRef)
.Should().NotBeNull()
.And.BeSameAs(emptyArrayRef);
}
[Fact]
public void TrimArray_Empty02()
{
HighscoreProcessing.TrimArray(new GameScore?[10])
.Should().NotBeNull()
.And.HaveCount(0, "only null elements in passed array")
.And.BeSameAs(Array.Empty<GameScore>());
}
[Fact]
public void SortGameScores_Simple()
{
GameScore[] scores =
[
new(new Player(1, "Test1"), 23, DateTime.Now),
new(new Player(2, "Test2"), 32, DateTime.Now),
new(new Player(3, "Test3"), 24, DateTime.Now)
];
var copy = (GameScore[])scores.Clone();
HighscoreProcessing.SortGameScores(scores);
scores.Should()
.NotBeNullOrEmpty().And.HaveCount(3, "no items are removed or added")
.And.ContainInOrder([copy[1], copy[2], copy[0]], "sorted by score");
}
[Fact]
public void SortGameScores_DateSort()
{
GameScore[] scores =
[
new(new Player(1, "Test1"), 32, DateTime.Now),
new(new Player(1, "Test1"), 32, DateTime.Now.AddDays(-1)),
new(new Player(3, "Test3"), 24, DateTime.Now)
];
var copy = (GameScore[])scores.Clone();
HighscoreProcessing.SortGameScores(scores);
scores.Should()
.NotBeNullOrEmpty().And.HaveCount(3, "no items are removed or added")
.And.ContainInOrder([copy[1], copy[0], copy[2]],
"sorted by score first, then by date, older entry wins");
}
[Fact]
public void FindBestScorePerUser_OneEntryPerUser()
{
GameScore[] scores =
[
new(new Player(1, "Test1"), 23, DateTime.Now),
new(new Player(2, "Test2"), 32, DateTime.Now),
new(new Player(3, "Test3"), 24, DateTime.Now)
];
HighscoreProcessing.FindBestScorePerUser(scores)
.Should().NotBeNullOrEmpty().And.HaveCount(3,
"three entries from three different users")
.And.Contain(scores);
}
[Fact]
public void FindBestScorePerUser_MultipleEntryPerUser()
{
GameScore[] scores =
[
new(new Player(1, "Test1"), 23, DateTime.Now),
new(new Player(1, "Test1"), 50, DateTime.Now.AddDays(-4)),
new(new Player(2, "Test2"), 32, DateTime.Now),
new(new Player(3, "Test3"), 24, DateTime.Now),
new(new Player(3, "Test3"), 12, DateTime.Now.AddDays(-2)),
new(new Player(4, "Test4"), 60, DateTime.Now),
new(new Player(4, "Test4"), 60, DateTime.Now.AddDays(-1))
];
HighscoreProcessing.FindBestScorePerUser((GameScore[]) scores.Clone())
.Should().NotBeNullOrEmpty().And.HaveCount(4,
"consolidated to one entry per user")
.And.Contain(new[] { scores[1], scores[2], scores[3], scores[6] },
"best result per user, earliest wins in case of equal score");
}
[Theory]
[MemberData(nameof(TryParseGameScoreData))]
public void TryParseGameScore(string line, bool expectedSuccess,
GameScore? expectedScore, string reason)
{
var result = HighscoreProcessing.TryParseGameScore(line, out var parsed);
result.Should().Be(expectedSuccess, reason);
if (expectedSuccess)
{
parsed.Should().NotBeNull()
.And.BeEquivalentTo(expectedScore, "expected parse result");
}
}
[Fact]
public void LoadScoresFromFile_Simple()
{
HighscoreProcessing.LoadScoresFromFile("Data/valid.csv")
.Should().NotBeNullOrEmpty()
.And.HaveCount(5, "one user can have multiple scores")
.And.Contain([
new GameScore(new Player(3, "Annihilator"), 2478, new DateTime(2021, 06, 24, 02, 43, 28)),
new GameScore(new Player(85, "Iron-Cut"), 1013, new DateTime(2022, 08, 07, 14, 43, 28)),
new GameScore(new Player(27, "Digital"), 6828, new DateTime(2022, 07, 26, 05, 43, 28)),
new GameScore(new Player(27, "Digital"), 119, new DateTime(2022, 04, 15, 17, 43, 28)),
new GameScore(new Player(42, "Harry Dotter"), 9244, new DateTime(2021, 05, 21, 03, 43, 28))
]);
}
[Fact]
public void LoadScoresFromFile_EmptyFile_01()
{
HighscoreProcessing.LoadScoresFromFile("Data/empty_01.csv")
.Should().NotBeNull("an array is always allocated")
.And.BeEmpty("file does not contain data")
.And.BeSameAs(Array.Empty<GameScore>(), "proper empty array creation");
}
[Fact]
public void LoadScoresFromFile_EmptyFile_02()
{
HighscoreProcessing.LoadScoresFromFile("Data/empty_02.csv")
.Should().NotBeNull("an array is always allocated")
.And.BeEmpty("file does not contain data")
.And.BeSameAs(Array.Empty<GameScore>(), "proper empty array creation");
}
[Fact]
public void LoadScoresFromFile_Invalid()
{
HighscoreProcessing.LoadScoresFromFile("Data/invalid.csv")
.Should().NotBeNullOrEmpty()
.And.HaveCount(3, "two entries are invalid")
.And.Contain([
new GameScore(new Player(85, "Iron-Cut"), 1013, new DateTime(2022, 08, 07, 14, 43, 28)),
new GameScore(new Player(27, "Digital"), 6828, new DateTime(2022, 07, 26, 05, 43, 28)),
new GameScore(new Player(27, "Digital"), 119, new DateTime(2022, 04, 15, 17, 43, 28))
], "invalid entries have been trimmed from final returned array");
}
[Fact]
public void LoadScoresFromFile_FileNotExists()
{
HighscoreProcessing.LoadScoresFromFile("Data/nope.csv")
.Should().NotBeNull("an array is always allocated")
.And.BeEmpty("file does not exist")
.And.BeSameAs(Array.Empty<GameScore>(), "proper empty array creation");
}
[Fact]
// console output not tested
public void WriteOutputFileAndPrint_Simple()
{
const string FilePath = "Data/output.csv";
if (File.Exists(FilePath))
{
File.Delete(FilePath);
}
HighscoreProcessing.WriteOutputFileAndPrint(outputTestScores, FilePath);
var lines = File.ReadAllLines(FilePath);
lines.Should().NotBeNullOrEmpty("valid file should have been created")
.And.HaveCount(4, "three data rows + header")
.And.ContainInOrder(outputExpectedLines, "output of passed scores in expected format");
}
[Fact]
// console output not tested
public void WriteOutputFileAndPrint_FileExists()
{
const string FilePath = "Data/output.csv";
File.WriteAllLines(FilePath, ["some", "content"]);
HighscoreProcessing.WriteOutputFileAndPrint(outputTestScores, FilePath);
var lines = File.ReadAllLines(FilePath);
lines.Should().NotBeNullOrEmpty("valid file should have been created despite one existing at that path")
.And.HaveCount(4, "three data rows + header")
.And.ContainInOrder(outputExpectedLines, "output of passed scores in expected format");
}
private static readonly GameScore[] outputTestScores =
[
new(new Player(27, "Digital"), 6828, new DateTime(2022, 07, 26, 05, 43, 28)),
new(new Player(3, "Annihilator"), 2478, new DateTime(2021, 06, 24, 02, 43, 28)),
new(new Player(85, "Iron-Cut"), 1013, new DateTime(2022, 08, 07, 14, 43, 28))
];
private static readonly string[] outputExpectedLines =
[
"Score;Date;Player",
"6828;26.07.2022;Digital (#27)",
"2478;24.06.2021;Annihilator (#3)",
"1013;07.08.2022;Iron-Cut (#85)"
];
public static TheoryData<string, bool, GameScore?, string> TryParseGameScoreData => new()
{
{
"12;Test;2022-08-16T19:33:56;589", true,
new GameScore(new Player(12, "Test"), 589,
new DateTime(2022, 08, 16, 19, 33, 56)),
"simple success case"
},
{
"Test;12;2022-08-16T19:33:56;589", false,
null, "wrong order"
},
{
"Test;2022-08-16T19:33:56;589", false,
null, "missing element"
},
{
"Test;12;2022-08-16T19:33:56;true;589", false,
null, "too many elements"
},
{
"12;Test;2022-16-08T19:33:56;589", false,
null, "invalid date"
},
{
"12;Test;2022-08-16T19:33:56;-589", false,
null, "invalid score"
},
{
"12;;2022-08-16T19:33:56;589", false,
null, "empty name"
},
{
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namespace Highscore;
/// <summary>
/// Processing of gamer scores to determine an overall highscore
/// </summary>
public static class HighscoreProcessing
{
private const char Separator = ';';
/// <summary>
/// Executes the <see cref="HighscoreProcessing"/> program.
/// </summary>
public static void Run()
{
var scores = LoadScoresFromFile("Data/scores.csv");
var bestScores = FindBestScorePerUser(scores);
SortGameScores(bestScores);
WriteOutputFileAndPrint(bestScores, "Data/highscore.csv");
}
/// <summary>
/// Writes the provided <see cref="GameScore"/> instances to a file at the supplied path.
/// The CSV format is Score;Date;Player.
/// </summary>
/// <param name="highscore">Game scores to persist</param>
/// <param name="filePath">Path to write to</param>
public static void WriteOutputFileAndPrint(GameScore[] highscore, string filePath)
{
// TODO
}
/// <summary>
/// Loads the CSV file at the supplied path and attempts to parse its content to
/// create an array of <see cref="GameScore"/> instances utilizing <see cref="TryParseGameScore"/>.
/// </summary>
/// <param name="filePath">Path to read from</param>
/// <returns>Array of parsed items; empty array if file does not exist or is empty</returns>
public static GameScore[] LoadScoresFromFile(string filePath)
{
// TODO
return [];
}
/// <summary>
/// Attempts to parse a CSV formatted string to a <see cref="GameScore"/> object.
/// </summary>
/// <param name="line">String to parse</param>
/// <param name="gameScore">Successfully parsed object; null if parsing fails</param>
/// <returns>True if parsed successfully; false otherwise</returns>
public static bool TryParseGameScore(string line, out GameScore? gameScore)
{
// TODO
gameScore = null;
return false;
}
/// <summary>
/// Based on the provided full set of game scores for each user the best score is determined.
/// If a user has two or more entries with the same score the oldest (earliest) entry is considered to
/// be the highest.
/// </summary>
/// <param name="allScores">Collection of all scores; may contain multiple entries for one user</param>
/// <returns>An array containing the highest score of each user, based on passed scores</returns>
public static GameScore[] FindBestScorePerUser(GameScore[] allScores)
{
// TODO
return [];
}
/// <summary>
/// Sorts the provided <see cref="GameScore"/> instances so that those with the
/// highest score (older date is preferred if score is equal) are ranked first.
/// Sorting happens in-place.
/// </summary>
/// <param name="scores">Scores to sort</param>
public static void SortGameScores(GameScore[] scores)
{
// TODO
}
/// <summary>
/// Trims empty (null) entries from the provided array.
/// </summary>
/// <param name="arrayToTrim">The array to process</param>
/// <returns>A new array containing only the non-null entries from the passed array</returns>
public static GameScore[] TrimArray(GameScore?[] arrayToTrim)
{
// TODO
return [];
}
}

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namespace Highscore;
public record Player(int Id, string NickName);
public record GameScore(Player Player, int Score, DateTime Date);

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Highscore/Program.cs Normal file
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using System.Text;
using Highscore;
Console.OutputEncoding = Encoding.UTF8;
Console.WriteLine($"*** Highscores ***{Environment.NewLine}");
HighscoreProcessing.Run();

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:sectnums:
:nofooter:
:toc: left
:icons: font
= Rep.02 -- Game Highscore
In this exercise you are going to process a lot of scores different gamers achieved in a challenging game.
You will determine a highscore: a list of each player's best result, sorted from the highest scorer to the least.
== File Descriptions
=== Input File
The input file(s) are CSV files.
One file can contain multiple score results from each user; on different dates.
* Format: `Id;NickName;Date;Score`.
* Sample: `9;CrazyBull;2021-07-22T14:43:28;2428`
=== Output File
The output is a CSV file which contains one entry for each user who provided at least one score in the input.
* Format: `Score;Date;Player`
* Sample: `1013;07.08.2022;Iron-Cut (#85)`
The output is sorted:
* Highest score first
* If two scores are equal the older (earlier) date 'wins'
== Task
Create an application which reads & parses the input file, consolidates and sorts the game scores and finally creates a CSV file containing the highscore.
Make sure you stick to the required formats of the files.
To make it easier for you the definitions of all required methods have already been provided with the starter code.
Implement those according to the specification to complete this exercise.
You may add additional methods if you deem them necessary.
NOTE: Use the `record` definitions provided in `Model.cs` and be aware that especially the output format will not map 1:1 to those data types, yet they contain all required information