Added PasswordSettings.WithDefaults

README.md

@@ -39,6 +39,15 @@ string password = generator.Generate(16);
 Console.WriteLine(password);  // Example output: kAj79uV@E?m7_8eS
 ```
 
+### Using WithDefaults
+Quickly generate a password using default pools:
+```csharp
+PasswordSettings settings = PasswordSettings.WithDefaults(minLower: 2, minUpper: 2, minDigits: 2, minSpecial: 1);
+PasswordGenerator generator = new(settings);
+
+string password = generator.Generate(12);
+```
+
 ## Additional Methods
 
 ### `GenerateRandomLength(int minPasswordLength, int maxPasswordLength)`

src/KPasswordGenerator.Tests/PasswordSettingsTests.cs

@@ -0,0 +1,46 @@
+namespace KPasswordGenerator.Tests;
+
+public class PasswordSettingsTests
+{
+    [Fact]
+    public void WithDefaults_UsesExpectedDefaults()
+    {
+        var settings = PasswordSettings.WithDefaults();
+
+        Assert.Equal(4, settings.CharacterRequirements.Count);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == 1 && r.CharacterPool == CharacterPools.LowerCase);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == 1 && r.CharacterPool == CharacterPools.UpperCase);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == 1 && r.CharacterPool == CharacterPools.Digits);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == 1 && r.CharacterPool == CharacterPools.Special);
+    }
+
+    [Fact]
+    public void WithDefaults_AllZero_ReturnsEmptyRequirements()
+    {
+        var settings = PasswordSettings.WithDefaults(0, 0, 0, 0);
+
+        Assert.Empty(settings.CharacterRequirements);
+    }
+
+    [Fact]
+    public void WithDefaults_CreatesRequirementsWithCorrectValues()
+    {
+        int lower = 2, upper = 3, digits = 4, special = 5;
+
+        var settings = PasswordSettings.WithDefaults(lower, upper, digits, special);
+
+        Assert.Equal(4, settings.CharacterRequirements.Count);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == lower && r.CharacterPool == CharacterPools.LowerCase);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == upper && r.CharacterPool == CharacterPools.UpperCase);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == digits && r.CharacterPool == CharacterPools.Digits);
+        Assert.Contains(settings.CharacterRequirements, r =>
+            r.MinRequired == special && r.CharacterPool == CharacterPools.Special);
+    }
+}

src/KPasswordGenerator/CharacterPools.cs

@@ -6,5 +6,7 @@ public static class CharacterPools
 
     public const string UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
+    public const string Digits = "0123456789";
+
     public const string Special = " !\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
 }

src/KPasswordGenerator/PasswordGenerator.cs

@@ -1,4 +1,4 @@
-using System.Security.Cryptography;
+using System.Security.Cryptography;
 
 namespace KPasswordGenerator;
 
@@ -53,9 +53,17 @@ public bool Validate(string password)
 
         foreach (var requirement in _passwordSettings.CharacterRequirements)
         {
-            int count = password.Count(requirement.CharacterPool.Contains);
+            int count = 0;
 
-            if (count < requirement.MinRequired) return false;
+            for (int i = 0; i < password.Length && count < requirement.MinRequired; i++)
+            {
+                if (requirement.CharacterPool.Contains(password[i]))
+                {
+                    count++;
+                }
+            }
+
+            if (count != requirement.MinRequired) return false;
         }
 
         return true;

src/KPasswordGenerator/PasswordSettings.cs

@@ -16,4 +16,23 @@ public PasswordSettings(ICollection<CharacterRequirement> characterRequirements)
     }
 
     public ICollection<CharacterRequirement> CharacterRequirements { get; }
+
+    public static PasswordSettings WithDefaults(int minLower = 1, int minUpper = 1, int minDigits = 1, int minSpecial = 1)
+    {
+        List<CharacterRequirement> requirements = [];
+
+        if (minLower > 0)
+            requirements.Add(new CharacterRequirement(minLower, CharacterPools.LowerCase));
+
+        if (minUpper > 0)
+            requirements.Add(new CharacterRequirement(minUpper, CharacterPools.UpperCase));
+
+        if (minDigits > 0)
+            requirements.Add(new CharacterRequirement(minDigits, CharacterPools.Digits));
+
+        if (minSpecial > 0)
+            requirements.Add(new CharacterRequirement(minSpecial, CharacterPools.Special));
+
+        return new PasswordSettings(requirements);
+    }
 }