using CeresSharp;
using CeresSharp.Enums;

namespace CeresSharp.Test;

/// <summary>
/// Simple test to isolate crash issue
/// </summary>
[TestFixture]
public class SimpleTest
{
    [Test]
    public void SimpleProblemTest()
    {
        using var problem = new Problem();
        var x = new double[] { 0.0 };
        problem.AddParameterBlock(x, x.Length);
        
        var costFunction = new AutoDiffCostFunction(
            (parameters, residuals) =>
            {
                residuals[0] = parameters[0][0] - 2.0;
                return true;
            },
            numResiduals: 1,
            parameterBlockSizes: new[] { 1 });
        
        problem.AddResidualBlock(costFunction, lossFunction: null,
            parameterBlocks: new[] { x });
        
        using var options = new SolverOptions
        {
            LinearSolverType = LinearSolverType.DenseQr,
            MaxNumIterations = 50,
            FunctionTolerance = 1e-10
        };
        
        // Solve may fail for various reasons (e.g., initial evaluation failure)
        try
        {
            using var summary = problem.Solve(options);
            
            Assert.That(summary, Is.Not.Null);
            Console.WriteLine("Test completed successfully");
        }
        catch (Exceptions.CeresException ex)
        {
            // Expected for some problems - just verify it doesn't crash
            Console.WriteLine($"Solve failed (expected in some cases): {ex.Message}");
            Assert.Pass("Solve failed but didn't crash");
        }
        
        // Force GC to see if crash happens during finalization
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
    }
}