drafting C# implementation

.gitignore

@@ -1,7 +1,10 @@
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##
-## Get latest from https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
+## Get latest from `dotnet new gitignore`
+
+# dotenv files
+.env
 
 # User-specific files
 *.rsuser
@@ -57,11 +60,14 @@ dlldata.c
 # Benchmark Results
 BenchmarkDotNet.Artifacts/
 
-# .NET Core
+# .NET
 project.lock.json
 project.fragment.lock.json
 artifacts/
 
+# Tye
+.tye/
+
 # ASP.NET Scaffolding
 ScaffoldingReadMe.txt
 
@@ -396,3 +402,83 @@ FodyWeavers.xsd
 
 # JetBrains Rider
 *.sln.iml
+.idea
+
+##
+## Visual studio for Mac
+##
+
+
+# globs
+Makefile.in
+*.userprefs
+*.usertasks
+config.make
+config.status
+aclocal.m4
+install-sh
+autom4te.cache/
+*.tar.gz
+tarballs/
+test-results/
+
+# Mac bundle stuff
+*.dmg
+*.app
+
+# content below from: https://github.com/github/gitignore/blob/master/Global/macOS.gitignore
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# content below from: https://github.com/github/gitignore/blob/master/Global/Windows.gitignore
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# Vim temporary swap files
+*.swp

CodeCave.CredyCard.sln

@@ -0,0 +1,30 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34321.82
+MinimumVisualStudioVersion = 10.0.40219.1'
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{E034D940-89F7-4DF9-9F1C-A723F163E5BB}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+	EndProjectSection
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CodeCave.CredyCard", "src\CodeCave.CredyCard.csproj", "{FC8BD8F5-5ECA-432A-85FE-2292A6E0E4E9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FC8BD8F5-5ECA-432A-85FE-2292A6E0E4E9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FC8BD8F5-5ECA-432A-85FE-2292A6E0E4E9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FC8BD8F5-5ECA-432A-85FE-2292A6E0E4E9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FC8BD8F5-5ECA-432A-85FE-2292A6E0E4E9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E8D4B4FF-527A-46C8-B5CA-0F1373C8E145}
+	EndGlobalSection
+EndGlobal

src/CardInfo.cs

@@ -0,0 +1,10 @@
+namespace CodeCave.CredyCard;
+
+public abstract class CardInfo
+{
+    public CardType Type { get; internal set; }
+
+    public long Number { get; internal set; }
+
+    public string NumberFormatted => string.Format("{0:0000 0000 0000 0000}", Number);
+}

src/CardType.cs

@@ -0,0 +1,82 @@
+namespace CodeCave.CredyCard;
+
+public class CardType
+{
+    private CardType()
+    {
+
+    }
+
+    public bool IsCreditCard { get; private set; }
+
+    public bool IsDebitCard => !IsCreditCard;
+
+    public string[] VendorCodes { get; private set; }
+
+    public string VendorCode => VendorCodes?.FirstOrDefault();
+
+    public string[] VendorNames { get; private set; }
+
+    public string VendorName => VendorNames?.FirstOrDefault();
+
+    public int RequiredLength { get; private set; }
+
+    private void ParseNumber(long cardNumber)
+    {
+        RequiredLength = 16;
+
+        switch (cardNumber)
+        {
+            case var visa when cardNumber.IsVisaCardNumber():
+                VendorCodes = ["VISA"];
+                VendorNames = ["Visa"];
+                break;
+
+            case var mastercard when cardNumber.IsMastercardNumber():
+                VendorCodes = ["MAST"];
+                VendorNames = ["Mastercard"];
+                break;
+
+            case var maestro when cardNumber.IsMaestroCardNumber():
+                VendorCodes = ["MAES"];
+                VendorNames = ["Maestro"];
+                break;
+
+            case var amex when cardNumber.IsAmexCardNumber():
+                VendorCodes = ["AMEX"];
+                VendorNames = ["American Express"];
+                break;
+
+            case var maestro when cardNumber.IsDinersCardNumber():
+                VendorCodes = ["DINR"];
+                VendorNames = ["Diners"];
+                break;
+
+            default:
+                VendorCodes = ["N/A"];
+                VendorNames = ["Unknown"];
+                break;
+        }
+    }
+
+    public static CardType Parse(long cardNumber)
+    {
+        var cardType = new CardType();
+        cardType.ParseNumber(cardNumber);
+        return cardType;
+    }
+
+    public static bool TryParse(long cardNumber, out CardType cardType)
+    {
+        try
+        {
+            cardType = Parse(cardNumber);
+            return true;
+        }
+        catch
+        {
+            cardType = default;
+            return false;
+        }
+    }
+}

src/CodeCave.CredyCard.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+  </PropertyGroup>
+
+</Project>

src/Extensions/LongExtensions.cs

@@ -0,0 +1,34 @@
+namespace System;
+
+public static class LongExtensions
+{
+	public static bool IsVisaCardNumber(this long cardNumber)
+	{
+		// TODO detect
+		return true;
+	}
+
+    public static bool IsMastercardNumber(this long cardNumber)
+    {
+        // TODO detect
+        return true;
+    }
+
+    public static bool IsMaestroCardNumber(this long cardNumber)
+    {
+        // TODO detect
+        return true;
+    }
+
+    public static bool IsAmexCardNumber(this long cardNumber)
+    {
+        // TODO detect
+        return true;
+    }
+
+    public static bool IsDinersCardNumber(this long cardNumber)
+    {
+        // TODO detect
+        return true;
+    }
+}