sql-utilities/tests/Strata.SqlTools.Markdown.Tests/LinqToSql/SqlStatementGeneratorTests.cs

using Strata.SqlTools.Markdown.LinqToSql;
using Strata.SqlTools.Breakdowns.LinqToSql;

namespace Strata.SqlTools.Markdown.Tests.LinqToSql;

[TestFixture]
public class SqlStatementGeneratorTests
{
    private SqlStatementGenerator _generator = null!;

    [SetUp]
    public void Setup()
    {
        _generator = new SqlStatementGenerator();
    }

    [Test]
    public void GenerateLinqPipelineDiagram_BasicQuery_GeneratesSequenceDiagram()
    {
        // Arrange
        var query = new LinqQueryBreakdown("*", "Users");

        // Act
        var result = SqlStatementGenerator.GenerateLinqPipelineDiagram(query, "User Query Pipeline");

        // Assert
        Assert.That(result, Does.Contain("```mermaid"));
        Assert.That(result, Does.Contain("sequenceDiagram"));
        Assert.That(result, Does.Contain("### User Query Pipeline"));
        Assert.That(result, Does.Contain("LINQ Provider"));
        Assert.That(result, Does.Contain("Expression Tree"));
        Assert.That(result, Does.Contain("SQL Generator"));
        Assert.That(result, Does.Contain("Database"));
        Assert.That(result, Does.Contain("```"));
    }

    [Test]
    public void GenerateLinqPipelineDiagram_WithWhere_ShowsPredicateProcessing()
    {
        // Arrange
        var query = new LinqQueryBreakdown("Id, Name", "Users");
        query.AddWhereClause("Age > 21");

        // Act
        var result = SqlStatementGenerator.GenerateLinqPipelineDiagram(query);

        // Assert
        Assert.That(result, Does.Contain("Where Predicate"));
        Assert.That(result, Does.Contain("Expression Tree"));
        Assert.That(result, Does.Contain("SQL Generator"));
    }

    [Test]
    public void GenerateLinqPipelineDiagram_WithProjection_ShowsSelectProcessing()
    {
        // Arrange
        var query = new LinqQueryBreakdown("Id, Name, Email", "Users");

        // Act
        var result = SqlStatementGenerator.GenerateLinqPipelineDiagram(query);

        // Assert
        Assert.That(result, Does.Contain("Select Projection"));
        Assert.That(result, Does.Contain("LINQ Provider"));
        Assert.That(result, Does.Contain("Database"));
    }

    [Test]
    public void GenerateLinqPipelineDiagram_NullTitle_GeneratesWithoutTitle()
    {
        // Arrange
        var query = new LinqQueryBreakdown("*", "Users");

        // Act
        var result = SqlStatementGenerator.GenerateLinqPipelineDiagram(query, null);

        // Assert
        Assert.That(result, Does.Not.Contain("###"));
        Assert.That(result, Does.Contain("```mermaid"));
        Assert.That(result, Does.Contain("sequenceDiagram"));
    }

    [Test]
    public void GenerateSequenceDiagram_DelegatesToBaseClass()
    {
        // Arrange
        var query = new LinqQueryBreakdown("*", "Users");

        // Act
        var result = _generator.GenerateSequenceDiagram(query, "Sequence Test");

        // Assert
        Assert.That(result, Does.Contain("```mermaid"));
        Assert.That(result, Does.Contain("sequenceDiagram"));
        Assert.That(result, Does.Contain("### Sequence Test"));
    }

    [Test]
    public void GenerateEntityRelationshipDiagram_DelegatesToBaseClass()
    {
        // Arrange
        var query = new LinqQueryBreakdown("Id, Name", "Users");

        // Act
        var result = _generator.GenerateEntityRelationshipDiagram(query, "ER Test");

        // Assert
        Assert.That(result, Does.Contain("```mermaid"));
        Assert.That(result, Does.Contain("erDiagram"));
        Assert.That(result, Does.Contain("### ER Test"));
    }
}