// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
#nullable disable
 
using System;
using Xunit;
 
namespace Microsoft.AspNetCore.Razor.Language;
 
public class DirectiveDescriptorTest
{
    [Fact]
    public void CreateDirective_CreatesDirective_WithProvidedKind()
    {
        // Arrange & Act
        var directive = DirectiveDescriptor.CreateDirective("test", DirectiveKind.SingleLine);
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.SingleLine, directive.Kind);
    }
 
    [Fact]
    public void CreateDirective_WithConfigure_CreatesDirective_WithProvidedKind()
    {
        // Arrange
        var called = false;
        Action<IDirectiveDescriptorBuilder> configure = b => { called = true; };
 
        // Act
        var directive = DirectiveDescriptor.CreateDirective("test", DirectiveKind.SingleLine, configure);
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.SingleLine, directive.Kind);
        Assert.True(called);
    }
 
    [Fact]
    public void CreateSingleLineDirective_CreatesSingleLineDirective()
    {
        // Arrange & Act
        var directive = DirectiveDescriptor.CreateSingleLineDirective("test");
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.SingleLine, directive.Kind);
    }
 
    [Fact]
    public void CreateSingleLineDirective_WithConfigure_CreatesSingleLineDirective()
    {
        // Arrange
        var called = false;
        Action<IDirectiveDescriptorBuilder> configure = b => { called = true; };
 
        // Act
        var directive = DirectiveDescriptor.CreateSingleLineDirective("test", configure);
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.SingleLine, directive.Kind);
        Assert.True(called);
    }
 
    [Fact]
    public void CreateRazorBlockDirective_CreatesRazorBlockDirective()
    {
        // Arrange & Act
        var directive = DirectiveDescriptor.CreateRazorBlockDirective("test");
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.RazorBlock, directive.Kind);
    }
 
    [Fact]
    public void CreateRazorBlockDirective_WithConfigure_CreatesRazorBlockDirective()
    {
        // Arrange
        var called = false;
        Action<IDirectiveDescriptorBuilder> configure = b => { called = true; };
 
        // Act
        var directive = DirectiveDescriptor.CreateRazorBlockDirective("test", configure);
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.RazorBlock, directive.Kind);
        Assert.True(called);
    }
 
    [Fact]
    public void CreateCodeBlockDirective_CreatesCodeBlockDirective()
    {
        // Arrange & Act
        var directive = DirectiveDescriptor.CreateCodeBlockDirective("test");
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.CodeBlock, directive.Kind);
    }
 
    [Fact]
    public void CreateCodeBlockDirective_WithConfigure_CreatesCodeBlockDirective()
    {
        // Arrange
        var called = false;
        Action<IDirectiveDescriptorBuilder> configure = b => { called = true; };
 
        // Act
        var directive = DirectiveDescriptor.CreateCodeBlockDirective("test", configure);
 
        // Assert
        Assert.Equal("test", directive.Directive);
        Assert.Equal(DirectiveKind.CodeBlock, directive.Kind);
        Assert.True(called);
    }
 
    [Fact]
    public void Build_ValidatesDirectiveKeyword_EmptyIsInvalid()
    {
        // Arrange & Act
        var ex = Assert.Throws<InvalidOperationException>(() => DirectiveDescriptor.CreateSingleLineDirective(""));
 
        // Assert
        Assert.Equal("Invalid directive keyword ''. Directives must have a non-empty keyword that consists only of letters.", ex.Message);
    }
 
    [Fact]
    public void Build_ValidatesDirectiveKeyword_InvalidCharacter()
    {
        // Arrange & Act
        var ex = Assert.Throws<InvalidOperationException>(() => DirectiveDescriptor.CreateSingleLineDirective("test_directive"));
 
        // Assert
        Assert.Equal("Invalid directive keyword 'test_directive'. Directives must have a non-empty keyword that consists only of letters.", ex.Message);
    }
 
    [Fact]
    public void Build_ValidatesDirectiveName_NonOptionalTokenFollowsOptionalToken()
    {
        // Arrange & Act
        var ex = Assert.Throws<InvalidOperationException>(
            () => DirectiveDescriptor.CreateSingleLineDirective("test", b => { b.AddOptionalMemberToken(); b.AddMemberToken(); }));
 
        // Assert
        Assert.Equal("A non-optional directive token cannot follow an optional directive token.", ex.Message);
    }
}